gstreamer/subprojects/gst-plugins-bad/gst/codectimestamper/gstcodectimestamper.c

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/* GStreamer
* Copyright (C) 2022 Seungha Yang <seungha@centricular.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.
*/
/* TODO:
* Parse POC and correct PTS if it's is unknown
* Reverse playback support
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/base/base.h>
#include "gstcodectimestamper.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_codec_timestamper_debug);
#define GST_CAT_DEFAULT gst_codec_timestamper_debug
typedef struct
{
GstBuffer *buffer;
GList *events;
GstClockTime pts;
} GstCodecTimestamperFrame;
struct _GstCodecTimestamperPrivate
{
GRecMutex lock;
GstSegment in_segment;
GList *current_frame_events;
GstQueueArray *queue;
GArray *timestamp_queue;
gint fps_n;
gint fps_d;
guint max_bframes;
guint max_dpb_frames;
guint max_reorder_frames;
gboolean interlaced;
guint window_size;
GstClockTime last_dts;
GstClockTime dts_offset;
GstClockTime time_adjustment;
GstClockTime last_pts;
GstClockTime latency;
};
static void gst_codec_timestamper_class_init (GstCodecTimestamperClass * klass);
static void gst_codec_timestamper_init (GstCodecTimestamper * self,
GstCodecTimestamperClass * klass);
static void gst_codec_timestamper_finalize (GObject * object);
static GstFlowReturn gst_codec_timestamper_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static gboolean gst_codec_timestamper_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_codec_timestamper_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_codec_timestamper_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GstCaps *gst_timestamper_get_caps (GstCodecTimestamper * self,
GstCaps * filter);
static GstStateChangeReturn gst_codec_timestamper_change_state (GstElement *
element, GstStateChange transition);
static void gst_codec_timestamper_clear_frame (GstCodecTimestamperFrame *
frame);
static void gst_codec_timestamper_reset (GstCodecTimestamper * self);
static void gst_codec_timestamper_drain (GstCodecTimestamper * self);
static GTypeClass *parent_class = NULL;
static gint private_offset = 0;
/* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
* method to get to the padtemplates */
GType
gst_codec_timestamper_get_type (void)
{
static gsize type = 0;
if (g_once_init_enter (&type)) {
GType _type;
static const GTypeInfo info = {
sizeof (GstCodecTimestamperClass),
NULL,
NULL,
(GClassInitFunc) gst_codec_timestamper_class_init,
NULL,
NULL,
sizeof (GstCodecTimestamper),
0,
(GInstanceInitFunc) gst_codec_timestamper_init,
};
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstCodecTimestamper", &info, G_TYPE_FLAG_ABSTRACT);
private_offset = g_type_add_instance_private (_type,
sizeof (GstCodecTimestamperPrivate));
g_once_init_leave (&type, _type);
}
return type;
}
static inline GstCodecTimestamperPrivate *
gst_codec_timestamper_get_instance_private (GstCodecTimestamper * self)
{
return (G_STRUCT_MEMBER_P (self, private_offset));
}
static void
gst_codec_timestamper_class_init (GstCodecTimestamperClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
if (private_offset)
g_type_class_adjust_private_offset (klass, &private_offset);
object_class->finalize = gst_codec_timestamper_finalize;
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_codec_timestamper_change_state);
/* Default implementation is correct for both H264 and H265 */
klass->get_sink_caps = gst_timestamper_get_caps;
GST_DEBUG_CATEGORY_INIT (gst_codec_timestamper_debug, "codectimestamper", 0,
"codectimestamper");
/**
* GstCodecTimestamper:
*
* Since: 1.22
*/
gst_type_mark_as_plugin_api (GST_TYPE_CODEC_TIMESTAMPER, 0);
}
static void
gst_codec_timestamper_init (GstCodecTimestamper * self,
GstCodecTimestamperClass * klass)
{
GstCodecTimestamperPrivate *priv;
GstPadTemplate *template;
self->priv = priv = gst_codec_timestamper_get_instance_private (self);
template = gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass),
"sink");
self->sinkpad = gst_pad_new_from_template (template, "sink");
gst_pad_set_chain_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_codec_timestamper_chain));
gst_pad_set_event_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_codec_timestamper_sink_event));
gst_pad_set_query_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_codec_timestamper_sink_query));
GST_PAD_SET_PROXY_SCHEDULING (self->sinkpad);
GST_PAD_SET_ACCEPT_INTERSECT (self->sinkpad);
GST_PAD_SET_ACCEPT_TEMPLATE (self->sinkpad);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
template = gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass),
"src");
self->srcpad = gst_pad_new_from_template (template, "src");
gst_pad_set_query_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_codec_timestamper_src_query));
GST_PAD_SET_PROXY_SCHEDULING (self->srcpad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
priv->queue =
gst_queue_array_new_for_struct (sizeof (GstCodecTimestamperFrame), 16);
gst_queue_array_set_clear_func (priv->queue,
(GDestroyNotify) gst_codec_timestamper_clear_frame);
priv->timestamp_queue =
g_array_sized_new (FALSE, FALSE, sizeof (GstClockTime), 16);
g_rec_mutex_init (&priv->lock);
gst_segment_init (&priv->in_segment, GST_FORMAT_TIME);
}
static void
gst_codec_timestamper_finalize (GObject * object)
{
GstCodecTimestamper *self = GST_CODEC_TIMESTAMPER (object);
GstCodecTimestamperPrivate *priv = self->priv;
gst_queue_array_free (priv->queue);
g_array_unref (priv->timestamp_queue);
g_rec_mutex_clear (&priv->lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_codec_timestamper_set_caps (GstCodecTimestamper * self, GstCaps * caps)
{
GstCodecTimestamperClass *klass = GST_CODEC_TIMESTAMPER_GET_CLASS (self);
GstCodecTimestamperPrivate *priv = self->priv;
GstStructure *s = gst_caps_get_structure (caps, 0);
priv->fps_n = 0;
priv->fps_d = 1;
gst_structure_get_fraction (s, "framerate", &priv->fps_n, &priv->fps_d);
if (priv->fps_n <= 0 || priv->fps_d <= 0) {
GST_WARNING_OBJECT (self, "Unknown frame rate, assume 25/1");
priv->fps_n = 25;
priv->fps_d = 1;
}
if (!klass->set_caps (self, caps))
return FALSE;
return TRUE;
}
static gboolean
gst_codec_timestamper_push_event (GstCodecTimestamper * self, GstEvent * event)
{
GstCodecTimestamperPrivate *priv = self->priv;
if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
GstSegment segment;
guint32 seqnum;
gst_event_copy_segment (event, &segment);
if (segment.format != GST_FORMAT_TIME) {
GST_ELEMENT_ERROR (self, CORE, EVENT, (NULL),
("Non-time format segment"));
gst_event_unref (event);
return FALSE;
}
if (priv->time_adjustment != GST_CLOCK_TIME_NONE) {
segment.start += priv->time_adjustment;
if (GST_CLOCK_TIME_IS_VALID (segment.position))
segment.position += priv->time_adjustment;
if (GST_CLOCK_TIME_IS_VALID (segment.stop))
segment.stop += priv->time_adjustment;
}
seqnum = gst_event_get_seqnum (event);
gst_event_unref (event);
event = gst_event_new_segment (&segment);
gst_event_set_seqnum (event, seqnum);
}
return gst_pad_push_event (self->srcpad, event);
}
static void
gst_codec_timestamper_flush_events (GstCodecTimestamper * self, GList ** events)
{
GList *iter;
for (iter = *events; iter; iter = g_list_next (iter)) {
GstEvent *ev = GST_EVENT (iter->data);
if (GST_EVENT_IS_STICKY (ev) && GST_EVENT_TYPE (ev) != GST_EVENT_EOS &&
GST_EVENT_TYPE (ev) != GST_EVENT_SEGMENT) {
gst_pad_store_sticky_event (self->srcpad, ev);
}
gst_event_unref (ev);
}
g_clear_pointer (events, g_list_free);
}
static void
gst_codec_timestamper_flush (GstCodecTimestamper * self)
{
GstCodecTimestamperPrivate *priv = self->priv;
while (gst_queue_array_get_length (priv->queue) > 0) {
GstCodecTimestamperFrame *frame = (GstCodecTimestamperFrame *)
gst_queue_array_pop_head_struct (priv->queue);
gst_codec_timestamper_flush_events (self, &frame->events);
gst_codec_timestamper_clear_frame (frame);
}
gst_codec_timestamper_flush_events (self, &priv->current_frame_events);
priv->time_adjustment = GST_CLOCK_TIME_NONE;
priv->last_dts = GST_CLOCK_TIME_NONE;
priv->last_pts = GST_CLOCK_TIME_NONE;
g_rec_mutex_lock (&priv->lock);
priv->latency = GST_CLOCK_TIME_NONE;
g_rec_mutex_unlock (&priv->lock);
}
static gboolean
gst_codec_timestamper_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstCodecTimestamper *self = GST_CODEC_TIMESTAMPER (parent);
GstCodecTimestamperPrivate *priv = self->priv;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
gst_codec_timestamper_set_caps (self, caps);
break;
}
case GST_EVENT_SEGMENT:{
GstSegment segment;
gst_event_copy_segment (event, &segment);
if (segment.format != GST_FORMAT_TIME) {
GST_WARNING_OBJECT (self, "Not a time format segment");
gst_event_unref (event);
return FALSE;
}
if (segment.rate < 0) {
GST_WARNING_OBJECT (self, "Negative rate is not supported");
gst_event_unref (event);
return FALSE;
}
/* Drain on segment update */
if (!gst_segment_is_equal (&priv->in_segment, &segment))
gst_codec_timestamper_drain (self);
priv->in_segment = segment;
break;
}
case GST_EVENT_EOS:
gst_codec_timestamper_drain (self);
if (priv->current_frame_events) {
GList *iter;
for (iter = priv->current_frame_events; iter; iter = g_list_next (iter))
gst_codec_timestamper_push_event (self, GST_EVENT (iter->data));
g_clear_pointer (&priv->current_frame_events, g_list_free);
}
break;
case GST_EVENT_FLUSH_STOP:
gst_codec_timestamper_flush (self);
break;
default:
break;
}
if (!GST_EVENT_IS_SERIALIZED (event) ||
GST_EVENT_TYPE (event) == GST_EVENT_EOS ||
GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP) {
return gst_pad_event_default (pad, parent, event);
}
/* Store event to serialize queued frames */
priv->current_frame_events = g_list_append (priv->current_frame_events,
event);
return TRUE;
}
static void
gst_codec_timestamper_frame_init (GstCodecTimestamperFrame * frame)
{
memset (frame, 0, sizeof (GstCodecTimestamperFrame));
frame->pts = GST_CLOCK_TIME_NONE;
}
static void
gst_codec_timestamper_clear_frame (GstCodecTimestamperFrame * frame)
{
if (!frame)
return;
gst_clear_buffer (&frame->buffer);
if (frame->events) {
g_list_free_full (frame->events, (GDestroyNotify) gst_event_unref);
frame->events = NULL;
}
}
static GstFlowReturn
gst_codec_timestamper_output_frame (GstCodecTimestamper * self,
GstCodecTimestamperFrame * frame)
{
GstCodecTimestamperPrivate *priv = self->priv;
GList *iter;
GstFlowReturn ret;
GstClockTime dts = GST_CLOCK_TIME_NONE;
for (iter = frame->events; iter; iter = g_list_next (iter)) {
GstEvent *event = GST_EVENT (iter->data);
gst_codec_timestamper_push_event (self, event);
}
g_clear_pointer (&frame->events, g_list_free);
if (GST_CLOCK_TIME_IS_VALID (frame->pts)) {
g_assert (priv->timestamp_queue->len > 0);
dts = g_array_index (priv->timestamp_queue, GstClockTime, 0);
g_array_remove_index (priv->timestamp_queue, 0);
if (GST_CLOCK_TIME_IS_VALID (priv->dts_offset))
dts -= priv->dts_offset;
}
if (GST_CLOCK_TIME_IS_VALID (dts)) {
if (!GST_CLOCK_TIME_IS_VALID (priv->last_dts))
priv->last_dts = dts;
/* make sure DTS <= PTS */
if (GST_CLOCK_TIME_IS_VALID (frame->pts)) {
if (dts > frame->pts) {
if (frame->pts >= priv->last_dts)
dts = frame->pts;
else
dts = GST_CLOCK_TIME_NONE;
}
if (GST_CLOCK_TIME_IS_VALID (dts))
priv->last_dts = dts;
}
}
frame->buffer = gst_buffer_make_writable (frame->buffer);
GST_BUFFER_PTS (frame->buffer) = frame->pts;
GST_BUFFER_DTS (frame->buffer) = dts;
GST_LOG_OBJECT (self, "Output %" GST_PTR_FORMAT, frame->buffer);
ret = gst_pad_push (self->srcpad, g_steal_pointer (&frame->buffer));
return ret;
}
static GstFlowReturn
gst_codec_timestamper_process_output_frame (GstCodecTimestamper * self)
{
GstCodecTimestamperPrivate *priv = self->priv;
guint len;
GstCodecTimestamperFrame *frame;
len = gst_queue_array_get_length (priv->queue);
if (len < priv->window_size) {
GST_TRACE_OBJECT (self, "Need more data, queued %d/%d", len,
priv->window_size);
return GST_FLOW_OK;
}
frame = (GstCodecTimestamperFrame *)
gst_queue_array_pop_head_struct (priv->queue);
return gst_codec_timestamper_output_frame (self, frame);
}
static void
gst_codec_timestamper_drain (GstCodecTimestamper * self)
{
GstCodecTimestamperPrivate *priv = self->priv;
GST_DEBUG_OBJECT (self, "Draining");
while (gst_queue_array_get_length (priv->queue) > 0) {
GstCodecTimestamperFrame *frame = (GstCodecTimestamperFrame *)
gst_queue_array_pop_head_struct (priv->queue);
gst_codec_timestamper_output_frame (self, frame);
}
GST_DEBUG_OBJECT (self, "Drained");
}
static gint
pts_compare_func (const GstClockTime * a, const GstClockTime * b)
{
return (*a) - (*b);
}
static GstFlowReturn
gst_codec_timestamper_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstCodecTimestamper *self = GST_CODEC_TIMESTAMPER (parent);
GstCodecTimestamperPrivate *priv = self->priv;
GstCodecTimestamperClass *klass = GST_CODEC_TIMESTAMPER_GET_CLASS (self);
GstClockTime pts, dts;
/* The same hack as x264 for negative DTS */
static const GstClockTime min_pts = GST_SECOND * 60 * 60 * 1000;
GstCodecTimestamperFrame frame;
GstFlowReturn ret;
gst_codec_timestamper_frame_init (&frame);
GST_LOG_OBJECT (self, "Handle %" GST_PTR_FORMAT, buffer);
pts = GST_BUFFER_PTS (buffer);
dts = GST_BUFFER_DTS (buffer);
if (!GST_CLOCK_TIME_IS_VALID (priv->time_adjustment)) {
GstClockTime start_time = GST_CLOCK_TIME_NONE;
if (GST_CLOCK_TIME_IS_VALID (pts)) {
GST_DEBUG_OBJECT (self, "Got valid PTS: %" GST_TIME_FORMAT,
GST_TIME_ARGS (pts));
start_time = MAX (pts, priv->in_segment.start);
} else if (GST_CLOCK_TIME_IS_VALID (dts)) {
GST_DEBUG_OBJECT (self, "Got valid DTS: %" GST_TIME_FORMAT,
GST_TIME_ARGS (dts));
start_time = MAX (dts, priv->in_segment.start);
} else {
GST_WARNING_OBJECT (self, "Both PTS and DTS are invalid");
start_time = priv->in_segment.start;
}
if (start_time < min_pts) {
priv->time_adjustment = min_pts - start_time;
GST_DEBUG_OBJECT (self, "Updating time-adjustment %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->time_adjustment));
}
}
if (GST_CLOCK_TIME_IS_VALID (priv->time_adjustment)) {
if (GST_CLOCK_TIME_IS_VALID (pts))
pts += priv->time_adjustment;
if (GST_CLOCK_TIME_IS_VALID (dts))
dts += priv->time_adjustment;
}
ret = klass->handle_buffer (self, buffer);
if (ret != GST_FLOW_OK) {
GST_INFO_OBJECT (self, "Handle buffer returned %s",
gst_flow_get_name (ret));
gst_buffer_unref (buffer);
return ret;
}
/* workaround h264/5parse producing pts=NONE buffers when provided with
* the same timestamps on sequential buffers */
if (GST_CLOCK_TIME_IS_VALID (pts)) {
priv->last_pts = pts;
} else if (GST_CLOCK_TIME_IS_VALID (priv->last_pts)) {
pts = priv->last_pts;
}
frame.pts = pts;
frame.buffer = buffer;
frame.events = priv->current_frame_events;
priv->current_frame_events = NULL;
GST_LOG_OBJECT (self, "Enqueue frame, buffer pts %" GST_TIME_FORMAT
", adjusted pts %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)), GST_TIME_ARGS (pts));
gst_queue_array_push_tail_struct (priv->queue, &frame);
if (GST_CLOCK_TIME_IS_VALID (frame.pts)) {
g_array_append_val (priv->timestamp_queue, frame.pts);
g_array_sort (priv->timestamp_queue, (GCompareFunc) pts_compare_func);
}
return gst_codec_timestamper_process_output_frame (self);
}
static GstCaps *
gst_timestamper_get_caps (GstCodecTimestamper * self, GstCaps * filter)
{
GstCaps *peercaps, *templ;
GstCaps *res, *tmp, *pcopy;
templ = gst_pad_get_pad_template_caps (self->sinkpad);
if (filter) {
GstCaps *fcopy = gst_caps_copy (filter);
peercaps = gst_pad_peer_query_caps (self->srcpad, fcopy);
gst_caps_unref (fcopy);
} else {
peercaps = gst_pad_peer_query_caps (self->srcpad, NULL);
}
pcopy = gst_caps_copy (peercaps);
res = gst_caps_intersect_full (pcopy, templ, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (pcopy);
gst_caps_unref (templ);
if (filter) {
GstCaps *tmp = gst_caps_intersect_full (res, filter,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (res);
res = tmp;
}
/* Try if we can put the downstream caps first */
pcopy = gst_caps_copy (peercaps);
tmp = gst_caps_intersect_full (pcopy, res, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (pcopy);
if (!gst_caps_is_empty (tmp))
res = gst_caps_merge (tmp, res);
else
gst_caps_unref (tmp);
gst_caps_unref (peercaps);
return res;
}
static gboolean
gst_codec_timestamper_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstCodecTimestamper *self = GST_CODEC_TIMESTAMPER (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *caps, *filter;
GstCodecTimestamperClass *klass = GST_CODEC_TIMESTAMPER_GET_CLASS (self);
gst_query_parse_caps (query, &filter);
g_assert (klass->get_sink_caps);
caps = klass->get_sink_caps (self, filter);
GST_LOG_OBJECT (self, "sink getcaps returning caps %" GST_PTR_FORMAT,
caps);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
return TRUE;
}
default:
break;
}
return gst_pad_query_default (pad, parent, query);
}
static gboolean
gst_codec_timestamper_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstCodecTimestamper *self = GST_CODEC_TIMESTAMPER (parent);
GstCodecTimestamperPrivate *priv = self->priv;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:{
gboolean ret;
ret = gst_pad_peer_query (self->sinkpad, query);
if (ret) {
GstClockTime min, max;
gboolean live;
gst_query_parse_latency (query, &live, &min, &max);
g_rec_mutex_lock (&priv->lock);
if (GST_CLOCK_TIME_IS_VALID (priv->latency))
min += priv->latency;
g_rec_mutex_unlock (&priv->lock);
gst_query_set_latency (query, live, min, max);
}
return ret;
}
default:
break;
}
return gst_pad_query_default (pad, parent, query);
}
static void
gst_codec_timestamper_reset (GstCodecTimestamper * self)
{
GstCodecTimestamperPrivate *priv = self->priv;
gst_queue_array_clear (priv->queue);
g_array_set_size (priv->timestamp_queue, 0);
priv->fps_n = 0;
priv->fps_d = 1;
priv->dts_offset = 0;
priv->time_adjustment = GST_CLOCK_TIME_NONE;
priv->latency = GST_CLOCK_TIME_NONE;
priv->window_size = 0;
priv->last_dts = GST_CLOCK_TIME_NONE;
priv->last_pts = GST_CLOCK_TIME_NONE;
if (priv->current_frame_events) {
g_list_free_full (priv->current_frame_events,
(GDestroyNotify) gst_event_unref);
priv->current_frame_events = NULL;
}
}
static gboolean
gst_codec_timestamper_start (GstCodecTimestamper * self)
{
GstCodecTimestamperClass *klass = GST_CODEC_TIMESTAMPER_GET_CLASS (self);
gst_codec_timestamper_reset (self);
if (klass->start)
return klass->start (self);
return TRUE;
}
static gboolean
gst_codec_timestamper_stop (GstCodecTimestamper * self)
{
GstCodecTimestamperClass *klass = GST_CODEC_TIMESTAMPER_GET_CLASS (self);
gst_codec_timestamper_reset (self);
if (klass->stop)
return klass->stop (self);
return TRUE;
}
static GstStateChangeReturn
gst_codec_timestamper_change_state (GstElement * element,
GstStateChange transition)
{
GstCodecTimestamper *self = GST_CODEC_TIMESTAMPER (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_codec_timestamper_start (self);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_codec_timestamper_stop (self);
break;
default:
break;
}
return ret;
}
void
gst_codec_timestamper_set_window_size (GstCodecTimestamper * timestamper,
guint window_size)
{
GstCodecTimestamperPrivate *priv = timestamper->priv;
gboolean updated = FALSE;
GstClockTime latency = 0;
g_rec_mutex_lock (&priv->lock);
priv->dts_offset = 0;
priv->window_size = 0;
if (window_size) {
priv->dts_offset = gst_util_uint64_scale_int (window_size * GST_SECOND,
priv->fps_d, priv->fps_n);
/* Add margin to be robust against PTS errors and in order for boundary
* frames' PTS can be referenced */
window_size += 2;
latency = gst_util_uint64_scale_int (window_size * GST_SECOND,
priv->fps_d, priv->fps_n);
priv->window_size = window_size;
}
if (priv->latency != latency) {
updated = TRUE;
priv->latency = latency;
}
GST_DEBUG_OBJECT (timestamper,
"New window size %d, latency %" GST_TIME_FORMAT ", framerate %d/%d",
priv->window_size, GST_TIME_ARGS (latency), priv->fps_n, priv->fps_d);
g_rec_mutex_unlock (&priv->lock);
if (updated) {
gst_codec_timestamper_drain (timestamper);
gst_element_post_message (GST_ELEMENT_CAST (timestamper),
gst_message_new_latency (GST_OBJECT_CAST (timestamper)));
}
}