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Codec frame delay fix and trailing zero-length frame fix

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Takes codec frame delay into account (roughly the same way it does for timestamps for reordered frames) to produce frames with correct offsets.
A special hack to allow trailing frame with timestamp=segment.stop to be displayed.

Fixes bug #578278.
This commit is contained in:
Руслан Ижбулатов 2009-07-18 18:53:22 +04:00 committed by Sebastian Dröge
parent 6c0205c316
commit a5f9485917
1 changed files with 46 additions and 6 deletions
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52
ext/ffmpeg/gstffmpegdec.c
View file

@ -110,6 +110,16 @@ struct _GstFFMpegDec
gboolean ts_is_dts;
gboolean has_b_frames;
/* Incremented by 1 each time ffmpeg consumes an encoded frame but does not
* give a decoded frame back. Gradually reduced to 0 while draining.
*/
gint64 delay_offset;
/* Last valid offset received from upstream. Used with delay_offset to
* calculate offsets while draining.
*/
gint64 last_offset;
/* parsing */
AVCodecParserContext *pctx;
GstBuffer *pcache;
@ -405,6 +415,8 @@ gst_ffmpegdec_init (GstFFMpegDec * ffmpegdec)
ffmpegdec->do_padding = DEFAULT_DO_PADDING;
ffmpegdec->debug_mv = DEFAULT_DEBUG_MV;
ffmpegdec->crop = DEFAULT_CROP;
ffmpegdec->delay_offset = 0;
ffmpegdec->last_offset = GST_BUFFER_OFFSET_NONE;
gst_ts_handler_init (ffmpegdec);
@ -1371,9 +1383,17 @@ clip_video_buffer (GstFFMpegDec * dec, GstBuffer * buf, GstClockTime in_ts,
res =
gst_segment_clip (&dec->segment, GST_FORMAT_TIME, in_ts, stop, &cstart,
&cstop);
if (G_UNLIKELY (!res))
if (G_UNLIKELY (!res && in_ts != dec->segment.stop))
goto beach;
/* Special case: last buffer has zero duration */
if (G_UNLIKELY (in_ts == dec->segment.stop))
{
res = TRUE;
cstart = in_ts - 1;
stop = cstop = in_ts;
}
/* we're pretty sure the duration of this buffer is not till the end of this
* segment (which _clip will assume when the stop is -1) */
if (stop == GST_CLOCK_TIME_NONE)
@ -1511,7 +1531,7 @@ flush_queued (GstFFMpegDec * ffmpegdec)
GstBuffer *buf = GST_BUFFER_CAST (ffmpegdec->queued->data);
GST_LOG_OBJECT (ffmpegdec, "pushing buffer %p, offset %"
G_GINT64_FORMAT ", timestamp %"
G_GUINT64_FORMAT ", timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, buf,
GST_BUFFER_OFFSET (buf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
@ -1599,6 +1619,9 @@ gst_ffmpegdec_video_frame (GstFFMpegDec * ffmpegdec,
gst_ts_handler_consume (ffmpegdec, len);
if (len < 0 || have_data <= 0)
ffmpegdec->delay_offset++;
/* restore previous state */
if (!decode)
ffmpegdec->context->hurry_up = hurry_up;
@ -1725,13 +1748,25 @@ gst_ffmpegdec_video_frame (GstFFMpegDec * ffmpegdec,
* Offset:
*
* 1) Use input offset if valid
* 2) Use value converted from timestamp if valid
*/
if (in_offset == GST_BUFFER_OFFSET_NONE) {
if (in_offset != GST_BUFFER_OFFSET_NONE) {
GST_LOG_OBJECT (ffmpegdec, "using in_offset %" G_GINT64_FORMAT, in_offset -
ffmpegdec->delay_offset);
out_offset = in_offset - ffmpegdec->delay_offset;
ffmpegdec->last_offset = in_offset;
} else if (ffmpegdec->last_offset != GST_BUFFER_OFFSET_NONE) {
GST_LOG_OBJECT (ffmpegdec, "using last_offset %" G_GINT64_FORMAT, ffmpegdec->last_offset -
ffmpegdec->delay_offset);
out_offset = ffmpegdec->last_offset - ffmpegdec->delay_offset;
} else if (out_timestamp >= 0) {
GstFormat out_fmt = GST_FORMAT_DEFAULT;
GST_LOG_OBJECT (ffmpegdec, "Using offset converted from timestamp");
gst_pad_query_peer_convert (ffmpegdec->sinkpad,
GST_FORMAT_TIME, out_timestamp, &out_fmt, &out_offset);
} else {
GST_LOG_OBJECT (ffmpegdec, "no valid offset found");
out_offset = GST_BUFFER_OFFSET_NONE;
} else {
GST_LOG_OBJECT (ffmpegdec, "using in_offset %" G_GINT64_FORMAT, in_offset);
out_offset = in_offset;
}
GST_BUFFER_OFFSET (*outbuf) = out_offset;
@ -2133,6 +2168,9 @@ gst_ffmpegdec_drain (GstFFMpegDec * ffmpegdec)
do {
GstFlowReturn ret;
if (ffmpegdec->delay_offset > 0)
ffmpegdec->delay_offset--;
len = gst_ffmpegdec_frame (ffmpegdec, NULL, 0, &have_data,
GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE, -1, &ret);
if (len < 0 || have_data == 0)
@ -2143,6 +2181,8 @@ gst_ffmpegdec_drain (GstFFMpegDec * ffmpegdec)
/* if we have some queued frames for reverse playback, flush them now */
flush_queued (ffmpegdec);
}
ffmpegdec->delay_offset = 0;
ffmpegdec->last_offset = GST_BUFFER_OFFSET_NONE;
}
static void