sbyte MixPcm8()
{
sbyte pcm8 = 0;
if (mChannelCount == 1)
{
if (mBitDepth == 8)
{
pcm8 = ReadPcm8();
}
else
{
Waveform.Pcm16toPcm8(ReadPcm16(), out pcm8);
}
}
else
{
if (mBitDepth == 8)
{
var left = ReadPcm8();
var right = ReadPcm8();
pcm8 = MixStereoPcm8(left, right);
}
else
{
var left = ReadPcm16();
var right = ReadPcm16();
Waveform.Pcm16toPcm8(MixStereoPcm16(left, right), out pcm8);
}
}
return(pcm8);
}
public override void ReadPcm8(int sample, out sbyte pcm8)
{
if (sample < 0 || sample >= mSampleCount)
{
throw new ArgumentOutOfRangeException("sample");
}
pcm8 = 0;
switch (mFormat)
{
case WaveFormat.Pcm8: {
mReader.Goto(sample);
pcm8 = mReader.ReadS8();
break;
}
case WaveFormat.Pcm16: {
mReader.Goto(sample * 2);
Waveform.Pcm16toPcm8(mReader.ReadS16(), out pcm8);
break;
}
case WaveFormat.Adpcm2: {
int last = 0, penult = 0;
var pcm16 = new short[16];
for (var i = 0; i < mSampleCount; i += 16)
{
Waveform.Adpcm2toPcm16(mReader.Read8s(5), pcm16, ref last, ref penult);
if (i <= sample && sample < (i + 16))
{
Waveform.Pcm16toPcm8(pcm16[sample - i], out pcm8);
break;
}
}
break;
}
case WaveFormat.Adpcm4: {
int last = 0, penult = 0;
var pcm16 = new short[16];
for (var i = 0; i < mSampleCount; i += 16)
{
Waveform.Adpcm4toPcm16(mReader.Read8s(9), pcm16, ref last, ref penult);
if (i <= sample && sample < (i + 16))
{
Waveform.Pcm16toPcm8(pcm16[sample - i], out pcm8);
break;
}
}
break;
}
}
}
protected override void WritePcm8(aBinaryWriter writer)
{
mReader.Goto(0);
switch (mFormat)
{
case WaveFormat.Pcm8: {
writer.WriteS8s(mReader.ReadS8s(mSampleCount));
break;
}
case WaveFormat.Pcm16: {
for (var i = 0; i < mSampleCount; ++i)
{
sbyte pcm8;
Waveform.Pcm16toPcm8(mReader.ReadS16(), out pcm8);
writer.WriteS8(pcm8);
}
break;
}
case WaveFormat.Adpcm2: {
var pcm8 = new sbyte[16];
var pcm16 = new short[16];
int last = 0, penult = 0;
for (var i = 0; i < mSampleCount; i += 16)
{
Waveform.Adpcm2toPcm16(mReader.Read8s(5), pcm16, ref last, ref penult);
for (var j = 0; j < 16; ++j)
{
Waveform.Pcm16toPcm8(pcm16[j], out pcm8[j]);
}
writer.WriteS8s(pcm8, System.Math.Min(16, (mSampleCount - i)));
}
break;
}
case WaveFormat.Adpcm4: {
var pcm8 = new sbyte[16];
var pcm16 = new short[16];
int last = 0, penult = 0;
for (var i = 0; i < mSampleCount; i += 16)
{
Waveform.Adpcm4toPcm16(mReader.Read8s(9), pcm16, ref last, ref penult);
for (var j = 0; j < 16; ++j)
{
Waveform.Pcm16toPcm8(pcm16[j], out pcm8[j]);
}
writer.WriteS8s(pcm8, System.Math.Min(16, (mSampleCount - i)));
}
break;
}
}
}
public override void ReadPcm8(int sample, out sbyte left, out sbyte right)
{
if (sample < 0 || sample >= mSampleCount)
{
throw new ArgumentOutOfRangeException("sample");
}
GotoSample(sample);
if (mChannelCount == 1)
{
sbyte pcm8;
if (mBitDepth == 8)
{
pcm8 = ReadPcm8();
}
else
{
Waveform.Pcm16toPcm8(ReadPcm16(), out pcm8);
}
left = pcm8;
right = pcm8;
}
else
{
if (mBitDepth == 8)
{
left = ReadPcm8();
right = ReadPcm8();
}
else
{
Waveform.Pcm16toPcm8(ReadPcm16(), out left);
Waveform.Pcm16toPcm8(ReadPcm16(), out right);
}
}
}
