falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
19504 Commits
32 Branches
720MB
Tree: f0a75e66b9
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'f0a75e66b9'
${ noResults }
FFmpeg/libavcodec/wavpack.c

798 lines
27KB
Raw Blame History 

  1. /*

  2.  * WavPack lossless audio decoder

  3.  * Copyright (c) 2006 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. #define ALT_BITSTREAM_READER_LE

  22. #include "avcodec.h"

  23. #include "get_bits.h"

  24. #include "unary.h"

  25. 

  26. /**

  27.  * @file libavcodec/wavpack.c

  28.  * WavPack lossless audio decoder

  29.  */

  30. 

  31. #define WV_MONO         0x00000004

  32. #define WV_JOINT_STEREO 0x00000010

  33. #define WV_FALSE_STEREO 0x40000000

  34. 

  35. #define WV_HYBRID_MODE    0x00000008

  36. #define WV_HYBRID_SHAPE   0x00000008

  37. #define WV_HYBRID_BITRATE 0x00000200

  38. #define WV_HYBRID_BALANCE 0x00000400

  39. 

  40. enum WP_ID_Flags{

  41.     WP_IDF_MASK   = 0x1F,

  42.     WP_IDF_IGNORE = 0x20,

  43.     WP_IDF_ODD    = 0x40,

  44.     WP_IDF_LONG   = 0x80

  45. };

  46. 

  47. enum WP_ID{

  48.     WP_ID_DUMMY = 0,

  49.     WP_ID_ENCINFO,

  50.     WP_ID_DECTERMS,

  51.     WP_ID_DECWEIGHTS,

  52.     WP_ID_DECSAMPLES,

  53.     WP_ID_ENTROPY,

  54.     WP_ID_HYBRID,

  55.     WP_ID_SHAPING,

  56.     WP_ID_FLOATINFO,

  57.     WP_ID_INT32INFO,

  58.     WP_ID_DATA,

  59.     WP_ID_CORR,

  60.     WP_ID_FLT,

  61.     WP_ID_CHANINFO

  62. };

  63. 

  64. #define MAX_TERMS 16

  65. 

  66. typedef struct Decorr {

  67.     int delta;

  68.     int value;

  69.     int weightA;

  70.     int weightB;

  71.     int samplesA[8];

  72.     int samplesB[8];

  73. } Decorr;

  74. 

  75. typedef struct WvChannel {

  76.     int median[3];

  77.     int slow_level, error_limit;

  78.     int bitrate_acc, bitrate_delta;

  79. } WvChannel;

  80. 

  81. typedef struct WavpackContext {

  82.     AVCodecContext *avctx;

  83.     int frame_flags;

  84.     int stereo, stereo_in;

  85.     int joint;

  86.     uint32_t CRC;

  87.     GetBitContext gb;

  88.     int data_size; // in bits

  89.     int samples;

  90.     int terms;

  91.     Decorr decorr[MAX_TERMS];

  92.     int zero, one, zeroes;

  93.     int and, or, shift;

  94.     int post_shift;

  95.     int hybrid, hybrid_bitrate;

  96.     WvChannel ch[2];

  97. } WavpackContext;

  98. 

  99. // exponent table copied from WavPack source

  100. static const uint8_t wp_exp2_table [256] = {

  101.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  102.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  103.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  104.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  105.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  106.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  107.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  108.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  109.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  110.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  111.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  112.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  113.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  114.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  115.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  116.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  117. };

  118. 

  119. static const uint8_t wp_log2_table [] = {

  120.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  121.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  122.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  123.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  124.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  125.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  126.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  127.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  128.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  129.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  130.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  131.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  132.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  133.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  134.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  135.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  136. };

  137. 

  138. static av_always_inline int wp_exp2(int16_t val)

  139. {

  140.     int res, neg = 0;

  141. 

  142.     if(val < 0){

  143.         val = -val;

  144.         neg = 1;

  145.     }

  146. 

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

  148.     val >>= 8;

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

  150.     return neg ? -res : res;

  151. }

  152. 

  153. static av_always_inline int wp_log2(int32_t val)

  154. {

  155.     int bits;

  156. 

  157.     if(!val)

  158.         return 0;

  159.     if(val == 1)

  160.         return 256;

  161.     val += val >> 9;

  162.     bits = av_log2(val) + 1;

  163.     if(bits < 9)

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

  165.     else

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

  167. }

  168. 

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

  170. 

  171. // macros for manipulating median values

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

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

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

  175. 

  176. // macros for applying weight

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

  178.         if(samples && in){ \

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

  180.                 weight -= delta; \

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

  182.             }else{ \

  183.                 weight += delta; \

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

  185.             } \

  186.         }

  187. 

  188. 

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

  190. {

  191.     int p, e, res;

  192. 

  193.     if(k<1)return 0;

  194.     p = av_log2(k);

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

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

  197.     if(res >= e){

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

  199.     }

  200.     return res;

  201. }

  202. 

  203. static void update_error_limit(WavpackContext *ctx)

  204. {

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

  206. 

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

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

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

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

  211.     }

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

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

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

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

  216.             br[0] = 0;

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

  218.             br[0] <<= 1;

  219.             br[1] = 0;

  220.         }else{

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

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

  223.         }

  224.     }

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

  226.         if(ctx->hybrid_bitrate){

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

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

  229.             else

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

  231.         }else{

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

  233.         }

  234.     }

  235. }

  236. 

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

  238. {

  239.     int t, t2;

  240.     int sign, base, add, ret;

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

  242. 

  243.     *last = 0;

  244. 

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

  246.         if(ctx->zeroes){

  247.             ctx->zeroes--;

  248.             if(ctx->zeroes){

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

  250.                 return 0;

  251.             }

  252.         }else{

  253.             t = get_unary_0_33(gb);

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

  255.             ctx->zeroes = t;

  256.             if(ctx->zeroes){

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

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

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

  260.                 return 0;

  261.             }

  262.         }

  263.     }

  264. 

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

  266.         *last = 1;

  267.         return 0;

  268.     }

  269. 

  270.     if(ctx->zero){

  271.         t = 0;

  272.         ctx->zero = 0;

  273.     }else{

  274.         t = get_unary_0_33(gb);

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

  276.             *last = 1;

  277.             return 0;

  278.         }

  279.         if(t == 16) {

  280.             t2 = get_unary_0_33(gb);

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

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

  283.         }

  284. 

  285.         if(ctx->one){

  286.             ctx->one = t&1;

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

  288.         }else{

  289.             ctx->one = t&1;

  290.             t >>= 1;

  291.         }

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

  293.     }

  294. 

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

  296.         update_error_limit(ctx);

  297. 

  298.     if(!t){

  299.         base = 0;

  300.         add = GET_MED(0) - 1;

  301.         DEC_MED(0);

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

  303.         base = GET_MED(0);

  304.         add = GET_MED(1) - 1;

  305.         INC_MED(0);

  306.         DEC_MED(1);

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

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

  309.         add = GET_MED(2) - 1;

  310.         INC_MED(0);

  311.         INC_MED(1);

  312.         DEC_MED(2);

  313.     }else{

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

  315.         add = GET_MED(2) - 1;

  316.         INC_MED(0);

  317.         INC_MED(1);

  318.         INC_MED(2);

  319.     }

  320.     if(!c->error_limit){

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

  322.     }else{

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

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

  325.             if(get_bits1(gb)){

  326.                 add -= (mid - base);

  327.                 base = mid;

  328.             }else

  329.                 add = mid - base - 1;

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

  331.         }

  332.         ret = mid;

  333.     }

  334.     sign = get_bits1(gb);

  335.     if(ctx->hybrid_bitrate)

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

  337.     return sign ? ~ret : ret;

  338. }

  339. 

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

  341. {

  342.     int i, j, count = 0;

  343.     int last, t;

  344.     int A, B, L, L2, R, R2, bit;

  345.     int pos = 0;

  346.     uint32_t crc = 0xFFFFFFFF;

  347.     int16_t *dst16 = dst;

  348.     int32_t *dst32 = dst;

  349. 

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

  351.     do{

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

  353.         if(last) break;

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

  355.         if(last) break;

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

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

  358.             j = 0;

  359.             if(t > 0){

  360.                 if(t > 8){

  361.                     if(t & 1){

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

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

  364.                     }else{

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

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

  367.                     }

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

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

  370.                     j = 0;

  371.                 }else{

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

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

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

  375.                 }

  376.                 if(hires){

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

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

  379.                 }else{

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

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

  382.                 }

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

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

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

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

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

  388.                 if(hires)

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

  390.                 else

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

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

  393.                 L = L2;

  394.                 if(hires)

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

  396.                 else

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

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

  399.                 R = R2;

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

  401.             }else{

  402.                 if(hires)

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

  404.                 else

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

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

  407.                 R = R2;

  408. 

  409.                 if(t == -3){

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

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

  412.                 }

  413. 

  414.                 if(hires)

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

  416.                 else

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

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

  419.                 L = L2;

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

  421.             }

  422.         }

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

  424.         if(s->joint)

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

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

  427.         bit = (L & s->and) | s->or;

  428.         if(hires)

  429.             *dst32++ = (((L + bit) << s->shift) - bit) << s->post_shift;

  430.         else

  431.             *dst16++ = (((L + bit) << s->shift) - bit) << s->post_shift;

  432.         bit = (R & s->and) | s->or;

  433.         if(hires)

  434.             *dst32++ = (((R + bit) << s->shift) - bit) << s->post_shift;

  435.         else

  436.             *dst16++ = (((R + bit) << s->shift) - bit) << s->post_shift;

  437.         count++;

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

  439. 

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

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

  442.         return -1;

  443.     }

  444.     return count * 2;

  445. }

  446. 

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

  448. {

  449.     int i, j, count = 0;

  450.     int last, t;

  451.     int A, S, T, bit;

  452.     int pos = 0;

  453.     uint32_t crc = 0xFFFFFFFF;

  454.     int16_t *dst16 = dst;

  455.     int32_t *dst32 = dst;

  456. 

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

  458.     do{

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

  460.         S = 0;

  461.         if(last) break;

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

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

  464.             if(t > 8){

  465.                 if(t & 1)

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

  467.                 else

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

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

  470.                 j = 0;

  471.             }else{

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

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

  474.             }

  475.             if(hires)

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

  477.             else

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

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

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

  481.         }

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

  483.         crc = crc * 3 + S;

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

  485.         if(hires)

  486.             *dst32++ = (((S + bit) << s->shift) - bit) << s->post_shift;

  487.         else

  488.             *dst16++ = (((S + bit) << s->shift) - bit) << s->post_shift;

  489.         count++;

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

  491. 

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

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

  494.         return -1;

  495.     }

  496.     return count;

  497. }

  498. 

  499. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  500. {

  501.     WavpackContext *s = avctx->priv_data;

  502. 

  503.     s->avctx = avctx;

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

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

  506.         avctx->sample_fmt = SAMPLE_FMT_S16;

  507.     else

  508.         avctx->sample_fmt = SAMPLE_FMT_S32;

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

  510. 

  511.     return 0;

  512. }

  513. 

  514. static int wavpack_decode_frame(AVCodecContext *avctx,

  515.                             void *data, int *data_size,

  516.                             AVPacket *avpkt)

  517. {

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

  519.     int buf_size = avpkt->size;

  520.     WavpackContext *s = avctx->priv_data;

  521.     void *samples = data;

  522.     int samplecount;

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

  524.     int got_hybrid = 0;

  525.     const uint8_t* buf_end = buf + buf_size;

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

  527.     int bpp;

  528. 

  529.     if (buf_size == 0){

  530.         *data_size = 0;

  531.         return 0;

  532.     }

  533. 

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

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

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

  537. 

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

  539.     if(!s->samples){

  540.         *data_size = 0;

  541.         return buf_size;

  542.     }

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

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

  545.         bpp = 2;

  546.         avctx->sample_fmt = SAMPLE_FMT_S16;

  547.     } else {

  548.         bpp = 4;

  549.         avctx->sample_fmt = SAMPLE_FMT_S32;

  550.     }

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

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

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

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

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

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

  557. 

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

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

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

  561.         return -1;

  562.     }

  563. 

  564.     // parse metadata blocks

  565.     while(buf < buf_end){

  566.         id = *buf++;

  567.         size = *buf++;

  568.         if(id & WP_IDF_LONG) {

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

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

  571.         }

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

  573.         ssize = size;

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

  575.         if(size < 0){

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

  577.             break;

  578.         }

  579.         if(buf + ssize > buf_end){

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

  581.             break;

  582.         }

  583.         if(id & WP_IDF_IGNORE){

  584.             buf += ssize;

  585.             continue;

  586.         }

  587.         switch(id & WP_IDF_MASK){

  588.         case WP_ID_DECTERMS:

  589.             s->terms = size;

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

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

  592.                 buf += ssize;

  593.                 continue;

  594.             }

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

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

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

  598.                 buf++;

  599.             }

  600.             got_terms = 1;

  601.             break;

  602.         case WP_ID_DECWEIGHTS:

  603.             if(!got_terms){

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

  605.                 continue;

  606.             }

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

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

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

  610.                 buf += ssize;

  611.                 continue;

  612.             }

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

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

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

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

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

  618.                 if(s->stereo_in){

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

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

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

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

  623.                 }

  624.             }

  625.             got_weights = 1;

  626.             break;

  627.         case WP_ID_DECSAMPLES:

  628.             if(!got_terms){

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

  630.                 continue;

  631.             }

  632.             t = 0;

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

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

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

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

  637.                     if(s->stereo_in){

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

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

  640.                         t += 4;

  641.                     }

  642.                     t += 4;

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

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

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

  646.                     t += 4;

  647.                 }else{

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

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

  650.                         if(s->stereo_in){

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

  652.                         }

  653.                     }

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

  655.                 }

  656.             }

  657.             got_samples = 1;

  658.             break;

  659.         case WP_ID_ENTROPY:

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

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

  662.                 buf += ssize;

  663.                 continue;

  664.             }

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

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

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

  668.                     buf += 2;

  669.                 }

  670.             }

  671.             got_entropy = 1;

  672.             break;

  673.         case WP_ID_HYBRID:

  674.             if(s->hybrid_bitrate){

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

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

  677.                     buf += 2;

  678.                     size -= 2;

  679.                 }

  680.             }

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

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

  683.                 buf += 2;

  684.                 size -= 2;

  685.             }

  686.             if(size > 0){

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

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

  689.                     buf += 2;

  690.                 }

  691.             }else{

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

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

  694.             }

  695.             got_hybrid = 1;

  696.             break;

  697.         case WP_ID_INT32INFO:

  698.             if(size != 4){

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

  700.                 buf += ssize;

  701.                 continue;

  702.             }

  703.             if(buf[0])

  704.                 s->post_shift = buf[0];

  705.             else if(buf[1])

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

  707.             else if(buf[2]){

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

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

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

  711.                 s->and = 1;

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

  713.             }

  714.             buf += 4;

  715.             break;

  716.         case WP_ID_DATA:

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

  718.             s->data_size = size * 8;

  719.             buf += size;

  720.             got_bs = 1;

  721.             break;

  722.         default:

  723.             buf += size;

  724.         }

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

  726.     }

  727.     if(!got_terms){

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

  729.         return -1;

  730.     }

  731.     if(!got_weights){

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

  733.         return -1;

  734.     }

  735.     if(!got_samples){

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

  737.         return -1;

  738.     }

  739.     if(!got_entropy){

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

  741.         return -1;

  742.     }

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

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

  745.         return -1;

  746.     }

  747.     if(!got_bs){

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

  749.         return -1;

  750.     }

  751. 

  752.     if(s->stereo_in){

  753.         if(bpp == 2)

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

  755.         else

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

  757.     }else{

  758.         if(bpp == 2)

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

  760.         else

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

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

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

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

  765.             int cnt = samplecount;

  766.             while(cnt--){

  767.                 *--dst = *--src;

  768.                 *--dst = *src;

  769.             }

  770.             samplecount *= 2;

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

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

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

  774.             int cnt = samplecount;

  775.             while(cnt--){

  776.                 *--dst = *--src;

  777.                 *--dst = *src;

  778.             }

  779.             samplecount *= 2;

  780.         }

  781.     }

  782.     *data_size = samplecount * bpp;

  783. 

  784.     return buf_size;

  785. }

  786. 

  787. AVCodec wavpack_decoder = {

  788.     "wavpack",

  789.     CODEC_TYPE_AUDIO,

  790.     CODEC_ID_WAVPACK,

  791.     sizeof(WavpackContext),

  792.     wavpack_decode_init,

  793.     NULL,

  794.     NULL,

  795.     wavpack_decode_frame,

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

  797. };