public bool Read(ArraySegment <float> samples)
{
// Start the timer when the first sample is read. All subsequent timing will be based off this.
if (!_timer.IsRunning)
{
_timer.Reset();
_timer.Start();
}
// We always read the amount of requested data, update the count of total data read now
_totalSamplesRead += samples.Count;
// If the buffer is too small slighty increase the count of samples read (by 0.1ms) Desync compensation will think it is ahead of
// where it should be and will slow down playback, which will cause the buffer to grow.
if (_pipeline.BufferCount < 1)
{
_totalSamplesRead += WaveFormat.SampleRate / 10000;
}
// Calculate how out of sync playback is (based on actual samples read vs time passed)
_desync.Update(IdealPlaybackPosition, PlaybackPosition);
// If playback rate is too fast, slow down immediately (to prevent exhausting the buffer). If playback speed is too slow, ramp up over the next few frames.
var corrected = _desync.CorrectedPlaybackSpeed;
PlaybackRate = corrected < PlaybackRate
? corrected
: Mathf.LerpUnclamped(PlaybackRate, _desync.CorrectedPlaybackSpeed, 0.25f);
// Skip audio if necessary to resync the audio stream
int skippedSamples;
int skippedMilliseconds;
var complete = Skip(_desync.DesyncMilliseconds, out skippedSamples, out skippedMilliseconds);
if (skippedSamples > 0)
{
_totalSamplesRead += skippedSamples;
_desync.Skip(skippedMilliseconds);
}
// If skipping completed the session return silence
if (complete)
{
// ReSharper disable once AssignNullToNotNullAttribute
Array.Clear(samples.Array, samples.Offset, samples.Count);
return(true);
}
// Read from upstream
return(_upstream.Read(samples));
}
public bool Read(ArraySegment <float> samples)
{
// If synchroniser is not enabled just pass the request upstream with no playback rate adjustment
if (!_enabled)
{
PlaybackRate = 1;
return(_upstream.Read(samples));
}
// Start the timer when the first sample is read. All subsequent timing will be based off this.
if (!_timer.IsRunning)
{
_timer.Reset();
_timer.Start();
}
// We always read the amount of requested data, update the count of total data read now
_totalSamplesRead += samples.Count;
// Calculate how out of sync playback is (based on actual samples read vs time passed)
_desync.Update(IdealPlaybackPosition, PlaybackPosition);
// If playback rate is too fast, slow down immediately (to prevent exhausting the buffer). If playback speed is too slow, ramp up over the next few frames.
var corrected = _desync.CorrectedPlaybackSpeed;
PlaybackRate = corrected < PlaybackRate
? corrected
: Mathf.LerpUnclamped(PlaybackRate, _desync.CorrectedPlaybackSpeed, 0.25f);
// Skip audio if necessary to resync the audio stream
int skippedSamples;
int skippedMilliseconds;
var complete = Skip(_desync.DesyncMilliseconds, out skippedSamples, out skippedMilliseconds);
if (skippedSamples > 0)
{
_totalSamplesRead += skippedSamples;
_desync.Skip(skippedMilliseconds);
}
// If skipping completed the session return silence
if (complete)
{
// ReSharper disable once AssignNullToNotNullAttribute
Array.Clear(samples.Array, samples.Offset, samples.Count);
return(true);
}
// Read from upstream
return(_upstream.Read(samples));
}
public void OnAudioFilterRead(float[] data, int channels)
{
//If there is no session, clear filter and early exit
var maybeSession = Session;
if (!maybeSession.HasValue)
{
Array.Clear(data, 0, data.Length);
return;
}
_sessionLock.EnterUpgradeableReadLock();
try
{
//Check if there is no session again, this time protected by a lock
maybeSession = Session;
if (!maybeSession.HasValue)
{
Array.Clear(data, 0, data.Length);
return;
}
//Detect if the session has changed since the last call to this method, if so reset
if (!maybeSession.Value.Context.Equals(_lastPlayedSessionContext))
{
_lastPlayedSessionContext = maybeSession.Value.Context;
ApplyReset();
}
//Calculate the difference between where we should be and where we are (in samples)
var session = maybeSession.Value;
_desync.Update(IdealPlaybackPosition, PlaybackPosition);
//If necessary skip samples to bring us back in sync
int deltaDesync, deltaSamples;
var complete = Skip(session, _desync.DesyncMilliseconds, out deltaSamples, out deltaDesync);
Interlocked.Add(ref _totalSamplesRead, deltaSamples);
_desync.Skip(deltaDesync);
//If the session wasn't completed by the skip, keep playing
if (!complete)
{
int samples;
float arv;
complete = Filter(session, data, channels, _temp, _diagnosticOutput, out arv, out samples, MultiplyBySource);
_arv = arv;
Interlocked.Add(ref _totalSamplesRead, samples);
}
//Clean up now that this session is complete
if (complete)
{
Log.Debug("Finished playback of speech session. id={0}", session.Context.Id);
//Clear the session
_sessionLock.EnterWriteLock();
try
{
Session = null;
}
finally
{
_sessionLock.ExitWriteLock();
}
//Reset the state
ApplyReset();
//Discard the diagnostic recorder if necessary
if (_diagnosticOutput != null)
{
_diagnosticOutput.Dispose();
_diagnosticOutput = null;
}
}
}
finally
{
_sessionLock.ExitUpgradeableReadLock();
}
}