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Code Issues Releases Activity

fftools/ffmpeg: stop accessing av_stream_get_parser() from the main thread

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It races with the demuxing thread. Instead, send the information along
with the demuxed packets.

Ideally, the code should stop using the stream-internal parsing
completely, but that requires considerably more effort.

Fixes races, e.g. in:
- fate-h264-brokensps-2580
- fate-h264-extradata-reload
- fate-iv8-demux
- fate-m4v-cfr
- fate-m4v
This commit is contained in:
Anton Khirnov 2022-08-18 11:13:08 +02:00
parent 47b85c5a76
commit 8d26a21bf6
3 changed files with 26 additions and 4 deletions
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8
fftools/ffmpeg.c
View File

@ -2452,7 +2452,9 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
if (pkt && pkt->duration) {
duration_dts = av_rescale_q(pkt->duration, ist->st->time_base, AV_TIME_BASE_Q);
} else if(ist->dec_ctx->framerate.num != 0 && ist->dec_ctx->framerate.den != 0) {
int ticks= av_stream_get_parser(ist->st) ? av_stream_get_parser(ist->st)->repeat_pict+1 : ist->dec_ctx->ticks_per_frame;
int ticks = ist->last_pkt_repeat_pict >= 0 ?
ist->last_pkt_repeat_pict + 1 :
ist->dec_ctx->ticks_per_frame;
duration_dts = ((int64_t)AV_TIME_BASE *
ist->dec_ctx->framerate.den * ticks) /
ist->dec_ctx->framerate.num / ist->dec_ctx->ticks_per_frame;
@ -2555,7 +2557,9 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
} else if (pkt->duration) {
ist->next_dts += av_rescale_q(pkt->duration, ist->st->time_base, AV_TIME_BASE_Q);
} else if(ist->dec_ctx->framerate.num != 0) {
int ticks= av_stream_get_parser(ist->st) ? av_stream_get_parser(ist->st)->repeat_pict + 1 : ist->dec_ctx->ticks_per_frame;
int ticks = ist->last_pkt_repeat_pict >= 0 ?
ist->last_pkt_repeat_pict + 1 :
ist->dec_ctx->ticks_per_frame;
ist->next_dts += ((int64_t)AV_TIME_BASE *
ist->dec_ctx->framerate.den * ticks) /
ist->dec_ctx->framerate.num / ist->dec_ctx->ticks_per_frame;

6
fftools/ffmpeg.h
View File

@ -348,6 +348,12 @@ typedef struct InputStream {
int64_t pts; ///< current pts of the decoded frame (in AV_TIME_BASE units)
int wrap_correction_done;
// the value of AVCodecParserContext.repeat_pict from the AVStream parser
// for the last packet returned from ifile_get_packet()
// -1 if unknown
// FIXME: this is a hack, the avstream parser should not be used
int last_pkt_repeat_pict;
int64_t filter_in_rescale_delta_last;
int64_t min_pts; /* pts with the smallest value in a current stream */

16
fftools/ffmpeg_demux.c
View File

@ -32,6 +32,9 @@
typedef struct DemuxMsg {
AVPacket *pkt;
int looping;
// repeat_pict from the demuxer-internal parser
int repeat_pict;
} DemuxMsg;
static void report_new_stream(InputFile *file, const AVPacket *pkt)
@ -114,7 +117,7 @@ static int seek_to_start(InputFile *ifile)
return ret;
}
static void ts_fixup(InputFile *ifile, AVPacket *pkt)
static void ts_fixup(InputFile *ifile, AVPacket *pkt, int *repeat_pict)
{
InputStream *ist = input_streams[ifile->ist_index + pkt->stream_index];
const int64_t start_time = ifile->ctx->start_time;
@ -167,6 +170,11 @@ static void ts_fixup(InputFile *ifile, AVPacket *pkt)
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += duration;
*repeat_pict = -1;
if (ist->st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
av_stream_get_parser(ist->st))
*repeat_pict = av_stream_get_parser(ist->st)->repeat_pict;
}
static void *input_thread(void *arg)
@ -231,7 +239,7 @@ static void *input_thread(void *arg)
}
}
ts_fixup(f, pkt);
ts_fixup(f, pkt, &msg.repeat_pict);
msg.pkt = av_packet_alloc();
if (!msg.pkt) {
@ -352,6 +360,7 @@ int init_input_threads(void)
int ifile_get_packet(InputFile *f, AVPacket **pkt)
{
InputStream *ist;
DemuxMsg msg;
int ret;
@ -382,6 +391,9 @@ int ifile_get_packet(InputFile *f, AVPacket **pkt)
if (msg.looping)
return 1;
ist = input_streams[f->ist_index + msg.pkt->stream_index];
ist->last_pkt_repeat_pict = msg.repeat_pict;
*pkt = msg.pkt;
return 0;
}