diff options
Diffstat (limited to 'akode/plugins/mpc_decoder/mppdec/mpc_math.h')
-rw-r--r-- | akode/plugins/mpc_decoder/mppdec/mpc_math.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/akode/plugins/mpc_decoder/mppdec/mpc_math.h b/akode/plugins/mpc_decoder/mppdec/mpc_math.h new file mode 100644 index 0000000..df894be --- /dev/null +++ b/akode/plugins/mpc_decoder/mppdec/mpc_math.h @@ -0,0 +1,88 @@ +#ifndef _MPC_MATH_H_ +#define _MPC_MATH_H_ + + +// #define MPC_FIXED_POINT + + +#ifdef _MSC_VER +typedef __int64 MPC_INT64; +#else +typedef long long MPC_INT64; +#endif + + +#define MPC_FIXED_POINT_SHIFT 16 + +#ifdef MPC_FIXED_POINT + +#define MPC_FIXED_POINT_SCALE_SHIFT (MPC_FIXED_POINT_SHIFT + MPC_FIXED_POINT_FRACTPART) +#define MPC_FIXED_POINT_SCALE (1 << (MPC_FIXED_POINT_SCALE_SHIFT - 1)) + + +//in fixedpoint mode, results in decode output buffer are in -MPC_FIXED_POINT_SCALE ... MPC_FIXED_POINT_SCALE range + +#define MPC_FIXED_POINT_FRACTPART 14 +typedef int MPC_SAMPLE_FORMAT; + +typedef MPC_INT64 MPC_SAMPLE_FORMAT_MULTIPLY; + +#define MAKE_MPC_SAMPLE(X) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((MPC_INT64)1)<<MPC_FIXED_POINT_FRACTPART)) +#define MAKE_MPC_SAMPLE_EX(X,Y) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((MPC_INT64)1)<<(Y))) + +#define MPC_MULTIPLY_NOTRUNCATE(X,Y) \ + (((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> MPC_FIXED_POINT_FRACTPART) + +#define MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z) \ + (((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> (Z)) + +#ifdef _DEBUG +static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2) +{ + MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_NOTRUNCATE(item1,item2); + assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp); + return (MPC_SAMPLE_FORMAT)temp; +} + +static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY_EX(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2,unsigned shift) +{ + MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_EX_NOTRUNCATE(item1,item2,shift); + assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp); + return (MPC_SAMPLE_FORMAT)temp; +} + +#else + +#define MPC_MULTIPLY(X,Y) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_NOTRUNCATE(X,Y)) +#define MPC_MULTIPLY_EX(X,Y,Z) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z)) + +#endif + +#define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y)) +#define MPC_SCALE_CONST(X,Y,Z) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z)) +#define MPC_SCALE_CONST_SHL(X,Y,Z,S) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z)-(S)) +#define MPC_SCALE_CONST_SHR(X,Y,Z,S) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z)+(S)) +#define MPC_SHR(X,Y) ((X)>>(Y)) +#define MPC_SHL(X,Y) ((X)<<(Y)) + +#else + +//in floating-point mode, decoded samples are in -1...1 range + +typedef float MPC_SAMPLE_FORMAT; + +#define MAKE_MPC_SAMPLE(X) ((MPC_SAMPLE_FORMAT)(X)) +#define MAKE_MPC_SAMPLE_EX(X,Y) ((MPC_SAMPLE_FORMAT)(X)) + +#define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y)) +#define MPC_MULTIPLY(X,Y) ((X)*(Y)) +#define MPC_MULTIPLY_EX(X,Y,Z) ((X)*(Y)) +#define MPC_SCALE_CONST(X,Y,Z) ((X)*(Y)) +#define MPC_SCALE_CONST_SHL(X,Y,Z,S) ((X)*(Y)) +#define MPC_SCALE_CONST_SHR(X,Y,Z,S) ((X)*(Y)) +#define MPC_SHR(X,Y) (X) +#define MPC_SHL(X,Y) (X) + +#endif + +#endif |