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ogg: calculate the start position once all the headers are parsed

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The fisbone packets can be muxed in any order as long the last one
comes before the first data packet.
This commit is contained in:
Luca Barbato 2012-09-20 01:07:09 +02:00
parent 7751e4693d
commit d1f05dd183
3 changed files with 16 additions and 4 deletions
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4
libavformat/oggdec.c
View File

@ -169,6 +169,7 @@ static int ogg_new_stream(AVFormatContext *s, uint32_t serial, int new_avstream)
os->bufsize = DECODER_BUFFER_SIZE;
os->buf = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
os->header = -1;
os->start_granule = OGG_NOGRANULE_VALUE;
if (new_avstream) {
st = avformat_new_stream(s, NULL);
@ -463,6 +464,9 @@ static int ogg_get_headers(AVFormatContext *s)
"Headers mismatch for stream %d\n", i);
return AVERROR_INVALIDDATA;
}
if (os->start_granule != OGG_NOGRANULE_VALUE)
os->lastpts = s->streams[i]->start_time =
ogg_gptopts(s, i, os->start_granule, NULL);
}
av_dlog(s, "found headers\n");

3
libavformat/oggdec.h
View File

@ -67,6 +67,7 @@ struct ogg_stream {
unsigned int pduration;
uint32_t serial;
uint64_t granule;
uint64_t start_granule;
int64_t lastpts;
int64_t lastdts;
int64_t sync_pos; ///< file offset of the first page needed to reconstruct the current packet
@ -103,6 +104,8 @@ struct ogg {
#define OGG_FLAG_BOS 2
#define OGG_FLAG_EOS 4
#define OGG_NOGRANULE_VALUE -1ull
extern const struct ogg_codec ff_celt_codec;
extern const struct ogg_codec ff_dirac_codec;
extern const struct ogg_codec ff_flac_codec;

13
libavformat/oggparseskeleton.c
View File

@ -30,7 +30,8 @@ static int skeleton_header(AVFormatContext *s, int idx)
AVStream *st = s->streams[idx];
uint8_t *buf = os->buf + os->pstart;
int version_major, version_minor;
int64_t start_num, start_den, start_granule;
int64_t start_num, start_den;
uint64_t start_granule;
int target_idx, start_time;
strcpy(st->codec->codec_name, "skeleton");
@ -73,9 +74,13 @@ static int skeleton_header(AVFormatContext *s, int idx)
target_idx = ogg_find_stream(ogg, AV_RL32(buf+12));
start_granule = AV_RL64(buf+36);
if (target_idx >= 0 && start_granule != -1) {
ogg->streams[target_idx].lastpts =
s->streams[target_idx]->start_time = ogg_gptopts(s, target_idx, start_granule, NULL);
if (os->start_granule != OGG_NOGRANULE_VALUE) {
av_log_missing_feature(s, "multiple fisbone for the "
"same stream\n", 0);
return 1;
}
if (target_idx >= 0 && start_granule != OGG_NOGRANULE_VALUE) {
os->start_granule = start_granule;
}
}