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FFmpeg/libavcodec/wavpack.c

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  1. /*

  2.  * WavPack lossless audio decoder

  3.  * Copyright (c) 2006,2011 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #define BITSTREAM_READER_LE

  23. 

  24. #include "libavutil/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. enum WP_ID_Flags {

  51.     WP_IDF_MASK   = 0x1F,

  52.     WP_IDF_IGNORE = 0x20,

  53.     WP_IDF_ODD    = 0x40,

  54.     WP_IDF_LONG   = 0x80

  55. };

  56. 

  57. enum WP_ID {

  58.     WP_ID_DUMMY = 0,

  59.     WP_ID_ENCINFO,

  60.     WP_ID_DECTERMS,

  61.     WP_ID_DECWEIGHTS,

  62.     WP_ID_DECSAMPLES,

  63.     WP_ID_ENTROPY,

  64.     WP_ID_HYBRID,

  65.     WP_ID_SHAPING,

  66.     WP_ID_FLOATINFO,

  67.     WP_ID_INT32INFO,

  68.     WP_ID_DATA,

  69.     WP_ID_CORR,

  70.     WP_ID_EXTRABITS,

  71.     WP_ID_CHANINFO

  72. };

  73. 

  74. typedef struct SavedContext {

  75.     int offset;

  76.     int size;

  77.     int bits_used;

  78.     uint32_t crc;

  79. } SavedContext;

  80. 

  81. #define MAX_TERMS 16

  82. 

  83. typedef struct Decorr {

  84.     int delta;

  85.     int value;

  86.     int weightA;

  87.     int weightB;

  88.     int samplesA[8];

  89.     int samplesB[8];

  90. } Decorr;

  91. 

  92. typedef struct WvChannel {

  93.     int median[3];

  94.     int slow_level, error_limit;

  95.     int bitrate_acc, bitrate_delta;

  96. } WvChannel;

  97. 

  98. typedef struct WavpackFrameContext {

  99.     AVCodecContext *avctx;

  100.     int frame_flags;

  101.     int stereo, stereo_in;

  102.     int joint;

  103.     uint32_t CRC;

  104.     GetBitContext gb;

  105.     int got_extra_bits;

  106.     uint32_t crc_extra_bits;

  107.     GetBitContext gb_extra_bits;

  108.     int data_size; // in bits

  109.     int samples;

  110.     int terms;

  111.     Decorr decorr[MAX_TERMS];

  112.     int zero, one, zeroes;

  113.     int extra_bits;

  114.     int and, or, shift;

  115.     int post_shift;

  116.     int hybrid, hybrid_bitrate;

  117.     int hybrid_maxclip, hybrid_minclip;

  118.     int float_flag;

  119.     int float_shift;

  120.     int float_max_exp;

  121.     WvChannel ch[2];

  122.     int pos;

  123.     SavedContext sc, extra_sc;

  124. } WavpackFrameContext;

  125. 

  126. #define WV_MAX_FRAME_DECODERS 14

  127. 

  128. typedef struct WavpackContext {

  129.     AVCodecContext *avctx;

  130.     AVFrame frame;

  131. 

  132.     WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];

  133.     int fdec_num;

  134. 

  135.     int multichannel;

  136.     int mkv_mode;

  137.     int block;

  138.     int samples;

  139.     int ch_offset;

  140. } WavpackContext;

  141. 

  142. // exponent table copied from WavPack source

  143. static const uint8_t wp_exp2_table [256] = {

  144.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,

  145.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,

  146.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,

  147.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,

  148.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,

  149.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,

  150.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,

  151.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  152.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  153.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,

  154.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,

  155.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,

  156.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,

  157.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,

  158.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,

  159.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff

  160. };

  161. 

  162. static const uint8_t wp_log2_table [] = {

  163.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,

  164.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,

  165.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,

  166.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,

  167.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,

  168.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,

  169.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,

  170.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,

  171.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,

  172.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,

  173.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,

  174.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,

  175.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,

  176.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,

  177.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,

  178.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff

  179. };

  180. 

  181. static av_always_inline int wp_exp2(int16_t val)

  182. {

  183.     int res, neg = 0;

  184. 

  185.     if (val < 0) {

  186.         val = -val;

  187.         neg = 1;

  188.     }

  189. 

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

  191.     val >>= 8;

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

  193.     return neg ? -res : res;

  194. }

  195. 

  196. static av_always_inline int wp_log2(int32_t val)

  197. {

  198.     int bits;

  199. 

  200.     if (!val)

  201.         return 0;

  202.     if (val == 1)

  203.         return 256;

  204.     val += val >> 9;

  205.     bits = av_log2(val) + 1;

  206.     if (bits < 9)

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

  208.     else

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

  210. }

  211. 

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

  213. 

  214. // macros for manipulating median values

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

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

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

  218. 

  219. // macros for applying weight

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

  221.     if (samples && in) { \

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

  223.             weight -= delta; \

  224.             if (weight < -1024) \

  225.                 weight = -1024; \

  226.         } else { \

  227.             weight += delta; \

  228.             if (weight > 1024) \

  229.                 weight = 1024; \

  230.         } \

  231.     }

  232. 

  233. 

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

  235. {

  236.     int p, e, res;

  237. 

  238.     if (k < 1)

  239.         return 0;

  240.     p = av_log2(k);

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

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

  243.     if (res >= e)

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

  245.     return res;

  246. }

  247. 

  248. static void update_error_limit(WavpackFrameContext *ctx)

  249. {

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

  251. 

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

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

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

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

  256.     }

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

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

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

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

  261.             br[0] = 0;

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

  263.             br[0] <<= 1;

  264.             br[1] = 0;

  265.         } else {

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

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

  268.         }

  269.     }

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

  271.         if (ctx->hybrid_bitrate) {

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

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

  274.             else

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

  276.         } else {

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

  278.         }

  279.     }

  280. }

  281. 

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

  283.                         int channel, int *last)

  284. {

  285.     int t, t2;

  286.     int sign, base, add, ret;

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

  288. 

  289.     *last = 0;

  290. 

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

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

  293.         if (ctx->zeroes) {

  294.             ctx->zeroes--;

  295.             if (ctx->zeroes) {

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

  297.                 return 0;

  298.             }

  299.         } else {

  300.             t = get_unary_0_33(gb);

  301.             if (t >= 2) {

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

  303.                     goto error;

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

  305.             } else {

  306.                 if (get_bits_left(gb) < 0)

  307.                     goto error;

  308.             }

  309.             ctx->zeroes = t;

  310.             if (ctx->zeroes) {

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

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

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

  314.                 return 0;

  315.             }

  316.         }

  317.     }

  318. 

  319.     if (ctx->zero) {

  320.         t = 0;

  321.         ctx->zero = 0;

  322.     } else {

  323.         t = get_unary_0_33(gb);

  324.         if (get_bits_left(gb) < 0)

  325.             goto error;

  326.         if (t == 16) {

  327.             t2 = get_unary_0_33(gb);

  328.             if (t2 < 2) {

  329.                 if (get_bits_left(gb) < 0)

  330.                     goto error;

  331.                 t += t2;

  332.             } else {

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

  334.                     goto error;

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

  336.             }

  337.         }

  338. 

  339.         if (ctx->one) {

  340.             ctx->one = t & 1;

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

  342.         } else {

  343.             ctx->one = t & 1;

  344.             t >>= 1;

  345.         }

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

  347.     }

  348. 

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

  350.         update_error_limit(ctx);

  351. 

  352.     if (!t) {

  353.         base = 0;

  354.         add  = GET_MED(0) - 1;

  355.         DEC_MED(0);

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

  357.         base = GET_MED(0);

  358.         add  = GET_MED(1) - 1;

  359.         INC_MED(0);

  360.         DEC_MED(1);

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

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

  363.         add  = GET_MED(2) - 1;

  364.         INC_MED(0);

  365.         INC_MED(1);

  366.         DEC_MED(2);

  367.     } else {

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

  369.         add  = GET_MED(2) - 1;

  370.         INC_MED(0);

  371.         INC_MED(1);

  372.         INC_MED(2);

  373.     }

  374.     if (!c->error_limit) {

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

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

  377.             goto error;

  378.     } else {

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

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

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

  382.                 goto error;

  383.             if (get_bits1(gb)) {

  384.                 add -= (mid - base);

  385.                 base = mid;

  386.             } else

  387.                 add = mid - base - 1;

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

  389.         }

  390.         ret = mid;

  391.     }

  392.     sign = get_bits1(gb);

  393.     if (ctx->hybrid_bitrate)

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

  395.     return sign ? ~ret : ret;

  396. 

  397. error:

  398.     *last = 1;

  399.     return 0;

  400. }

  401. 

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

  403.                                        int S)

  404. {

  405.     int bit;

  406. 

  407.     if (s->extra_bits){

  408.         S <<= s->extra_bits;

  409. 

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

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

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

  413.         }

  414.     }

  415. 

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

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

  418. 

  419.     if (s->hybrid)

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

  421. 

  422.     return bit << s->post_shift;

  423. }

  424. 

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

  426. {

  427.     union {

  428.         float    f;

  429.         uint32_t u;

  430.     } value;

  431. 

  432.     unsigned int sign;

  433.     int exp = s->float_max_exp;

  434. 

  435.     if (s->got_extra_bits) {

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

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

  438. 

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

  440.             return 0.0;

  441.     }

  442. 

  443.     if (S) {

  444.         S <<= s->float_shift;

  445.         sign = S < 0;

  446.         if (sign)

  447.             S = -S;

  448.         if (S >= 0x1000000) {

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

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

  451.             else

  452.                 S = 0;

  453.             exp = 255;

  454.         } else if (exp) {

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

  456.             exp = s->float_max_exp;

  457.             if (exp <= shift)

  458.                 shift = --exp;

  459.             exp -= shift;

  460. 

  461.             if (shift) {

  462.                 S <<= shift;

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

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

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

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

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

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

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

  470.                 }

  471.             }

  472.         } else {

  473.             exp = s->float_max_exp;

  474.         }

  475.         S &= 0x7fffff;

  476.     } else {

  477.         sign = 0;

  478.         exp = 0;

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

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

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

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

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

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

  485.             } else {

  486.                 if (s->float_flag & WV_FLT_ZERO_SIGN)

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

  488.             }

  489.         }

  490.     }

  491. 

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

  493. 

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

  495.     return value.f;

  496. }

  497. 

  498. static void wv_reset_saved_context(WavpackFrameContext *s)

  499. {

  500.     s->pos = 0;

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

  502. }

  503. 

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

  505.                                uint32_t crc_extra_bits)

  506. {

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

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

  509.         return AVERROR_INVALIDDATA;

  510.     }

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

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

  513.         return AVERROR_INVALIDDATA;

  514.     }

  515. 

  516.     return 0;

  517. }

  518. 

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

  520.                                    void *dst, const int type)

  521. {

  522.     int i, j, count = 0;

  523.     int last, t;

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

  525.     int pos = s->pos;

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

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

  528.     int16_t *dst16 = dst;

  529.     int32_t *dst32 = dst;

  530.     float   *dstfl = dst;

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

  532. 

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

  534.     do {

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

  536.         if (last)

  537.             break;

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

  539.         if (last)

  540.             break;

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

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

  543.             if (t > 0) {

  544.                 if (t > 8) {

  545.                     if (t & 1) {

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

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

  548.                     } else {

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

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

  551.                     }

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

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

  554.                     j = 0;

  555.                 } else {

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

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

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

  559.                 }

  560.                 if (type != AV_SAMPLE_FMT_S16) {

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

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

  563.                 } else {

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

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

  566.                 }

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

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

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

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

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

  572.                 if (type != AV_SAMPLE_FMT_S16)

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

  574.                 else

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

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

  577.                 L = L2;

  578.                 if (type != AV_SAMPLE_FMT_S16)

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

  580.                 else

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

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

  583.                 R = R2;

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

  585.             } else {

  586.                 if (type != AV_SAMPLE_FMT_S16)

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

  588.                 else

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

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

  591.                 R = R2;

  592. 

  593.                 if (t == -3) {

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

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

  596.                 }

  597. 

  598.                 if (type != AV_SAMPLE_FMT_S16)

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

  600.                 else

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

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

  603.                 L = L2;

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

  605.             }

  606.         }

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

  608.         if (s->joint)

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

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

  611. 

  612.         if (type == AV_SAMPLE_FMT_FLT) {

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

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

  615.             dstfl += channel_pad;

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

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

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

  619.             dst32 += channel_pad;

  620.         } else {

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

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

  623.             dst16 += channel_pad;

  624.         }

  625.         count++;

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

  627. 

  628.     wv_reset_saved_context(s);

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

  630.         wv_check_crc(s, crc, crc_extra_bits))

  631.         return AVERROR_INVALIDDATA;

  632. 

  633.     return count * 2;

  634. }

  635. 

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

  637.                                  void *dst, const int type)

  638. {

  639.     int i, j, count = 0;

  640.     int last, t;

  641.     int A, S, T;

  642.     int pos = s->pos;

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

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

  645.     int16_t *dst16 = dst;

  646.     int32_t *dst32 = dst;

  647.     float   *dstfl = dst;

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

  649. 

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

  651.     do {

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

  653.         S = 0;

  654.         if (last)

  655.             break;

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

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

  658.             if (t > 8) {

  659.                 if (t & 1)

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

  661.                 else

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

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

  664.                 j = 0;

  665.             } else {

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

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

  668.             }

  669.             if (type != AV_SAMPLE_FMT_S16)

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

  671.             else

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

  673.             if (A && T)

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

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

  676.         }

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

  678.         crc = crc * 3 + S;

  679. 

  680.         if (type == AV_SAMPLE_FMT_FLT) {

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

  682.             dstfl += channel_stride;

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

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

  685.             dst32 += channel_stride;

  686.         } else {

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

  688.             dst16 += channel_stride;

  689.         }

  690.         count++;

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

  692. 

  693.     wv_reset_saved_context(s);

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

  695.         wv_check_crc(s, crc, crc_extra_bits))

  696.         return AVERROR_INVALIDDATA;

  697. 

  698.     return count;

  699. }

  700. 

  701. static av_cold int wv_alloc_frame_context(WavpackContext *c)

  702. {

  703. 

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

  705.         return -1;

  706. 

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

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

  709.         return -1;

  710.     c->fdec_num++;

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

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

  713. 

  714.     return 0;

  715. }

  716. 

  717. static av_cold int wavpack_decode_init(AVCodecContext *avctx)

  718. {

  719.     WavpackContext *s = avctx->priv_data;

  720. 

  721.     s->avctx = avctx;

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

  723.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  724.     else

  725.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

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

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

  728.                                                          AV_CH_LAYOUT_MONO;

  729. 

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

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

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

  733.     s->mkv_mode = 0;

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

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

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

  737.             s->mkv_mode = 1;

  738.     }

  739. 

  740.     s->fdec_num = 0;

  741. 

  742.     avcodec_get_frame_defaults(&s->frame);

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

  744. 

  745.     return 0;

  746. }

  747. 

  748. static av_cold int wavpack_decode_end(AVCodecContext *avctx)

  749. {

  750.     WavpackContext *s = avctx->priv_data;

  751.     int i;

  752. 

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

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

  755.     s->fdec_num = 0;

  756. 

  757.     return 0;

  758. }

  759. 

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

  761.                                 void *data, int *got_frame_ptr,

  762.                                 const uint8_t *buf, int buf_size)

  763. {

  764.     WavpackContext *wc = avctx->priv_data;

  765.     WavpackFrameContext *s;

  766.     void *samples = data;

  767.     int samplecount;

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

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

  770.     const uint8_t *orig_buf = buf;

  771.     const uint8_t *buf_end  = buf + buf_size;

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

  773.     int bpp, chan, chmask, orig_bpp;

  774. 

  775.     if (buf_size == 0) {

  776.         *got_frame_ptr = 0;

  777.         return 0;

  778.     }

  779. 

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

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

  782.         return -1;

  783.     }

  784. 

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

  786.     if (!s) {

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

  788.         return -1;

  789.     }

  790. 

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

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

  793.     s->extra_bits = 0;

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

  795.     s->got_extra_bits = 0;

  796. 

  797.     if (!wc->mkv_mode) {

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

  799.         if (!s->samples) {

  800.             *got_frame_ptr = 0;

  801.             return 0;

  802.         }

  803.     } else {

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

  805.     }

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

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

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

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

  810. 

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

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

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

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

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

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

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

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

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

  820.     if (wc->mkv_mode)

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

  822. 

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

  824. 

  825.     // parse metadata blocks

  826.     while (buf < buf_end) {

  827.         id   = *buf++;

  828.         size = *buf++;

  829.         if (id & WP_IDF_LONG) {

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

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

  832.         }

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

  834.         ssize = size;

  835.         if (id & WP_IDF_ODD)

  836.             size--;

  837.         if (size < 0) {

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

  839.             break;

  840.         }

  841.         if (buf + ssize > buf_end) {

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

  843.             break;

  844.         }

  845.         if (id & WP_IDF_IGNORE) {

  846.             buf += ssize;

  847.             continue;

  848.         }

  849.         switch (id & WP_IDF_MASK) {

  850.         case WP_ID_DECTERMS:

  851.             if (size > MAX_TERMS) {

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

  853.                 s->terms = 0;

  854.                 buf += ssize;

  855.                 continue;

  856.             }

  857.             s->terms = size;

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

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

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

  861.                 buf++;

  862.             }

  863.             got_terms = 1;

  864.             break;

  865.         case WP_ID_DECWEIGHTS:

  866.             if (!got_terms) {

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

  868.                 continue;

  869.             }

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

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

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

  873.                 buf += ssize;

  874.                 continue;

  875.             }

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

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

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

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

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

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

  882.                 if (s->stereo_in) {

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

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

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

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

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

  888.                 }

  889.             }

  890.             got_weights = 1;

  891.             break;

  892.         case WP_ID_DECSAMPLES:

  893.             if (!got_terms) {

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

  895.                 continue;

  896.             }

  897.             t = 0;

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

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

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

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

  902.                     if (s->stereo_in) {

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

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

  905.                         t += 4;

  906.                     }

  907.                     t += 4;

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

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

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

  911.                     t += 4;

  912.                 } else {

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

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

  915.                         if (s->stereo_in) {

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

  917.                         }

  918.                     }

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

  920.                 }

  921.             }

  922.             got_samples = 1;

  923.             break;

  924.         case WP_ID_ENTROPY:

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

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

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

  928.                 buf += ssize;

  929.                 continue;

  930.             }

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

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

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

  934.                     buf += 2;

  935.                 }

  936.             }

  937.             got_entropy = 1;

  938.             break;

  939.         case WP_ID_HYBRID:

  940.             if (s->hybrid_bitrate) {

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

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

  943.                     buf += 2;

  944.                     size -= 2;

  945.                 }

  946.             }

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

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

  949.                 buf += 2;

  950.                 size -= 2;

  951.             }

  952.             if (size > 0) {

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

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

  955.                     buf += 2;

  956.                 }

  957.             } else {

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

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

  960.             }

  961.             got_hybrid = 1;

  962.             break;

  963.         case WP_ID_INT32INFO:

  964.             if (size != 4) {

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

  966.                 buf += ssize;

  967.                 continue;

  968.             }

  969.             if (buf[0])

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

  971.             else if (buf[1])

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

  973.             else if (buf[2]){

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

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

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

  977.                 s->and   = 1;

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

  979.             }

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

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

  982.              */

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

  984.                 s->post_shift += 8;

  985.                 s->shift      -= 8;

  986.                 s->hybrid_maxclip >>= 8;

  987.                 s->hybrid_minclip >>= 8;

  988.             }

  989.             buf += 4;

  990.             break;

  991.         case WP_ID_FLOATINFO:

  992.             if (size != 4) {

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

  994.                 buf += ssize;

  995.                 continue;

  996.             }

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

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

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

  1000.             buf += 4;

  1001.             got_float = 1;

  1002.             break;

  1003.         case WP_ID_DATA:

  1004.             s->sc.offset = buf - orig_buf;

  1005.             s->sc.size   = size * 8;

  1006.             init_get_bits(&s->gb, buf, size * 8);

  1007.             s->data_size = size * 8;

  1008.             buf += size;

  1009.             got_bs = 1;

  1010.             break;

  1011.         case WP_ID_EXTRABITS:

  1012.             if (size <= 4) {

  1013.                 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",

  1014.                        size);

  1015.                 buf += size;

  1016.                 continue;

  1017.             }

  1018.             s->extra_sc.offset = buf - orig_buf;

  1019.             s->extra_sc.size   = size * 8;

  1020.             init_get_bits(&s->gb_extra_bits, buf, size * 8);

  1021.             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);

  1022.             buf += size;

  1023.             s->got_extra_bits = 1;

  1024.             break;

  1025.         case WP_ID_CHANINFO:

  1026.             if (size <= 1) {

  1027.                 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");

  1028.                 return -1;

  1029.             }

  1030.             chan = *buf++;

  1031.             switch (size - 2) {

  1032.             case 0: chmask = *buf;         break;

  1033.             case 1: chmask = AV_RL16(buf); break;

  1034.             case 2: chmask = AV_RL24(buf); break;

  1035.             case 3: chmask = AV_RL32(buf); break;

  1036.             case 5:

  1037.                 chan |= (buf[1] & 0xF) << 8;

  1038.                 chmask = AV_RL24(buf + 2);

  1039.                 break;

  1040.             default:

  1041.                 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",

  1042.                        size);

  1043.                 chan   = avctx->channels;

  1044.                 chmask = avctx->channel_layout;

  1045.             }

  1046.             if (chan != avctx->channels) {

  1047.                 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, "

  1048.                        "decoder believes it's %d channels\n", chan,

  1049.                        avctx->channels);

  1050.                 return -1;

  1051.             }

  1052.             if (!avctx->channel_layout)

  1053.                 avctx->channel_layout = chmask;

  1054.             buf += size - 1;

  1055.             break;

  1056.         default:

  1057.             buf += size;

  1058.         }

  1059.         if (id & WP_IDF_ODD)

  1060.             buf++;

  1061.     }

  1062. 

  1063.     if (!got_terms) {

  1064.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");

  1065.         return -1;

  1066.     }

  1067.     if (!got_weights) {

  1068.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");

  1069.         return -1;

  1070.     }

  1071.     if (!got_samples) {

  1072.         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");

  1073.         return -1;

  1074.     }

  1075.     if (!got_entropy) {

  1076.         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");

  1077.         return -1;

  1078.     }

  1079.     if (s->hybrid && !got_hybrid) {

  1080.         av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");

  1081.         return -1;

  1082.     }

  1083.     if (!got_bs) {

  1084.         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");

  1085.         return -1;

  1086.     }

  1087.     if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT) {

  1088.         av_log(avctx, AV_LOG_ERROR, "Float information not found\n");

  1089.         return -1;

  1090.     }

  1091.     if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT) {

  1092.         const int size   = get_bits_left(&s->gb_extra_bits);

  1093.         const int wanted = s->samples * s->extra_bits << s->stereo_in;

  1094.         if (size < wanted) {

  1095.             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");

  1096.             s->got_extra_bits = 0;

  1097.         }

  1098.     }

  1099. 

  1100.     if (s->stereo_in) {

  1101.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1102.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1103.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1104.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1105.         else

  1106.             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1107. 

  1108.         if (samplecount < 0)

  1109.             return -1;

  1110. 

  1111.         samplecount >>= 1;

  1112.     } else {

  1113.         const int channel_stride = avctx->channels;

  1114. 

  1115.         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)

  1116.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);

  1117.         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)

  1118.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);

  1119.         else

  1120.             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);

  1121. 

  1122.         if (samplecount < 0)

  1123.             return -1;

  1124. 

  1125.         if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16) {

  1126.             int16_t *dst = (int16_t*)samples + 1;

  1127.             int16_t *src = (int16_t*)samples;

  1128.             int cnt = samplecount;

  1129.             while (cnt--) {

  1130.                 *dst = *src;

  1131.                 src += channel_stride;

  1132.                 dst += channel_stride;

  1133.             }

  1134.         } else if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32) {

  1135.             int32_t *dst = (int32_t*)samples + 1;

  1136.             int32_t *src = (int32_t*)samples;

  1137.             int cnt = samplecount;

  1138.             while (cnt--) {

  1139.                 *dst = *src;

  1140.                 src += channel_stride;

  1141.                 dst += channel_stride;

  1142.             }

  1143.         } else if (s->stereo) {

  1144.             float *dst = (float*)samples + 1;

  1145.             float *src = (float*)samples;

  1146.             int cnt = samplecount;

  1147.             while (cnt--) {

  1148.                 *dst = *src;

  1149.                 src += channel_stride;

  1150.                 dst += channel_stride;

  1151.             }

  1152.         }

  1153.     }

  1154. 

  1155.     *got_frame_ptr = 1;

  1156. 

  1157.     return samplecount * bpp;

  1158. }

  1159. 

  1160. static void wavpack_decode_flush(AVCodecContext *avctx)

  1161. {

  1162.     WavpackContext *s = avctx->priv_data;

  1163.     int i;

  1164. 

  1165.     for (i = 0; i < s->fdec_num; i++)

  1166.         wv_reset_saved_context(s->fdec[i]);

  1167. }

  1168. 

  1169. static int wavpack_decode_frame(AVCodecContext *avctx, void *data,

  1170.                                 int *got_frame_ptr, AVPacket *avpkt)

  1171. {

  1172.     WavpackContext *s  = avctx->priv_data;

  1173.     const uint8_t *buf = avpkt->data;

  1174.     int buf_size       = avpkt->size;

  1175.     int frame_size, ret, frame_flags;

  1176.     int samplecount = 0;

  1177. 

  1178.     s->block     = 0;

  1179.     s->ch_offset = 0;

  1180. 

  1181.     /* determine number of samples */

  1182.     if (s->mkv_mode) {

  1183.         s->samples  = AV_RL32(buf); buf += 4;

  1184.         frame_flags = AV_RL32(buf);

  1185.     } else {

  1186.         if (s->multichannel) {

  1187.             s->samples  = AV_RL32(buf + 4);

  1188.             frame_flags = AV_RL32(buf + 8);

  1189.         } else {

  1190.             s->samples  = AV_RL32(buf);

  1191.             frame_flags = AV_RL32(buf + 4);

  1192.         }

  1193.     }

  1194.     if (s->samples <= 0) {

  1195.         av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",

  1196.                s->samples);

  1197.         return AVERROR(EINVAL);

  1198.     }

  1199. 

  1200.     if (frame_flags & 0x80) {

  1201.         avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

  1202.     } else if ((frame_flags & 0x03) <= 1) {

  1203.         avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  1204.     } else {

  1205.         avctx->sample_fmt = AV_SAMPLE_FMT_S32;

  1206.         avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;

  1207.     }

  1208. 

  1209.     /* get output buffer */

  1210.     s->frame.nb_samples = s->samples;

  1211.     if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {

  1212.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1213.         return ret;

  1214.     }

  1215. 

  1216.     while (buf_size > 0) {

  1217.         if (!s->multichannel) {

  1218.             frame_size = buf_size;

  1219.         } else {

  1220.             if (!s->mkv_mode) {

  1221.                 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;

  1222.             } else {

  1223.                 if (buf_size < 12) //MKV files can have zero flags after last block

  1224.                     break;

  1225.                 frame_size = AV_RL32(buf + 8) + 12;

  1226.             }

  1227.         }

  1228.         if (frame_size < 0 || frame_size > buf_size) {

  1229.             av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d "

  1230.                    "vs. %d bytes left)\n", s->block, frame_size, buf_size);

  1231.             wavpack_decode_flush(avctx);

  1232.             return -1;

  1233.         }

  1234.         if ((samplecount = wavpack_decode_block(avctx, s->block,

  1235.                                                 s->frame.data[0], got_frame_ptr,

  1236.                                                 buf, frame_size)) < 0) {

  1237.             wavpack_decode_flush(avctx);

  1238.             return -1;

  1239.         }

  1240.         s->block++;

  1241.         buf += frame_size; buf_size -= frame_size;

  1242.     }

  1243. 

  1244.     if (*got_frame_ptr)

  1245.         *(AVFrame *)data = s->frame;

  1246. 

  1247.     return avpkt->size;

  1248. }

  1249. 

  1250. AVCodec ff_wavpack_decoder = {

  1251.     .name           = "wavpack",

  1252.     .type           = AVMEDIA_TYPE_AUDIO,

  1253.     .id             = AV_CODEC_ID_WAVPACK,

  1254.     .priv_data_size = sizeof(WavpackContext),

  1255.     .init           = wavpack_decode_init,

  1256.     .close          = wavpack_decode_end,

  1257.     .decode         = wavpack_decode_frame,

  1258.     .flush          = wavpack_decode_flush,

  1259.     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,

  1260.     .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),

  1261. };