/project/jni/sdl_sound/decoders/mpglib/tabinit.c

https://github.com/aichunyu/FFPlayer · C · 80 lines · 68 code · 12 blank · 0 comment · 14 complexity · 15c576fd78af2cbb8c7efb2f5be14383 MD5 · raw file

  1. #include <stdlib.h>
  2. #include "mpg123_sdlsound.h"
  3. real decwin[512+32];
  4. static real cos64[16],cos32[8],cos16[4],cos8[2],cos4[1];
  5. real *pnts[] = { cos64,cos32,cos16,cos8,cos4 };
  6. #if 0
  7. static unsigned char *conv16to8_buf = NULL;
  8. unsigned char *conv16to8;
  9. #endif
  10. static long intwinbase[] = {
  11. 0, -1, -1, -1, -1, -1, -1, -2, -2, -2,
  12. -2, -3, -3, -4, -4, -5, -5, -6, -7, -7,
  13. -8, -9, -10, -11, -13, -14, -16, -17, -19, -21,
  14. -24, -26, -29, -31, -35, -38, -41, -45, -49, -53,
  15. -58, -63, -68, -73, -79, -85, -91, -97, -104, -111,
  16. -117, -125, -132, -139, -147, -154, -161, -169, -176, -183,
  17. -190, -196, -202, -208, -213, -218, -222, -225, -227, -228,
  18. -228, -227, -224, -221, -215, -208, -200, -189, -177, -163,
  19. -146, -127, -106, -83, -57, -29, 2, 36, 72, 111,
  20. 153, 197, 244, 294, 347, 401, 459, 519, 581, 645,
  21. 711, 779, 848, 919, 991, 1064, 1137, 1210, 1283, 1356,
  22. 1428, 1498, 1567, 1634, 1698, 1759, 1817, 1870, 1919, 1962,
  23. 2001, 2032, 2057, 2075, 2085, 2087, 2080, 2063, 2037, 2000,
  24. 1952, 1893, 1822, 1739, 1644, 1535, 1414, 1280, 1131, 970,
  25. 794, 605, 402, 185, -45, -288, -545, -814, -1095, -1388,
  26. -1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
  27. -5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
  28. -8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
  29. -9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
  30. -7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
  31. -70, 998, 2122, 3300, 4533, 5818, 7154, 8540, 9975, 11455,
  32. 12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
  33. 30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
  34. 48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
  35. 64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
  36. 73415, 73908, 74313, 74630, 74856, 74992, 75038 };
  37. void make_decode_tables(long scaleval)
  38. {
  39. int i,j,k,kr,divv;
  40. real *table,*costab;
  41. for(i=0;i<5;i++)
  42. {
  43. kr=0x10>>i; divv=0x40>>i;
  44. costab = pnts[i];
  45. for(k=0;k<kr;k++)
  46. costab[k] = 1.0 / (2.0 * cos(M_PI * ((double) k * 2.0 + 1.0) / (double) divv));
  47. }
  48. table = decwin;
  49. scaleval = -scaleval;
  50. for(i=0,j=0;i<256;i++,j++,table+=32)
  51. {
  52. if(table < decwin+512+16)
  53. table[16] = table[0] = (double) intwinbase[j] / 65536.0 * (double) scaleval;
  54. if(i % 32 == 31)
  55. table -= 1023;
  56. if(i % 64 == 63)
  57. scaleval = - scaleval;
  58. }
  59. for( /* i=256 */ ;i<512;i++,j--,table+=32)
  60. {
  61. if(table < decwin+512+16)
  62. table[16] = table[0] = (double) intwinbase[j] / 65536.0 * (double) scaleval;
  63. if(i % 32 == 31)
  64. table -= 1023;
  65. if(i % 64 == 63)
  66. scaleval = - scaleval;
  67. }
  68. }