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dec: use input timestamp diff for duration estimation

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Use the diff between input timestamps to estimate the duration when no duration
is set on input buffers. Only do this when there are no reordered input
timestamps. Improves interpolation in DTS mode when no input duration is set.
This commit is contained in:
Wim Taymans 2010-12-12 10:54:09 +01:00 committed by Wim Taymans
parent da5245865b
commit 957c728b3d
1 changed files with 14 additions and 6 deletions
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20
ext/ffmpeg/gstffmpegdec.c
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@ -96,7 +96,7 @@ struct _GstFFMpegDec
gboolean has_b_frames;
gboolean reordered_in;
GstClockTime last_in;
GstClockTime next_in;
GstClockTime last_diff;
gboolean reordered_out;
GstClockTime last_out;
GstClockTime next_out;
@ -498,7 +498,7 @@ static void
gst_ffmpegdec_reset_ts (GstFFMpegDec * ffmpegdec)
{
ffmpegdec->last_in = GST_CLOCK_TIME_NONE;
ffmpegdec->next_in = GST_CLOCK_TIME_NONE;
ffmpegdec->last_diff = GST_CLOCK_TIME_NONE;
ffmpegdec->last_out = GST_CLOCK_TIME_NONE;
ffmpegdec->next_out = GST_CLOCK_TIME_NONE;
ffmpegdec->reordered_in = FALSE;
@ -1872,6 +1872,9 @@ gst_ffmpegdec_video_frame (GstFFMpegDec * ffmpegdec,
} else if (GST_CLOCK_TIME_IS_VALID (dec_info->duration)) {
GST_LOG_OBJECT (ffmpegdec, "using in_duration");
out_duration = dec_info->duration;
} else if (GST_CLOCK_TIME_IS_VALID (ffmpegdec->last_diff)) {
GST_LOG_OBJECT (ffmpegdec, "using last-diff");
out_duration = ffmpegdec->last_diff;
} else {
/* if we have an input framerate, use that */
if (ffmpegdec->format.video.fps_n != -1 &&
@ -2482,10 +2485,15 @@ gst_ffmpegdec_chain (GstPad * pad, GstBuffer * inbuf)
if (in_timestamp != -1) {
/* check for increasing timestamps if they are jumping backwards, we
* probably are dealing with PTS as timestamps */
if (!ffmpegdec->reordered_in && ffmpegdec->last_in != -1
&& in_timestamp < ffmpegdec->last_in) {
GST_LOG_OBJECT (ffmpegdec, "detected reordered input timestamps");
ffmpegdec->reordered_in = TRUE;
if (!ffmpegdec->reordered_in && ffmpegdec->last_in != -1) {
if (in_timestamp < ffmpegdec->last_in) {
GST_LOG_OBJECT (ffmpegdec, "detected reordered input timestamps");
ffmpegdec->reordered_in = TRUE;
ffmpegdec->last_diff = GST_CLOCK_TIME_NONE;
} else if (in_timestamp > ffmpegdec->last_in) {
/* keep track of timestamp diff to estimate duration */
ffmpegdec->last_diff = in_timestamp - ffmpegdec->last_in;
}
}
ffmpegdec->last_in = in_timestamp;
}