/* RTP muxer element for GStreamer
*
* gstrtpmux.c:
*
* Copyright (C) <2007-2010> Nokia Corporation.
* Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
* Copyright (C) <2007-2010> Collabora Ltd
* Contact: Olivier Crete <olivier.crete@collabora.co.uk>
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000,2005 Wim Taymans <wim@fluendo.com>
*
* 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:element-rtpmux
* @see_also: rtpdtmfmux
*
* The rtp muxer takes multiple RTP streams having the same clock-rate and
* muxes into a single stream with a single SSRC.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch-1.0 rtpmux name=mux ! udpsink host=127.0.0.1 port=8888 \
* alsasrc ! alawenc ! rtppcmapay ! \
* application/x-rtp, payload=8, rate=8000 ! mux.sink_0 \
* audiotestsrc is-live=1 ! \
* mulawenc ! rtppcmupay ! \
* application/x-rtp, payload=0, rate=8000 ! mux.sink_1
* ]|
* In this example, an audio stream is captured from ALSA and another is
* generated, both are encoded into different payload types and muxed together
* so they can be sent on the same port.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <string.h>
#include "gstrtpmux.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_mux_debug);
#define GST_CAT_DEFAULT gst_rtp_mux_debug
enum
{
PROP_0,
PROP_TIMESTAMP_OFFSET,
PROP_SEQNUM_OFFSET,
PROP_SEQNUM,
PROP_SSRC
};
#define DEFAULT_TIMESTAMP_OFFSET -1
#define DEFAULT_SEQNUM_OFFSET -1
#define DEFAULT_SSRC -1
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstPad *gst_rtp_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
static void gst_rtp_mux_release_pad (GstElement * element, GstPad * pad);
static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstFlowReturn gst_rtp_mux_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * bufferlist);
static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstRTPMux * rtp_mux,
GstCaps * caps);
static gboolean gst_rtp_mux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_rtp_mux_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstStateChangeReturn gst_rtp_mux_change_state (GstElement *
element, GstStateChange transition);
static void gst_rtp_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_mux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_rtp_mux_dispose (GObject * object);
static gboolean gst_rtp_mux_src_event_real (GstRTPMux * rtp_mux,
GstEvent * event);
G_DEFINE_TYPE (GstRTPMux, gst_rtp_mux, GST_TYPE_ELEMENT);
static void
gst_rtp_mux_class_init (GstRTPMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
gst_element_class_add_static_pad_template (gstelement_class, &sink_factory);
gst_element_class_set_static_metadata (gstelement_class, "RTP muxer",
"Codec/Muxer",
"multiplex N rtp streams into one", "Zeeshan Ali <first.last@nokia.com>");
gobject_class->get_property = gst_rtp_mux_get_property;
gobject_class->set_property = gst_rtp_mux_set_property;
gobject_class->dispose = gst_rtp_mux_dispose;
klass->src_event = gst_rtp_mux_src_event_real;
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_TIMESTAMP_OFFSET, g_param_spec_int ("timestamp-offset",
"Timestamp Offset",
"Offset to add to all outgoing timestamps (-1 = random)", -1,
G_MAXINT, DEFAULT_TIMESTAMP_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET,
g_param_spec_int ("seqnum-offset", "Sequence number Offset",
"Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXINT,
DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM,
g_param_spec_uint ("seqnum", "Sequence number",
"The RTP sequence number of the last processed packet",
0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC,
g_param_spec_uint ("ssrc", "SSRC",
"The SSRC of the packets (default == random)",
0, G_MAXUINT, DEFAULT_SSRC,
GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtp_mux_request_new_pad);
gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_rtp_mux_release_pad);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_mux_change_state);
}
static void
gst_rtp_mux_dispose (GObject * object)
{
GstRTPMux *rtp_mux = GST_RTP_MUX (object);
GList *item;
g_clear_object (&rtp_mux->last_pad);
restart:
for (item = GST_ELEMENT_PADS (object); item; item = g_list_next (item)) {
GstPad *pad = GST_PAD (item->data);
if (GST_PAD_IS_SINK (pad)) {
gst_element_release_request_pad (GST_ELEMENT (object), pad);
goto restart;
}
}
G_OBJECT_CLASS (gst_rtp_mux_parent_class)->dispose (object);
}
static gboolean
gst_rtp_mux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRTPMux *rtp_mux = GST_RTP_MUX (parent);
GstRTPMuxClass *klass;
gboolean ret;
klass = GST_RTP_MUX_GET_CLASS (rtp_mux);
ret = klass->src_event (rtp_mux, event);
return ret;
}
static gboolean
gst_rtp_mux_src_event_real (GstRTPMux * rtp_mux, GstEvent * event)
{
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
{
const GstStructure *s = gst_event_get_structure (event);
if (gst_structure_has_name (s, "GstRTPCollision")) {
guint ssrc = 0;
if (!gst_structure_get_uint (s, "ssrc", &ssrc))
ssrc = -1;
GST_DEBUG_OBJECT (rtp_mux, "collided ssrc: %" G_GUINT32_FORMAT, ssrc);
/* choose another ssrc for our stream */
GST_OBJECT_LOCK (rtp_mux);
if (ssrc == rtp_mux->current_ssrc) {
GstCaps *caps;
guint suggested_ssrc = 0;
guint32 new_ssrc;
if (gst_structure_get_uint (s, "suggested-ssrc", &suggested_ssrc))
rtp_mux->current_ssrc = suggested_ssrc;
while (ssrc == rtp_mux->current_ssrc)
rtp_mux->current_ssrc = g_random_int ();
new_ssrc = rtp_mux->current_ssrc;
GST_OBJECT_UNLOCK (rtp_mux);
caps = gst_pad_get_current_caps (rtp_mux->srcpad);
caps = gst_caps_make_writable (caps);
gst_caps_set_simple (caps, "ssrc", G_TYPE_UINT, new_ssrc, NULL);
gst_pad_set_caps (rtp_mux->srcpad, caps);
gst_caps_unref (caps);
} else {
GST_OBJECT_UNLOCK (rtp_mux);
}
}
break;
}
default:
break;
}
return gst_pad_event_default (rtp_mux->srcpad, GST_OBJECT (rtp_mux), event);
}
static void
gst_rtp_mux_init (GstRTPMux * rtp_mux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtp_mux);
rtp_mux->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_event_function (rtp_mux->srcpad,
GST_DEBUG_FUNCPTR (gst_rtp_mux_src_event));
gst_pad_use_fixed_caps (rtp_mux->srcpad);
gst_element_add_pad (GST_ELEMENT (rtp_mux), rtp_mux->srcpad);
rtp_mux->ssrc = DEFAULT_SSRC;
rtp_mux->current_ssrc = DEFAULT_SSRC;
rtp_mux->ssrc_random = TRUE;
rtp_mux->ts_offset = DEFAULT_TIMESTAMP_OFFSET;
rtp_mux->seqnum_offset = DEFAULT_SEQNUM_OFFSET;
rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
}
static void
gst_rtp_mux_setup_sinkpad (GstRTPMux * rtp_mux, GstPad * sinkpad)
{
GstRTPMuxPadPrivate *padpriv = g_slice_new0 (GstRTPMuxPadPrivate);
/* setup some pad functions */
gst_pad_set_chain_function (sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_chain));
gst_pad_set_chain_list_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_mux_chain_list));
gst_pad_set_event_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_mux_sink_event));
gst_pad_set_query_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_mux_sink_query));
gst_segment_init (&padpriv->segment, GST_FORMAT_UNDEFINED);
gst_pad_set_element_private (sinkpad, padpriv);
gst_pad_set_active (sinkpad, TRUE);
gst_element_add_pad (GST_ELEMENT (rtp_mux), sinkpad);
}
static GstPad *
gst_rtp_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
{
GstRTPMux *rtp_mux;
GstPad *newpad;
g_return_val_if_fail (templ != NULL, NULL);
g_return_val_if_fail (GST_IS_RTP_MUX (element), NULL);
rtp_mux = GST_RTP_MUX (element);
if (templ->direction != GST_PAD_SINK) {
GST_WARNING_OBJECT (rtp_mux, "request pad that is not a SINK pad");
return NULL;
}
newpad = gst_pad_new_from_template (templ, req_name);
if (newpad)
gst_rtp_mux_setup_sinkpad (rtp_mux, newpad);
else
GST_WARNING_OBJECT (rtp_mux, "failed to create request pad");
return newpad;
}
static void
gst_rtp_mux_release_pad (GstElement * element, GstPad * pad)
{
GstRTPMuxPadPrivate *padpriv;
GST_OBJECT_LOCK (element);
padpriv = gst_pad_get_element_private (pad);
gst_pad_set_element_private (pad, NULL);
GST_OBJECT_UNLOCK (element);
gst_element_remove_pad (element, pad);
if (padpriv) {
g_slice_free (GstRTPMuxPadPrivate, padpriv);
}
}
/* Put our own timestamp-offset on the buffer */
static void
gst_rtp_mux_readjust_rtp_timestamp_locked (GstRTPMux * rtp_mux,
GstRTPMuxPadPrivate * padpriv, GstRTPBuffer * rtpbuffer)
{
guint32 ts;
guint32 sink_ts_base = 0;
if (padpriv && padpriv->have_timestamp_offset)
sink_ts_base = padpriv->timestamp_offset;
ts = gst_rtp_buffer_get_timestamp (rtpbuffer) - sink_ts_base +
rtp_mux->ts_base;
GST_LOG_OBJECT (rtp_mux, "Re-adjusting RTP ts %u to %u",
gst_rtp_buffer_get_timestamp (rtpbuffer), ts);
gst_rtp_buffer_set_timestamp (rtpbuffer, ts);
}
static gboolean
process_buffer_locked (GstRTPMux * rtp_mux, GstRTPMuxPadPrivate * padpriv,
GstRTPBuffer * rtpbuffer)
{
GstRTPMuxClass *klass = GST_RTP_MUX_GET_CLASS (rtp_mux);
if (klass->accept_buffer_locked)
if (!klass->accept_buffer_locked (rtp_mux, padpriv, rtpbuffer))
return FALSE;
rtp_mux->seqnum++;
gst_rtp_buffer_set_seq (rtpbuffer, rtp_mux->seqnum);
gst_rtp_buffer_set_ssrc (rtpbuffer, rtp_mux->current_ssrc);
gst_rtp_mux_readjust_rtp_timestamp_locked (rtp_mux, padpriv, rtpbuffer);
GST_LOG_OBJECT (rtp_mux,
"Pushing packet size %" G_GSIZE_FORMAT ", seq=%d, ts=%u",
rtpbuffer->map[0].size, rtp_mux->seqnum,
gst_rtp_buffer_get_timestamp (rtpbuffer));
if (padpriv) {
if (padpriv->segment.format == GST_FORMAT_TIME) {
GST_BUFFER_PTS (rtpbuffer->buffer) =
gst_segment_to_running_time (&padpriv->segment, GST_FORMAT_TIME,
GST_BUFFER_PTS (rtpbuffer->buffer));
GST_BUFFER_DTS (rtpbuffer->buffer) =
gst_segment_to_running_time (&padpriv->segment, GST_FORMAT_TIME,
GST_BUFFER_DTS (rtpbuffer->buffer));
}
}
return TRUE;
}
struct BufferListData
{
GstRTPMux *rtp_mux;
GstRTPMuxPadPrivate *padpriv;
gboolean drop;
};
static gboolean
process_list_item (GstBuffer ** buffer, guint idx, gpointer user_data)
{
struct BufferListData *bd = user_data;
GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
*buffer = gst_buffer_make_writable (*buffer);
gst_rtp_buffer_map (*buffer, GST_MAP_READWRITE, &rtpbuffer);
bd->drop = !process_buffer_locked (bd->rtp_mux, bd->padpriv, &rtpbuffer);
gst_rtp_buffer_unmap (&rtpbuffer);
if (bd->drop)
return FALSE;
if (GST_BUFFER_DURATION_IS_VALID (*buffer) &&
GST_BUFFER_PTS_IS_VALID (*buffer))
bd->rtp_mux->last_stop = GST_BUFFER_PTS (*buffer) +
GST_BUFFER_DURATION (*buffer);
else
bd->rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
return TRUE;
}
static gboolean resend_events (GstPad * pad, GstEvent ** event,
gpointer user_data);
static GstFlowReturn
gst_rtp_mux_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * bufferlist)
{
GstRTPMux *rtp_mux;
GstFlowReturn ret;
GstRTPMuxPadPrivate *padpriv;
gboolean changed = FALSE;
struct BufferListData bd;
rtp_mux = GST_RTP_MUX (parent);
if (gst_pad_check_reconfigure (rtp_mux->srcpad)) {
GstCaps *current_caps = gst_pad_get_current_caps (pad);
if (!gst_rtp_mux_setcaps (pad, rtp_mux, current_caps)) {
gst_pad_mark_reconfigure (rtp_mux->srcpad);
if (GST_PAD_IS_FLUSHING (rtp_mux->srcpad))
ret = GST_FLOW_FLUSHING;
else
ret = GST_FLOW_NOT_NEGOTIATED;
gst_buffer_list_unref (bufferlist);
goto out;
}
gst_caps_unref (current_caps);
}
GST_OBJECT_LOCK (rtp_mux);
padpriv = gst_pad_get_element_private (pad);
if (!padpriv) {
GST_OBJECT_UNLOCK (rtp_mux);
ret = GST_FLOW_NOT_LINKED;
gst_buffer_list_unref (bufferlist);
goto out;
}
bd.rtp_mux = rtp_mux;
bd.padpriv = padpriv;
bd.drop = FALSE;
bufferlist = gst_buffer_list_make_writable (bufferlist);
gst_buffer_list_foreach (bufferlist, process_list_item, &bd);
if (!bd.drop && pad != rtp_mux->last_pad) {
changed = TRUE;
g_clear_object (&rtp_mux->last_pad);
rtp_mux->last_pad = g_object_ref (pad);
}
GST_OBJECT_UNLOCK (rtp_mux);
if (changed)
gst_pad_sticky_events_foreach (pad, resend_events, rtp_mux);
if (bd.drop) {
gst_buffer_list_unref (bufferlist);
ret = GST_FLOW_OK;
} else {
ret = gst_pad_push_list (rtp_mux->srcpad, bufferlist);
}
out:
return ret;
}
static gboolean
resend_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstRTPMux *rtp_mux = user_data;
if (GST_EVENT_TYPE (*event) == GST_EVENT_CAPS) {
GstCaps *caps;
gst_event_parse_caps (*event, &caps);
gst_rtp_mux_setcaps (pad, rtp_mux, caps);
} else if (GST_EVENT_TYPE (*event) == GST_EVENT_SEGMENT) {
GstSegment new_segment;
gst_segment_init (&new_segment, GST_FORMAT_TIME);
gst_pad_push_event (rtp_mux->srcpad, gst_event_new_segment (&new_segment));
} else {
gst_pad_push_event (rtp_mux->srcpad, gst_event_ref (*event));
}
return TRUE;
}
static GstFlowReturn
gst_rtp_mux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstRTPMux *rtp_mux;
GstFlowReturn ret;
GstRTPMuxPadPrivate *padpriv;
gboolean drop;
gboolean changed = FALSE;
GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
rtp_mux = GST_RTP_MUX (parent);
if (gst_pad_check_reconfigure (rtp_mux->srcpad)) {
GstCaps *current_caps = gst_pad_get_current_caps (pad);
if (!gst_rtp_mux_setcaps (pad, rtp_mux, current_caps)) {
gst_pad_mark_reconfigure (rtp_mux->srcpad);
if (GST_PAD_IS_FLUSHING (rtp_mux->srcpad))
ret = GST_FLOW_FLUSHING;
else
ret = GST_FLOW_NOT_NEGOTIATED;
gst_buffer_unref (buffer);
goto out;
}
gst_caps_unref (current_caps);
}
GST_OBJECT_LOCK (rtp_mux);
padpriv = gst_pad_get_element_private (pad);
if (!padpriv) {
GST_OBJECT_UNLOCK (rtp_mux);
gst_buffer_unref (buffer);
return GST_FLOW_NOT_LINKED;
}
buffer = gst_buffer_make_writable (buffer);
if (!gst_rtp_buffer_map (buffer, GST_MAP_READWRITE, &rtpbuffer)) {
GST_OBJECT_UNLOCK (rtp_mux);
gst_buffer_unref (buffer);
GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer");
return GST_FLOW_ERROR;
}
drop = !process_buffer_locked (rtp_mux, padpriv, &rtpbuffer);
gst_rtp_buffer_unmap (&rtpbuffer);
if (!drop) {
if (pad != rtp_mux->last_pad) {
changed = TRUE;
g_clear_object (&rtp_mux->last_pad);
rtp_mux->last_pad = g_object_ref (pad);
}
if (GST_BUFFER_DURATION_IS_VALID (buffer) &&
GST_BUFFER_PTS_IS_VALID (buffer))
rtp_mux->last_stop = GST_BUFFER_PTS (buffer) +
GST_BUFFER_DURATION (buffer);
else
rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (rtp_mux);
if (changed)
gst_pad_sticky_events_foreach (pad, resend_events, rtp_mux);
if (drop) {
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
} else {
ret = gst_pad_push (rtp_mux->srcpad, buffer);
}
out:
return ret;
}
static gboolean
gst_rtp_mux_setcaps (GstPad * pad, GstRTPMux * rtp_mux, GstCaps * caps)
{
GstStructure *structure;
gboolean ret = FALSE;
GstRTPMuxPadPrivate *padpriv;
GstCaps *peercaps;
if (!gst_caps_is_fixed (caps))
return FALSE;
peercaps = gst_pad_peer_query_caps (rtp_mux->srcpad, NULL);
if (peercaps) {
GstCaps *tcaps, *othercaps;;
tcaps = gst_pad_get_pad_template_caps (pad);
othercaps = gst_caps_intersect_full (peercaps, tcaps,
GST_CAPS_INTERSECT_FIRST);
if (gst_caps_get_size (othercaps) > 0) {
structure = gst_caps_get_structure (othercaps, 0);
GST_OBJECT_LOCK (rtp_mux);
if (gst_structure_get_uint (structure, "ssrc", &rtp_mux->current_ssrc)) {
GST_DEBUG_OBJECT (pad, "Use downstream ssrc: %x",
rtp_mux->current_ssrc);
rtp_mux->have_ssrc = TRUE;
}
GST_OBJECT_UNLOCK (rtp_mux);
}
gst_caps_unref (othercaps);
gst_caps_unref (peercaps);
gst_caps_unref (tcaps);
}
structure = gst_caps_get_structure (caps, 0);
if (!structure)
return FALSE;
GST_OBJECT_LOCK (rtp_mux);
padpriv = gst_pad_get_element_private (pad);
if (padpriv &&
gst_structure_get_uint (structure, "timestamp-offset",
&padpriv->timestamp_offset)) {
padpriv->have_timestamp_offset = TRUE;
}
caps = gst_caps_copy (caps);
/* if we don't have a specified ssrc, first try to take one from the caps,
and if that fails, generate one */
if (!rtp_mux->have_ssrc) {
if (rtp_mux->ssrc_random) {
if (!gst_structure_get_uint (structure, "ssrc", &rtp_mux->current_ssrc))
rtp_mux->current_ssrc = g_random_int ();
rtp_mux->have_ssrc = TRUE;
}
}
gst_caps_set_simple (caps,
"timestamp-offset", G_TYPE_UINT, rtp_mux->ts_base,
"seqnum-offset", G_TYPE_UINT, rtp_mux->seqnum_base,
"ssrc", G_TYPE_UINT, rtp_mux->current_ssrc, NULL);
GST_OBJECT_UNLOCK (rtp_mux);
if (rtp_mux->send_stream_start) {
gchar s_id[32];
/* stream-start (FIXME: create id based on input ids) */
g_snprintf (s_id, sizeof (s_id), "interleave-%08x", g_random_int ());
gst_pad_push_event (rtp_mux->srcpad, gst_event_new_stream_start (s_id));
rtp_mux->send_stream_start = FALSE;
}
GST_DEBUG_OBJECT (rtp_mux,
"setting caps %" GST_PTR_FORMAT " on src pad..", caps);
ret = gst_pad_set_caps (rtp_mux->srcpad, caps);
gst_caps_unref (caps);
return ret;
}
static void
clear_caps (GstCaps * caps, gboolean only_clock_rate)
{
gint i, j;
/* Lets only match on the clock-rate */
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstStructure *s = gst_caps_get_structure (caps, i);
for (j = 0; j < gst_structure_n_fields (s); j++) {
const gchar *name = gst_structure_nth_field_name (s, j);
if (strcmp (name, "clock-rate") && (only_clock_rate ||
(strcmp (name, "ssrc")))) {
gst_structure_remove_field (s, name);
j--;
}
}
}
}
static gboolean
same_clock_rate_fold (const GValue * item, GValue * ret, gpointer user_data)
{
GstPad *mypad = user_data;
GstPad *pad = g_value_get_object (item);
GstCaps *peercaps;
GstCaps *accumcaps;
if (pad == mypad)
return TRUE;
accumcaps = g_value_get_boxed (ret);
peercaps = gst_pad_peer_query_caps (pad, accumcaps);
if (!peercaps) {
g_warning ("no peercaps");
return TRUE;
}
peercaps = gst_caps_make_writable (peercaps);
clear_caps (peercaps, TRUE);
g_value_take_boxed (ret, peercaps);
return !gst_caps_is_empty (peercaps);
}
static GstCaps *
gst_rtp_mux_getcaps (GstPad * pad, GstRTPMux * mux, GstCaps * filter)
{
GstCaps *caps = NULL;
GstIterator *iter = NULL;
GValue v = { 0 };
GstIteratorResult res;
GstCaps *peercaps;
GstCaps *othercaps;
GstCaps *tcaps;
peercaps = gst_pad_peer_query_caps (mux->srcpad, NULL);
if (peercaps) {
tcaps = gst_pad_get_pad_template_caps (pad);
othercaps = gst_caps_intersect_full (peercaps, tcaps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (peercaps);
} else {
tcaps = gst_pad_get_pad_template_caps (mux->srcpad);
if (filter)
othercaps = gst_caps_intersect_full (filter, tcaps,
GST_CAPS_INTERSECT_FIRST);
else
othercaps = gst_caps_copy (tcaps);
}
gst_caps_unref (tcaps);
GST_LOG_OBJECT (pad, "Intersected srcpad-peercaps and template caps: %"
GST_PTR_FORMAT, othercaps);
clear_caps (othercaps, TRUE);
g_value_init (&v, GST_TYPE_CAPS);
iter = gst_element_iterate_sink_pads (GST_ELEMENT (mux));
do {
gst_value_set_caps (&v, othercaps);
res = gst_iterator_fold (iter, same_clock_rate_fold, &v, pad);
gst_iterator_resync (iter);
} while (res == GST_ITERATOR_RESYNC);
gst_iterator_free (iter);
caps = gst_caps_intersect ((GstCaps *) gst_value_get_caps (&v), othercaps);
g_value_unset (&v);
gst_caps_unref (othercaps);
if (res == GST_ITERATOR_ERROR) {
gst_caps_unref (caps);
caps = gst_caps_new_empty ();
}
return caps;
}
static gboolean
gst_rtp_mux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstRTPMux *mux = GST_RTP_MUX (parent);
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
GST_LOG_OBJECT (pad, "Received caps-query with filter-caps: %"
GST_PTR_FORMAT, filter);
caps = gst_rtp_mux_getcaps (pad, mux, filter);
gst_query_set_caps_result (query, caps);
GST_LOG_OBJECT (mux, "Answering caps-query with caps: %"
GST_PTR_FORMAT, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static void
gst_rtp_mux_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstRTPMux *rtp_mux;
rtp_mux = GST_RTP_MUX (object);
GST_OBJECT_LOCK (rtp_mux);
switch (prop_id) {
case PROP_TIMESTAMP_OFFSET:
g_value_set_int (value, rtp_mux->ts_offset);
break;
case PROP_SEQNUM_OFFSET:
g_value_set_int (value, rtp_mux->seqnum_offset);
break;
case PROP_SEQNUM:
g_value_set_uint (value, rtp_mux->seqnum);
break;
case PROP_SSRC:
g_value_set_uint (value, rtp_mux->ssrc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (rtp_mux);
}
static void
gst_rtp_mux_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRTPMux *rtp_mux;
rtp_mux = GST_RTP_MUX (object);
switch (prop_id) {
case PROP_TIMESTAMP_OFFSET:
rtp_mux->ts_offset = g_value_get_int (value);
break;
case PROP_SEQNUM_OFFSET:
rtp_mux->seqnum_offset = g_value_get_int (value);
break;
case PROP_SSRC:
GST_OBJECT_LOCK (rtp_mux);
rtp_mux->ssrc = g_value_get_uint (value);
rtp_mux->current_ssrc = rtp_mux->ssrc;
rtp_mux->have_ssrc = TRUE;
rtp_mux->ssrc_random = FALSE;
GST_OBJECT_UNLOCK (rtp_mux);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_rtp_mux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRTPMux *mux = GST_RTP_MUX (parent);
gboolean is_pad;
gboolean ret;
GST_OBJECT_LOCK (mux);
is_pad = (pad == mux->last_pad);
GST_OBJECT_UNLOCK (mux);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
GST_LOG_OBJECT (pad, "Received caps-event with caps: %"
GST_PTR_FORMAT, caps);
ret = gst_rtp_mux_setcaps (pad, mux, caps);
gst_event_unref (event);
return ret;
}
case GST_EVENT_FLUSH_STOP:
{
GST_OBJECT_LOCK (mux);
mux->last_stop = GST_CLOCK_TIME_NONE;
GST_OBJECT_UNLOCK (mux);
break;
}
case GST_EVENT_SEGMENT:
{
GstRTPMuxPadPrivate *padpriv;
GST_OBJECT_LOCK (mux);
padpriv = gst_pad_get_element_private (pad);
if (padpriv) {
gst_event_copy_segment (event, &padpriv->segment);
}
GST_OBJECT_UNLOCK (mux);
if (is_pad) {
GstSegment new_segment;
gst_segment_init (&new_segment, GST_FORMAT_TIME);
gst_event_unref (event);
event = gst_event_new_segment (&new_segment);
}
break;
}
default:
break;
}
if (is_pad) {
return gst_pad_push_event (mux->srcpad, event);
} else {
gst_event_unref (event);
return TRUE;
}
}
static void
gst_rtp_mux_ready_to_paused (GstRTPMux * rtp_mux)
{
GST_OBJECT_LOCK (rtp_mux);
g_clear_object (&rtp_mux->last_pad);
rtp_mux->send_stream_start = TRUE;
if (rtp_mux->seqnum_offset == -1)
rtp_mux->seqnum_base = g_random_int_range (0, G_MAXUINT16);
else
rtp_mux->seqnum_base = rtp_mux->seqnum_offset;
rtp_mux->seqnum = rtp_mux->seqnum_base;
if (rtp_mux->ts_offset == -1)
rtp_mux->ts_base = g_random_int ();
else
rtp_mux->ts_base = rtp_mux->ts_offset;
rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
if (rtp_mux->ssrc_random) {
rtp_mux->have_ssrc = FALSE;
} else {
rtp_mux->current_ssrc = rtp_mux->ssrc;
rtp_mux->have_ssrc = TRUE;
}
GST_DEBUG_OBJECT (rtp_mux, "set timestamp-offset to %u", rtp_mux->ts_base);
GST_OBJECT_UNLOCK (rtp_mux);
}
static GstStateChangeReturn
gst_rtp_mux_change_state (GstElement * element, GstStateChange transition)
{
GstRTPMux *rtp_mux;
GstStateChangeReturn ret;
rtp_mux = GST_RTP_MUX (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtp_mux_ready_to_paused (rtp_mux);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (gst_rtp_mux_parent_class)->change_state (element,
transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
g_clear_object (&rtp_mux->last_pad);
break;
default:
break;
}
return ret;
}
gboolean
gst_rtp_mux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_rtp_mux_debug, "rtpmux", 0, "rtp muxer");
return gst_element_register (plugin, "rtpmux", GST_RANK_NONE,
GST_TYPE_RTP_MUX);
}