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mpegtsdemux: always try to seek for to a keyframe

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keyframe is expected to lie in the the next ~2500 ms
This commit is contained in:
Janne Grunau 2011-03-31 14:36:02 +02:00 committed by Edward Hervey
parent 9352cfc478
commit ae2e7624d6
1 changed files with 40 additions and 26 deletions
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66
gst/mpegtsdemux/tsdemux.c
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@ -545,11 +545,6 @@ gst_ts_demux_perform_auxiliary_seek (MpegTSBase * base, GstClockTime seektime,
(flags & GST_SEEK_FLAG_ACCURATE) ? "accurate" : "",
(flags & GST_SEEK_FLAG_KEY_UNIT) ? "key_unit" : "");
if ((flags & GST_SEEK_FLAG_KEY_UNIT) && !auxiliary_seek_fn) {
GST_ERROR ("key_unit seek for unkown video codec");
goto beach;
}
mpegts_packetizer_flush (base->packetizer);
while (!done && scan_offset <= length) {
@ -577,8 +572,9 @@ gst_ts_demux_perform_auxiliary_seek (MpegTSBase * base, GstClockTime seektime,
if (packet.payload_unit_start_indicator) {
guint64 pts = 0;
res = gst_ts_demux_parse_pes_header_pts (demux, &packet, &pts);
if (res == GST_FLOW_OK) {
GstFlowReturn ok =
gst_ts_demux_parse_pes_header_pts (demux, &packet, &pts);
if (ok == GST_FLOW_OK) {
GstClockTime time = calculate_gsttime (pcroffset, pts * 300);
GST_DEBUG ("packet has PTS: %" GST_TIME_FORMAT,
@ -596,7 +592,7 @@ gst_ts_demux_perform_auxiliary_seek (MpegTSBase * base, GstClockTime seektime,
state = 0xffffffff;
}
if (flags & GST_SEEK_FLAG_KEY_UNIT) {
if (auxiliary_seek_fn) {
gboolean is_keyframe = auxiliary_seek_fn (&state, &packet);
if (is_keyframe) {
found_keyframe = TRUE;
@ -606,30 +602,30 @@ gst_ts_demux_perform_auxiliary_seek (MpegTSBase * base, GstClockTime seektime,
GST_TIME_ARGS (pcroffset->gsttime),
GST_TIME_ARGS (pcroffset->pcr), pcroffset->offset);
}
} else {
/* if we don't have a payload parsing function
* every frame is a keyframe */
found_keyframe = TRUE;
}
}
switch (flags & (GST_SEEK_FLAG_ACCURATE | GST_SEEK_FLAG_KEY_UNIT)) {
case GST_SEEK_FLAG_ACCURATE | GST_SEEK_FLAG_KEY_UNIT:
done = found_accurate && found_keyframe;
*pcroffset = key_pos;
break;
case GST_SEEK_FLAG_ACCURATE:
done = found_accurate;
break;
case GST_SEEK_FLAG_KEY_UNIT:
done = found_keyframe;
break;
}
if (flags & GST_SEEK_FLAG_ACCURATE)
done = found_accurate && found_keyframe;
else
done = found_keyframe;
if (done)
*pcroffset = key_pos;
next:
mpegts_packetizer_clear_packet (base->packetizer, &packet);
}
scan_offset += 50 * MPEGTS_MAX_PACKETSIZE;
}
beach:
if (done)
res = GST_FLOW_OK;
else if (GST_FLOW_OK == res)
res = GST_FLOW_CUSTOM_ERROR_1;
beach:
mpegts_packetizer_flush (base->packetizer);
return res;
}
@ -785,10 +781,10 @@ gst_ts_demux_perform_seek (MpegTSBase * base, GstSegment * segment, guint16 pid)
/* use correct seek position for the auxiliary search */
seektime += SEEK_TIMESTAMP_OFFSET;
if (segment->flags & GST_SEEK_FLAG_ACCURATE
|| segment->flags & GST_SEEK_FLAG_KEY_UNIT) {
{
payload_parse_keyframe keyframe_seek = NULL;
MpegTSBaseProgram *program = demux->program;
guint64 avg_bitrate, length;
if (program->streams[pid]) {
switch (program->streams[pid]->stream_type) {
@ -807,11 +803,29 @@ gst_ts_demux_perform_seek (MpegTSBase * base, GstSegment * segment, guint16 pid)
}
} else
GST_WARNING ("no stream info for PID: 0x%04x", pid);
seekpcroffset.pcr = pcr_start.pcr;
seekpcroffset.offset = pcr_start.offset;
avg_bitrate =
(pcr_stop.offset -
pcr_start.offset) * 1000 * GST_MSECOND / (pcr_stop.gsttime -
pcr_start.gsttime);
seekpcroffset = pcr_start;
/* search in 2500ms for a keyframe */
length =
MIN (demux->last_pcr.offset - pcr_start.offset,
(avg_bitrate * 25) / 10);
res =
gst_ts_demux_perform_auxiliary_seek (base, seektime, &seekpcroffset,
pcr_stop.offset - pcr_start.offset, pid, segment->flags, keyframe_seek);
length, pid, segment->flags, keyframe_seek);
if (res == GST_FLOW_CUSTOM_ERROR_1) {
GST_ERROR ("no keyframe found in %" G_GUINT64_FORMAT
" bytes starting from %" G_GUINT64_FORMAT, length,
seekpcroffset.offset);
res = GST_FLOW_ERROR;
}
if (res != GST_FLOW_OK)
goto done;
}