/// <summary>
/// double型のLargeArrayを入力するバージョン。
/// </summary>
public void SetPcmInDouble(WWUtil.LargeArray <double> pcm, long toPos)
{
long fromPos = 0;
long copyCount = pcm.LongLength;
if (mTotalSamples < toPos + pcm.LongLength)
{
copyCount = mTotalSamples - toPos;
}
for (long remain = copyCount; 0 < remain;)
{
int fragmentCount = WWUtil.LargeArray <byte> .ARRAY_FRAGMENT_LENGTH_NUM;
if (remain < fragmentCount)
{
fragmentCount = (int)(remain);
}
var fragment = new double[fragmentCount];
pcm.CopyTo(fromPos, ref fragment, 0, fragmentCount);
SetPcmInDouble(fragment, toPos);
fragment = null;
fromPos += fragmentCount;
toPos += fragmentCount;
remain -= fragmentCount;
}
}
public double[] GetPcmInDoubleSdm1bit(int count)
{
// サンプル数 / 8 == バイト数。
System.Diagnostics.Debug.Assert(count % 8 == 0);
System.Diagnostics.Debug.Assert(count <= WWUtil.LargeArray <byte> .ARRAY_FRAGMENT_LENGTH_NUM);
var result = new double[count];
int writePos = 0;
if (mTotalSamples / 8 <= mOffsBytes || count == 0)
{
// 完全に範囲外の時。
}
else
{
int copySamples = count;
if (mTotalSamples < mOffsBytes * 8 + copySamples)
{
copySamples = (int)(mTotalSamples - mOffsBytes * 8);
}
var bitBuff = new byte[copySamples / 8];
mData.CopyTo(mOffsBytes, ref bitBuff, 0, copySamples / 8);
for (long i = 0; i < copySamples / 8; ++i)
{
byte b = bitBuff[i];
// 1バイト内のビットの並びはMSBから古い順にデータが詰まっている。
for (int bit = 7; 0 <= bit; --bit)
{
result[writePos++] = ((b >> bit) & 1) == 1 ? 1.0 : -1.0;
}
}
mOffsBytes += copySamples / 8;
}
while (writePos < count)
{
byte b = 0x69; // DSD silence
// 1バイト内のビットの並びはMSBから古い順にデータが詰まっている。
for (int bit = 7; 0 <= bit; --bit)
{
result[writePos++] = ((b >> bit) & 1) == 1 ? 1.0 : -1.0;
}
}
return(result);
}
/// <summary>
/// data chunk : total size 8 bytes + payload size
/// </summary>
public void DataChunkWrite(BinaryWriter bw, bool isDs64, WWUtil.LargeArray <byte> rawData)
{
var chunkId = new byte[4];
chunkId[0] = (byte)'d';
chunkId[1] = (byte)'a';
chunkId[2] = (byte)'t';
chunkId[3] = (byte)'a';
bw.Write(chunkId);
if (UInt32.MaxValue < rawData.LongLength && !isDs64)
{
throw new ArgumentException("large rawData. needs DS64");
// RF64形式。別途ds64チャンクを用意して、そこにdata chunkのバイト数を入れる。
// ChunkSize = UInt32.MaxValue;
}
uint chunkSize;
if (isDs64)
{
chunkSize = UInt32.MaxValue;
}
else
{
chunkSize = (uint)rawData.LongLength;
}
bw.Write(chunkSize);
int fragmentLength = 1048576;
for (long pos = 0; pos < rawData.LongLength; pos += fragmentLength)
{
int count = fragmentLength;
if (rawData.LongLength - pos < count)
{
count = (int)(rawData.LongLength - pos);
}
var buff = new byte[count];
rawData.CopyTo(pos, ref buff, 0, count);
bw.Write(buff);
}
AddPadIfNecessary(bw, rawData.LongLength);
}
/// <summary>
/// サンプル値取得。フォーマットがなんであっても使用可能。
/// </summary>
/// <param name="ch">チャンネル番号</param>
/// <param name="pos">サンプル番号</param>
/// <returns>サンプル値。-1.0～+1.0位</returns>
public double GetSampleValueInDouble(int ch, long pos)
{
Debug.Assert(0 <= ch && ch < NumChannels);
if (pos < 0 || NumFrames <= pos)
{
return(0.0);
}
long offset = pos * BitsPerFrame / 8 + ch * BitsPerSample / 8;
var data = new byte[BitsPerSample / 8];
mSampleLargeArray.CopyTo(offset, ref data, 0, BitsPerSample / 8);
switch (BitsPerSample)
{
case 16:
data = ConvI16toF64(data);
break;
case 24:
data = ConvI24toF64(data);
break;
case 32:
switch (SampleValueRepresentationType)
{
case ValueRepresentationType.SInt:
data = ConvI32toF64(data);
break;
case ValueRepresentationType.SFloat:
data = ConvF32toF64(data);
break;
default:
System.Diagnostics.Debug.Assert(false);
break;
}
break;
case 64:
switch (SampleValueRepresentationType)
{
case ValueRepresentationType.SInt:
data = ConvI64toF64(data);
break;
case ValueRepresentationType.SFloat:
data = ConvF64toF64(data);
break;
default:
System.Diagnostics.Debug.Assert(false);
break;
}
break;
default:
System.Diagnostics.Debug.Assert(false);
break;
}
return(BitConverter.ToDouble(data, 0));
}
