libavcodec/ac3tab.h

   1 /* tables taken directly from AC3 spec */
   2
   3 /* possible frequencies */
   4 const uint16_t ac3_freqs[3] = { 48000, 44100, 32000 };
   5
   6 /* possible bitrates */
   7 const uint16_t ac3_bitratetab[19] = {
   8     32, 40, 48, 56, 64, 80, 96, 112, 128,
   9     160, 192, 224, 256, 320, 384, 448, 512, 576, 640
  10 };
  11
  12 /* AC3 MDCT window */
  13
  14 /* MDCT window */
  15 const int16_t ac3_window[256] = {
  16     4,    7,   12,   16,   21,   28,   34,   42,
  17    51,   61,   72,   84,   97,  111,  127,  145,
  18   164,  184,  207,  231,  257,  285,  315,  347,
  19   382,  419,  458,  500,  544,  591,  641,  694,
  20   750,  810,  872,  937, 1007, 1079, 1155, 1235,
  21  1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
  22  2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
  23  3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
  24  4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
  25  6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
  26  8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
  27 10660,10960,11264,11570,11879,12190,12504,12820,
  28 13138,13458,13780,14103,14427,14753,15079,15407,
  29 15735,16063,16392,16720,17049,17377,17705,18032,
  30 18358,18683,19007,19330,19651,19970,20287,20602,
  31 20914,21225,21532,21837,22139,22438,22733,23025,
  32 23314,23599,23880,24157,24430,24699,24964,25225,
  33 25481,25732,25979,26221,26459,26691,26919,27142,
  34 27359,27572,27780,27983,28180,28373,28560,28742,
  35 28919,29091,29258,29420,29577,29729,29876,30018,
  36 30155,30288,30415,30538,30657,30771,30880,30985,
  37 31086,31182,31274,31363,31447,31528,31605,31678,
  38 31747,31814,31877,31936,31993,32046,32097,32145,
  39 32190,32232,32272,32310,32345,32378,32409,32438,
  40 32465,32490,32513,32535,32556,32574,32592,32608,
  41 32623,32636,32649,32661,32671,32681,32690,32698,
  42 32705,32712,32718,32724,32729,32733,32737,32741,
  43 32744,32747,32750,32752,32754,32756,32757,32759,
  44 32760,32761,32762,32763,32764,32764,32765,32765,
  45 32766,32766,32766,32766,32767,32767,32767,32767,
  46 32767,32767,32767,32767,32767,32767,32767,32767,
  47 32767,32767,32767,32767,32767,32767,32767,32767,
  48 };
  49
  50 static uint8_t masktab[253];
  51
  52 static const uint8_t latab[260]= {
  53 0x0040,0x003f,0x003e,0x003d,0x003c,0x003b,0x003a,0x0039,0x0038,0x0037,
  54 0x0036,0x0035,0x0034,0x0034,0x0033,0x0032,0x0031,0x0030,0x002f,0x002f,
  55 0x002e,0x002d,0x002c,0x002c,0x002b,0x002a,0x0029,0x0029,0x0028,0x0027,
  56 0x0026,0x0026,0x0025,0x0024,0x0024,0x0023,0x0023,0x0022,0x0021,0x0021,
  57 0x0020,0x0020,0x001f,0x001e,0x001e,0x001d,0x001d,0x001c,0x001c,0x001b,
  58 0x001b,0x001a,0x001a,0x0019,0x0019,0x0018,0x0018,0x0017,0x0017,0x0016,
  59 0x0016,0x0015,0x0015,0x0015,0x0014,0x0014,0x0013,0x0013,0x0013,0x0012,
  60 0x0012,0x0012,0x0011,0x0011,0x0011,0x0010,0x0010,0x0010,0x000f,0x000f,
  61 0x000f,0x000e,0x000e,0x000e,0x000d,0x000d,0x000d,0x000d,0x000c,0x000c,
  62 0x000c,0x000c,0x000b,0x000b,0x000b,0x000b,0x000a,0x000a,0x000a,0x000a,
  63 0x000a,0x0009,0x0009,0x0009,0x0009,0x0009,0x0008,0x0008,0x0008,0x0008,
  64 0x0008,0x0008,0x0007,0x0007,0x0007,0x0007,0x0007,0x0007,0x0006,0x0006,
  65 0x0006,0x0006,0x0006,0x0006,0x0006,0x0006,0x0005,0x0005,0x0005,0x0005,
  66 0x0005,0x0005,0x0005,0x0005,0x0004,0x0004,0x0004,0x0004,0x0004,0x0004,
  67 0x0004,0x0004,0x0004,0x0004,0x0004,0x0003,0x0003,0x0003,0x0003,0x0003,
  68 0x0003,0x0003,0x0003,0x0003,0x0003,0x0003,0x0003,0x0003,0x0003,0x0002,
  69 0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,
  70 0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0002,0x0001,0x0001,
  71 0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,
  72 0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,
  73 0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,
  74 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,
  75 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,
  76 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,
  77 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,
  78 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,
  79 };
  80
  81 static const uint16_t hth[50][3]= {
  82 { 0x04d0,0x04f0,0x0580 },
  83 { 0x04d0,0x04f0,0x0580 },
  84 { 0x0440,0x0460,0x04b0 },
  85 { 0x0400,0x0410,0x0450 },
  86 { 0x03e0,0x03e0,0x0420 },
  87 { 0x03c0,0x03d0,0x03f0 },
  88 { 0x03b0,0x03c0,0x03e0 },
  89 { 0x03b0,0x03b0,0x03d0 },
  90 { 0x03a0,0x03b0,0x03c0 },
  91 { 0x03a0,0x03a0,0x03b0 },
  92 { 0x03a0,0x03a0,0x03b0 },
  93 { 0x03a0,0x03a0,0x03b0 },
  94 { 0x03a0,0x03a0,0x03a0 },
  95 { 0x0390,0x03a0,0x03a0 },
  96 { 0x0390,0x0390,0x03a0 },
  97 { 0x0390,0x0390,0x03a0 },
  98 { 0x0380,0x0390,0x03a0 },
  99 { 0x0380,0x0380,0x03a0 },
 100 { 0x0370,0x0380,0x03a0 },
 101 { 0x0370,0x0380,0x03a0 },
 102 { 0x0360,0x0370,0x0390 },
 103 { 0x0360,0x0370,0x0390 },
 104 { 0x0350,0x0360,0x0390 },
 105 { 0x0350,0x0360,0x0390 },
 106 { 0x0340,0x0350,0x0380 },
 107 { 0x0340,0x0350,0x0380 },
 108 { 0x0330,0x0340,0x0380 },
 109 { 0x0320,0x0340,0x0370 },
 110 { 0x0310,0x0320,0x0360 },
 111 { 0x0300,0x0310,0x0350 },
 112 { 0x02f0,0x0300,0x0340 },
 113 { 0x02f0,0x02f0,0x0330 },
 114 { 0x02f0,0x02f0,0x0320 },
 115 { 0x02f0,0x02f0,0x0310 },
 116 { 0x0300,0x02f0,0x0300 },
 117 { 0x0310,0x0300,0x02f0 },
 118 { 0x0340,0x0320,0x02f0 },
 119 { 0x0390,0x0350,0x02f0 },
 120 { 0x03e0,0x0390,0x0300 },
 121 { 0x0420,0x03e0,0x0310 },
 122 { 0x0460,0x0420,0x0330 },
 123 { 0x0490,0x0450,0x0350 },
 124 { 0x04a0,0x04a0,0x03c0 },
 125 { 0x0460,0x0490,0x0410 },
 126 { 0x0440,0x0460,0x0470 },
 127 { 0x0440,0x0440,0x04a0 },
 128 { 0x0520,0x0480,0x0460 },
 129 { 0x0800,0x0630,0x0440 },
 130 { 0x0840,0x0840,0x0450 },
 131 { 0x0840,0x0840,0x04e0 },
 132 };
 133
 134 static const uint8_t baptab[64]= {
 135     0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
 136     3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
 137     7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
 138     9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
 139     12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
 140     14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
 141     15, 15, 15, 15,
 142 };
 143
 144 const uint8_t sdecaytab[4]={
 145     0x0f, 0x11, 0x13, 0x15,
 146 };
 147
 148 const uint8_t fdecaytab[4]={
 149     0x3f, 0x53, 0x67, 0x7b,
 150 };
 151
 152 const uint16_t sgaintab[4]= {
 153     0x540, 0x4d8, 0x478, 0x410,
 154 };
 155
 156 const uint16_t dbkneetab[4]= {
 157     0x000, 0x700, 0x900, 0xb00,
 158 };
 159
 160 const uint16_t floortab[8]= {
 161     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 162 };
 163
 164 const uint16_t fgaintab[8]= {
 165     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
 166 };
 167
 168 static const uint8_t bndsz[50]={
 169     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 170     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3,
 171     3, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 24, 24, 24, 24, 24
 172 };
 173
 174 static uint8_t bndtab[51];
 175
 176 /* fft & mdct sin cos tables */
 177 static int16_t costab[64];
 178 static int16_t sintab[64];
 179 static int16_t fft_rev[512];
 180 static int16_t xcos1[128];
 181 static int16_t xsin1[128];
 182
 183 static uint16_t crc_table[256];