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  1. /*
  2.  * WavPack decoder/encoder common code
  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. #ifndef AVCODEC_WAVPACK_H
  23. #define AVCODEC_WAVPACK_H
  24.  
  25. #include "libavutil/common.h"
  26.  
  27. #define MAX_TERMS      16
  28. #define MAX_TERM        8
  29.  
  30. #define WV_HEADER_SIZE    32
  31.  
  32. #define WV_MONO           0x00000004
  33. #define WV_JOINT_STEREO   0x00000010
  34. #define WV_CROSS_DECORR   0x00000020
  35. #define WV_FLOAT_DATA     0x00000080
  36. #define WV_INT32_DATA     0x00000100
  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. #define WV_INITIAL_BLOCK  0x00000800
  44. #define WV_FINAL_BLOCK    0x00001000
  45.  
  46. #define WV_MONO_DATA    (WV_MONO | WV_FALSE_STEREO)
  47.  
  48. #define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
  49.  
  50. #define WV_FLT_SHIFT_ONES 0x01
  51. #define WV_FLT_SHIFT_SAME 0x02
  52. #define WV_FLT_SHIFT_SENT 0x04
  53. #define WV_FLT_ZERO_SENT  0x08
  54. #define WV_FLT_ZERO_SIGN  0x10
  55.  
  56. #define WV_MAX_SAMPLES    131072
  57.  
  58. enum WP_ID_Flags {
  59.     WP_IDF_MASK   = 0x3F,
  60.     WP_IDF_IGNORE = 0x20,
  61.     WP_IDF_ODD    = 0x40,
  62.     WP_IDF_LONG   = 0x80
  63. };
  64.  
  65. enum WP_ID {
  66.     WP_ID_DUMMY = 0,
  67.     WP_ID_ENCINFO,
  68.     WP_ID_DECTERMS,
  69.     WP_ID_DECWEIGHTS,
  70.     WP_ID_DECSAMPLES,
  71.     WP_ID_ENTROPY,
  72.     WP_ID_HYBRID,
  73.     WP_ID_SHAPING,
  74.     WP_ID_FLOATINFO,
  75.     WP_ID_INT32INFO,
  76.     WP_ID_DATA,
  77.     WP_ID_CORR,
  78.     WP_ID_EXTRABITS,
  79.     WP_ID_CHANINFO,
  80.     WP_ID_SAMPLE_RATE = 0x27,
  81. };
  82.  
  83. typedef struct Decorr {
  84.     int delta;
  85.     int value;
  86.     int weightA;
  87.     int weightB;
  88.     int samplesA[MAX_TERM];
  89.     int samplesB[MAX_TERM];
  90.     int sumA;
  91.     int sumB;
  92. } Decorr;
  93.  
  94. typedef struct WvChannel {
  95.     int median[3];
  96.     int slow_level, error_limit;
  97.     int bitrate_acc, bitrate_delta;
  98. } WvChannel;
  99.  
  100. // macros for manipulating median values
  101. #define GET_MED(n) ((c->median[n] >> 4) + 1)
  102. #define DEC_MED(n) c->median[n] -= ((c->median[n] + (128 >> n) - 2) / (128 >> n)) * 2
  103. #define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> n)    ) / (128 >> n)) * 5
  104.  
  105. // macros for applying weight
  106. #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
  107.     if (samples && in) { \
  108.         if ((samples ^ in) < 0) { \
  109.             weight -= delta; \
  110.             if (weight < -1024) \
  111.                 weight = -1024; \
  112.         } else { \
  113.             weight += delta; \
  114.             if (weight > 1024) \
  115.                 weight = 1024; \
  116.         } \
  117.     }
  118.  
  119. static const int wv_rates[16] = {
  120.      6000,  8000,  9600, 11025, 12000, 16000,  22050, 24000,
  121.     32000, 44100, 48000, 64000, 88200, 96000, 192000,     0
  122. };
  123.  
  124. // exponent table copied from WavPack source
  125. static const uint8_t wp_exp2_table[256] = {
  126.     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
  127.     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
  128.     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
  129.     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
  130.     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
  131.     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
  132.     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
  133.     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  134.     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  135.     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
  136.     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
  137.     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
  138.     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
  139.     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
  140.     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
  141.     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
  142. };
  143.  
  144. static const uint8_t wp_log2_table [] = {
  145.     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,
  146.     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,
  147.     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,
  148.     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,
  149.     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,
  150.     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,
  151.     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
  152.     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
  153.     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
  154.     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,
  155.     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,
  156.     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,
  157.     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,
  158.     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,
  159.     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,
  160.     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff
  161. };
  162.  
  163. static av_always_inline int wp_exp2(int16_t val)
  164. {
  165.     int res, neg = 0;
  166.  
  167.     if (val < 0) {
  168.         val = -val;
  169.         neg = 1;
  170.     }
  171.  
  172.     res   = wp_exp2_table[val & 0xFF] | 0x100;
  173.     val >>= 8;
  174.     res   = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
  175.     return neg ? -res : res;
  176. }
  177.  
  178. static av_always_inline int wp_log2(int32_t val)
  179. {
  180.     int bits;
  181.  
  182.     if (!val)
  183.         return 0;
  184.     if (val == 1)
  185.         return 256;
  186.     val += val >> 9;
  187.     bits = av_log2(val) + 1;
  188.     if (bits < 9)
  189.         return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF];
  190.     else
  191.         return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF];
  192. }
  193.  
  194. #endif /* AVCODEC_WAVPACK_H */
  195.