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FFmpeg/libavcodec/wavpack.c

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  1. /*

  2.  * WavPack lossless audio decoder

  3.  * Copyright (c) 2006 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg 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.

  11.  *

  12.  * FFmpeg 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.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. #define ALT_BITSTREAM_READER_LE

  22. #include "avcodec.h"

  23. #include "get_bits.h"

  24. #include "unary.h"

  25. 

  26. /**

  27.  * @file libavcodec/wavpack.c

  28.  * WavPack lossless audio decoder

  29.  */

  30. 

  31. #define WV_MONO         0x00000004

  32. #define WV_JOINT_STEREO 0x00000010

  33. #define WV_FALSE_STEREO 0x40000000

  34. 

  35. #define WV_HYBRID_MODE    0x00000008

  36. #define WV_HYBRID_SHAPE   0x00000008

  37. #define WV_HYBRID_BITRATE 0x00000200

  38. #define WV_HYBRID_BALANCE 0x00000400

  39. 

  40. enum WP_ID_Flags{

  41.     WP_IDF_MASK   = 0x1F,

  42.     WP_IDF_IGNORE = 0x20,

  43.     WP_IDF_ODD    = 0x40,

  44.     WP_IDF_LONG   = 0x80

  45. };

  46. 

  47. enum WP_ID{

  48.     WP_ID_DUMMY = 0,

  49.     WP_ID_ENCINFO,

  50.     WP_ID_DECTERMS,

  51.     WP_ID_DECWEIGHTS,

  52.     WP_ID_DECSAMPLES,

  53.     WP_ID_ENTROPY,

  54.     WP_ID_HYBRID,

  55.     WP_ID_SHAPING,

  56.     WP_ID_FLOATINFO,

  57.     WP_ID_INT32INFO,

  58.     WP_ID_DATA,

  59.     WP_ID_CORR,

  60.     WP_ID_EXTRABITS,

  61.     WP_ID_CHANINFO

  62. };

  63. 

  64. #define MAX_TERMS 16

  65. 

  66. typedef struct Decorr {

  67.     int delta;

  68.     int value;

  69.     int weightA;

  70.     int weightB;

  71.     int samplesA[8];

  72.     int samplesB[8];

  73. } Decorr;

  74. 

  75. typedef struct WvChannel {

  76.     int median[3];

  77.     int slow_level, error_limit;

  78.     int bitrate_acc, bitrate_delta;

  79. } WvChannel;

  80. 

  81. typedef struct WavpackContext {

  82.     AVCodecContext *avctx;

  83.     int frame_flags;

  84.     int stereo, stereo_in;

  85.     int joint;

  86.     uint32_t CRC;

  87.     GetBitContext gb;

  88.     int got_extra_bits;

  89.     uint32_t crc_extra_bits;

  90.     GetBitContext gb_extra_bits;

  91.     int data_size; // in bits

  92.     int samples;

  93.     int terms;

  94.     Decorr decorr[MAX_TERMS];

  95.     int zero, one, zeroes;

  96.     int extra_bits;

  97.     int and, or, shift;

  98.     int post_shift;

  99.     int hybrid, hybrid_bitrate;

  100.     WvChannel ch[2];

  101. } WavpackContext;

  102. 

  103. // exponent table copied from WavPack source

  104. static const uint8_t wp_exp2_table [256] = {

  105.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  106.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  107.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  108.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  109.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  110.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  111.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  112.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  113.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  114.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  115.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  116.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  117.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  118.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  119.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  120.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  121. };

  122. 

  123. static const uint8_t wp_log2_table [] = {

  124.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  125.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  126.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  127.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  128.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  129.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  130.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  131.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  132.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  133.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  134.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  135.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  136.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  137.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  138.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  139.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  140. };

  141. 

  142. static av_always_inline int wp_exp2(int16_t val)

  143. {

  144.     int res, neg = 0;

  145. 

  146.     if(val < 0){

  147.         val = -val;

  148.         neg = 1;

  149.     }

  150. 

  151.     res = wp_exp2_table[val & 0xFF] | 0x100;

  152.     val >>= 8;

  153.     res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));

  154.     return neg ? -res : res;

  155. }

  156. 

  157. static av_always_inline int wp_log2(int32_t val)

  158. {

  159.     int bits;

  160. 

  161.     if(!val)

  162.         return 0;

  163.     if(val == 1)

  164.         return 256;

  165.     val += val >> 9;

  166.     bits = av_log2(val) + 1;

  167.     if(bits < 9)

  168.         return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF];

  169.     else

  170.         return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF];

  171. }

  172. 

  173. #define LEVEL_DECAY(a)  ((a + 0x80) >> 8)

  174. 

  175. // macros for manipulating median values

  176. #define GET_MED(n) ((c->median[n] >> 4) + 1)

  177. #define DEC_MED(n) c->median[n] -= ((c->median[n] + (128>>n) - 2) / (128>>n)) * 2

  178. #define INC_MED(n) c->median[n] += ((c->median[n] + (128>>n)) / (128>>n)) * 5

  179. 

  180. // macros for applying weight

  181. #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \

  182.         if(samples && in){ \

  183.             if((samples ^ in) < 0){ \

  184.                 weight -= delta; \

  185.                 if(weight < -1024) weight = -1024; \

  186.             }else{ \

  187.                 weight += delta; \

  188.                 if(weight > 1024) weight = 1024; \

  189.             } \

  190.         }

  191. 

  192. 

  193. static av_always_inline int get_tail(GetBitContext *gb, int k)

  194. {

  195.     int p, e, res;

  196. 

  197.     if(k<1)return 0;

  198.     p = av_log2(k);

  199.     e = (1 << (p + 1)) - k - 1;

  200.     res = p ? get_bits(gb, p) : 0;

  201.     if(res >= e){

  202.         res = (res<<1) - e + get_bits1(gb);

  203.     }

  204.     return res;

  205. }

  206. 

  207. static void update_error_limit(WavpackContext *ctx)

  208. {

  209.     int i, br[2], sl[2];

  210. 

  211.     for(i = 0; i <= ctx->stereo_in; i++){

  212.         ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta;

  213.         br[i] = ctx->ch[i].bitrate_acc >> 16;

  214.         sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level);

  215.     }

  216.     if(ctx->stereo_in && ctx->hybrid_bitrate){

  217.         int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;

  218.         if(balance > br[0]){

  219.             br[1] = br[0] << 1;

  220.             br[0] = 0;

  221.         }else if(-balance > br[0]){

  222.             br[0] <<= 1;

  223.             br[1] = 0;

  224.         }else{

  225.             br[1] = br[0] + balance;

  226.             br[0] = br[0] - balance;

  227.         }

  228.     }

  229.     for(i = 0; i <= ctx->stereo_in; i++){

  230.         if(ctx->hybrid_bitrate){

  231.             if(sl[i] - br[i] > -0x100)

  232.                 ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);

  233.             else

  234.                 ctx->ch[i].error_limit = 0;

  235.         }else{

  236.             ctx->ch[i].error_limit = wp_exp2(br[i]);

  237.         }

  238.     }

  239. }

  240. 

  241. static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int channel, int *last)

  242. {

  243.     int t, t2;

  244.     int sign, base, add, ret;

  245.     WvChannel *c = &ctx->ch[channel];

  246. 

  247.     *last = 0;

  248. 

  249.     if((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) && !ctx->zero && !ctx->one){

  250.         if(ctx->zeroes){

  251.             ctx->zeroes--;

  252.             if(ctx->zeroes){

  253.                 c->slow_level -= LEVEL_DECAY(c->slow_level);

  254.                 return 0;

  255.             }

  256.         }else{

  257.             t = get_unary_0_33(gb);

  258.             if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1));

  259.             ctx->zeroes = t;

  260.             if(ctx->zeroes){

  261.                 memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median));

  262.                 memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median));

  263.                 c->slow_level -= LEVEL_DECAY(c->slow_level);

  264.                 return 0;

  265.             }

  266.         }

  267.     }

  268. 

  269.     if(get_bits_count(gb) >= ctx->data_size){

  270.         *last = 1;

  271.         return 0;

  272.     }

  273. 

  274.     if(ctx->zero){

  275.         t = 0;

  276.         ctx->zero = 0;

  277.     }else{

  278.         t = get_unary_0_33(gb);

  279.         if(get_bits_count(gb) >= ctx->data_size){

  280.             *last = 1;

  281.             return 0;

  282.         }

  283.         if(t == 16) {

  284.             t2 = get_unary_0_33(gb);

  285.             if(t2 < 2) t += t2;

  286.             else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));

  287.         }

  288. 

  289.         if(ctx->one){

  290.             ctx->one = t&1;

  291.             t = (t>>1) + 1;

  292.         }else{

  293.             ctx->one = t&1;

  294.             t >>= 1;

  295.         }

  296.         ctx->zero = !ctx->one;

  297.     }

  298. 

  299.     if(ctx->hybrid && !channel)

  300.         update_error_limit(ctx);

  301. 

  302.     if(!t){

  303.         base = 0;

  304.         add = GET_MED(0) - 1;

  305.         DEC_MED(0);

  306.     }else if(t == 1){

  307.         base = GET_MED(0);

  308.         add = GET_MED(1) - 1;

  309.         INC_MED(0);

  310.         DEC_MED(1);

  311.     }else if(t == 2){

  312.         base = GET_MED(0) + GET_MED(1);

  313.         add = GET_MED(2) - 1;

  314.         INC_MED(0);

  315.         INC_MED(1);

  316.         DEC_MED(2);

  317.     }else{

  318.         base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);

  319.         add = GET_MED(2) - 1;

  320.         INC_MED(0);

  321.         INC_MED(1);

  322.         INC_MED(2);

  323.     }

  324.     if(!c->error_limit){

  325.         ret = base + get_tail(gb, add);

  326.     }else{

  327.         int mid = (base*2 + add + 1) >> 1;

  328.         while(add > c->error_limit){

  329.             if(get_bits1(gb)){

  330.                 add -= (mid - base);

  331.                 base = mid;

  332.             }else

  333.                 add = mid - base - 1;

  334.             mid = (base*2 + add + 1) >> 1;

  335.         }

  336.         ret = mid;

  337.     }

  338.     sign = get_bits1(gb);

  339.     if(ctx->hybrid_bitrate)

  340.         c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level);

  341.     return sign ? ~ret : ret;

  342. }

  343. 

  344. static inline int wv_get_value_integer(WavpackContext *s, uint32_t *crc, int S)

  345. {

  346.     int bit;

  347. 

  348.     if(s->extra_bits){

  349.         S <<= s->extra_bits;

  350. 

  351.         if(s->got_extra_bits){

  352.             S |= get_bits(&s->gb_extra_bits, s->extra_bits);

  353.             *crc = *crc * 9 + (S&0xffff) * 3 + ((unsigned)S>>16);

  354.         }

  355.     }

  356.     bit = (S & s->and) | s->or;

  357.     return (((S + bit) << s->shift) - bit) << s->post_shift;

  358. }

  359. 

  360. static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *dst, const int hires)

  361. {

  362.     int i, j, count = 0;

  363.     int last, t;

  364.     int A, B, L, L2, R, R2;

  365.     int pos = 0;

  366.     uint32_t crc = 0xFFFFFFFF;

  367.     uint32_t crc_extra_bits = 0xFFFFFFFF;

  368.     int16_t *dst16 = dst;

  369.     int32_t *dst32 = dst;

  370. 

  371.     s->one = s->zero = s->zeroes = 0;

  372.     do{

  373.         L = wv_get_value(s, gb, 0, &last);

  374.         if(last) break;

  375.         R = wv_get_value(s, gb, 1, &last);

  376.         if(last) break;

  377.         for(i = 0; i < s->terms; i++){

  378.             t = s->decorr[i].value;

  379.             if(t > 0){

  380.                 if(t > 8){

  381.                     if(t & 1){

  382.                         A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];

  383.                         B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];

  384.                     }else{

  385.                         A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;

  386.                         B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;

  387.                     }

  388.                     s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];

  389.                     s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];

  390.                     j = 0;

  391.                 }else{

  392.                     A = s->decorr[i].samplesA[pos];

  393.                     B = s->decorr[i].samplesB[pos];

  394.                     j = (pos + t) & 7;

  395.                 }

  396.                 if(hires){

  397.                     L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);

  398.                     R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);

  399.                 }else{

  400.                     L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);

  401.                     R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);

  402.                 }

  403.                 if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;

  404.                 if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;

  405.                 s->decorr[i].samplesA[j] = L = L2;

  406.                 s->decorr[i].samplesB[j] = R = R2;

  407.             }else if(t == -1){

  408.                 if(hires)

  409.                     L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);

  410.                 else

  411.                     L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);

  412.                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);

  413.                 L = L2;

  414.                 if(hires)

  415.                     R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);

  416.                 else

  417.                     R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);

  418.                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);

  419.                 R = R2;

  420.                 s->decorr[i].samplesA[0] = R;

  421.             }else{

  422.                 if(hires)

  423.                     R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);

  424.                 else

  425.                     R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);

  426.                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);

  427.                 R = R2;

  428. 

  429.                 if(t == -3){

  430.                     R2 = s->decorr[i].samplesA[0];

  431.                     s->decorr[i].samplesA[0] = R;

  432.                 }

  433. 

  434.                 if(hires)

  435.                     L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);

  436.                 else

  437.                     L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);

  438.                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);

  439.                 L = L2;

  440.                 s->decorr[i].samplesB[0] = L;

  441.             }

  442.         }

  443.         pos = (pos + 1) & 7;

  444.         if(s->joint)

  445.             L += (R -= (L >> 1));

  446.         crc = (crc * 3 + L) * 3 + R;

  447. 

  448.         if(hires){

  449.             *dst32++ = wv_get_value_integer(s, &crc_extra_bits, L);

  450.             *dst32++ = wv_get_value_integer(s, &crc_extra_bits, R);

  451.         } else {

  452.             *dst16++ = wv_get_value_integer(s, &crc_extra_bits, L);

  453.             *dst16++ = wv_get_value_integer(s, &crc_extra_bits, R);

  454.         }

  455.         count++;

  456.     }while(!last && count < s->samples);

  457. 

  458.     if(crc != s->CRC){

  459.         av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");

  460.         return -1;

  461.     }

  462.     if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){

  463.         av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");

  464.         return -1;

  465.     }

  466.     return count * 2;

  467. }

  468. 

  469. static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst, const int hires)

  470. {

  471.     int i, j, count = 0;

  472.     int last, t;

  473.     int A, S, T;

  474.     int pos = 0;

  475.     uint32_t crc = 0xFFFFFFFF;

  476.     uint32_t crc_extra_bits = 0xFFFFFFFF;

  477.     int16_t *dst16 = dst;

  478.     int32_t *dst32 = dst;

  479. 

  480.     s->one = s->zero = s->zeroes = 0;

  481.     do{

  482.         T = wv_get_value(s, gb, 0, &last);

  483.         S = 0;

  484.         if(last) break;

  485.         for(i = 0; i < s->terms; i++){

  486.             t = s->decorr[i].value;

  487.             if(t > 8){

  488.                 if(t & 1)

  489.                     A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];

  490.                 else

  491.                     A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;

  492.                 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];

  493.                 j = 0;

  494.             }else{

  495.                 A = s->decorr[i].samplesA[pos];

  496.                 j = (pos + t) & 7;

  497.             }

  498.             if(hires)

  499.                 S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);

  500.             else

  501.                 S = T + ((s->decorr[i].weightA * A + 512) >> 10);

  502.             if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;

  503.             s->decorr[i].samplesA[j] = T = S;

  504.         }

  505.         pos = (pos + 1) & 7;

  506.         crc = crc * 3 + S;

  507. 

  508.         if(hires)

  509.             *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);

  510.         else

  511.             *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);

  512.         count++;

  513.     }while(!last && count < s->samples);

  514. 

  515.     if(crc != s->CRC){

  516.         av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");

  517.         return -1;

  518.     }

  519.     if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){

  520.         av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");

  521.         return -1;

  522.     }

  523.     return count;

  524. }

  525. 

  526. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  527. {

  528.     WavpackContext *s = avctx->priv_data;

  529. 

  530.     s->avctx = avctx;

  531.     s->stereo = (avctx->channels == 2);

  532.     if(avctx->bits_per_coded_sample <= 16)

  533.         avctx->sample_fmt = SAMPLE_FMT_S16;

  534.     else

  535.         avctx->sample_fmt = SAMPLE_FMT_S32;

  536.     avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;

  537. 

  538.     return 0;

  539. }

  540. 

  541. static int wavpack_decode_frame(AVCodecContext *avctx,

  542.                             void *data, int *data_size,

  543.                             AVPacket *avpkt)

  544. {

  545.     const uint8_t *buf = avpkt->data;

  546.     int buf_size = avpkt->size;

  547.     WavpackContext *s = avctx->priv_data;

  548.     void *samples = data;

  549.     int samplecount;

  550.     int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;

  551.     int got_hybrid = 0;

  552.     const uint8_t* buf_end = buf + buf_size;

  553.     int i, j, id, size, ssize, weights, t;

  554.     int bpp;

  555. 

  556.     if (buf_size == 0){

  557.         *data_size = 0;

  558.         return 0;

  559.     }

  560. 

  561.     memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));

  562.     memset(s->ch, 0, sizeof(s->ch));

  563.     s->extra_bits = 0;

  564.     s->and = s->or = s->shift = 0;

  565.     s->got_extra_bits = 0;

  566. 

  567.     s->samples = AV_RL32(buf); buf += 4;

  568.     if(!s->samples){

  569.         *data_size = 0;

  570.         return buf_size;

  571.     }

  572.     s->frame_flags = AV_RL32(buf); buf += 4;

  573.     if((s->frame_flags&0x03) <= 1){

  574.         bpp = 2;

  575.         avctx->sample_fmt = SAMPLE_FMT_S16;

  576.     } else {

  577.         bpp = 4;

  578.         avctx->sample_fmt = SAMPLE_FMT_S32;

  579.     }

  580.     s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;

  581.     s->joint = s->frame_flags & WV_JOINT_STEREO;

  582.     s->hybrid = s->frame_flags & WV_HYBRID_MODE;

  583.     s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;

  584.     s->post_shift = 8 * (bpp-1-(s->frame_flags&0x03)) + ((s->frame_flags >> 13) & 0x1f);

  585.     s->CRC = AV_RL32(buf); buf += 4;

  586. 

  587.     /* should not happen but who knows */

  588.     if(s->samples * bpp * avctx->channels > *data_size){

  589.         av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");

  590.         return -1;

  591.     }

  592. 

  593.     // parse metadata blocks

  594.     while(buf < buf_end){

  595.         id = *buf++;

  596.         size = *buf++;

  597.         if(id & WP_IDF_LONG) {

  598.             size |= (*buf++) << 8;

  599.             size |= (*buf++) << 16;

  600.         }

  601.         size <<= 1; // size is specified in words

  602.         ssize = size;

  603.         if(id & WP_IDF_ODD) size--;

  604.         if(size < 0){

  605.             av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);

  606.             break;

  607.         }

  608.         if(buf + ssize > buf_end){

  609.             av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);

  610.             break;

  611.         }

  612.         if(id & WP_IDF_IGNORE){

  613.             buf += ssize;

  614.             continue;

  615.         }

  616.         switch(id & WP_IDF_MASK){

  617.         case WP_ID_DECTERMS:

  618.             s->terms = size;

  619.             if(s->terms > MAX_TERMS){

  620.                 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");

  621.                 buf += ssize;

  622.                 continue;

  623.             }

  624.             for(i = 0; i < s->terms; i++) {

  625.                 s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;

  626.                 s->decorr[s->terms - i - 1].delta = *buf >> 5;

  627.                 buf++;

  628.             }

  629.             got_terms = 1;

  630.             break;

  631.         case WP_ID_DECWEIGHTS:

  632.             if(!got_terms){

  633.                 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");

  634.                 continue;

  635.             }

  636.             weights = size >> s->stereo_in;

  637.             if(weights > MAX_TERMS || weights > s->terms){

  638.                 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");

  639.                 buf += ssize;

  640.                 continue;

  641.             }

  642.             for(i = 0; i < weights; i++) {

  643.                 t = (int8_t)(*buf++);

  644.                 s->decorr[s->terms - i - 1].weightA = t << 3;

  645.                 if(s->decorr[s->terms - i - 1].weightA > 0)

  646.                     s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;

  647.                 if(s->stereo_in){

  648.                     t = (int8_t)(*buf++);

  649.                     s->decorr[s->terms - i - 1].weightB = t << 3;

  650.                     if(s->decorr[s->terms - i - 1].weightB > 0)

  651.                         s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;

  652.                 }

  653.             }

  654.             got_weights = 1;

  655.             break;

  656.         case WP_ID_DECSAMPLES:

  657.             if(!got_terms){

  658.                 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");

  659.                 continue;

  660.             }

  661.             t = 0;

  662.             for(i = s->terms - 1; (i >= 0) && (t < size); i--) {

  663.                 if(s->decorr[i].value > 8){

  664.                     s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;

  665.                     s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2;

  666.                     if(s->stereo_in){

  667.                         s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;

  668.                         s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2;

  669.                         t += 4;

  670.                     }

  671.                     t += 4;

  672.                 }else if(s->decorr[i].value < 0){

  673.                     s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;

  674.                     s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;

  675.                     t += 4;

  676.                 }else{

  677.                     for(j = 0; j < s->decorr[i].value; j++){

  678.                         s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;

  679.                         if(s->stereo_in){

  680.                             s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;

  681.                         }

  682.                     }

  683.                     t += s->decorr[i].value * 2 * (s->stereo_in + 1);

  684.                 }

  685.             }

  686.             got_samples = 1;

  687.             break;

  688.         case WP_ID_ENTROPY:

  689.             if(size != 6 * (s->stereo_in + 1)){

  690.                 av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * (s->stereo_in + 1), size);

  691.                 buf += ssize;

  692.                 continue;

  693.             }

  694.             for(j = 0; j <= s->stereo_in; j++){

  695.                 for(i = 0; i < 3; i++){

  696.                     s->ch[j].median[i] = wp_exp2(AV_RL16(buf));

  697.                     buf += 2;

  698.                 }

  699.             }

  700.             got_entropy = 1;

  701.             break;

  702.         case WP_ID_HYBRID:

  703.             if(s->hybrid_bitrate){

  704.                 for(i = 0; i <= s->stereo_in; i++){

  705.                     s->ch[i].slow_level = wp_exp2(AV_RL16(buf));

  706.                     buf += 2;

  707.                     size -= 2;

  708.                 }

  709.             }

  710.             for(i = 0; i < (s->stereo_in + 1); i++){

  711.                 s->ch[i].bitrate_acc = AV_RL16(buf) << 16;

  712.                 buf += 2;

  713.                 size -= 2;

  714.             }

  715.             if(size > 0){

  716.                 for(i = 0; i < (s->stereo_in + 1); i++){

  717.                     s->ch[i].bitrate_delta = wp_exp2((int16_t)AV_RL16(buf));

  718.                     buf += 2;

  719.                 }

  720.             }else{

  721.                 for(i = 0; i < (s->stereo_in + 1); i++)

  722.                     s->ch[i].bitrate_delta = 0;

  723.             }

  724.             got_hybrid = 1;

  725.             break;

  726.         case WP_ID_INT32INFO:

  727.             if(size != 4){

  728.                 av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);

  729.                 buf += ssize;

  730.                 continue;

  731.             }

  732.             if(buf[0])

  733.                 s->extra_bits = buf[0];

  734.             else if(buf[1])

  735.                 s->shift = buf[1];

  736.             else if(buf[2]){

  737.                 s->and = s->or = 1;

  738.                 s->shift = buf[2];

  739.             }else if(buf[3]){

  740.                 s->and = 1;

  741.                 s->shift = buf[3];

  742.             }

  743.             buf += 4;

  744.             break;

  745.         case WP_ID_DATA:

  746.             init_get_bits(&s->gb, buf, size * 8);

  747.             s->data_size = size * 8;

  748.             buf += size;

  749.             got_bs = 1;

  750.             break;

  751.         case WP_ID_EXTRABITS:

  752.             if(size <= 4){

  753.                 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n", size);

  754.                 buf += size;

  755.                 continue;

  756.             }

  757.             init_get_bits(&s->gb_extra_bits, buf, size * 8);

  758.             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);

  759.             buf += size;

  760.             s->got_extra_bits = 1;

  761.             break;

  762.         default:

  763.             buf += size;

  764.         }

  765.         if(id & WP_IDF_ODD) buf++;

  766.     }

  767.     if(!got_terms){

  768.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");

  769.         return -1;

  770.     }

  771.     if(!got_weights){

  772.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");

  773.         return -1;

  774.     }

  775.     if(!got_samples){

  776.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");

  777.         return -1;

  778.     }

  779.     if(!got_entropy){

  780.         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");

  781.         return -1;

  782.     }

  783.     if(s->hybrid && !got_hybrid){

  784.         av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");

  785.         return -1;

  786.     }

  787.     if(!got_bs){

  788.         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");

  789.         return -1;

  790.     }

  791.     if(s->got_extra_bits){

  792.         const int size = s->gb_extra_bits.size_in_bits - get_bits_count(&s->gb_extra_bits);

  793.         const int wanted = s->samples * s->extra_bits << s->stereo_in;

  794.         if(size < wanted){

  795.             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");

  796.             s->got_extra_bits = 0;

  797.         }

  798.     }

  799. 

  800.     if(s->stereo_in){

  801.         if(bpp == 2)

  802.             samplecount = wv_unpack_stereo(s, &s->gb, samples, 0);

  803.         else

  804.             samplecount = wv_unpack_stereo(s, &s->gb, samples, 1);

  805.     }else{

  806.         if(bpp == 2)

  807.             samplecount = wv_unpack_mono(s, &s->gb, samples, 0);

  808.         else

  809.             samplecount = wv_unpack_mono(s, &s->gb, samples, 1);

  810.         if(s->stereo && bpp == 2){

  811.             int16_t *dst = (int16_t*)samples + samplecount * 2;

  812.             int16_t *src = (int16_t*)samples + samplecount;

  813.             int cnt = samplecount;

  814.             while(cnt--){

  815.                 *--dst = *--src;

  816.                 *--dst = *src;

  817.             }

  818.             samplecount *= 2;

  819.         }else if(s->stereo){ //32-bit output

  820.             int32_t *dst = (int32_t*)samples + samplecount * 2;

  821.             int32_t *src = (int32_t*)samples + samplecount;

  822.             int cnt = samplecount;

  823.             while(cnt--){

  824.                 *--dst = *--src;

  825.                 *--dst = *src;

  826.             }

  827.             samplecount *= 2;

  828.         }

  829.     }

  830.     *data_size = samplecount * bpp;

  831. 

  832.     return buf_size;

  833. }

  834. 

  835. AVCodec wavpack_decoder = {

  836.     "wavpack",

  837.     CODEC_TYPE_AUDIO,

  838.     CODEC_ID_WAVPACK,

  839.     sizeof(WavpackContext),

  840.     wavpack_decode_init,

  841.     NULL,

  842.     NULL,

  843.     wavpack_decode_frame,

  844.     .long_name = NULL_IF_CONFIG_SMALL("WavPack"),

  845. };