/**
* gst_video_buffer_set_overlay_composition:
* @buf: a #GstBuffer
* @comp: (allow-none): a #GstVideoOverlayComposition, or NULL to clear a
* previously-set composition
*
* Sets an overlay composition on a buffer. The buffer will obtain its own
* reference to the composition, meaning this function does not take ownership
* of @comp.
*
* Since: 0.10.36
*/
void
gst_video_buffer_set_overlay_composition (GstBuffer * buf,
GstVideoOverlayComposition * comp)
{
gst_buffer_set_qdata (buf, GST_OVERLAY_COMPOSITION_QUARK,
gst_structure_id_new (GST_OVERLAY_COMPOSITION_QUARK,
COMPOSITION_QUARK, GST_TYPE_VIDEO_OVERLAY_COMPOSITION, comp, NULL));
}
/**
* gst_query_new_uri:
*
* Constructs a new query URI query object. Use gst_query_unref()
* when done with it. An URI query is used to query the current URI
* that is used by the source or sink.
*
* Returns: A #GstQuery
*
* Since: 0.10.22
*/
GstQuery *
gst_query_new_uri (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_id_new (GST_QUARK (QUERY_URI),
GST_QUARK (URI), G_TYPE_STRING, NULL, NULL);
query = gst_query_new (GST_QUERY_URI, structure);
return query;
}
/**
* gst_query_new_duration:
* @format: the #GstFormat for this duration query
*
* Constructs a new stream duration query object to query in the given format.
* Use gst_query_unref() when done with it. A duration query will give the
* total length of the stream.
*
* Returns: A #GstQuery
*/
GstQuery *
gst_query_new_duration (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_id_new (GST_QUARK (QUERY_DURATION),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (DURATION), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new (GST_QUERY_DURATION, structure);
return query;
}
/**
* gst_event_new_latency:
* @latency: the new latency value
*
* Create a new latency event. The event is sent upstream from the sinks and
* notifies elements that they should add an additional @latency to the
* running time before synchronising against the clock.
*
* The latency is mostly used in live sinks and is always expressed in
* the time format.
*
* Returns: (transfer full): a new #GstEvent
*
* Since: 0.10.12
*/
GstEvent *
gst_event_new_latency (GstClockTime latency)
{
GstEvent *event;
GstStructure *structure;
GST_CAT_INFO (GST_CAT_EVENT,
"creating latency event %" GST_TIME_FORMAT, GST_TIME_ARGS (latency));
structure = gst_structure_id_new (GST_QUARK (EVENT_LATENCY),
GST_QUARK (LATENCY), G_TYPE_UINT64, latency, NULL);
event = gst_event_new_custom (GST_EVENT_LATENCY, structure);
return event;
}
/**
* gst_query_new_latency:
*
* Constructs a new latency query object.
* Use gst_query_unref() when done with it. A latency query is usually performed
* by sinks to compensate for additional latency introduced by elements in the
* pipeline.
*
* Returns: A #GstQuery
*
* Since: 0.10.12
*/
GstQuery *
gst_query_new_latency (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_id_new (GST_QUARK (QUERY_LATENCY),
GST_QUARK (LIVE), G_TYPE_BOOLEAN, FALSE,
GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (-1), NULL);
query = gst_query_new (GST_QUERY_LATENCY, structure);
return query;
}
/* FIXME 0.11: take ownership of msg for consistency? */
GstEvent *
gst_event_new_sink_message (GstMessage * msg)
{
GstEvent *event;
GstStructure *structure;
g_return_val_if_fail (msg != NULL, NULL);
GST_CAT_INFO (GST_CAT_EVENT, "creating sink-message event");
structure = gst_structure_id_new (GST_QUARK (EVENT_SINK_MESSAGE),
GST_QUARK (MESSAGE), GST_TYPE_MESSAGE, msg, NULL);
event = gst_event_new_custom (GST_EVENT_SINK_MESSAGE, structure);
return event;
}
/**
* gst_query_new_seeking:
* @format: the default #GstFormat for the new query
*
* Constructs a new query object for querying seeking properties of
* the stream.
*
* Returns: A #GstQuery
*/
GstQuery *
gst_query_new_seeking (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_id_new (GST_QUARK (QUERY_SEEKING),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, FALSE,
GST_QUARK (SEGMENT_START), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (SEGMENT_END), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new (GST_QUERY_SEEKING, structure);
return query;
}
/**
* gst_query_new_segment:
* @format: the #GstFormat for the new query
*
* Constructs a new segment query object. Use gst_query_unref()
* when done with it. A segment query is used to discover information about the
* currently configured segment for playback.
*
* Returns: a #GstQuery
*/
GstQuery *
gst_query_new_segment (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_id_new (GST_QUARK (QUERY_SEGMENT),
GST_QUARK (RATE), G_TYPE_DOUBLE, (gdouble) 0.0,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new (GST_QUERY_SEGMENT, structure);
return query;
}
/**
* gst_query_new_convert:
* @src_format: the source #GstFormat for the new query
* @value: the value to convert
* @dest_format: the target #GstFormat
*
* Constructs a new convert query object. Use gst_query_unref()
* when done with it. A convert query is used to ask for a conversion between
* one format and another.
*
* Returns: A #GstQuery
*/
GstQuery *
gst_query_new_convert (GstFormat src_format, gint64 value,
GstFormat dest_format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_id_new (GST_QUARK (QUERY_CONVERT),
GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
GST_QUARK (SRC_VALUE), G_TYPE_INT64, value,
GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
GST_QUARK (DEST_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new (GST_QUERY_CONVERT, structure);
return query;
}
/**
* gst_event_new_new_segment_full:
* @update: Whether this segment is an update to a previous one
* @rate: A new rate for playback
* @applied_rate: The rate factor which has already been applied
* @format: The format of the segment values
* @start: The start value of the segment
* @stop: The stop value of the segment
* @position: stream position
*
* Allocate a new newsegment event with the given format/values triplets.
*
* The newsegment event marks the range of buffers to be processed. All
* data not within the segment range is not to be processed. This can be
* used intelligently by plugins to apply more efficient methods of skipping
* unneeded data. The valid range is expressed with the @start and @stop
* values.
*
* The position value of the segment is used in conjunction with the start
* value to convert the buffer timestamps into the stream time. This is
* usually done in sinks to report the current stream_time.
* @position represents the stream_time of a buffer carrying a timestamp of
* @start. @position cannot be -1.
*
* @start cannot be -1, @stop can be -1. If there
* is a valid @stop given, it must be greater or equal the @start, including
* when the indicated playback @rate is < 0.
*
* The @applied_rate value provides information about any rate adjustment that
* has already been made to the timestamps and content on the buffers of the
* stream. (@rate * @applied_rate) should always equal the rate that has been
* requested for playback. For example, if an element has an input segment
* with intended playback @rate of 2.0 and applied_rate of 1.0, it can adjust
* incoming timestamps and buffer content by half and output a newsegment event
* with @rate of 1.0 and @applied_rate of 2.0
*
* After a newsegment event, the buffer stream time is calculated with:
*
* position + (TIMESTAMP(buf) - start) * ABS (rate * applied_rate)
*
* Returns: (transfer full): a new newsegment event.
*
* Since: 0.10.6
*/
GstEvent *
gst_event_new_new_segment_full (gboolean update, gdouble rate,
gdouble applied_rate, GstFormat format, gint64 start, gint64 stop,
gint64 position)
{
GstEvent *event;
GstStructure *structure;
g_return_val_if_fail (rate != 0.0, NULL);
g_return_val_if_fail (applied_rate != 0.0, NULL);
if (format == GST_FORMAT_TIME) {
GST_CAT_INFO (GST_CAT_EVENT,
"creating newsegment update %d, rate %lf, format GST_FORMAT_TIME, "
"start %" GST_TIME_FORMAT ", stop %" GST_TIME_FORMAT
", position %" GST_TIME_FORMAT,
update, rate, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop), GST_TIME_ARGS (position));
} else {
GST_CAT_INFO (GST_CAT_EVENT,
"creating newsegment update %d, rate %lf, format %s, "
"start %" G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", position %"
G_GINT64_FORMAT, update, rate, gst_format_get_name (format), start,
stop, position);
}
g_return_val_if_fail (position != -1, NULL);
g_return_val_if_fail (start != -1, NULL);
if (stop != -1)
g_return_val_if_fail (start <= stop, NULL);
structure = gst_structure_id_new (GST_QUARK (EVENT_NEWSEGMENT),
GST_QUARK (UPDATE), G_TYPE_BOOLEAN, update,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (APPLIED_RATE), G_TYPE_DOUBLE, applied_rate,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START), G_TYPE_INT64, start,
GST_QUARK (STOP), G_TYPE_INT64, stop,
GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
event = gst_event_new_custom (GST_EVENT_NEWSEGMENT, structure);
return event;
}
/**
* gst_event_new_buffer_size:
* @format: buffer format
* @minsize: minimum buffer size
* @maxsize: maximum buffer size
* @async: thread behavior
*
* Create a new buffersize event. The event is sent downstream and notifies
* elements that they should provide a buffer of the specified dimensions.
*
* When the @async flag is set, a thread boundary is preferred.
*
* Returns: (transfer full): a new #GstEvent
*/
GstEvent *
gst_event_new_buffer_size (GstFormat format, gint64 minsize,
gint64 maxsize, gboolean async)
{
GstEvent *event;
GstStructure *structure;
GST_CAT_INFO (GST_CAT_EVENT,
"creating buffersize format %s, minsize %" G_GINT64_FORMAT
", maxsize %" G_GINT64_FORMAT ", async %d", gst_format_get_name (format),
minsize, maxsize, async);
structure = gst_structure_id_new (GST_QUARK (EVENT_BUFFER_SIZE),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (MINSIZE), G_TYPE_INT64, minsize,
GST_QUARK (MAXSIZE), G_TYPE_INT64, maxsize,
GST_QUARK (ASYNC), G_TYPE_BOOLEAN, async, NULL);
event = gst_event_new_custom (GST_EVENT_BUFFERSIZE, structure);
return event;
}
/**
* gst_event_new_step:
* @format: the format of @amount
* @amount: the amount of data to step
* @rate: the step rate
* @flush: flushing steps
* @intermediate: intermediate steps
*
* Create a new step event. The purpose of the step event is to instruct a sink
* to skip @amount (expressed in @format) of media. It can be used to implement
* stepping through the video frame by frame or for doing fast trick modes.
*
* A rate of <= 0.0 is not allowed, pause the pipeline or reverse the playback
* direction of the pipeline to get the same effect.
*
* The @flush flag will clear any pending data in the pipeline before starting
* the step operation.
*
* The @intermediate flag instructs the pipeline that this step operation is
* part of a larger step operation.
*
* Returns: (transfer full): a new #GstEvent
*
* Since: 0.10.24
*/
GstEvent *
gst_event_new_step (GstFormat format, guint64 amount, gdouble rate,
gboolean flush, gboolean intermediate)
{
GstEvent *event;
GstStructure *structure;
g_return_val_if_fail (rate > 0.0, NULL);
GST_CAT_INFO (GST_CAT_EVENT, "creating step event");
structure = gst_structure_id_new (GST_QUARK (EVENT_STEP),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate, NULL);
event = gst_event_new_custom (GST_EVENT_STEP, structure);
return event;
}
/**
* gst_event_new_qos:
* @proportion: the proportion of the qos message
* @diff: The time difference of the last Clock sync
* @timestamp: The timestamp of the buffer
*
* Allocate a new qos event with the given values.
* The QOS event is generated in an element that wants an upstream
* element to either reduce or increase its rate because of
* high/low CPU load or other resource usage such as network performance.
* Typically sinks generate these events for each buffer they receive.
*
* @proportion indicates the real-time performance of the streaming in the
* element that generated the QoS event (usually the sink). The value is
* generally computed based on more long term statistics about the streams
* timestamps compared to the clock.
* A value < 1.0 indicates that the upstream element is producing data faster
* than real-time. A value > 1.0 indicates that the upstream element is not
* producing data fast enough. 1.0 is the ideal @proportion value. The
* proportion value can safely be used to lower or increase the quality of
* the element.
*
* @diff is the difference against the clock in running time of the last
* buffer that caused the element to generate the QOS event. A negative value
* means that the buffer with @timestamp arrived in time. A positive value
* indicates how late the buffer with @timestamp was.
*
* @timestamp is the timestamp of the last buffer that cause the element
* to generate the QOS event. It is expressed in running time and thus an ever
* increasing value.
*
* The upstream element can use the @diff and @timestamp values to decide
* whether to process more buffers. For possitive @diff, all buffers with
* timestamp <= @timestamp + @diff will certainly arrive late in the sink
* as well. A (negative) @diff value so that @timestamp + @diff would yield a
* result smaller than 0 is not allowed.
*
* The application can use general event probes to intercept the QoS
* event and implement custom application specific QoS handling.
*
* Returns: A new QOS event.
*/
GstEvent *
gst_event_new_qos (gdouble proportion, GstClockTimeDiff diff,
GstClockTime timestamp)
{
GstEvent *event;
GstStructure *structure;
/* diff must be positive or timestamp + diff must be positive */
g_return_val_if_fail (diff >= 0 || -diff <= timestamp, NULL);
GST_CAT_INFO (GST_CAT_EVENT,
"creating qos proportion %lf, diff %" G_GINT64_FORMAT
", timestamp %" GST_TIME_FORMAT, proportion,
diff, GST_TIME_ARGS (timestamp));
structure = gst_structure_id_new (GST_QUARK (EVENT_QOS),
GST_QUARK (PROPORTION), G_TYPE_DOUBLE, proportion,
GST_QUARK (DIFF), G_TYPE_INT64, diff,
GST_QUARK (TIMESTAMP), G_TYPE_UINT64, timestamp, NULL);
event = gst_event_new_custom (GST_EVENT_QOS, structure);
return event;
}
/**
* gst_event_new_seek:
* @rate: The new playback rate
* @format: The format of the seek values
* @flags: The optional seek flags
* @start_type: The type and flags for the new start position
* @start: The value of the new start position
* @stop_type: The type and flags for the new stop position
* @stop: The value of the new stop position
*
* Allocate a new seek event with the given parameters.
*
* The seek event configures playback of the pipeline between @start to @stop
* at the speed given in @rate, also called a playback segment.
* The @start and @stop values are expressed in @format.
*
* A @rate of 1.0 means normal playback rate, 2.0 means double speed.
* Negatives values means backwards playback. A value of 0.0 for the
* rate is not allowed and should be accomplished instead by PAUSING the
* pipeline.
*
* A pipeline has a default playback segment configured with a start
* position of 0, a stop position of -1 and a rate of 1.0. The currently
* configured playback segment can be queried with #GST_QUERY_SEGMENT.
*
* @start_type and @stop_type specify how to adjust the currently configured
* start and stop fields in playback segment. Adjustments can be made relative
* or absolute to the last configured values. A type of #GST_SEEK_TYPE_NONE
* means that the position should not be updated.
*
* When the rate is positive and @start has been updated, playback will start
* from the newly configured start position.
*
* For negative rates, playback will start from the newly configured stop
* position (if any). If the stop position if updated, it must be different from
* -1 for negative rates.
*
* It is not possible to seek relative to the current playback position, to do
* this, PAUSE the pipeline, query the current playback position with
* #GST_QUERY_POSITION and update the playback segment current position with a
* #GST_SEEK_TYPE_SET to the desired position.
*
* Returns: (transfer full): a new seek event.
*/
GstEvent *
gst_event_new_seek (gdouble rate, GstFormat format, GstSeekFlags flags,
GstSeekType start_type, gint64 start, GstSeekType stop_type, gint64 stop)
{
GstEvent *event;
GstStructure *structure;
g_return_val_if_fail (rate != 0.0, NULL);
if (format == GST_FORMAT_TIME) {
GST_CAT_INFO (GST_CAT_EVENT,
"creating seek rate %lf, format TIME, flags %d, "
"start_type %d, start %" GST_TIME_FORMAT ", "
"stop_type %d, stop %" GST_TIME_FORMAT,
rate, flags, start_type, GST_TIME_ARGS (start),
stop_type, GST_TIME_ARGS (stop));
} else {
GST_CAT_INFO (GST_CAT_EVENT,
"creating seek rate %lf, format %s, flags %d, "
"start_type %d, start %" G_GINT64_FORMAT ", "
"stop_type %d, stop %" G_GINT64_FORMAT,
rate, gst_format_get_name (format), flags, start_type, start, stop_type,
stop);
}
structure = gst_structure_id_new (GST_QUARK (EVENT_SEEK),
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (FLAGS), GST_TYPE_SEEK_FLAGS, flags,
GST_QUARK (CUR_TYPE), GST_TYPE_SEEK_TYPE, start_type,
GST_QUARK (CUR), G_TYPE_INT64, start,
GST_QUARK (STOP_TYPE), GST_TYPE_SEEK_TYPE, stop_type,
GST_QUARK (STOP), G_TYPE_INT64, stop, NULL);
event = gst_event_new_custom (GST_EVENT_SEEK, structure);
return event;
}
/**
* gst_query_new_buffering
* @format: the default #GstFormat for the new query
*
* Constructs a new query object for querying the buffering status of
* a stream.
*
* Returns: A #GstQuery
*
* Since: 0.10.20
*/
GstQuery *
gst_query_new_buffering (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
/* by default, we configure the answer as no buffering with a 100% buffering
* progress */
structure = gst_structure_id_new (GST_QUARK (QUERY_BUFFERING),
GST_QUARK (BUSY), G_TYPE_BOOLEAN, FALSE,
GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, 100,
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, G_GINT64_CONSTANT (0),
GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new (GST_QUERY_BUFFERING, structure);
return query;
}
