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mov: fix composition timestamps on movie fragments. 

This fixes, for instance, the case that there is a track that has some samples with composition time offset and has a track run without sample-composition-time-offsets-present.
This commit is contained in:
Yusuke Nakamura 2011-04-29 23:39:29 +09:00 committed by Alex Converse
parent 869303bebd
commit 45a811b512
1 changed files with 27 additions and 13 deletions
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30
libavformat/mov.c
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@ -2001,6 +2001,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
MOVFragment *frag = &c->fragment;
AVStream *st = NULL;
MOVStreamContext *sc;
MOVStts *ctts_data;
uint64_t offset;
int64_t dts;
int data_offset = 0;
@ -2024,10 +2025,23 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
flags = avio_rb24(pb);
entries = avio_rb32(pb);
av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
if (flags & 0x001) data_offset = avio_rb32(pb);
if (flags & 0x004) first_sample_flags = avio_rb32(pb);
if (flags & 0x800) {
MOVStts *ctts_data;
/* Always assume the presence of composition time offsets.
* Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
* 1) in the initial movie, there are no samples.
* 2) in the first movie fragment, there is only one sample without composition time offset.
* 3) in the subsequent movie fragments, there are samples with composition time offset. */
if (!sc->ctts_count && sc->sample_count)
{
/* Complement ctts table if moov atom doesn't have ctts atom. */
ctts_data = av_malloc(sizeof(*sc->ctts_data));
if (!ctts_data)
return AVERROR(ENOMEM);
sc->ctts_data = ctts_data;
sc->ctts_data[sc->ctts_count].count = sc->sample_count;
sc->ctts_data[sc->ctts_count].duration = 0;
sc->ctts_count++;
}
if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
return -1;
ctts_data = av_realloc(sc->ctts_data,
@ -2035,7 +2049,9 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (!ctts_data)
return AVERROR(ENOMEM);
sc->ctts_data = ctts_data;
}
if (flags & 0x001) data_offset = avio_rb32(pb);
if (flags & 0x004) first_sample_flags = avio_rb32(pb);
dts = st->duration;
offset = frag->base_data_offset + data_offset;
distance = 0;
@ -2049,11 +2065,9 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (flags & 0x100) sample_duration = avio_rb32(pb);
if (flags & 0x200) sample_size = avio_rb32(pb);
if (flags & 0x400) sample_flags = avio_rb32(pb);
if (flags & 0x800) {
sc->ctts_data[sc->ctts_count].count = 1;
sc->ctts_data[sc->ctts_count].duration = avio_rb32(pb);
sc->ctts_data[sc->ctts_count].duration = (flags & 0x800) ? avio_rb32(pb) : 0;
sc->ctts_count++;
}
if ((keyframe = st->codec->codec_type == AVMEDIA_TYPE_AUDIO ||
(flags & 0x004 && !i && !sample_flags) || sample_flags & 0x2000000))
distance = 0;