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Seeking support in WavPack

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Originally committed as revision 7750 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2007-01-28 17:23:28 +00:00
parent 1658bc4f96
commit 49561f992e
1 changed files with 42 additions and 3 deletions
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45
libavformat/wv.c
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@ -50,8 +50,10 @@ static const int wv_rates[16] = {
typedef struct{
uint32_t blksize, flags;
int rate, chan, bpp;
uint32_t samples, soff;
int block_parsed;
uint8_t extra[WV_EXTRA_SIZE];
int64_t pos;
}WVContext;
static int wv_probe(AVProbeData *p)
@ -73,6 +75,7 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
int size;
int rate, bpp, chan;
wc->pos = url_ftell(pb);
tag = get_le32(pb);
if (tag != MKTAG('w', 'v', 'p', 'k'))
return -1;
@ -89,8 +92,8 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
}
get_byte(pb); // track no
get_byte(pb); // track sub index
get_le32(pb); // total samples in file
get_le32(pb); // offset in samples of current block
wc->samples = get_le32(pb); // total samples in file
wc->soff = get_le32(pb); // offset in samples of current block
get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
wc->flags = AV_RL32(wc->extra + 4);
//parse flags
@ -155,6 +158,8 @@ static int wv_read_header(AVFormatContext *s,
st->codec->sample_rate = wc->rate;
st->codec->bits_per_sample = wc->bpp;
av_set_pts_info(st, 64, 1, wc->rate);
s->start_time = 0;
s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
return 0;
}
@ -182,7 +187,8 @@ static int wv_read_packet(AVFormatContext *s,
pkt->stream_index = 0;
wc->block_parsed = 1;
pkt->size = ret + WV_EXTRA_SIZE;
pkt->pts = wc->soff;
av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
return 0;
}
@ -191,6 +197,38 @@ static int wv_read_close(AVFormatContext *s)
return 0;
}
static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
WVContext *wc = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
int ret;
int index = av_index_search_timestamp(st, timestamp, flags);
int64_t pos, pts;
/* if found, seek there */
if (index >= 0){
wc->block_parsed = 1;
url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
return 0;
}
/* if timestamp is out of bounds, return error */
if(timestamp < 0 || timestamp >= s->duration)
return -1;
pos = url_ftell(&s->pb);
do{
ret = av_read_frame(s, pkt);
if (ret < 0){
url_fseek(&s->pb, pos, SEEK_SET);
return -1;
}
pts = pkt->pts;
av_free_packet(pkt);
}while(pts < timestamp);
return 0;
}
AVInputFormat wv_demuxer = {
"wv",
"WavPack",
@ -199,4 +237,5 @@ AVInputFormat wv_demuxer = {
wv_read_header,
wv_read_packet,
wv_read_close,
wv_read_seek,
};