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FFmpeg/libavcodec/wavpack.c

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  1. /*

  2.  * WavPack lossless audio decoder

  3.  * Copyright (c) 2006,2011 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 WavpackFrameContext {

  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. } WavpackFrameContext;

  122. 

  123. #define WV_MAX_FRAME_DECODERS 14

  124. 

  125. typedef struct WavpackContext {

  126.     AVCodecContext *avctx;

  127. 

  128.     WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];

  129.     int fdec_num;

  130. 

  131.     int multichannel;

  132.     int mkv_mode;

  133.     int block;

  134.     int samples;

  135.     int samples_left;

  136.     int ch_offset;

  137. } WavpackContext;

  138. 

  139. // exponent table copied from WavPack source

  140. static const uint8_t wp_exp2_table [256] = {

  141.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  142.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  143.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  144.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  145.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  146.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  147.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  148.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  149.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  150.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  151.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  152.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  153.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  154.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  155.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  156.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  157. };

  158. 

  159. static const uint8_t wp_log2_table [] = {

  160.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  161.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  162.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  163.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  164.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  165.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  166.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  167.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  168.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  169.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  170.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  171.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  172.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  173.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  174.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  175.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  176. };

  177. 

  178. static av_always_inline int wp_exp2(int16_t val)

  179. {

  180.     int res, neg = 0;

  181. 

  182.     if(val < 0){

  183.         val = -val;

  184.         neg = 1;

  185.     }

  186. 

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

  188.     val >>= 8;

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

  190.     return neg ? -res : res;

  191. }

  192. 

  193. static av_always_inline int wp_log2(int32_t val)

  194. {

  195.     int bits;

  196. 

  197.     if(!val)

  198.         return 0;

  199.     if(val == 1)

  200.         return 256;

  201.     val += val >> 9;

  202.     bits = av_log2(val) + 1;

  203.     if(bits < 9)

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

  205.     else

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

  207. }

  208. 

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

  210. 

  211. // macros for manipulating median values

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

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

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

  215. 

  216. // macros for applying weight

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

  218.         if(samples && in){ \

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

  220.                 weight -= delta; \

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

  222.             }else{ \

  223.                 weight += delta; \

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

  225.             } \

  226.         }

  227. 

  228. 

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

  230. {

  231.     int p, e, res;

  232. 

  233.     if(k<1)return 0;

  234.     p = av_log2(k);

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

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

  237.     if(res >= e){

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

  239.     }

  240.     return res;

  241. }

  242. 

  243. static void update_error_limit(WavpackFrameContext *ctx)

  244. {

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

  246. 

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

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

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

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

  251.     }

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

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

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

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

  256.             br[0] = 0;

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

  258.             br[0] <<= 1;

  259.             br[1] = 0;

  260.         }else{

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

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

  263.         }

  264.     }

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

  266.         if(ctx->hybrid_bitrate){

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

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

  269.             else

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

  271.         }else{

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

  273.         }

  274.     }

  275. }

  276. 

  277. static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb, int channel, int *last)

  278. {

  279.     int t, t2;

  280.     int sign, base, add, ret;

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

  282. 

  283.     *last = 0;

  284. 

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

  286.         if(ctx->zeroes){

  287.             ctx->zeroes--;

  288.             if(ctx->zeroes){

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

  290.                 return 0;

  291.             }

  292.         }else{

  293.             t = get_unary_0_33(gb);

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

  295.             ctx->zeroes = t;

  296.             if(ctx->zeroes){

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

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

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

  300.                 return 0;

  301.             }

  302.         }

  303.     }

  304. 

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

  306.         *last = 1;

  307.         return 0;

  308.     }

  309. 

  310.     if(ctx->zero){

  311.         t = 0;

  312.         ctx->zero = 0;

  313.     }else{

  314.         t = get_unary_0_33(gb);

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

  316.             *last = 1;

  317.             return 0;

  318.         }

  319.         if(t == 16) {

  320.             t2 = get_unary_0_33(gb);

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

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

  323.         }

  324. 

  325.         if(ctx->one){

  326.             ctx->one = t&1;

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

  328.         }else{

  329.             ctx->one = t&1;

  330.             t >>= 1;

  331.         }

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

  333.     }

  334. 

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

  336.         update_error_limit(ctx);

  337. 

  338.     if(!t){

  339.         base = 0;

  340.         add = GET_MED(0) - 1;

  341.         DEC_MED(0);

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

  343.         base = GET_MED(0);

  344.         add = GET_MED(1) - 1;

  345.         INC_MED(0);

  346.         DEC_MED(1);

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

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

  349.         add = GET_MED(2) - 1;

  350.         INC_MED(0);

  351.         INC_MED(1);

  352.         DEC_MED(2);

  353.     }else{

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

  355.         add = GET_MED(2) - 1;

  356.         INC_MED(0);

  357.         INC_MED(1);

  358.         INC_MED(2);

  359.     }

  360.     if(!c->error_limit){

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

  362.     }else{

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

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

  365.             if(get_bits1(gb)){

  366.                 add -= (mid - base);

  367.                 base = mid;

  368.             }else

  369.                 add = mid - base - 1;

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

  371.         }

  372.         ret = mid;

  373.     }

  374.     sign = get_bits1(gb);

  375.     if(ctx->hybrid_bitrate)

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

  377.     return sign ? ~ret : ret;

  378. }

  379. 

  380. static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc, int S)

  381. {

  382.     int bit;

  383. 

  384.     if(s->extra_bits){

  385.         S <<= s->extra_bits;

  386. 

  387.         if(s->got_extra_bits){

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

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

  390.         }

  391.     }

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

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

  394. }

  395. 

  396. static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)

  397. {

  398.     union {

  399.         float    f;

  400.         uint32_t u;

  401.     } value;

  402. 

  403.     int sign;

  404.     int exp = s->float_max_exp;

  405. 

  406.     if(s->got_extra_bits){

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

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

  409. 

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

  411.             return 0.0;

  412.     }

  413. 

  414.     if(S){

  415.         S <<= s->float_shift;

  416.         sign = S < 0;

  417.         if(sign)

  418.             S = -S;

  419.         if(S >= 0x1000000){

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

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

  422.             }else{

  423.                 S = 0;

  424.             }

  425.             exp = 255;

  426.         }else if(exp){

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

  428.             exp = s->float_max_exp;

  429.             if(exp <= shift){

  430.                 shift = --exp;

  431.             }

  432.             exp -= shift;

  433. 

  434.             if(shift){

  435.                 S <<= shift;

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

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

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

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

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

  441.                 }

  442.             }

  443.         }else{

  444.             exp = s->float_max_exp;

  445.         }

  446.         S &= 0x7fffff;

  447.     }else{

  448.         sign = 0;

  449.         exp = 0;

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

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

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

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

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

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

  456.             }else{

  457.                 if(s->float_flag & WV_FLT_ZERO_SIGN)

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

  459.             }

  460.         }

  461.     }

  462. 

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

  464. 

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

  466.     return value.f;

  467. }

  468. 

  469. static void wv_reset_saved_context(WavpackFrameContext *s)

  470. {

  471.     s->pos = 0;

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

  473. }

  474. 

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

  476. {

  477.     int i, j, count = 0;

  478.     int last, t;

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

  480.     int pos = s->pos;

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

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

  483.     int16_t *dst16 = dst;

  484.     int32_t *dst32 = dst;

  485.     float   *dstfl = dst;

  486.     const int channel_pad = s->avctx->channels - 2;

  487. 

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

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

  490.     do{

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

  492.         if(last) break;

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

  494.         if(last) break;

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

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

  497.             if(t > 0){

  498.                 if(t > 8){

  499.                     if(t & 1){

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

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

  502.                     }else{

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

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

  505.                     }

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

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

  508.                     j = 0;

  509.                 }else{

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

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

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

  513.                 }

  514.                 if(type != AV_SAMPLE_FMT_S16){

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

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

  517.                 }else{

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

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

  520.                 }

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

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

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

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

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

  526.                 if(type != AV_SAMPLE_FMT_S16)

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

  528.                 else

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

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

  531.                 L = L2;

  532.                 if(type != AV_SAMPLE_FMT_S16)

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

  534.                 else

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

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

  537.                 R = R2;

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

  539.             }else{

  540.                 if(type != AV_SAMPLE_FMT_S16)

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

  542.                 else

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

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

  545.                 R = R2;

  546. 

  547.                 if(t == -3){

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

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

  550.                 }

  551. 

  552.                 if(type != AV_SAMPLE_FMT_S16)

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

  554.                 else

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

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

  557.                 L = L2;

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

  559.             }

  560.         }

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

  562.         if(s->joint)

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

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

  565. 

  566.         if(type == AV_SAMPLE_FMT_FLT){

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

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

  569.             dstfl += channel_pad;

  570.         } else if(type == AV_SAMPLE_FMT_S32){

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

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

  573.             dst32 += channel_pad;

  574.         } else {

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

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

  577.             dst16 += channel_pad;

  578.         }

  579.         count++;

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

  581. 

  582.     s->samples_left -= count;

  583.     if(!s->samples_left){

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

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

  586.             return -1;

  587.         }

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

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

  590.             return -1;

  591.         }

  592.         wv_reset_saved_context(s);

  593.     }else{

  594.         s->pos = pos;

  595.         s->sc.crc = crc;

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

  597.         if(s->got_extra_bits){

  598.             s->extra_sc.crc = crc_extra_bits;

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

  600.         }

  601.     }

  602.     return count * 2;

  603. }

  604. 

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

  606. {

  607.     int i, j, count = 0;

  608.     int last, t;

  609.     int A, S, T;

  610.     int pos = s->pos;

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

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

  613.     int16_t *dst16 = dst;

  614.     int32_t *dst32 = dst;

  615.     float   *dstfl = dst;

  616.     const int channel_stride = s->avctx->channels;

  617. 

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

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

  620.     do{

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

  622.         S = 0;

  623.         if(last) break;

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

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

  626.             if(t > 8){

  627.                 if(t & 1)

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

  629.                 else

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

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

  632.                 j = 0;

  633.             }else{

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

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

  636.             }

  637.             if(type != AV_SAMPLE_FMT_S16)

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

  639.             else

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

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

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

  643.         }

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

  645.         crc = crc * 3 + S;

  646. 

  647.         if(type == AV_SAMPLE_FMT_FLT){

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

  649.             dstfl += channel_stride;

  650.         }else if(type == AV_SAMPLE_FMT_S32){

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

  652.             dst32 += channel_stride;

  653.         }else{

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

  655.             dst16 += channel_stride;

  656.         }

  657.         count++;

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

  659. 

  660.     s->samples_left -= count;

  661.     if(!s->samples_left){

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

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

  664.             return -1;

  665.         }

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

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

  668.             return -1;

  669.         }

  670.         wv_reset_saved_context(s);

  671.     }else{

  672.         s->pos = pos;

  673.         s->sc.crc = crc;

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

  675.         if(s->got_extra_bits){

  676.             s->extra_sc.crc = crc_extra_bits;

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

  678.         }

  679.     }

  680.     return count;

  681. }

  682. 

  683. static av_cold int wv_alloc_frame_context(WavpackContext *c)

  684. {

  685. 

  686.     if(c->fdec_num == WV_MAX_FRAME_DECODERS)

  687.         return -1;

  688. 

  689.     c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));

  690.     if(!c->fdec[c->fdec_num])

  691.         return -1;

  692.     c->fdec_num++;

  693.     c->fdec[c->fdec_num - 1]->avctx = c->avctx;

  694.     wv_reset_saved_context(c->fdec[c->fdec_num - 1]);

  695. 

  696.     return 0;

  697. }

  698. 

  699. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  700. {

  701.     WavpackContext *s = avctx->priv_data;

  702. 

  703.     s->avctx = avctx;

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

  705.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  706.     else

  707.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

  708.     if(avctx->channels <= 2 && !avctx->channel_layout)

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

  710. 

  711.     s->multichannel = avctx->channels > 2;

  712.     /* lavf demuxer does not provide extradata, Matroska stores 0x403

  713.        there, use this to detect decoding mode for multichannel */

  714.     s->mkv_mode = 0;

  715.     if(s->multichannel && avctx->extradata && avctx->extradata_size == 2){

  716.         int ver = AV_RL16(avctx->extradata);

  717.         if(ver >= 0x402 && ver <= 0x410)

  718.             s->mkv_mode = 1;

  719.     }

  720. 

  721.     s->fdec_num = 0;

  722. 

  723.     return 0;

  724. }

  725. 

  726. static av_cold int wavpack_decode_end(AVCodecContext *avctx)

  727. {

  728.     WavpackContext *s = avctx->priv_data;

  729.     int i;

  730. 

  731.     for(i = 0; i < s->fdec_num; i++)

  732.         av_freep(&s->fdec[i]);

  733.     s->fdec_num = 0;

  734. 

  735.     return 0;

  736. }

  737. 

  738. static int wavpack_decode_block(AVCodecContext *avctx, int block_no,

  739.                                 void *data, int *data_size,

  740.                                 const uint8_t *buf, int buf_size)

  741. {

  742.     WavpackContext *wc = avctx->priv_data;

  743.     WavpackFrameContext *s;

  744.     void *samples = data;

  745.     int samplecount;

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

  747.     int got_hybrid = 0;

  748.     const uint8_t* orig_buf = buf;

  749.     const uint8_t* buf_end = buf + buf_size;

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

  751.     int bpp, chan, chmask;

  752. 

  753.     if (buf_size == 0){

  754.         *data_size = 0;

  755.         return 0;

  756.     }

  757. 

  758.     if(block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0){

  759.         av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");

  760.         return -1;

  761.     }

  762. 

  763.     s = wc->fdec[block_no];

  764.     if(!s){

  765.         av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n", block_no);

  766.         return -1;

  767.     }

  768. 

  769.     if(!s->samples_left){

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

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

  772.         s->extra_bits = 0;

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

  774.         s->got_extra_bits = 0;

  775.     }

  776. 

  777.     if(!wc->mkv_mode){

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

  779.         if(!s->samples){

  780.             *data_size = 0;

  781.             return buf_size;

  782.         }

  783.     }else{

  784.         s->samples = wc->samples;

  785.     }

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

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

  788.         bpp = sizeof(float);

  789.         avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

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

  791.         bpp = 2;

  792.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  793.     } else {

  794.         bpp = 4;

  795.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

  796.     }

  797.     samples = (uint8_t*)samples + bpp * wc->ch_offset;

  798. 

  799.     s->stereo = !(s->frame_flags & WV_MONO);

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

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

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

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

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

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

  806.     if(wc->mkv_mode)

  807.         buf += 4; //skip block size;

  808. 

  809.     wc->ch_offset += 1 + s->stereo;

  810. 

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

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

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

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

  815.         buf = buf_end;

  816.     }

  817. 

  818.     // parse metadata blocks

  819.     while(buf < buf_end){

  820.         id = *buf++;

  821.         size = *buf++;

  822.         if(id & WP_IDF_LONG) {

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

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

  825.         }

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

  827.         ssize = size;

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

  829.         if(size < 0){

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

  831.             break;

  832.         }

  833.         if(buf + ssize > buf_end){

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

  835.             break;

  836.         }

  837.         if(id & WP_IDF_IGNORE){

  838.             buf += ssize;

  839.             continue;

  840.         }

  841.         switch(id & WP_IDF_MASK){

  842.         case WP_ID_DECTERMS:

  843.             s->terms = size;

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

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

  846.                 buf += ssize;

  847.                 continue;

  848.             }

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

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

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

  852.                 buf++;

  853.             }

  854.             got_terms = 1;

  855.             break;

  856.         case WP_ID_DECWEIGHTS:

  857.             if(!got_terms){

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

  859.                 continue;

  860.             }

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

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

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

  864.                 buf += ssize;

  865.                 continue;

  866.             }

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

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

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

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

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

  872.                 if(s->stereo_in){

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

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

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

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

  877.                 }

  878.             }

  879.             got_weights = 1;

  880.             break;

  881.         case WP_ID_DECSAMPLES:

  882.             if(!got_terms){

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

  884.                 continue;

  885.             }

  886.             t = 0;

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

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

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

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

  891.                     if(s->stereo_in){

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

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

  894.                         t += 4;

  895.                     }

  896.                     t += 4;

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

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

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

  900.                     t += 4;

  901.                 }else{

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

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

  904.                         if(s->stereo_in){

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

  906.                         }

  907.                     }

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

  909.                 }

  910.             }

  911.             got_samples = 1;

  912.             break;

  913.         case WP_ID_ENTROPY:

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

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

  916.                 buf += ssize;

  917.                 continue;

  918.             }

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

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

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

  922.                     buf += 2;

  923.                 }

  924.             }

  925.             got_entropy = 1;

  926.             break;

  927.         case WP_ID_HYBRID:

  928.             if(s->hybrid_bitrate){

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

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

  931.                     buf += 2;

  932.                     size -= 2;

  933.                 }

  934.             }

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

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

  937.                 buf += 2;

  938.                 size -= 2;

  939.             }

  940.             if(size > 0){

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

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

  943.                     buf += 2;

  944.                 }

  945.             }else{

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

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

  948.             }

  949.             got_hybrid = 1;

  950.             break;

  951.         case WP_ID_INT32INFO:

  952.             if(size != 4){

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

  954.                 buf += ssize;

  955.                 continue;

  956.             }

  957.             if(buf[0])

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

  959.             else if(buf[1])

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

  961.             else if(buf[2]){

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

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

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

  965.                 s->and = 1;

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

  967.             }

  968.             buf += 4;

  969.             break;

  970.         case WP_ID_FLOATINFO:

  971.             if(size != 4){

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

  973.                 buf += ssize;

  974.                 continue;

  975.             }

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

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

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

  979.             buf += 4;

  980.             got_float = 1;

  981.             break;

  982.         case WP_ID_DATA:

  983.             s->sc.offset = buf - orig_buf;

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

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

  986.             s->data_size = size * 8;

  987.             buf += size;

  988.             got_bs = 1;

  989.             break;

  990.         case WP_ID_EXTRABITS:

  991.             if(size <= 4){

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

  993.                 buf += size;

  994.                 continue;

  995.             }

  996.             s->extra_sc.offset = buf - orig_buf;

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

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

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

  1000.             buf += size;

  1001.             s->got_extra_bits = 1;

  1002.             break;

  1003.         case WP_ID_CHANINFO:

  1004.             if(size <= 1){

  1005.                 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");

  1006.                 return -1;

  1007.             }

  1008.             chan = *buf++;

  1009.             switch(size - 2){

  1010.             case 0:

  1011.                 chmask = *buf;

  1012.                 break;

  1013.             case 1:

  1014.                 chmask = AV_RL16(buf);

  1015.                 break;

  1016.             case 2:

  1017.                 chmask = AV_RL24(buf);

  1018.                 break;

  1019.             case 3:

  1020.                 chmask = AV_RL32(buf);

  1021.                 break;

  1022.             case 5:

  1023.                 chan |= (buf[1] & 0xF) << 8;

  1024.                 chmask = AV_RL24(buf + 2);

  1025.                 break;

  1026.             default:

  1027.                 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);

  1028.                 chan = avctx->channels;

  1029.                 chmask = avctx->channel_layout;

  1030.             }

  1031.             if(chan != avctx->channels){

  1032.                 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, decoder believes it's %d channels\n",

  1033.                        chan, avctx->channels);

  1034.                 return -1;

  1035.             }

  1036.             if(!avctx->channel_layout)

  1037.                 avctx->channel_layout = chmask;

  1038.             buf += size - 1;

  1039.             break;

  1040.         default:

  1041.             buf += size;

  1042.         }

  1043.         if(id & WP_IDF_ODD) buf++;

  1044.     }

  1045.     if(!s->samples_left){

  1046.         if(!got_terms){

  1047.             av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");

  1048.             return -1;

  1049.         }

  1050.         if(!got_weights){

  1051.             av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");

  1052.             return -1;

  1053.         }

  1054.         if(!got_samples){

  1055.             av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");

  1056.             return -1;

  1057.         }

  1058.         if(!got_entropy){

  1059.             av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");

  1060.             return -1;

  1061.         }

  1062.         if(s->hybrid && !got_hybrid){

  1063.             av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");

  1064.             return -1;

  1065.         }

  1066.         if(!got_bs){

  1067.             av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");

  1068.             return -1;

  1069.         }

  1070.         if(!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT){

  1071.             av_log(avctx, AV_LOG_ERROR, "Float information not found\n");

  1072.             return -1;

  1073.         }

  1074.         if(s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT){

  1075.             const int size = get_bits_left(&s->gb_extra_bits);

  1076.             const int wanted = s->samples * s->extra_bits << s->stereo_in;

  1077.             if(size < wanted){

  1078.                 av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");

  1079.                 s->got_extra_bits = 0;

  1080.             }

  1081.         }

  1082.         s->samples_left = s->samples;

  1083.     }else{

  1084.         init_get_bits(&s->gb, orig_buf + s->sc.offset, s->sc.size);

  1085.         skip_bits_long(&s->gb, s->sc.bits_used);

  1086.         if(s->got_extra_bits){

  1087.             init_get_bits(&s->gb_extra_bits, orig_buf + s->extra_sc.offset,

  1088.                           s->extra_sc.size);

  1089.             skip_bits_long(&s->gb_extra_bits, s->extra_sc.bits_used);

  1090.         }

  1091.     }

  1092. 

  1093.     if(s->stereo_in){

  1094.         if(avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1095.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1096.         else if(avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1097.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1098.         else

  1099.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1100.         samplecount >>= 1;

  1101.     }else{

  1102.         const int channel_stride = avctx->channels;

  1103. 

  1104.         if(avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1105.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1106.         else if(avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1107.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1108.         else

  1109.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1110. 

  1111.         if(s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16){

  1112.             int16_t *dst = (int16_t*)samples + 1;

  1113.             int16_t *src = (int16_t*)samples;

  1114.             int cnt = samplecount;

  1115.             while(cnt--){

  1116.                 *dst = *src;

  1117.                 src += channel_stride;

  1118.                 dst += channel_stride;

  1119.             }

  1120.         }else if(s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32){

  1121.             int32_t *dst = (int32_t*)samples + 1;

  1122.             int32_t *src = (int32_t*)samples;

  1123.             int cnt = samplecount;

  1124.             while(cnt--){

  1125.                 *dst = *src;

  1126.                 src += channel_stride;

  1127.                 dst += channel_stride;

  1128.             }

  1129.         }else if(s->stereo){

  1130.             float *dst = (float*)samples + 1;

  1131.             float *src = (float*)samples;

  1132.             int cnt = samplecount;

  1133.             while(cnt--){

  1134.                 *dst = *src;

  1135.                 src += channel_stride;

  1136.                 dst += channel_stride;

  1137.             }

  1138.         }

  1139.     }

  1140. 

  1141.     wc->samples_left = s->samples_left;

  1142. 

  1143.     return samplecount * bpp;

  1144. }

  1145. 

  1146. static int wavpack_decode_frame(AVCodecContext *avctx,

  1147.                             void *data, int *data_size,

  1148.                             AVPacket *avpkt)

  1149. {

  1150.     WavpackContext *s = avctx->priv_data;

  1151.     const uint8_t *buf = avpkt->data;

  1152.     int buf_size = avpkt->size;

  1153.     int frame_size;

  1154.     int samplecount = 0;

  1155. 

  1156.     s->block = 0;

  1157.     s->samples_left = 0;

  1158.     s->ch_offset = 0;

  1159. 

  1160.     if(s->mkv_mode){

  1161.         s->samples = AV_RL32(buf); buf += 4;

  1162.     }

  1163.     while(buf_size > 0){

  1164.         if(!s->multichannel){

  1165.             frame_size = buf_size;

  1166.         }else{

  1167.             if(!s->mkv_mode){

  1168.                 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;

  1169.             }else{

  1170.                 if(buf_size < 12) //MKV files can have zero flags after last block

  1171.                     break;

  1172.                 frame_size = AV_RL32(buf + 8) + 12;

  1173.             }

  1174.         }

  1175.         if(frame_size < 0 || frame_size > buf_size){

  1176.             av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d vs. %d bytes left)\n",

  1177.                    s->block, frame_size, buf_size);

  1178.             return -1;

  1179.         }

  1180.         if((samplecount = wavpack_decode_block(avctx, s->block, data,

  1181.                                                data_size, buf, frame_size)) < 0)

  1182.             return -1;

  1183.         s->block++;

  1184.         buf += frame_size; buf_size -= frame_size;

  1185.     }

  1186.     *data_size = samplecount * avctx->channels;

  1187. 

  1188.     return s->samples_left > 0 ? 0 : avpkt->size;

  1189. }

  1190. 

  1191. AVCodec wavpack_decoder = {

  1192.     "wavpack",

  1193.     AVMEDIA_TYPE_AUDIO,

  1194.     CODEC_ID_WAVPACK,

  1195.     sizeof(WavpackContext),

  1196.     wavpack_decode_init,

  1197.     NULL,

  1198.     wavpack_decode_end,

  1199.     wavpack_decode_frame,

  1200.     .capabilities = CODEC_CAP_SUBFRAMES,

  1201.     .long_name = NULL_IF_CONFIG_SMALL("WavPack"),

  1202. };