/// <summary>
/// The heart of Practice# audio processing:
/// 1. Reads chunks of uncompressed samples from the input file
/// 2. Processes the samples using SoundTouch
/// 3. Receive process samples from SoundTouch
/// 4. Play the processed samples with NAudio
///
/// Also handles logic required for dynamically changing values on-the-fly of: Volume, Loop, Cue, Current Play Position.
/// </summary>
private void ProcessAudio()
{
m_stopWorker = false;
m_logger.Debug("ProcessAudio() started");
#region Setup
WaveFormat format = m_waveChannel.WaveFormat;
int bufferSecondLength = format.SampleRate * format.Channels;
byte[] inputBuffer = new byte[BufferSamples * sizeof(float)];
byte[] soundTouchOutBuffer = new byte[BufferSamples * sizeof(float)];
ByteAndFloatsConverter convertInputBuffer = new ByteAndFloatsConverter { Bytes = inputBuffer };
ByteAndFloatsConverter convertOutputBuffer = new ByteAndFloatsConverter { Bytes = soundTouchOutBuffer };
uint outBufferSizeFloats = (uint)convertOutputBuffer.Bytes.Length / (uint)(sizeof(float) * format.Channels);
int bytesRead;
int floatsRead;
uint samplesProcessed = 0;
int bufferIndex = 0;
TimeSpan actualEndMarker = TimeSpan.Zero;
bool loop;
#endregion
while (!m_stopWorker && m_waveChannel.Position < m_waveChannel.Length)
{
lock (PropertiesLock)
{
m_waveChannel.Volume = m_volume;
}
#region Read samples from file
// Change current play position
lock (CurrentPlayTimeLock)
{
if (m_newPlayTimeRequested)
{
m_waveChannel.CurrentTime = m_newPlayTime;
m_newPlayTimeRequested = false;
}
}
// *** Read one chunk from input file ***
bytesRead = m_waveChannel.Read(convertInputBuffer.Bytes, 0, convertInputBuffer.Bytes.Length);
// **************************************
floatsRead = bytesRead / ((sizeof(float)) * format.Channels);
#endregion
#region Apply DSP Effects (Equalizer, Vocal Removal, etc.)
ApplyDSPEffects(convertInputBuffer.Floats, floatsRead);
#endregion
#region Apply Time Stretch Profile
lock (PropertiesLock)
{
if (m_timeStretchProfileChanged)
{
ApplySoundTouchTimeStretchProfile();
m_timeStretchProfileChanged = false;
}
}
#endregion
actualEndMarker = this.EndMarker;
loop = this.Loop;
if (!loop || actualEndMarker == TimeSpan.Zero)
actualEndMarker = m_waveChannel.TotalTime;
if (m_waveChannel.CurrentTime > actualEndMarker)
{
#region Flush left over samples
// ** End marker reached **
// Now the input buffer is processed, 'flush' some last samples that are
// hiding in the SoundTouch's internal processing pipeline.
m_soundTouchSharp.Clear();
m_inputProvider.Flush();
m_waveChannel.Flush();
if (!m_stopWorker)
{
while (!m_stopWorker && samplesProcessed != 0)
{
SetSoundSharpValues();
samplesProcessed = m_soundTouchSharp.ReceiveSamples(convertOutputBuffer.Floats, outBufferSizeFloats);
if (samplesProcessed > 0)
{
TimeSpan currentBufferTime = m_waveChannel.CurrentTime;
m_inputProvider.AddSamples(convertOutputBuffer.Bytes, 0, (int)samplesProcessed * sizeof(float) * format.Channels, currentBufferTime);
}
samplesProcessed = m_soundTouchSharp.ReceiveSamples(convertOutputBuffer.Floats, outBufferSizeFloats);
}
}
#endregion
#region Handle Loop & Cue
loop = this.Loop;
if (loop)
{
m_waveChannel.CurrentTime = this.StartMarker;
WaitForCue();
}
else
{
break;
}
#endregion
}
#region Put samples in SoundTouch
SetSoundSharpValues();
// *** Put samples in SoundTouch ***
m_soundTouchSharp.PutSamples(convertInputBuffer.Floats, (uint)floatsRead);
// **********************************************************************
#endregion
#region Receive & Play Samples
// Receive samples from SoundTouch
do
{
// *** Receive samples back from SoundTouch ***
// *** This is where Time Stretching and Pitch Changing are actually done *********
samplesProcessed = m_soundTouchSharp.ReceiveSamples(convertOutputBuffer.Floats, outBufferSizeFloats);
// **********************************************************************
if (samplesProcessed > 0)
{
TimeSpan currentBufferTime = m_waveChannel.CurrentTime;
// ** Play samples that came out of SoundTouch by adding them to AdvancedBufferedWaveProvider - the buffered player
m_inputProvider.AddSamples(convertOutputBuffer.Bytes, 0, (int)samplesProcessed * sizeof(float) * format.Channels, currentBufferTime);
// **********************************************************************
// Wait for queue to free up - only then add continue reading from the file
// >> Note: when paused, loop runs infinitely
while (!m_stopWorker && m_inputProvider.GetQueueCount() > BusyQueuedBuffersThreshold)
{
Thread.Sleep(10);
}
bufferIndex++;
}
} while (!m_stopWorker && samplesProcessed != 0);
#endregion
} // while
#region Stop PlayBack
m_logger.Debug("ProcessAudio() finished - stop playback");
m_waveOutDevice.Stop();
// Stop listening to PlayPositionChanged events
m_inputProvider.PlayPositionChanged -= new EventHandler(inputProvider_PlayPositionChanged);
// Fix to current play time not finishing up at end marker (Wave channel uses positions)
if (!m_stopWorker && CurrentPlayTime < actualEndMarker)
{
lock (CurrentPlayTimeLock)
{
m_currentPlayTime = actualEndMarker;
}
}
// Clear left over buffers
m_soundTouchSharp.Clear();
// Playback status changed to -> Stopped
ChangeStatus(Statuses.Stopped);
#endregion
}
/// <summary>
/// The heart of Practice# audio processing:
/// 1. Reads chunks of uncompressed samples from the input file
/// 2. Processes the samples using SoundTouch
/// 3. Receive process samples from SoundTouch
/// 4. Play the processed samples with NAudio
///
/// Also handles logic required for dynamically changing values on-the-fly of: Volume, Loop, Cue, Current Play Position.
/// </summary>
private void ProcessAudio()
{
m_stopWorker = false;
m_logger.Debug("ProcessAudio() started");
#region Setup
WaveFormat format = m_waveChannel.WaveFormat;
int bufferSecondLength = format.SampleRate * format.Channels;
byte[] inputBuffer = new byte[BufferSamples * sizeof(float)];
byte[] soundTouchOutBuffer = new byte[BufferSamples * sizeof(float)];
ByteAndFloatsConverter convertInputBuffer = new ByteAndFloatsConverter {
Bytes = inputBuffer
};
ByteAndFloatsConverter convertOutputBuffer = new ByteAndFloatsConverter {
Bytes = soundTouchOutBuffer
};
uint outBufferSizeFloats = (uint)convertOutputBuffer.Bytes.Length / (uint)(sizeof(float) * format.Channels);
int bytesRead;
int floatsRead;
uint samplesProcessed = 0;
int bufferIndex = 0;
TimeSpan actualEndMarker = TimeSpan.Zero;
bool loop;
#endregion
while (!m_stopWorker && m_waveChannel.Position < m_waveChannel.Length)
{
lock (PropertiesLock)
{
m_waveChannel.Volume = m_volume;
}
#region Read samples from file
// Change current play position
lock (CurrentPlayTimeLock)
{
if (m_newPlayTimeRequested)
{
m_waveChannel.CurrentTime = m_newPlayTime;
m_newPlayTimeRequested = false;
}
}
// *** Read one chunk from input file ***
bytesRead = m_waveChannel.Read(convertInputBuffer.Bytes, 0, convertInputBuffer.Bytes.Length);
// **************************************
floatsRead = bytesRead / ((sizeof(float)) * format.Channels);
#endregion
#region Apply DSP Effects (Equalizer, Vocal Removal, etc.)
ApplyDSPEffects(convertInputBuffer.Floats, floatsRead);
#endregion
#region Apply Time Stretch Profile
lock (PropertiesLock)
{
if (m_timeStretchProfileChanged)
{
ApplySoundTouchTimeStretchProfile();
m_timeStretchProfileChanged = false;
}
}
#endregion
actualEndMarker = this.EndMarker;
loop = this.Loop;
if (!loop || actualEndMarker == TimeSpan.Zero)
{
actualEndMarker = m_waveChannel.TotalTime;
}
if (m_waveChannel.CurrentTime > actualEndMarker)
{
#region Flush left over samples
// ** End marker reached **
// Now the input buffer is processed, 'flush' some last samples that are
// hiding in the SoundTouch's internal processing pipeline.
m_soundTouchSharp.Clear();
m_inputProvider.Flush();
m_waveChannel.Flush();
if (!m_stopWorker)
{
while (!m_stopWorker && samplesProcessed != 0)
{
SetSoundSharpValues();
samplesProcessed = m_soundTouchSharp.ReceiveSamples(convertOutputBuffer.Floats, outBufferSizeFloats);
if (samplesProcessed > 0)
{
TimeSpan currentBufferTime = m_waveChannel.CurrentTime;
m_inputProvider.AddSamples(convertOutputBuffer.Bytes, 0, (int)samplesProcessed * sizeof(float) * format.Channels, currentBufferTime);
}
samplesProcessed = m_soundTouchSharp.ReceiveSamples(convertOutputBuffer.Floats, outBufferSizeFloats);
}
}
#endregion
#region Handle Loop & Cue
loop = this.Loop;
if (loop)
{
m_waveChannel.CurrentTime = this.StartMarker;
WaitForCue();
}
else
{
break;
}
#endregion
}
#region Put samples in SoundTouch
SetSoundSharpValues();
// *** Put samples in SoundTouch ***
m_soundTouchSharp.PutSamples(convertInputBuffer.Floats, (uint)floatsRead);
// **********************************************************************
#endregion
#region Receive & Play Samples
// Receive samples from SoundTouch
do
{
// *** Receive samples back from SoundTouch ***
// *** This is where Time Stretching and Pitch Changing are actually done *********
samplesProcessed = m_soundTouchSharp.ReceiveSamples(convertOutputBuffer.Floats, outBufferSizeFloats);
// **********************************************************************
if (samplesProcessed > 0)
{
TimeSpan currentBufferTime = m_waveChannel.CurrentTime;
// ** Play samples that came out of SoundTouch by adding them to AdvancedBufferedWaveProvider - the buffered player
m_inputProvider.AddSamples(convertOutputBuffer.Bytes, 0, (int)samplesProcessed * sizeof(float) * format.Channels, currentBufferTime);
// **********************************************************************
// Wait for queue to free up - only then add continue reading from the file
// >> Note: when paused, loop runs infinitely
while (!m_stopWorker && m_inputProvider.GetQueueCount() > BusyQueuedBuffersThreshold)
{
Thread.Sleep(10);
}
bufferIndex++;
}
} while (!m_stopWorker && samplesProcessed != 0);
#endregion
} // while
#region Stop PlayBack
m_logger.Debug("ProcessAudio() finished - stop playback");
m_waveOutDevice.Stop();
// Stop listening to PlayPositionChanged events
m_inputProvider.PlayPositionChanged -= new EventHandler(inputProvider_PlayPositionChanged);
// Fix to current play time not finishing up at end marker (Wave channel uses positions)
if (!m_stopWorker && CurrentPlayTime < actualEndMarker)
{
lock (CurrentPlayTimeLock)
{
m_currentPlayTime = actualEndMarker;
}
}
// Clear left over buffers
m_soundTouchSharp.Clear();
// Playback status changed to -> Stopped
ChangeStatus(Statuses.Stopped);
#endregion
}