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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/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_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,

  504.                                    void *dst, const int type)

  505. {

  506.     int i, j, count = 0;

  507.     int last, t;

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

  509.     int pos = s->pos;

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

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

  512.     int16_t *dst16 = dst;

  513.     int32_t *dst32 = dst;

  514.     float   *dstfl = dst;

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

  516. 

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

  518.     do {

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

  520.         if (last)

  521.             break;

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

  523.         if (last)

  524.             break;

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

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

  527.             if (t > 0) {

  528.                 if (t > 8) {

  529.                     if (t & 1) {

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

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

  532.                     } else {

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

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

  535.                     }

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

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

  538.                     j = 0;

  539.                 } else {

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

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

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

  543.                 }

  544.                 if (type != AV_SAMPLE_FMT_S16) {

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

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

  547.                 } else {

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

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

  550.                 }

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

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

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

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

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

  556.                 if (type != AV_SAMPLE_FMT_S16)

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

  558.                 else

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

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

  561.                 L = L2;

  562.                 if (type != AV_SAMPLE_FMT_S16)

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

  564.                 else

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

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

  567.                 R = R2;

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

  569.             } else {

  570.                 if (type != AV_SAMPLE_FMT_S16)

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

  572.                 else

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

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

  575.                 R = R2;

  576. 

  577.                 if (t == -3) {

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

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

  580.                 }

  581. 

  582.                 if (type != AV_SAMPLE_FMT_S16)

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

  584.                 else

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

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

  587.                 L = L2;

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

  589.             }

  590.         }

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

  592.         if (s->joint)

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

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

  595. 

  596.         if (type == AV_SAMPLE_FMT_FLT) {

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

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

  599.             dstfl += channel_pad;

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

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

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

  603.             dst32 += channel_pad;

  604.         } else {

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

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

  607.             dst16 += channel_pad;

  608.         }

  609.         count++;

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

  611. 

  612.     wv_reset_saved_context(s);

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

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

  615.         return -1;

  616.     }

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

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

  619.         return -1;

  620.     }

  621. 

  622.     return count * 2;

  623. }

  624. 

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

  626.                                  void *dst, const int type)

  627. {

  628.     int i, j, count = 0;

  629.     int last, t;

  630.     int A, S, T;

  631.     int pos = s->pos;

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

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

  634.     int16_t *dst16 = dst;

  635.     int32_t *dst32 = dst;

  636.     float   *dstfl = dst;

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

  638. 

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

  640.     do {

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

  642.         S = 0;

  643.         if (last)

  644.             break;

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

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

  647.             if (t > 8) {

  648.                 if (t & 1)

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

  650.                 else

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

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

  653.                 j = 0;

  654.             } else {

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

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

  657.             }

  658.             if (type != AV_SAMPLE_FMT_S16)

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

  660.             else

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

  662.             if (A && T)

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

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

  665.         }

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

  667.         crc = crc * 3 + S;

  668. 

  669.         if (type == AV_SAMPLE_FMT_FLT) {

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

  671.             dstfl += channel_stride;

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

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

  674.             dst32 += channel_stride;

  675.         } else {

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

  677.             dst16 += channel_stride;

  678.         }

  679.         count++;

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

  681. 

  682.     wv_reset_saved_context(s);

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

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

  685.         return -1;

  686.     }

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

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

  689.         return -1;

  690.     }

  691. 

  692.     return count;

  693. }

  694. 

  695. static av_cold int wv_alloc_frame_context(WavpackContext *c)

  696. {

  697. 

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

  699.         return -1;

  700. 

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

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

  703.         return -1;

  704.     c->fdec_num++;

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

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

  707. 

  708.     return 0;

  709. }

  710. 

  711. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  712. {

  713.     WavpackContext *s = avctx->priv_data;

  714. 

  715.     s->avctx = avctx;

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

  717.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  718.     else

  719.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

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

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

  722.                                                          AV_CH_LAYOUT_MONO;

  723. 

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

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

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

  727.     s->mkv_mode = 0;

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

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

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

  731.             s->mkv_mode = 1;

  732.     }

  733. 

  734.     s->fdec_num = 0;

  735. 

  736.     avcodec_get_frame_defaults(&s->frame);

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

  738. 

  739.     return 0;

  740. }

  741. 

  742. static av_cold int wavpack_decode_end(AVCodecContext *avctx)

  743. {

  744.     WavpackContext *s = avctx->priv_data;

  745.     int i;

  746. 

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

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

  749.     s->fdec_num = 0;

  750. 

  751.     return 0;

  752. }

  753. 

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

  755.                                 void *data, int *got_frame_ptr,

  756.                                 const uint8_t *buf, int buf_size)

  757. {

  758.     WavpackContext *wc = avctx->priv_data;

  759.     WavpackFrameContext *s;

  760.     void *samples = data;

  761.     int samplecount;

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

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

  764.     const uint8_t *orig_buf = buf;

  765.     const uint8_t *buf_end  = buf + buf_size;

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

  767.     int bpp, chan, chmask, orig_bpp;

  768. 

  769.     if (buf_size == 0) {

  770.         *got_frame_ptr = 0;

  771.         return 0;

  772.     }

  773. 

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

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

  776.         return -1;

  777.     }

  778. 

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

  780.     if (!s) {

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

  782.         return -1;

  783.     }

  784. 

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

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

  787.     s->extra_bits = 0;

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

  789.     s->got_extra_bits = 0;

  790. 

  791.     if (!wc->mkv_mode) {

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

  793.         if (!s->samples) {

  794.             *got_frame_ptr = 0;

  795.             return 0;

  796.         }

  797.     } else {

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

  799.     }

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

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

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

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

  804. 

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

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

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

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

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

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

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

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

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

  814.     if (wc->mkv_mode)

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

  816. 

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

  818. 

  819.     // parse metadata blocks

  820.     while (buf < buf_end) {

  821.         id   = *buf++;

  822.         size = *buf++;

  823.         if (id & WP_IDF_LONG) {

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

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

  826.         }

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

  828.         ssize = size;

  829.         if (id & WP_IDF_ODD)

  830.             size--;

  831.         if (size < 0) {

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

  833.             break;

  834.         }

  835.         if (buf + ssize > buf_end) {

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

  837.             break;

  838.         }

  839.         if (id & WP_IDF_IGNORE) {

  840.             buf += ssize;

  841.             continue;

  842.         }

  843.         switch (id & WP_IDF_MASK) {

  844.         case WP_ID_DECTERMS:

  845.             if (size > MAX_TERMS) {

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

  847.                 s->terms = 0;

  848.                 buf += ssize;

  849.                 continue;

  850.             }

  851.             s->terms = size;

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

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

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

  855.                 buf++;

  856.             }

  857.             got_terms = 1;

  858.             break;

  859.         case WP_ID_DECWEIGHTS:

  860.             if (!got_terms) {

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

  862.                 continue;

  863.             }

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

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

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

  867.                 buf += ssize;

  868.                 continue;

  869.             }

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

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

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

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

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

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

  876.                 if (s->stereo_in) {

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

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

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

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

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

  882.                 }

  883.             }

  884.             got_weights = 1;

  885.             break;

  886.         case WP_ID_DECSAMPLES:

  887.             if (!got_terms) {

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

  889.                 continue;

  890.             }

  891.             t = 0;

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

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

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

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

  896.                     if (s->stereo_in) {

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

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

  899.                         t += 4;

  900.                     }

  901.                     t += 4;

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

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

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

  905.                     t += 4;

  906.                 } else {

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

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

  909.                         if (s->stereo_in)

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

  911.                     }

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

  913.                 }

  914.             }

  915.             got_samples = 1;

  916.             break;

  917.         case WP_ID_ENTROPY:

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

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

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

  921.                 buf += ssize;

  922.                 continue;

  923.             }

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

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

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

  927.                     buf += 2;

  928.                 }

  929.             }

  930.             got_entropy = 1;

  931.             break;

  932.         case WP_ID_HYBRID:

  933.             if (s->hybrid_bitrate) {

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

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

  936.                     buf += 2;

  937.                     size -= 2;

  938.                 }

  939.             }

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

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

  942.                 buf += 2;

  943.                 size -= 2;

  944.             }

  945.             if (size > 0) {

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

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

  948.                     buf += 2;

  949.                 }

  950.             } else {

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

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

  953.             }

  954.             got_hybrid = 1;

  955.             break;

  956.         case WP_ID_INT32INFO:

  957.             if (size != 4) {

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

  959.                 buf += ssize;

  960.                 continue;

  961.             }

  962.             if (buf[0])

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

  964.             else if (buf[1])

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

  966.             else if (buf[2]){

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

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

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

  970.                 s->and   = 1;

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

  972.             }

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

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

  975.              */

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

  977.                 s->post_shift += 8;

  978.                 s->shift      -= 8;

  979.                 s->hybrid_maxclip >>= 8;

  980.                 s->hybrid_minclip >>= 8;

  981.             }

  982.             buf += 4;

  983.             break;

  984.         case WP_ID_FLOATINFO:

  985.             if (size != 4) {

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

  987.                 buf += ssize;

  988.                 continue;

  989.             }

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

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

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

  993.             buf += 4;

  994.             got_float = 1;

  995.             break;

  996.         case WP_ID_DATA:

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

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

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

  1000.             s->data_size = size * 8;

  1001.             buf += size;

  1002.             got_bs = 1;

  1003.             break;

  1004.         case WP_ID_EXTRABITS:

  1005.             if (size <= 4) {

  1006.                 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",

  1007.                        size);

  1008.                 buf += size;

  1009.                 continue;

  1010.             }

  1011.             s->extra_sc.offset = buf - orig_buf;

  1012.             s->extra_sc.size   = size * 8;

  1013.             init_get_bits(&s->gb_extra_bits, buf, size * 8);

  1014.             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);

  1015.             buf += size;

  1016.             s->got_extra_bits = 1;

  1017.             break;

  1018.         case WP_ID_CHANINFO:

  1019.             if (size <= 1) {

  1020.                 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");

  1021.                 return -1;

  1022.             }

  1023.             chan = *buf++;

  1024.             switch (size - 2) {

  1025.             case 0: chmask = *buf;         break;

  1026.             case 1: chmask = AV_RL16(buf); break;

  1027.             case 2: chmask = AV_RL24(buf); break;

  1028.             case 3: chmask = AV_RL32(buf); break;

  1029.             case 5:

  1030.                 chan |= (buf[1] & 0xF) << 8;

  1031.                 chmask = AV_RL24(buf + 2);

  1032.                 break;

  1033.             default:

  1034.                 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",

  1035.                        size);

  1036.                 chan   = avctx->channels;

  1037.                 chmask = avctx->channel_layout;

  1038.             }

  1039.             if (chan != avctx->channels) {

  1040.                 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, "

  1041.                        "decoder believes it's %d channels\n", chan,

  1042.                        avctx->channels);

  1043.                 return -1;

  1044.             }

  1045.             if (!avctx->channel_layout)

  1046.                 avctx->channel_layout = chmask;

  1047.             buf += size - 1;

  1048.             break;

  1049.         default:

  1050.             buf += size;

  1051.         }

  1052.         if (id & WP_IDF_ODD)

  1053.             buf++;

  1054.     }

  1055. 

  1056.     if (!got_terms) {

  1057.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");

  1058.         return -1;

  1059.     }

  1060.     if (!got_weights) {

  1061.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");

  1062.         return -1;

  1063.     }

  1064.     if (!got_samples) {

  1065.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");

  1066.         return -1;

  1067.     }

  1068.     if (!got_entropy) {

  1069.         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");

  1070.         return -1;

  1071.     }

  1072.     if (s->hybrid && !got_hybrid) {

  1073.         av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");

  1074.         return -1;

  1075.     }

  1076.     if (!got_bs) {

  1077.         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");

  1078.         return -1;

  1079.     }

  1080.     if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT) {

  1081.         av_log(avctx, AV_LOG_ERROR, "Float information not found\n");

  1082.         return -1;

  1083.     }

  1084.     if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT) {

  1085.         const int size   = get_bits_left(&s->gb_extra_bits);

  1086.         const int wanted = s->samples * s->extra_bits << s->stereo_in;

  1087.         if (size < wanted) {

  1088.             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");

  1089.             s->got_extra_bits = 0;

  1090.         }

  1091.     }

  1092. 

  1093.     if (s->stereo_in) {

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

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

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

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

  1098.         else

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

  1100. 

  1101.         if (samplecount < 0)

  1102.             return -1;

  1103. 

  1104.         samplecount >>= 1;

  1105.     } else {

  1106.         const int channel_stride = avctx->channels;

  1107. 

  1108.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1109.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1110.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1111.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1112.         else

  1113.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1114. 

  1115.         if (samplecount < 0)

  1116.             return -1;

  1117. 

  1118.         if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16) {

  1119.             int16_t *dst = (int16_t*)samples + 1;

  1120.             int16_t *src = (int16_t*)samples;

  1121.             int cnt = samplecount;

  1122.             while (cnt--) {

  1123.                 *dst = *src;

  1124.                 src += channel_stride;

  1125.                 dst += channel_stride;

  1126.             }

  1127.         } else if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32) {

  1128.             int32_t *dst = (int32_t*)samples + 1;

  1129.             int32_t *src = (int32_t*)samples;

  1130.             int cnt = samplecount;

  1131.             while (cnt--) {

  1132.                 *dst = *src;

  1133.                 src += channel_stride;

  1134.                 dst += channel_stride;

  1135.             }

  1136.         } else if (s->stereo) {

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

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

  1139.             int cnt = samplecount;

  1140.             while (cnt--) {

  1141.                 *dst = *src;

  1142.                 src += channel_stride;

  1143.                 dst += channel_stride;

  1144.             }

  1145.         }

  1146.     }

  1147. 

  1148.     *got_frame_ptr = 1;

  1149. 

  1150.     return samplecount * bpp;

  1151. }

  1152. 

  1153. static void wavpack_decode_flush(AVCodecContext *avctx)

  1154. {

  1155.     WavpackContext *s = avctx->priv_data;

  1156.     int i;

  1157. 

  1158.     for (i = 0; i < s->fdec_num; i++)

  1159.         wv_reset_saved_context(s->fdec[i]);

  1160. }

  1161. 

  1162. static int wavpack_decode_frame(AVCodecContext *avctx, void *data,

  1163.                                 int *got_frame_ptr, AVPacket *avpkt)

  1164. {

  1165.     WavpackContext *s  = avctx->priv_data;

  1166.     const uint8_t *buf = avpkt->data;

  1167.     int buf_size       = avpkt->size;

  1168.     int frame_size, ret, frame_flags;

  1169.     int samplecount = 0;

  1170. 

  1171.     s->block     = 0;

  1172.     s->ch_offset = 0;

  1173. 

  1174.     /* determine number of samples */

  1175.     if (s->mkv_mode) {

  1176.         s->samples  = AV_RL32(buf); buf += 4;

  1177.         frame_flags = AV_RL32(buf);

  1178.     } else {

  1179.         if (s->multichannel) {

  1180.             s->samples  = AV_RL32(buf + 4);

  1181.             frame_flags = AV_RL32(buf + 8);

  1182.         } else {

  1183.             s->samples  = AV_RL32(buf);

  1184.             frame_flags = AV_RL32(buf + 4);

  1185.         }

  1186.     }

  1187.     if (s->samples <= 0) {

  1188.         av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",

  1189.                s->samples);

  1190.         return AVERROR(EINVAL);

  1191.     }

  1192. 

  1193.     if (frame_flags & 0x80) {

  1194.         avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

  1195.     } else if ((frame_flags & 0x03) <= 1) {

  1196.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  1197.     } else {

  1198.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

  1199.     }

  1200. 

  1201.     /* get output buffer */

  1202.     s->frame.nb_samples = s->samples;

  1203.     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {

  1204.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1205.         return ret;

  1206.     }

  1207. 

  1208.     while (buf_size > 0) {

  1209.         if (!s->multichannel) {

  1210.             frame_size = buf_size;

  1211.         } else {

  1212.             if (!s->mkv_mode) {

  1213.                 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;

  1214.             } else {

  1215.                 if (buf_size < 12) //MKV files can have zero flags after last block

  1216.                     break;

  1217.                 frame_size = AV_RL32(buf + 8) + 12;

  1218.             }

  1219.         }

  1220.         if (frame_size < 0 || frame_size > buf_size) {

  1221.             av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d "

  1222.                    "vs. %d bytes left)\n", s->block, frame_size, buf_size);

  1223.             wavpack_decode_flush(avctx);

  1224.             return -1;

  1225.         }

  1226.         if ((samplecount = wavpack_decode_block(avctx, s->block,

  1227.                                                 s->frame.data[0], got_frame_ptr,

  1228.                                                 buf, frame_size)) < 0) {

  1229.             wavpack_decode_flush(avctx);

  1230.             return -1;

  1231.         }

  1232.         s->block++;

  1233.         buf += frame_size; buf_size -= frame_size;

  1234.     }

  1235. 

  1236.     if (*got_frame_ptr)

  1237.         *(AVFrame *)data = s->frame;

  1238. 

  1239.     return avpkt->size;

  1240. }

  1241. 

  1242. AVCodec ff_wavpack_decoder = {

  1243.     .name           = "wavpack",

  1244.     .type           = AVMEDIA_TYPE_AUDIO,

  1245.     .id             = CODEC_ID_WAVPACK,

  1246.     .priv_data_size = sizeof(WavpackContext),

  1247.     .init           = wavpack_decode_init,

  1248.     .close          = wavpack_decode_end,

  1249.     .decode         = wavpack_decode_frame,

  1250.     .flush          = wavpack_decode_flush,

  1251.     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,

  1252.     .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),

  1253. };