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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. 

  22. #define BITSTREAM_READER_LE

  23. 

  24. #include "libavutil/channel_layout.h"

  25. #include "avcodec.h"

  26. #include "get_bits.h"

  27. #include "internal.h"

  28. #include "unary.h"

  29. 

  30. /**

  31.  * @file

  32.  * WavPack lossless audio decoder

  33.  */

  34. 

  35. #define WV_MONO           0x00000004

  36. #define WV_JOINT_STEREO   0x00000010

  37. #define WV_FALSE_STEREO   0x40000000

  38. 

  39. #define WV_HYBRID_MODE    0x00000008

  40. #define WV_HYBRID_SHAPE   0x00000008

  41. #define WV_HYBRID_BITRATE 0x00000200

  42. #define WV_HYBRID_BALANCE 0x00000400

  43. 

  44. #define WV_FLT_SHIFT_ONES 0x01

  45. #define WV_FLT_SHIFT_SAME 0x02

  46. #define WV_FLT_SHIFT_SENT 0x04

  47. #define WV_FLT_ZERO_SENT  0x08

  48. #define WV_FLT_ZERO_SIGN  0x10

  49. 

  50. #define WV_MAX_SAMPLES    131072

  51. 

  52. enum WP_ID_Flags {

  53.     WP_IDF_MASK   = 0x1F,

  54.     WP_IDF_IGNORE = 0x20,

  55.     WP_IDF_ODD    = 0x40,

  56.     WP_IDF_LONG   = 0x80

  57. };

  58. 

  59. enum WP_ID {

  60.     WP_ID_DUMMY = 0,

  61.     WP_ID_ENCINFO,

  62.     WP_ID_DECTERMS,

  63.     WP_ID_DECWEIGHTS,

  64.     WP_ID_DECSAMPLES,

  65.     WP_ID_ENTROPY,

  66.     WP_ID_HYBRID,

  67.     WP_ID_SHAPING,

  68.     WP_ID_FLOATINFO,

  69.     WP_ID_INT32INFO,

  70.     WP_ID_DATA,

  71.     WP_ID_CORR,

  72.     WP_ID_EXTRABITS,

  73.     WP_ID_CHANINFO

  74. };

  75. 

  76. typedef struct SavedContext {

  77.     int offset;

  78.     int size;

  79.     int bits_used;

  80.     uint32_t crc;

  81. } SavedContext;

  82. 

  83. #define MAX_TERMS 16

  84. 

  85. typedef struct Decorr {

  86.     int delta;

  87.     int value;

  88.     int weightA;

  89.     int weightB;

  90.     int samplesA[8];

  91.     int samplesB[8];

  92. } Decorr;

  93. 

  94. typedef struct WvChannel {

  95.     int median[3];

  96.     int slow_level, error_limit;

  97.     int bitrate_acc, bitrate_delta;

  98. } WvChannel;

  99. 

  100. typedef struct WavpackFrameContext {

  101.     AVCodecContext *avctx;

  102.     int frame_flags;

  103.     int stereo, stereo_in;

  104.     int joint;

  105.     uint32_t CRC;

  106.     GetBitContext gb;

  107.     int got_extra_bits;

  108.     uint32_t crc_extra_bits;

  109.     GetBitContext gb_extra_bits;

  110.     int data_size; // in bits

  111.     int samples;

  112.     int terms;

  113.     Decorr decorr[MAX_TERMS];

  114.     int zero, one, zeroes;

  115.     int extra_bits;

  116.     int and, or, shift;

  117.     int post_shift;

  118.     int hybrid, hybrid_bitrate;

  119.     int hybrid_maxclip, hybrid_minclip;

  120.     int float_flag;

  121.     int float_shift;

  122.     int float_max_exp;

  123.     WvChannel ch[2];

  124.     int pos;

  125.     SavedContext sc, extra_sc;

  126. } WavpackFrameContext;

  127. 

  128. #define WV_MAX_FRAME_DECODERS 14

  129. 

  130. typedef struct WavpackContext {

  131.     AVCodecContext *avctx;

  132.     AVFrame frame;

  133. 

  134.     WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];

  135.     int fdec_num;

  136. 

  137.     int multichannel;

  138.     int mkv_mode;

  139.     int block;

  140.     int samples;

  141.     int ch_offset;

  142. } WavpackContext;

  143. 

  144. // exponent table copied from WavPack source

  145. static const uint8_t wp_exp2_table [256] = {

  146.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  147.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  148.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  149.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  150.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  151.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  152.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  153.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  154.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  155.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  156.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  157.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  158.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  159.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  160.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  161.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  162. };

  163. 

  164. static const uint8_t wp_log2_table [] = {

  165.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  166.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  167.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  168.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  169.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  170.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  171.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  172.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  173.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  174.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  175.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  176.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  177.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  178.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  179.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  180.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  181. };

  182. 

  183. static av_always_inline int wp_exp2(int16_t val)

  184. {

  185.     int res, neg = 0;

  186. 

  187.     if (val < 0) {

  188.         val = -val;

  189.         neg = 1;

  190.     }

  191. 

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

  193.     val >>= 8;

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

  195.     return neg ? -res : res;

  196. }

  197. 

  198. static av_always_inline int wp_log2(int32_t val)

  199. {

  200.     int bits;

  201. 

  202.     if (!val)

  203.         return 0;

  204.     if (val == 1)

  205.         return 256;

  206.     val += val >> 9;

  207.     bits = av_log2(val) + 1;

  208.     if (bits < 9)

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

  210.     else

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

  212. }

  213. 

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

  215. 

  216. // macros for manipulating median values

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

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

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

  220. 

  221. // macros for applying weight

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

  223.     if (samples && in) { \

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

  225.             weight -= delta; \

  226.             if (weight < -1024) \

  227.                 weight = -1024; \

  228.         } else { \

  229.             weight += delta; \

  230.             if (weight > 1024) \

  231.                 weight = 1024; \

  232.         } \

  233.     }

  234. 

  235. 

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

  237. {

  238.     int p, e, res;

  239. 

  240.     if (k < 1)

  241.         return 0;

  242.     p = av_log2(k);

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

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

  245.     if (res >= e)

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

  247.     return res;

  248. }

  249. 

  250. static void update_error_limit(WavpackFrameContext *ctx)

  251. {

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

  253. 

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

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

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

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

  258.     }

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

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

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

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

  263.             br[0] = 0;

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

  265.             br[0] <<= 1;

  266.             br[1] = 0;

  267.         } else {

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

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

  270.         }

  271.     }

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

  273.         if (ctx->hybrid_bitrate) {

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

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

  276.             else

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

  278.         } else {

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

  280.         }

  281.     }

  282. }

  283. 

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

  285.                         int channel, int *last)

  286. {

  287.     int t, t2;

  288.     int sign, base, add, ret;

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

  290. 

  291.     *last = 0;

  292. 

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

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

  295.         if (ctx->zeroes) {

  296.             ctx->zeroes--;

  297.             if (ctx->zeroes) {

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

  299.                 return 0;

  300.             }

  301.         } else {

  302.             t = get_unary_0_33(gb);

  303.             if (t >= 2) {

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

  305.                     goto error;

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

  307.             } else {

  308.                 if (get_bits_left(gb) < 0)

  309.                     goto error;

  310.             }

  311.             ctx->zeroes = t;

  312.             if (ctx->zeroes) {

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

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

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

  316.                 return 0;

  317.             }

  318.         }

  319.     }

  320. 

  321.     if (ctx->zero) {

  322.         t = 0;

  323.         ctx->zero = 0;

  324.     } else {

  325.         t = get_unary_0_33(gb);

  326.         if (get_bits_left(gb) < 0)

  327.             goto error;

  328.         if (t == 16) {

  329.             t2 = get_unary_0_33(gb);

  330.             if (t2 < 2) {

  331.                 if (get_bits_left(gb) < 0)

  332.                     goto error;

  333.                 t += t2;

  334.             } else {

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

  336.                     goto error;

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

  338.             }

  339.         }

  340. 

  341.         if (ctx->one) {

  342.             ctx->one = t & 1;

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

  344.         } else {

  345.             ctx->one = t & 1;

  346.             t >>= 1;

  347.         }

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

  349.     }

  350. 

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

  352.         update_error_limit(ctx);

  353. 

  354.     if (!t) {

  355.         base = 0;

  356.         add  = GET_MED(0) - 1;

  357.         DEC_MED(0);

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

  359.         base = GET_MED(0);

  360.         add  = GET_MED(1) - 1;

  361.         INC_MED(0);

  362.         DEC_MED(1);

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

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

  365.         add  = GET_MED(2) - 1;

  366.         INC_MED(0);

  367.         INC_MED(1);

  368.         DEC_MED(2);

  369.     } else {

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

  371.         add  = GET_MED(2) - 1;

  372.         INC_MED(0);

  373.         INC_MED(1);

  374.         INC_MED(2);

  375.     }

  376.     if (!c->error_limit) {

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

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

  379.             goto error;

  380.     } else {

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

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

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

  384.                 goto error;

  385.             if (get_bits1(gb)) {

  386.                 add -= (mid - base);

  387.                 base = mid;

  388.             } else

  389.                 add = mid - base - 1;

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

  391.         }

  392.         ret = mid;

  393.     }

  394.     sign = get_bits1(gb);

  395.     if (ctx->hybrid_bitrate)

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

  397.     return sign ? ~ret : ret;

  398. 

  399. error:

  400.     *last = 1;

  401.     return 0;

  402. }

  403. 

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

  405.                                        int S)

  406. {

  407.     int bit;

  408. 

  409.     if (s->extra_bits){

  410.         S <<= s->extra_bits;

  411. 

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

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

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

  415.         }

  416.     }

  417. 

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

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

  420. 

  421.     if (s->hybrid)

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

  423. 

  424.     return bit << s->post_shift;

  425. }

  426. 

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

  428. {

  429.     union {

  430.         float    f;

  431.         uint32_t u;

  432.     } value;

  433. 

  434.     unsigned int sign;

  435.     int exp = s->float_max_exp;

  436. 

  437.     if (s->got_extra_bits) {

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

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

  440. 

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

  442.             return 0.0;

  443.     }

  444. 

  445.     if (S) {

  446.         S <<= s->float_shift;

  447.         sign = S < 0;

  448.         if (sign)

  449.             S = -S;

  450.         if (S >= 0x1000000) {

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

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

  453.             else

  454.                 S = 0;

  455.             exp = 255;

  456.         } else if (exp) {

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

  458.             exp = s->float_max_exp;

  459.             if (exp <= shift)

  460.                 shift = --exp;

  461.             exp -= shift;

  462. 

  463.             if (shift) {

  464.                 S <<= shift;

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

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

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

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

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

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

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

  472.                 }

  473.             }

  474.         } else {

  475.             exp = s->float_max_exp;

  476.         }

  477.         S &= 0x7fffff;

  478.     } else {

  479.         sign = 0;

  480.         exp = 0;

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

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

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

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

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

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

  487.             } else {

  488.                 if (s->float_flag & WV_FLT_ZERO_SIGN)

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

  490.             }

  491.         }

  492.     }

  493. 

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

  495. 

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

  497.     return value.f;

  498. }

  499. 

  500. static void wv_reset_saved_context(WavpackFrameContext *s)

  501. {

  502.     s->pos = 0;

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

  504. }

  505. 

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

  507.                                uint32_t crc_extra_bits)

  508. {

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

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

  511.         return AVERROR_INVALIDDATA;

  512.     }

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

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

  515.         return AVERROR_INVALIDDATA;

  516.     }

  517. 

  518.     return 0;

  519. }

  520. 

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

  522.                                    void *dst, const int type)

  523. {

  524.     int i, j, count = 0;

  525.     int last, t;

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

  527.     int pos = s->pos;

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

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

  530.     int16_t *dst16 = dst;

  531.     int32_t *dst32 = dst;

  532.     float   *dstfl = dst;

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

  534. 

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

  536.     do {

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

  538.         if (last)

  539.             break;

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

  541.         if (last)

  542.             break;

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

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

  545.             if (t > 0) {

  546.                 if (t > 8) {

  547.                     if (t & 1) {

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

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

  550.                     } else {

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

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

  553.                     }

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

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

  556.                     j = 0;

  557.                 } else {

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

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

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

  561.                 }

  562.                 if (type != AV_SAMPLE_FMT_S16) {

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

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

  565.                 } else {

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

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

  568.                 }

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

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

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

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

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

  574.                 if (type != AV_SAMPLE_FMT_S16)

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

  576.                 else

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

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

  579.                 L = L2;

  580.                 if (type != AV_SAMPLE_FMT_S16)

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

  582.                 else

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

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

  585.                 R = R2;

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

  587.             } else {

  588.                 if (type != AV_SAMPLE_FMT_S16)

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

  590.                 else

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

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

  593.                 R = R2;

  594. 

  595.                 if (t == -3) {

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

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

  598.                 }

  599. 

  600.                 if (type != AV_SAMPLE_FMT_S16)

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

  602.                 else

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

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

  605.                 L = L2;

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

  607.             }

  608.         }

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

  610.         if (s->joint)

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

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

  613. 

  614.         if (type == AV_SAMPLE_FMT_FLT) {

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

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

  617.             dstfl += channel_pad;

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

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

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

  621.             dst32 += channel_pad;

  622.         } else {

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

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

  625.             dst16 += channel_pad;

  626.         }

  627.         count++;

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

  629. 

  630.     wv_reset_saved_context(s);

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

  632.         wv_check_crc(s, crc, crc_extra_bits))

  633.         return AVERROR_INVALIDDATA;

  634. 

  635.     return count * 2;

  636. }

  637. 

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

  639.                                  void *dst, const int type)

  640. {

  641.     int i, j, count = 0;

  642.     int last, t;

  643.     int A, S, T;

  644.     int pos = s->pos;

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

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

  647.     int16_t *dst16 = dst;

  648.     int32_t *dst32 = dst;

  649.     float   *dstfl = dst;

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

  651. 

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

  653.     do {

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

  655.         S = 0;

  656.         if (last)

  657.             break;

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

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

  660.             if (t > 8) {

  661.                 if (t & 1)

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

  663.                 else

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

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

  666.                 j = 0;

  667.             } else {

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

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

  670.             }

  671.             if (type != AV_SAMPLE_FMT_S16)

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

  673.             else

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

  675.             if (A && T)

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

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

  678.         }

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

  680.         crc = crc * 3 + S;

  681. 

  682.         if (type == AV_SAMPLE_FMT_FLT) {

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

  684.             dstfl += channel_stride;

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

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

  687.             dst32 += channel_stride;

  688.         } else {

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

  690.             dst16 += channel_stride;

  691.         }

  692.         count++;

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

  694. 

  695.     wv_reset_saved_context(s);

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

  697.         wv_check_crc(s, crc, crc_extra_bits))

  698.         return AVERROR_INVALIDDATA;

  699. 

  700.     return count;

  701. }

  702. 

  703. static av_cold int wv_alloc_frame_context(WavpackContext *c)

  704. {

  705. 

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

  707.         return -1;

  708. 

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

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

  711.         return -1;

  712.     c->fdec_num++;

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

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

  715. 

  716.     return 0;

  717. }

  718. 

  719. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  720. {

  721.     WavpackContext *s = avctx->priv_data;

  722. 

  723.     s->avctx = avctx;

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

  725.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  726.     else

  727.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

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

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

  730.                                                          AV_CH_LAYOUT_MONO;

  731. 

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

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

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

  735.     s->mkv_mode = 0;

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

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

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

  739.             s->mkv_mode = 1;

  740.     }

  741. 

  742.     s->fdec_num = 0;

  743. 

  744.     avcodec_get_frame_defaults(&s->frame);

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

  746. 

  747.     return 0;

  748. }

  749. 

  750. static av_cold int wavpack_decode_end(AVCodecContext *avctx)

  751. {

  752.     WavpackContext *s = avctx->priv_data;

  753.     int i;

  754. 

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

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

  757.     s->fdec_num = 0;

  758. 

  759.     return 0;

  760. }

  761. 

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

  763.                                 void *data, int *got_frame_ptr,

  764.                                 const uint8_t *buf, int buf_size)

  765. {

  766.     WavpackContext *wc = avctx->priv_data;

  767.     WavpackFrameContext *s;

  768.     void *samples = data;

  769.     int samplecount;

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

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

  772.     const uint8_t *orig_buf = buf;

  773.     const uint8_t *buf_end  = buf + buf_size;

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

  775.     int bpp, chan, chmask, orig_bpp;

  776. 

  777.     if (buf_size == 0) {

  778.         *got_frame_ptr = 0;

  779.         return 0;

  780.     }

  781. 

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

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

  784.         return -1;

  785.     }

  786. 

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

  788.     if (!s) {

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

  790.         return -1;

  791.     }

  792. 

  793.     if (wc->ch_offset >= avctx->channels) {

  794.         av_log(avctx, AV_LOG_ERROR, "too many channels\n");

  795.         return -1;

  796.     }

  797. 

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

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

  800.     s->extra_bits = 0;

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

  802.     s->got_extra_bits = 0;

  803. 

  804.     if (!wc->mkv_mode) {

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

  806.         if (!s->samples) {

  807.             *got_frame_ptr = 0;

  808.             return 0;

  809.         }

  810.         if (s->samples > wc->samples) {

  811.             av_log(avctx, AV_LOG_ERROR, "too many samples in block");

  812.             return -1;

  813.         }

  814.     } else {

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

  816.     }

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

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

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

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

  821. 

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

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

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

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

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

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

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

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

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

  831.     if (wc->mkv_mode)

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

  833. 

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

  835. 

  836.     // parse metadata blocks

  837.     while (buf < buf_end) {

  838.         id   = *buf++;

  839.         size = *buf++;

  840.         if (id & WP_IDF_LONG) {

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

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

  843.         }

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

  845.         ssize = size;

  846.         if (id & WP_IDF_ODD)

  847.             size--;

  848.         if (size < 0) {

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

  850.             break;

  851.         }

  852.         if (buf + ssize > buf_end) {

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

  854.             break;

  855.         }

  856.         if (id & WP_IDF_IGNORE) {

  857.             buf += ssize;

  858.             continue;

  859.         }

  860.         switch (id & WP_IDF_MASK) {

  861.         case WP_ID_DECTERMS:

  862.             if (size > MAX_TERMS) {

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

  864.                 s->terms = 0;

  865.                 buf += ssize;

  866.                 continue;

  867.             }

  868.             s->terms = size;

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

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

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

  872.                 buf++;

  873.             }

  874.             got_terms = 1;

  875.             break;

  876.         case WP_ID_DECWEIGHTS:

  877.             if (!got_terms) {

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

  879.                 continue;

  880.             }

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

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

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

  884.                 buf += ssize;

  885.                 continue;

  886.             }

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

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

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

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

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

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

  893.                 if (s->stereo_in) {

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

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

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

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

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

  899.                 }

  900.             }

  901.             got_weights = 1;

  902.             break;

  903.         case WP_ID_DECSAMPLES:

  904.             if (!got_terms) {

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

  906.                 continue;

  907.             }

  908.             t = 0;

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

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

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

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

  913.                     if (s->stereo_in) {

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

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

  916.                         t += 4;

  917.                     }

  918.                     t += 4;

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

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

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

  922.                     t += 4;

  923.                 } else {

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

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

  926.                         if (s->stereo_in) {

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

  928.                         }

  929.                     }

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

  931.                 }

  932.             }

  933.             got_samples = 1;

  934.             break;

  935.         case WP_ID_ENTROPY:

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

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

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

  939.                 buf += ssize;

  940.                 continue;

  941.             }

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

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

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

  945.                     buf += 2;

  946.                 }

  947.             }

  948.             got_entropy = 1;

  949.             break;

  950.         case WP_ID_HYBRID:

  951.             if (s->hybrid_bitrate) {

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

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

  954.                     buf += 2;

  955.                     size -= 2;

  956.                 }

  957.             }

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

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

  960.                 buf += 2;

  961.                 size -= 2;

  962.             }

  963.             if (size > 0) {

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

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

  966.                     buf += 2;

  967.                 }

  968.             } else {

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

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

  971.             }

  972.             got_hybrid = 1;

  973.             break;

  974.         case WP_ID_INT32INFO:

  975.             if (size != 4) {

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

  977.                 buf += ssize;

  978.                 continue;

  979.             }

  980.             if (buf[0])

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

  982.             else if (buf[1])

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

  984.             else if (buf[2]){

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

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

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

  988.                 s->and   = 1;

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

  990.             }

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

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

  993.              */

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

  995.                 s->post_shift += 8;

  996.                 s->shift      -= 8;

  997.                 s->hybrid_maxclip >>= 8;

  998.                 s->hybrid_minclip >>= 8;

  999.             }

  1000.             buf += 4;

  1001.             break;

  1002.         case WP_ID_FLOATINFO:

  1003.             if (size != 4) {

  1004.                 av_log(avctx, AV_LOG_ERROR, "Invalid FLOATINFO, size = %i\n", size);

  1005.                 buf += ssize;

  1006.                 continue;

  1007.             }

  1008.             s->float_flag    = buf[0];

  1009.             s->float_shift   = buf[1];

  1010.             s->float_max_exp = buf[2];

  1011.             buf += 4;

  1012.             got_float = 1;

  1013.             break;

  1014.         case WP_ID_DATA:

  1015.             s->sc.offset = buf - orig_buf;

  1016.             s->sc.size   = size * 8;

  1017.             init_get_bits(&s->gb, buf, size * 8);

  1018.             s->data_size = size * 8;

  1019.             buf += size;

  1020.             got_bs = 1;

  1021.             break;

  1022.         case WP_ID_EXTRABITS:

  1023.             if (size <= 4) {

  1024.                 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",

  1025.                        size);

  1026.                 buf += size;

  1027.                 continue;

  1028.             }

  1029.             s->extra_sc.offset = buf - orig_buf;

  1030.             s->extra_sc.size   = size * 8;

  1031.             init_get_bits(&s->gb_extra_bits, buf, size * 8);

  1032.             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);

  1033.             buf += size;

  1034.             s->got_extra_bits = 1;

  1035.             break;

  1036.         case WP_ID_CHANINFO:

  1037.             if (size <= 1) {

  1038.                 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");

  1039.                 return -1;

  1040.             }

  1041.             chan = *buf++;

  1042.             switch (size - 2) {

  1043.             case 0: chmask = *buf;         break;

  1044.             case 1: chmask = AV_RL16(buf); break;

  1045.             case 2: chmask = AV_RL24(buf); break;

  1046.             case 3: chmask = AV_RL32(buf); break;

  1047.             case 5:

  1048.                 chan |= (buf[1] & 0xF) << 8;

  1049.                 chmask = AV_RL24(buf + 2);

  1050.                 break;

  1051.             default:

  1052.                 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",

  1053.                        size);

  1054.                 chan   = avctx->channels;

  1055.                 chmask = avctx->channel_layout;

  1056.             }

  1057.             if (chan != avctx->channels) {

  1058.                 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, "

  1059.                        "decoder believes it's %d channels\n", chan,

  1060.                        avctx->channels);

  1061.                 return -1;

  1062.             }

  1063.             if (!avctx->channel_layout)

  1064.                 avctx->channel_layout = chmask;

  1065.             buf += size - 1;

  1066.             break;

  1067.         default:

  1068.             buf += size;

  1069.         }

  1070.         if (id & WP_IDF_ODD)

  1071.             buf++;

  1072.     }

  1073. 

  1074.     if (!got_terms) {

  1075.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");

  1076.         return -1;

  1077.     }

  1078.     if (!got_weights) {

  1079.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");

  1080.         return -1;

  1081.     }

  1082.     if (!got_samples) {

  1083.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");

  1084.         return -1;

  1085.     }

  1086.     if (!got_entropy) {

  1087.         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");

  1088.         return -1;

  1089.     }

  1090.     if (s->hybrid && !got_hybrid) {

  1091.         av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");

  1092.         return -1;

  1093.     }

  1094.     if (!got_bs) {

  1095.         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");

  1096.         return -1;

  1097.     }

  1098.     if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT) {

  1099.         av_log(avctx, AV_LOG_ERROR, "Float information not found\n");

  1100.         return -1;

  1101.     }

  1102.     if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT) {

  1103.         const int size   = get_bits_left(&s->gb_extra_bits);

  1104.         const int wanted = s->samples * s->extra_bits << s->stereo_in;

  1105.         if (size < wanted) {

  1106.             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");

  1107.             s->got_extra_bits = 0;

  1108.         }

  1109.     }

  1110. 

  1111.     if (s->stereo_in) {

  1112.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1113.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1114.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1115.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1116.         else

  1117.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1118. 

  1119.         if (samplecount < 0)

  1120.             return -1;

  1121. 

  1122.         samplecount >>= 1;

  1123.     } else {

  1124.         const int channel_stride = avctx->channels;

  1125. 

  1126.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1127.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1128.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1129.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1130.         else

  1131.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1132. 

  1133.         if (samplecount < 0)

  1134.             return -1;

  1135. 

  1136.         if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16) {

  1137.             int16_t *dst = (int16_t*)samples + 1;

  1138.             int16_t *src = (int16_t*)samples;

  1139.             int cnt = samplecount;

  1140.             while (cnt--) {

  1141.                 *dst = *src;

  1142.                 src += channel_stride;

  1143.                 dst += channel_stride;

  1144.             }

  1145.         } else if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32) {

  1146.             int32_t *dst = (int32_t*)samples + 1;

  1147.             int32_t *src = (int32_t*)samples;

  1148.             int cnt = samplecount;

  1149.             while (cnt--) {

  1150.                 *dst = *src;

  1151.                 src += channel_stride;

  1152.                 dst += channel_stride;

  1153.             }

  1154.         } else if (s->stereo) {

  1155.             float *dst = (float*)samples + 1;

  1156.             float *src = (float*)samples;

  1157.             int cnt = samplecount;

  1158.             while (cnt--) {

  1159.                 *dst = *src;

  1160.                 src += channel_stride;

  1161.                 dst += channel_stride;

  1162.             }

  1163.         }

  1164.     }

  1165. 

  1166.     *got_frame_ptr = 1;

  1167. 

  1168.     return samplecount * bpp;

  1169. }

  1170. 

  1171. static void wavpack_decode_flush(AVCodecContext *avctx)

  1172. {

  1173.     WavpackContext *s = avctx->priv_data;

  1174.     int i;

  1175. 

  1176.     for (i = 0; i < s->fdec_num; i++)

  1177.         wv_reset_saved_context(s->fdec[i]);

  1178. }

  1179. 

  1180. static int wavpack_decode_frame(AVCodecContext *avctx, void *data,

  1181.                                 int *got_frame_ptr, AVPacket *avpkt)

  1182. {

  1183.     WavpackContext *s  = avctx->priv_data;

  1184.     const uint8_t *buf = avpkt->data;

  1185.     int buf_size       = avpkt->size;

  1186.     int frame_size, ret, frame_flags;

  1187.     int samplecount = 0;

  1188. 

  1189.     s->block     = 0;

  1190.     s->ch_offset = 0;

  1191. 

  1192.     /* determine number of samples */

  1193.     if (s->mkv_mode) {

  1194.         s->samples  = AV_RL32(buf); buf += 4;

  1195.         frame_flags = AV_RL32(buf);

  1196.     } else {

  1197.         if (s->multichannel) {

  1198.             s->samples  = AV_RL32(buf + 4);

  1199.             frame_flags = AV_RL32(buf + 8);

  1200.         } else {

  1201.             s->samples  = AV_RL32(buf);

  1202.             frame_flags = AV_RL32(buf + 4);

  1203.         }

  1204.     }

  1205.     if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) {

  1206.         av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",

  1207.                s->samples);

  1208.         return AVERROR(EINVAL);

  1209.     }

  1210. 

  1211.     if (frame_flags & 0x80) {

  1212.         avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

  1213.     } else if ((frame_flags & 0x03) <= 1) {

  1214.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  1215.     } else {

  1216.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

  1217.         avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;

  1218.     }

  1219. 

  1220.     /* get output buffer */

  1221.     s->frame.nb_samples = s->samples + 1;

  1222.     if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {

  1223.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1224.         return ret;

  1225.     }

  1226.     s->frame.nb_samples = s->samples;

  1227. 

  1228.     while (buf_size > 0) {

  1229.         if (!s->multichannel) {

  1230.             frame_size = buf_size;

  1231.         } else {

  1232.             if (!s->mkv_mode) {

  1233.                 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;

  1234.             } else {

  1235.                 if (buf_size < 12) //MKV files can have zero flags after last block

  1236.                     break;

  1237.                 frame_size = AV_RL32(buf + 8) + 12;

  1238.             }

  1239.         }

  1240.         if (frame_size < 0 || frame_size > buf_size) {

  1241.             av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d "

  1242.                    "vs. %d bytes left)\n", s->block, frame_size, buf_size);

  1243.             wavpack_decode_flush(avctx);

  1244.             return AVERROR_INVALIDDATA;

  1245.         }

  1246.         if ((samplecount = wavpack_decode_block(avctx, s->block,

  1247.                                                 s->frame.data[0], got_frame_ptr,

  1248.                                                 buf, frame_size)) < 0) {

  1249.             wavpack_decode_flush(avctx);

  1250.             return AVERROR_INVALIDDATA;

  1251.         }

  1252.         s->block++;

  1253.         buf += frame_size; buf_size -= frame_size;

  1254.     }

  1255. 

  1256.     if (*got_frame_ptr)

  1257.         *(AVFrame *)data = s->frame;

  1258. 

  1259.     return avpkt->size;

  1260. }

  1261. 

  1262. AVCodec ff_wavpack_decoder = {

  1263.     .name           = "wavpack",

  1264.     .type           = AVMEDIA_TYPE_AUDIO,

  1265.     .id             = AV_CODEC_ID_WAVPACK,

  1266.     .priv_data_size = sizeof(WavpackContext),

  1267.     .init           = wavpack_decode_init,

  1268.     .close          = wavpack_decode_end,

  1269.     .decode         = wavpack_decode_frame,

  1270.     .flush          = wavpack_decode_flush,

  1271.     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,

  1272.     .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),

  1273. };