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dvdemux: Fix timestamping in reverse playback mode

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This is only supported right now if after a demuxer that supports reverse
playback, e.g. with DV container inside AVI container.
This commit is contained in:
Sebastian Dröge 2016-09-06 14:25:42 +03:00
parent f74d2693b6
commit 720c3525de
1 changed files with 26 additions and 6 deletions
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32
ext/dv/gstdvdemux.c
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@ -1533,10 +1533,18 @@ gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
GST_SMPTE_TIME_CODE_SYSTEM_25 : GST_SMPTE_TIME_CODE_SYSTEM_30,
&frame_number, &timecode);
next_ts = gst_util_uint64_scale_int (
(dvdemux->frame_offset + 1) * GST_SECOND,
dvdemux->framerate_denominator, dvdemux->framerate_numerator);
duration = next_ts - dvdemux->time_segment.position;
if (dvdemux->time_segment.rate < 0) {
next_ts = gst_util_uint64_scale_int (
(dvdemux->frame_offset >
0 ? dvdemux->frame_offset - 1 : 0) * GST_SECOND,
dvdemux->framerate_denominator, dvdemux->framerate_numerator);
duration = dvdemux->time_segment.position - next_ts;
} else {
next_ts = gst_util_uint64_scale_int (
(dvdemux->frame_offset + 1) * GST_SECOND,
dvdemux->framerate_denominator, dvdemux->framerate_numerator);
duration = next_ts - dvdemux->time_segment.position;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
dv_parse_packs (dvdemux->decoder, map.data);
@ -1569,10 +1577,22 @@ gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
dvdemux->discont = FALSE;
dvdemux->time_segment.position = next_ts;
dvdemux->frame_offset++;
if (dvdemux->time_segment.rate < 0) {
if (dvdemux->frame_offset > 0)
dvdemux->frame_offset--;
else
GST_WARNING_OBJECT (dvdemux,
"Got before frame offset 0 in reverse playback");
} else {
dvdemux->frame_offset++;
}
/* check for the end of the segment */
if (dvdemux->time_segment.stop != -1 && next_ts > dvdemux->time_segment.stop)
if ((dvdemux->time_segment.rate > 0 && dvdemux->time_segment.stop != -1
&& next_ts > dvdemux->time_segment.stop)
|| (dvdemux->time_segment.rate < 0
&& dvdemux->time_segment.start > next_ts))
ret = GST_FLOW_EOS;
else
ret = GST_FLOW_OK;