2 * WavPack lossless audio decoder
3 * Copyright (c) 2006,2011 Konstantin Shishkov
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #define ALT_BITSTREAM_READER_LE
25 #include "libavutil/audioconvert.h"
29 * WavPack lossless audio decoder
32 #define WV_MONO 0x00000004
33 #define WV_JOINT_STEREO 0x00000010
34 #define WV_FALSE_STEREO 0x40000000
36 #define WV_HYBRID_MODE 0x00000008
37 #define WV_HYBRID_SHAPE 0x00000008
38 #define WV_HYBRID_BITRATE 0x00000200
39 #define WV_HYBRID_BALANCE 0x00000400
41 #define WV_FLT_SHIFT_ONES 0x01
42 #define WV_FLT_SHIFT_SAME 0x02
43 #define WV_FLT_SHIFT_SENT 0x04
44 #define WV_FLT_ZERO_SENT 0x08
45 #define WV_FLT_ZERO_SIGN 0x10
71 typedef struct SavedContext {
80 typedef struct Decorr {
89 typedef struct WvChannel {
91 int slow_level, error_limit;
92 int bitrate_acc, bitrate_delta;
95 typedef struct WavpackFrameContext {
96 AVCodecContext *avctx;
98 int stereo, stereo_in;
103 uint32_t crc_extra_bits;
104 GetBitContext gb_extra_bits;
105 int data_size; // in bits
108 Decorr decorr[MAX_TERMS];
109 int zero, one, zeroes;
113 int hybrid, hybrid_bitrate;
121 SavedContext sc, extra_sc;
122 } WavpackFrameContext;
124 #define WV_MAX_FRAME_DECODERS 14
126 typedef struct WavpackContext {
127 AVCodecContext *avctx;
129 WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];
140 // exponent table copied from WavPack source
141 static const uint8_t wp_exp2_table [256] = {
142 0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
143 0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
144 0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
145 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
146 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
147 0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
148 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
149 0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
150 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
151 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
152 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
153 0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
154 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
155 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
156 0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
157 0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
160 static const uint8_t wp_log2_table [] = {
161 0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,
162 0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,
163 0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,
164 0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,
165 0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,
166 0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,
167 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
168 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
169 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
170 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,
171 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,
172 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,
173 0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,
174 0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,
175 0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,
176 0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff
179 static av_always_inline int wp_exp2(int16_t val)
188 res = wp_exp2_table[val & 0xFF] | 0x100;
190 res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
191 return neg ? -res : res;
194 static av_always_inline int wp_log2(int32_t val)
203 bits = av_log2(val) + 1;
205 return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF];
207 return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF];
210 #define LEVEL_DECAY(a) ((a + 0x80) >> 8)
212 // macros for manipulating median values
213 #define GET_MED(n) ((c->median[n] >> 4) + 1)
214 #define DEC_MED(n) c->median[n] -= ((c->median[n] + (128>>n) - 2) / (128>>n)) * 2
215 #define INC_MED(n) c->median[n] += ((c->median[n] + (128>>n)) / (128>>n)) * 5
217 // macros for applying weight
218 #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
220 if((samples ^ in) < 0){ \
222 if(weight < -1024) weight = -1024; \
225 if(weight > 1024) weight = 1024; \
230 static av_always_inline int get_tail(GetBitContext *gb, int k)
236 e = (1 << (p + 1)) - k - 1;
237 res = p ? get_bits(gb, p) : 0;
239 res = (res<<1) - e + get_bits1(gb);
244 static void update_error_limit(WavpackFrameContext *ctx)
248 for(i = 0; i <= ctx->stereo_in; i++){
249 ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta;
250 br[i] = ctx->ch[i].bitrate_acc >> 16;
251 sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level);
253 if(ctx->stereo_in && ctx->hybrid_bitrate){
254 int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;
258 }else if(-balance > br[0]){
262 br[1] = br[0] + balance;
263 br[0] = br[0] - balance;
266 for(i = 0; i <= ctx->stereo_in; i++){
267 if(ctx->hybrid_bitrate){
268 if(sl[i] - br[i] > -0x100)
269 ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);
271 ctx->ch[i].error_limit = 0;
273 ctx->ch[i].error_limit = wp_exp2(br[i]);
278 static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb, int channel, int *last)
281 int sign, base, add, ret;
282 WvChannel *c = &ctx->ch[channel];
286 if((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) && !ctx->zero && !ctx->one){
290 c->slow_level -= LEVEL_DECAY(c->slow_level);
294 t = get_unary_0_33(gb);
296 if(get_bits_left(gb) < t-1)
298 t = get_bits(gb, t - 1) | (1 << (t-1));
300 if(get_bits_left(gb) < 0)
305 memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median));
306 memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median));
307 c->slow_level -= LEVEL_DECAY(c->slow_level);
317 t = get_unary_0_33(gb);
318 if(get_bits_left(gb) < 0)
321 t2 = get_unary_0_33(gb);
323 if(get_bits_left(gb) < 0)
327 if(get_bits_left(gb) < t2 - 1)
329 t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
340 ctx->zero = !ctx->one;
343 if(ctx->hybrid && !channel)
344 update_error_limit(ctx);
348 add = GET_MED(0) - 1;
352 add = GET_MED(1) - 1;
356 base = GET_MED(0) + GET_MED(1);
357 add = GET_MED(2) - 1;
362 base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
363 add = GET_MED(2) - 1;
369 ret = base + get_tail(gb, add);
370 if (get_bits_left(gb) <= 0)
373 int mid = (base*2 + add + 1) >> 1;
374 while(add > c->error_limit){
375 if(get_bits_left(gb) <= 0)
381 add = mid - base - 1;
382 mid = (base*2 + add + 1) >> 1;
386 sign = get_bits1(gb);
387 if(ctx->hybrid_bitrate)
388 c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level);
389 return sign ? ~ret : ret;
396 static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc, int S)
403 if(s->got_extra_bits && get_bits_left(&s->gb_extra_bits) >= s->extra_bits){
404 S |= get_bits(&s->gb_extra_bits, s->extra_bits);
405 *crc = *crc * 9 + (S&0xffff) * 3 + ((unsigned)S>>16);
408 bit = (S & s->and) | s->or;
409 return (((S + bit) << s->shift) - bit) << s->post_shift;
412 static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
420 int exp = s->float_max_exp;
422 if(s->got_extra_bits){
423 const int max_bits = 1 + 23 + 8 + 1;
424 const int left_bits = get_bits_left(&s->gb_extra_bits);
426 if(left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
431 S <<= s->float_shift;
436 if(s->got_extra_bits && get_bits1(&s->gb_extra_bits)){
437 S = get_bits(&s->gb_extra_bits, 23);
443 int shift = 23 - av_log2(S);
444 exp = s->float_max_exp;
452 if((s->float_flag & WV_FLT_SHIFT_ONES) ||
453 (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) && get_bits1(&s->gb_extra_bits)) ){
454 S |= (1 << shift) - 1;
455 } else if(s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SENT)){
456 S |= get_bits(&s->gb_extra_bits, shift);
460 exp = s->float_max_exp;
466 if(s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)){
467 if(get_bits1(&s->gb_extra_bits)){
468 S = get_bits(&s->gb_extra_bits, 23);
469 if(s->float_max_exp >= 25)
470 exp = get_bits(&s->gb_extra_bits, 8);
471 sign = get_bits1(&s->gb_extra_bits);
473 if(s->float_flag & WV_FLT_ZERO_SIGN)
474 sign = get_bits1(&s->gb_extra_bits);
479 *crc = *crc * 27 + S * 9 + exp * 3 + sign;
481 value.u = (sign << 31) | (exp << 23) | S;
485 static void wv_reset_saved_context(WavpackFrameContext *s)
489 s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
492 static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb, void *dst, const int type)
496 int A, B, L, L2, R, R2;
498 uint32_t crc = s->sc.crc;
499 uint32_t crc_extra_bits = s->extra_sc.crc;
500 int16_t *dst16 = dst;
501 int32_t *dst32 = dst;
503 const int channel_pad = s->avctx->channels - 2;
505 if(s->samples_left == s->samples)
506 s->one = s->zero = s->zeroes = 0;
508 L = wv_get_value(s, gb, 0, &last);
510 R = wv_get_value(s, gb, 1, &last);
512 for(i = 0; i < s->terms; i++){
513 t = s->decorr[i].value;
517 A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
518 B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
520 A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
521 B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
523 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
524 s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
527 A = s->decorr[i].samplesA[pos];
528 B = s->decorr[i].samplesB[pos];
531 if(type != AV_SAMPLE_FMT_S16){
532 L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
533 R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
535 L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
536 R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
538 if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
539 if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
540 s->decorr[i].samplesA[j] = L = L2;
541 s->decorr[i].samplesB[j] = R = R2;
543 if(type != AV_SAMPLE_FMT_S16)
544 L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
546 L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
547 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
549 if(type != AV_SAMPLE_FMT_S16)
550 R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
552 R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
553 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
555 s->decorr[i].samplesA[0] = R;
557 if(type != AV_SAMPLE_FMT_S16)
558 R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
560 R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
561 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
565 R2 = s->decorr[i].samplesA[0];
566 s->decorr[i].samplesA[0] = R;
569 if(type != AV_SAMPLE_FMT_S16)
570 L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
572 L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
573 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
575 s->decorr[i].samplesB[0] = L;
580 L += (R -= (L >> 1));
581 crc = (crc * 3 + L) * 3 + R;
583 if(type == AV_SAMPLE_FMT_FLT){
584 *dstfl++ = wv_get_value_float(s, &crc_extra_bits, L);
585 *dstfl++ = wv_get_value_float(s, &crc_extra_bits, R);
586 dstfl += channel_pad;
587 } else if(type == AV_SAMPLE_FMT_S32){
588 *dst32++ = wv_get_value_integer(s, &crc_extra_bits, L);
589 *dst32++ = wv_get_value_integer(s, &crc_extra_bits, R);
590 dst32 += channel_pad;
592 *dst16++ = wv_get_value_integer(s, &crc_extra_bits, L);
593 *dst16++ = wv_get_value_integer(s, &crc_extra_bits, R);
594 dst16 += channel_pad;
597 }while(!last && count < s->max_samples);
602 s->samples_left -= count;
603 if(!s->samples_left){
604 wv_reset_saved_context(s);
606 av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
609 if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
610 av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
616 s->sc.bits_used = get_bits_count(&s->gb);
617 if(s->got_extra_bits){
618 s->extra_sc.crc = crc_extra_bits;
619 s->extra_sc.bits_used = get_bits_count(&s->gb_extra_bits);
625 static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb, void *dst, const int type)
631 uint32_t crc = s->sc.crc;
632 uint32_t crc_extra_bits = s->extra_sc.crc;
633 int16_t *dst16 = dst;
634 int32_t *dst32 = dst;
636 const int channel_stride = s->avctx->channels;
638 if(s->samples_left == s->samples)
639 s->one = s->zero = s->zeroes = 0;
641 T = wv_get_value(s, gb, 0, &last);
644 for(i = 0; i < s->terms; i++){
645 t = s->decorr[i].value;
648 A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
650 A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
651 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
654 A = s->decorr[i].samplesA[pos];
657 if(type != AV_SAMPLE_FMT_S16)
658 S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
660 S = T + ((s->decorr[i].weightA * A + 512) >> 10);
661 if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
662 s->decorr[i].samplesA[j] = T = S;
667 if(type == AV_SAMPLE_FMT_FLT){
668 *dstfl = wv_get_value_float(s, &crc_extra_bits, S);
669 dstfl += channel_stride;
670 }else if(type == AV_SAMPLE_FMT_S32){
671 *dst32 = wv_get_value_integer(s, &crc_extra_bits, S);
672 dst32 += channel_stride;
674 *dst16 = wv_get_value_integer(s, &crc_extra_bits, S);
675 dst16 += channel_stride;
678 }while(!last && count < s->max_samples);
683 s->samples_left -= count;
684 if(!s->samples_left){
685 wv_reset_saved_context(s);
687 av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
690 if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
691 av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
697 s->sc.bits_used = get_bits_count(&s->gb);
698 if(s->got_extra_bits){
699 s->extra_sc.crc = crc_extra_bits;
700 s->extra_sc.bits_used = get_bits_count(&s->gb_extra_bits);
706 static av_cold int wv_alloc_frame_context(WavpackContext *c)
709 if(c->fdec_num == WV_MAX_FRAME_DECODERS)
712 c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
713 if(!c->fdec[c->fdec_num])
716 c->fdec[c->fdec_num - 1]->avctx = c->avctx;
717 wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
722 static av_cold int wavpack_decode_init(AVCodecContext *avctx)
724 WavpackContext *s = avctx->priv_data;
727 if(avctx->bits_per_coded_sample <= 16)
728 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
730 avctx->sample_fmt = AV_SAMPLE_FMT_S32;
731 if(avctx->channels <= 2 && !avctx->channel_layout)
732 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
734 s->multichannel = avctx->channels > 2;
735 /* lavf demuxer does not provide extradata, Matroska stores 0x403
736 there, use this to detect decoding mode for multichannel */
738 if(s->multichannel && avctx->extradata && avctx->extradata_size == 2){
739 int ver = AV_RL16(avctx->extradata);
740 if(ver >= 0x402 && ver <= 0x410)
749 static av_cold int wavpack_decode_end(AVCodecContext *avctx)
751 WavpackContext *s = avctx->priv_data;
754 for(i = 0; i < s->fdec_num; i++)
755 av_freep(&s->fdec[i]);
761 static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
762 void *data, int *data_size,
763 const uint8_t *buf, int buf_size)
765 WavpackContext *wc = avctx->priv_data;
766 WavpackFrameContext *s;
767 void *samples = data;
769 int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0, got_float = 0;
771 const uint8_t* orig_buf = buf;
772 const uint8_t* buf_end = buf + buf_size;
773 int i, j, id, size, ssize, weights, t;
774 int bpp, chan, chmask;
781 if(block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0){
782 av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
786 s = wc->fdec[block_no];
788 av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n", block_no);
792 if(!s->samples_left){
793 memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
794 memset(s->ch, 0, sizeof(s->ch));
796 s->and = s->or = s->shift = 0;
797 s->got_extra_bits = 0;
801 s->samples = AV_RL32(buf); buf += 4;
807 s->samples = wc->samples;
809 s->frame_flags = AV_RL32(buf); buf += 4;
810 if(s->frame_flags&0x80){
812 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
813 } else if((s->frame_flags&0x03) <= 1){
815 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
818 avctx->sample_fmt = AV_SAMPLE_FMT_S32;
820 samples = (uint8_t*)samples + bpp * wc->ch_offset;
822 s->stereo = !(s->frame_flags & WV_MONO);
823 s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
824 s->joint = s->frame_flags & WV_JOINT_STEREO;
825 s->hybrid = s->frame_flags & WV_HYBRID_MODE;
826 s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
827 s->post_shift = 8 * (bpp-1-(s->frame_flags&0x03)) + ((s->frame_flags >> 13) & 0x1f);
828 s->CRC = AV_RL32(buf); buf += 4;
830 buf += 4; //skip block size;
832 wc->ch_offset += 1 + s->stereo;
834 s->max_samples = *data_size / (bpp * avctx->channels);
835 s->max_samples = FFMIN(s->max_samples, s->samples);
836 if(s->samples_left > 0){
837 s->max_samples = FFMIN(s->max_samples, s->samples_left);
841 // parse metadata blocks
842 while(buf < buf_end){
845 if(id & WP_IDF_LONG) {
846 size |= (*buf++) << 8;
847 size |= (*buf++) << 16;
849 size <<= 1; // size is specified in words
851 if(id & WP_IDF_ODD) size--;
853 av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
856 if(buf + ssize > buf_end){
857 av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
860 if(id & WP_IDF_IGNORE){
864 switch(id & WP_IDF_MASK){
867 if(s->terms > MAX_TERMS){
868 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
872 for(i = 0; i < s->terms; i++) {
873 s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
874 s->decorr[s->terms - i - 1].delta = *buf >> 5;
879 case WP_ID_DECWEIGHTS:
881 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
884 weights = size >> s->stereo_in;
885 if(weights > MAX_TERMS || weights > s->terms){
886 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
890 for(i = 0; i < weights; i++) {
891 t = (int8_t)(*buf++);
892 s->decorr[s->terms - i - 1].weightA = t << 3;
893 if(s->decorr[s->terms - i - 1].weightA > 0)
894 s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
896 t = (int8_t)(*buf++);
897 s->decorr[s->terms - i - 1].weightB = t << 3;
898 if(s->decorr[s->terms - i - 1].weightB > 0)
899 s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
904 case WP_ID_DECSAMPLES:
906 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
910 for(i = s->terms - 1; (i >= 0) && (t < size); i--) {
911 if(s->decorr[i].value > 8){
912 s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
913 s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2;
915 s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
916 s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2;
920 }else if(s->decorr[i].value < 0){
921 s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
922 s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
925 for(j = 0; j < s->decorr[i].value; j++){
926 s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;
928 s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;
931 t += s->decorr[i].value * 2 * (s->stereo_in + 1);
937 if(size != 6 * (s->stereo_in + 1)){
938 av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * (s->stereo_in + 1), size);
942 for(j = 0; j <= s->stereo_in; j++){
943 for(i = 0; i < 3; i++){
944 s->ch[j].median[i] = wp_exp2(AV_RL16(buf));
951 if(s->hybrid_bitrate){
952 for(i = 0; i <= s->stereo_in; i++){
953 s->ch[i].slow_level = wp_exp2(AV_RL16(buf));
958 for(i = 0; i < (s->stereo_in + 1); i++){
959 s->ch[i].bitrate_acc = AV_RL16(buf) << 16;
964 for(i = 0; i < (s->stereo_in + 1); i++){
965 s->ch[i].bitrate_delta = wp_exp2((int16_t)AV_RL16(buf));
969 for(i = 0; i < (s->stereo_in + 1); i++)
970 s->ch[i].bitrate_delta = 0;
974 case WP_ID_INT32INFO:
976 av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);
981 s->extra_bits = buf[0];
993 case WP_ID_FLOATINFO:
995 av_log(avctx, AV_LOG_ERROR, "Invalid FLOATINFO, size = %i\n", size);
999 s->float_flag = buf[0];
1000 s->float_shift = buf[1];
1001 s->float_max_exp = buf[2];
1006 s->sc.offset = buf - orig_buf;
1007 s->sc.size = size * 8;
1008 init_get_bits(&s->gb, buf, size * 8);
1009 s->data_size = size * 8;
1013 case WP_ID_EXTRABITS:
1015 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n", size);
1019 s->extra_sc.offset = buf - orig_buf;
1020 s->extra_sc.size = size * 8;
1021 init_get_bits(&s->gb_extra_bits, buf, size * 8);
1022 s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
1024 s->got_extra_bits = 1;
1026 case WP_ID_CHANINFO:
1028 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");
1037 chmask = AV_RL16(buf);
1040 chmask = AV_RL24(buf);
1043 chmask = AV_RL32(buf);
1046 chan |= (buf[1] & 0xF) << 8;
1047 chmask = AV_RL24(buf + 2);
1050 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);
1051 chan = avctx->channels;
1052 chmask = avctx->channel_layout;
1054 if(chan != avctx->channels){
1055 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, decoder believes it's %d channels\n",
1056 chan, avctx->channels);
1059 if(!avctx->channel_layout)
1060 avctx->channel_layout = chmask;
1066 if(id & WP_IDF_ODD) buf++;
1068 if(!s->samples_left){
1070 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
1074 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
1078 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
1082 av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
1085 if(s->hybrid && !got_hybrid){
1086 av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
1090 av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
1093 if(!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT){
1094 av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
1097 if(s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT){
1098 const int size = get_bits_left(&s->gb_extra_bits);
1099 const int wanted = s->samples * s->extra_bits << s->stereo_in;
1101 av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
1102 s->got_extra_bits = 0;
1105 s->samples_left = s->samples;
1107 init_get_bits(&s->gb, orig_buf + s->sc.offset, s->sc.size);
1108 skip_bits_long(&s->gb, s->sc.bits_used);
1109 if(s->got_extra_bits){
1110 init_get_bits(&s->gb_extra_bits, orig_buf + s->extra_sc.offset,
1112 skip_bits_long(&s->gb_extra_bits, s->extra_sc.bits_used);
1117 if(avctx->sample_fmt == AV_SAMPLE_FMT_S16)
1118 samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16);
1119 else if(avctx->sample_fmt == AV_SAMPLE_FMT_S32)
1120 samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);
1122 samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);
1125 const int channel_stride = avctx->channels;
1127 if(avctx->sample_fmt == AV_SAMPLE_FMT_S16)
1128 samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);
1129 else if(avctx->sample_fmt == AV_SAMPLE_FMT_S32)
1130 samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);
1132 samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);
1134 if(s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16){
1135 int16_t *dst = (int16_t*)samples + 1;
1136 int16_t *src = (int16_t*)samples;
1137 int cnt = samplecount;
1140 src += channel_stride;
1141 dst += channel_stride;
1143 }else if(s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32){
1144 int32_t *dst = (int32_t*)samples + 1;
1145 int32_t *src = (int32_t*)samples;
1146 int cnt = samplecount;
1149 src += channel_stride;
1150 dst += channel_stride;
1152 }else if(s->stereo){
1153 float *dst = (float*)samples + 1;
1154 float *src = (float*)samples;
1155 int cnt = samplecount;
1158 src += channel_stride;
1159 dst += channel_stride;
1164 wc->samples_left = s->samples_left;
1166 return samplecount * bpp;
1169 static int wavpack_decode_frame(AVCodecContext *avctx,
1170 void *data, int *data_size,
1173 WavpackContext *s = avctx->priv_data;
1174 const uint8_t *buf = avpkt->data;
1175 int buf_size = avpkt->size;
1177 int samplecount = 0;
1180 s->samples_left = 0;
1184 s->samples = AV_RL32(buf); buf += 4;
1186 while(buf_size > 0){
1187 if(!s->multichannel){
1188 frame_size = buf_size;
1191 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;
1193 if(buf_size < 12) //MKV files can have zero flags after last block
1195 frame_size = AV_RL32(buf + 8) + 12;
1198 if(frame_size < 0 || frame_size > buf_size){
1199 av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d vs. %d bytes left)\n",
1200 s->block, frame_size, buf_size);
1203 if((samplecount = wavpack_decode_block(avctx, s->block, data,
1204 data_size, buf, frame_size)) < 0)
1207 buf += frame_size; buf_size -= frame_size;
1209 *data_size = samplecount * avctx->channels;
1211 return s->samples_left > 0 ? 0 : avpkt->size;
1214 static void wavpack_decode_flush(AVCodecContext *avctx)
1216 WavpackContext *s = avctx->priv_data;
1219 for (i = 0; i < s->fdec_num; i++)
1220 wv_reset_saved_context(s->fdec[i]);
1223 AVCodec ff_wavpack_decoder = {
1225 .type = AVMEDIA_TYPE_AUDIO,
1226 .id = CODEC_ID_WAVPACK,
1227 .priv_data_size = sizeof(WavpackContext),
1228 .init = wavpack_decode_init,
1229 .close = wavpack_decode_end,
1230 .decode = wavpack_decode_frame,
1231 .flush = wavpack_decode_flush,
1232 .capabilities = CODEC_CAP_SUBFRAMES,
1233 .long_name = NULL_IF_CONFIG_SMALL("WavPack"),