diff options
Diffstat (limited to 'OpenAL32/alBuffer.c')
| -rw-r--r-- | OpenAL32/alBuffer.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/OpenAL32/alBuffer.c b/OpenAL32/alBuffer.c index d34aa3b1..cbfc843c 100644 --- a/OpenAL32/alBuffer.c +++ b/OpenAL32/alBuffer.c @@ -46,7 +46,7 @@ static void ConvertDataIMA4(ALvoid *dst, enum FmtType dstType, const ALvoid *src */ /* IMA ADPCM Stepsize table */ -static const long g_IMAStep_size[89] = { +static const long 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, @@ -59,13 +59,13 @@ static const long g_IMAStep_size[89] = { }; /* IMA4 ADPCM Codeword decode table */ -static const long g_IMACodeword_4[16] = { +static const long 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 long g_IMAIndex_adjust_4[16] = { +static const long IMA4Index_adjust[16] = { -1,-1,-1,-1, 2, 4, 6, 8, -1,-1,-1,-1, 2, 4, 6, 8 }; @@ -855,25 +855,25 @@ static ALmulaw EncodeMuLaw(ALshort val) return ~(sign | (exp<<4) | mant); } -static void DecodeIMA4Block(ALshort *dst, const ALubyte *IMAData, ALint numchans) +static void DecodeIMA4Block(ALshort *dst, const ALubyte *src, ALint numchans) { - ALint Sample[2],Index[2]; - ALuint IMACode[2]; + ALint sample[2], index[2]; + ALuint code[2]; ALsizei j,k,c; for(c = 0;c < numchans;c++) { - Sample[c] = *(IMAData++); - Sample[c] |= *(IMAData++) << 8; - Sample[c] = (Sample[c]^0x8000) - 32768; - Index[c] = *(IMAData++); - Index[c] |= *(IMAData++) << 8; - Index[c] = (Index[c]^0x8000) - 32768; + 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] = max(0, Index[c]); - Index[c] = min(Index[c], 88); + index[c] = max(0, index[c]); + index[c] = min(index[c], 88); - dst[c] = Sample[c]; + dst[c] = sample[c]; } j = 1; @@ -881,28 +881,28 @@ static void DecodeIMA4Block(ALshort *dst, const ALubyte *IMAData, ALint numchans { for(c = 0;c < numchans;c++) { - IMACode[c] = *(IMAData++); - IMACode[c] |= *(IMAData++) << 8; - IMACode[c] |= *(IMAData++) << 16; - IMACode[c] |= *(IMAData++) << 24; + code[c] = *(src++); + code[c] |= *(src++) << 8; + code[c] |= *(src++) << 16; + code[c] |= *(src++) << 24; } for(k = 0;k < 8;k++,j++) { for(c = 0;c < numchans;c++) { - Sample[c] += g_IMAStep_size[Index[c]] * - g_IMACodeword_4[IMACode[c]&15] / 8; - Index[c] += g_IMAIndex_adjust_4[IMACode[c]&15]; + int nibble = code[c]&0xf; + code[c] >>= 4; - Sample[c] = max(-32768, Sample[c]); - Sample[c] = min(Sample[c], 32767); + sample[c] += IMA4Codeword[nibble] * IMAStep_size[index[c]] / 8; + sample[c] = max(-32768, sample[c]); + sample[c] = min(sample[c], 32767); - Index[c] = max(0, Index[c]); - Index[c] = min(Index[c], 88); + index[c] += IMA4Index_adjust[nibble]; + index[c] = max(0, index[c]); + index[c] = min(index[c], 88); - dst[j*numchans + c] = Sample[c]; - IMACode[c] >>= 4; + dst[j*numchans + c] = sample[c]; } } } |