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ffmpeg.wasm-core
Commit 0638c2ae authored by Kostya Shishkov's avatar Kostya Shishkov
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Add functions for decoding >16 bits WavPack files. 

Based on patches by Laurent Aimar (fenrir >whirlpool< videolan >dit< org)

Originally committed as revision 18667 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 760db32a
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Showing with 155 additions and 9 deletions
libavcodec/wavpack.c
View file @ 0638c2ae
......@@ -463,13 +463,142 @@ static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
return count;
}
static int wv_unpack_stereo_hires(WavpackContext *s, GetBitContext *gb, int32_t *dst)
{
int i, j, count = 0;
int last, t;
int A, B, L, L2, R, R2, bit;
int pos = 0;
uint32_t crc = 0xFFFFFFFF;
s->one = s->zero = s->zeroes = 0;
do{
L = wv_get_value(s, gb, 0, &last);
if(last) break;
R = wv_get_value(s, gb, 1, &last);
if(last) break;
for(i = 0; i < s->terms; i++){
t = s->decorr[i].value;
j = 0;
if(t > 0){
if(t > 8){
if(t & 1){
A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
}else{
A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
}
s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
j = 0;
}else{
A = s->decorr[i].samplesA[pos];
B = s->decorr[i].samplesB[pos];
j = (pos + t) & 7;
}
L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
s->decorr[i].samplesA[j] = L = L2;
s->decorr[i].samplesB[j] = R = R2;
}else if(t == -1){
L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
L = L2;
R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
R = R2;
s->decorr[i].samplesA[0] = R;
}else{
R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
R = R2;
if(t == -3){
R2 = s->decorr[i].samplesA[0];
s->decorr[i].samplesA[0] = R;
}
L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
L = L2;
s->decorr[i].samplesB[0] = L;
}
}
pos = (pos + 1) & 7;
if(s->joint)
L += (R -= (L >> 1));
crc = (crc * 3 + L) * 3 + R;
bit = (L & s->and) | s->or;
*dst++ = (((L + bit) << s->shift) - bit) << s->post_shift;
bit = (R & s->and) | s->or;
*dst++ = (((R + bit) << s->shift) - bit) << s->post_shift;
count++;
}while(!last && count < s->samples);
if(crc != s->CRC){
av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
return -1;
}
return count * 2;
}
static int wv_unpack_mono_hires(WavpackContext *s, GetBitContext *gb, int32_t *dst)
{
int i, j, count = 0;
int last, t;
int A, S, T, bit;
int pos = 0;
uint32_t crc = 0xFFFFFFFF;
s->one = s->zero = s->zeroes = 0;
do{
T = wv_get_value(s, gb, 0, &last);
S = 0;
if(last) break;
for(i = 0; i < s->terms; i++){
t = s->decorr[i].value;
if(t > 8){
if(t & 1)
A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
else
A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
j = 0;
}else{
A = s->decorr[i].samplesA[pos];
j = (pos + t) & 7;
}
S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
s->decorr[i].samplesA[j] = T = S;
}
pos = (pos + 1) & 7;
crc = crc * 3 + S;
bit = (S & s->and) | s->or;
*dst++ = (((S + bit) << s->shift) - bit) << s->post_shift;
count++;
}while(!last && count < s->samples);
if(crc != s->CRC){
av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
return -1;
}
return count;
}
static av_cold int wavpack_decode_init(AVCodecContext *avctx)
{
WavpackContext *s = avctx->priv_data;
s->avctx = avctx;
s->stereo = (avctx->channels == 2);
avctx->sample_fmt = SAMPLE_FMT_S16;
if(avctx->bits_per_coded_sample <= 16)
avctx->sample_fmt = SAMPLE_FMT_S16;
else
avctx->sample_fmt = SAMPLE_FMT_S32;
avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
return 0;
......@@ -483,11 +612,13 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
int buf_size = avpkt->size;
WavpackContext *s = avctx->priv_data;
int16_t *samples = data;
int32_t *samples32 = data;
int samplecount;
int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
int got_hybrid = 0;
const uint8_t* buf_end = buf + buf_size;
int i, j, id, size, ssize, weights, t;
int bpp = avctx->bits_per_coded_sample <= 16 ? 2 : 4;
if (buf_size == 0){
*data_size = 0;
......@@ -504,7 +635,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
return buf_size;
}
/* should not happen but who knows */
if(s->samples * 2 * avctx->channels > *data_size){
if(s->samples * bpp * avctx->channels > *data_size){
av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
return -1;
}
......@@ -513,7 +644,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
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 = (s->frame_flags >> 13) & 0x1f;
s->post_shift = 8 * (bpp-1-(s->frame_flags&0x03)) + ((s->frame_flags >> 13) & 0x1f);
s->CRC = AV_RL32(buf); buf += 4;
// parse metadata blocks
while(buf < buf_end){
......@@ -701,11 +832,17 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
return -1;
}
if(s->stereo_in)
samplecount = wv_unpack_stereo(s, &s->gb, samples);
else{
samplecount = wv_unpack_mono(s, &s->gb, samples);
if(s->stereo){
if(s->stereo_in){
if(bpp == 2)
samplecount = wv_unpack_stereo(s, &s->gb, samples);
else
samplecount = wv_unpack_stereo_hires(s, &s->gb, samples32);
}else{
if(bpp == 2)
samplecount = wv_unpack_mono(s, &s->gb, samples);
else
samplecount = wv_unpack_mono_hires(s, &s->gb, samples32);
if(s->stereo && bpp == 2){
int16_t *dst = samples + samplecount * 2;
int16_t *src = samples + samplecount;
int cnt = samplecount;
......@@ -714,9 +851,18 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
*--dst = *src;
}
samplecount *= 2;
}else if(s->stereo){ //32-bit output
int32_t *dst = samples32 + samplecount * 2;
int32_t *src = samples32 + samplecount;
int cnt = samplecount;
while(cnt--){
*--dst = *--src;
*--dst = *src;
}
samplecount *= 2;
}
}
*data_size = samplecount * 2;
*data_size = samplecount * bpp;
return buf_size;
}
......
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