diff options
Diffstat (limited to 'adpcm.c')
| -rw-r--r-- | adpcm.c | 154 |
1 files changed, 153 insertions, 1 deletions
@@ -32,13 +32,41 @@ static int adpcm_step[89] = 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 }; +//static int fox62_step[89] = +static int fox62_step[] = +{ + 0x7, 0x8, 0x9, 0xa, + 0xb, 0xc, 0xd, 0xf, + 0x10, 0x12, 0x13, 0x15, + 0x17, 0x1a, 0x1c, 0x1f, + 0x22, 0x26, 0x29, 0x2e, + 0x32, 0x37, 0x3d, 0x43, + 0x4a, 0x51, 0x59, 0x62, + 0x6c, 0x76, 0x82, 0x8f, + 0x9e, 0xad, 0xbf, 0xd2, + 0xe7, 0xfe, 0x117, 0x133, + 0x152, 0x174, 0x199, 0x1c2, + 0x1ef, 0x220, 0x256, 0x292, + 0x2d4, 0x31d, 0x36c, 0x3c4, + 0x424, 0x48e, 0x503, 0x583, + 0x610, 0x6ac, 0x756, 0x812, + 0x8e1, 0x9c4, 0xabe, 0x8d1, + 0xcff, 0xe4c, 0xfba, 0x114d, + 0x1308, 0x14ef, 0x1707, 0x1954, + 0x1bdd, 0x1ea6, 0x21b7, 0x2516, + 0x28cb, 0x2cdf, 0x315c, 0x364c, + 0x3bba, 0x41b2, 0x4844, 0x4f7e, + 0x5771, 0x6030, 0x69ce, 0x7463, + 0x7FFF +}; + static int adpcm_index[16] = { -1, -1, -1, -1, 2, 4, 6, 8, -1, -1, -1, -1, 2, 4, 6, 8 }; -static int format_0x62_table[16] = +static int fox62_extra_table[16] = { 1, 3, 5, 7, 9, 11, 13, 15, -1, -3, -5, -7, -9, -11, -13, -15 @@ -269,3 +297,127 @@ int ms_adpcm_decode_block(unsigned short *output, unsigned char *input, return MS_ADPCM_SAMPLES_PER_BLOCK * channels; } + +// note: This decoder assumes the format 0x62 data always comes in +// stereo flavor +int fox62_adpcm_decode_block(unsigned short *output, unsigned char *input, + int channels) +{ + int predictor_l; + int predictor_r; + int index_l; + int index_r; + int code_l; + int code_r; + int i; + int out_ptr = 0; + + int temp1, temp2, edi, eax, edx; +static int counter = 0; + + predictor_l = LE_16(&input[10]); + edi = predictor_r = LE_16(&input[12]); + SE_16BIT(predictor_l); + SE_16BIT(predictor_r); + index_l = input[14]; + index_r = input[15]; + + for (i = 16; i < FOX62_ADPCM_BLOCK_SIZE; i++) + { + code_l = input[i] & 0x0F; + code_r = input[i] >> 4; +if (counter == 0) + printf ("code_l = %02X, predictor_l = %04X, index_l = %02X\n", + code_l, predictor_l, index_l); +if (counter == 0) + printf ("code_r = %02X, predictor_r = %04X, index_r = %02X\n", + code_r, predictor_r, index_r); + + // left side +if (counter == 0) + printf ("step = %04X, extra = %02X\n", fox62_step[index_l], fox62_extra_table[code_l]); + temp1 = fox62_step[index_l] * fox62_extra_table[code_l]; +if (counter == 0) + printf ("temp1 (before) = %04X\n", temp1); + if (temp1 < 0) + temp1 += 7; +if (counter == 0) + printf ("temp1 (after) = %04X\n", temp1); + + temp2 = predictor_l; + temp1 /= 8; +if (counter == 0) + printf ("temp1 (after div) = %04X\n", temp1); + temp2 += temp1; +if (counter == 0) + printf ("temp2 (predictor_l before clamp) = %04X\n", temp2); + CLAMP_S16(temp2); +if (counter == 0) + printf ("temp2 (predictor_l after clamp) = %04X\n", temp2); + predictor_l = temp2; + + index_l += adpcm_index[code_l]; +if (counter == 0) + printf ("adjusted index_l = %02X\n", index_l); + CLAMP_0_TO_88(index_l); + + // right side +if (counter == 0) + printf ("step = %04X, extra = %02X\n", fox62_step[index_r], fox62_extra_table[code_r]); + temp1 = fox62_step[index_r] * fox62_extra_table[code_r]; +if (counter == 0) + printf ("temp1 (before) = %04X\n", temp1); + if (temp1 < 0) + temp1 += 7; +if (counter == 0) + printf ("temp1 (after) = %04X\n", temp1); + + temp2 = predictor_r; + temp1 /= 8; +if (counter == 0) + printf ("temp1 (after div) = %04X\n", temp1); + temp2 += temp1; +if (counter == 0) + printf ("temp2 (predictor_r before clamp) = %04X\n", temp2); + CLAMP_S16(temp2); +if (counter == 0) + printf ("temp2 (predictor_r after clamp) = %04X\n", temp2); + predictor_r = temp2; + + index_r += adpcm_index[code_r]; +if (counter == 0) + printf ("adjusted index_r = %02X\n", index_r); + CLAMP_0_TO_88(index_r); + + // do the weird final output process + edi += predictor_r; + edi /= 2; + eax = predictor_l + edi; + edx = edi * 2; +if (counter == 0) + printf ("eax = %08X, edx = %08X, edi = %08X\n", eax, edx, edi); + output[out_ptr++] = eax; + + predictor_l = eax; + eax -= edx; +if (counter == 0) + printf ("eax = %08X, edx = %08X, edi = %08X\n", eax, edx, edi); +// x24 += 4 + output[out_ptr++] = eax; + predictor_l = eax; + eax += edi; +if (counter == 0) + printf ("eax = %08X, edx = %08X, edi = %08X\n", eax, edx, edi); + edi = predictor_r; +if (counter == 0) + printf ("eax = %08X, edx = %08X, edi = %08X\n", eax, edx, edi); + predictor_l = eax; + +if (counter == 0) + printf ("L-sample = %04X, R-sample = %04X\n", + output[out_ptr-2], output[out_ptr-1]); +counter++; + } + + return FOX62_ADPCM_SAMPLES_PER_BLOCK * channels; +} |