git.sesse.net Git - ffmpeg/blob - libavcodec/ac3tab.h

   1 /* tables taken directly from AC3 spec */
   2
   3 /* possible frequencies */
   4 const UINT16 ac3_freqs[3] = { 48000, 44100, 32000 };
   5
   6 /* possible bitrates */
   7 const UINT16 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 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 masktab[253];
  51
  52 static const UINT8 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 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 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 sdecaytab[4]={
 145     0x0f, 0x11, 0x13, 0x15,
 146 };
 147
 148 const UINT8 fdecaytab[4]={
 149     0x3f, 0x53, 0x67, 0x7b,
 150 };
 151
 152 const UINT16 sgaintab[4]= {
 153     0x540, 0x4d8, 0x478, 0x410,
 154 };
 155
 156 const UINT16 dbkneetab[4]= {
 157     0x000, 0x700, 0x900, 0xb00,
 158 };
 159
 160 const UINT16 floortab[8]= {
 161     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 162 };
 163
 164 const UINT16 fgaintab[8]= {
 165     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
 166 };
 167
 168 static const UINT8 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 bndtab[51];
 175
 176 /* fft & mdct sin cos tables */
 177 static INT16 costab[64];
 178 static INT16 sintab[64];
 179 static INT16 fft_rev[512];
 180 static INT16 xcos1[128];
 181 static INT16 xsin1[128];
 182
 183 static UINT16 crc_table[256];