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movdec: Adjust keyframe flagging in fragmented files

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For video, mark the first sample in a trun which doesn't have the
sample-is-non-sync-sample flag set as a keyframe.

In particular, the "sample does not depend on other samples" flag
isn't enough to make it a keyframe, since later frames still can
reference frames prior to that one (the flag only says that that
particular frame doesn't depend on other frames).

This fixes bug 215.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-01-31 12:45:02 +02:00
parent 3ab9a2a557
commit a5c50913a8
1 changed files with 9 additions and 4 deletions
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13
libavformat/mov.c
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@ -2218,7 +2218,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
int64_t dts;
int data_offset = 0;
unsigned entries, first_sample_flags = frag->flags;
int flags, distance, i;
int flags, distance, i, found_keyframe = 0;
for (i = 0; i < c->fc->nb_streams; i++) {
if (c->fc->streams[i]->id == frag->track_id) {
@ -2272,7 +2272,7 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
unsigned sample_size = frag->size;
int sample_flags = i ? frag->flags : first_sample_flags;
unsigned sample_duration = frag->duration;
int keyframe;
int keyframe = 0;
if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);
if (flags & MOV_TRUN_SAMPLE_SIZE) sample_size = avio_rb32(pb);
@ -2281,8 +2281,13 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?
avio_rb32(pb) : 0;
sc->ctts_count++;
if ((keyframe = st->codec->codec_type == AVMEDIA_TYPE_AUDIO ||
(flags & MOV_TRUN_FIRST_SAMPLE_FLAGS && !i && !(sample_flags & ~MOV_FRAG_SAMPLE_FLAG_DEGRADATION_PRIORITY_MASK)) || sample_flags & MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO))
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
keyframe = 1;
else if (!found_keyframe)
keyframe = found_keyframe =
!(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |
MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
if (keyframe)
distance = 0;
av_add_index_entry(st, offset, dts, sample_size, distance,
keyframe ? AVINDEX_KEYFRAME : 0);