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avformat/vpk: add seeking support

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This commit is contained in:
Paul B Mahol 2020-03-12 18:47:39 +01:00
parent e35f966853
commit f0349df7c7
1 changed files with 25 additions and 0 deletions
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25
libavformat/vpk.c
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@ -24,6 +24,7 @@
#include "internal.h"
typedef struct VPKDemuxContext {
unsigned data_start;
unsigned block_count;
unsigned current_block;
unsigned last_block_size;
@ -70,6 +71,7 @@ static int vpk_read_header(AVFormatContext *s)
if (offset < avio_tell(s->pb))
return AVERROR_INVALIDDATA;
avio_skip(s->pb, offset - avio_tell(s->pb));
vpk->data_start = offset;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
@ -85,6 +87,7 @@ static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
if (vpk->current_block == vpk->block_count) {
unsigned size = vpk->last_block_size / par->channels;
unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
uint64_t pos = avio_tell(s->pb);
ret = av_new_packet(pkt, vpk->last_block_size);
if (ret < 0)
@ -96,6 +99,7 @@ static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR(EIO);
}
}
pkt->pos = pos;
pkt->stream_index = 0;
} else if (vpk->current_block < vpk->block_count) {
ret = av_get_packet(s->pb, pkt, par->block_align);
@ -107,6 +111,26 @@ static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
return ret;
}
static int vpk_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
AVCodecParameters *par = st->codecpar;
VPKDemuxContext *vpk = s->priv_data;
int samples_per_block;
int64_t ret = 0;
samples_per_block = av_get_audio_frame_duration2(par, par->block_align);
timestamp /= samples_per_block;
ret = avio_seek(s->pb, vpk->data_start + timestamp * par->block_align, SEEK_SET);
if (ret < 0)
return ret;
vpk->current_block = timestamp;
ff_update_cur_dts(s, st, timestamp * samples_per_block);
return 0;
}
AVInputFormat ff_vpk_demuxer = {
.name = "vpk",
.long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
@ -114,5 +138,6 @@ AVInputFormat ff_vpk_demuxer = {
.read_probe = vpk_probe,
.read_header = vpk_read_header,
.read_packet = vpk_read_packet,
.read_seek = vpk_read_seek,
.extensions = "vpk",
};