mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-02-23 06:26:23 +00:00
Code Issues 1 Projects Releases Wiki Activity

qtdemux: Put framerate into the closedcaption caps if it can be calculated from the stream

Browse source 
Using the same calculation used for video streams.
This commit is contained in:
Sebastian Dröge 2018-12-05 19:37:13 +02:00 committed by Sebastian Dröge
parent 830e7dc14b
commit c50be8f146
1 changed files with 81 additions and 57 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

138
gst/isomp4/qtdemux.c
View file

@ -8329,67 +8329,75 @@ gst_qtdemux_configure_protected_caps (GstQTDemux * qtdemux,
return TRUE;
}
static gboolean
gst_qtdemux_guess_framerate (GstQTDemux * qtdemux, QtDemuxStream * stream)
{
/* fps is calculated base on the duration of the average framerate since
* qt does not have a fixed framerate. */
gboolean fps_available = TRUE;
guint32 first_duration = 0;
if (stream->n_samples > 0)
first_duration = stream->samples[0].duration;
if ((stream->n_samples == 1 && first_duration == 0)
|| (qtdemux->fragmented && stream->n_samples_moof == 1)) {
/* still frame */
CUR_STREAM (stream)->fps_n = 0;
CUR_STREAM (stream)->fps_d = 1;
} else {
if (stream->duration == 0 || stream->n_samples < 2) {
CUR_STREAM (stream)->fps_n = stream->timescale;
CUR_STREAM (stream)->fps_d = 1;
fps_available = FALSE;
} else {
GstClockTime avg_duration;
guint64 duration;
guint32 n_samples;
/* duration and n_samples can be updated for fragmented format
* so, framerate of fragmented format is calculated using data in a moof */
if (qtdemux->fragmented && stream->n_samples_moof > 0
&& stream->duration_moof > 0) {
n_samples = stream->n_samples_moof;
duration = stream->duration_moof;
} else {
n_samples = stream->n_samples;
duration = stream->duration;
}
/* Calculate a framerate, ignoring the first sample which is sometimes truncated */
/* stream->duration is guint64, timescale, n_samples are guint32 */
avg_duration =
gst_util_uint64_scale_round (duration -
first_duration, GST_SECOND,
(guint64) (stream->timescale) * (n_samples - 1));
GST_LOG_OBJECT (qtdemux,
"Calculating avg sample duration based on stream (or moof) duration %"
G_GUINT64_FORMAT
" minus first sample %u, leaving %d samples gives %"
GST_TIME_FORMAT, duration, first_duration,
n_samples - 1, GST_TIME_ARGS (avg_duration));
gst_video_guess_framerate (avg_duration, &CUR_STREAM (stream)->fps_n,
&CUR_STREAM (stream)->fps_d);
GST_DEBUG_OBJECT (qtdemux,
"Calculating framerate, timescale %u gave fps_n %d fps_d %d",
stream->timescale, CUR_STREAM (stream)->fps_n,
CUR_STREAM (stream)->fps_d);
}
}
return fps_available;
}
static gboolean
gst_qtdemux_configure_stream (GstQTDemux * qtdemux, QtDemuxStream * stream)
{
if (stream->subtype == FOURCC_vide) {
/* fps is calculated base on the duration of the average framerate since
* qt does not have a fixed framerate. */
gboolean fps_available = TRUE;
guint32 first_duration = 0;
if (stream->n_samples > 0)
first_duration = stream->samples[0].duration;
if ((stream->n_samples == 1 && first_duration == 0)
|| (qtdemux->fragmented && stream->n_samples_moof == 1)) {
/* still frame */
CUR_STREAM (stream)->fps_n = 0;
CUR_STREAM (stream)->fps_d = 1;
} else {
if (stream->duration == 0 || stream->n_samples < 2) {
CUR_STREAM (stream)->fps_n = stream->timescale;
CUR_STREAM (stream)->fps_d = 1;
fps_available = FALSE;
} else {
GstClockTime avg_duration;
guint64 duration;
guint32 n_samples;
/* duration and n_samples can be updated for fragmented format
* so, framerate of fragmented format is calculated using data in a moof */
if (qtdemux->fragmented && stream->n_samples_moof > 0
&& stream->duration_moof > 0) {
n_samples = stream->n_samples_moof;
duration = stream->duration_moof;
} else {
n_samples = stream->n_samples;
duration = stream->duration;
}
/* Calculate a framerate, ignoring the first sample which is sometimes truncated */
/* stream->duration is guint64, timescale, n_samples are guint32 */
avg_duration =
gst_util_uint64_scale_round (duration -
first_duration, GST_SECOND,
(guint64) (stream->timescale) * (n_samples - 1));
GST_LOG_OBJECT (qtdemux,
"Calculating avg sample duration based on stream (or moof) duration %"
G_GUINT64_FORMAT
" minus first sample %u, leaving %d samples gives %"
GST_TIME_FORMAT, duration, first_duration,
n_samples - 1, GST_TIME_ARGS (avg_duration));
gst_video_guess_framerate (avg_duration, &CUR_STREAM (stream)->fps_n,
&CUR_STREAM (stream)->fps_d);
GST_DEBUG_OBJECT (qtdemux,
"Calculating framerate, timescale %u gave fps_n %d fps_d %d",
stream->timescale, CUR_STREAM (stream)->fps_n,
CUR_STREAM (stream)->fps_d);
}
}
gboolean fps_available = gst_qtdemux_guess_framerate (qtdemux, stream);
if (CUR_STREAM (stream)->caps) {
CUR_STREAM (stream)->caps =
@ -8509,6 +8517,22 @@ gst_qtdemux_configure_stream (GstQTDemux * qtdemux, QtDemuxStream * stream)
}
}
else if (stream->subtype == FOURCC_clcp) {
gboolean fps_available = gst_qtdemux_guess_framerate (qtdemux, stream);
if (CUR_STREAM (stream)->caps) {
CUR_STREAM (stream)->caps =
gst_caps_make_writable (CUR_STREAM (stream)->caps);
/* set framerate if calculated framerate is reliable */
if (fps_available) {
gst_caps_set_simple (CUR_STREAM (stream)->caps,
"framerate", GST_TYPE_FRACTION, CUR_STREAM (stream)->fps_n,
CUR_STREAM (stream)->fps_d, NULL);
}
}
}
if (stream->pad) {
GstCaps *prev_caps = NULL;