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avformat/concatdec: add fallback for calculating file duration 

If a file does not have a known duration, this leads to the timestamps
starting over for the next file, causing non-monotonic timestamps.
To prevent this, track the duration during demuxing and use it to
determine the current file duration before opening the next file.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Justin Ruggles 2017-08-28 22:45:20 -04:00 committed by Derek Buitenhuis
parent 1291a6d0ff
commit 1a0d9b503d
1 changed files with 18 additions and 2 deletions
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20
libavformat/concatdec.c
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@ -44,6 +44,7 @@ typedef struct {
int64_t file_start_time;
int64_t file_inpoint;
int64_t duration;
int64_t next_dts;
ConcatStream *streams;
int64_t inpoint;
int64_t outpoint;
@ -149,6 +150,7 @@ static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
file->url = url;
file->start_time = AV_NOPTS_VALUE;
file->duration = AV_NOPTS_VALUE;
file->next_dts = AV_NOPTS_VALUE;
file->inpoint = AV_NOPTS_VALUE;
file->outpoint = AV_NOPTS_VALUE;
@ -509,8 +511,14 @@ static int open_next_file(AVFormatContext *avf)
ConcatContext *cat = avf->priv_data;
unsigned fileno = cat->cur_file - cat->files;
if (cat->cur_file->duration == AV_NOPTS_VALUE)
cat->cur_file->duration = cat->avf->duration - (cat->cur_file->file_inpoint - cat->cur_file->file_start_time);
if (cat->cur_file->duration == AV_NOPTS_VALUE) {
if (cat->avf->duration > 0 || cat->cur_file->next_dts == AV_NOPTS_VALUE) {
cat->cur_file->duration = cat->avf->duration;
} else {
cat->cur_file->duration = cat->cur_file->next_dts;
}
cat->cur_file->duration -= (cat->cur_file->file_inpoint - cat->cur_file->file_start_time);
}
if (++fileno >= cat->nb_files) {
cat->eof = 1;
@ -627,6 +635,14 @@ static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
memcpy(metadata, packed_metadata, metadata_len);
av_freep(&packed_metadata);
}
if (cat->cur_file->duration == AV_NOPTS_VALUE && st->cur_dts != AV_NOPTS_VALUE) {
int64_t next_dts = av_rescale_q(st->cur_dts, st->time_base, AV_TIME_BASE_Q);
if (cat->cur_file->next_dts == AV_NOPTS_VALUE || next_dts > cat->cur_file->next_dts) {
cat->cur_file->next_dts = next_dts;
}
}
return ret;
}