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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

  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. #define WV_FLT_SHIFT_ONES 0x01

  41. #define WV_FLT_SHIFT_SAME 0x02

  42. #define WV_FLT_SHIFT_SENT 0x04

  43. #define WV_FLT_ZERO_SENT  0x08

  44. #define WV_FLT_ZERO_SIGN  0x10

  45. 

  46. enum WP_ID_Flags{

  47.     WP_IDF_MASK   = 0x1F,

  48.     WP_IDF_IGNORE = 0x20,

  49.     WP_IDF_ODD    = 0x40,

  50.     WP_IDF_LONG   = 0x80

  51. };

  52. 

  53. enum WP_ID{

  54.     WP_ID_DUMMY = 0,

  55.     WP_ID_ENCINFO,

  56.     WP_ID_DECTERMS,

  57.     WP_ID_DECWEIGHTS,

  58.     WP_ID_DECSAMPLES,

  59.     WP_ID_ENTROPY,

  60.     WP_ID_HYBRID,

  61.     WP_ID_SHAPING,

  62.     WP_ID_FLOATINFO,

  63.     WP_ID_INT32INFO,

  64.     WP_ID_DATA,

  65.     WP_ID_CORR,

  66.     WP_ID_EXTRABITS,

  67.     WP_ID_CHANINFO

  68. };

  69. 

  70. typedef struct SavedContext {

  71.     int offset;

  72.     int size;

  73.     int bits_used;

  74.     uint32_t crc;

  75. } SavedContext;

  76. 

  77. #define MAX_TERMS 16

  78. 

  79. typedef struct Decorr {

  80.     int delta;

  81.     int value;

  82.     int weightA;

  83.     int weightB;

  84.     int samplesA[8];

  85.     int samplesB[8];

  86. } Decorr;

  87. 

  88. typedef struct WvChannel {

  89.     int median[3];

  90.     int slow_level, error_limit;

  91.     int bitrate_acc, bitrate_delta;

  92. } WvChannel;

  93. 

  94. typedef struct WavpackContext {

  95.     AVCodecContext *avctx;

  96.     int frame_flags;

  97.     int stereo, stereo_in;

  98.     int joint;

  99.     uint32_t CRC;

  100.     GetBitContext gb;

  101.     int got_extra_bits;

  102.     uint32_t crc_extra_bits;

  103.     GetBitContext gb_extra_bits;

  104.     int data_size; // in bits

  105.     int samples;

  106.     int terms;

  107.     Decorr decorr[MAX_TERMS];

  108.     int zero, one, zeroes;

  109.     int extra_bits;

  110.     int and, or, shift;

  111.     int post_shift;

  112.     int hybrid, hybrid_bitrate;

  113.     int float_flag;

  114.     int float_shift;

  115.     int float_max_exp;

  116.     WvChannel ch[2];

  117.     int samples_left;

  118.     int max_samples;

  119.     int pos;

  120.     SavedContext sc, extra_sc;

  121. } WavpackContext;

  122. 

  123. // exponent table copied from WavPack source

  124. static const uint8_t wp_exp2_table [256] = {

  125.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  126.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  127.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  128.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  129.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  130.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  131.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  132.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  133.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  134.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  135.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  136.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  137.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  138.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  139.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  140.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  141. };

  142. 

  143. static const uint8_t wp_log2_table [] = {

  144.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  145.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  146.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  147.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  148.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  149.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  150.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  151.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  152.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  153.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  154.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  155.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  156.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  157.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  158.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  159.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  160. };

  161. 

  162. static av_always_inline int wp_exp2(int16_t val)

  163. {

  164.     int res, neg = 0;

  165. 

  166.     if(val < 0){

  167.         val = -val;

  168.         neg = 1;

  169.     }

  170. 

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

  172.     val >>= 8;

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

  174.     return neg ? -res : res;

  175. }

  176. 

  177. static av_always_inline int wp_log2(int32_t val)

  178. {

  179.     int bits;

  180. 

  181.     if(!val)

  182.         return 0;

  183.     if(val == 1)

  184.         return 256;

  185.     val += val >> 9;

  186.     bits = av_log2(val) + 1;

  187.     if(bits < 9)

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

  189.     else

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

  191. }

  192. 

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

  194. 

  195. // macros for manipulating median values

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

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

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

  199. 

  200. // macros for applying weight

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

  202.         if(samples && in){ \

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

  204.                 weight -= delta; \

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

  206.             }else{ \

  207.                 weight += delta; \

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

  209.             } \

  210.         }

  211. 

  212. 

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

  214. {

  215.     int p, e, res;

  216. 

  217.     if(k<1)return 0;

  218.     p = av_log2(k);

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

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

  221.     if(res >= e){

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

  223.     }

  224.     return res;

  225. }

  226. 

  227. static void update_error_limit(WavpackContext *ctx)

  228. {

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

  230. 

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

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

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

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

  235.     }

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

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

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

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

  240.             br[0] = 0;

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

  242.             br[0] <<= 1;

  243.             br[1] = 0;

  244.         }else{

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

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

  247.         }

  248.     }

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

  250.         if(ctx->hybrid_bitrate){

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

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

  253.             else

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

  255.         }else{

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

  257.         }

  258.     }

  259. }

  260. 

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

  262. {

  263.     int t, t2;

  264.     int sign, base, add, ret;

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

  266. 

  267.     *last = 0;

  268. 

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

  270.         if(ctx->zeroes){

  271.             ctx->zeroes--;

  272.             if(ctx->zeroes){

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

  274.                 return 0;

  275.             }

  276.         }else{

  277.             t = get_unary_0_33(gb);

  278.             if(t >= 2){

  279.                 if(get_bits_left(gb) < t-1)

  280.                     goto error;

  281.                 t = get_bits(gb, t - 1) | (1 << (t-1));

  282.             }else{

  283.                 if(get_bits_left(gb) < 0)

  284.                     goto error;

  285.             }

  286.             ctx->zeroes = t;

  287.             if(ctx->zeroes){

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

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

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

  291.                 return 0;

  292.             }

  293.         }

  294.     }

  295. 

  296.     if(ctx->zero){

  297.         t = 0;

  298.         ctx->zero = 0;

  299.     }else{

  300.         t = get_unary_0_33(gb);

  301.         if(get_bits_left(gb) < 0)

  302.             goto error;

  303.         if(t == 16) {

  304.             t2 = get_unary_0_33(gb);

  305.             if(t2 < 2){

  306.                 if(get_bits_left(gb) < 0)

  307.                     goto error;

  308.                 t += t2;

  309.             }else{

  310.                 if(get_bits_left(gb) < t2 - 1)

  311.                     goto error;

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

  313.             }

  314.         }

  315. 

  316.         if(ctx->one){

  317.             ctx->one = t&1;

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

  319.         }else{

  320.             ctx->one = t&1;

  321.             t >>= 1;

  322.         }

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

  324.     }

  325. 

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

  327.         update_error_limit(ctx);

  328. 

  329.     if(!t){

  330.         base = 0;

  331.         add = GET_MED(0) - 1;

  332.         DEC_MED(0);

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

  334.         base = GET_MED(0);

  335.         add = GET_MED(1) - 1;

  336.         INC_MED(0);

  337.         DEC_MED(1);

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

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

  340.         add = GET_MED(2) - 1;

  341.         INC_MED(0);

  342.         INC_MED(1);

  343.         DEC_MED(2);

  344.     }else{

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

  346.         add = GET_MED(2) - 1;

  347.         INC_MED(0);

  348.         INC_MED(1);

  349.         INC_MED(2);

  350.     }

  351.     if(!c->error_limit){

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

  353.         if (get_bits_left(gb) <= 0)

  354.             goto error;

  355.     }else{

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

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

  358.             if(get_bits_left(gb) <= 0)

  359.                 goto error;

  360.             if(get_bits1(gb)){

  361.                 add -= (mid - base);

  362.                 base = mid;

  363.             }else

  364.                 add = mid - base - 1;

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

  366.         }

  367.         ret = mid;

  368.     }

  369.     sign = get_bits1(gb);

  370.     if(ctx->hybrid_bitrate)

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

  372.     return sign ? ~ret : ret;

  373. 

  374. error:

  375.     *last = 1;

  376.     return 0;

  377. }

  378. 

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

  380. {

  381.     int bit;

  382. 

  383.     if(s->extra_bits){

  384.         S <<= s->extra_bits;

  385. 

  386.         if(s->got_extra_bits && get_bits_left(&s->gb_extra_bits) >= s->extra_bits){

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

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

  389.         }

  390.     }

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

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

  393. }

  394. 

  395. static float wv_get_value_float(WavpackContext *s, uint32_t *crc, int S)

  396. {

  397.     union {

  398.         float    f;

  399.         uint32_t u;

  400.     } value;

  401. 

  402.     int sign;

  403.     int exp = s->float_max_exp;

  404. 

  405.     if(s->got_extra_bits){

  406.         const int max_bits = 1 + 23 + 8 + 1;

  407.         const int left_bits = get_bits_left(&s->gb_extra_bits);

  408. 

  409.         if(left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)

  410.             return 0.0;

  411.     }

  412. 

  413.     if(S){

  414.         S <<= s->float_shift;

  415.         sign = S < 0;

  416.         if(sign)

  417.             S = -S;

  418.         if(S >= 0x1000000){

  419.             if(s->got_extra_bits && get_bits1(&s->gb_extra_bits)){

  420.                 S = get_bits(&s->gb_extra_bits, 23);

  421.             }else{

  422.                 S = 0;

  423.             }

  424.             exp = 255;

  425.         }else if(exp){

  426.             int shift = 23 - av_log2(S);

  427.             exp = s->float_max_exp;

  428.             if(exp <= shift){

  429.                 shift = --exp;

  430.             }

  431.             exp -= shift;

  432. 

  433.             if(shift){

  434.                 S <<= shift;

  435.                 if((s->float_flag & WV_FLT_SHIFT_ONES) ||

  436.                    (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) && get_bits1(&s->gb_extra_bits)) ){

  437.                     S |= (1 << shift) - 1;

  438.                 } else if(s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SENT)){

  439.                     S |= get_bits(&s->gb_extra_bits, shift);

  440.                 }

  441.             }

  442.         }else{

  443.             exp = s->float_max_exp;

  444.         }

  445.         S &= 0x7fffff;

  446.     }else{

  447.         sign = 0;

  448.         exp = 0;

  449.         if(s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)){

  450.             if(get_bits1(&s->gb_extra_bits)){

  451.                 S = get_bits(&s->gb_extra_bits, 23);

  452.                 if(s->float_max_exp >= 25)

  453.                     exp = get_bits(&s->gb_extra_bits, 8);

  454.                 sign = get_bits1(&s->gb_extra_bits);

  455.             }else{

  456.                 if(s->float_flag & WV_FLT_ZERO_SIGN)

  457.                     sign = get_bits1(&s->gb_extra_bits);

  458.             }

  459.         }

  460.     }

  461. 

  462.     *crc = *crc * 27 + S * 9 + exp * 3 + sign;

  463. 

  464.     value.u = (sign << 31) | (exp << 23) | S;

  465.     return value.f;

  466. }

  467. 

  468. static void wv_reset_saved_context(WavpackContext *s)

  469. {

  470.     s->pos = 0;

  471.     s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;

  472. }

  473. 

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

  475. {

  476.     int i, j, count = 0;

  477.     int last, t;

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

  479.     int pos = s->pos;

  480.     uint32_t crc = s->sc.crc;

  481.     uint32_t crc_extra_bits = s->extra_sc.crc;

  482.     int16_t *dst16 = dst;

  483.     int32_t *dst32 = dst;

  484.     float   *dstfl = dst;

  485. 

  486.     if(s->samples_left == s->samples)

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

  488.     do{

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

  490.         if(last) break;

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

  492.         if(last) break;

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

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

  495.             if(t > 0){

  496.                 if(t > 8){

  497.                     if(t & 1){

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

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

  500.                     }else{

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

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

  503.                     }

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

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

  506.                     j = 0;

  507.                 }else{

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

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

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

  511.                 }

  512.                 if(type != SAMPLE_FMT_S16){

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

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

  515.                 }else{

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

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

  518.                 }

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

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

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

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

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

  524.                 if(type != SAMPLE_FMT_S16)

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

  526.                 else

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

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

  529.                 L = L2;

  530.                 if(type != SAMPLE_FMT_S16)

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

  532.                 else

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

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

  535.                 R = R2;

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

  537.             }else{

  538.                 if(type != SAMPLE_FMT_S16)

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

  540.                 else

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

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

  543.                 R = R2;

  544. 

  545.                 if(t == -3){

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

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

  548.                 }

  549. 

  550.                 if(type != SAMPLE_FMT_S16)

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

  552.                 else

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

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

  555.                 L = L2;

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

  557.             }

  558.         }

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

  560.         if(s->joint)

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

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

  563. 

  564.         if(type == SAMPLE_FMT_FLT){

  565.             *dstfl++ = wv_get_value_float(s, &crc_extra_bits, L);

  566.             *dstfl++ = wv_get_value_float(s, &crc_extra_bits, R);

  567.         } else if(type == SAMPLE_FMT_S32){

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

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

  570.         } else {

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

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

  573.         }

  574.         count++;

  575.     }while(!last && count < s->max_samples);

  576. 

  577.     if (last)

  578.         s->samples_left = 0;

  579.     else

  580.         s->samples_left -= count;

  581.     if(!s->samples_left){

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

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

  584.             return -1;

  585.         }

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

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

  588.             return -1;

  589.         }

  590.         wv_reset_saved_context(s);

  591.     }else{

  592.         s->pos = pos;

  593.         s->sc.crc = crc;

  594.         s->sc.bits_used = get_bits_count(&s->gb);

  595.         if(s->got_extra_bits){

  596.             s->extra_sc.crc = crc_extra_bits;

  597.             s->extra_sc.bits_used = get_bits_count(&s->gb_extra_bits);

  598.         }

  599.     }

  600.     return count * 2;

  601. }

  602. 

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

  604. {

  605.     int i, j, count = 0;

  606.     int last, t;

  607.     int A, S, T;

  608.     int pos = s->pos;

  609.     uint32_t crc = s->sc.crc;

  610.     uint32_t crc_extra_bits = s->extra_sc.crc;

  611.     int16_t *dst16 = dst;

  612.     int32_t *dst32 = dst;

  613.     float   *dstfl = dst;

  614. 

  615.     if(s->samples_left == s->samples)

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

  617.     do{

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

  619.         S = 0;

  620.         if(last) break;

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

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

  623.             if(t > 8){

  624.                 if(t & 1)

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

  626.                 else

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

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

  629.                 j = 0;

  630.             }else{

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

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

  633.             }

  634.             if(type != SAMPLE_FMT_S16)

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

  636.             else

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

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

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

  640.         }

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

  642.         crc = crc * 3 + S;

  643. 

  644.         if(type == SAMPLE_FMT_FLT)

  645.             *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);

  646.         else if(type == SAMPLE_FMT_S32)

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

  648.         else

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

  650.         count++;

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

  652. 

  653.     if (last)

  654.         s->samples_left = 0;

  655.     else

  656.         s->samples_left -= count;

  657.     if(!s->samples_left){

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

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

  660.             return -1;

  661.         }

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

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

  664.             return -1;

  665.         }

  666.         wv_reset_saved_context(s);

  667.     }else{

  668.         s->pos = pos;

  669.         s->sc.crc = crc;

  670.         s->sc.bits_used = get_bits_count(&s->gb);

  671.         if(s->got_extra_bits){

  672.             s->extra_sc.crc = crc_extra_bits;

  673.             s->extra_sc.bits_used = get_bits_count(&s->gb_extra_bits);

  674.         }

  675.     }

  676.     return count;

  677. }

  678. 

  679. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  680. {

  681.     WavpackContext *s = avctx->priv_data;

  682. 

  683.     s->avctx = avctx;

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

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

  686.         avctx->sample_fmt = SAMPLE_FMT_S16;

  687.     else

  688.         avctx->sample_fmt = SAMPLE_FMT_S32;

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

  690. 

  691.     wv_reset_saved_context(s);

  692. 

  693.     return 0;

  694. }

  695. 

  696. static int wavpack_decode_frame(AVCodecContext *avctx,

  697.                             void *data, int *data_size,

  698.                             AVPacket *avpkt)

  699. {

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

  701.     int buf_size = avpkt->size;

  702.     WavpackContext *s = avctx->priv_data;

  703.     void *samples = data;

  704.     int samplecount;

  705.     int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0, got_float = 0;

  706.     int got_hybrid = 0;

  707.     const uint8_t* buf_end = buf + buf_size;

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

  709.     int bpp;

  710. 

  711.     if (buf_size == 0){

  712.         *data_size = 0;

  713.         return 0;

  714.     }

  715. 

  716.     if(!s->samples_left){

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

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

  719.         s->extra_bits = 0;

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

  721.         s->got_extra_bits = 0;

  722.     }

  723. 

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

  725.     if(!s->samples){

  726.         *data_size = 0;

  727.         return buf_size;

  728.     }

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

  730.     if(s->frame_flags&0x80){

  731.         bpp = sizeof(float);

  732.         avctx->sample_fmt = SAMPLE_FMT_FLT;

  733.     } else if((s->frame_flags&0x03) <= 1){

  734.         bpp = 2;

  735.         avctx->sample_fmt = SAMPLE_FMT_S16;

  736.     } else {

  737.         bpp = 4;

  738.         avctx->sample_fmt = SAMPLE_FMT_S32;

  739.     }

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

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

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

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

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

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

  746. 

  747.     s->max_samples = *data_size / (bpp * avctx->channels);

  748.     s->max_samples = FFMIN(s->max_samples, s->samples);

  749.     if(s->samples_left > 0){

  750.         s->max_samples = FFMIN(s->max_samples, s->samples_left);

  751.         buf = buf_end;

  752.     }

  753. 

  754.     // parse metadata blocks

  755.     while(buf < buf_end){

  756.         id = *buf++;

  757.         size = *buf++;

  758.         if(id & WP_IDF_LONG) {

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

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

  761.         }

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

  763.         ssize = size;

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

  765.         if(size < 0){

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

  767.             break;

  768.         }

  769.         if(buf + ssize > buf_end){

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

  771.             break;

  772.         }

  773.         if(id & WP_IDF_IGNORE){

  774.             buf += ssize;

  775.             continue;

  776.         }

  777.         switch(id & WP_IDF_MASK){

  778.         case WP_ID_DECTERMS:

  779.             if(size > MAX_TERMS){

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

  781.                 s->terms = 0;

  782.                 buf += ssize;

  783.                 continue;

  784.             }

  785.             s->terms = size;

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

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

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

  789.                 buf++;

  790.             }

  791.             got_terms = 1;

  792.             break;

  793.         case WP_ID_DECWEIGHTS:

  794.             if(!got_terms){

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

  796.                 continue;

  797.             }

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

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

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

  801.                 buf += ssize;

  802.                 continue;

  803.             }

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

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

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

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

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

  809.                 if(s->stereo_in){

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

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

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

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

  814.                 }

  815.             }

  816.             got_weights = 1;

  817.             break;

  818.         case WP_ID_DECSAMPLES:

  819.             if(!got_terms){

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

  821.                 continue;

  822.             }

  823.             t = 0;

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

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

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

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

  828.                     if(s->stereo_in){

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

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

  831.                         t += 4;

  832.                     }

  833.                     t += 4;

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

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

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

  837.                     t += 4;

  838.                 }else{

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

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

  841.                         if(s->stereo_in){

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

  843.                         }

  844.                     }

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

  846.                 }

  847.             }

  848.             got_samples = 1;

  849.             break;

  850.         case WP_ID_ENTROPY:

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

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

  853.                 buf += ssize;

  854.                 continue;

  855.             }

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

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

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

  859.                     buf += 2;

  860.                 }

  861.             }

  862.             got_entropy = 1;

  863.             break;

  864.         case WP_ID_HYBRID:

  865.             if(s->hybrid_bitrate){

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

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

  868.                     buf += 2;

  869.                     size -= 2;

  870.                 }

  871.             }

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

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

  874.                 buf += 2;

  875.                 size -= 2;

  876.             }

  877.             if(size > 0){

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

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

  880.                     buf += 2;

  881.                 }

  882.             }else{

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

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

  885.             }

  886.             got_hybrid = 1;

  887.             break;

  888.         case WP_ID_INT32INFO:

  889.             if(size != 4){

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

  891.                 buf += ssize;

  892.                 continue;

  893.             }

  894.             if(buf[0])

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

  896.             else if(buf[1])

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

  898.             else if(buf[2]){

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

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

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

  902.                 s->and = 1;

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

  904.             }

  905.             buf += 4;

  906.             break;

  907.         case WP_ID_FLOATINFO:

  908.             if(size != 4){

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

  910.                 buf += ssize;

  911.                 continue;

  912.             }

  913.             s->float_flag = buf[0];

  914.             s->float_shift = buf[1];

  915.             s->float_max_exp = buf[2];

  916.             buf += 4;

  917.             got_float = 1;

  918.             break;

  919.         case WP_ID_DATA:

  920.             s->sc.offset = buf - avpkt->data;

  921.             s->sc.size   = size * 8;

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

  923.             s->data_size = size * 8;

  924.             buf += size;

  925.             got_bs = 1;

  926.             break;

  927.         case WP_ID_EXTRABITS:

  928.             if(size <= 4){

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

  930.                 buf += size;

  931.                 continue;

  932.             }

  933.             s->extra_sc.offset = buf - avpkt->data;

  934.             s->extra_sc.size   = size * 8;

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

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

  937.             buf += size;

  938.             s->got_extra_bits = 1;

  939.             break;

  940.         default:

  941.             buf += size;

  942.         }

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

  944.     }

  945.     if(!s->samples_left){

  946.         if(!got_terms){

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

  948.             return -1;

  949.         }

  950.         if(!got_weights){

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

  952.             return -1;

  953.         }

  954.         if(!got_samples){

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

  956.             return -1;

  957.         }

  958.         if(!got_entropy){

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

  960.             return -1;

  961.         }

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

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

  964.             return -1;

  965.         }

  966.         if(!got_bs){

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

  968.             return -1;

  969.         }

  970.         if(!got_float && avctx->sample_fmt == SAMPLE_FMT_FLT){

  971.             av_log(avctx, AV_LOG_ERROR, "Float information not found\n");

  972.             return -1;

  973.         }

  974.         if(s->got_extra_bits && avctx->sample_fmt != SAMPLE_FMT_FLT){

  975.             const int size = get_bits_left(&s->gb_extra_bits);

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

  977.             if(size < wanted){

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

  979.                 s->got_extra_bits = 0;

  980.             }

  981.         }

  982.         s->samples_left = s->samples;

  983.     }else{

  984.         init_get_bits(&s->gb, avpkt->data + s->sc.offset, s->sc.size);

  985.         skip_bits_long(&s->gb, s->sc.bits_used);

  986.         if(s->got_extra_bits){

  987.             init_get_bits(&s->gb_extra_bits, avpkt->data + s->extra_sc.offset,

  988.                           s->extra_sc.size);

  989.             skip_bits_long(&s->gb_extra_bits, s->extra_sc.bits_used);

  990.         }

  991.     }

  992. 

  993.     if(s->stereo_in){

  994.         if(avctx->sample_fmt == SAMPLE_FMT_S16)

  995.             samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_S16);

  996.         else if(avctx->sample_fmt == SAMPLE_FMT_S32)

  997.             samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_S32);

  998.         else

  999.             samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_FLT);

  1000. 

  1001.         if (samplecount < 0)

  1002.             return -1;

  1003. 

  1004.     }else{

  1005.         if(avctx->sample_fmt == SAMPLE_FMT_S16)

  1006.             samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_S16);

  1007.         else if(avctx->sample_fmt == SAMPLE_FMT_S32)

  1008.             samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_S32);

  1009.         else

  1010.             samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_FLT);

  1011. 

  1012.         if (samplecount < 0)

  1013.             return -1;

  1014. 

  1015.         if(s->stereo && avctx->sample_fmt == SAMPLE_FMT_S16){

  1016.             int16_t *dst = (int16_t*)samples + samplecount * 2;

  1017.             int16_t *src = (int16_t*)samples + samplecount;

  1018.             int cnt = samplecount;

  1019.             while(cnt-- > 0){

  1020.                 *--dst = *--src;

  1021.                 *--dst = *src;

  1022.             }

  1023.             samplecount *= 2;

  1024.         }else if(s->stereo && avctx->sample_fmt == SAMPLE_FMT_S32){

  1025.             int32_t *dst = (int32_t*)samples + samplecount * 2;

  1026.             int32_t *src = (int32_t*)samples + samplecount;

  1027.             int cnt = samplecount;

  1028.             while(cnt-- > 0){

  1029.                 *--dst = *--src;

  1030.                 *--dst = *src;

  1031.             }

  1032.             samplecount *= 2;

  1033.         }else if(s->stereo){

  1034.             float *dst = (float*)samples + samplecount * 2;

  1035.             float *src = (float*)samples + samplecount;

  1036.             int cnt = samplecount;

  1037.             while(cnt-- > 0){

  1038.                 *--dst = *--src;

  1039.                 *--dst = *src;

  1040.             }

  1041.             samplecount *= 2;

  1042.         }

  1043.     }

  1044.     *data_size = samplecount * bpp;

  1045. 

  1046.     return s->samples_left > 0 ? 0 : buf_size;

  1047. }

  1048. 

  1049. AVCodec wavpack_decoder = {

  1050.     "wavpack",

  1051.     AVMEDIA_TYPE_AUDIO,

  1052.     CODEC_ID_WAVPACK,

  1053.     sizeof(WavpackContext),

  1054.     wavpack_decode_init,

  1055.     NULL,

  1056.     NULL,

  1057.     wavpack_decode_frame,

  1058.     .capabilities = CODEC_CAP_SUBFRAMES,

  1059.     .long_name = NULL_IF_CONFIG_SMALL("WavPack"),

  1060. };