/* GStreamer
* Copyright (C) 2008 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
* Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstbaseparse
* @title: GstBaseParse
* @short_description: Base class for stream parsers
* @see_also: #GstBaseTransform
*
* This base class is for parser elements that process data and splits it
* into separate audio/video/whatever frames.
*
* It provides for:
*
* * provides one sink pad and one source pad
* * handles state changes
* * can operate in pull mode or push mode
* * handles seeking in both modes
* * handles events (SEGMENT/EOS/FLUSH)
* * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
* * handles flushing
*
* The purpose of this base class is to provide the basic functionality of
* a parser and share a lot of rather complex code.
*
* # Description of the parsing mechanism:
*
* ## Set-up phase
*
* * #GstBaseParse calls #GstBaseParseClass.start() to inform subclass
* that data processing is about to start now.
*
* * #GstBaseParse class calls #GstBaseParseClass.set_sink_caps() to
* inform the subclass about incoming sinkpad caps. Subclass could
* already set the srcpad caps accordingly, but this might be delayed
* until calling gst_base_parse_finish_frame() with a non-queued frame.
*
* * At least at this point subclass needs to tell the #GstBaseParse class
* how big data chunks it wants to receive (minimum frame size ). It can
* do this with gst_base_parse_set_min_frame_size().
*
* * #GstBaseParse class sets up appropriate data passing mode (pull/push)
* and starts to process the data.
*
* ## Parsing phase
*
* * #GstBaseParse gathers at least min_frame_size bytes of data either
* by pulling it from upstream or collecting buffers in an internal
* #GstAdapter.
*
* * A buffer of (at least) min_frame_size bytes is passed to subclass
* with #GstBaseParseClass.handle_frame(). Subclass checks the contents
* and can optionally return #GST_FLOW_OK along with an amount of data
* to be skipped to find a valid frame (which will result in a
* subsequent DISCONT). If, otherwise, the buffer does not hold a
* complete frame, #GstBaseParseClass.handle_frame() can merely return
* and will be called again when additional data is available. In push
* mode this amounts to an additional input buffer (thus minimal
* additional latency), in pull mode this amounts to some arbitrary
* reasonable buffer size increase.
*
* Of course, gst_base_parse_set_min_frame_size() could also be used if
* a very specific known amount of additional data is required. If,
* however, the buffer holds a complete valid frame, it can pass the
* size of this frame to gst_base_parse_finish_frame().
*
* If acting as a converter, it can also merely indicate consumed input
* data while simultaneously providing custom output data. Note that
* baseclass performs some processing (such as tracking overall consumed
* data rate versus duration) for each finished frame, but other state
* is only updated upon each call to #GstBaseParseClass.handle_frame()
* (such as tracking upstream input timestamp).
*
* Subclass is also responsible for setting the buffer metadata
* (e.g. buffer timestamp and duration, or keyframe if applicable).
* (although the latter can also be done by #GstBaseParse if it is
* appropriately configured, see below). Frame is provided with
* timestamp derived from upstream (as much as generally possible),
* duration obtained from configuration (see below), and offset
* if meaningful (in pull mode).
*
* Note that #GstBaseParseClass.handle_frame() might receive any small
* amount of input data when leftover data is being drained (e.g. at
* EOS).
*
* * As part of finish frame processing, just prior to actually pushing
* the buffer in question, it is passed to
* #GstBaseParseClass.pre_push_frame() which gives subclass yet one last
* chance to examine buffer metadata, or to send some custom (tag)
* events, or to perform custom (segment) filtering.
*
* * During the parsing process #GstBaseParseClass will handle both srcpad
* and sinkpad events. They will be passed to subclass if
* #GstBaseParseClass.event() or #GstBaseParseClass.src_event()
* implementations have been provided.
*
* ## Shutdown phase
*
* * #GstBaseParse class calls #GstBaseParseClass.stop() to inform the
* subclass that data parsing will be stopped.
*
* Subclass is responsible for providing pad template caps for source and
* sink pads. The pads need to be named "sink" and "src". It also needs to
* set the fixed caps on srcpad, when the format is ensured (e.g. when
* base class calls subclass' #GstBaseParseClass.set_sink_caps() function).
*
* This base class uses %GST_FORMAT_DEFAULT as a meaning of frames. So,
* subclass conversion routine needs to know that conversion from
* %GST_FORMAT_TIME to %GST_FORMAT_DEFAULT must return the
* frame number that can be found from the given byte position.
*
* #GstBaseParse uses subclasses conversion methods also for seeking (or
* otherwise uses its own default one, see also below).
*
* Subclass @start and @stop functions will be called to inform the beginning
* and end of data processing.
*
* Things that subclass need to take care of:
*
* * Provide pad templates
* * Fixate the source pad caps when appropriate
* * Inform base class how big data chunks should be retrieved. This is
* done with gst_base_parse_set_min_frame_size() function.
* * Examine data chunks passed to subclass with
* #GstBaseParseClass.handle_frame() and pass proper frame(s) to
* gst_base_parse_finish_frame(), and setting src pad caps and timestamps
* on frame.
* * Provide conversion functions
* * Update the duration information with gst_base_parse_set_duration()
* * Optionally passthrough using gst_base_parse_set_passthrough()
* * Configure various baseparse parameters using
* gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
* and gst_base_parse_set_frame_rate().
*
* * In particular, if subclass is unable to determine a duration, but
* parsing (or specs) yields a frames per seconds rate, then this can be
* provided to #GstBaseParse to enable it to cater for buffer time
* metadata (which will be taken from upstream as much as
* possible). Internally keeping track of frame durations and respective
* sizes that have been pushed provides #GstBaseParse with an estimated
* bitrate. A default #GstBaseParseClass.convert() (used if not
* overridden) will then use these rates to perform obvious conversions.
* These rates are also used to update (estimated) duration at regular
* frame intervals.
*
*/
/* TODO:
* - In push mode provide a queue of adapter-"queued" buffers for upstream
* buffer metadata
* - Queue buffers/events until caps are set
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <gst/base/gstadapter.h>
#include "gstbaseparse.h"
/* FIXME: get rid of old GstIndex code */
#include "gstindex.h"
#include "gstindex.c"
#include "gstmemindex.c"
#define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
#define MIN_FRAMES_TO_POST_BITRATE 10
#define TARGET_DIFFERENCE (20 * GST_SECOND)
#define MAX_INDEX_ENTRIES 4096
#define UPDATE_THRESHOLD 2
#define ABSDIFF(a,b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
#define GST_CAT_DEFAULT gst_base_parse_debug
/* Supported formats */
static const GstFormat fmtlist[] = {
GST_FORMAT_DEFAULT,
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
GST_FORMAT_UNDEFINED
};
struct _GstBaseParsePrivate
{
GstPadMode pad_mode;
GstAdapter *adapter;
gint64 duration;
GstFormat duration_fmt;
gint64 estimated_duration;
gint64 estimated_drift;
guint min_frame_size;
gboolean disable_passthrough;
gboolean passthrough;
gboolean pts_interpolate;
gboolean infer_ts;
gboolean syncable;
gboolean has_timing_info;
guint fps_num, fps_den;
gint update_interval;
guint bitrate;
guint lead_in, lead_out;
GstClockTime lead_in_ts, lead_out_ts;
GstClockTime min_latency, max_latency;
gboolean discont;
gboolean flushing;
gboolean drain;
gboolean saw_gaps;
gint64 offset;
gint64 sync_offset;
GstClockTime next_pts;
GstClockTime next_dts;
GstClockTime prev_pts;
GstClockTime prev_dts;
gboolean prev_dts_from_pts;
GstClockTime frame_duration;
gboolean seen_keyframe;
gboolean is_video;
gint flushed;
guint64 framecount;
guint64 bytecount;
guint64 data_bytecount;
guint64 acc_duration;
GstClockTime first_frame_pts;
GstClockTime first_frame_dts;
gint64 first_frame_offset;
gboolean post_min_bitrate;
gboolean post_avg_bitrate;
gboolean post_max_bitrate;
guint min_bitrate;
guint avg_bitrate;
guint max_bitrate;
guint posted_avg_bitrate;
/* frames/buffers that are queued and ready to go on OK */
GQueue queued_frames;
GstBuffer *cache;
/* index entry storage, either ours or provided */
GstIndex *index;
gint index_id;
gboolean own_index;
GMutex index_lock;
/* seek table entries only maintained if upstream is BYTE seekable */
gboolean upstream_seekable;
gboolean upstream_has_duration;
gint64 upstream_size;
GstFormat upstream_format;
/* minimum distance between two index entries */
GstClockTimeDiff idx_interval;
guint64 idx_byte_interval;
/* ts and offset of last entry added */
GstClockTime index_last_ts;
gint64 index_last_offset;
gboolean index_last_valid;
/* timestamps currently produced are accurate, e.g. started from 0 onwards */
gboolean exact_position;
/* seek events are temporarily kept to match them with newsegments */
GSList *pending_seeks;
/* reverse playback */
GSList *buffers_pending;
GSList *buffers_head;
GSList *buffers_queued;
GSList *buffers_send;
GstClockTime last_pts;
GstClockTime last_dts;
gint64 last_offset;
/* Pending serialized events */
GList *pending_events;
/* If baseparse has checked the caps to identify if it is
* handling video or audio */
gboolean checked_media;
/* offset of last parsed frame/data */
gint64 prev_offset;
/* force a new frame, regardless of offset */
gboolean new_frame;
/* whether we are merely scanning for a frame */
gboolean scanning;
/* ... and resulting frame, if any */
GstBaseParseFrame *scanned_frame;
/* TRUE if we're still detecting the format, i.e.
* if ::detect() is still called for future buffers */
gboolean detecting;
GList *detect_buffers;
guint detect_buffers_size;
/* True when no buffers have been received yet */
gboolean first_buffer;
/* if TRUE, a STREAM_START event needs to be pushed */
gboolean push_stream_start;
/* When we need to skip more data than we have currently */
guint skip;
/* Tag handling (stream tags only, global tags are passed through as-is) */
GstTagList *upstream_tags;
GstTagList *parser_tags;
GstTagMergeMode parser_tags_merge_mode;
gboolean tags_changed;
/* Current segment seqnum */
guint32 segment_seqnum;
};
typedef struct _GstBaseParseSeek
{
GstSegment segment;
gboolean accurate;
gint64 offset;
GstClockTime start_ts;
} GstBaseParseSeek;
#define DEFAULT_DISABLE_PASSTHROUGH FALSE
enum
{
PROP_0,
PROP_DISABLE_PASSTHROUGH,
PROP_LAST
};
#define GST_BASE_PARSE_INDEX_LOCK(parse) \
g_mutex_lock (&parse->priv->index_lock);
#define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
g_mutex_unlock (&parse->priv->index_lock);
static GstElementClass *parent_class = NULL;
static gint base_parse_private_offset = 0;
static void gst_base_parse_class_init (GstBaseParseClass * klass);
static void gst_base_parse_init (GstBaseParse * parse,
GstBaseParseClass * klass);
GType
gst_base_parse_get_type (void)
{
static volatile gsize base_parse_type = 0;
if (g_once_init_enter (&base_parse_type)) {
static const GTypeInfo base_parse_info = {
sizeof (GstBaseParseClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gst_base_parse_class_init,
NULL,
NULL,
sizeof (GstBaseParse),
0,
(GInstanceInitFunc) gst_base_parse_init,
};
GType _type;
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
base_parse_private_offset =
g_type_add_instance_private (_type, sizeof (GstBaseParsePrivate));
g_once_init_leave (&base_parse_type, _type);
}
return (GType) base_parse_type;
}
static inline GstBaseParsePrivate *
gst_base_parse_get_instance_private (GstBaseParse * self)
{
return (G_STRUCT_MEMBER_P (self, base_parse_private_offset));
}
static void gst_base_parse_finalize (GObject * object);
static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
GstStateChange transition);
static void gst_base_parse_reset (GstBaseParse * parse);
#if 0
static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
static GstIndex *gst_base_parse_get_index (GstElement * element);
#endif
static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
GstObject * parent);
static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
GstEvent * event);
static void gst_base_parse_set_upstream_tags (GstBaseParse * parse,
GstTagList * taglist);
static void gst_base_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static void gst_base_parse_loop (GstPad * pad);
static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
GstQuery * query);
static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
GstQuery * query);
static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
GstClockTime time, gboolean before, GstClockTime * _ts);
static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
GstClockTime * _time, gint64 * _offset);
static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
gboolean prev_head);
static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse);
static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
static void gst_base_parse_push_pending_events (GstBaseParse * parse);
static void
gst_base_parse_clear_queues (GstBaseParse * parse)
{
g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
g_slist_free (parse->priv->buffers_queued);
parse->priv->buffers_queued = NULL;
g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
NULL);
g_slist_free (parse->priv->buffers_pending);
parse->priv->buffers_pending = NULL;
g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
g_slist_free (parse->priv->buffers_head);
parse->priv->buffers_head = NULL;
g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
g_slist_free (parse->priv->buffers_send);
parse->priv->buffers_send = NULL;
g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
g_list_free (parse->priv->detect_buffers);
parse->priv->detect_buffers = NULL;
parse->priv->detect_buffers_size = 0;
g_queue_foreach (&parse->priv->queued_frames,
(GFunc) gst_base_parse_frame_free, NULL);
g_queue_clear (&parse->priv->queued_frames);
gst_buffer_replace (&parse->priv->cache, NULL);
g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
g_list_free (parse->priv->pending_events);
parse->priv->pending_events = NULL;
parse->priv->checked_media = FALSE;
}
static void
gst_base_parse_finalize (GObject * object)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
g_object_unref (parse->priv->adapter);
if (parse->priv->index) {
gst_object_unref (parse->priv->index);
parse->priv->index = NULL;
}
g_mutex_clear (&parse->priv->index_lock);
gst_base_parse_clear_queues (parse);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_parse_class_init (GstBaseParseClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
if (base_parse_private_offset != 0)
g_type_class_adjust_private_offset (klass, &base_parse_private_offset);
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
/**
* GstBaseParse:disable-passthrough:
*
* If set to %TRUE, baseparse will unconditionally force parsing of the
* incoming data. This can be required in the rare cases where the incoming
* side-data (caps, pts, dts, ...) is not trusted by the user and wants to
* force validation and parsing of the incoming data.
* If set to %FALSE, decision of whether to parse the data or not is up to
* the implementation (standard behaviour).
*/
g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
"Force processing (disables passthrough)",
DEFAULT_DISABLE_PASSTHROUGH,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
#if 0
gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
#endif
/* Default handlers */
klass->sink_event = gst_base_parse_sink_event_default;
klass->src_event = gst_base_parse_src_event_default;
klass->sink_query = gst_base_parse_sink_query_default;
klass->src_query = gst_base_parse_src_query_default;
klass->convert = gst_base_parse_convert_default;
GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
"baseparse element");
}
static void
gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
{
GstPadTemplate *pad_template;
GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
parse->priv = gst_base_parse_get_instance_private (parse);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
g_return_if_fail (pad_template != NULL);
parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_event_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
gst_pad_set_query_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
gst_pad_set_chain_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_chain));
gst_pad_set_activate_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
gst_pad_set_activatemode_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
GST_DEBUG_OBJECT (parse, "sinkpad created");
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
g_return_if_fail (pad_template != NULL);
parse->srcpad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_event_function (parse->srcpad,
GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
gst_pad_set_query_function (parse->srcpad,
GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
gst_pad_use_fixed_caps (parse->srcpad);
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
GST_DEBUG_OBJECT (parse, "src created");
g_queue_init (&parse->priv->queued_frames);
parse->priv->adapter = gst_adapter_new ();
parse->priv->pad_mode = GST_PAD_MODE_NONE;
g_mutex_init (&parse->priv->index_lock);
/* init state */
gst_base_parse_reset (parse);
GST_DEBUG_OBJECT (parse, "init ok");
GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
parse->priv->upstream_tags = NULL;
parse->priv->parser_tags = NULL;
parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
}
static void
gst_base_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
switch (prop_id) {
case PROP_DISABLE_PASSTHROUGH:
parse->priv->disable_passthrough = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
switch (prop_id) {
case PROP_DISABLE_PASSTHROUGH:
g_value_set_boolean (value, parse->priv->disable_passthrough);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_base_parse_frame_copy:
* @frame: a #GstBaseParseFrame
*
* Copies a #GstBaseParseFrame.
*
* Returns: A copy of @frame
*/
GstBaseParseFrame *
gst_base_parse_frame_copy (GstBaseParseFrame * frame)
{
GstBaseParseFrame *copy;
copy = g_slice_dup (GstBaseParseFrame, frame);
copy->buffer = gst_buffer_ref (frame->buffer);
copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
GST_TRACE ("copied frame %p -> %p", frame, copy);
return copy;
}
/**
* gst_base_parse_frame_free:
* @frame: A #GstBaseParseFrame
*
* Frees the provided @frame.
*/
void
gst_base_parse_frame_free (GstBaseParseFrame * frame)
{
GST_TRACE ("freeing frame %p", frame);
if (frame->buffer) {
gst_buffer_unref (frame->buffer);
frame->buffer = NULL;
}
if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
g_slice_free (GstBaseParseFrame, frame);
} else {
memset (frame, 0, sizeof (*frame));
}
}
G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
(GBoxedCopyFunc) gst_base_parse_frame_copy,
(GBoxedFreeFunc) gst_base_parse_frame_free);
/**
* gst_base_parse_frame_init:
* @frame: #GstBaseParseFrame.
*
* Sets a #GstBaseParseFrame to initial state. Currently this means
* all public fields are zero-ed and a private flag is set to make
* sure gst_base_parse_frame_free() only frees the contents but not
* the actual frame. Use this function to initialise a #GstBaseParseFrame
* allocated on the stack.
*/
void
gst_base_parse_frame_init (GstBaseParseFrame * frame)
{
memset (frame, 0, sizeof (GstBaseParseFrame));
frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
GST_TRACE ("inited frame %p", frame);
}
/**
* gst_base_parse_frame_new:
* @buffer: (transfer none): a #GstBuffer
* @flags: the flags
* @overhead: number of bytes in this frame which should be counted as
* metadata overhead, ie. not used to calculate the average bitrate.
* Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
*
* Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
* elements written in C should usually allocate the frame on the stack and
* then use gst_base_parse_frame_init() to initialise it.
*
* Returns: a newly-allocated #GstBaseParseFrame. Free with
* gst_base_parse_frame_free() when no longer needed.
*/
GstBaseParseFrame *
gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
gint overhead)
{
GstBaseParseFrame *frame;
frame = g_slice_new0 (GstBaseParseFrame);
frame->buffer = gst_buffer_ref (buffer);
GST_TRACE ("created frame %p", frame);
return frame;
}
static inline void
gst_base_parse_update_flags (GstBaseParse * parse)
{
parse->flags = 0;
/* set flags one by one for clarity */
if (G_UNLIKELY (parse->priv->drain))
parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
/* losing sync is pretty much a discont (and vice versa), no ? */
if (G_UNLIKELY (parse->priv->discont))
parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
}
static inline void
gst_base_parse_update_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
if (G_UNLIKELY (parse->priv->discont)) {
GST_DEBUG_OBJECT (parse, "marking DISCONT");
GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
} else {
GST_BUFFER_FLAG_UNSET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
}
if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
GST_LOG_OBJECT (parse, "marking as new frame");
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
}
frame->offset = parse->priv->prev_offset = parse->priv->offset;
}
static void
gst_base_parse_reset (GstBaseParse * parse)
{
GST_OBJECT_LOCK (parse);
gst_segment_init (&parse->segment, GST_FORMAT_TIME);
parse->priv->duration = -1;
parse->priv->min_frame_size = 1;
parse->priv->discont = TRUE;
parse->priv->flushing = FALSE;
parse->priv->saw_gaps = FALSE;
parse->priv->offset = 0;
parse->priv->sync_offset = 0;
parse->priv->update_interval = -1;
parse->priv->fps_num = parse->priv->fps_den = 0;
parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
parse->priv->lead_in = parse->priv->lead_out = 0;
parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
parse->priv->bitrate = 0;
parse->priv->framecount = 0;
parse->priv->bytecount = 0;
parse->priv->acc_duration = 0;
parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
parse->priv->first_frame_offset = -1;
parse->priv->estimated_duration = -1;
parse->priv->estimated_drift = 0;
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->next_dts = 0;
parse->priv->syncable = TRUE;
parse->priv->passthrough = FALSE;
parse->priv->pts_interpolate = TRUE;
parse->priv->infer_ts = TRUE;
parse->priv->has_timing_info = FALSE;
parse->priv->min_bitrate = G_MAXUINT;
parse->priv->max_bitrate = 0;
parse->priv->avg_bitrate = 0;
parse->priv->posted_avg_bitrate = 0;
parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
parse->priv->index_last_offset = -1;
parse->priv->index_last_valid = TRUE;
parse->priv->upstream_seekable = FALSE;
parse->priv->upstream_size = 0;
parse->priv->upstream_has_duration = FALSE;
parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
parse->priv->idx_interval = 0;
parse->priv->idx_byte_interval = 0;
parse->priv->exact_position = TRUE;
parse->priv->seen_keyframe = FALSE;
parse->priv->checked_media = FALSE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_offset = 0;
parse->priv->skip = 0;
g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
NULL);
g_list_free (parse->priv->pending_events);
parse->priv->pending_events = NULL;
if (parse->priv->cache) {
gst_buffer_unref (parse->priv->cache);
parse->priv->cache = NULL;
}
g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
g_slist_free (parse->priv->pending_seeks);
parse->priv->pending_seeks = NULL;
if (parse->priv->adapter)
gst_adapter_clear (parse->priv->adapter);
gst_base_parse_set_upstream_tags (parse, NULL);
if (parse->priv->parser_tags) {
gst_tag_list_unref (parse->priv->parser_tags);
parse->priv->parser_tags = NULL;
}
parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
parse->priv->new_frame = TRUE;
parse->priv->first_buffer = TRUE;
g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
g_list_free (parse->priv->detect_buffers);
parse->priv->detect_buffers = NULL;
parse->priv->detect_buffers_size = 0;
parse->priv->segment_seqnum = GST_SEQNUM_INVALID;
GST_OBJECT_UNLOCK (parse);
}
static gboolean
gst_base_parse_check_bitrate_tag (GstBaseParse * parse, const gchar * tag)
{
gboolean got_tag = FALSE;
guint n = 0;
if (parse->priv->upstream_tags != NULL)
got_tag = gst_tag_list_get_uint (parse->priv->upstream_tags, tag, &n);
if (!got_tag && parse->priv->parser_tags != NULL)
got_tag = gst_tag_list_get_uint (parse->priv->parser_tags, tag, &n);
return got_tag;
}
/* check if upstream or subclass tags contain bitrates already */
static void
gst_base_parse_check_bitrate_tags (GstBaseParse * parse)
{
parse->priv->post_min_bitrate =
!gst_base_parse_check_bitrate_tag (parse, GST_TAG_MINIMUM_BITRATE);
parse->priv->post_avg_bitrate =
!gst_base_parse_check_bitrate_tag (parse, GST_TAG_BITRATE);
parse->priv->post_max_bitrate =
!gst_base_parse_check_bitrate_tag (parse, GST_TAG_MAXIMUM_BITRATE);
}
/* Queues new tag event with the current combined state of the stream tags
* (i.e. upstream tags merged with subclass tags and current baseparse tags) */
static void
gst_base_parse_queue_tag_event_update (GstBaseParse * parse)
{
GstTagList *merged_tags;
GST_LOG_OBJECT (parse, "upstream : %" GST_PTR_FORMAT,
parse->priv->upstream_tags);
GST_LOG_OBJECT (parse, "parser : %" GST_PTR_FORMAT,
parse->priv->parser_tags);
GST_LOG_OBJECT (parse, "mode : %d", parse->priv->parser_tags_merge_mode);
merged_tags =
gst_tag_list_merge (parse->priv->upstream_tags, parse->priv->parser_tags,
parse->priv->parser_tags_merge_mode);
GST_DEBUG_OBJECT (parse, "merged : %" GST_PTR_FORMAT, merged_tags);
if (merged_tags == NULL)
return;
if (gst_tag_list_is_empty (merged_tags)) {
gst_tag_list_unref (merged_tags);
return;
}
if (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE) {
/* only add bitrate tags to non-empty taglists for now, and only if neither
* upstream tags nor the subclass sets the bitrate tag in question already */
if (parse->priv->min_bitrate != G_MAXUINT && parse->priv->post_min_bitrate) {
GST_LOG_OBJECT (parse, "adding min bitrate %u", parse->priv->min_bitrate);
gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
}
if (parse->priv->max_bitrate != 0 && parse->priv->post_max_bitrate) {
GST_LOG_OBJECT (parse, "adding max bitrate %u", parse->priv->max_bitrate);
gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
}
if (parse->priv->avg_bitrate != 0 && parse->priv->post_avg_bitrate) {
parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
GST_LOG_OBJECT (parse, "adding avg bitrate %u", parse->priv->avg_bitrate);
gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
GST_TAG_BITRATE, parse->priv->avg_bitrate, NULL);
}
}
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events,
gst_event_new_tag (merged_tags));
}
/* gst_base_parse_parse_frame:
* @parse: #GstBaseParse.
* @buffer: #GstBuffer.
*
* Default callback for parse_frame.
*/
static GstFlowReturn
gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstBuffer *buffer = frame->buffer;
if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
}
if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
}
if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
}
return GST_FLOW_OK;
}
/* gst_base_parse_convert:
* @parse: #GstBaseParse.
* @src_format: #GstFormat describing the source format.
* @src_value: Source value to be converted.
* @dest_format: #GstFormat defining the converted format.
* @dest_value: Pointer where the conversion result will be put.
*
* Converts using configured "convert" vmethod in #GstBaseParse class.
*
* Returns: %TRUE if conversion was successful.
*/
static gboolean
gst_base_parse_convert (GstBaseParse * parse,
GstFormat src_format,
gint64 src_value, GstFormat dest_format, gint64 * dest_value)
{
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
gboolean ret;
g_return_val_if_fail (dest_value != NULL, FALSE);
if (!klass->convert)
return FALSE;
ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
#ifndef GST_DISABLE_GST_DEBUG
{
if (ret) {
if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
GST_LOG_OBJECT (parse,
"TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
GST_TIME_ARGS (src_value), *dest_value);
} else if (dest_format == GST_FORMAT_TIME &&
src_format == GST_FORMAT_BYTES) {
GST_LOG_OBJECT (parse,
"BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
src_value, GST_TIME_ARGS (*dest_value));
} else {
GST_LOG_OBJECT (parse,
"%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
GST_STR_NULL (gst_format_get_name (src_format)),
GST_STR_NULL (gst_format_get_name (dest_format)),
src_value, *dest_value);
}
} else {
GST_DEBUG_OBJECT (parse, "conversion failed");
}
}
#endif
return ret;
}
static gboolean
update_upstream_provided (GQuark field_id, const GValue * value,
gpointer user_data)
{
GstCaps *default_caps = user_data;
gint i;
gint caps_size;
caps_size = gst_caps_get_size (default_caps);
for (i = 0; i < caps_size; i++) {
GstStructure *structure = gst_caps_get_structure (default_caps, i);
if (gst_structure_id_has_field (structure, field_id))
gst_structure_id_set_value (structure, field_id, value);
}
return TRUE;
}
static GstCaps *
gst_base_parse_negotiate_default_caps (GstBaseParse * parse)
{
GstCaps *caps, *templcaps;
GstCaps *sinkcaps = NULL;
GstCaps *default_caps = NULL;
GstStructure *structure;
templcaps = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse));
caps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), templcaps);
if (caps)
gst_caps_unref (templcaps);
else
caps = templcaps;
templcaps = NULL;
if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps)) {
goto caps_error;
}
GST_LOG_OBJECT (parse, "peer caps %" GST_PTR_FORMAT, caps);
/* before fixating, try to use whatever upstream provided */
default_caps = gst_caps_copy (caps);
sinkcaps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
GST_LOG_OBJECT (parse, "current caps %" GST_PTR_FORMAT " for sinkpad",
sinkcaps);
if (sinkcaps) {
structure = gst_caps_get_structure (sinkcaps, 0);
gst_structure_foreach (structure, update_upstream_provided, default_caps);
}
default_caps = gst_caps_fixate (default_caps);
if (!default_caps) {
GST_WARNING_OBJECT (parse, "Failed to create default caps !");
goto caps_error;
}
GST_INFO_OBJECT (parse,
"Chose default caps %" GST_PTR_FORMAT " for initial gap", default_caps);
if (sinkcaps)
gst_caps_unref (sinkcaps);
gst_caps_unref (caps);
return default_caps;
caps_error:
{
if (caps)
gst_caps_unref (caps);
if (sinkcaps)
gst_caps_unref (sinkcaps);
return NULL;
}
}
/* gst_base_parse_sink_event:
* @pad: #GstPad that received the event.
* @event: #GstEvent to be handled.
*
* Handler for sink pad events.
*
* Returns: %TRUE if the event was handled.
*/
static gboolean
gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstBaseParse *parse = GST_BASE_PARSE (parent);
GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
gboolean ret;
ret = bclass->sink_event (parse, event);
return ret;
}
/* gst_base_parse_sink_event_default:
* @parse: #GstBaseParse.
* @event: #GstEvent to be handled.
*
* Element-level event handler function.
*
* The event will be unreffed only if it has been handled and this
* function returns %TRUE
*
* Returns: %TRUE if the event was handled and not need forwarding.
*/
static gboolean
gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
{
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
gboolean ret = FALSE;
gboolean forward_immediate = FALSE;
GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
if (klass->set_sink_caps)
ret = klass->set_sink_caps (parse, caps);
else
ret = TRUE;
/* will send our own caps downstream */
gst_event_unref (event);
event = NULL;
break;
}
case GST_EVENT_SEGMENT:
{
const GstSegment *in_segment;
GstSegment out_segment;
gint64 offset = 0, next_dts;
parse->priv->segment_seqnum = gst_event_get_seqnum (event);
gst_event_parse_segment (event, &in_segment);
gst_segment_init (&out_segment, GST_FORMAT_TIME);
out_segment.rate = in_segment->rate;
out_segment.applied_rate = in_segment->applied_rate;
GST_DEBUG_OBJECT (parse, "New segment %" GST_SEGMENT_FORMAT, in_segment);
GST_DEBUG_OBJECT (parse, "Current segment %" GST_SEGMENT_FORMAT,
&parse->segment);
parse->priv->upstream_format = in_segment->format;
if (in_segment->format == GST_FORMAT_BYTES) {
GstBaseParseSeek *seek = NULL;
GSList *node;
/* stop time is allowed to be open-ended, but not start & pos */
offset = in_segment->time;
GST_OBJECT_LOCK (parse);
for (node = parse->priv->pending_seeks; node; node = node->next) {
GstBaseParseSeek *tmp = node->data;
if (tmp->offset == offset) {
seek = tmp;
break;
}
}
parse->priv->pending_seeks =
g_slist_remove (parse->priv->pending_seeks, seek);
GST_OBJECT_UNLOCK (parse);
if (seek) {
GST_DEBUG_OBJECT (parse,
"Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
seek->accurate ? " accurate" : "", &seek->segment);
out_segment.start = seek->segment.start;
out_segment.stop = seek->segment.stop;
out_segment.time = seek->segment.start;
next_dts = seek->start_ts;
parse->priv->exact_position = seek->accurate;
g_free (seek);
} else {
/* best attempt convert */
/* as these are only estimates, stop is kept open-ended to avoid
* premature cutting */
gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
GST_FORMAT_TIME, (gint64 *) & next_dts);
out_segment.start = next_dts;
out_segment.stop = GST_CLOCK_TIME_NONE;
out_segment.time = next_dts;
parse->priv->exact_position = (in_segment->start == 0);
}
gst_event_unref (event);
event = gst_event_new_segment (&out_segment);
gst_event_set_seqnum (event, parse->priv->segment_seqnum);
GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
GST_SEGMENT_FORMAT, in_segment);
} else if (in_segment->format != GST_FORMAT_TIME) {
/* Unknown incoming segment format. Output a default open-ended
* TIME segment */
gst_event_unref (event);
out_segment.start = 0;
out_segment.stop = GST_CLOCK_TIME_NONE;
out_segment.time = 0;
event = gst_event_new_segment (&out_segment);
gst_event_set_seqnum (event, parse->priv->segment_seqnum);
next_dts = 0;
} else {
/* not considered BYTE seekable if it is talking to us in TIME,
* whatever else it might claim */
parse->priv->upstream_seekable = FALSE;
next_dts = in_segment->start;
gst_event_copy_segment (event, &out_segment);
}
GST_DEBUG_OBJECT (parse, "OUT segment %" GST_SEGMENT_FORMAT,
&out_segment);
memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
/*
gst_segment_set_newsegment (&parse->segment, update, rate,
applied_rate, format, start, stop, start);
*/
ret = TRUE;
/* save the segment for later, right before we push a new buffer so that
* the caps are fixed and the next linked element can receive
* the segment but finish the current segment */
GST_DEBUG_OBJECT (parse, "draining current segment");
if (in_segment->rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, FALSE);
gst_adapter_clear (parse->priv->adapter);
parse->priv->offset = offset;
parse->priv->sync_offset = offset;
parse->priv->next_dts = next_dts;
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts_from_pts = FALSE;
parse->priv->discont = TRUE;
parse->priv->seen_keyframe = FALSE;
parse->priv->skip = 0;
break;
}
case GST_EVENT_SEGMENT_DONE:
/* need to drain now, rather than upon a new segment,
* since that would have SEGMENT_DONE come before potential
* delayed last part of the current segment */
GST_DEBUG_OBJECT (parse, "draining current segment");
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, FALSE);
/* Also forward event immediately, there might be no new data
* coming afterwards that would allow us to forward it later */
forward_immediate = TRUE;
break;
case GST_EVENT_FLUSH_START:
GST_OBJECT_LOCK (parse);
parse->priv->flushing = TRUE;
GST_OBJECT_UNLOCK (parse);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (parse->priv->adapter);
gst_base_parse_clear_queues (parse);
parse->priv->flushing = FALSE;
parse->priv->discont = TRUE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->new_frame = TRUE;
parse->priv->skip = 0;
forward_immediate = TRUE;
break;
case GST_EVENT_EOS:
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, TRUE);
/* If we STILL have zero frames processed, fire an error */
if (parse->priv->framecount == 0 && !parse->priv->saw_gaps &&
!parse->priv->first_buffer) {
GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
("No valid frames found before end of stream"), (NULL));
}
if (!parse->priv->saw_gaps
&& parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
/* We've not posted bitrate tags yet - do so now */
gst_base_parse_queue_tag_event_update (parse);
}
/* newsegment and other serialized events before eos */
gst_base_parse_push_pending_events (parse);
forward_immediate = TRUE;
break;
case GST_EVENT_CUSTOM_DOWNSTREAM:{
/* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
#ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
#define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
#endif
const GstStructure *s;
gboolean ev_still_state;
s = gst_event_get_structure (event);
if (s != NULL &&
gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
if (ev_still_state) {
GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, TRUE);
}
forward_immediate = TRUE;
}
break;
}
case GST_EVENT_GAP:
{
GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
/* Ensure we have caps before forwarding the event */
if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
GstCaps *default_caps = NULL;
if ((default_caps = gst_base_parse_negotiate_default_caps (parse))) {
GList *l;
GstEvent *caps_event = gst_event_new_caps (default_caps);
GST_DEBUG_OBJECT (parse,
"Store caps event to pending list for initial pre-rolling");
/* Events are in decreasing order. Go down the list until we
* find the first pre-CAPS event and insert our CAPS event there.
*
* There should be a SEGMENT event already, which is > CAPS */
for (l = parse->priv->pending_events; l; l = l->next) {
GstEvent *e = l->data;
if (GST_EVENT_TYPE (e) < GST_EVENT_CAPS) {
parse->priv->pending_events =
g_list_insert_before (parse->priv->pending_events, l,
caps_event);
break;
}
}
/* No pending event that is < CAPS, so we have to add it at the very
* end of the list */
if (!l) {
parse->priv->pending_events =
g_list_append (parse->priv->pending_events, caps_event);
}
gst_caps_unref (default_caps);
} else {
gst_event_unref (event);
event = NULL;
ret = FALSE;
GST_ELEMENT_ERROR (parse, STREAM, FORMAT, (NULL),
("Parser output not negotiated before GAP event."));
break;
}
}
gst_base_parse_push_pending_events (parse);
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, TRUE);
forward_immediate = TRUE;
parse->priv->saw_gaps = TRUE;
break;
}
case GST_EVENT_TAG:
{
GstTagList *tags = NULL;
gst_event_parse_tag (event, &tags);
/* We only care about stream tags here, global tags we just forward */
if (gst_tag_list_get_scope (tags) != GST_TAG_SCOPE_STREAM)
break;
gst_base_parse_set_upstream_tags (parse, tags);
gst_base_parse_queue_tag_event_update (parse);
parse->priv->tags_changed = FALSE;
gst_event_unref (event);
event = NULL;
ret = TRUE;
break;
}
case GST_EVENT_STREAM_START:
{
if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
forward_immediate = TRUE;
gst_base_parse_set_upstream_tags (parse, NULL);
parse->priv->tags_changed = TRUE;
break;
}
default:
break;
}
/* Forward non-serialized events and EOS/FLUSH_STOP immediately.
* For EOS this is required because no buffer or serialized event
* will come after EOS and nothing could trigger another
* _finish_frame() call. *
* If the subclass handles sending of EOS manually it can return
* _DROPPED from ::finish() and all other subclasses should have
* decoded/flushed all remaining data before this
*
* For FLUSH_STOP this is required because it is expected
* to be forwarded immediately and no buffers are queued anyway.
*/
if (event) {
if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
ret = gst_pad_push_event (parse->srcpad, event);
} else {
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events, event);
ret = TRUE;
}
}
GST_DEBUG_OBJECT (parse, "event handled");
return ret;
}
static gboolean
gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
{
GstPad *pad;
gboolean res;
pad = GST_BASE_PARSE_SINK_PAD (parse);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstBaseParseClass *bclass;
bclass = GST_BASE_PARSE_GET_CLASS (parse);
if (bclass->get_sink_caps) {
GstCaps *caps, *filter;
gst_query_parse_caps (query, &filter);
caps = bclass->get_sink_caps (parse, filter);
GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
caps);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
} else {
GstCaps *caps, *template_caps, *filter;
gst_query_parse_caps (query, &filter);
template_caps = gst_pad_get_pad_template_caps (pad);
if (filter != NULL) {
caps =
gst_caps_intersect_full (filter, template_caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (template_caps);
} else {
caps = template_caps;
}
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
}
break;
}
default:
{
res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
break;
}
}
return res;
}
static gboolean
gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstBaseParseClass *bclass;
GstBaseParse *parse;
gboolean ret;
parse = GST_BASE_PARSE (parent);
bclass = GST_BASE_PARSE_GET_CLASS (parse);
GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
if (bclass->sink_query)
ret = bclass->sink_query (parse, query);
else
ret = FALSE;
GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
GST_QUERY_TYPE_NAME (query), ret, query);
return ret;
}
static gboolean
gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstBaseParseClass *bclass;
GstBaseParse *parse;
gboolean ret;
parse = GST_BASE_PARSE (parent);
bclass = GST_BASE_PARSE_GET_CLASS (parse);
GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
GST_QUERY_TYPE_NAME (query), query);
if (bclass->src_query)
ret = bclass->src_query (parse, query);
else
ret = FALSE;
GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
GST_QUERY_TYPE_NAME (query), ret, query);
return ret;
}
/* gst_base_parse_src_event:
* @pad: #GstPad that received the event.
* @event: #GstEvent that was received.
*
* Handler for source pad events.
*
* Returns: %TRUE if the event was handled.
*/
static gboolean
gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstBaseParse *parse;
GstBaseParseClass *bclass;
gboolean ret = TRUE;
parse = GST_BASE_PARSE (parent);
bclass = GST_BASE_PARSE_GET_CLASS (parse);
GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
GST_EVENT_TYPE_NAME (event));
if (bclass->src_event)
ret = bclass->src_event (parse, event);
else
gst_event_unref (event);
return ret;
}
static gboolean
gst_base_parse_is_seekable (GstBaseParse * parse)
{
/* FIXME: could do more here, e.g. check index or just send data from 0
* in pull mode and let decoder/sink clip */
return parse->priv->syncable;
}
/* gst_base_parse_src_event_default:
* @parse: #GstBaseParse.
* @event: #GstEvent that was received.
*
* Default srcpad event handler.
*
* Returns: %TRUE if the event was handled and can be dropped.
*/
static gboolean
gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
{
gboolean res = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (gst_base_parse_is_seekable (parse))
res = gst_base_parse_handle_seek (parse, event);
break;
default:
res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
event);
break;
}
return res;
}
/**
* gst_base_parse_convert_default:
* @parse: #GstBaseParse.
* @src_format: #GstFormat describing the source format.
* @src_value: Source value to be converted.
* @dest_format: #GstFormat defining the converted format.
* @dest_value: (out): Pointer where the conversion result will be put.
*
* Default implementation of #GstBaseParseClass.convert().
*
* Returns: %TRUE if conversion was successful.
*/
gboolean
gst_base_parse_convert_default (GstBaseParse * parse,
GstFormat src_format,
gint64 src_value, GstFormat dest_format, gint64 * dest_value)
{
gboolean ret = FALSE;
guint64 bytes, duration;
if (G_UNLIKELY (src_format == dest_format)) {
*dest_value = src_value;
return TRUE;
}
if (G_UNLIKELY (src_value == -1)) {
*dest_value = -1;
return TRUE;
}
if (G_UNLIKELY (src_value == 0)) {
*dest_value = 0;
return TRUE;
}
if (parse->priv->upstream_format != GST_FORMAT_BYTES) {
/* don't do byte format conversions if we're not really parsing
* a raw elementary stream, since we don't really have BYTES
* position / duration info */
if (src_format == GST_FORMAT_BYTES || dest_format == GST_FORMAT_BYTES)
goto no_slaved_conversions;
}
/* need at least some frames */
if (!parse->priv->framecount)
goto no_framecount;
duration = parse->priv->acc_duration / GST_MSECOND;
bytes = parse->priv->bytecount;
if (G_UNLIKELY (!duration || !bytes))
goto no_duration_bytes;
if (src_format == GST_FORMAT_BYTES) {
if (dest_format == GST_FORMAT_TIME) {
/* BYTES -> TIME conversion */
GST_DEBUG_OBJECT (parse, "converting bytes -> time");
*dest_value = gst_util_uint64_scale (src_value, duration, bytes);
*dest_value *= GST_MSECOND;
GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
*dest_value / GST_MSECOND);
ret = TRUE;
} else {
GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
}
} else if (src_format == GST_FORMAT_TIME) {
if (dest_format == GST_FORMAT_BYTES) {
GST_DEBUG_OBJECT (parse, "converting time -> bytes");
*dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
duration);
GST_DEBUG_OBJECT (parse,
"time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
src_value / GST_MSECOND, *dest_value);
ret = TRUE;
} else {
GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
}
} else if (src_format == GST_FORMAT_DEFAULT) {
/* DEFAULT == frame-based */
if (dest_format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (parse, "converting default -> time");
if (parse->priv->fps_den) {
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
ret = TRUE;
}
} else {
GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
}
} else {
GST_DEBUG_OBJECT (parse, "conversion not implemented");
}
return ret;
/* ERRORS */
no_framecount:
{
GST_DEBUG_OBJECT (parse, "no framecount");
return FALSE;
}
no_duration_bytes:
{
GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
G_GUINT64_FORMAT, duration, bytes);
return FALSE;
}
no_slaved_conversions:
{
GST_DEBUG_OBJECT (parse,
"Can't do format conversions when upstream format is not BYTES");
return FALSE;
}
}
static void
gst_base_parse_update_duration (GstBaseParse * parse)
{
gint64 ptot, dest_value;
if (!gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &ptot))
return;
if (!gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
GST_FORMAT_TIME, &dest_value))
return;
/* inform if duration changed, but try to avoid spamming */
parse->priv->estimated_drift += dest_value - parse->priv->estimated_duration;
parse->priv->estimated_duration = dest_value;
GST_LOG_OBJECT (parse,
"updated estimated duration to %" GST_TIME_FORMAT,
GST_TIME_ARGS (dest_value));
if (parse->priv->estimated_drift > GST_SECOND ||
parse->priv->estimated_drift < -GST_SECOND) {
gst_element_post_message (GST_ELEMENT (parse),
gst_message_new_duration_changed (GST_OBJECT (parse)));
parse->priv->estimated_drift = 0;
}
}
/* gst_base_parse_update_bitrates:
* @parse: #GstBaseParse.
* @buffer: Current frame as a #GstBuffer
*
* Keeps track of the minimum and maximum bitrates, and also maintains a
* running average bitrate of the stream so far.
*/
static void
gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
{
guint64 data_len, frame_dur;
gint overhead;
guint frame_bitrate;
guint64 frame_bitrate64;
GstBuffer *buffer = frame->buffer;
overhead = frame->overhead;
if (overhead == -1)
return;
data_len = gst_buffer_get_size (buffer) - overhead;
parse->priv->data_bytecount += data_len;
/* duration should be valid by now,
* either set by subclass or maybe based on fps settings */
if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
guint64 avg_bitrate;
/* Calculate duration of a frame from buffer properties */
frame_dur = GST_BUFFER_DURATION (buffer);
avg_bitrate = gst_util_uint64_scale (GST_SECOND,
8 * parse->priv->data_bytecount, parse->priv->acc_duration);
if (avg_bitrate > G_MAXUINT)
return;
parse->priv->avg_bitrate = (guint) avg_bitrate;
} else {
/* No way to figure out frame duration (is this even possible?) */
return;
}
/* override if subclass provided bitrate, e.g. metadata based */
if (parse->priv->bitrate) {
parse->priv->avg_bitrate = parse->priv->bitrate;
/* spread this (confirmed) info ASAP */
if (parse->priv->post_avg_bitrate &&
parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
parse->priv->tags_changed = TRUE;
}
if (!frame_dur)
return;
frame_bitrate64 = gst_util_uint64_scale (GST_SECOND, 8 * data_len, frame_dur);
if (frame_bitrate64 > G_MAXUINT)
return;
frame_bitrate = (guint) frame_bitrate64;
GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
parse->priv->avg_bitrate);
if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
return;
if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE &&
(parse->priv->post_min_bitrate || parse->priv->post_avg_bitrate
|| parse->priv->post_max_bitrate))
parse->priv->tags_changed = TRUE;
if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
if (frame_bitrate < parse->priv->min_bitrate) {
parse->priv->min_bitrate = frame_bitrate;
if (parse->priv->post_min_bitrate)
parse->priv->tags_changed = TRUE;
}
if (frame_bitrate > parse->priv->max_bitrate) {
parse->priv->max_bitrate = frame_bitrate;
if (parse->priv->post_max_bitrate)
parse->priv->tags_changed = TRUE;
}
/* Only update the tag on a 2% change */
if (parse->priv->post_avg_bitrate && parse->priv->avg_bitrate) {
guint64 diffprev = gst_util_uint64_scale (100,
ABSDIFF (parse->priv->avg_bitrate, parse->priv->posted_avg_bitrate),
parse->priv->avg_bitrate);
if (diffprev >= UPDATE_THRESHOLD)
parse->priv->tags_changed = TRUE;
}
}
}
/**
* gst_base_parse_add_index_entry:
* @parse: #GstBaseParse.
* @offset: offset of entry
* @ts: timestamp associated with offset
* @key: whether entry refers to keyframe
* @force: add entry disregarding sanity checks
*
* Adds an entry to the index associating @offset to @ts. It is recommended
* to only add keyframe entries. @force allows to bypass checks, such as
* whether the stream is (upstream) seekable, another entry is already "close"
* to the new entry, etc.
*
* Returns: #gboolean indicating whether entry was added
*/
gboolean
gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
GstClockTime ts, gboolean key, gboolean force)
{
gboolean ret = FALSE;
GstIndexAssociation associations[2];
GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
" @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
if (G_LIKELY (!force)) {
if (!parse->priv->upstream_seekable) {
GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
goto exit;
}
/* FIXME need better helper data structure that handles these issues
* related to ongoing collecting of index entries */
if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
(gint64) offset) {
GST_LOG_OBJECT (parse,
"already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
parse->priv->index_last_offset + parse->priv->idx_byte_interval);
goto exit;
}
if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
parse->priv->idx_interval) {
GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
GST_TIME_ARGS (parse->priv->index_last_ts));
goto exit;
}
/* if last is not really the last one */
if (!parse->priv->index_last_valid) {
GstClockTime prev_ts;
gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
GST_LOG_OBJECT (parse,
"entry too close to existing entry %" GST_TIME_FORMAT,
GST_TIME_ARGS (prev_ts));
parse->priv->index_last_offset = offset;
parse->priv->index_last_ts = ts;
goto exit;
}
}
}
associations[0].format = GST_FORMAT_TIME;
associations[0].value = ts;
associations[1].format = GST_FORMAT_BYTES;
associations[1].value = offset;
/* index might change on-the-fly, although that would be nutty app ... */
GST_BASE_PARSE_INDEX_LOCK (parse);
gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
(key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
(const GstIndexAssociation *) &associations);
GST_BASE_PARSE_INDEX_UNLOCK (parse);
if (key) {
parse->priv->index_last_offset = offset;
parse->priv->index_last_ts = ts;
}
ret = TRUE;
exit:
return ret;
}
/* check for seekable upstream, above and beyond a mere query */
static void
gst_base_parse_check_seekability (GstBaseParse * parse)
{
GstQuery *query;
gboolean seekable = FALSE;
gint64 start = -1, stop = -1;
guint idx_interval = 0;
guint64 idx_byte_interval = 0;
query = gst_query_new_seeking (GST_FORMAT_BYTES);
if (!gst_pad_peer_query (parse->sinkpad, query)) {
GST_DEBUG_OBJECT (parse, "seeking query failed");
goto done;
}
gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
/* try harder to query upstream size if we didn't get it the first time */
if (seekable && stop == -1) {
GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
}
/* if upstream doesn't know the size, it's likely that it's not seekable in
* practice even if it technically may be seekable */
if (seekable && (start != 0 || stop <= start)) {
GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
seekable = FALSE;
}
/* let's not put every single frame into our index */
if (seekable) {
if (stop < 10 * 1024 * 1024)
idx_interval = 100;
else if (stop < 100 * 1024 * 1024)
idx_interval = 500;
else
idx_interval = 1000;
/* ensure that even for large files (e.g. very long audio files), the index
* stays reasonably-size, with some arbitrary limit to the total number of
* index entries */
idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
GST_DEBUG_OBJECT (parse,
"Limiting index entries to %d, indexing byte interval %"
G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
}
done:
gst_query_unref (query);
GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
G_GUINT64_FORMAT ")", seekable, start, stop);
parse->priv->upstream_seekable = seekable;
parse->priv->upstream_size = seekable ? stop : 0;
GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
parse->priv->idx_interval = idx_interval * GST_MSECOND;
parse->priv->idx_byte_interval = idx_byte_interval;
}
/* some misc checks on upstream */
static void
gst_base_parse_check_upstream (GstBaseParse * parse)
{
gint64 stop;
if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
/* upstream has one, accept it also, and no further updates */
gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
parse->priv->upstream_has_duration = TRUE;
}
GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
parse->priv->upstream_has_duration);
}
/* checks src caps to determine if dealing with audio or video */
/* TODO maybe forego automagic stuff and let subclass configure it ? */
static void
gst_base_parse_check_media (GstBaseParse * parse)
{
GstCaps *caps;
GstStructure *s;
caps = gst_pad_get_current_caps (parse->srcpad);
if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
parse->priv->is_video =
g_str_has_prefix (gst_structure_get_name (s), "video");
} else {
/* historical default */
parse->priv->is_video = FALSE;
}
if (caps)
gst_caps_unref (caps);
parse->priv->checked_media = TRUE;
GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
}
/* takes ownership of frame */
static void
gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
/* frame allocated on the heap, we can just take ownership */
g_queue_push_tail (&parse->priv->queued_frames, frame);
GST_TRACE ("queued frame %p", frame);
} else {
GstBaseParseFrame *copy;
/* probably allocated on the stack, must make a proper copy */
copy = gst_base_parse_frame_copy (frame);
g_queue_push_tail (&parse->priv->queued_frames, copy);
GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
gst_base_parse_frame_free (frame);
}
}
/* makes sure that @buf is properly prepared and decorated for passing
* to baseclass, and an equally setup frame is returned setup with @buf.
* Takes ownership of @buf. */
static GstBaseParseFrame *
gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
{
GstBaseParseFrame *frame = NULL;
buffer = gst_buffer_make_writable (buffer);
GST_LOG_OBJECT (parse,
"preparing frame at offset %" G_GUINT64_FORMAT
" (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
gst_buffer_get_size (buffer));
GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
gst_base_parse_update_flags (parse);
frame = gst_base_parse_frame_new (buffer, 0, 0);
gst_buffer_unref (buffer);
gst_base_parse_update_frame (parse, frame);
/* clear flags for next frame */
parse->priv->discont = FALSE;
parse->priv->new_frame = FALSE;
/* use default handler to provide initial (upstream) metadata */
gst_base_parse_parse_frame (parse, frame);
return frame;
}
/* Wraps buffer in a frame and dispatches to subclass.
* Also manages data skipping and offset handling (including adapter flushing).
* Takes ownership of @buffer */
static GstFlowReturn
gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
gint * skip, gint * flushed)
{
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
GstBaseParseFrame *frame;
GstFlowReturn ret;
g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
GST_LOG_OBJECT (parse,
"handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
/* track what is being flushed during this single round of frame processing */
parse->priv->flushed = 0;
*skip = 0;
/* make it easy for _finish_frame to pick up input data */
if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
gst_buffer_ref (buffer);
gst_adapter_push (parse->priv->adapter, buffer);
}
frame = gst_base_parse_prepare_frame (parse, buffer);
ret = klass->handle_frame (parse, frame, skip);
*flushed = parse->priv->flushed;
GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
*skip, *flushed);
/* subclass can only do one of these, or semantics are too unclear */
g_assert (*skip == 0 || *flushed == 0);
/* track skipping */
if (*skip > 0) {
GstClockTime pts, dts;
GstBuffer *outbuf;
GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
/* reverse playback, and no frames found yet, so we are skipping
* the leading part of a fragment, which may form the tail of
* fragment coming later, hopefully subclass skips efficiently ... */
pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
outbuf = gst_buffer_make_writable (outbuf);
GST_BUFFER_PTS (outbuf) = pts;
GST_BUFFER_DTS (outbuf) = dts;
parse->priv->buffers_head =
g_slist_prepend (parse->priv->buffers_head, outbuf);
outbuf = NULL;
} else {
/* If we're asked to skip more than is available in the adapter,
we need to remember what we need to skip for next iteration */
gsize av = gst_adapter_available (parse->priv->adapter);
GST_DEBUG ("Asked to skip %u (%" G_GSIZE_FORMAT " available)", *skip, av);
if (av >= *skip) {
gst_adapter_flush (parse->priv->adapter, *skip);
} else {
GST_DEBUG
("This is more than available, flushing %" G_GSIZE_FORMAT
", storing %u to skip", av, (guint) (*skip - av));
parse->priv->skip = *skip - av;
gst_adapter_flush (parse->priv->adapter, av);
*skip = av;
}
}
if (!parse->priv->discont)
parse->priv->sync_offset = parse->priv->offset;
parse->priv->offset += *skip;
parse->priv->discont = TRUE;
/* check for indefinite skipping */
if (ret == GST_FLOW_OK)
ret = gst_base_parse_check_sync (parse);
}
parse->priv->offset += *flushed;
if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
gst_adapter_clear (parse->priv->adapter);
}
if (*skip == 0 && *flushed == 0) {
/* Carry over discont if we need more data */
if (GST_BUFFER_IS_DISCONT (frame->buffer))
parse->priv->discont = TRUE;
}
gst_base_parse_frame_free (frame);
return ret;
}
/* gst_base_parse_push_pending_events:
* @parse: #GstBaseParse
*
* Pushes the pending events
*/
static void
gst_base_parse_push_pending_events (GstBaseParse * parse)
{
if (G_UNLIKELY (parse->priv->pending_events)) {
GList *r = g_list_reverse (parse->priv->pending_events);
GList *l;
parse->priv->pending_events = NULL;
for (l = r; l != NULL; l = l->next) {
gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
}
g_list_free (r);
}
}
/* gst_base_parse_handle_and_push_frame:
* @parse: #GstBaseParse.
* @klass: #GstBaseParseClass.
* @frame: (transfer full): a #GstBaseParseFrame
*
* Parses the frame from given buffer and pushes it forward. Also performs
* timestamp handling and checks the segment limits.
*
* This is called with srcpad STREAM_LOCK held.
*
* Returns: #GstFlowReturn
*/
static GstFlowReturn
gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
GstBaseParseFrame * frame)
{
gint64 offset;
GstBuffer *buffer;
g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
buffer = frame->buffer;
offset = frame->offset;
/* check if subclass/format can provide ts.
* If so, that allows and enables extra seek and duration determining options */
if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
&& parse->priv->pad_mode == GST_PAD_MODE_PULL) {
parse->priv->first_frame_offset = offset;
parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
", pts %" GST_TIME_FORMAT " for first frame at offset %"
G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
GST_TIME_ARGS (parse->priv->first_frame_pts),
parse->priv->first_frame_offset);
if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
gint64 off;
GstClockTime last_ts = G_MAXINT64;
GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
gst_base_parse_locate_time (parse, &last_ts, &off);
if (GST_CLOCK_TIME_IS_VALID (last_ts))
gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
}
} else {
/* disable further checks */
parse->priv->first_frame_offset = 0;
}
}
/* track upstream time if provided, not subclass' internal notion of it */
if (parse->priv->upstream_format == GST_FORMAT_TIME) {
GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
}
/* interpolating and no valid pts yet,
* start with dts and carry on from there */
if (parse->priv->infer_ts && parse->priv->pts_interpolate
&& !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
parse->priv->next_pts = parse->priv->next_dts;
/* again use default handler to add missing metadata;
* we may have new information on frame properties */
gst_base_parse_parse_frame (parse, frame);
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
parse->priv->next_dts =
GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
GstClockTime next_pts =
GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
if (next_pts >= parse->priv->next_dts)
parse->priv->next_pts = next_pts;
}
} else {
/* we lost track, do not produce bogus time next time around
* (probably means parser subclass has given up on parsing as well) */
GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
parse->priv->next_dts = GST_CLOCK_TIME_NONE;
}
if (parse->priv->upstream_seekable && parse->priv->exact_position &&
GST_BUFFER_PTS_IS_VALID (buffer))
gst_base_parse_add_index_entry (parse, offset,
GST_BUFFER_PTS (buffer),
!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
/* All OK, push queued frames if there are any */
if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
GstBaseParseFrame *queued_frame;
while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
gst_base_parse_push_frame (parse, queued_frame);
gst_base_parse_frame_free (queued_frame);
}
}
return gst_base_parse_push_frame (parse, frame);
}
/**
* gst_base_parse_push_frame:
* @parse: #GstBaseParse.
* @frame: (transfer none): a #GstBaseParseFrame
*
* Pushes the frame's buffer downstream, sends any pending events and
* does some timestamp and segment handling. Takes ownership of
* frame's buffer, though caller retains ownership of @frame.
*
* This must be called with sinkpad STREAM_LOCK held.
*
* Returns: #GstFlowReturn
*/
GstFlowReturn
gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime last_start = GST_CLOCK_TIME_NONE;
GstClockTime last_stop = GST_CLOCK_TIME_NONE;
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
GstBuffer *buffer;
gsize size;
g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
buffer = frame->buffer;
GST_LOG_OBJECT (parse,
"processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
gst_buffer_get_size (buffer),
GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
/* update stats */
parse->priv->bytecount += frame->size;
if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
parse->priv->framecount++;
if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
}
}
/* 0 means disabled */
if (parse->priv->update_interval < 0)
parse->priv->update_interval = 50;
else if (parse->priv->update_interval > 0 &&
(parse->priv->framecount % parse->priv->update_interval) == 0)
gst_base_parse_update_duration (parse);
if (GST_BUFFER_PTS_IS_VALID (buffer))
last_start = last_stop = GST_BUFFER_PTS (buffer);
if (last_start != GST_CLOCK_TIME_NONE
&& GST_BUFFER_DURATION_IS_VALID (buffer))
last_stop = last_start + GST_BUFFER_DURATION (buffer);
/* should have caps by now */
if (!gst_pad_has_current_caps (parse->srcpad))
goto no_caps;
if (G_UNLIKELY (!parse->priv->checked_media)) {
/* have caps; check identity */
gst_base_parse_check_media (parse);
}
if (parse->priv->tags_changed) {
gst_base_parse_queue_tag_event_update (parse);
parse->priv->tags_changed = FALSE;
}
/* Push pending events, including SEGMENT events */
gst_base_parse_push_pending_events (parse);
/* segment adjustment magic; only if we are running the whole show */
if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
(parse->priv->pad_mode == GST_PAD_MODE_PULL ||
parse->priv->upstream_seekable)) {
/* handle gaps */
if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
GST_CLOCK_TIME_IS_VALID (last_start)) {
GstClockTimeDiff diff;
/* only send newsegments with increasing start times,
* otherwise if these go back and forth downstream (sinks) increase
* accumulated time and running_time */
diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
if (G_UNLIKELY (diff > 2 * GST_SECOND
&& last_start > parse->segment.start
&& (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
|| last_start < parse->segment.stop))) {
GstEvent *topush;
GST_DEBUG_OBJECT (parse,
"Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
"Sending updated SEGMENT events", diff,
GST_TIME_ARGS (parse->segment.position),
GST_TIME_ARGS (last_start));
/* skip gap FIXME */
topush = gst_event_new_segment (&parse->segment);
if (parse->priv->segment_seqnum != GST_SEQNUM_INVALID)
gst_event_set_seqnum (topush, parse->priv->segment_seqnum);
gst_pad_push_event (parse->srcpad, topush);
parse->segment.position = last_start;
}
}
}
/* update bitrates and optionally post corresponding tags
* (following newsegment) */
gst_base_parse_update_bitrates (parse, frame);
if (klass->pre_push_frame) {
ret = klass->pre_push_frame (parse, frame);
} else {
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
}
/* Push pending events, if there are any new ones
* like tags added by pre_push_frame */
if (parse->priv->tags_changed) {
gst_base_parse_queue_tag_event_update (parse);
parse->priv->tags_changed = FALSE;
}
gst_base_parse_push_pending_events (parse);
/* take final ownership of frame buffer */
if (frame->out_buffer) {
buffer = frame->out_buffer;
frame->out_buffer = NULL;
gst_buffer_replace (&frame->buffer, NULL);
} else {
buffer = frame->buffer;
frame->buffer = NULL;
}
/* subclass must play nice */
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
size = gst_buffer_get_size (buffer);
parse->priv->seen_keyframe |= parse->priv->is_video &&
!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
GST_BUFFER_TIMESTAMP (buffer) >
parse->segment.stop + parse->priv->lead_out_ts) {
GST_LOG_OBJECT (parse, "Dropped frame, after segment");
ret = GST_FLOW_EOS;
} else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
GST_BUFFER_DURATION_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
parse->priv->lead_in_ts < parse->segment.start) {
if (parse->priv->seen_keyframe) {
GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
ret = GST_FLOW_OK;
} else {
GST_LOG_OBJECT (parse, "Dropped frame, before segment");
ret = GST_BASE_PARSE_FLOW_DROPPED;
}
} else {
ret = GST_FLOW_OK;
}
}
if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
parse->priv->discont = TRUE;
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
} else if (ret == GST_FLOW_OK) {
if (parse->segment.rate > 0.0) {
GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
size);
ret = gst_pad_push (parse->srcpad, buffer);
GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
} else if (!parse->priv->disable_passthrough && parse->priv->passthrough) {
/* in backwards playback mode, if on passthrough we need to push buffers
* directly without accumulating them into the buffers_queued as baseparse
* will never check for a DISCONT while on passthrough and those buffers
* will never be pushed.
*
* also, as we are on reverse playback, it might be possible that
* passthrough might have just been enabled, so make sure to drain the
* buffers_queued list */
if (G_UNLIKELY (parse->priv->buffers_queued != NULL)) {
gst_base_parse_finish_fragment (parse, TRUE);
ret = gst_base_parse_send_buffers (parse);
}
if (ret == GST_FLOW_OK) {
GST_LOG_OBJECT (parse,
"pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size);
ret = gst_pad_push (parse->srcpad, buffer);
GST_LOG_OBJECT (parse, "frame pushed, flow %s",
gst_flow_get_name (ret));
} else {
GST_LOG_OBJECT (parse,
"frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size,
gst_flow_get_name (ret));
gst_buffer_unref (buffer);
}
} else {
GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
size);
parse->priv->buffers_queued =
g_slist_prepend (parse->priv->buffers_queued, buffer);
ret = GST_FLOW_OK;
}
} else {
GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
size, gst_flow_get_name (ret));
gst_buffer_unref (buffer);
/* if we are not sufficiently in control, let upstream decide on EOS */
if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
(parse->priv->passthrough ||
(parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
!parse->priv->upstream_seekable)))
ret = GST_FLOW_OK;
}
/* Update current running segment position */
if ((ret == GST_FLOW_OK || ret == GST_FLOW_NOT_LINKED)
&& last_stop != GST_CLOCK_TIME_NONE
&& parse->segment.position < last_stop)
parse->segment.position = last_stop;
return ret;
/* ERRORS */
no_caps:
{
if (GST_PAD_IS_FLUSHING (parse->srcpad))
return GST_FLOW_FLUSHING;
GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
return GST_FLOW_ERROR;
}
}
/**
* gst_base_parse_finish_frame:
* @parse: a #GstBaseParse
* @frame: a #GstBaseParseFrame
* @size: consumed input data represented by frame
*
* Collects parsed data and pushes this downstream.
* Source pad caps must be set when this is called.
*
* If @frame's out_buffer is set, that will be used as subsequent frame data.
* Otherwise, @size samples will be taken from the input and used for output,
* and the output's metadata (timestamps etc) will be taken as (optionally)
* set by the subclass on @frame's (input) buffer (which is otherwise
* ignored for any but the above purpose/information).
*
* Note that the latter buffer is invalidated by this call, whereas the
* caller retains ownership of @frame.
*
* Returns: a #GstFlowReturn that should be escalated to caller (of caller)
*/
GstFlowReturn
gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
gint size)
{
GstFlowReturn ret = GST_FLOW_OK;
g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
GST_FLOW_ERROR);
GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
"flushing size %d", frame->offset, size);
/* some one-time start-up */
if (G_UNLIKELY (parse->priv->framecount == 0)) {
gst_base_parse_check_seekability (parse);
gst_base_parse_check_upstream (parse);
}
parse->priv->flushed += size;
if (parse->priv->scanning && frame->buffer) {
if (!parse->priv->scanned_frame) {
parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
}
goto exit;
}
/* either PUSH or PULL mode arranges for adapter data */
/* ensure output buffer */
if (!frame->out_buffer) {
GstBuffer *src, *dest;
frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
dest = frame->out_buffer;
src = frame->buffer;
GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
} else {
gst_adapter_flush (parse->priv->adapter, size);
}
/* use as input for subsequent processing */
gst_buffer_replace (&frame->buffer, frame->out_buffer);
gst_buffer_unref (frame->out_buffer);
frame->out_buffer = NULL;
/* mark input size consumed */
frame->size = size;
/* subclass might queue frames/data internally if it needs more
* frames to decide on the format, or might request us to queue here. */
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
gst_buffer_replace (&frame->buffer, NULL);
goto exit;
} else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
GstBaseParseFrame *copy;
copy = gst_base_parse_frame_copy (frame);
copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
gst_base_parse_queue_frame (parse, copy);
goto exit;
}
ret = gst_base_parse_handle_and_push_frame (parse, frame);
exit:
return ret;
}
/**
* gst_base_parse_drain:
* @parse: a #GstBaseParse
*
* Drains the adapter until it is empty. It decreases the min_frame_size to
* match the current adapter size and calls chain method until the adapter
* is emptied or chain returns with error.
*
* Since: 1.12
*/
void
gst_base_parse_drain (GstBaseParse * parse)
{
guint avail;
GST_DEBUG_OBJECT (parse, "draining");
parse->priv->drain = TRUE;
for (;;) {
avail = gst_adapter_available (parse->priv->adapter);
if (!avail)
break;
if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
NULL) != GST_FLOW_OK) {
break;
}
/* nothing changed, maybe due to truncated frame; break infinite loop */
if (avail == gst_adapter_available (parse->priv->adapter)) {
GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
gst_adapter_clear (parse->priv->adapter);
}
}
parse->priv->drain = FALSE;
}
/* gst_base_parse_send_buffers
*
* Sends buffers collected in send_buffers downstream, and ensures that list
* is empty at the end (errors or not).
*/
static GstFlowReturn
gst_base_parse_send_buffers (GstBaseParse * parse)
{
GSList *send = NULL;
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
gboolean first = TRUE;
send = parse->priv->buffers_send;
/* send buffers */
while (send) {
buf = GST_BUFFER_CAST (send->data);
GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
", offset %" G_GINT64_FORMAT, buf,
GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
/* Make sure the first buffer is always DISCONT. If we split
* GOPs inside the parser this is otherwise not guaranteed */
if (first) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
first = FALSE;
} else {
/* likewise, subsequent buffers should never have DISCONT
* according to the "reverse fragment protocol", or such would
* confuse a downstream decoder
* (could be DISCONT due to aggregating upstream fragments by parsing) */
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
}
/* iterate output queue an push downstream */
ret = gst_pad_push (parse->srcpad, buf);
send = g_slist_delete_link (send, send);
/* clear any leftover if error */
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
while (send) {
buf = GST_BUFFER_CAST (send->data);
gst_buffer_unref (buf);
send = g_slist_delete_link (send, send);
}
}
}
parse->priv->buffers_send = send;
return ret;
}
/* gst_base_parse_start_fragment:
*
* Prepares for processing a reverse playback (forward) fragment
* by (re)setting proper state variables.
*/
static GstFlowReturn
gst_base_parse_start_fragment (GstBaseParse * parse)
{
GST_LOG_OBJECT (parse, "starting fragment");
/* invalidate so no fall-back timestamping is performed;
* ok if taken from subclass or upstream */
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
parse->priv->next_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts_from_pts = FALSE;
/* prevent it hanging around stop all the time */
parse->segment.position = GST_CLOCK_TIME_NONE;
/* mark next run */
parse->priv->discont = TRUE;
/* head of previous fragment is now pending tail of current fragment */
parse->priv->buffers_pending = parse->priv->buffers_head;
parse->priv->buffers_head = NULL;
return GST_FLOW_OK;
}
/* gst_base_parse_finish_fragment:
*
* Processes a reverse playback (forward) fragment:
* - append head of last fragment that was skipped to current fragment data
* - drain the resulting current fragment data (i.e. repeated chain)
* - add time/duration (if needed) to frames queued by chain
* - push queued data
*/
static GstFlowReturn
gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
{
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
gboolean seen_key = FALSE, seen_delta = FALSE;
GST_LOG_OBJECT (parse, "finishing fragment");
/* restore order */
parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
while (parse->priv->buffers_pending) {
buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
if (prev_head) {
GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
gst_buffer_get_size (buf));
gst_adapter_push (parse->priv->adapter, buf);
} else {
GST_LOG_OBJECT (parse, "discarding head buffer");
gst_buffer_unref (buf);
}
parse->priv->buffers_pending =
g_slist_delete_link (parse->priv->buffers_pending,
parse->priv->buffers_pending);
}
/* chain looks for frames and queues resulting ones (in stead of pushing) */
/* initial skipped data is added to buffers_pending */
gst_base_parse_drain (parse);
if (parse->priv->buffers_send) {
buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
}
/* add metadata (if needed to queued buffers */
GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
GST_TIME_ARGS (parse->priv->last_pts));
while (parse->priv->buffers_queued) {
buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
/* no touching if upstream or parsing provided time */
if (GST_BUFFER_PTS_IS_VALID (buf)) {
GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
} else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
else
parse->priv->last_pts = 0;
GST_BUFFER_PTS (buf) = parse->priv->last_pts;
GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
}
if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
else
parse->priv->last_dts = 0;
GST_BUFFER_DTS (buf) = parse->priv->last_dts;
GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
}
} else {
/* no idea, very bad */
GST_WARNING_OBJECT (parse, "could not determine time for buffer");
}
parse->priv->last_pts = GST_BUFFER_PTS (buf);
parse->priv->last_dts = GST_BUFFER_DTS (buf);
/* reverse order for ascending sending */
/* send downstream at keyframe not preceded by a keyframe
* (e.g. that should identify start of collection of IDR nals) */
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
if (seen_key) {
ret = gst_base_parse_send_buffers (parse);
/* if a problem, throw all to sending */
if (ret != GST_FLOW_OK) {
parse->priv->buffers_send =
g_slist_reverse (parse->priv->buffers_queued);
parse->priv->buffers_queued = NULL;
break;
}
seen_key = FALSE;
}
seen_delta = TRUE;
} else {
seen_key = TRUE;
}
parse->priv->buffers_send =
g_slist_prepend (parse->priv->buffers_send, buf);
parse->priv->buffers_queued =
g_slist_delete_link (parse->priv->buffers_queued,
parse->priv->buffers_queued);
}
/* audio may have all marked as keyframe, so arrange to send here. Also
* we might have ended the loop above on a keyframe, in which case we
* should */
if (!seen_delta || seen_key)
ret = gst_base_parse_send_buffers (parse);
/* any trailing unused no longer usable (ideally none) */
if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
gst_adapter_available (parse->priv->adapter));
gst_adapter_clear (parse->priv->adapter);
}
return ret;
}
/* small helper that checks whether we have been trying to resync too long */
static inline GstFlowReturn
gst_base_parse_check_sync (GstBaseParse * parse)
{
if (G_UNLIKELY (parse->priv->discont &&
parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
GST_ELEMENT_ERROR (parse, STREAM, DECODE,
("Failed to parse stream"), (NULL));
return GST_FLOW_ERROR;
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_base_parse_process_streamheader (GstBaseParse * parse)
{
GstCaps *caps;
GstStructure *str;
const GValue *value;
GstFlowReturn ret = GST_FLOW_OK;
caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
if (caps == NULL)
goto notfound;
str = gst_caps_get_structure (caps, 0);
value = gst_structure_get_value (str, "streamheader");
if (value == NULL)
goto notfound;
GST_DEBUG_OBJECT (parse, "Found streamheader field on input caps");
if (GST_VALUE_HOLDS_ARRAY (value)) {
gint i;
gsize len = gst_value_array_get_size (value);
for (i = 0; i < len; i++) {
GstBuffer *buffer =
gst_value_get_buffer (gst_value_array_get_value (value, i));
ret =
gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
}
} else if (GST_VALUE_HOLDS_BUFFER (value)) {
GstBuffer *buffer = gst_value_get_buffer (value);
ret =
gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
}
gst_caps_unref (caps);
return ret;
notfound:
{
if (caps) {
gst_caps_unref (caps);
}
GST_DEBUG_OBJECT (parse, "No streamheader on caps");
return GST_FLOW_OK;
}
}
static GstFlowReturn
gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstBaseParseClass *bclass;
GstBaseParse *parse;
GstFlowReturn ret = GST_FLOW_OK;
GstFlowReturn old_ret = GST_FLOW_OK;
GstBuffer *tmpbuf = NULL;
guint fsize = 1;
gint skip = -1;
guint min_size, av;
GstClockTime pts, dts;
parse = GST_BASE_PARSE (parent);
bclass = GST_BASE_PARSE_GET_CLASS (parse);
GST_DEBUG_OBJECT (parent, "chain");
/* early out for speed, if we need to skip */
if (buffer && GST_BUFFER_IS_DISCONT (buffer))
parse->priv->skip = 0;
if (parse->priv->skip > 0) {
gsize bsize = gst_buffer_get_size (buffer);
GST_DEBUG ("Got %" G_GSIZE_FORMAT " buffer, need to skip %u", bsize,
parse->priv->skip);
if (parse->priv->skip >= bsize) {
parse->priv->skip -= bsize;
GST_DEBUG ("All the buffer is skipped");
parse->priv->offset += bsize;
parse->priv->sync_offset = parse->priv->offset;
return GST_FLOW_OK;
}
buffer = gst_buffer_make_writable (buffer);
gst_buffer_resize (buffer, parse->priv->skip, bsize - parse->priv->skip);
parse->priv->offset += parse->priv->skip;
GST_DEBUG ("Done skipping, we have %u left on this buffer",
(unsigned) (bsize - parse->priv->skip));
parse->priv->skip = 0;
parse->priv->discont = TRUE;
}
if (G_UNLIKELY (parse->priv->first_buffer)) {
parse->priv->first_buffer = FALSE;
if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_HEADER)) {
/* this stream has no header buffers, check if we just prepend the
* streamheader from caps to the stream */
GST_DEBUG_OBJECT (parse, "Looking for streamheader field on caps to "
"prepend to the stream");
gst_base_parse_process_streamheader (parse);
} else {
GST_DEBUG_OBJECT (parse, "Stream has header buffers, not prepending "
"streamheader from caps");
}
}
if (parse->priv->detecting) {
GstBuffer *detect_buf;
if (parse->priv->detect_buffers_size == 0) {
detect_buf = gst_buffer_ref (buffer);
} else {
GList *l;
guint offset = 0;
detect_buf = gst_buffer_new ();
for (l = parse->priv->detect_buffers; l; l = l->next) {
gsize tmpsize = gst_buffer_get_size (l->data);
gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
GST_BUFFER_COPY_MEMORY, offset, tmpsize);
offset += tmpsize;
}
if (buffer)
gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
offset, gst_buffer_get_size (buffer));
}
ret = bclass->detect (parse, detect_buf);
gst_buffer_unref (detect_buf);
if (ret == GST_FLOW_OK) {
GList *l;
/* Detected something */
parse->priv->detecting = FALSE;
for (l = parse->priv->detect_buffers; l; l = l->next) {
if (ret == GST_FLOW_OK && !parse->priv->flushing)
ret =
gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
parent, GST_BUFFER_CAST (l->data));
else
gst_buffer_unref (GST_BUFFER_CAST (l->data));
}
g_list_free (parse->priv->detect_buffers);
parse->priv->detect_buffers = NULL;
parse->priv->detect_buffers_size = 0;
if (ret != GST_FLOW_OK) {
return ret;
}
/* Handle the current buffer */
} else if (ret == GST_FLOW_NOT_NEGOTIATED) {
/* Still detecting, append buffer or error out if draining */
if (parse->priv->drain) {
GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
return GST_FLOW_ERROR;
} else if (parse->priv->flushing) {
g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
NULL);
g_list_free (parse->priv->detect_buffers);
parse->priv->detect_buffers = NULL;
parse->priv->detect_buffers_size = 0;
} else {
parse->priv->detect_buffers =
g_list_append (parse->priv->detect_buffers, buffer);
parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
return GST_FLOW_OK;
}
} else {
/* Something went wrong, subclass responsible for error reporting */
return ret;
}
/* And now handle the current buffer if detection worked */
}
if (G_LIKELY (buffer)) {
GST_LOG_OBJECT (parse,
"buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
if (G_UNLIKELY (!parse->priv->disable_passthrough
&& parse->priv->passthrough)) {
GstBaseParseFrame frame;
gst_base_parse_frame_init (&frame);
frame.buffer = gst_buffer_make_writable (buffer);
ret = gst_base_parse_push_frame (parse, &frame);
gst_base_parse_frame_free (&frame);
return ret;
}
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
/* upstream feeding us in reverse playback;
* finish previous fragment and start new upon DISCONT */
if (parse->segment.rate < 0.0) {
GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
ret = gst_base_parse_finish_fragment (parse, TRUE);
gst_base_parse_start_fragment (parse);
} else {
/* discont in the stream, drain and mark discont for next output */
gst_base_parse_drain (parse);
parse->priv->discont = TRUE;
}
}
gst_adapter_push (parse->priv->adapter, buffer);
}
/* Parse and push as many frames as possible */
/* Stop either when adapter is empty or we are flushing */
while (!parse->priv->flushing) {
gint flush = 0;
gboolean updated_prev_pts = FALSE;
/* note: if subclass indicates MAX fsize,
* this will not likely be available anyway ... */
min_size = MAX (parse->priv->min_frame_size, fsize);
av = gst_adapter_available (parse->priv->adapter);
if (G_UNLIKELY (parse->priv->drain)) {
min_size = av;
GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
if (G_UNLIKELY (!min_size)) {
goto done;
}
}
/* Collect at least min_frame_size bytes */
if (av < min_size) {
GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
goto done;
}
/* move along with upstream timestamp (if any),
* but interpolate in between */
pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts)) {
parse->priv->prev_pts = parse->priv->next_pts = pts;
updated_prev_pts = TRUE;
}
if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts)) {
parse->priv->prev_dts = parse->priv->next_dts = dts;
parse->priv->prev_dts_from_pts = FALSE;
}
/* we can mess with, erm interpolate, timestamps,
* and incoming stuff has PTS but no DTS seen so far,
* then pick up DTS from PTS and hope for the best ... */
if (parse->priv->infer_ts &&
parse->priv->pts_interpolate &&
!GST_CLOCK_TIME_IS_VALID (dts) &&
(!GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts)
|| (parse->priv->prev_dts_from_pts && updated_prev_pts))
&& GST_CLOCK_TIME_IS_VALID (pts)) {
parse->priv->prev_dts = parse->priv->next_dts = pts;
parse->priv->prev_dts_from_pts = TRUE;
}
/* always pass all available data */
tmpbuf = gst_adapter_get_buffer (parse->priv->adapter, av);
/* already inform subclass what timestamps we have planned,
* at least if provided by time-based upstream */
if (parse->priv->upstream_format == GST_FORMAT_TIME) {
tmpbuf = gst_buffer_make_writable (tmpbuf);
GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
GST_BUFFER_DURATION (tmpbuf) = GST_CLOCK_TIME_NONE;
}
/* keep the adapter mapped, so keep track of what has to be flushed */
ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
tmpbuf = NULL;
if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
goto done;
}
if (skip == 0 && flush == 0) {
GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
"breaking to get more data");
/* ignore this return as it produced no data */
ret = old_ret;
goto done;
}
if (old_ret == GST_FLOW_OK)
old_ret = ret;
}
done:
GST_LOG_OBJECT (parse, "chain leaving");
return ret;
}
/* pull @size bytes at current offset,
* i.e. at least try to and possibly return a shorter buffer if near the end */
static GstFlowReturn
gst_base_parse_pull_range (GstBaseParse * parse, guint size,
GstBuffer ** buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
/* Caching here actually makes much less difference than one would expect.
* We do it mainly to avoid pulling buffers of 1 byte all the time */
if (parse->priv->cache) {
gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
gint cache_size = gst_buffer_get_size (parse->priv->cache);
if (cache_offset <= parse->priv->offset &&
(parse->priv->offset + size) <= (cache_offset + cache_size)) {
*buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
parse->priv->offset - cache_offset, size);
GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
return GST_FLOW_OK;
}
/* not enough data in the cache, free cache and get a new one */
gst_buffer_unref (parse->priv->cache);
parse->priv->cache = NULL;
}
/* refill the cache */
ret =
gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
64 * 1024), &parse->priv->cache);
if (ret != GST_FLOW_OK) {
parse->priv->cache = NULL;
return ret;
}
if (gst_buffer_get_size (parse->priv->cache) < size) {
GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
*buffer = parse->priv->cache;
parse->priv->cache = NULL;
return GST_FLOW_OK;
}
*buffer =
gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
{
gint64 offset = 0;
GstClockTime ts = 0;
GstBuffer *buffer;
GstFlowReturn ret;
GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
", last_offset = %" G_GINT64_FORMAT,
GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
if (!parse->priv->last_offset
|| parse->priv->last_pts <= parse->segment.start) {
GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
GST_TIME_ARGS (parse->segment.start));
ret = GST_FLOW_EOS;
goto exit;
}
/* last fragment started at last_offset / last_ts;
* seek back 10s capped at 1MB */
if (parse->priv->last_pts >= 10 * GST_SECOND)
ts = parse->priv->last_pts - 10 * GST_SECOND;
/* if we are exact now, we will be more so going backwards */
if (parse->priv->exact_position) {
offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
} else {
if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
GST_FORMAT_BYTES, &offset)) {
GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
}
}
offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
parse->priv->last_offset - 1024);
offset = MAX (0, offset);
GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
offset);
parse->priv->offset = offset;
ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
&buffer);
if (ret != GST_FLOW_OK)
goto exit;
/* offset will increase again as fragment is processed/parsed */
parse->priv->last_offset = offset;
gst_base_parse_start_fragment (parse);
gst_adapter_push (parse->priv->adapter, buffer);
ret = gst_base_parse_finish_fragment (parse, TRUE);
if (ret != GST_FLOW_OK)
goto exit;
/* force previous fragment */
parse->priv->offset = -1;
exit:
return ret;
}
/* PULL mode:
* pull and scan for next frame starting from current offset
* ajusts sync, drain and offset going along */
static GstFlowReturn
gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
{
GstBuffer *buffer;
GstFlowReturn ret = GST_FLOW_OK;
guint fsize, min_size;
gint flushed = 0;
gint skip = 0;
GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
" (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
/* let's make this efficient for all subclass once and for all;
* maybe it does not need this much, but in the latter case, we know we are
* in pull mode here and might as well try to read and supply more anyway
* (so does the buffer caching mechanism) */
fsize = 64 * 1024;
while (TRUE) {
min_size = MAX (parse->priv->min_frame_size, fsize);
GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
ret = gst_base_parse_pull_range (parse, min_size, &buffer);
if (ret != GST_FLOW_OK)
goto done;
/* if we got a short read, inform subclass we are draining leftover
* and no more is to be expected */
if (gst_buffer_get_size (buffer) < min_size) {
GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
parse->priv->drain = TRUE;
}
if (parse->priv->detecting) {
ret = klass->detect (parse, buffer);
if (ret == GST_FLOW_NOT_NEGOTIATED) {
/* If draining we error out, otherwise request a buffer
* with 64kb more */
if (parse->priv->drain) {
gst_buffer_unref (buffer);
GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
return GST_FLOW_ERROR;
} else {
fsize += 64 * 1024;
gst_buffer_unref (buffer);
continue;
}
} else if (ret != GST_FLOW_OK) {
gst_buffer_unref (buffer);
GST_ERROR_OBJECT (parse, "detect() returned %s",
gst_flow_get_name (ret));
return ret;
}
/* Else handle this buffer normally */
}
ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
if (ret != GST_FLOW_OK)
break;
/* If a large amount of data was requested to be skipped, _handle_buffer
might have set the priv->skip flag to an extra amount on top of skip.
In pull mode, we can just pull from the new offset directly. */
parse->priv->offset += parse->priv->skip;
parse->priv->skip = 0;
/* something flushed means something happened,
* and we should bail out of this loop so as not to occupy
* the task thread indefinitely */
if (flushed) {
GST_LOG_OBJECT (parse, "frame finished, breaking loop");
break;
}
/* nothing flushed, no skip and draining, so nothing left to do */
if (!skip && parse->priv->drain) {
GST_LOG_OBJECT (parse, "no activity or result when draining; "
"breaking loop and marking EOS");
ret = GST_FLOW_EOS;
break;
}
/* otherwise, get some more data
* note that is checked this does not happen indefinitely */
if (!skip) {
GST_LOG_OBJECT (parse, "getting some more data");
fsize += 64 * 1024;
}
parse->priv->drain = FALSE;
}
done:
return ret;
}
/* Loop that is used in pull mode to retrieve data from upstream */
static void
gst_base_parse_loop (GstPad * pad)
{
GstBaseParse *parse;
GstBaseParseClass *klass;
GstFlowReturn ret = GST_FLOW_OK;
parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
klass = GST_BASE_PARSE_GET_CLASS (parse);
GST_LOG_OBJECT (parse, "Entering parse loop");
if (G_UNLIKELY (parse->priv->push_stream_start)) {
gchar *stream_id;
GstEvent *event;
stream_id =
gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
NULL);
event = gst_event_new_stream_start (stream_id);
gst_event_set_group_id (event, gst_util_group_id_next ());
GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
gst_pad_push_event (parse->srcpad, event);
parse->priv->push_stream_start = FALSE;
g_free (stream_id);
}
/* reverse playback:
* first fragment (closest to stop time) is handled normally below,
* then we pull in fragments going backwards */
if (parse->segment.rate < 0.0) {
/* check if we jumped back to a previous fragment,
* which is a post-first fragment */
if (parse->priv->offset < 0) {
ret = gst_base_parse_handle_previous_fragment (parse);
goto done;
}
}
ret = gst_base_parse_scan_frame (parse, klass);
/* eat expected eos signalling past segment in reverse playback */
if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
parse->segment.position >= parse->segment.stop) {
GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
/* push what was accumulated during loop run */
gst_base_parse_finish_fragment (parse, FALSE);
/* force previous fragment */
parse->priv->offset = -1;
goto eos;
}
if (ret != GST_FLOW_OK)
goto done;
done:
if (ret == GST_FLOW_EOS)
goto eos;
else if (ret != GST_FLOW_OK)
goto pause;
gst_object_unref (parse);
return;
/* ERRORS */
eos:
{
ret = GST_FLOW_EOS;
GST_DEBUG_OBJECT (parse, "eos");
/* fall-through */
}
pause:
{
gboolean push_eos = FALSE;
GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
gst_flow_get_name (ret));
gst_pad_pause_task (parse->sinkpad);
if (ret == GST_FLOW_EOS) {
/* handle end-of-stream/segment */
if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
gint64 stop;
if ((stop = parse->segment.stop) == -1)
stop = parse->segment.duration;
GST_DEBUG_OBJECT (parse, "sending segment_done");
gst_element_post_message
(GST_ELEMENT_CAST (parse),
gst_message_new_segment_done (GST_OBJECT_CAST (parse),
GST_FORMAT_TIME, stop));
gst_pad_push_event (parse->srcpad,
gst_event_new_segment_done (GST_FORMAT_TIME, stop));
} else {
/* If we STILL have zero frames processed, fire an error */
if (parse->priv->framecount == 0) {
GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
("No valid frames found before end of stream"), (NULL));
}
push_eos = TRUE;
}
} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
/* for fatal errors we post an error message, wrong-state is
* not fatal because it happens due to flushes and only means
* that we should stop now. */
GST_ELEMENT_FLOW_ERROR (parse, ret);
push_eos = TRUE;
}
if (push_eos) {
GstEvent *topush;
if (parse->priv->estimated_duration <= 0) {
gst_base_parse_update_duration (parse);
}
/* Push pending events, including SEGMENT events */
gst_base_parse_push_pending_events (parse);
topush = gst_event_new_eos ();
GST_DEBUG_OBJECT (parse, "segment_seqnum:%" G_GUINT32_FORMAT,
parse->priv->segment_seqnum);
if (parse->priv->segment_seqnum != GST_SEQNUM_INVALID)
gst_event_set_seqnum (topush, parse->priv->segment_seqnum);
gst_pad_push_event (parse->srcpad, topush);
}
gst_object_unref (parse);
}
}
static gboolean
gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
{
GstSchedulingFlags sched_flags;
GstBaseParse *parse;
GstQuery *query;
gboolean pull_mode;
parse = GST_BASE_PARSE (parent);
GST_DEBUG_OBJECT (parse, "sink activate");
query = gst_query_new_scheduling ();
if (!gst_pad_peer_query (sinkpad, query)) {
gst_query_unref (query);
goto baseparse_push;
}
gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
&& ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
gst_query_unref (query);
if (!pull_mode)
goto baseparse_push;
GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
goto baseparse_push;
parse->priv->push_stream_start = TRUE;
/* In pull mode, upstream is BYTES */
parse->priv->upstream_format = GST_FORMAT_BYTES;
return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
sinkpad, NULL);
/* fallback */
baseparse_push:
{
GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
}
}
static gboolean
gst_base_parse_activate (GstBaseParse * parse, gboolean active)
{
GstBaseParseClass *klass;
gboolean result = TRUE;
GST_DEBUG_OBJECT (parse, "activate %d", active);
klass = GST_BASE_PARSE_GET_CLASS (parse);
if (active) {
if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
result = klass->start (parse);
/* If the subclass implements ::detect we want to
* call it for the first buffers now */
parse->priv->detecting = (klass->detect != NULL);
} else {
/* We must make sure streaming has finished before resetting things
* and calling the ::stop vfunc */
GST_PAD_STREAM_LOCK (parse->sinkpad);
GST_PAD_STREAM_UNLOCK (parse->sinkpad);
if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
result = klass->stop (parse);
parse->priv->pad_mode = GST_PAD_MODE_NONE;
parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
}
GST_DEBUG_OBJECT (parse, "activate return: %d", result);
return result;
}
static gboolean
gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result;
GstBaseParse *parse;
parse = GST_BASE_PARSE (parent);
GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
(active) ? "" : "de", gst_pad_mode_get_name (mode));
if (!gst_base_parse_activate (parse, active))
goto activate_failed;
switch (mode) {
case GST_PAD_MODE_PULL:
if (active) {
GstEvent *ev = gst_event_new_segment (&parse->segment);
parse->priv->segment_seqnum = gst_event_get_seqnum (ev);
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events, ev);
result = TRUE;
} else {
result = gst_pad_stop_task (pad);
}
break;
default:
result = TRUE;
break;
}
if (result)
parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
return result;
/* ERRORS */
activate_failed:
{
GST_DEBUG_OBJECT (parse, "activate failed");
return FALSE;
}
}
/**
* gst_base_parse_set_duration:
* @parse: #GstBaseParse.
* @fmt: #GstFormat.
* @duration: duration value.
* @interval: how often to update the duration estimate based on bitrate, or 0.
*
* Sets the duration of the currently playing media. Subclass can use this
* when it is able to determine duration and/or notices a change in the media
* duration. Alternatively, if @interval is non-zero (default), then stream
* duration is determined based on estimated bitrate, and updated every @interval
* frames.
*/
void
gst_base_parse_set_duration (GstBaseParse * parse,
GstFormat fmt, gint64 duration, gint interval)
{
g_return_if_fail (parse != NULL);
if (parse->priv->upstream_has_duration) {
GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
goto exit;
}
if (duration != parse->priv->duration) {
GstMessage *m;
m = gst_message_new_duration_changed (GST_OBJECT (parse));
gst_element_post_message (GST_ELEMENT (parse), m);
/* TODO: what about duration tag? */
}
parse->priv->duration = duration;
parse->priv->duration_fmt = fmt;
GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
if (interval != 0) {
GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
interval = 0;
}
}
GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
parse->priv->update_interval = interval;
exit:
return;
}
/**
* gst_base_parse_set_average_bitrate:
* @parse: #GstBaseParse.
* @bitrate: average bitrate in bits/second
*
* Optionally sets the average bitrate detected in media (if non-zero),
* e.g. based on metadata, as it will be posted to the application.
*
* By default, announced average bitrate is estimated. The average bitrate
* is used to estimate the total duration of the stream and to estimate
* a seek position, if there's no index and the format is syncable
* (see gst_base_parse_set_syncable()).
*/
void
gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
{
parse->priv->bitrate = bitrate;
GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
}
/**
* gst_base_parse_set_min_frame_size:
* @parse: #GstBaseParse.
* @min_size: Minimum size in bytes of the data that this base class should
* give to subclass.
*
* Subclass can use this function to tell the base class that it needs to
* be given buffers of at least @min_size bytes.
*/
void
gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
{
g_return_if_fail (parse != NULL);
parse->priv->min_frame_size = min_size;
GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
}
/**
* gst_base_parse_set_frame_rate:
* @parse: the #GstBaseParse to set
* @fps_num: frames per second (numerator).
* @fps_den: frames per second (denominator).
* @lead_in: frames needed before a segment for subsequent decode
* @lead_out: frames needed after a segment
*
* If frames per second is configured, parser can take care of buffer duration
* and timestamping. When performing segment clipping, or seeking to a specific
* location, a corresponding decoder might need an initial @lead_in and a
* following @lead_out number of frames to ensure the desired segment is
* entirely filled upon decoding.
*/
void
gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
guint fps_den, guint lead_in, guint lead_out)
{
g_return_if_fail (parse != NULL);
parse->priv->fps_num = fps_num;
parse->priv->fps_den = fps_den;
if (!fps_num || !fps_den) {
GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
fps_num, fps_den);
fps_num = fps_den = 0;
parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
parse->priv->lead_in = parse->priv->lead_out = 0;
parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
} else {
parse->priv->frame_duration =
gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
parse->priv->lead_in = lead_in;
parse->priv->lead_out = lead_out;
parse->priv->lead_in_ts =
gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
parse->priv->lead_out_ts =
gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
/* aim for about 1.5s to estimate duration */
if (parse->priv->update_interval < 0) {
guint64 interval = gst_util_uint64_scale (fps_num, 3,
G_GUINT64_CONSTANT (2) * fps_den);
parse->priv->update_interval = MIN (interval, G_MAXINT);
GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
parse->priv->update_interval);
}
}
GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
"lead out: %d frames = %" G_GUINT64_FORMAT " ms",
lead_in, parse->priv->lead_in_ts / GST_MSECOND,
lead_out, parse->priv->lead_out_ts / GST_MSECOND);
}
/**
* gst_base_parse_set_has_timing_info:
* @parse: a #GstBaseParse
* @has_timing: whether frames carry timing information
*
* Set if frames carry timing information which the subclass can (generally)
* parse and provide. In particular, intrinsic (rather than estimated) time
* can be obtained following a seek.
*/
void
gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
{
parse->priv->has_timing_info = has_timing;
GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
}
/**
* gst_base_parse_set_syncable:
* @parse: a #GstBaseParse
* @syncable: set if frame starts can be identified
*
* Set if frame starts can be identified. This is set by default and
* determines whether seeking based on bitrate averages
* is possible for a format/stream.
*/
void
gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
{
parse->priv->syncable = syncable;
GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
}
/**
* gst_base_parse_set_passthrough:
* @parse: a #GstBaseParse
* @passthrough: %TRUE if parser should run in passthrough mode
*
* Set if the nature of the format or configuration does not allow (much)
* parsing, and the parser should operate in passthrough mode (which only
* applies when operating in push mode). That is, incoming buffers are
* pushed through unmodified, i.e. no #GstBaseParseClass.handle_frame()
* will be invoked, but #GstBaseParseClass.pre_push_frame() will still be
* invoked, so subclass can perform as much or as little is appropriate for
* passthrough semantics in #GstBaseParseClass.pre_push_frame().
*/
void
gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
{
parse->priv->passthrough = passthrough;
GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
}
/**
* gst_base_parse_set_pts_interpolation:
* @parse: a #GstBaseParse
* @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
*
* By default, the base class will guess PTS timestamps using a simple
* interpolation (previous timestamp + duration), which is incorrect for
* data streams with reordering, where PTS can go backward. Sub-classes
* implementing such formats should disable PTS interpolation.
*/
void
gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
gboolean pts_interpolate)
{
parse->priv->pts_interpolate = pts_interpolate;
GST_INFO_OBJECT (parse, "PTS interpolation: %s",
(pts_interpolate) ? "yes" : "no");
}
/**
* gst_base_parse_set_infer_ts:
* @parse: a #GstBaseParse
* @infer_ts: %TRUE if parser should infer DTS/PTS from each other
*
* By default, the base class might try to infer PTS from DTS and vice
* versa. While this is generally correct for audio data, it may not
* be otherwise. Sub-classes implementing such formats should disable
* timestamp inferring.
*/
void
gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
{
parse->priv->infer_ts = infer_ts;
GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
}
/**
* gst_base_parse_set_latency:
* @parse: a #GstBaseParse
* @min_latency: minimum parse latency
* @max_latency: maximum parse latency
*
* Sets the minimum and maximum (which may likely be equal) latency introduced
* by the parsing process. If there is such a latency, which depends on the
* particular parsing of the format, it typically corresponds to 1 frame duration.
*/
void
gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
GstClockTime max_latency)
{
g_return_if_fail (min_latency != GST_CLOCK_TIME_NONE);
g_return_if_fail (min_latency <= max_latency);
GST_OBJECT_LOCK (parse);
parse->priv->min_latency = min_latency;
parse->priv->max_latency = max_latency;
GST_OBJECT_UNLOCK (parse);
GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
GST_TIME_ARGS (max_latency));
}
static gboolean
gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
GstClockTime * duration)
{
gboolean res = FALSE;
g_return_val_if_fail (duration != NULL, FALSE);
*duration = GST_CLOCK_TIME_NONE;
if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
GST_LOG_OBJECT (parse, "using provided duration");
*duration = parse->priv->duration;
res = TRUE;
} else if (parse->priv->duration != -1) {
GST_LOG_OBJECT (parse, "converting provided duration");
res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
parse->priv->duration, format, (gint64 *) duration);
} else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
GST_LOG_OBJECT (parse, "using estimated duration");
*duration = parse->priv->estimated_duration;
res = TRUE;
} else {
GST_LOG_OBJECT (parse, "cannot estimate duration");
}
GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
GST_TIME_ARGS (*duration));
return res;
}
static gboolean
gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
{
gboolean res = FALSE;
GstPad *pad;
pad = GST_BASE_PARSE_SRC_PAD (parse);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 dest_value;
GstFormat format;
GST_DEBUG_OBJECT (parse, "position query");
gst_query_parse_position (query, &format, NULL);
/* try upstream first */
res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
if (!res) {
/* Fall back on interpreting segment */
GST_OBJECT_LOCK (parse);
/* Only reply BYTES if upstream is in BYTES already, otherwise
* we're not in charge */
if (format == GST_FORMAT_BYTES
&& parse->priv->upstream_format == GST_FORMAT_BYTES) {
dest_value = parse->priv->offset;
res = TRUE;
} else if (format == parse->segment.format &&
GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
dest_value = gst_segment_to_stream_time (&parse->segment,
parse->segment.format, parse->segment.position);
res = TRUE;
}
GST_OBJECT_UNLOCK (parse);
if (!res && parse->priv->upstream_format == GST_FORMAT_BYTES) {
/* no precise result, upstream no idea either, then best estimate */
/* priv->offset is updated in both PUSH/PULL modes, *iff* we're
* in charge of things */
res = gst_base_parse_convert (parse,
GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
}
if (res)
gst_query_set_position (query, format, dest_value);
}
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstClockTime duration;
GST_DEBUG_OBJECT (parse, "duration query");
gst_query_parse_duration (query, &format, NULL);
/* consult upstream */
res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
/* otherwise best estimate from us */
if (!res) {
res = gst_base_parse_get_duration (parse, format, &duration);
if (res)
gst_query_set_duration (query, format, duration);
}
break;
}
case GST_QUERY_SEEKING:
{
GstFormat fmt;
GstClockTime duration = GST_CLOCK_TIME_NONE;
gboolean seekable = FALSE;
GST_DEBUG_OBJECT (parse, "seeking query");
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
/* consult upstream */
res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
/* we may be able to help if in TIME */
if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
/* already OK if upstream takes care */
GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
res, seekable);
if (!(res && seekable)) {
if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
|| duration == -1) {
/* seekable if we still have a chance to get duration later on */
seekable = parse->priv->upstream_seekable &&
(parse->priv->update_interval > 0);
} else {
seekable = parse->priv->upstream_seekable;
GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
seekable);
}
gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
res = TRUE;
}
}
break;
}
case GST_QUERY_FORMATS:
gst_query_set_formatsv (query, 3, fmtlist);
res = TRUE;
break;
case GST_QUERY_CONVERT:
{
GstFormat src_format, dest_format;
gint64 src_value, dest_value;
gst_query_parse_convert (query, &src_format, &src_value,
&dest_format, &dest_value);
res = gst_base_parse_convert (parse, src_format, src_value,
dest_format, &dest_value);
if (res) {
gst_query_set_convert (query, src_format, src_value,
dest_format, dest_value);
}
break;
}
case GST_QUERY_LATENCY:
{
if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
gboolean live;
GstClockTime min_latency, max_latency;
gst_query_parse_latency (query, &live, &min_latency, &max_latency);
GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
GST_OBJECT_LOCK (parse);
/* add our latency */
min_latency += parse->priv->min_latency;
if (max_latency == -1 || parse->priv->max_latency == -1)
max_latency = -1;
else
max_latency += parse->priv->max_latency;
GST_OBJECT_UNLOCK (parse);
gst_query_set_latency (query, live, min_latency, max_latency);
}
break;
}
case GST_QUERY_SEGMENT:
{
GstFormat format;
gint64 start, stop;
format = parse->segment.format;
start =
gst_segment_to_stream_time (&parse->segment, format,
parse->segment.start);
if ((stop = parse->segment.stop) == -1)
stop = parse->segment.duration;
else
stop = gst_segment_to_stream_time (&parse->segment, format, stop);
gst_query_set_segment (query, parse->segment.rate, format, start, stop);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
break;
}
return res;
}
/* scans for a cluster start from @pos,
* return GST_FLOW_OK and frame position/time in @pos/@time if found */
static GstFlowReturn
gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
GstClockTime * time, GstClockTime * duration)
{
GstBaseParseClass *klass;
gint64 orig_offset;
gboolean orig_drain, orig_discont;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf = NULL;
GstBaseParseFrame *sframe = NULL;
g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
klass = GST_BASE_PARSE_GET_CLASS (parse);
*time = GST_CLOCK_TIME_NONE;
*duration = GST_CLOCK_TIME_NONE;
/* save state */
orig_offset = parse->priv->offset;
orig_discont = parse->priv->discont;
orig_drain = parse->priv->drain;
GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
" (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
/* jump elsewhere and locate next frame */
parse->priv->offset = *pos;
/* mark as scanning so frames don't get processed all the way */
parse->priv->scanning = TRUE;
ret = gst_base_parse_scan_frame (parse, klass);
parse->priv->scanning = FALSE;
/* retrieve frame found during scan */
sframe = parse->priv->scanned_frame;
parse->priv->scanned_frame = NULL;
if (ret != GST_FLOW_OK || !sframe)
goto done;
/* get offset first, subclass parsing might dump other stuff in there */
*pos = sframe->offset;
buf = sframe->buffer;
g_assert (buf);
/* but it should provide proper time */
*time = GST_BUFFER_TIMESTAMP (buf);
*duration = GST_BUFFER_DURATION (buf);
GST_LOG_OBJECT (parse,
"frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
GST_TIME_ARGS (*time), *pos);
done:
if (sframe)
gst_base_parse_frame_free (sframe);
/* restore state */
parse->priv->offset = orig_offset;
parse->priv->discont = orig_discont;
parse->priv->drain = orig_drain;
return ret;
}
/* bisect and scan through file for frame starting before @time,
* returns OK and @time/@offset if found, NONE and/or error otherwise
* If @time == G_MAXINT64, scan for duration ( == last frame) */
static GstFlowReturn
gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
gint64 * _offset)
{
GstFlowReturn ret = GST_FLOW_OK;
gint64 lpos, hpos, newpos;
GstClockTime time, ltime, htime, newtime, dur;
gboolean cont = TRUE;
const GstClockTime tolerance = TARGET_DIFFERENCE;
const guint chunk = 4 * 1024;
g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
GST_TIME_ARGS (*_time));
/* TODO also make keyframe aware if useful some day */
time = *_time;
/* basic cases */
if (time == 0) {
*_offset = 0;
return GST_FLOW_OK;
}
if (time == -1) {
*_offset = -1;
return GST_FLOW_OK;
}
/* do not know at first */
*_offset = -1;
*_time = GST_CLOCK_TIME_NONE;
/* need initial positions; start and end */
lpos = parse->priv->first_frame_offset;
ltime = parse->priv->first_frame_pts;
/* try other one if no luck */
if (!GST_CLOCK_TIME_IS_VALID (ltime))
ltime = parse->priv->first_frame_dts;
if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
return GST_FLOW_ERROR;
}
hpos = parse->priv->upstream_size;
GST_DEBUG_OBJECT (parse,
"Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
/* check preconditions are satisfied;
* start and end are needed, except for special case where we scan for
* last frame to determine duration */
if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
!GST_CLOCK_TIME_IS_VALID (ltime) ||
(!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
return GST_FLOW_OK;
}
/* shortcut cases */
if (time < ltime) {
goto exit;
} else if (time < ltime + tolerance) {
*_offset = lpos;
*_time = ltime;
goto exit;
} else if (time >= htime) {
*_offset = hpos;
*_time = htime;
goto exit;
}
while (htime > ltime && cont) {
GST_LOG_OBJECT (parse,
"lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
GST_TIME_ARGS (ltime));
GST_LOG_OBJECT (parse,
"hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
GST_TIME_ARGS (htime));
if (G_UNLIKELY (time == G_MAXINT64)) {
newpos = hpos;
} else if (G_LIKELY (hpos > lpos)) {
newpos =
gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
lpos - chunk;
} else {
/* should mean lpos == hpos, since lpos <= hpos is invariant */
newpos = lpos;
/* we check this case once, but not forever, so break loop */
cont = FALSE;
}
/* ensure */
newpos = CLAMP (newpos, lpos, hpos);
GST_LOG_OBJECT (parse,
"estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
GST_TIME_ARGS (time), newpos);
ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
if (ret == GST_FLOW_EOS) {
/* heuristic HACK */
hpos = MAX (lpos, hpos - chunk);
continue;
} else if (ret != GST_FLOW_OK) {
goto exit;
}
if (newtime == -1 || newpos == -1) {
GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
break;
}
if (G_UNLIKELY (time == G_MAXINT64)) {
*_offset = newpos;
*_time = newtime;
if (GST_CLOCK_TIME_IS_VALID (dur))
*_time += dur;
break;
} else if (newtime > time) {
/* overshoot */
hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
htime = newtime;
} else if (newtime + tolerance > time) {
/* close enough undershoot */
*_offset = newpos;
*_time = newtime;
break;
} else if (newtime < ltime) {
/* so a position beyond lpos resulted in earlier time than ltime ... */
GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
break;
} else {
/* undershoot too far */
newpos += newpos == lpos ? chunk : 0;
lpos = CLAMP (newpos, lpos, hpos);
ltime = newtime;
}
}
exit:
GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
return ret;
}
static gint64
gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
gboolean before, GstClockTime * _ts)
{
gint64 bytes = 0, ts = 0;
GstIndexEntry *entry = NULL;
if (time == GST_CLOCK_TIME_NONE) {
ts = time;
bytes = -1;
goto exit;
}
GST_BASE_PARSE_INDEX_LOCK (parse);
if (parse->priv->index) {
/* Let's check if we have an index entry for that time */
entry = gst_index_get_assoc_entry (parse->priv->index,
parse->priv->index_id,
before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
}
if (entry) {
gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
" at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
} else {
GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
GST_TIME_ARGS (time));
if (!before) {
bytes = -1;
ts = GST_CLOCK_TIME_NONE;
}
}
GST_BASE_PARSE_INDEX_UNLOCK (parse);
exit:
if (_ts)
*_ts = ts;
return bytes;
}
/* returns TRUE if seek succeeded */
static gboolean
gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
gboolean flush, update, res = TRUE, accurate;
gint64 start, stop, seekpos, seekstop;
GstSegment seeksegment = { 0, };
GstClockTime start_ts;
guint32 seqnum;
GstEvent *segment_event;
/* try upstream first, unless we're driving the streaming thread ourselves */
if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
if (res)
goto done;
}
gst_event_parse_seek (event, &rate, &format, &flags,
&start_type, &start, &stop_type, &stop);
seqnum = gst_event_get_seqnum (event);
GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
"start type %d at %" GST_TIME_FORMAT ", end type %d at %"
GST_TIME_FORMAT, gst_format_get_name (format), rate,
start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
/* we can only handle TIME, so check if subclass can convert
* to TIME format if it's some other format (such as DEFAULT) */
if (format != GST_FORMAT_TIME) {
if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
|| !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
&stop))
goto no_convert_to_time;
GST_INFO_OBJECT (parse, "converted %s format to start time "
"%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
gst_format_get_name (format), GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
format = GST_FORMAT_TIME;
}
/* no negative rates in push mode (unless upstream takes care of that, but
* we've already tried upstream and it didn't handle the seek request) */
if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
goto negative_rate;
if (start_type != GST_SEEK_TYPE_SET ||
(stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
goto wrong_type;
/* get flush flag */
flush = flags & GST_SEEK_FLAG_FLUSH;
/* copy segment, we need this because we still need the old
* segment when we close the current segment. */
gst_segment_copy_into (&parse->segment, &seeksegment);
GST_DEBUG_OBJECT (parse, "configuring seek");
gst_segment_do_seek (&seeksegment, rate, format, flags,
start_type, start, stop_type, stop, &update);
/* accurate seeking implies seek tables are used to obtain position,
* and the requested segment is maintained exactly, not adjusted any way */
accurate = flags & GST_SEEK_FLAG_ACCURATE;
/* maybe we can be accurate for (almost) free */
gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
GST_DEBUG_OBJECT (parse, "accurate seek possible");
accurate = TRUE;
}
if (accurate) {
GstClockTime startpos;
if (rate >= 0)
startpos = seeksegment.position;
else
startpos = start;
/* accurate requested, so ... seek a bit before target */
if (startpos < parse->priv->lead_in_ts)
startpos = 0;
else
startpos -= parse->priv->lead_in_ts;
if (seeksegment.stop == -1 && seeksegment.duration != -1)
seeksegment.stop = seeksegment.start + seeksegment.duration;
seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
NULL);
} else {
if (rate >= 0)
start_ts = seeksegment.position;
else
start_ts = start;
if (seeksegment.stop == -1 && seeksegment.duration != -1)
seeksegment.stop = seeksegment.start + seeksegment.duration;
if (!gst_base_parse_convert (parse, format, start_ts,
GST_FORMAT_BYTES, &seekpos))
goto convert_failed;
if (!gst_base_parse_convert (parse, format, seeksegment.stop,
GST_FORMAT_BYTES, &seekstop))
goto convert_failed;
}
GST_DEBUG_OBJECT (parse,
"seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
start_ts, seekpos);
GST_DEBUG_OBJECT (parse,
"seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
seeksegment.stop, seekstop);
if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
gint64 last_stop;
GST_DEBUG_OBJECT (parse, "seek in PULL mode");
if (flush) {
if (parse->srcpad) {
GstEvent *fevent = gst_event_new_flush_start ();
GST_DEBUG_OBJECT (parse, "sending flush start");
gst_event_set_seqnum (fevent, seqnum);
gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
/* unlock upstream pull_range */
gst_pad_push_event (parse->sinkpad, fevent);
}
} else {
gst_pad_pause_task (parse->sinkpad);
}
/* we should now be able to grab the streaming thread because we stopped it
* with the above flush/pause code */
GST_PAD_STREAM_LOCK (parse->sinkpad);
/* save current position */
last_stop = parse->segment.position;
GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
last_stop);
/* now commit to new position */
/* prepare for streaming again */
if (flush) {
GstEvent *fevent = gst_event_new_flush_stop (TRUE);
GST_DEBUG_OBJECT (parse, "sending flush stop");
gst_event_set_seqnum (fevent, seqnum);
gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
gst_pad_push_event (parse->sinkpad, fevent);
gst_base_parse_clear_queues (parse);
}
memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
/* store the newsegment event so it can be sent from the streaming thread. */
/* This will be sent later in _loop() */
segment_event = gst_event_new_segment (&parse->segment);
gst_event_set_seqnum (segment_event, seqnum);
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events, segment_event);
GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
"start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
", time = %" GST_TIME_FORMAT, format,
GST_TIME_ARGS (parse->segment.start),
GST_TIME_ARGS (parse->segment.stop),
GST_TIME_ARGS (parse->segment.time));
/* one last chance in pull mode to stay accurate;
* maybe scan and subclass can find where to go */
if (!accurate) {
gint64 scanpos;
GstClockTime ts = seeksegment.position;
gst_base_parse_locate_time (parse, &ts, &scanpos);
if (scanpos >= 0) {
accurate = TRUE;
seekpos = scanpos;
/* running collected index now consists of several intervals,
* so optimized check no longer possible */
parse->priv->index_last_valid = FALSE;
parse->priv->index_last_offset = 0;
parse->priv->index_last_ts = 0;
}
}
/* mark discont if we are going to stream from another position. */
if (seekpos != parse->priv->offset) {
GST_DEBUG_OBJECT (parse,
"mark DISCONT, we did a seek to another position");
parse->priv->offset = seekpos;
parse->priv->last_offset = seekpos;
parse->priv->seen_keyframe = FALSE;
parse->priv->discont = TRUE;
parse->priv->next_dts = start_ts;
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->sync_offset = seekpos;
parse->priv->exact_position = accurate;
}
/* Start streaming thread if paused */
gst_pad_start_task (parse->sinkpad,
(GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
GST_PAD_STREAM_UNLOCK (parse->sinkpad);
/* handled seek */
res = TRUE;
} else {
GstEvent *new_event;
GstBaseParseSeek *seek;
GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
/* The only thing we need to do in PUSH-mode is to send the
seek event (in bytes) to upstream. Segment / flush handling happens
in corresponding src event handlers */
GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
if (seekstop >= 0 && seekstop <= seekpos)
seekstop = seekpos;
new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
gst_event_set_seqnum (new_event, seqnum);
/* store segment info so its precise details can be reconstructed when
* receiving newsegment;
* this matters for all details when accurate seeking,
* is most useful to preserve NONE stop time otherwise */
seek = g_new0 (GstBaseParseSeek, 1);
seek->segment = seeksegment;
seek->accurate = accurate;
seek->offset = seekpos;
seek->start_ts = start_ts;
GST_OBJECT_LOCK (parse);
/* less optimal, but preserves order */
parse->priv->pending_seeks =
g_slist_append (parse->priv->pending_seeks, seek);
GST_OBJECT_UNLOCK (parse);
res = gst_pad_push_event (parse->sinkpad, new_event);
if (!res) {
GST_OBJECT_LOCK (parse);
parse->priv->pending_seeks =
g_slist_remove (parse->priv->pending_seeks, seek);
GST_OBJECT_UNLOCK (parse);
g_free (seek);
}
}
done:
gst_event_unref (event);
return res;
/* ERRORS */
negative_rate:
{
GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
res = FALSE;
goto done;
}
wrong_type:
{
GST_DEBUG_OBJECT (parse, "unsupported seek type.");
res = FALSE;
goto done;
}
no_convert_to_time:
{
GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
"couldn't convert that into TIME format", gst_format_get_name (format));
res = FALSE;
goto done;
}
convert_failed:
{
GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
res = FALSE;
goto done;
}
}
static void
gst_base_parse_set_upstream_tags (GstBaseParse * parse, GstTagList * taglist)
{
if (taglist == parse->priv->upstream_tags)
return;
if (parse->priv->upstream_tags) {
gst_tag_list_unref (parse->priv->upstream_tags);
parse->priv->upstream_tags = NULL;
}
GST_INFO_OBJECT (parse, "upstream tags: %" GST_PTR_FORMAT, taglist);
if (taglist != NULL)
parse->priv->upstream_tags = gst_tag_list_ref (taglist);
gst_base_parse_check_bitrate_tags (parse);
}
#if 0
static void
gst_base_parse_set_index (GstElement * element, GstIndex * index)
{
GstBaseParse *parse = GST_BASE_PARSE (element);
GST_BASE_PARSE_INDEX_LOCK (parse);
if (parse->priv->index)
gst_object_unref (parse->priv->index);
if (index) {
parse->priv->index = gst_object_ref (index);
gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
&parse->priv->index_id);
parse->priv->own_index = FALSE;
} else {
parse->priv->index = NULL;
}
GST_BASE_PARSE_INDEX_UNLOCK (parse);
}
static GstIndex *
gst_base_parse_get_index (GstElement * element)
{
GstBaseParse *parse = GST_BASE_PARSE (element);
GstIndex *result = NULL;
GST_BASE_PARSE_INDEX_LOCK (parse);
if (parse->priv->index)
result = gst_object_ref (parse->priv->index);
GST_BASE_PARSE_INDEX_UNLOCK (parse);
return result;
}
#endif
static GstStateChangeReturn
gst_base_parse_change_state (GstElement * element, GstStateChange transition)
{
GstBaseParse *parse;
GstStateChangeReturn result;
parse = GST_BASE_PARSE (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* If this is our own index destroy it as the
* old entries might be wrong for the new stream */
GST_BASE_PARSE_INDEX_LOCK (parse);
if (parse->priv->own_index) {
gst_object_unref (parse->priv->index);
parse->priv->index = NULL;
parse->priv->own_index = FALSE;
}
/* If no index was created, generate one */
if (G_UNLIKELY (!parse->priv->index)) {
GST_DEBUG_OBJECT (parse, "no index provided creating our own");
parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
&parse->priv->index_id);
parse->priv->own_index = TRUE;
}
GST_BASE_PARSE_INDEX_UNLOCK (parse);
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_base_parse_reset (parse);
break;
default:
break;
}
return result;
}
/**
* gst_base_parse_set_ts_at_offset:
* @parse: a #GstBaseParse
* @offset: offset into current buffer
*
* This function should only be called from a @handle_frame implementation.
*
* #GstBaseParse creates initial timestamps for frames by using the last
* timestamp seen in the stream before the frame starts. In certain
* cases, the correct timestamps will occur in the stream after the
* start of the frame, but before the start of the actual picture data.
* This function can be used to set the timestamps based on the offset
* into the frame data that the picture starts.
*
* Since: 1.2
*/
void
gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
{
GstClockTime pts, dts;
g_return_if_fail (GST_IS_BASE_PARSE (parse));
pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
GST_DEBUG_OBJECT (parse,
"offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
}
if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
parse->priv->prev_pts = parse->priv->next_pts = pts;
if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts)) {
parse->priv->prev_dts = parse->priv->next_dts = dts;
parse->priv->prev_dts_from_pts = FALSE;
}
}
/**
* gst_base_parse_merge_tags:
* @parse: a #GstBaseParse
* @tags: (allow-none): a #GstTagList to merge, or NULL to unset
* previously-set tags
* @mode: the #GstTagMergeMode to use, usually #GST_TAG_MERGE_REPLACE
*
* Sets the parser subclass's tags and how they should be merged with any
* upstream stream tags. This will override any tags previously-set
* with gst_base_parse_merge_tags().
*
* Note that this is provided for convenience, and the subclass is
* not required to use this and can still do tag handling on its own.
*
* Since: 1.6
*/
void
gst_base_parse_merge_tags (GstBaseParse * parse, GstTagList * tags,
GstTagMergeMode mode)
{
g_return_if_fail (GST_IS_BASE_PARSE (parse));
g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
g_return_if_fail (tags == NULL || mode != GST_TAG_MERGE_UNDEFINED);
GST_OBJECT_LOCK (parse);
if (tags != parse->priv->parser_tags) {
if (parse->priv->parser_tags) {
gst_tag_list_unref (parse->priv->parser_tags);
parse->priv->parser_tags = NULL;
parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
}
if (tags) {
parse->priv->parser_tags = gst_tag_list_ref (tags);
parse->priv->parser_tags_merge_mode = mode;
}
GST_DEBUG_OBJECT (parse, "setting parser tags to %" GST_PTR_FORMAT
" (mode %d)", tags, parse->priv->parser_tags_merge_mode);
gst_base_parse_check_bitrate_tags (parse);
parse->priv->tags_changed = TRUE;
}
GST_OBJECT_UNLOCK (parse);
}