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OKIADPCMEncoder

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twinaphex 2020-09-16 20:44:54 +02:00
parent ea1b6ab280
commit ec42102685
1 changed files with 0 additions and 50 deletions
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50
mednafen/okiadpcm.h
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@ -108,54 +108,4 @@ class OKIADPCM_Decoder
int32 CurSample;
int32 StepSizeIndex;
};
template <OKIADPCM_Chip CHIP_TYPE>
class OKIADPCM_Encoder
{
public:
OKIADPCM_Encoder()
{
Accum = 0x800;
StepSizeIndex = 0;
}
~OKIADPCM_Encoder()
{
}
uint8 EncodeSample(uint16 in_sample)
{
uint8 nibble = 0;
int32 sample_delta = in_sample - Accum;
int piece;
piece = (abs(sample_delta) * 4 / OKIADPCM_StepSizes[StepSizeIndex]);
if(piece > 0x7)
piece = 0x7;
nibble = ((uint32)(sample_delta >> 31) & 0x8) | piece;
// Update Accum and StepSizeIndex!
Accum += OKIADPCM_DeltaTable[StepSizeIndex][nibble];
StepSizeIndex += OKIADPCM_StepIndexDeltas[nibble];
if(Accum > 0xFFF) Accum = 0xFFF;
if(Accum < 0) Accum = 0;
if(StepSizeIndex < 0)
StepSizeIndex = 0;
if(StepSizeIndex > 48)
StepSizeIndex = 48;
return(nibble);
}
private:
int32 Accum;
int32 StepSizeIndex;
OKIADPCM_Chip ChipType;
};
#endif