diff options
| -rw-r--r-- | OpenAL32/alBuffer.c | 72 |
1 files changed, 70 insertions, 2 deletions
diff --git a/OpenAL32/alBuffer.c b/OpenAL32/alBuffer.c index 4992cc85..638b6b55 100644 --- a/OpenAL32/alBuffer.c +++ b/OpenAL32/alBuffer.c @@ -99,6 +99,29 @@ static const ALshort muLawDecompressionTable[256] = { 56, 48, 40, 32, 24, 16, 8, 0 }; +static const int muLawBias = 0x84; +static const int muLawClip = 32635; + +static const char muLawCompressTable[256] = +{ + 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3, + 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 +}; + /* * alGenBuffers(ALsizei n, ALuint *buffers) * @@ -799,6 +822,24 @@ AL_API void AL_APIENTRY alGetBufferiv(ALuint buffer, ALenum eParam, ALint* plVal } +typedef ALubyte ALmulaw; + +static ALmulaw EncodeMuLaw(ALshort val) +{ + ALint mant, exp, sign; + + sign = (val>>8) & 0x80; + if(sign) val = (ALshort)-val; + + val = min(val, muLawClip); + val += muLawBias; + + exp = muLawCompressTable[(val>>7) & 0xff]; + mant = (val >> (exp+3)) & 0x0f; + + return ~(sign | (exp<<4) | mant); +} + static void DecodeIMA4Block(ALshort *dst, const ALubyte *IMAData, ALint numchans) { ALint Sample[2],Index[2]; @@ -852,8 +893,6 @@ static void DecodeIMA4Block(ALshort *dst, const ALubyte *IMAData, ALint numchans } -typedef ALubyte ALmulaw; - static __inline ALbyte Conv_ALbyte_ALbyte(ALbyte val) { return val; } static __inline ALbyte Conv_ALbyte_ALubyte(ALubyte val) @@ -1054,6 +1093,21 @@ static __inline ALdouble Conv_ALdouble_ALdouble(ALdouble val) static __inline ALdouble Conv_ALdouble_ALmulaw(ALmulaw val) { return muLawDecompressionTable[val] * (1.0/32767.0); } +#define DECL_TEMPLATE(T) \ +static ALmulaw Conv_ALmulaw_##T(T val) \ +{ return EncodeMuLaw(Conv_ALshort_##T(val)); } + +DECL_TEMPLATE(ALbyte) +DECL_TEMPLATE(ALubyte) +DECL_TEMPLATE(ALshort) +DECL_TEMPLATE(ALushort) +DECL_TEMPLATE(ALint) +DECL_TEMPLATE(ALuint) +DECL_TEMPLATE(ALfloat) +DECL_TEMPLATE(ALdouble) +DECL_TEMPLATE(ALmulaw) + +#undef DECL_TEMPLATE #define DECL_TEMPLATE(T1, T2) \ static void Convert_##T1##_##T2(T1 *dst, const T2 *src, ALuint len) \ @@ -1143,6 +1197,16 @@ DECL_TEMPLATE(ALdouble, ALfloat) DECL_TEMPLATE(ALdouble, ALdouble) DECL_TEMPLATE(ALdouble, ALmulaw) +DECL_TEMPLATE(ALmulaw, ALbyte) +DECL_TEMPLATE(ALmulaw, ALubyte) +DECL_TEMPLATE(ALmulaw, ALshort) +DECL_TEMPLATE(ALmulaw, ALushort) +DECL_TEMPLATE(ALmulaw, ALint) +DECL_TEMPLATE(ALmulaw, ALuint) +DECL_TEMPLATE(ALmulaw, ALfloat) +DECL_TEMPLATE(ALmulaw, ALdouble) +DECL_TEMPLATE(ALmulaw, ALmulaw) + #undef DECL_TEMPLATE #define DECL_TEMPLATE(T) \ @@ -1168,6 +1232,7 @@ DECL_TEMPLATE(ALint) DECL_TEMPLATE(ALuint) DECL_TEMPLATE(ALfloat) DECL_TEMPLATE(ALdouble) +DECL_TEMPLATE(ALmulaw) #undef DECL_TEMPLATE @@ -1217,6 +1282,7 @@ DECL_TEMPLATE(ALint) DECL_TEMPLATE(ALuint) DECL_TEMPLATE(ALfloat) DECL_TEMPLATE(ALdouble) +DECL_TEMPLATE(ALmulaw) #undef DECL_TEMPLATE @@ -1239,6 +1305,7 @@ static void ConvertData(ALvoid *dst, enum FmtType dstType, const ALvoid *src, en Convert_ALfloat(dst, src, srcType, len); break; (void)Convert_ALdouble; + (void)Convert_ALmulaw; } } @@ -1260,6 +1327,7 @@ static void ConvertDataIMA4(ALvoid *dst, enum FmtType dstType, const ALvoid *src Convert_ALfloat_IMA4(dst, src, chans, len); break; (void)Convert_ALdouble_IMA4; + (void)Convert_ALmulaw_IMA4; } } |