/// <summary>
/// Helper function to go from IWaveProvider to a SampleProvider
/// Must already be PCM or IEEE float
/// </summary>
/// <param name="waveProvider">The WaveProvider to convert</param>
/// <returns>A sample provider</returns>
public static ISampleProvider ConvertWaveProviderIntoSampleProvider(IWaveProvider waveProvider)
{
ISampleProvider sampleProvider;
if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
// go to float
if (waveProvider.WaveFormat.BitsPerSample == 8)
{
sampleProvider = new Pcm8BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 16)
{
sampleProvider = new Pcm16BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 24)
{
sampleProvider = new Pcm24BitToSampleProvider(waveProvider);
}
else
{
throw new InvalidOperationException("Unsupported operation");
}
}
else if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
sampleProvider = new WaveToSampleProvider(waveProvider);
}
else
{
throw new ArgumentException("Unsupported source encoding");
}
return sampleProvider;
}
public static SampleSource CreateFromWaveFile(string fileName)
{
using (var reader = new WaveFileReader(fileName))
{
ISampleProvider sp;
int sourceSamples;
if (reader.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
if (reader.WaveFormat.BitsPerSample == 16)
{
sp = new Pcm16BitToSampleProvider(reader);
sourceSamples = (int)(reader.Length / 2);
}
else if (reader.WaveFormat.BitsPerSample == 24)
{
sp = new Pcm24BitToSampleProvider(reader);
sourceSamples = (int)(reader.Length / 3);
}
else
{
throw new ArgumentException("Currently only 16 or 24 bit PCM samples are supported");
}
}
else if (reader.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
sp = new WaveToSampleProvider(reader);
sourceSamples = (int)(reader.Length / 4);
}
else
{
throw new ArgumentException("Must be PCM or IEEE float");
}
float[] sampleData = new float[sourceSamples];
int n = sp.Read(sampleData, 0, sourceSamples);
if (n != sourceSamples)
{
throw new InvalidOperationException(String.Format("Couldn't read the whole sample, expected {0} samples, got {1}", n, sourceSamples));
}
SampleSource ss = new SampleSource(sampleData, sp.WaveFormat);
return ss;
}
}
/// <summary>
/// Helper function to go from IWaveProvider to a SampleProvider
/// Must already be PCM or IEEE float
/// </summary>
/// <param name="waveProvider">The WaveProvider to convert</param>
/// <returns>A sample provider</returns>
public static ISampleProvider ConvertWaveProviderIntoSampleProvider(IWaveProvider waveProvider)
{
ISampleProvider sampleProvider;
if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
// go to float
if (waveProvider.WaveFormat.BitsPerSample == 8)
{
sampleProvider = new Pcm8BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 16)
{
sampleProvider = new Pcm16BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 24)
{
sampleProvider = new Pcm24BitToSampleProvider(waveProvider);
}
else
{
throw new InvalidOperationException("Unsupported operation");
}
}
else if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
sampleProvider = new WaveToSampleProvider(waveProvider);
}
else
{
throw new ArgumentException("Unsupported source encoding");
}
return(sampleProvider);
}
public static float[] BuildPeaks(UWavePart part, System.ComponentModel.BackgroundWorker worker)
{
const double peaksRate = 4000;
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
sw.Start();
float[] peaks;
using (var stream = new AudioFileReader(part.FilePath))
{
int channels = part.Channels;
double peaksSamples = (int)((double)stream.Length / stream.WaveFormat.BlockAlign / stream.WaveFormat.SampleRate * peaksRate);
peaks = new float[(int)(peaksSamples + 1) * channels];
double blocksPerPixel = stream.Length / stream.WaveFormat.BlockAlign / peaksSamples;
var converted = new WaveToSampleProvider(stream);
float[] buffer = new float[4096];
int readed;
int readPos = 0;
int peaksPos = 0;
double bufferPos = 0;
float lmax = 0, lmin = 0, rmax = 0, rmin = 0;
while ((readed = converted.Read(buffer, 0, 4096)) != 0)
{
readPos += readed;
for (int i = 0; i < readed; i += channels)
{
lmax = Math.Max(lmax, buffer[i]);
lmin = Math.Min(lmin, buffer[i]);
if (channels > 1)
{
rmax = Math.Max(rmax, buffer[i + 1]);
rmin = Math.Min(rmin, buffer[i + 1]);
}
if (i > bufferPos)
{
lmax = -lmax; lmin = -lmin; rmax = -rmax; rmin = -rmin; // negate peaks to fipped waveform
peaks[peaksPos * channels] = lmax == 0 ? lmin : lmin == 0 ? lmax : (lmin + lmax) / 2;
peaks[peaksPos * channels + 1] = rmax == 0 ? rmin : rmin == 0 ? rmax : (rmin + rmax) / 2;
peaksPos++;
lmax = lmin = rmax = rmin = 0;
bufferPos += blocksPerPixel * stream.WaveFormat.Channels;
}
}
bufferPos -= readed;
worker.ReportProgress((int)((double)readPos * sizeof(float) * 100 / stream.Length));
}
}
sw.Stop();
System.Diagnostics.Debug.WriteLine("Build peaks {0} ms", sw.Elapsed.TotalMilliseconds);
return peaks;
}
public static ISampleProvider ConvertWaveProviderIntoSampleProvider(IWaveProvider waveProvider)
{
ISampleProvider result;
if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
if (waveProvider.WaveFormat.BitsPerSample == 8)
{
result = new Pcm8BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 16)
{
result = new Pcm16BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 24)
{
result = new Pcm24BitToSampleProvider(waveProvider);
}
else
{
if (waveProvider.WaveFormat.BitsPerSample != 32)
{
throw new InvalidOperationException("Unsupported bit depth");
}
result = new Pcm32BitToSampleProvider(waveProvider);
}
}
else
{
if (waveProvider.WaveFormat.Encoding != WaveFormatEncoding.IeeeFloat)
{
throw new ArgumentException("Unsupported source encoding");
}
if (waveProvider.WaveFormat.BitsPerSample == 64)
{
result = new WaveToSampleProvider64(waveProvider);
}
else
{
result = new WaveToSampleProvider(waveProvider);
}
}
return(result);
}
/// <summary>
/// Initialises a new instance of SampleChannel
/// </summary>
/// <param name="waveProvider">Source wave provider, must be PCM or IEEE</param>
public SampleChannel(IWaveProvider waveProvider)
{
ISampleProvider sampleProvider;
if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
// go to float
if (waveProvider.WaveFormat.BitsPerSample == 8)
{
sampleProvider = new Pcm8BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 16)
{
sampleProvider = new Pcm16BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 24)
{
sampleProvider = new Pcm24BitToSampleProvider(waveProvider);
}
else
{
throw new InvalidOperationException("Unsupported operation");
}
}
else if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
sampleProvider = new WaveToSampleProvider(waveProvider);
}
else
{
throw new ArgumentException("Unsupported source encoding");
}
if (sampleProvider.WaveFormat.Channels == 1)
{
sampleProvider = new MonoToStereoSampleProvider(sampleProvider);
}
this.waveFormat = sampleProvider.WaveFormat;
// let's put the meter before the volume (useful for drawing waveforms)
this.preVolumeMeter = new MeteringSampleProvider(sampleProvider);
this.volumeProvider = new VolumeSampleProvider(preVolumeMeter);
}
/// <summary>
/// Initialises a new instance of SampleChannel
/// </summary>
/// <param name="waveProvider">Source wave provider, must be PCM or IEEE</param>
public SampleChannel(IWaveProvider waveProvider)
{
ISampleProvider sampleProvider;
if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
// go to float
if (waveProvider.WaveFormat.BitsPerSample == 8)
{
sampleProvider = new Pcm8BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 16)
{
sampleProvider = new Pcm16BitToSampleProvider(waveProvider);
}
else if (waveProvider.WaveFormat.BitsPerSample == 24)
{
sampleProvider = new Pcm24BitToSampleProvider(waveProvider);
}
else
{
throw new InvalidOperationException("Unsupported operation");
}
}
else if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
sampleProvider = new WaveToSampleProvider(waveProvider);
}
else
{
throw new ArgumentException("Unsupported source encoding");
}
if (sampleProvider.WaveFormat.Channels == 1)
{
sampleProvider = new MonoToStereoSampleProvider(sampleProvider);
}
this.waveFormat = sampleProvider.WaveFormat;
// let's put the meter before the volume (useful for drawing waveforms)
this.preVolumeMeter = new MeteringSampleProvider(sampleProvider);
this.volumeProvider = new VolumeSampleProvider(preVolumeMeter);
}
private void _play()
{
/* Audio chain */
// Sampling
_wavesampler = new WaveToSampleProvider(new Wave16ToFloatProvider(_wavebuffer));
// Fading component
_fade = new FadeInOutSampleProvider(_wavesampler);
_fade.BeginFadeIn(1500);
// Notifying component
var _notify = new NotifyingSampleProvider(_fade);
_notify.Sample += new EventHandler<SampleEventArgs>(_notify_Sample);
// Gain adjustment component
_volume = new VolumeSampleProvider(_notify);
_volume.Volume = this.Volume;
// Output
Output.Init(new SampleToWaveProvider16(_volume));
/* Playback loop */
do
{
if (_cancel_play.IsCancellationRequested)
{
Console.WriteLine("[Playback thread] Cancellation requested.");
// Fade out and stop
Console.WriteLine("[Playback thread] Fading out and stopping...");
_fade.BeginFadeOut(500);
Thread.Sleep(500);
Output.Stop();
Console.WriteLine("[Playback thread] Output stopped.");
this.Status = StreamStatus.Stopped;
Console.WriteLine("[Playback thread] Acknowledged as status.");
//_cancel_play_token.ThrowIfCancellationRequested();
//Console.WriteLine("[Playback thread] WARNING: Cancellation token is not cleanly set!");
return;
}
if (Output.PlaybackState != PlaybackState.Playing && _wavebuffer.BufferedDuration.TotalMilliseconds > 2750)
{
// Buffer is filled enough
Console.WriteLine("[Playback thread] Buffer is okay now, start playback!");
this.Status = StreamStatus.Playing;
Output.Play();
}
else if (Output.PlaybackState == PlaybackState.Playing && _wavebuffer.BufferedDuration.TotalMilliseconds < 2250)
{
// Buffer is underrunning
Console.WriteLine("[Playback thread] Buffer is underrunning, pausing playback...");
this.Status = StreamStatus.Buffering;
Output.Pause();
}
if (_bufferThread.Exception != null)
{
Console.WriteLine("[Playback thread] Buffering thread is faulted, aborting playback");
throw new Exception("Buffering thread faulted, aborting playback");
}
Thread.Sleep(100);
}
while (true);
}
public static SampleSource[] CreateFromWaveFile(string fileName)
{
using (var reader = new WaveFileReader(fileName))
{
ISampleProvider sp;
int sourceSamples;
if (reader.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
{
if (reader.WaveFormat.BitsPerSample == 16)
{
sp = new Pcm16BitToSampleProvider(reader);
sourceSamples = (int)(reader.Length / 2);
}
else if (reader.WaveFormat.BitsPerSample == 24)
{
sp = new Pcm24BitToSampleProvider(reader);
sourceSamples = (int)(reader.Length / 3);
}
else
{
throw new ArgumentException("Currently only 16 or 24 bit PCM samples are supported");
}
}
else if (reader.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
sp = new WaveToSampleProvider(reader);
sourceSamples = (int)(reader.Length / 4);
}
else
{
throw new ArgumentException("Must be PCM or IEEE float");
}
float[] sampleData = new float[sourceSamples];
int n = sp.Read(sampleData, 0, sourceSamples);
if (n != sourceSamples)
{
throw new InvalidOperationException(String.Format("Couldn't read the whole sample, expected {0} samples, got {1}", n, sourceSamples));
}
SampleSource[] result = new SampleSource[9];
// Normal pitch
int normal = 4;
result[normal] = new SampleSource(sampleData, sp.WaveFormat);
int pitch = 5;
for (int currentPitch = 0; currentPitch < normal; currentPitch++, pitch--)
{
float[] changedPitchData = new float[sampleData.Length/pitch];
for (int j = 0, i = 0; i < sampleData.Length && j < changedPitchData.Length; i++)
{
if (i % pitch == 0)
{
changedPitchData[j] = sampleData[i];
j++;
}
}
result[currentPitch] = new SampleSource(changedPitchData, sp.WaveFormat);
}
pitch = 2;
for (int currentPitch = normal+1; currentPitch < result.Length; currentPitch++, pitch++)
{
float[] changedPitchData = new float[sampleData.Length * pitch];
for (int j = 0, i = 0; i < sampleData.Length && j < changedPitchData.Length; j++)
{
changedPitchData[j] = sampleData[i];
if (j % pitch == 0)
{
i++;
}
}
result[currentPitch] = new SampleSource(changedPitchData, sp.WaveFormat);
}
return result;
}
}
