public void Decode(VGM_Stream vgmStream, VGM_Channel vgmChannel, ref short[] vgmOutput, int vgmChannelSpacing,
int vgmFirstSample, int vgmSamplesToDo, int vgmChannelNumber)
{
int framesin = vgmFirstSample / 14;
vgmFirstSample = vgmFirstSample % 14;
byte header = vgmChannel.fReader.Read_8Bits(vgmChannel.currentOffset + (UInt64)(framesin * 8));
int scale = 1 << (header & 0xf);
int coef_index = (header >> 4) & 0xf;
int vgmSampleHistory1 = vgmChannel.adpcm_history_32bits_1;
int vgmSampleHistory2 = vgmChannel.adpcm_history_32bits_2;
try
{
int coef1 = vgmChannel.adpcm_coef[coef_index * 2];
int coef2 = vgmChannel.adpcm_coef[coef_index * 2 + 1];
int vgmSampleCount, i;
int vgmSample;
for (i = vgmFirstSample, vgmSampleCount = 0; i < vgmFirstSample + vgmSamplesToDo; i++, vgmSampleCount += vgmChannelSpacing)
{
int sample_byte = vgmChannel.fReader.Read_8Bits(vgmChannel.currentOffset + (UInt64)(framesin * 8 + 1 + i / 2));
vgmSample = (((i & 1) == 1) ? VGM_Utils.LOWNIBBLE_SIGNED(sample_byte)
: VGM_Utils.HINIBBLE_SIGNED(sample_byte));
vgmSample = ((vgmSample * scale) << 11) + 1024;
vgmSample = vgmSample + (coef1 * vgmSampleHistory1 + coef2 * vgmSampleHistory2);
vgmSample = vgmSample >> 11;
vgmOutput[vgmStream.vgmSamplesBlockOffset + vgmSampleCount + vgmChannelNumber] = VGM_Utils.clamp16(vgmSample);
vgmSampleHistory2 = vgmSampleHistory1;
vgmSampleHistory1 = vgmSample;
}
vgmChannel.adpcm_history_32bits_1 = vgmSampleHistory1;
vgmChannel.adpcm_history_32bits_2 = vgmSampleHistory2;
}
catch (Exception e)
{
Console.Write(e.Message + " in DSP_Decoder");
}
}
public void Decode(VGM_Stream vgmStream, VGM_Channel vgmChannel, ref short[] vgmOutput, int vgmChannelSpacing,
int vgmFirstSample, int vgmSamplesToDo, int vgmChannelNumber)
{
int vgmSampleCount, i;
int framesin = vgmFirstSample / 32;
int scale = vgmChannel.fReader.Read_16bitsBE(vgmChannel.currentOffset + (UInt64)((framesin * 18) ^ vgmChannel.adx_xor)) + 1;
int vgmSampleHistory1 = vgmChannel.adpcm_history_32bits_1;
int vgmSampleHistory2 = vgmChannel.adpcm_history_32bits_2;
int coef1 = vgmChannel.adpcm_coef[0];
int coef2 = vgmChannel.adpcm_coef[1];
int vgmSample;
vgmFirstSample = vgmFirstSample % 32;
for (i = vgmFirstSample, vgmSampleCount = 0; i < vgmFirstSample + vgmSamplesToDo; i++, vgmSampleCount += vgmChannelSpacing)
{
int sample_byte = vgmChannel.fReader.Read_8Bits(vgmChannel.currentOffset + (UInt64)((framesin * 18) + 2 + i / 2));
sample_byte = (((i & 1) == 1) ? VGM_Utils.LOWNIBBLE_SIGNED(sample_byte) : VGM_Utils.HINIBBLE_SIGNED(sample_byte));
vgmSample = (sample_byte * scale);
vgmSample += (((coef1 * vgmSampleHistory1) + (coef2 * vgmSampleHistory2)) >> 12);
vgmOutput[vgmStream.vgmSamplesBlockOffset + vgmSampleCount + vgmChannelNumber] = VGM_Utils.clamp16(vgmSample);
vgmSampleHistory2 = vgmSampleHistory1;
vgmSampleHistory1 = vgmSample;
}
vgmChannel.adpcm_history_32bits_1 = vgmSampleHistory1;
vgmChannel.adpcm_history_32bits_2 = vgmSampleHistory2;
if ((i % 32) == 0)
{
for (i = 0; i < vgmChannel.adx_channels; i++)
{
VGM_Utils.adx_next_key(ref vgmChannel);
}
}
}