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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 Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #define BITSTREAM_READER_LE

  23. 

  24. #include "libavutil/audioconvert.h"

  25. #include "avcodec.h"

  26. #include "get_bits.h"

  27. #include "unary.h"

  28. 

  29. /**

  30.  * @file

  31.  * WavPack lossless audio decoder

  32.  */

  33. 

  34. #define WV_MONO           0x00000004

  35. #define WV_JOINT_STEREO   0x00000010

  36. #define WV_FALSE_STEREO   0x40000000

  37. 

  38. #define WV_HYBRID_MODE    0x00000008

  39. #define WV_HYBRID_SHAPE   0x00000008

  40. #define WV_HYBRID_BITRATE 0x00000200

  41. #define WV_HYBRID_BALANCE 0x00000400

  42. 

  43. #define WV_FLT_SHIFT_ONES 0x01

  44. #define WV_FLT_SHIFT_SAME 0x02

  45. #define WV_FLT_SHIFT_SENT 0x04

  46. #define WV_FLT_ZERO_SENT  0x08

  47. #define WV_FLT_ZERO_SIGN  0x10

  48. 

  49. enum WP_ID_Flags {

  50.     WP_IDF_MASK   = 0x1F,

  51.     WP_IDF_IGNORE = 0x20,

  52.     WP_IDF_ODD    = 0x40,

  53.     WP_IDF_LONG   = 0x80

  54. };

  55. 

  56. enum WP_ID {

  57.     WP_ID_DUMMY = 0,

  58.     WP_ID_ENCINFO,

  59.     WP_ID_DECTERMS,

  60.     WP_ID_DECWEIGHTS,

  61.     WP_ID_DECSAMPLES,

  62.     WP_ID_ENTROPY,

  63.     WP_ID_HYBRID,

  64.     WP_ID_SHAPING,

  65.     WP_ID_FLOATINFO,

  66.     WP_ID_INT32INFO,

  67.     WP_ID_DATA,

  68.     WP_ID_CORR,

  69.     WP_ID_EXTRABITS,

  70.     WP_ID_CHANINFO

  71. };

  72. 

  73. typedef struct SavedContext {

  74.     int offset;

  75.     int size;

  76.     int bits_used;

  77.     uint32_t crc;

  78. } SavedContext;

  79. 

  80. #define MAX_TERMS 16

  81. 

  82. typedef struct Decorr {

  83.     int delta;

  84.     int value;

  85.     int weightA;

  86.     int weightB;

  87.     int samplesA[8];

  88.     int samplesB[8];

  89. } Decorr;

  90. 

  91. typedef struct WvChannel {

  92.     int median[3];

  93.     int slow_level, error_limit;

  94.     int bitrate_acc, bitrate_delta;

  95. } WvChannel;

  96. 

  97. typedef struct WavpackFrameContext {

  98.     AVCodecContext *avctx;

  99.     int frame_flags;

  100.     int stereo, stereo_in;

  101.     int joint;

  102.     uint32_t CRC;

  103.     GetBitContext gb;

  104.     int got_extra_bits;

  105.     uint32_t crc_extra_bits;

  106.     GetBitContext gb_extra_bits;

  107.     int data_size; // in bits

  108.     int samples;

  109.     int terms;

  110.     Decorr decorr[MAX_TERMS];

  111.     int zero, one, zeroes;

  112.     int extra_bits;

  113.     int and, or, shift;

  114.     int post_shift;

  115.     int hybrid, hybrid_bitrate;

  116.     int hybrid_maxclip, hybrid_minclip;

  117.     int float_flag;

  118.     int float_shift;

  119.     int float_max_exp;

  120.     WvChannel ch[2];

  121.     int pos;

  122.     SavedContext sc, extra_sc;

  123. } WavpackFrameContext;

  124. 

  125. #define WV_MAX_FRAME_DECODERS 14

  126. 

  127. typedef struct WavpackContext {

  128.     AVCodecContext *avctx;

  129.     AVFrame frame;

  130. 

  131.     WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];

  132.     int fdec_num;

  133. 

  134.     int multichannel;

  135.     int mkv_mode;

  136.     int block;

  137.     int samples;

  138.     int ch_offset;

  139. } WavpackContext;

  140. 

  141. // exponent table copied from WavPack source

  142. static const uint8_t wp_exp2_table [256] = {

  143.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  144.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  145.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  146.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  147.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  148.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  149.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  150.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  151.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  152.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  153.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  154.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  155.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  156.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  157.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  158.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  159. };

  160. 

  161. static const uint8_t wp_log2_table [] = {

  162.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  163.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  164.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  165.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  166.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  167.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  168.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  169.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  170.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  171.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  172.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  173.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  174.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  175.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  176.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  177.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  178. };

  179. 

  180. static av_always_inline int wp_exp2(int16_t val)

  181. {

  182.     int res, neg = 0;

  183. 

  184.     if (val < 0) {

  185.         val = -val;

  186.         neg = 1;

  187.     }

  188. 

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

  190.     val >>= 8;

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

  192.     return neg ? -res : res;

  193. }

  194. 

  195. static av_always_inline int wp_log2(int32_t val)

  196. {

  197.     int bits;

  198. 

  199.     if (!val)

  200.         return 0;

  201.     if (val == 1)

  202.         return 256;

  203.     val += val >> 9;

  204.     bits = av_log2(val) + 1;

  205.     if (bits < 9)

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

  207.     else

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

  209. }

  210. 

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

  212. 

  213. // macros for manipulating median values

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

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

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

  217. 

  218. // macros for applying weight

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

  220.     if (samples && in) { \

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

  222.             weight -= delta; \

  223.             if (weight < -1024) \

  224.                 weight = -1024; \

  225.         } else { \

  226.             weight += delta; \

  227.             if (weight > 1024) \

  228.                 weight = 1024; \

  229.         } \

  230.     }

  231. 

  232. 

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

  234. {

  235.     int p, e, res;

  236. 

  237.     if (k < 1)

  238.         return 0;

  239.     p = av_log2(k);

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

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

  242.     if (res >= e)

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

  244.     return res;

  245. }

  246. 

  247. static void update_error_limit(WavpackFrameContext *ctx)

  248. {

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

  250. 

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

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

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

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

  255.     }

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

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

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

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

  260.             br[0] = 0;

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

  262.             br[0] <<= 1;

  263.             br[1] = 0;

  264.         } else {

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

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

  267.         }

  268.     }

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

  270.         if (ctx->hybrid_bitrate) {

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

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

  273.             else

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

  275.         } else {

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

  277.         }

  278.     }

  279. }

  280. 

  281. static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb,

  282.                         int channel, int *last)

  283. {

  284.     int t, t2;

  285.     int sign, base, add, ret;

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

  287. 

  288.     *last = 0;

  289. 

  290.     if ((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) &&

  291.         !ctx->zero && !ctx->one) {

  292.         if (ctx->zeroes) {

  293.             ctx->zeroes--;

  294.             if (ctx->zeroes) {

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

  296.                 return 0;

  297.             }

  298.         } else {

  299.             t = get_unary_0_33(gb);

  300.             if (t >= 2) {

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

  302.                     goto error;

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

  304.             } else {

  305.                 if (get_bits_left(gb) < 0)

  306.                     goto error;

  307.             }

  308.             ctx->zeroes = t;

  309.             if (ctx->zeroes) {

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

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

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

  313.                 return 0;

  314.             }

  315.         }

  316.     }

  317. 

  318.     if (ctx->zero) {

  319.         t = 0;

  320.         ctx->zero = 0;

  321.     } else {

  322.         t = get_unary_0_33(gb);

  323.         if (get_bits_left(gb) < 0)

  324.             goto error;

  325.         if (t == 16) {

  326.             t2 = get_unary_0_33(gb);

  327.             if (t2 < 2) {

  328.                 if (get_bits_left(gb) < 0)

  329.                     goto error;

  330.                 t += t2;

  331.             } else {

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

  333.                     goto error;

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

  335.             }

  336.         }

  337. 

  338.         if (ctx->one) {

  339.             ctx->one = t & 1;

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

  341.         } else {

  342.             ctx->one = t & 1;

  343.             t >>= 1;

  344.         }

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

  346.     }

  347. 

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

  349.         update_error_limit(ctx);

  350. 

  351.     if (!t) {

  352.         base = 0;

  353.         add  = GET_MED(0) - 1;

  354.         DEC_MED(0);

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

  356.         base = GET_MED(0);

  357.         add  = GET_MED(1) - 1;

  358.         INC_MED(0);

  359.         DEC_MED(1);

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

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

  362.         add  = GET_MED(2) - 1;

  363.         INC_MED(0);

  364.         INC_MED(1);

  365.         DEC_MED(2);

  366.     } else {

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

  368.         add  = GET_MED(2) - 1;

  369.         INC_MED(0);

  370.         INC_MED(1);

  371.         INC_MED(2);

  372.     }

  373.     if (!c->error_limit) {

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

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

  376.             goto error;

  377.     } else {

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

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

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

  381.                 goto error;

  382.             if (get_bits1(gb)) {

  383.                 add -= (mid - base);

  384.                 base = mid;

  385.             } else

  386.                 add = mid - base - 1;

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

  388.         }

  389.         ret = mid;

  390.     }

  391.     sign = get_bits1(gb);

  392.     if (ctx->hybrid_bitrate)

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

  394.     return sign ? ~ret : ret;

  395. 

  396. error:

  397.     *last = 1;

  398.     return 0;

  399. }

  400. 

  401. static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc,

  402.                                        int S)

  403. {

  404.     int bit;

  405. 

  406.     if (s->extra_bits){

  407.         S <<= s->extra_bits;

  408. 

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

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

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

  412.         }

  413.     }

  414. 

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

  416.     bit = ((S + bit) << s->shift) - bit;

  417. 

  418.     if (s->hybrid)

  419.         bit = av_clip(bit, s->hybrid_minclip, s->hybrid_maxclip);

  420. 

  421.     return bit << s->post_shift;

  422. }

  423. 

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

  425. {

  426.     union {

  427.         float    f;

  428.         uint32_t u;

  429.     } value;

  430. 

  431.     int sign;

  432.     int exp = s->float_max_exp;

  433. 

  434.     if (s->got_extra_bits) {

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

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

  437. 

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

  439.             return 0.0;

  440.     }

  441. 

  442.     if (S) {

  443.         S <<= s->float_shift;

  444.         sign = S < 0;

  445.         if (sign)

  446.             S = -S;

  447.         if (S >= 0x1000000) {

  448.             if (s->got_extra_bits && get_bits1(&s->gb_extra_bits))

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

  450.             else

  451.                 S = 0;

  452.             exp = 255;

  453.         } else if (exp) {

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

  455.             exp = s->float_max_exp;

  456.             if (exp <= shift)

  457.                 shift = --exp;

  458.             exp -= shift;

  459. 

  460.             if (shift) {

  461.                 S <<= shift;

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

  463.                     (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) &&

  464.                      get_bits1(&s->gb_extra_bits))) {

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

  466.                 } else if (s->got_extra_bits &&

  467.                            (s->float_flag & WV_FLT_SHIFT_SENT)) {

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

  469.                 }

  470.             }

  471.         } else {

  472.             exp = s->float_max_exp;

  473.         }

  474.         S &= 0x7fffff;

  475.     } else {

  476.         sign = 0;

  477.         exp = 0;

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

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

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

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

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

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

  484.             } else {

  485.                 if (s->float_flag & WV_FLT_ZERO_SIGN)

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

  487.             }

  488.         }

  489.     }

  490. 

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

  492. 

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

  494.     return value.f;

  495. }

  496. 

  497. static void wv_reset_saved_context(WavpackFrameContext *s)

  498. {

  499.     s->pos = 0;

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

  501. }

  502. 

  503. static inline int wv_check_crc(WavpackFrameContext *s, uint32_t crc,

  504.                                uint32_t crc_extra_bits)

  505. {

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

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

  508.         return AVERROR_INVALIDDATA;

  509.     }

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

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

  512.         return AVERROR_INVALIDDATA;

  513.     }

  514. 

  515.     return 0;

  516. }

  517. 

  518. static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,

  519.                                    void *dst, const int type)

  520. {

  521.     int i, j, count = 0;

  522.     int last, t;

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

  524.     int pos = s->pos;

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

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

  527.     int16_t *dst16 = dst;

  528.     int32_t *dst32 = dst;

  529.     float   *dstfl = dst;

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

  531. 

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

  533.     do {

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

  535.         if (last)

  536.             break;

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

  538.         if (last)

  539.             break;

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

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

  542.             if (t > 0) {

  543.                 if (t > 8) {

  544.                     if (t & 1) {

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

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

  547.                     } else {

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

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

  550.                     }

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

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

  553.                     j = 0;

  554.                 } else {

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

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

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

  558.                 }

  559.                 if (type != AV_SAMPLE_FMT_S16) {

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

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

  562.                 } else {

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

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

  565.                 }

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

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

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

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

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

  571.                 if (type != AV_SAMPLE_FMT_S16)

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

  573.                 else

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

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

  576.                 L = L2;

  577.                 if (type != AV_SAMPLE_FMT_S16)

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

  579.                 else

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

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

  582.                 R = R2;

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

  584.             } else {

  585.                 if (type != AV_SAMPLE_FMT_S16)

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

  587.                 else

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

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

  590.                 R = R2;

  591. 

  592.                 if (t == -3) {

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

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

  595.                 }

  596. 

  597.                 if (type != AV_SAMPLE_FMT_S16)

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

  599.                 else

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

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

  602.                 L = L2;

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

  604.             }

  605.         }

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

  607.         if (s->joint)

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

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

  610. 

  611.         if (type == AV_SAMPLE_FMT_FLT) {

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

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

  614.             dstfl += channel_pad;

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

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

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

  618.             dst32 += channel_pad;

  619.         } else {

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

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

  622.             dst16 += channel_pad;

  623.         }

  624.         count++;

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

  626. 

  627.     wv_reset_saved_context(s);

  628.     if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&

  629.         wv_check_crc(s, crc, crc_extra_bits))

  630.         return AVERROR_INVALIDDATA;

  631. 

  632.     return count * 2;

  633. }

  634. 

  635. static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,

  636.                                  void *dst, const int type)

  637. {

  638.     int i, j, count = 0;

  639.     int last, t;

  640.     int A, S, T;

  641.     int pos = s->pos;

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

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

  644.     int16_t *dst16 = dst;

  645.     int32_t *dst32 = dst;

  646.     float   *dstfl = dst;

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

  648. 

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

  650.     do {

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

  652.         S = 0;

  653.         if (last)

  654.             break;

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

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

  657.             if (t > 8) {

  658.                 if (t & 1)

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

  660.                 else

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

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

  663.                 j = 0;

  664.             } else {

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

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

  667.             }

  668.             if (type != AV_SAMPLE_FMT_S16)

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

  670.             else

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

  672.             if (A && T)

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

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

  675.         }

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

  677.         crc = crc * 3 + S;

  678. 

  679.         if (type == AV_SAMPLE_FMT_FLT) {

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

  681.             dstfl += channel_stride;

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

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

  684.             dst32 += channel_stride;

  685.         } else {

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

  687.             dst16 += channel_stride;

  688.         }

  689.         count++;

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

  691. 

  692.     wv_reset_saved_context(s);

  693.     if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&

  694.         wv_check_crc(s, crc, crc_extra_bits))

  695.         return AVERROR_INVALIDDATA;

  696. 

  697.     return count;

  698. }

  699. 

  700. static av_cold int wv_alloc_frame_context(WavpackContext *c)

  701. {

  702. 

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

  704.         return -1;

  705. 

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

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

  708.         return -1;

  709.     c->fdec_num++;

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

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

  712. 

  713.     return 0;

  714. }

  715. 

  716. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  717. {

  718.     WavpackContext *s = avctx->priv_data;

  719. 

  720.     s->avctx = avctx;

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

  722.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  723.     else

  724.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

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

  726.         avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO :

  727.                                                          AV_CH_LAYOUT_MONO;

  728. 

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

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

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

  732.     s->mkv_mode = 0;

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

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

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

  736.             s->mkv_mode = 1;

  737.     }

  738. 

  739.     s->fdec_num = 0;

  740. 

  741.     avcodec_get_frame_defaults(&s->frame);

  742.     avctx->coded_frame = &s->frame;

  743. 

  744.     return 0;

  745. }

  746. 

  747. static av_cold int wavpack_decode_end(AVCodecContext *avctx)

  748. {

  749.     WavpackContext *s = avctx->priv_data;

  750.     int i;

  751. 

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

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

  754.     s->fdec_num = 0;

  755. 

  756.     return 0;

  757. }

  758. 

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

  760.                                 void *data, int *got_frame_ptr,

  761.                                 const uint8_t *buf, int buf_size)

  762. {

  763.     WavpackContext *wc = avctx->priv_data;

  764.     WavpackFrameContext *s;

  765.     void *samples = data;

  766.     int samplecount;

  767.     int got_terms   = 0, got_weights = 0, got_samples = 0,

  768.         got_entropy = 0, got_bs      = 0, got_float   = 0, got_hybrid = 0;

  769.     const uint8_t *orig_buf = buf;

  770.     const uint8_t *buf_end  = buf + buf_size;

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

  772.     int bpp, chan, chmask, orig_bpp;

  773. 

  774.     if (buf_size == 0) {

  775.         *got_frame_ptr = 0;

  776.         return 0;

  777.     }

  778. 

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

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

  781.         return -1;

  782.     }

  783. 

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

  785.     if (!s) {

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

  787.         return -1;

  788.     }

  789. 

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

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

  792.     s->extra_bits = 0;

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

  794.     s->got_extra_bits = 0;

  795. 

  796.     if (!wc->mkv_mode) {

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

  798.         if (!s->samples) {

  799.             *got_frame_ptr = 0;

  800.             return 0;

  801.         }

  802.     } else {

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

  804.     }

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

  806.     bpp = av_get_bytes_per_sample(avctx->sample_fmt);

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

  808.     orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;

  809. 

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

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

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

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

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

  815.     s->post_shift     = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);

  816.     s->hybrid_maxclip = (( 1LL << (orig_bpp - 1)) - 1) >> s->post_shift;

  817.     s->hybrid_minclip = ((-1LL << (orig_bpp - 1)))     >> s->post_shift;

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

  819.     if (wc->mkv_mode)

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

  821. 

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

  823. 

  824.     // parse metadata blocks

  825.     while (buf < buf_end) {

  826.         id   = *buf++;

  827.         size = *buf++;

  828.         if (id & WP_IDF_LONG) {

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

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

  831.         }

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

  833.         ssize = size;

  834.         if (id & WP_IDF_ODD)

  835.             size--;

  836.         if (size < 0) {

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

  838.             break;

  839.         }

  840.         if (buf + ssize > buf_end) {

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

  842.             break;

  843.         }

  844.         if (id & WP_IDF_IGNORE) {

  845.             buf += ssize;

  846.             continue;

  847.         }

  848.         switch (id & WP_IDF_MASK) {

  849.         case WP_ID_DECTERMS:

  850.             if (size > MAX_TERMS) {

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

  852.                 s->terms = 0;

  853.                 buf += ssize;

  854.                 continue;

  855.             }

  856.             s->terms = size;

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

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

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

  860.                 buf++;

  861.             }

  862.             got_terms = 1;

  863.             break;

  864.         case WP_ID_DECWEIGHTS:

  865.             if (!got_terms) {

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

  867.                 continue;

  868.             }

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

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

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

  872.                 buf += ssize;

  873.                 continue;

  874.             }

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

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

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

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

  879.                     s->decorr[s->terms - i - 1].weightA +=

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

  881.                 if (s->stereo_in) {

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

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

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

  885.                         s->decorr[s->terms - i - 1].weightB +=

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

  887.                 }

  888.             }

  889.             got_weights = 1;

  890.             break;

  891.         case WP_ID_DECSAMPLES:

  892.             if (!got_terms) {

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

  894.                 continue;

  895.             }

  896.             t = 0;

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

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

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

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

  901.                     if (s->stereo_in) {

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

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

  904.                         t += 4;

  905.                     }

  906.                     t += 4;

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

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

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

  910.                     t += 4;

  911.                 } else {

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

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

  914.                         if (s->stereo_in) {

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

  916.                         }

  917.                     }

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

  919.                 }

  920.             }

  921.             got_samples = 1;

  922.             break;

  923.         case WP_ID_ENTROPY:

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

  925.                 av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, "

  926.                        "got %i", 6 * (s->stereo_in + 1), size);

  927.                 buf += ssize;

  928.                 continue;

  929.             }

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

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

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

  933.                     buf += 2;

  934.                 }

  935.             }

  936.             got_entropy = 1;

  937.             break;

  938.         case WP_ID_HYBRID:

  939.             if (s->hybrid_bitrate) {

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

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

  942.                     buf += 2;

  943.                     size -= 2;

  944.                 }

  945.             }

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

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

  948.                 buf += 2;

  949.                 size -= 2;

  950.             }

  951.             if (size > 0) {

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

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

  954.                     buf += 2;

  955.                 }

  956.             } else {

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

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

  959.             }

  960.             got_hybrid = 1;

  961.             break;

  962.         case WP_ID_INT32INFO:

  963.             if (size != 4) {

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

  965.                 buf += ssize;

  966.                 continue;

  967.             }

  968.             if (buf[0])

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

  970.             else if (buf[1])

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

  972.             else if (buf[2]){

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

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

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

  976.                 s->and   = 1;

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

  978.             }

  979.             /* original WavPack decoder forces 32-bit lossy sound to be treated

  980.              * as 24-bit one in order to have proper clipping

  981.              */

  982.             if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {

  983.                 s->post_shift += 8;

  984.                 s->shift      -= 8;

  985.                 s->hybrid_maxclip >>= 8;

  986.                 s->hybrid_minclip >>= 8;

  987.             }

  988.             buf += 4;

  989.             break;

  990.         case WP_ID_FLOATINFO:

  991.             if (size != 4) {

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

  993.                 buf += ssize;

  994.                 continue;

  995.             }

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

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

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

  999.             buf += 4;

  1000.             got_float = 1;

  1001.             break;

  1002.         case WP_ID_DATA:

  1003.             s->sc.offset = buf - orig_buf;

  1004.             s->sc.size   = size * 8;

  1005.             init_get_bits(&s->gb, buf, size * 8);

  1006.             s->data_size = size * 8;

  1007.             buf += size;

  1008.             got_bs = 1;

  1009.             break;

  1010.         case WP_ID_EXTRABITS:

  1011.             if (size <= 4) {

  1012.                 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",

  1013.                        size);

  1014.                 buf += size;

  1015.                 continue;

  1016.             }

  1017.             s->extra_sc.offset = buf - orig_buf;

  1018.             s->extra_sc.size   = size * 8;

  1019.             init_get_bits(&s->gb_extra_bits, buf, size * 8);

  1020.             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);

  1021.             buf += size;

  1022.             s->got_extra_bits = 1;

  1023.             break;

  1024.         case WP_ID_CHANINFO:

  1025.             if (size <= 1) {

  1026.                 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");

  1027.                 return -1;

  1028.             }

  1029.             chan = *buf++;

  1030.             switch (size - 2) {

  1031.             case 0: chmask = *buf;         break;

  1032.             case 1: chmask = AV_RL16(buf); break;

  1033.             case 2: chmask = AV_RL24(buf); break;

  1034.             case 3: chmask = AV_RL32(buf); break;

  1035.             case 5:

  1036.                 chan |= (buf[1] & 0xF) << 8;

  1037.                 chmask = AV_RL24(buf + 2);

  1038.                 break;

  1039.             default:

  1040.                 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",

  1041.                        size);

  1042.                 chan   = avctx->channels;

  1043.                 chmask = avctx->channel_layout;

  1044.             }

  1045.             if (chan != avctx->channels) {

  1046.                 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, "

  1047.                        "decoder believes it's %d channels\n", chan,

  1048.                        avctx->channels);

  1049.                 return -1;

  1050.             }

  1051.             if (!avctx->channel_layout)

  1052.                 avctx->channel_layout = chmask;

  1053.             buf += size - 1;

  1054.             break;

  1055.         default:

  1056.             buf += size;

  1057.         }

  1058.         if (id & WP_IDF_ODD)

  1059.             buf++;

  1060.     }

  1061. 

  1062.     if (!got_terms) {

  1063.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");

  1064.         return -1;

  1065.     }

  1066.     if (!got_weights) {

  1067.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");

  1068.         return -1;

  1069.     }

  1070.     if (!got_samples) {

  1071.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");

  1072.         return -1;

  1073.     }

  1074.     if (!got_entropy) {

  1075.         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");

  1076.         return -1;

  1077.     }

  1078.     if (s->hybrid && !got_hybrid) {

  1079.         av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");

  1080.         return -1;

  1081.     }

  1082.     if (!got_bs) {

  1083.         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");

  1084.         return -1;

  1085.     }

  1086.     if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT) {

  1087.         av_log(avctx, AV_LOG_ERROR, "Float information not found\n");

  1088.         return -1;

  1089.     }

  1090.     if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT) {

  1091.         const int size   = get_bits_left(&s->gb_extra_bits);

  1092.         const int wanted = s->samples * s->extra_bits << s->stereo_in;

  1093.         if (size < wanted) {

  1094.             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");

  1095.             s->got_extra_bits = 0;

  1096.         }

  1097.     }

  1098. 

  1099.     if (s->stereo_in) {

  1100.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1101.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1102.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1103.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1104.         else

  1105.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1106. 

  1107.         if (samplecount < 0)

  1108.             return -1;

  1109. 

  1110.         samplecount >>= 1;

  1111.     } else {

  1112.         const int channel_stride = avctx->channels;

  1113. 

  1114.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1115.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1116.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1117.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1118.         else

  1119.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1120. 

  1121.         if (samplecount < 0)

  1122.             return -1;

  1123. 

  1124.         if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16) {

  1125.             int16_t *dst = (int16_t*)samples + 1;

  1126.             int16_t *src = (int16_t*)samples;

  1127.             int cnt = samplecount;

  1128.             while (cnt--) {

  1129.                 *dst = *src;

  1130.                 src += channel_stride;

  1131.                 dst += channel_stride;

  1132.             }

  1133.         } else if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32) {

  1134.             int32_t *dst = (int32_t*)samples + 1;

  1135.             int32_t *src = (int32_t*)samples;

  1136.             int cnt = samplecount;

  1137.             while (cnt--) {

  1138.                 *dst = *src;

  1139.                 src += channel_stride;

  1140.                 dst += channel_stride;

  1141.             }

  1142.         } else if (s->stereo) {

  1143.             float *dst = (float*)samples + 1;

  1144.             float *src = (float*)samples;

  1145.             int cnt = samplecount;

  1146.             while (cnt--) {

  1147.                 *dst = *src;

  1148.                 src += channel_stride;

  1149.                 dst += channel_stride;

  1150.             }

  1151.         }

  1152.     }

  1153. 

  1154.     *got_frame_ptr = 1;

  1155. 

  1156.     return samplecount * bpp;

  1157. }

  1158. 

  1159. static void wavpack_decode_flush(AVCodecContext *avctx)

  1160. {

  1161.     WavpackContext *s = avctx->priv_data;

  1162.     int i;

  1163. 

  1164.     for (i = 0; i < s->fdec_num; i++)

  1165.         wv_reset_saved_context(s->fdec[i]);

  1166. }

  1167. 

  1168. static int wavpack_decode_frame(AVCodecContext *avctx, void *data,

  1169.                                 int *got_frame_ptr, AVPacket *avpkt)

  1170. {

  1171.     WavpackContext *s  = avctx->priv_data;

  1172.     const uint8_t *buf = avpkt->data;

  1173.     int buf_size       = avpkt->size;

  1174.     int frame_size, ret, frame_flags;

  1175.     int samplecount = 0;

  1176. 

  1177.     s->block     = 0;

  1178.     s->ch_offset = 0;

  1179. 

  1180.     /* determine number of samples */

  1181.     if (s->mkv_mode) {

  1182.         s->samples  = AV_RL32(buf); buf += 4;

  1183.         frame_flags = AV_RL32(buf);

  1184.     } else {

  1185.         if (s->multichannel) {

  1186.             s->samples  = AV_RL32(buf + 4);

  1187.             frame_flags = AV_RL32(buf + 8);

  1188.         } else {

  1189.             s->samples  = AV_RL32(buf);

  1190.             frame_flags = AV_RL32(buf + 4);

  1191.         }

  1192.     }

  1193.     if (s->samples <= 0) {

  1194.         av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",

  1195.                s->samples);

  1196.         return AVERROR(EINVAL);

  1197.     }

  1198. 

  1199.     if (frame_flags & 0x80) {

  1200.         avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

  1201.     } else if ((frame_flags & 0x03) <= 1) {

  1202.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  1203.     } else {

  1204.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

  1205.     }

  1206. 

  1207.     /* get output buffer */

  1208.     s->frame.nb_samples = s->samples;

  1209.     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {

  1210.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1211.         return ret;

  1212.     }

  1213. 

  1214.     while (buf_size > 0) {

  1215.         if (!s->multichannel) {

  1216.             frame_size = buf_size;

  1217.         } else {

  1218.             if (!s->mkv_mode) {

  1219.                 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;

  1220.             } else {

  1221.                 if (buf_size < 12) //MKV files can have zero flags after last block

  1222.                     break;

  1223.                 frame_size = AV_RL32(buf + 8) + 12;

  1224.             }

  1225.         }

  1226.         if (frame_size < 0 || frame_size > buf_size) {

  1227.             av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d "

  1228.                    "vs. %d bytes left)\n", s->block, frame_size, buf_size);

  1229.             wavpack_decode_flush(avctx);

  1230.             return -1;

  1231.         }

  1232.         if ((samplecount = wavpack_decode_block(avctx, s->block,

  1233.                                                 s->frame.data[0], got_frame_ptr,

  1234.                                                 buf, frame_size)) < 0) {

  1235.             wavpack_decode_flush(avctx);

  1236.             return -1;

  1237.         }

  1238.         s->block++;

  1239.         buf += frame_size; buf_size -= frame_size;

  1240.     }

  1241. 

  1242.     if (*got_frame_ptr)

  1243.         *(AVFrame *)data = s->frame;

  1244. 

  1245.     return avpkt->size;

  1246. }

  1247. 

  1248. AVCodec ff_wavpack_decoder = {

  1249.     .name           = "wavpack",

  1250.     .type           = AVMEDIA_TYPE_AUDIO,

  1251.     .id             = CODEC_ID_WAVPACK,

  1252.     .priv_data_size = sizeof(WavpackContext),

  1253.     .init           = wavpack_decode_init,

  1254.     .close          = wavpack_decode_end,

  1255.     .decode         = wavpack_decode_frame,

  1256.     .flush          = wavpack_decode_flush,

  1257.     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,

  1258.     .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),

  1259. };