/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#include "config.h"
#define GST_USE_UNSTABLE_API
#include <gst/base/gstpushsrc.h>
#include "shell-recorder-src.h"
struct _ShellRecorderSrc
{
GstPushSrc parent;
GMutex mutex;
GstCaps *caps;
GMutex queue_lock;
GCond queue_cond;
GQueue *queue;
gboolean eos;
gboolean flushing;
guint memory_used;
guint memory_used_update_idle;
};
struct _ShellRecorderSrcClass
{
GstPushSrcClass parent_class;
};
enum {
PROP_0,
PROP_CAPS,
PROP_MEMORY_USED
};
#define shell_recorder_src_parent_class parent_class
G_DEFINE_TYPE(ShellRecorderSrc, shell_recorder_src, GST_TYPE_PUSH_SRC);
static void
shell_recorder_src_init (ShellRecorderSrc *src)
{
gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
src->queue = g_queue_new ();
g_mutex_init (&src->mutex);
g_mutex_init (&src->queue_lock);
g_cond_init (&src->queue_cond);
}
static gboolean
shell_recorder_src_memory_used_update_idle (gpointer data)
{
ShellRecorderSrc *src = data;
g_mutex_lock (&src->mutex);
src->memory_used_update_idle = 0;
g_mutex_unlock (&src->mutex);
g_object_notify (G_OBJECT (src), "memory-used");
return FALSE;
}
/* The memory_used property is used to monitor buffer usage,
* so we marshal notification back to the main loop thread.
*/
static void
shell_recorder_src_update_memory_used (ShellRecorderSrc *src,
int delta)
{
g_mutex_lock (&src->mutex);
src->memory_used += delta;
if (src->memory_used_update_idle == 0)
{
src->memory_used_update_idle = g_idle_add (shell_recorder_src_memory_used_update_idle, src);
g_source_set_name_by_id (src->memory_used_update_idle, "[gnome-shell] shell_recorder_src_memory_used_update_idle");
}
g_mutex_unlock (&src->mutex);
}
/* _negotiate() is called when we have to decide on a format. We
* use the configured format */
static gboolean
shell_recorder_src_negotiate (GstBaseSrc * base_src)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
gboolean result;
result = gst_base_src_set_caps (base_src, src->caps);
return result;
}
static gboolean
shell_recorder_src_unlock (GstBaseSrc * base_src)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
g_mutex_lock (&src->queue_lock);
src->flushing = TRUE;
g_cond_signal (&src->queue_cond);
g_mutex_unlock (&src->queue_lock);
return TRUE;
}
static gboolean
shell_recorder_src_unlock_stop (GstBaseSrc * base_src)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
g_mutex_lock (&src->queue_lock);
src->flushing = FALSE;
g_cond_signal (&src->queue_cond);
g_mutex_unlock (&src->queue_lock);
return TRUE;
}
static gboolean
shell_recorder_src_start (GstBaseSrc * base_src)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
g_mutex_lock (&src->queue_lock);
src->flushing = FALSE;
src->eos = FALSE;
g_cond_signal (&src->queue_cond);
g_mutex_unlock (&src->queue_lock);
return TRUE;
}
static gboolean
shell_recorder_src_stop (GstBaseSrc * base_src)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
g_mutex_lock (&src->queue_lock);
src->flushing = TRUE;
src->eos = FALSE;
g_queue_foreach (src->queue, (GFunc) gst_buffer_unref, NULL);
g_queue_clear (src->queue);
g_cond_signal (&src->queue_cond);
g_mutex_unlock (&src->queue_lock);
return TRUE;
}
static gboolean
shell_recorder_src_send_event (GstElement * element, GstEvent * event)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (element);
gboolean res;
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS)
{
shell_recorder_src_close (src);
gst_event_unref (event);
res = TRUE;
}
else
{
res = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, send_event, (element,
event), FALSE);
}
return res;
}
/* The create() virtual function is responsible for returning the next buffer.
* We just pop buffers off of the queue and block if necessary.
*/
static GstFlowReturn
shell_recorder_src_create (GstPushSrc *push_src,
GstBuffer **buffer_out)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (push_src);
GstBuffer *buffer;
g_mutex_lock (&src->queue_lock);
while (TRUE) {
/* int the flushing state we just return FLUSHING */
if (src->flushing) {
g_mutex_unlock (&src->queue_lock);
return GST_FLOW_FLUSHING;
}
buffer = g_queue_pop_head (src->queue);
/* we have a buffer, exit the loop to handle it */
if (buffer != NULL)
break;
/* no buffer, check EOS */
if (src->eos) {
g_mutex_unlock (&src->queue_lock);
return GST_FLOW_EOS;
}
/* wait for something to happen and try again */
g_cond_wait (&src->queue_cond, &src->queue_lock);
}
g_mutex_unlock (&src->queue_lock);
shell_recorder_src_update_memory_used (src,
- (int)(gst_buffer_get_size(buffer) / 1024));
*buffer_out = buffer;
return GST_FLOW_OK;
}
static void
shell_recorder_src_set_caps (ShellRecorderSrc *src,
const GstCaps *caps)
{
if (caps == src->caps)
return;
if (src->caps != NULL)
{
gst_caps_unref (src->caps);
src->caps = NULL;
}
if (caps)
{
/* The capabilities will be negotated with the downstream element
* and set on the pad when the first buffer is pushed.
*/
src->caps = gst_caps_copy (caps);
}
else
src->caps = NULL;
}
static void
shell_recorder_src_finalize (GObject *object)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (object);
if (src->memory_used_update_idle)
g_source_remove (src->memory_used_update_idle);
shell_recorder_src_set_caps (src, NULL);
g_queue_free_full (src->queue, (GDestroyNotify) gst_buffer_unref);
g_mutex_clear (&src->mutex);
g_mutex_clear (&src->queue_lock);
g_cond_clear (&src->queue_cond);
G_OBJECT_CLASS (shell_recorder_src_parent_class)->finalize (object);
}
static void
shell_recorder_src_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (object);
switch (prop_id)
{
case PROP_CAPS:
shell_recorder_src_set_caps (src, gst_value_get_caps (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_recorder_src_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ShellRecorderSrc *src = SHELL_RECORDER_SRC (object);
switch (prop_id)
{
case PROP_CAPS:
gst_value_set_caps (value, src->caps);
break;
case PROP_MEMORY_USED:
g_mutex_lock (&src->mutex);
g_value_set_uint (value, src->memory_used);
g_mutex_unlock (&src->mutex);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_recorder_src_class_init (ShellRecorderSrcClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);
GstPushSrcClass *push_src_class = GST_PUSH_SRC_CLASS (klass);
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
object_class->finalize = shell_recorder_src_finalize;
object_class->set_property = shell_recorder_src_set_property;
object_class->get_property = shell_recorder_src_get_property;
g_object_class_install_property (object_class,
PROP_CAPS,
g_param_spec_boxed ("caps",
"Caps",
"Fixed GstCaps for the source",
GST_TYPE_CAPS,
G_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_MEMORY_USED,
g_param_spec_uint ("memory-used",
"Memory Used",
"Memory currently used by the queue (in kB)",
0, G_MAXUINT, 0,
G_PARAM_READABLE));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details_simple (element_class,
"ShellRecorderSrc",
"Generic/Src",
"Feed screen capture data to a pipeline",
"Owen Taylor <otaylor@redhat.com>");
element_class->send_event = shell_recorder_src_send_event;
base_src_class->negotiate = shell_recorder_src_negotiate;
base_src_class->unlock = shell_recorder_src_unlock;
base_src_class->unlock_stop = shell_recorder_src_unlock_stop;
base_src_class->start = shell_recorder_src_start;
base_src_class->stop = shell_recorder_src_stop;
push_src_class->create = shell_recorder_src_create;
}
/**
* shell_recorder_src_add_buffer:
*
* Adds a buffer to the internal queue to be pushed out at the next opportunity.
* There is no flow control, so arbitrary amounts of memory may be used by
* the buffers on the queue. The buffer contents must match the #GstCaps
* set in the :caps property.
*/
void
shell_recorder_src_add_buffer (ShellRecorderSrc *src,
GstBuffer *buffer)
{
g_return_if_fail (SHELL_IS_RECORDER_SRC (src));
g_return_if_fail (src->caps != NULL);
shell_recorder_src_update_memory_used (src,
(int)(gst_buffer_get_size(buffer) / 1024));
g_mutex_lock (&src->queue_lock);
g_queue_push_tail (src->queue, gst_buffer_ref (buffer));
g_cond_signal (&src->queue_cond);
g_mutex_unlock (&src->queue_lock);
}
/**
* shell_recorder_src_close:
*
* Indicates the end of the input stream. Once all previously added buffers have
* been pushed out an end-of-stream message will be sent.
*/
void
shell_recorder_src_close (ShellRecorderSrc *src)
{
/* We can't send a message to the source immediately or buffers that haven't
* been pushed yet will be discarded. Instead mark ourselves EOS, which will
* make us send an event once everything has been pushed.
*/
g_mutex_lock (&src->queue_lock);
src->eos = TRUE;
g_cond_signal (&src->queue_cond);
g_mutex_unlock (&src->queue_lock);
}
static gboolean
plugin_init (GstPlugin *plugin)
{
gst_element_register(plugin, "shellrecordersrc", GST_RANK_NONE,
SHELL_TYPE_RECORDER_SRC);
return TRUE;
}
/**
* shell_recorder_src_register:
*
* Registers a plugin holding our single element to use privately in
* this application. Can safely be called multiple times.
*/
void
shell_recorder_src_register (void)
{
static gboolean registered = FALSE;
if (registered)
return;
gst_plugin_register_static (GST_VERSION_MAJOR, GST_VERSION_MINOR,
"shellrecorder",
"Plugin for ShellRecorder",
plugin_init,
"0.1",
"LGPL",
"gnome-shell", "gnome-shell", "http://live.gnome.org/GnomeShell");
registered = TRUE;
}