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ffmpeg
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Extend WavPack demuxer and decoder to support >2 channel audio 

Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
This commit is contained in:
Kostya 2011-01-22 13:43:15 +00:00 committed by Janne Grunau
parent 07b48f8c7a
commit 3bdc886c22
2 changed files with 324 additions and 66 deletions
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266
libavcodec/wavpack.c
View File

@ -1,6 +1,6 @@
/*
* WavPack lossless audio decoder
* Copyright (c) 2006 Konstantin Shishkov
* Copyright (c) 2006,2011 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
@ -91,7 +91,7 @@ typedef struct WvChannel {
int bitrate_acc, bitrate_delta;
} WvChannel;
typedef struct WavpackContext {
typedef struct WavpackFrameContext {
AVCodecContext *avctx;
int frame_flags;
int stereo, stereo_in;
@ -118,6 +118,22 @@ typedef struct WavpackContext {
int max_samples;
int pos;
SavedContext sc, extra_sc;
} WavpackFrameContext;
#define WV_MAX_FRAME_DECODERS 14
typedef struct WavpackContext {
AVCodecContext *avctx;
WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];
int fdec_num;
int multichannel;
int mkv_mode;
int block;
int samples;
int samples_left;
int ch_offset;
} WavpackContext;
// exponent table copied from WavPack source
@ -224,7 +240,7 @@ static av_always_inline int get_tail(GetBitContext *gb, int k)
return res;
}
static void update_error_limit(WavpackContext *ctx)
static void update_error_limit(WavpackFrameContext *ctx)
{
int i, br[2], sl[2];
@ -258,7 +274,7 @@ static void update_error_limit(WavpackContext *ctx)
}
}
static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int channel, int *last)
static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb, int channel, int *last)
{
int t, t2;
int sign, base, add, ret;
@ -361,7 +377,7 @@ static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int channel, int
return sign ? ~ret : ret;
}
static inline int wv_get_value_integer(WavpackContext *s, uint32_t *crc, int S)
static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc, int S)
{
int bit;
@ -377,7 +393,7 @@ static inline int wv_get_value_integer(WavpackContext *s, uint32_t *crc, int S)
return (((S + bit) << s->shift) - bit) << s->post_shift;
}
static float wv_get_value_float(WavpackContext *s, uint32_t *crc, int S)
static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
{
union {
float f;
@ -450,13 +466,13 @@ static float wv_get_value_float(WavpackContext *s, uint32_t *crc, int S)
return value.f;
}
static void wv_reset_saved_context(WavpackContext *s)
static void wv_reset_saved_context(WavpackFrameContext *s)
{
s->pos = 0;
s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
}
static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *dst, const int type)
static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb, void *dst, const int type)
{
int i, j, count = 0;
int last, t;
@ -467,6 +483,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
int16_t *dst16 = dst;
int32_t *dst32 = dst;
float *dstfl = dst;
const int channel_pad = s->avctx->channels - 2;
if(s->samples_left == s->samples)
s->one = s->zero = s->zeroes = 0;
@ -549,12 +566,15 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
if(type == AV_SAMPLE_FMT_FLT){
*dstfl++ = wv_get_value_float(s, &crc_extra_bits, L);
*dstfl++ = wv_get_value_float(s, &crc_extra_bits, R);
dstfl += channel_pad;
} else if(type == AV_SAMPLE_FMT_S32){
*dst32++ = wv_get_value_integer(s, &crc_extra_bits, L);
*dst32++ = wv_get_value_integer(s, &crc_extra_bits, R);
dst32 += channel_pad;
} else {
*dst16++ = wv_get_value_integer(s, &crc_extra_bits, L);
*dst16++ = wv_get_value_integer(s, &crc_extra_bits, R);
dst16 += channel_pad;
}
count++;
}while(!last && count < s->max_samples);
@ -582,7 +602,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
return count * 2;
}
static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst, const int type)
static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb, void *dst, const int type)
{
int i, j, count = 0;
int last, t;
@ -593,6 +613,7 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
int16_t *dst16 = dst;
int32_t *dst32 = dst;
float *dstfl = dst;
const int channel_stride = s->avctx->channels;
if(s->samples_left == s->samples)
s->one = s->zero = s->zeroes = 0;
@ -623,12 +644,16 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
pos = (pos + 1) & 7;
crc = crc * 3 + S;
if(type == AV_SAMPLE_FMT_FLT)
*dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);
else if(type == AV_SAMPLE_FMT_S32)
*dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);
else
*dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);
if(type == AV_SAMPLE_FMT_FLT){
*dstfl = wv_get_value_float(s, &crc_extra_bits, S);
dstfl += channel_stride;
}else if(type == AV_SAMPLE_FMT_S32){
*dst32 = wv_get_value_integer(s, &crc_extra_bits, S);
dst32 += channel_stride;
}else{
*dst16 = wv_get_value_integer(s, &crc_extra_bits, S);
dst16 += channel_stride;
}
count++;
}while(!last && count < s->max_samples);
@ -655,47 +680,92 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
return count;
}
static av_cold int wv_alloc_frame_context(WavpackContext *c)
{
if(c->fdec_num == WV_MAX_FRAME_DECODERS)
return -1;
c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
if(!c->fdec[c->fdec_num])
return -1;
c->fdec_num++;
c->fdec[c->fdec_num - 1]->avctx = c->avctx;
wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
return 0;
}
static av_cold int wavpack_decode_init(AVCodecContext *avctx)
{
WavpackContext *s = avctx->priv_data;
s->avctx = avctx;
if (avctx->channels > 2) {
av_log(avctx, AV_LOG_ERROR, "Multichannel WavPack is not supported yet.\n");
return -1;
}
s->stereo = (avctx->channels == 2);
if(avctx->bits_per_coded_sample <= 16)
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
else
avctx->sample_fmt = AV_SAMPLE_FMT_S32;
if(avctx->channels <= 2 && !avctx->channel_layout)
avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
wv_reset_saved_context(s);
s->multichannel = avctx->channels > 2;
/* lavf demuxer does not provide extradata, Matroska stores 0x403
there, use this to detect decoding mode for multichannel */
s->mkv_mode = 0;
if(s->multichannel && avctx->extradata && avctx->extradata_size == 2){
int ver = AV_RL16(avctx->extradata);
if(ver >= 0x402 && ver <= 0x410)
s->mkv_mode = 1;
}
s->fdec_num = 0;
return 0;
}
static int wavpack_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
static av_cold int wavpack_decode_end(AVCodecContext *avctx)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
WavpackContext *s = avctx->priv_data;
int i;
for(i = 0; i < s->fdec_num; i++)
av_freep(&s->fdec[i]);
s->fdec_num = 0;
return 0;
}
static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
WavpackContext *wc = avctx->priv_data;
WavpackFrameContext *s;
void *samples = data;
int samplecount;
int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0, got_float = 0;
int got_hybrid = 0;
const uint8_t* orig_buf = buf;
const uint8_t* buf_end = buf + buf_size;
int i, j, id, size, ssize, weights, t;
int bpp;
int bpp, chan, chmask;
if (buf_size == 0){
*data_size = 0;
return 0;
}
if(block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0){
av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
return -1;
}
s = wc->fdec[block_no];
if(!s){
av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n", block_no);
return -1;
}
if(!s->samples_left){
memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
memset(s->ch, 0, sizeof(s->ch));
@ -704,11 +774,15 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
s->got_extra_bits = 0;
}
if(!wc->mkv_mode){
s->samples = AV_RL32(buf); buf += 4;
if(!s->samples){
*data_size = 0;
return buf_size;
}
}else{
s->samples = wc->samples;
}
s->frame_flags = AV_RL32(buf); buf += 4;
if(s->frame_flags&0x80){
bpp = sizeof(float);
@ -720,12 +794,19 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
bpp = 4;
avctx->sample_fmt = AV_SAMPLE_FMT_S32;
}
samples = (uint8_t*)samples + bpp * wc->ch_offset;
s->stereo = !(s->frame_flags & WV_MONO);
s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
s->joint = s->frame_flags & WV_JOINT_STEREO;
s->hybrid = s->frame_flags & WV_HYBRID_MODE;
s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
s->post_shift = 8 * (bpp-1-(s->frame_flags&0x03)) + ((s->frame_flags >> 13) & 0x1f);
s->CRC = AV_RL32(buf); buf += 4;
if(wc->mkv_mode)
buf += 4; //skip block size;
wc->ch_offset += 1 + s->stereo;
s->max_samples = *data_size / (bpp * avctx->channels);
s->max_samples = FFMIN(s->max_samples, s->samples);
@ -899,7 +980,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
got_float = 1;
break;
case WP_ID_DATA:
s->sc.offset = buf - avpkt->data;
s->sc.offset = buf - orig_buf;
s->sc.size = size * 8;
init_get_bits(&s->gb, buf, size * 8);
s->data_size = size * 8;
@ -912,13 +993,50 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
buf += size;
continue;
}
s->extra_sc.offset = buf - avpkt->data;
s->extra_sc.offset = buf - orig_buf;
s->extra_sc.size = size * 8;
init_get_bits(&s->gb_extra_bits, buf, size * 8);
s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
buf += size;
s->got_extra_bits = 1;
break;
case WP_ID_CHANINFO:
if(size <= 1){
av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");
return -1;
}
chan = *buf++;
switch(size - 2){
case 0:
chmask = *buf;
break;
case 1:
chmask = AV_RL16(buf);
break;
case 2:
chmask = AV_RL24(buf);
break;
case 3:
chmask = AV_RL32(buf);
break;
case 5:
chan |= (buf[1] & 0xF) << 8;
chmask = AV_RL24(buf + 2);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);
chan = avctx->channels;
chmask = avctx->channel_layout;
}
if(chan != avctx->channels){
av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, decoder believes it's %d channels\n",
chan, avctx->channels);
return -1;
}
if(!avctx->channel_layout)
avctx->channel_layout = chmask;
buf += size - 1;
break;
default:
buf += size;
}
@ -963,10 +1081,10 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
}
s->samples_left = s->samples;
}else{
init_get_bits(&s->gb, avpkt->data + s->sc.offset, s->sc.size);
init_get_bits(&s->gb, orig_buf + s->sc.offset, s->sc.size);
skip_bits_long(&s->gb, s->sc.bits_used);
if(s->got_extra_bits){
init_get_bits(&s->gb_extra_bits, avpkt->data + s->extra_sc.offset,
init_get_bits(&s->gb_extra_bits, orig_buf + s->extra_sc.offset,
s->extra_sc.size);
skip_bits_long(&s->gb_extra_bits, s->extra_sc.bits_used);
}
@ -979,8 +1097,10 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);
else
samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);
samplecount >>= 1;
}else{
const int channel_stride = avctx->channels;
if(avctx->sample_fmt == AV_SAMPLE_FMT_S16)
samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);
else if(avctx->sample_fmt == AV_SAMPLE_FMT_S32)
@ -989,37 +1109,83 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);
if(s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16){
int16_t *dst = (int16_t*)samples + samplecount * 2;
int16_t *src = (int16_t*)samples + samplecount;
int16_t *dst = (int16_t*)samples + 1;
int16_t *src = (int16_t*)samples;
int cnt = samplecount;
while(cnt--){
*--dst = *--src;
*--dst = *src;
*dst = *src;
src += channel_stride;
dst += channel_stride;
}
samplecount *= 2;
}else if(s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32){
int32_t *dst = (int32_t*)samples + samplecount * 2;
int32_t *src = (int32_t*)samples + samplecount;
int32_t *dst = (int32_t*)samples + 1;
int32_t *src = (int32_t*)samples;
int cnt = samplecount;
while(cnt--){
*--dst = *--src;
*--dst = *src;
*dst = *src;
src += channel_stride;
dst += channel_stride;
}
samplecount *= 2;
}else if(s->stereo){
float *dst = (float*)samples + samplecount * 2;
float *src = (float*)samples + samplecount;
float *dst = (float*)samples + 1;
float *src = (float*)samples;
int cnt = samplecount;
while(cnt--){
*--dst = *--src;
*--dst = *src;
*dst = *src;
src += channel_stride;
dst += channel_stride;
}
samplecount *= 2;
}
}
*data_size = samplecount * bpp;
return s->samples_left > 0 ? 0 : buf_size;
wc->samples_left = s->samples_left;
return samplecount * bpp;
}
static int wavpack_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
WavpackContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int frame_size;
int samplecount = 0;
s->block = 0;
s->samples_left = 0;
s->ch_offset = 0;
if(s->mkv_mode){
s->samples = AV_RL32(buf); buf += 4;
}
while(buf_size > 0){
if(!s->multichannel){
frame_size = buf_size;
}else{
if(!s->mkv_mode){
frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;
}else{
if(buf_size < 12) //MKV files can have zero flags after last block
break;
frame_size = AV_RL32(buf + 8) + 12;
}
}
if(frame_size < 0 || frame_size > buf_size){
av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d vs. %d bytes left)\n",
s->block, frame_size, buf_size);
return -1;
}
if((samplecount = wavpack_decode_block(avctx, s->block, data,
data_size, buf, frame_size)) < 0)
return -1;
s->block++;
buf += frame_size; buf_size -= frame_size;
}
*data_size = samplecount * avctx->channels;
return s->samples_left > 0 ? 0 : avpkt->size;
}
AVCodec wavpack_decoder = {
@ -1029,7 +1195,7 @@ AVCodec wavpack_decoder = {
sizeof(WavpackContext),
wavpack_decode_init,
NULL,
NULL,
wavpack_decode_end,
wavpack_decode_frame,
.capabilities = CODEC_CAP_SUBFRAMES,
.long_name = NULL_IF_CONFIG_SMALL("WavPack"),

124
libavformat/wv.c
View File

@ -1,6 +1,6 @@
/*
* WavPack demuxer
* Copyright (c) 2006 Konstantin Shishkov
* Copyright (c) 2006,2011 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
@ -29,6 +29,10 @@
#define WV_EXTRA_SIZE 12
#define WV_START_BLOCK 0x0800
#define WV_END_BLOCK 0x1000
#define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
enum WV_FLAGS{
WV_MONO = 0x0004,
WV_HYBRID = 0x0008,
@ -51,7 +55,9 @@ static const int wv_rates[16] = {
typedef struct{
uint32_t blksize, flags;
int rate, chan, bpp;
uint32_t chmask;
uint32_t samples, soff;
int multichannel;
int block_parsed;
uint8_t extra[WV_EXTRA_SIZE];
int64_t pos;
@ -69,14 +75,16 @@ static int wv_probe(AVProbeData *p)
return 0;
}
static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb, int append)
{
WVContext *wc = ctx->priv_data;
uint32_t tag, ver;
int size;
int rate, bpp, chan;
uint32_t chmask;
wc->pos = url_ftell(pb);
if(!append){
tag = get_le32(pb);
if (tag != MKTAG('w', 'v', 'p', 'k'))
return -1;
@ -96,19 +104,24 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
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);
}else{
size = wc->blksize;
}
wc->flags = AV_RL32(wc->extra + 4);
//parse flags
bpp = ((wc->flags & 3) + 1) << 3;
chan = 1 + !(wc->flags & WV_MONO);
chmask = wc->flags & WV_MONO ? CH_LAYOUT_MONO : CH_LAYOUT_STEREO;
rate = wv_rates[(wc->flags >> 23) & 0xF];
if((wc->flags & 0x1800) != 0x1800){
av_log(ctx, AV_LOG_ERROR, "Multichannel WavPack is not supported yet.\n");
return -1;
wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
if(wc->multichannel){
chan = wc->chan;
chmask = wc->chmask;
}
if(rate == -1 && !wc->block_parsed){
if((rate == -1 || !chan) && !wc->block_parsed){
int64_t block_end = url_ftell(pb) + wc->blksize - 24;
if(url_is_streamed(pb)){
av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
av_log(ctx, AV_LOG_ERROR, "Cannot determine additional parameters\n");
return -1;
}
while(url_ftell(pb) < block_end){
@ -118,12 +131,44 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
size <<= 1;
if(id&0x40)
size--;
if((id&0x3F) == 0x27){
switch(id&0x3F){
case 0xD:
if(size <= 1){
av_log(ctx, AV_LOG_ERROR, "Insufficient channel information\n");
return -1;
}
chan = get_byte(pb);
switch(size - 2){
case 0:
chmask = get_byte(pb);
break;
case 1:
chmask = get_le16(pb);
break;
case 2:
chmask = get_le24(pb);
break;
case 3:
chmask = get_le32(pb);
break;
case 5:
url_fskip(pb, 1);
chan |= (get_byte(pb) & 0xF) << 8;
chmask = get_le24(pb);
break;
default:
av_log(ctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);
return -1;
}
break;
case 0x27:
rate = get_le24(pb);
break;
}else{
default:
url_fskip(pb, size);
}
if(id&0x40)
url_fskip(pb, 1);
}
if(rate == -1){
av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
@ -133,13 +178,14 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
}
if(!wc->bpp) wc->bpp = bpp;
if(!wc->chan) wc->chan = chan;
if(!wc->chmask) wc->chmask = chmask;
if(!wc->rate) wc->rate = rate;
if(wc->flags && bpp != wc->bpp){
av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
return -1;
}
if(wc->flags && chan != wc->chan){
if(wc->flags && !wc->multichannel && chan != wc->chan){
av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
return -1;
}
@ -159,7 +205,7 @@ static int wv_read_header(AVFormatContext *s,
AVStream *st;
wc->block_parsed = 0;
if(wv_read_block_header(s, pb) < 0)
if(wv_read_block_header(s, pb, 0) < 0)
return -1;
/* now we are ready: build format streams */
@ -169,6 +215,7 @@ static int wv_read_header(AVFormatContext *s,
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_WAVPACK;
st->codec->channels = wc->chan;
st->codec->channel_layout = wc->chmask;
st->codec->sample_rate = wc->rate;
st->codec->bits_per_coded_sample = wc->bpp;
av_set_pts_info(st, 64, 1, wc->rate);
@ -191,25 +238,70 @@ static int wv_read_packet(AVFormatContext *s,
{
WVContext *wc = s->priv_data;
int ret;
int size, ver, off;
if (url_feof(s->pb))
return AVERROR(EIO);
if(wc->block_parsed){
if(wv_read_block_header(s, s->pb) < 0)
if(wv_read_block_header(s, s->pb, 0) < 0)
return -1;
}
if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
off = wc->multichannel ? 4 : 0;
if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
if(wc->multichannel)
AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12);
memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE);
ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize);
if(ret != wc->blksize){
av_free_packet(pkt);
return AVERROR(EIO);
}
while(!(wc->flags & WV_END_BLOCK)){
if(get_le32(s->pb) != MKTAG('w', 'v', 'p', 'k')){
av_free_packet(pkt);
return -1;
}
if((ret = av_append_packet(s->pb, pkt, 4)) < 0){
av_free_packet(pkt);
return ret;
}
size = AV_RL32(pkt->data + pkt->size - 4);
if(size < 24 || size > WV_BLOCK_LIMIT){
av_free_packet(pkt);
av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size);
return -1;
}
wc->blksize = size;
ver = get_le16(s->pb);
if(ver < 0x402 || ver > 0x410){
av_free_packet(pkt);
av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
return -1;
}
get_byte(s->pb); // track no
get_byte(s->pb); // track sub index
wc->samples = get_le32(s->pb); // total samples in file
wc->soff = get_le32(s->pb); // offset in samples of current block
if((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0){
av_free_packet(pkt);
return ret;
}
memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE);
if(wv_read_block_header(s, s->pb, 1) < 0){
av_free_packet(pkt);
return -1;
}
ret = av_append_packet(s->pb, pkt, wc->blksize);
if(ret < 0){
av_free_packet(pkt);
return ret;
}
}
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;