#include "config.h" #include "sample_cvt.h" #include "AL/al.h" #include "alu.h" #include "alBuffer.h" /* IMA ADPCM Stepsize table */ static const int IMAStep_size[89] = { 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493,10442, 11487,12635,13899,15289,16818,18500,20350,22358,24633,27086,29794, 32767 }; /* IMA4 ADPCM Codeword decode table */ static const int IMA4Codeword[16] = { 1, 3, 5, 7, 9, 11, 13, 15, -1,-3,-5,-7,-9,-11,-13,-15, }; /* IMA4 ADPCM Step index adjust decode table */ static const int IMA4Index_adjust[16] = { -1,-1,-1,-1, 2, 4, 6, 8, -1,-1,-1,-1, 2, 4, 6, 8 }; /* MSADPCM Adaption table */ static const int MSADPCMAdaption[16] = { 230, 230, 230, 230, 307, 409, 512, 614, 768, 614, 512, 409, 307, 230, 230, 230 }; /* MSADPCM Adaption Coefficient tables */ static const int MSADPCMAdaptionCoeff[7][2] = { { 256, 0 }, { 512, -256 }, { 0, 0 }, { 192, 64 }, { 240, 0 }, { 460, -208 }, { 392, -232 } }; /* A quick'n'dirty lookup table to decode a muLaw-encoded byte sample into a * signed 16-bit sample */ const ALshort muLawDecompressionTable[256] = { -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956, -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764, -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412, -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316, -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140, -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092, -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004, -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980, -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436, -1372, -1308, -1244, -1180, -1116, -1052, -988, -924, -876, -844, -812, -780, -748, -716, -684, -652, -620, -588, -556, -524, -492, -460, -428, -396, -372, -356, -340, -324, -308, -292, -276, -260, -244, -228, -212, -196, -180, -164, -148, -132, -120, -112, -104, -96, -88, -80, -72, -64, -56, -48, -40, -32, -24, -16, -8, 0, 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764, 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412, 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140, 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004, 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436, 1372, 1308, 1244, 1180, 1116, 1052, 988, 924, 876, 844, 812, 780, 748, 716, 684, 652, 620, 588, 556, 524, 492, 460, 428, 396, 372, 356, 340, 324, 308, 292, 276, 260, 244, 228, 212, 196, 180, 164, 148, 132, 120, 112, 104, 96, 88, 80, 72, 64, 56, 48, 40, 32, 24, 16, 8, 0 }; /* A quick'n'dirty lookup table to decode an aLaw-encoded byte sample into a * signed 16-bit sample */ const ALshort aLawDecompressionTable[256] = { -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736, -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784, -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368, -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392, -22016,-20992,-24064,-23040,-17920,-16896,-19968,-18944, -30208,-29184,-32256,-31232,-26112,-25088,-28160,-27136, -11008,-10496,-12032,-11520, -8960, -8448, -9984, -9472, -15104,-14592,-16128,-15616,-13056,-12544,-14080,-13568, -344, -328, -376, -360, -280, -264, -312, -296, -472, -456, -504, -488, -408, -392, -440, -424, -88, -72, -120, -104, -24, -8, -56, -40, -216, -200, -248, -232, -152, -136, -184, -168, -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184, -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696, -688, -656, -752, -720, -560, -528, -624, -592, -944, -912, -1008, -976, -816, -784, -880, -848, 5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736, 7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784, 2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368, 3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392, 22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944, 30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136, 11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472, 15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568, 344, 328, 376, 360, 280, 264, 312, 296, 472, 456, 504, 488, 408, 392, 440, 424, 88, 72, 120, 104, 24, 8, 56, 40, 216, 200, 248, 232, 152, 136, 184, 168, 1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184, 1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696, 688, 656, 752, 720, 560, 528, 624, 592, 944, 912, 1008, 976, 816, 784, 880, 848 }; static void DecodeIMA4Block(ALshort *dst, const ALubyte *src, ALint numchans, ALsizei align) { ALint sample[MAX_INPUT_CHANNELS] = { 0 }; ALint index[MAX_INPUT_CHANNELS] = { 0 }; ALuint code[MAX_INPUT_CHANNELS] = { 0 }; ALsizei c, i; for(c = 0;c < numchans;c++) { sample[c] = *(src++); sample[c] |= *(src++) << 8; sample[c] = (sample[c]^0x8000) - 32768; index[c] = *(src++); index[c] |= *(src++) << 8; index[c] = (index[c]^0x8000) - 32768; index[c] = clampi(index[c], 0, 88); dst[c] = sample[c]; } for(i = 1;i < align;i++) { if((i&7) == 1) { for(c = 0;c < numchans;c++) { code[c] = *(src++); code[c] |= *(src++) << 8; code[c] |= *(src++) << 16; code[c] |= *(src++) << 24; } } for(c = 0;c < numchans;c++) { int nibble = code[c]&0xf; code[c] >>= 4; sample[c] += IMA4Codeword[nibble] * IMAStep_size[index[c]] / 8; sample[c] = clampi(sample[c], -32768, 32767); index[c] += IMA4Index_adjust[nibble]; index[c] = clampi(index[c], 0, 88); *(dst++) = sample[c]; } } } static void DecodeMSADPCMBlock(ALshort *dst, const ALubyte *src, ALint numchans, ALsizei align) { ALubyte blockpred[MAX_INPUT_CHANNELS] = { 0 }; ALint delta[MAX_INPUT_CHANNELS] = { 0 }; ALshort samples[MAX_INPUT_CHANNELS][2] = { { 0, 0 } }; ALint c, i; for(c = 0;c < numchans;c++) { blockpred[c] = *(src++); blockpred[c] = minu(blockpred[c], 6); } for(c = 0;c < numchans;c++) { delta[c] = *(src++); delta[c] |= *(src++) << 8; delta[c] = (delta[c]^0x8000) - 32768; } for(c = 0;c < numchans;c++) { samples[c][0] = *(src++); samples[c][0] |= *(src++) << 8; samples[c][0] = (samples[c][0]^0x8000) - 32768; } for(c = 0;c < numchans;c++) { samples[c][1] = *(src++); samples[c][1] |= *(src++) << 8; samples[c][1] = (samples[c][1]^0x8000) - 0x8000; } /* Second sample is written first. */ for(c = 0;c < numchans;c++) *(dst++) = samples[c][1]; for(c = 0;c < numchans;c++) *(dst++) = samples[c][0]; for(i = 2;i < align;i++) { for(c = 0;c < numchans;c++) { const ALint num = (i*numchans) + c; ALint nibble, pred; /* Read the nibble (first is in the upper bits). */ if(!(num&1)) nibble = (*src>>4)&0x0f; else nibble = (*(src++))&0x0f; pred = (samples[c][0]*MSADPCMAdaptionCoeff[blockpred[c]][0] + samples[c][1]*MSADPCMAdaptionCoeff[blockpred[c]][1]) / 256; pred += ((nibble^0x08) - 0x08) * delta[c]; pred = clampi(pred, -32768, 32767); samples[c][1] = samples[c][0]; samples[c][0] = pred; delta[c] = (MSADPCMAdaption[nibble] * delta[c]) / 256; delta[c] = maxi(16, delta[c]); *(dst++) = pred; } } } void Convert_ALshort_ALima4(ALshort *dst, const ALubyte *src, ALsizei numchans, ALsizei len, ALsizei align) { ALsizei byte_align = ((align-1)/2 + 4) * numchans; ALsizei i; assert(align > 0 && (len%align) == 0); for(i = 0;i < len;i += align) { DecodeIMA4Block(dst, src, numchans, align); src += byte_align; dst += align*numchans; } } void Convert_ALshort_ALmsadpcm(ALshort *dst, const ALubyte *src, ALsizei numchans, ALsizei len, ALsizei align) { ALsizei byte_align = ((align-2)/2 + 7) * numchans; ALsizei i; assert(align > 1 && (len%align) == 0); for(i = 0;i < len;i += align) { DecodeMSADPCMBlock(dst, src, numchans, align); src += byte_align; dst += align*numchans; } }