public int EncodeAddPcm(int channel, WWUtil.LargeArray <byte> pcmData)
{
long pos = 0;
for (long remain = pcmData.LongLength; 0 < remain;)
{
int fragmentBytes = WWUtil.LargeArray <byte> .ARRAY_FRAGMENT_LENGTH_NUM;
if (remain < fragmentBytes)
{
fragmentBytes = (int)remain;
}
var fragment = new byte[fragmentBytes];
pcmData.CopyTo(pos, ref fragment, 0, fragmentBytes);
int rv = NativeMethods.WWFlacRW_EncodeSetPcmFragment(mId, channel, pos, fragment, fragmentBytes);
if (rv < 0)
{
return(rv);
}
pos += fragmentBytes;
remain -= fragmentBytes;
}
return(0);
}
public override WWUtil.LargeArray <double> FilterDo(WWUtil.LargeArray <double> inPcmLA)
{
var inPcm = inPcmLA.ToArray();
double [] outPcm = new double[inPcm.Length];
for (long i = 0; i < outPcm.Length; ++i)
{
mDelay.Filter(inPcm[i]);
outPcm[i] = Convolution();
}
return(new WWUtil.LargeArray <double>(outPcm));
}
public override WWUtil.LargeArray <double> FilterDo(WWUtil.LargeArray <double> inPcmLA)
{
var inPcm = inPcmLA.ToArray();
var outPcm = new double[inPcm.Length];
for (int i = 0; i < inPcm.Length; ++i)
{
double x = inPcm[i];
double delayedY = mDelayX.Filter(x);
for (int j = 0; j < MOVING_AVERAGER_NUM; ++j)
{
x = mMovingAveragerList[j].Filter(x);
}
double y = delayedY - x;
outPcm[i] = y;
}
if (0 < mDiscardSamples)
{
if (outPcm.Length < mDiscardSamples)
{
mDiscardSamples -= outPcm.Length;
return(new WWUtil.LargeArray <double>(0));
}
else
{
var outPcm2 = new double[outPcm.Length - mDiscardSamples];
Array.Copy(outPcm, mDiscardSamples, outPcm2, 0, outPcm2.Length);
mDiscardSamples = 0;
return(new WWUtil.LargeArray <double>(outPcm2));
}
}
return(new WWUtil.LargeArray <double>(outPcm));
}
public BWCompletedParam DoWork(BWStartParams param, ProgressReportDelegate ReportProgress)
{
int rv = 0;
var flacR = new WWFlacRWCS.FlacRW();
do
{
// FLACファイルからメタデータ、画像、音声を取り出す。
WWFlacRWCS.Metadata metaR;
rv = flacR.DecodeAll(param.inputFile);
if (rv < 0)
{
// do-whileを抜けたところでflacR.DecodeEndする。
break;
}
flacR.GetDecodedMetadata(out metaR);
byte[] picture = null;
if (0 < metaR.pictureBytes)
{
rv = flacR.GetDecodedPicture(out picture, metaR.pictureBytes);
if (rv < 0)
{
// do-whileを抜けたところでflacR.DecodeEndする。
break;
}
}
// flacRはまだ使用するのでここではDecodeEndしない。
long lcm = WWMath.Functions.LCM(metaR.sampleRate, param.targetSampleRate);
int upsampleScale = (int)(lcm / metaR.sampleRate);
int downsampleScale = (int)(lcm / param.targetSampleRate);
// IIRフィルターを設計。
// ストップバンド最小周波数fs。
double fs = metaR.sampleRate / 2 * STOPBAND_FREQ_RATIO;
if (param.targetSampleRate / 2 * STOPBAND_FREQ_RATIO < fs)
{
fs = param.targetSampleRate / 2 * STOPBAND_FREQ_RATIO;
}
// カットオフ周波数fc。
double fc = CUTOFF_STOPBAND_RATIO * fs;
mIIRFilterDesign = new IIRFilterDesign();
mIIRFilterDesign.Design(fc, fs, lcm, param.method);
ReportProgress(CONVERT_START_PERCENT, new BWProgressParam(State.FilterDesigned,
string.Format("Read FLAC completed.\nSource sample rate = {0}kHz.\nTarget sample rate = {1}kHz. ratio={2}/{3}\n",
metaR.sampleRate / 1000.0, param.targetSampleRate / 1000.0,
lcm / metaR.sampleRate, lcm / param.targetSampleRate)));
double RESAMPLE_RATIO = param.targetSampleRate / metaR.sampleRate;
mSw.Restart();
// 書き込み準備。
WWFlacRWCS.Metadata metaW = new WWFlacRWCS.Metadata(metaR);
metaW.sampleRate = param.targetSampleRate;
metaW.pictureBytes = metaR.pictureBytes;
metaW.bitsPerSample = 24;
metaW.totalSamples = metaR.totalSamples * upsampleScale / downsampleScale;
if (param.isTargetPcm)
{
mFlacWrite = new FlacWrite();
mFlacWrite.Setup(metaW, picture);
}
else
{
mDsfWrite = new DsfWrite();
mDsfWrite.Setup(metaW, picture);
}
var stat = new SampleValueStatistics();
long totalSamplesOfAllChannels = metaR.totalSamples * metaR.channels;
long processedSamples = 0;
// Mathematica用の設定。
WWComplex.imaginaryUnit = "I";
// 変換する
for (int ch = 0; ch < metaR.channels; ++ch)
{
//Parallel.For(0, metaR.channels, (int ch) => {
var pcmW = new WWUtil.LargeArray <byte>(metaW.totalSamples * metaW.BytesPerSample);
#if USE_ZOH_UPSAMPLE
// 零次ホールドのハイ落ち補償フィルター。
# if USE_CPP
var zohCompensation = new WWFilterCpp();
zohCompensation.BuildZohCompensation();
# else
var zohCompensation = new WWIIRFilterDesign.ZohNosdacCompensation(33);
# endif
