The parser is internal to the demuxer, so its state at any particular
point is not well-defined for the caller. Additionally, it is being
accessed from the main thread, while demuxing runs in a separate thread.
Use a separate parser owned by ffmpeg.c to retrieve the same
information.
Fixes races, e.g. in:
- fate-h264-brokensps-2580
- fate-h264-extradata-reload
- fate-iv8-demux
- fate-m4v-cfr
- fate-m4v
---
fftools/ffmpeg.c | 33 +++++++++++++++++++++++++++++++--
fftools/ffmpeg.h | 9 +++++++++
fftools/ffmpeg_opt.c | 9 +++++++++
3 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index ef7177fc33..580df0443a 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -610,6 +610,9 @@ static void ffmpeg_cleanup(int ret)
avcodec_free_context(&ist->dec_ctx);
avcodec_parameters_free(&ist->par);
+ avcodec_free_context(&ist->parser_dec);
+ av_parser_close(ist->parser);
+
av_freep(&input_streams[i]);
}
@@ -2421,6 +2424,15 @@ static int process_input_packet(InputStream *ist, const
AVPacket *pkt, int no_eo
ret = av_packet_ref(avpkt, pkt);
if (ret < 0)
return ret;
+
+ if (ist->parser) {
+ // we do not use the parsed output, only the
+ // filled codec context fields
+ uint8_t *dummy;
+ int dummy_size;
+ av_parser_parse2(ist->parser, ist->parser_dec, &dummy, &dummy_size,
+ pkt->data, pkt->size, pkt->pts, pkt->dts,
pkt->pos);
+ }
}
if (pkt && pkt->dts != AV_NOPTS_VALUE) {
@@ -2452,7 +2464,8 @@ 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->parser ? ist->parser->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 +2568,8 @@ 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->parser ? ist->parser->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;
@@ -2688,6 +2702,21 @@ static int init_input_stream(int ist_index, char *error,
int error_len)
assert_avoptions(ist->decoder_opts);
}
+ if (ist->parser) {
+ AVCodecParameters *par_tmp;
+
+ par_tmp = avcodec_parameters_alloc();
+ if (!par_tmp)
+ return AVERROR(ENOMEM);
+
+ ret = avcodec_parameters_from_context(par_tmp, ist->dec_ctx);
+ if (ret >= 0)
+ ret = avcodec_parameters_to_context(ist->parser_dec, par_tmp);
+ avcodec_parameters_free(&par_tmp);
+ if (ret < 0)
+ return ret;
+ }
+
ist->next_pts = AV_NOPTS_VALUE;
ist->next_dts = AV_NOPTS_VALUE;
diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 44cc23fa84..f67a2f1d1d 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -334,6 +334,15 @@ typedef struct InputStream {
AVFrame *decoded_frame;
AVPacket *pkt;
+ /**
+ * Parser for timestamp processing.
+ */
+ AVCodecParserContext *parser;
+ /**
+ * Codec context needed by parsing.
+ */
+ AVCodecContext *parser_dec;
+
int64_t prev_pkt_pts;
int64_t start; /* time when read started */
/* predicted dts of the next packet read for this stream or (when there are
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 30ca5cd609..a505c7b26f 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -1065,6 +1065,15 @@ static void add_input_streams(OptionsContext *o,
AVFormatContext *ic)
ist->top_field_first = -1;
MATCH_PER_STREAM_OPT(top_field_first, i, ist->top_field_first, ic,
st);
+ ist->parser = av_parser_init(ist->dec->id);
+ if (ist->parser) {
+ ist->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
+
+ ist->parser_dec = avcodec_alloc_context3(NULL);
+ if (!ist->parser_dec)
+ exit_program(1);
+ }
+
break;
case AVMEDIA_TYPE_AUDIO:
ist->guess_layout_max = INT_MAX;
--
2.35.1
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