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videodecoder: Don't blindly assign DTS to PTS

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DTS and PTS usually have a non-zero offset between them in MPEG-TS,
so assigning DTS to PTS is almost always wrong.  The other, newer
timestamp recovery code does it correctly if we leave it as invalid.
This commit is contained in:
David Schleef 2013-02-08 15:31:28 -08:00
parent ceb6585d26
commit 31312d586e
1 changed files with 10 additions and 11 deletions
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21
gst-libs/gst/video/gstvideodecoder.c
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@ -2633,20 +2633,19 @@ gst_video_decoder_decode_frame (GstVideoDecoder * decoder,
frame->dts = GST_BUFFER_DTS (frame->input_buffer);
frame->duration = GST_BUFFER_DURATION (frame->input_buffer);
/* For keyframes, PTS = DTS */
/* For keyframes, PTS = DTS + constant_offset, usually 0 to 3 frame
* durations. */
/* FIXME upstream can be quite wrong about the keyframe aspect,
* so we could be going off here as well,
* maybe let subclass decide if it really is/was a keyframe */
if (GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame)) {
if (!GST_CLOCK_TIME_IS_VALID (frame->pts)) {
frame->pts = frame->dts;
} else if (GST_CLOCK_TIME_IS_VALID (frame->dts)) {
/* just in case they are not equal as might ideally be,
* e.g. quicktime has a (positive) delta approach */
priv->pts_delta = frame->pts - frame->dts;
GST_DEBUG_OBJECT (decoder, "PTS delta %d ms",
(gint) (priv->pts_delta / GST_MSECOND));
}
if (GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame) &&
GST_CLOCK_TIME_IS_VALID (frame->pts)
&& GST_CLOCK_TIME_IS_VALID (frame->dts)) {
/* just in case they are not equal as might ideally be,
* e.g. quicktime has a (positive) delta approach */
priv->pts_delta = frame->pts - frame->dts;
GST_DEBUG_OBJECT (decoder, "PTS delta %d ms",
(gint) (priv->pts_delta / GST_MSECOND));
}
frame->abidata.ABI.ts = frame->dts;