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avformat/demux: allow demuxers to output more than one packet per read_packet() call

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2024-02-15 19:10:53 -03:00
parent 37702e2066
commit b140b8332c
2 changed files with 70 additions and 21 deletions
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89
libavformat/demux.c
View File

@ -540,6 +540,73 @@ static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_in
return 1;
}
static void update_timestamps(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
FFStream *const sti = ffstream(st);
av_assert0(pkt->stream_index < (unsigned)s->nb_streams &&
"Invalid stream index.\n");
if (update_wrap_reference(s, st, pkt->stream_index, pkt) && sti->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET) {
// correct first time stamps to negative values
if (!is_relative(sti->first_dts))
sti->first_dts = wrap_timestamp(st, sti->first_dts);
if (!is_relative(st->start_time))
st->start_time = wrap_timestamp(st, st->start_time);
if (!is_relative(sti->cur_dts))
sti->cur_dts = wrap_timestamp(st, sti->cur_dts);
}
pkt->dts = wrap_timestamp(st, pkt->dts);
pkt->pts = wrap_timestamp(st, pkt->pts);
force_codec_ids(s, st);
/* TODO: audio: time filter; video: frame reordering (pts != dts) */
if (s->use_wallclock_as_timestamps)
pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
}
int ff_buffer_packet(AVFormatContext *s, AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
AVStream *st = s->streams[pkt->stream_index];
FFStream *sti = ffstream(st);
int err;
if (pkt->flags & AV_PKT_FLAG_CORRUPT) {
av_log(s, AV_LOG_WARNING,
"Packet corrupt (stream = %d, dts = %s)",
pkt->stream_index, av_ts2str(pkt->dts));
if (s->flags & AVFMT_FLAG_DISCARD_CORRUPT) {
av_log(s, AV_LOG_WARNING, ", dropping it.\n");
av_packet_unref(pkt);
return 0;
}
av_log(s, AV_LOG_WARNING, ".\n");
}
update_timestamps(s, st, pkt);
err = avpriv_packet_list_put(&si->raw_packet_buffer, pkt, NULL, 0);
if (err < 0) {
av_packet_unref(pkt);
return err;
}
pkt = &si->raw_packet_buffer.tail->pkt;
si->raw_packet_buffer_size += pkt->size;
if (sti->request_probe <= 0)
return 0;
err = probe_codec(s, st, pkt);
if (err < 0)
return err;
return 0;
}
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
@ -613,30 +680,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
av_log(s, AV_LOG_WARNING, ".\n");
}
av_assert0(pkt->stream_index < (unsigned)s->nb_streams &&
"Invalid stream index.\n");
st = s->streams[pkt->stream_index];
sti = ffstream(st);
if (update_wrap_reference(s, st, pkt->stream_index, pkt) && sti->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET) {
// correct first time stamps to negative values
if (!is_relative(sti->first_dts))
sti->first_dts = wrap_timestamp(st, sti->first_dts);
if (!is_relative(st->start_time))
st->start_time = wrap_timestamp(st, st->start_time);
if (!is_relative(sti->cur_dts))
sti->cur_dts = wrap_timestamp(st, sti->cur_dts);
}
pkt->dts = wrap_timestamp(st, pkt->dts);
pkt->pts = wrap_timestamp(st, pkt->pts);
force_codec_ids(s, st);
/* TODO: audio: time filter; video: frame reordering (pts != dts) */
if (s->use_wallclock_as_timestamps)
pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
update_timestamps(s, st, pkt);
if (!pktl && sti->request_probe <= 0)
return 0;

2
libavformat/demux.h
View File

@ -238,4 +238,6 @@ int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int
*/
int ff_find_stream_index(const AVFormatContext *s, int id);
int ff_buffer_packet(AVFormatContext *s, AVPacket *pkt);
#endif /* AVFORMAT_DEMUX_H */