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ffmpgdec: work around parser timestamp bug

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Sometimes the parser loses track of timestamps and starts to reuse old
timestamp. Feed it some dummy data and clear some context variables to work
around the problem.
This commit is contained in:
Wim Taymans 2010-12-21 12:11:32 +01:00
parent 3177801827
commit 22d44c87b1
1 changed files with 29 additions and 3 deletions
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32
ext/ffmpeg/gstffmpegdec.c
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@ -2286,6 +2286,22 @@ gst_ffmpegdec_drain (GstFFMpegDec * ffmpegdec)
static void
gst_ffmpegdec_flush_pcache (GstFFMpegDec * ffmpegdec)
{
if (ffmpegdec->pctx) {
gint res, size, bsize;
guint8 *data;
guint8 bdata[FF_INPUT_BUFFER_PADDING_SIZE];
bsize = FF_INPUT_BUFFER_PADDING_SIZE;
memset (bdata, 0, bsize);
/* parse some dummy data to work around some ffmpeg weirdness where it keeps
* the previous pts around */
res = av_parser_parse (ffmpegdec->pctx, ffmpegdec->context,
&data, &size, bdata, bsize, -1, -1);
ffmpegdec->pctx->pts = -1;
ffmpegdec->pctx->dts = -1;
}
if (ffmpegdec->pcache) {
gst_buffer_unref (ffmpegdec->pcache);
ffmpegdec->pcache = NULL;
@ -2535,7 +2551,8 @@ gst_ffmpegdec_chain (GstPad * pad, GstBuffer * inbuf)
GST_LOG_OBJECT (ffmpegdec,
"Calling av_parser_parse with offset %" G_GINT64_FORMAT ", ts:%"
GST_TIME_FORMAT, in_offset, GST_TIME_ARGS (in_timestamp));
GST_TIME_FORMAT " size %d", in_offset, GST_TIME_ARGS (in_timestamp),
bsize);
/* feed the parser. We pass the timestamp info so that we can recover all
* info again later */
@ -2543,10 +2560,19 @@ gst_ffmpegdec_chain (GstPad * pad, GstBuffer * inbuf)
&data, &size, bdata, bsize, in_info->idx, in_info->idx);
GST_LOG_OBJECT (ffmpegdec,
"parser returned res %d and size %d", res, size);
"parser returned res %d and size %d, id %d", res, size,
ffmpegdec->pctx->pts);
/* store pts for decoding */
dec_info = gst_ts_info_get (ffmpegdec, ffmpegdec->pctx->pts);
if (ffmpegdec->pctx->pts != -1)
dec_info = gst_ts_info_get (ffmpegdec, ffmpegdec->pctx->pts);
else {
/* ffmpeg sometimes loses track after a flush, help it by feeding a
* valid start time */
ffmpegdec->pctx->pts = in_info->idx;
ffmpegdec->pctx->dts = in_info->idx;
dec_info = in_info;
}
GST_LOG_OBJECT (ffmpegdec, "consuming %d bytes. id %d", size,
dec_info->idx);