VrtToBft(PcmData.ValueRepresentationType vrt)
{
return((WasapiCS.BitFormatType)vrt);
}
public static LargeArray <byte> ConvertTo32bitInt(
int bitsPerSample, long numSamples,
PcmData.ValueRepresentationType valueType, LargeArray <byte> data)
{
if (bitsPerSample == 32 && valueType == PcmData.ValueRepresentationType.SInt)
{
// すでに所望の形式。
return(data);
}
var data32 = new LargeArray <byte>(numSamples * 4);
switch (valueType)
{
case PcmData.ValueRepresentationType.SInt:
switch (bitsPerSample)
{
case 16:
for (long i = 0; i < numSamples; ++i)
{
short v16 = (short)(
(uint)data.At(i * 2)
+ ((uint)data.At(i * 2 + 1) << 8));
int v32 = v16;
v32 *= 65536;
data32.Set(i * 4 + 0, 0);
data32.Set(i * 4 + 1, 0);
data32.Set(i * 4 + 2, (byte)((v32 & 0x00ff0000) >> 16));
data32.Set(i * 4 + 3, (byte)((v32 & 0xff000000) >> 24));
}
return(data32);
case 24:
for (long i = 0; i < numSamples; ++i)
{
int v32 = (int)(
((uint)data.At(i * 3 + 0) << 8)
+ ((uint)data.At(i * 3 + 1) << 16)
+ ((uint)data.At(i * 3 + 2) << 24));
data32.Set(i * 4 + 0, 0);
data32.Set(i * 4 + 1, (byte)((v32 & 0x0000ff00) >> 8));
data32.Set(i * 4 + 2, (byte)((v32 & 0x00ff0000) >> 16));
data32.Set(i * 4 + 3, (byte)((v32 & 0xff000000) >> 24));
}
return(data32);
case 32:
// 所望の形式。
System.Diagnostics.Debug.Assert(false);
return(null);
case 64:
for (long i = 0; i < numSamples; ++i)
{
// 16.48 fixed point
int v32 = (int)(
((uint)data.At(i * 8 + 2) << 0)
+ ((uint)data.At(i * 8 + 3) << 8)
+ ((uint)data.At(i * 8 + 4) << 16)
+ ((uint)data.At(i * 8 + 5) << 24));
data32.Set(i * 4 + 0, (byte)((v32 & 0x000000ff) >> 0));
data32.Set(i * 4 + 1, (byte)((v32 & 0x0000ff00) >> 8));
data32.Set(i * 4 + 2, (byte)((v32 & 0x00ff0000) >> 16));
data32.Set(i * 4 + 3, (byte)((v32 & 0xff000000) >> 24));
}
return(data32);
default:
System.Diagnostics.Debug.Assert(false);
return(null);
}
case PcmData.ValueRepresentationType.SFloat:
for (long i = 0; i < numSamples; ++i)
{
double v;
switch (bitsPerSample)
{
case 32: {
var b4 = new byte[4];
data.CopyTo(i * 4, ref b4, 0, 4);
v = BitConverter.ToSingle(b4, 0);
}
break;
case 64: {
var b8 = new byte[8];
data.CopyTo(i * 8, ref b8, 0, 8);
v = BitConverter.ToDouble(b8, 0);
}
break;
default:
System.Diagnostics.Debug.Assert(false);
return(null);
}
int v32 = 0;
if (1.0f <= v)
{
v32 = Int32.MaxValue;
}
else if (v < -1.0f)
{
v32 = Int32.MinValue;
}
else
{
long vMax = -((long)Int32.MinValue);
long v64 = (long)(v * vMax);
if (Int32.MaxValue < v64)
{
v64 = Int32.MaxValue;
}
v32 = (int)v64;
}
data32.Set(i * 4 + 0, (byte)((v32 & 0x000000ff) >> 0));
data32.Set(i * 4 + 1, (byte)((v32 & 0x0000ff00) >> 8));
data32.Set(i * 4 + 2, (byte)((v32 & 0x00ff0000) >> 16));
data32.Set(i * 4 + 3, (byte)((v32 & 0xff000000) >> 24));
}
return(data32);
default:
System.Diagnostics.Debug.Assert(false);
return(null);
}
}
public static byte[] ConvertTo24bit(int bitsPerSample, long numSamples, PcmData.ValueRepresentationType valueType, byte [] data)
{
if (bitsPerSample == 24 && valueType == PcmData.ValueRepresentationType.SInt)
{
return(data);
}
byte[] data24 = new byte[numSamples * 3];
switch (valueType)
{
case PcmData.ValueRepresentationType.SInt:
switch (bitsPerSample)
{
case 16:
for (long i = 0; i < numSamples; ++i)
{
short v16 = (short)((uint)data[i * 2] + ((uint)data[i * 2 + 1] << 8));
int v32 = v16;
v32 *= 65536;
data24[i * 3 + 0] = (byte)((v32 & 0x0000ff00) >> 8);
data24[i * 3 + 1] = (byte)((v32 & 0x00ff0000) >> 16);
data24[i * 3 + 2] = (byte)((v32 & 0xff000000) >> 24);
}
return(data24);
case 32:
for (long i = 0; i < numSamples; ++i)
{
int v32 = (int)(/* data[i * 4] + */ ((uint)data[i * 4 + 1] << 8) + ((uint)data[i * 4 + 2] << 16) + ((uint)data[i * 4 + 3] << 24));
data24[i * 3 + 0] = (byte)((v32 & 0x0000ff00) >> 8);
data24[i * 3 + 1] = (byte)((v32 & 0x00ff0000) >> 16);
data24[i * 3 + 2] = (byte)((v32 & 0xff000000) >> 24);
}
return(data24);
default:
System.Diagnostics.Debug.Assert(false);
return(null);
}
case PcmData.ValueRepresentationType.SFloat:
for (long i = 0; i < numSamples; ++i)
{
double v;
switch (bitsPerSample)
{
case 32:
v = BitConverter.ToSingle(data, (int)(i * 4));
break;
case 64:
v = BitConverter.ToDouble(data, (int)(i * 8));
break;
default:
System.Diagnostics.Debug.Assert(false);
return(null);
}
int v32 = 0;
if (1.0f <= v)
{
v32 = Int32.MaxValue;
}
else if (v < -1.0f)
{
v32 = Int32.MinValue;
}
else
{
long vMax = -((long)Int32.MinValue);
long v64 = (long)(v * vMax);
if (Int32.MaxValue < v64)
{
v64 = Int32.MaxValue;
}
v32 = (int)v64;
}
data24[i * 3 + 0] = (byte)((v32 & 0x0000ff00) >> 8);
data24[i * 3 + 1] = (byte)((v32 & 0x00ff0000) >> 16);
data24[i * 3 + 2] = (byte)((v32 & 0xff000000) >> 24);
}
return(data24);
default:
System.Diagnostics.Debug.Assert(false);
return(null);
}
}
