public static PcmData ReadWav(BinaryReader br)
{
var reader = new WavReader();
if (!reader.ReadHeaderAndSamples(br, 0, -1))
{
return(null);
}
var pcm = new PcmData();
pcm.AlbumTitle = reader.AlbumName;
pcm.ArtistName = reader.ArtistName;
pcm.DisplayName = reader.Title;
pcm.SetFormat(reader.NumChannels, reader.BitsPerSample,
reader.ValidBitsPerSample, reader.SampleRate,
reader.SampleValueRepresentationType, reader.NumFrames);
pcm.SetSampleLargeArray(reader.GetSampleLargeArray());
return(pcm);
}
private int Convert1(ConvertArgs ca)
{
int hr = 0;
CallEvent(EventCallbackTypes.Started, PROGRESS_STARTED, hr);
hr = mResampleGpu.ChooseAdapter(ca.mGpuId);
if (hr < 0)
{
CallEvent(EventCallbackTypes.InitGpuAdapterFailed, 0, hr);
return(hr);
}
var flacR = new FlacRW();
hr = flacR.DecodeAll(ca.mInPath);
if (hr < 0)
{
CallEvent(EventCallbackTypes.ReadFailed, 0, hr);
return(hr);
}
else
{
CallEvent(EventCallbackTypes.ReadCompleted, PROGRESS_READ_END, hr);
}
Metadata metaR;
flacR.GetDecodedMetadata(out metaR);
var inPcmOfCh = new List <float[]>();
for (int ch = 0; ch < metaR.channels; ++ch)
{
var pcm = new LargeArray <byte>(metaR.BytesPerSample * metaR.totalSamples);
int fragmentSamples = 1024 * 1024;
for (long posSamples = 0; posSamples < metaR.totalSamples; posSamples += fragmentSamples)
{
int copySamples = fragmentSamples;
if ((metaR.totalSamples - posSamples) < copySamples)
{
copySamples = (int)(metaR.totalSamples - posSamples);
}
var b = new byte[metaR.BytesPerSample * copySamples];
flacR.GetPcmOfChannel(ch, posSamples, ref b, copySamples);
pcm.CopyFrom(b, 0,
metaR.BytesPerSample * posSamples, metaR.BytesPerSample * copySamples);
}
var pcmData = new PcmData();
pcmData.SetFormat(1, metaR.bitsPerSample, metaR.bitsPerSample,
metaR.sampleRate, PcmData.ValueRepresentationType.SInt,
metaR.totalSamples);
pcmData.SetSampleLargeArray(pcm);
var fb = new float[metaR.totalSamples];
for (long i = 0; i < metaR.totalSamples; ++i)
{
fb[i] = pcmData.GetSampleValueInFloat(0, i);
}
pcmData = null;
pcm = null;
inPcmOfCh.Add(fb);
}
{
CallEvent(EventCallbackTypes.PrepareDataCompleted, PROGRESS_PREPARE_END, hr);
}
System.Diagnostics.Debug.Assert(0.5 <= ca.mSampleRateScale & ca.mSampleRateScale <= 2.0);
int sampleRateTo = (int)(ca.mSampleRateScale * metaR.sampleRate);
int sampleTotalTo = (int)(ca.mSampleRateScale * metaR.totalSamples);
// metaW: 出力フォーマット。
var metaW = new Metadata(metaR);
if (ca.mSampleRateScale < 1.0)
{
// 曲の長さを縮めると、エイリアシング雑音が出るのでローパスフィルターが必要になる。
// 出力サンプルレートを倍にしてローパスフィルターを省略。
sampleRateTo = (int)(2.0 * ca.mSampleRateScale * metaR.sampleRate);
sampleTotalTo = (int)(2.0 * ca.mSampleRateScale * metaR.totalSamples);
metaW.sampleRate *= 2;
}
metaW.bitsPerSample = 24;
metaW.totalSamples = sampleTotalTo;
// ローパスフィルターが不要になる条件。
System.Diagnostics.Debug.Assert(metaR.sampleRate <= metaW.sampleRate);
var outPcmOfCh = new List <float[]>();
for (int ch = 0; ch < metaR.channels; ++ch)
{
var inPcm = inPcmOfCh[ch];
mResampleGpu.Setup(SINC_CONVOLUTION_N, inPcm,
(int)metaR.totalSamples, metaR.sampleRate, sampleRateTo, sampleTotalTo);
for (int i = 0; i < sampleTotalTo; i += GPU_WORK_COUNT)
{
// 出力サンプル数countの調整。
int count = GPU_WORK_COUNT;
if (sampleTotalTo < i + count)
{
count = sampleTotalTo - i;
}
hr = mResampleGpu.Dispatch(i, count);
if (hr < 0)
{
CallEvent(EventCallbackTypes.ConvertFailed, 0, hr);
return(hr);
}
else
{
float progress0to1 = ((float)ch / metaR.channels)
+ (1.0f / metaR.channels) * ((float)i / sampleTotalTo);
int percent = (int)(PROGRESS_CONV_START +
progress0to1 * (PROGRESS_CONV_END - PROGRESS_CONV_START));
CallEvent(EventCallbackTypes.ConvProgress, percent, hr);
}
}
var outPcm = new float[sampleTotalTo];
mResampleGpu.ResultGetFromGpuMemory(outPcm);
outPcmOfCh.Add(outPcm);
mResampleGpu.Unsetup();
}
CallEvent(EventCallbackTypes.WriteStarted, PROGRESS_CONV_END, hr);
var flacW = new FlacRW();
hr = flacW.EncodeInit(metaW);
if (hr < 0)
{
CallEvent(EventCallbackTypes.WriteFailed, 0, hr);
return(hr);
}
if (0 < metaR.pictureBytes)
{
// 画像。
byte[] metaPicture = null;
flacR.GetDecodedPicture(out metaPicture, metaR.pictureBytes);
hr = flacW.EncodeSetPicture(metaPicture);
if (hr < 0)
{
CallEvent(EventCallbackTypes.WriteFailed, 0, hr);
return(hr);
}
}
for (int ch = 0; ch < metaW.channels; ++ch)
{
// 24bitのbyteAry作成。
var floatAry = outPcmOfCh[ch];
var byteAry = new LargeArray <byte>(3 * metaW.totalSamples); //< 24bitなので1サンプルあたり3バイト。
for (long i = 0; i < metaW.totalSamples; ++i)
{
var b = PcmDataUtil.ConvertTo24bitLE(floatAry[i]);
byteAry.CopyFrom(b, 0, i * 3, 3);
}
flacW.EncodeAddPcm(ch, byteAry);
}
hr = flacW.EncodeRun(ca.mOutPath);
if (hr < 0)
{
CallEvent(EventCallbackTypes.WriteFailed, 0, hr);
return(hr);
}
flacW.EncodeEnd();
flacR.DecodeEnd();
return(hr);
}
