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lavf/mov: improve tref/chap chapter handling

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3 parts:
- Supports multiple chapter streams
- Exports regular text chapter streams as opaque data. This prevents consumers
  from showing chapters as if they were regular subtitle streams.
- Exports video chapter streams as thumbnails, and provides the first one as
  an attached_pic.
This commit is contained in:
Rodger Combs 2016-01-07 17:14:08 -06:00
parent 73ead477dd
commit 697400eac0
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GPG Key ID: E3E54DCDCD3CB843
2 changed files with 49 additions and 8 deletions
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3
libavformat/isom.h
View File

@ -210,7 +210,8 @@ typedef struct MOVContext {
unsigned trex_count;
int itunes_metadata; ///< metadata are itunes style
int handbrake_version;
int chapter_track;
int *chapter_tracks;
unsigned int nb_chapter_tracks;
int use_absolute_path;
int ignore_editlist;
int ignore_chapters;

54
libavformat/mov.c
View File

@ -3992,7 +3992,20 @@ static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
c->chapter_track = avio_rb32(pb);
unsigned i, num;
void *new_tracks;
num = atom.size / 4;
if (!(new_tracks = av_malloc_array(num, sizeof(int))))
return AVERROR(ENOMEM);
av_free(c->chapter_tracks);
c->chapter_tracks = new_tracks;
c->nb_chapter_tracks = num;
for (i = 0; i < num && !pb->eof_reached; i++)
c->chapter_tracks[i] = avio_rb32(pb);
return 0;
}
@ -5055,25 +5068,50 @@ static int mov_probe(AVProbeData *p)
static void mov_read_chapters(AVFormatContext *s)
{
MOVContext *mov = s->priv_data;
AVStream *st = NULL;
AVStream *st;
MOVStreamContext *sc;
int64_t cur_pos;
int i;
int i, j;
int chapter_track;
for (j = 0; j < mov->nb_chapter_tracks; j++) {
chapter_track = mov->chapter_tracks[j];
st = NULL;
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->id == mov->chapter_track) {
if (s->streams[i]->id == chapter_track) {
st = s->streams[i];
break;
}
if (!st) {
av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
return;
continue;
}
st->discard = AVDISCARD_ALL;
sc = st->priv_data;
cur_pos = avio_tell(sc->pb);
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
st->disposition |= AV_DISPOSITION_ATTACHED_PIC | AV_DISPOSITION_TIMED_THUMBNAILS;
if (st->nb_index_entries) {
// Retrieve the first frame, if possible
AVPacket pkt;
AVIndexEntry *sample = &st->index_entries[0];
if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
av_log(s, AV_LOG_ERROR, "Failed to retrieve first frame\n");
goto finish;
}
if (av_get_packet(sc->pb, &pkt, sample->size) < 0)
goto finish;
st->attached_pic = pkt;
st->attached_pic.stream_index = st->index;
st->attached_pic.flags |= AV_PKT_FLAG_KEY;
}
} else {
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = AV_CODEC_ID_BIN_DATA;
st->discard = AVDISCARD_ALL;
for (i = 0; i < st->nb_index_entries; i++) {
AVIndexEntry *sample = &st->index_entries[i];
int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
@ -5122,8 +5160,10 @@ static void mov_read_chapters(AVFormatContext *s)
avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
av_freep(&title);
}
}
finish:
avio_seek(sc->pb, cur_pos, SEEK_SET);
}
}
static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,
@ -5446,7 +5486,7 @@ static int mov_read_header(AVFormatContext *s)
av_log(mov->fc, AV_LOG_TRACE, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
if (pb->seekable) {
if (mov->chapter_track > 0 && !mov->ignore_chapters)
if (mov->nb_chapter_tracks > 0 && !mov->ignore_chapters)
mov_read_chapters(s);
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->codecpar->codec_tag == AV_RL32("tmcd")) {