2 * WavPack lossless audio decoder
3 * Copyright (c) 2006 Konstantin Shishkov
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #define ALT_BITSTREAM_READER_LE
21 #include "bitstream.h"
25 * WavPack lossless audio decoder
28 #define WV_JOINT 0x0010
56 typedef struct Decorr {
65 typedef struct WavpackContext {
66 AVCodecContext *avctx;
71 int data_size; // in bits
75 Decorr decorr[MAX_TERMS];
76 int zero, one, zeroes;
79 // exponent table copied from WavPack source
80 static const uint8_t wp_exp2_table [256] = {
81 0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
82 0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
83 0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
84 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
85 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
86 0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
87 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
88 0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
89 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
90 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
91 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
92 0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
93 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
94 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
95 0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
96 0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
99 static always_inline int wp_exp2(int16_t val)
108 res = wp_exp2_table[val & 0xFF] | 0x100;
110 res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
111 return neg ? -res : res;
114 static inline int get_unary(GetBitContext *gb){
116 while(get_bits1(gb) && r<33)r++;
120 // macros for manipulating median values
121 #define GET_MED(n) ((median[n] >> 4) + 1)
122 #define DEC_MED(n) median[n] -= ((median[n] + (128>>n) - 2) / (128>>n)) * 2
123 #define INC_MED(n) median[n] += ((median[n] + (128>>n)) / (128>>n)) * 5
125 // macros for applying weight
126 #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
128 if((samples ^ in) < 0){ \
130 if(weight < -1024) weight = -1024; \
133 if(weight > 1024) weight = 1024; \
138 static always_inline int get_tail(GetBitContext *gb, int k)
142 if(k<1 || k>65535)return 0;
143 p = av_log2_16bit(k);
144 e = (1 << (p + 1)) - k - 1;
145 res = get_bits(gb, p);
147 res = (res<<1) - e + get_bits1(gb);
152 static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int *last)
155 int sign, base, add, ret;
159 if((ctx->median[0] < 2U) && (ctx->median[3] < 2U) && !ctx->zero && !ctx->one){
166 if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1));
169 memset(ctx->median, 0, sizeof(ctx->median));
175 if(get_bits_count(gb) >= ctx->data_size){
185 if(get_bits_count(gb) >= ctx->data_size){
192 else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
202 ctx->zero = !ctx->one;
207 add = GET_MED(0) - 1;
211 add = GET_MED(1) - 1;
215 base = GET_MED(0) + GET_MED(1);
216 add = GET_MED(2) - 1;
221 base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
222 add = GET_MED(2) - 1;
227 ret = base + get_tail(gb, add);
228 sign = get_bits1(gb);
229 return sign ? ~ret : ret;
232 static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst)
236 int A, B, L, L2, R, R2;
238 uint32_t crc = 0xFFFFFFFF;
240 s->one = s->zero = s->zeroes = 0;
242 L = wv_get_value(s, gb, s->median, &last);
244 R = wv_get_value(s, gb, s->median + 3, &last);
246 for(i = 0; i < s->terms; i++){
247 t = s->decorr[i].value;
252 A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
253 B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
255 A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
256 B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
258 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
259 s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
262 A = s->decorr[i].samplesA[pos];
263 B = s->decorr[i].samplesB[pos];
266 L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
267 R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
268 if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
269 if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
270 s->decorr[i].samplesA[j] = L = L2;
271 s->decorr[i].samplesB[j] = R = R2;
273 L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
274 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
276 R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
277 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
279 s->decorr[i].samplesA[0] = R;
281 R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
282 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
286 R2 = s->decorr[i].samplesA[0];
287 s->decorr[i].samplesA[0] = R;
290 L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
291 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
293 s->decorr[i].samplesB[0] = L;
298 L += (R -= (L >> 1));
299 crc = (crc * 3 + L) * 3 + R;
304 }while(!last && count < s->samples);
307 av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
313 static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
319 uint32_t crc = 0xFFFFFFFF;
321 s->one = s->zero = s->zeroes = 0;
323 T = wv_get_value(s, gb, s->median, &last);
326 for(i = 0; i < s->terms; i++){
327 t = s->decorr[i].value;
330 A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
332 A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
333 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
336 A = s->decorr[i].samplesA[pos];
339 S = T + ((s->decorr[i].weightA * A + 512) >> 10);
340 if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
341 s->decorr[i].samplesA[j] = T = S;
347 }while(!last && count < s->samples);
350 av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
356 static int wavpack_decode_init(AVCodecContext *avctx)
358 WavpackContext *s = avctx->priv_data;
361 s->stereo = (avctx->channels == 2);
366 static int wavpack_decode_close(AVCodecContext *avctx)
368 // WavpackContext *s = avctx->priv_data;
373 static int wavpack_decode_frame(AVCodecContext *avctx,
374 void *data, int *data_size,
375 uint8_t *buf, int buf_size)
377 WavpackContext *s = avctx->priv_data;
378 int16_t *samples = data;
380 int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
381 uint8_t* buf_end = buf + buf_size;
382 int i, j, id, size, ssize, weights, t;
384 if (buf_size == 0) return 0;
386 memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
388 s->samples = LE_32(buf); buf += 4;
389 s->joint = LE_32(buf) & WV_JOINT; buf += 4;
390 s->CRC = LE_32(buf); buf += 4;
391 // parse metadata blocks
392 while(buf < buf_end){
395 if(id & WP_IDF_LONG) {
396 size |= (*buf++) << 8;
397 size |= (*buf++) << 16;
399 size <<= 1; // size is specified in words
401 if(id & WP_IDF_ODD) size--;
403 av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
406 if(buf + ssize > buf_end){
407 av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
410 if(id & WP_IDF_IGNORE){
414 switch(id & WP_IDF_MASK){
417 if(s->terms > MAX_TERMS){
418 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
422 for(i = 0; i < s->terms; i++) {
423 s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
424 s->decorr[s->terms - i - 1].delta = *buf >> 5;
429 case WP_ID_DECWEIGHTS:
431 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
434 weights = size >> s->stereo;
435 if(weights > MAX_TERMS || weights > s->terms){
436 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
440 for(i = 0; i < weights; i++) {
441 t = (int8_t)(*buf++);
442 s->decorr[s->terms - i - 1].weightA = t << 3;
443 if(s->decorr[s->terms - i - 1].weightA > 0)
444 s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
446 t = (int8_t)(*buf++);
447 s->decorr[s->terms - i - 1].weightB = t << 3;
448 if(s->decorr[s->terms - i - 1].weightB > 0)
449 s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
454 case WP_ID_DECSAMPLES:
456 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
460 for(i = s->terms - 1; (i >= 0) && (t < size); i--) {
461 if(s->decorr[i].value > 8){
462 s->decorr[i].samplesA[0] = wp_exp2(LE_16(buf)); buf += 2;
463 s->decorr[i].samplesA[1] = wp_exp2(LE_16(buf)); buf += 2;
465 s->decorr[i].samplesB[0] = wp_exp2(LE_16(buf)); buf += 2;
466 s->decorr[i].samplesB[1] = wp_exp2(LE_16(buf)); buf += 2;
470 }else if(s->decorr[i].value < 0){
471 s->decorr[i].samplesA[0] = wp_exp2(LE_16(buf)); buf += 2;
472 s->decorr[i].samplesB[0] = wp_exp2(LE_16(buf)); buf += 2;
475 for(j = 0; j < s->decorr[i].value; j++){
476 s->decorr[i].samplesA[j] = wp_exp2(LE_16(buf)); buf += 2;
478 s->decorr[i].samplesB[j] = wp_exp2(LE_16(buf)); buf += 2;
481 t += s->decorr[i].value * 2 * avctx->channels;
487 if(size != 6 * avctx->channels){
488 av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * avctx->channels, size);
492 for(i = 0; i < 3 * avctx->channels; i++){
493 s->median[i] = wp_exp2(LE_16(buf));
499 init_get_bits(&s->gb, buf, size * 8);
500 s->data_size = size * 8;
507 if(id & WP_IDF_ODD) buf++;
510 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
514 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
518 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
522 av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
526 av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
531 samplecount = wv_unpack_stereo(s, &s->gb, samples);
533 samplecount = wv_unpack_mono(s, &s->gb, samples);
534 *data_size = samplecount * 2;
539 AVCodec wavpack_decoder = {
543 sizeof(WavpackContext),
546 wavpack_decode_close,
547 wavpack_decode_frame,