/**
* gst_app_sink_is_eos:
* @appsink: a #GstAppSink
*
* Check if @appsink is EOS, which is when no more samples can be pulled because
* an EOS event was received.
*
* This function also returns %TRUE when the appsink is not in the PAUSED or
* PLAYING state.
*
* Returns: %TRUE if no more samples can be pulled and the appsink is EOS.
*/
gboolean
gst_app_sink_is_eos (GstAppSink * appsink)
{
gboolean ret;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (priv->mutex);
if (!priv->started)
goto not_started;
if (priv->is_eos && priv->num_buffers == 0) {
GST_DEBUG_OBJECT (appsink, "we are EOS and the queue is empty");
ret = TRUE;
} else {
GST_DEBUG_OBJECT (appsink, "we are not yet EOS");
ret = FALSE;
}
g_mutex_unlock (priv->mutex);
return ret;
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return TRUE");
g_mutex_unlock (priv->mutex);
return TRUE;
}
}
/**
* gst_app_sink_is_eos:
* @appsink: a #GstAppSink
*
* Check if @appsink is EOS, which is when no more buffers can be pulled because
* an EOS event was received.
*
* This function also returns %TRUE when the appsink is not in the PAUSED or
* PLAYING state.
*
* Returns: %TRUE if no more buffers can be pulled and the appsink is EOS.
*
* Since: 0.10.22
*/
EXPORT_C gboolean
gst_app_sink_is_eos (GstAppSink * appsink)
{
gboolean ret;
g_return_val_if_fail (appsink != NULL, FALSE);
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
g_mutex_lock (appsink->priv->mutex);
if (!appsink->priv->started)
goto not_started;
if (appsink->priv->is_eos && g_queue_is_empty (appsink->priv->queue)) {
GST_DEBUG_OBJECT (appsink, "we are EOS and the queue is empty");
ret = TRUE;
} else {
GST_DEBUG_OBJECT (appsink, "we are not yet EOS");
ret = FALSE;
}
g_mutex_unlock (appsink->priv->mutex);
return ret;
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return TRUE");
g_mutex_unlock (appsink->priv->mutex);
return TRUE;
}
}
/**
* gst_app_sink_set_callbacks:
* @appsink: a #GstAppSink
* @callbacks: the callbacks
* @user_data: a user_data argument for the callbacks
* @notify: a destroy notify function
*
* Set callbacks which will be executed for each new preroll, new buffer and eos.
* This is an alternative to using the signals, it has lower overhead and is thus
* less expensive, but also less flexible.
*
* If callbacks are installed, no signals will be emited for performance
* reasons.
*
* Since: 0.10.23
*/
EXPORT_C void
gst_app_sink_set_callbacks (GstAppSink * appsink,
GstAppSinkCallbacks * callbacks, gpointer user_data, GDestroyNotify notify)
{
GDestroyNotify old_notify;
g_return_if_fail (appsink != NULL);
g_return_if_fail (GST_IS_APP_SINK (appsink));
g_return_if_fail (callbacks != NULL);
GST_OBJECT_LOCK (appsink);
old_notify = appsink->priv->notify;
if (old_notify) {
gpointer old_data;
old_data = appsink->priv->user_data;
appsink->priv->user_data = NULL;
appsink->priv->notify = NULL;
GST_OBJECT_UNLOCK (appsink);
old_notify (old_data);
GST_OBJECT_LOCK (appsink);
}
appsink->priv->callbacks = *callbacks;
appsink->priv->user_data = user_data;
appsink->priv->notify = notify;
GST_OBJECT_UNLOCK (appsink);
}
/**
* gst_app_sink_set_emit_signals:
* @appsink: a #GstAppSink
* @emit: the new state
*
* Make appsink emit the "new-preroll" and "new-buffer" signals. This option is
* by default disabled because signal emission is expensive and unneeded when
* the application prefers to operate in pull mode.
*
* Since: 0.10.22
*/
void
gst_app_sink_set_emit_signals (GstAppSink * appsink, gboolean emit)
{
g_return_if_fail (GST_IS_APP_SINK (appsink));
g_mutex_lock (appsink->priv->mutex);
appsink->priv->emit_signals = emit;
g_mutex_unlock (appsink->priv->mutex);
}
GstSample *
gst_app_sink_pull_sample (GstAppSink * appsink)
{
GstSample *sample = NULL;
GstBuffer *buffer;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab a buffer");
if (!priv->started)
goto not_started;
if (priv->num_buffers > 0)
break;
if (priv->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for a buffer");
g_cond_wait (&priv->cond, &priv->mutex);
}
buffer = dequeue_buffer (appsink);
GST_DEBUG_OBJECT (appsink, "we have a buffer %p", buffer);
sample = gst_sample_new (buffer, priv->last_caps, &priv->last_segment, NULL);
gst_buffer_unref (buffer);
g_cond_signal (&priv->cond);
g_mutex_unlock (&priv->mutex);
return sample;
/* special conditions */
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
}
/**
* gst_app_sink_get_drop:
* @appsink: a #GstAppSink
*
* Check if @appsink will drop old buffers when the maximum amount of queued
* buffers is reached.
*
* Returns: %TRUE if @appsink is dropping old buffers when the queue is
* filled.
*
* Since: 0.10.22
*/
gboolean
gst_app_sink_get_drop (GstAppSink * appsink)
{
gboolean result;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
g_mutex_lock (appsink->priv->mutex);
result = appsink->priv->drop;
g_mutex_unlock (appsink->priv->mutex);
return result;
}
/**
* gst_app_sink_set_drop:
* @appsink: a #GstAppSink
* @drop: the new state
*
* Instruct @appsink to drop old buffers when the maximum amount of queued
* buffers is reached.
*
* Since: 0.10.22
*/
void
gst_app_sink_set_drop (GstAppSink * appsink, gboolean drop)
{
g_return_if_fail (GST_IS_APP_SINK (appsink));
g_mutex_lock (appsink->priv->mutex);
if (appsink->priv->drop != drop) {
appsink->priv->drop = drop;
/* signal the change */
g_cond_signal (appsink->priv->cond);
}
g_mutex_unlock (appsink->priv->mutex);
}
/**
* gst_app_sink_get_max_buffers:
* @appsink: a #GstAppSink
*
* Get the maximum amount of buffers that can be queued in @appsink.
*
* Returns: The maximum amount of buffers that can be queued.
*
* Since: 0.10.22
*/
guint
gst_app_sink_get_max_buffers (GstAppSink * appsink)
{
guint result;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), 0);
g_mutex_lock (appsink->priv->mutex);
result = appsink->priv->max_buffers;
g_mutex_unlock (appsink->priv->mutex);
return result;
}
/**
* gst_app_sink_set_max_buffers:
* @appsink: a #GstAppSink
* @max: the maximum number of buffers to queue
*
* Set the maximum amount of buffers that can be queued in @appsink. After this
* amount of buffers are queued in appsink, any more buffers will block upstream
* elements until a buffer is pulled from @appsink.
*
* Since: 0.10.22
*/
void
gst_app_sink_set_max_buffers (GstAppSink * appsink, guint max)
{
g_return_if_fail (GST_IS_APP_SINK (appsink));
g_mutex_lock (appsink->priv->mutex);
if (max != appsink->priv->max_buffers) {
appsink->priv->max_buffers = max;
/* signal the change */
g_cond_signal (appsink->priv->cond);
}
g_mutex_unlock (appsink->priv->mutex);
}
/**
* gst_app_sink_get_emit_signals:
* @appsink: a #GstAppSink
*
* Check if appsink will emit the "new-preroll" and "new-buffer" signals.
*
* Returns: %TRUE if @appsink is emiting the "new-preroll" and "new-buffer"
* signals.
*
* Since: 0.10.22
*/
EXPORT_C gboolean
gst_app_sink_get_emit_signals (GstAppSink * appsink)
{
gboolean result;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
g_mutex_lock (appsink->priv->mutex);
result = appsink->priv->emit_signals;
g_mutex_unlock (appsink->priv->mutex);
return result;
}
/**
* gst_app_sink_pull_preroll:
* @appsink: a #GstAppSink
*
* Get the last preroll sample in @appsink. This was the sample that caused the
* appsink to preroll in the PAUSED state. This sample can be pulled many times
* and remains available to the application even after EOS.
*
* This function is typically used when dealing with a pipeline in the PAUSED
* state. Calling this function after doing a seek will give the sample right
* after the seek position.
*
* Note that the preroll sample will also be returned as the first sample
* when calling gst_app_sink_pull_sample().
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* This function blocks until a preroll sample or EOS is received or the appsink
* element is set to the READY/NULL state.
*
* Returns: (transfer full): a #GstSample or NULL when the appsink is stopped or EOS.
* Call gst_sample_unref() after usage.
*/
GstSample *
gst_app_sink_pull_preroll (GstAppSink * appsink)
{
GstSample *sample = NULL;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab a buffer");
if (!priv->started)
goto not_started;
if (priv->preroll != NULL)
break;
if (priv->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for the preroll buffer");
g_cond_wait (&priv->cond, &priv->mutex);
}
sample =
gst_sample_new (priv->preroll, priv->preroll_caps, &priv->preroll_segment,
NULL);
GST_DEBUG_OBJECT (appsink, "we have the preroll sample %p", sample);
g_mutex_unlock (&priv->mutex);
return sample;
/* special conditions */
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
}
/**
* gst_app_sink_get_caps:
* @appsink: a #GstAppSink
*
* Get the configured caps on @appsink.
*
* Returns: the #GstCaps accepted by the sink. gst_caps_unref() after usage.
*
* Since: 0.10.22
*/
GstCaps *
gst_app_sink_get_caps (GstAppSink * appsink)
{
GstCaps *caps;
g_return_val_if_fail (appsink != NULL, NULL);
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
GST_OBJECT_LOCK (appsink);
if ((caps = appsink->priv->caps))
gst_caps_ref (caps);
GST_DEBUG_OBJECT (appsink, "getting caps of %" GST_PTR_FORMAT, caps);
GST_OBJECT_UNLOCK (appsink);
return caps;
}
/**
* gst_app_sink_get_wait_on_eos:
* @appsink: a #GstAppSink
*
* Check if @appsink will wait for all buffers to be consumed when an EOS is
* received.
*
* Returns: %TRUE if @appsink will wait for all buffers to be consumed when an
* EOS is received.
*/
gboolean
gst_app_sink_get_wait_on_eos (GstAppSink * appsink)
{
gboolean result;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
result = priv->wait_on_eos;
g_mutex_unlock (&priv->mutex);
return result;
}
/**
* gst_app_sink_pull_buffer:
* @appsink: a #GstAppSink
*
* This function blocks until a buffer or EOS becomes available or the appsink
* element is set to the READY/NULL state.
*
* This function will only return buffers when the appsink is in the PLAYING
* state. All rendered buffers will be put in a queue so that the application
* can pull buffers at its own rate. Note that when the application does not
* pull buffers fast enough, the queued buffers could consume a lot of memory,
* especially when dealing with raw video frames.
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* Returns: a #GstBuffer or NULL when the appsink is stopped or EOS.
*/
GstBuffer *
gst_app_sink_pull_buffer (GstAppSink * appsink)
{
GstBuffer *buf = NULL;
//printf("pull_buffer\n");
g_return_val_if_fail (appsink != NULL, NULL);
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
g_mutex_lock (appsink->mutex);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab a buffer");
if (!appsink->started)
goto not_started;
if (!g_queue_is_empty (appsink->queue))
break;
if (appsink->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for a buffer");
g_cond_wait (appsink->cond, appsink->mutex);
}
buf = (GstBuffer*)g_queue_pop_head (appsink->queue);
GST_DEBUG_OBJECT (appsink, "we have a buffer %p", buf);
g_mutex_unlock (appsink->mutex);
return buf;
/* special conditions */
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (appsink->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (appsink->mutex);
return NULL;
}
}
static GstMiniObject *
gst_app_sink_pull_object (GstAppSink * appsink)
{
GstMiniObject *obj = NULL;
g_return_val_if_fail (appsink != NULL, NULL);
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
g_mutex_lock (appsink->priv->mutex);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab a buffer/list");
if (!appsink->priv->started)
goto not_started;
if (!g_queue_is_empty (appsink->priv->queue))
break;
if (appsink->priv->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for a buffer/list");
g_cond_wait (appsink->priv->cond, appsink->priv->mutex);
}
obj = g_queue_pop_head (appsink->priv->queue);
GST_DEBUG_OBJECT (appsink, "we have a buffer/list %p", obj);
g_cond_signal (appsink->priv->cond);
g_mutex_unlock (appsink->priv->mutex);
return obj;
/* special conditions */
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (appsink->priv->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (appsink->priv->mutex);
return NULL;
}
}
/**
* gst_app_sink_set_wait_on_eos:
* @appsink: a #GstAppSink
* @wait: the new state
*
* Instruct @appsink to wait for all buffers to be consumed when an EOS is received.
*
*/
void
gst_app_sink_set_wait_on_eos (GstAppSink * appsink, gboolean wait)
{
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
if (priv->wait_on_eos != wait) {
priv->wait_on_eos = wait;
/* signal the change */
g_cond_signal (&priv->cond);
}
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_sink_pull_preroll:
* @appsink: a #GstAppSink
*
* Get the last preroll buffer in @appsink. This was the buffer that caused the
* appsink to preroll in the PAUSED state. This buffer can be pulled many times
* and remains available to the application even after EOS.
*
* This function is typically used when dealing with a pipeline in the PAUSED
* state. Calling this function after doing a seek will give the buffer right
* after the seek position.
*
* Note that the preroll buffer will also be returned as the first buffer
* when calling gst_app_sink_pull_buffer().
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* This function blocks until a preroll buffer or EOS is received or the appsink
* element is set to the READY/NULL state.
*
* Returns: a #GstBuffer or NULL when the appsink is stopped or EOS.
*
* Since: 0.10.22
*/
GstBuffer *
gst_app_sink_pull_preroll (GstAppSink * appsink)
{
GstBuffer *buf = NULL;
g_return_val_if_fail (appsink != NULL, NULL);
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
g_mutex_lock (appsink->priv->mutex);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab a buffer");
if (!appsink->priv->started)
goto not_started;
if (appsink->priv->preroll != NULL)
break;
if (appsink->priv->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for the preroll buffer");
g_cond_wait (appsink->priv->cond, appsink->priv->mutex);
}
buf = gst_buffer_ref (appsink->priv->preroll);
GST_DEBUG_OBJECT (appsink, "we have the preroll buffer %p", buf);
g_mutex_unlock (appsink->priv->mutex);
return buf;
/* special conditions */
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (appsink->priv->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (appsink->priv->mutex);
return NULL;
}
}
/**
* gst_app_sink_set_caps:
* @appsink: a #GstAppSink
* @caps: caps to set
*
* Set the capabilities on the appsink element. This function takes
* a copy of the caps structure. After calling this method, the sink will only
* accept caps that match @caps. If @caps is non-fixed, you must check the caps
* on the buffers to get the actual used caps.
*/
void
gst_app_sink_set_caps (GstAppSink * appsink, const GstCaps * caps)
{
GstCaps *old;
g_return_if_fail (appsink != NULL);
g_return_if_fail (GST_IS_APP_SINK (appsink));
GST_OBJECT_LOCK (appsink);
GST_DEBUG_OBJECT (appsink, "setting caps to %" GST_PTR_FORMAT, caps);
old = appsink->caps;
if (caps)
appsink->caps = gst_caps_copy (caps);
else
appsink->caps = NULL;
if (old)
gst_caps_unref (old);
GST_OBJECT_UNLOCK (appsink);
}
/**
* gst_app_sink_set_caps:
* @appsink: a #GstAppSink
* @caps: caps to set
*
* Set the capabilities on the appsink element. This function takes
* a copy of the caps structure. After calling this method, the sink will only
* accept caps that match @caps. If @caps is non-fixed, or incomplete,
* you must check the caps on the samples to get the actual used caps.
*/
void
gst_app_sink_set_caps (GstAppSink * appsink, const GstCaps * caps)
{
GstCaps *old;
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
GST_OBJECT_LOCK (appsink);
GST_DEBUG_OBJECT (appsink, "setting caps to %" GST_PTR_FORMAT, caps);
if ((old = priv->caps) != caps) {
if (caps)
priv->caps = gst_caps_copy (caps);
else
priv->caps = NULL;
if (old)
gst_caps_unref (old);
}
GST_OBJECT_UNLOCK (appsink);
}