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videodecoder: use oldest frame DTS to estimate missing outgoing PTS

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This commit is contained in:
Mark Nauwelaerts 2012-09-27 11:31:34 +02:00
parent dbc89e3ab6
commit dc2f2c9a40
1 changed files with 26 additions and 1 deletions
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27
gst-libs/gst/video/gstvideodecoder.c
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@ -350,6 +350,8 @@ struct _GstVideoDecoderPrivate
/* last outgoing ts */
GstClockTime last_timestamp_out;
/* incoming pts - dts */
GstClockTime pts_delta;
/* reverse playback */
/* collect input */
@ -1624,6 +1626,7 @@ gst_video_decoder_reset (GstVideoDecoder * decoder, gboolean full)
priv->base_timestamp = GST_CLOCK_TIME_NONE;
priv->last_timestamp_out = GST_CLOCK_TIME_NONE;
priv->pts_delta = GST_CLOCK_TIME_NONE;
priv->input_offset = 0;
priv->frame_offset = 0;
@ -2144,6 +2147,21 @@ gst_video_decoder_prepare_finish_frame (GstVideoDecoder *
GST_TIME_ARGS (frame->duration));
}
if (frame->pts == GST_CLOCK_TIME_NONE &&
GST_CLOCK_TIME_IS_VALID (priv->pts_delta) && priv->frames) {
GstVideoCodecFrame *oframe = priv->frames->data;
/* valid delta, so we have some reasonable DTS input,
* then outgoing PTS = smallest DTS = DTS of oldest frame */
if (GST_CLOCK_TIME_IS_VALID (oframe->dts)) {
frame->pts = oframe->dts + priv->pts_delta;
GST_LOG_OBJECT (decoder,
"Guessing timestamp %" GST_TIME_FORMAT
" from DTS %" GST_TIME_FORMAT " for frame...",
GST_TIME_ARGS (frame->pts), GST_TIME_ARGS (oframe->dts));
}
}
if (frame->pts == GST_CLOCK_TIME_NONE) {
/* Last ditch timestamp guess: Just add the duration to the previous
* frame */
@ -2553,8 +2571,15 @@ gst_video_decoder_decode_frame (GstVideoDecoder * decoder,
/* For keyframes, PTS = DTS */
if (GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame)) {
if (!GST_CLOCK_TIME_IS_VALID (frame->pts))
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));
}
}
GST_LOG_OBJECT (decoder, "PTS %" GST_TIME_FORMAT ", DTS %" GST_TIME_FORMAT,