public void CanAccessSamplesIndividuallyInAMonoFile()
{
var ms = new MemoryStream();
using (var writer = new WaveFileWriter( new IgnoreDisposeStream(ms), new WaveFormat(8000, 16, 1)))
{
writer.WriteSample(0.1f);
writer.WriteSample(0.2f);
writer.WriteSample(0.3f);
writer.WriteSample(0.4f);
}
ms.Position = 0;
using (var reader = new WaveFileReader(ms))
{
Assert.AreEqual(0.1f, reader.ReadNextSampleFrame()[0], 0.001f);
Assert.AreEqual(0.2f, reader.ReadNextSampleFrame()[0], 0.001f);
Assert.AreEqual(0.3f, reader.ReadNextSampleFrame()[0], 0.001f);
Assert.AreEqual(0.4f, reader.ReadNextSampleFrame()[0], 0.001f);
Assert.IsNull(reader.ReadNextSampleFrame());
}
}
public void CanAccessSamplesIndividuallyInAStereo24BitFile()
{
var ms = new MemoryStream();
using (var writer = new WaveFileWriter(new IgnoreDisposeStream(ms), new WaveFormat(44100, 24, 2)))
{
writer.WriteSample(0.1f);
writer.WriteSample(0.2f);
writer.WriteSample(0.3f);
writer.WriteSample(0.4f);
}
ms.Position = 0;
using (var reader = new WaveFileReader(ms))
{
var f1 = reader.ReadNextSampleFrame();
Assert.AreEqual(0.1f, f1[0], 0.0001f);
Assert.AreEqual(0.2f, f1[1], 0.0001f);
var f2 = reader.ReadNextSampleFrame();
Assert.AreEqual(0.3f, f2[0], 0.0001f);
Assert.AreEqual(0.4f, f2[1], 0.0001f);
Assert.IsNull(reader.ReadNextSampleFrame());
}
}
public static int[] GetVolumesDiscrete(byte[] wav, double intervalSec)
{
using (var ms = new MemoryStream(wav))
using (var fr = new WaveFileReader(ms))
{
var totalTime = fr.TotalTime;
int[] result = new int[(int)(totalTime.TotalSeconds / intervalSec)];
for (int i = 0; i < result.Length; i++)
{
var normalizedVolumes = new List<float>();
var nextIntervalStart = TimeSpan.FromSeconds((i + 1) * intervalSec);
if(nextIntervalStart > totalTime)
{
nextIntervalStart = totalTime;
}
while (fr.CurrentTime < nextIntervalStart)
{
float[] volumes = fr.ReadNextSampleFrame();
foreach (var volume in volumes)
{
normalizedVolumes.Add(volume);
}
}
//見ての通り二乗値を平均して平方根を取る
double v = Math.Sqrt(normalizedVolumes
.Select(n => n * n)
.Sum() / normalizedVolumes.Count
);
result[i] = v < Thresh0 ? 0 :
v < Thresh1 ? 1 :
v < Thresh2 ? 2 :
v < Thresh3 ? 3 :
v < Thresh4 ? 4 : 5;
}
return result;
}
}
/// <summary>
/// Gets the maximum.
/// </summary>
/// <param name="file">The file.</param>
/// <returns>
/// Max float value in file
/// </returns>
private static float GetMax(string file)
{
using (var reader = new WaveFileReader(file))
{
float[] buffer;
float max = 0;
while ((buffer = reader.ReadNextSampleFrame()) != null)
{
for (var n = 0; n < buffer.Length; n++)
{
max = Math.Max(max, Math.Abs(buffer[n]));
}
}
return max;
}
}
public Play2(string file)
{
WaveFileReader reader = new WaveFileReader(file);
frame = (int)reader.Length / 2;
sampleBufferL = new double[frame];
sampleBufferR = new double[frame];
float[] buffer;
while ((buffer = reader.ReadNextSampleFrame()) != null)
{
for (int i = 0; i*2 < buffer.Length; i++)
{
sampleBufferL[n] = buffer[i*2];
sampleBufferR[n] = buffer[i*2+1];
}
n++;
}
WaveFormat format = reader.WaveFormat;
ch = format.Channels;
n = 0;
speed = 1;
}
public Play(string file)
{
WaveFileReader reader = new WaveFileReader(file);
sampleBuffer = new double[reader.Length];
float[] buffer;
while ((buffer = reader.ReadNextSampleFrame()) != null)
{
for (int i = 0; i < buffer.Length; i++)
{
sampleBuffer[n++] = buffer[i];
}
}
WaveFormat format = reader.WaveFormat;
ch = format.Channels;
frame = sampleBuffer.Length / ch;
n = 0;
speed = 1;
}
private IEnumerable<float[]> LoadSamplesWav(string aPath)
{
using (var reader = new WaveFileReader(aPath))
{
var frames = new List<float[]>();
while (true)
{
var frame = reader.ReadNextSampleFrame();
if (frame == null)
{
return frames;
}
frames.Add(frame);
}
}
}
/// <summary>指定したパーセンテージで音量を増減させた新しいwavデータを生成します。</summary>
/// <param name="wav">元のwavデータ</param>
/// <param name="factorPercent">音量のパーセンテージ(0～200くらいを想定)</param>
/// <returns>音量を変更したあとのwavデータ</returns>
public static byte[] ChangeVolume(byte[] wav, int factorPercent)
{
var result = new byte[wav.Length];
using (var msIn = new MemoryStream(wav))
using (var fr = new WaveFileReader(msIn))
using (var msOut = new MemoryStream(result))
using (var fw = new WaveFileWriter(msOut, fr.WaveFormat))
{
var allVolumes = new List<float>();
while (fr.CurrentTime < fr.TotalTime)
{
var vs = fr.ReadNextSampleFrame();
foreach (var v in vs)
{
allVolumes.Add(v);
}
}
fw.WriteSamples(
allVolumes.Select(v => v * factorPercent / 100.0f).ToArray(),
0,
allVolumes.Count
);
}
return result;
}
private List<float> getWavWaveForm(WaveFileReader reader)
{
List<float> data = new List<float>();
float[] buffer;
while ((buffer = reader.ReadNextSampleFrame()) != null)
{
data.Add(buffer[0]);
}
return data;
}
public static void HighPassFilter(string innPath, string outtPath)
{
string inPath = "C:\\Users\\Administratorius\\Documents\\GitHub\\MusicEditor\\PawellsMusicEditor\\PawellsMusicEditor\\Content\\Songs\\NowEdited.WAV";
string outPath = "C:\\Users\\Administratorius\\Documents\\GitHub\\MusicEditor\\PawellsMusicEditor\\PawellsMusicEditor\\Content\\Songs\\NowEdited3.WAV";
Mp3ToWav(innPath, inPath);
WaveFileReader reader = new WaveFileReader(inPath);
var myFilter = BiQuadFilter.HighPassFilter(44F, 10F, 0.5F);
WaveFileWriter writer = new WaveFileWriter(outPath, reader.WaveFormat);
reader.Position = 0;
var endPos = reader.Length;
while (reader.Position < endPos)
{
int bytesRequired = (int)(endPos - reader.Position);
if (bytesRequired > 0)
{
float[] sample = new float[4];
for (int i = 0; i < 2; i++)
{
sample[i] = myFilter.Transform(reader.ReadNextSampleFrame()[i]);
}
writer.WriteSamples(sample, 0, 4);
}
}
reader.Dispose();
writer.Dispose();
ConvertWavToMp3(outPath, outtPath);
File.Delete(inPath);
File.Delete(outPath);
}