/// ------------------------------------------------------------------------------------
/// <summary>
///
/// </summary>
/// <param name="maxMinutes">REVIW: why does this max time even exist? I don't see that it affects buffer size</param>
/// ------------------------------------------------------------------------------------
public AudioRecorder(int maxMinutes)
{
_maxMinutes = maxMinutes;
SampleAggregator = new SampleAggregator();
SampleAggregator.MaximumCalculated += delegate
{
_peakLevelEventArgs.Level = SampleAggregator.maxValue;
if (PeakLevelChanged != null)
{
PeakLevelChanged.BeginInvoke(this, _peakLevelEventArgs, null, null);
}
};
RecordingFormat = new WaveFormat(44100, 1);
}
/// ------------------------------------------------------------------------------------
/// <summary>
///
/// </summary>
/// <param name="maxMinutes">REVIW: why does this max time even exist? I don't see that it affects buffer size</param>
/// ------------------------------------------------------------------------------------
public AudioRecorder(int maxMinutes)
{
_maxMinutes = maxMinutes;
SampleAggregator = new SampleAggregator();
SampleAggregator.MaximumCalculated += delegate
{
_peakLevelEventArgs.Level = SampleAggregator.maxValue;
if (PeakLevelChanged != null)
PeakLevelChanged.BeginInvoke(this, _peakLevelEventArgs, null, null);
};
RecordingFormat = new WaveFormat(44100, 1);
}
/// ------------------------------------------------------------------------------------
protected virtual void waveIn_DataAvailable(object sender, WaveInEventArgs e)
{
/*original from codeplex
* byte[] buffer = e.Buffer;
* int bytesRecorded = e.BytesRecorded;
* WriteToFile(buffer, bytesRecorded);
*
* for (int index = 0; index < e.BytesRecorded; index += 2)
* {
* short sample = (short)((buffer[index + 1] << 8) |
* buffer[index + 0]);
* float sample32 = sample / 32768f;
* _sampleAggregator.Add(sample32);
* }
*/
//David's version:
lock (this)
{
var buffer = e.Buffer;
int bytesRecorded = e.BytesRecorded;
bool hitMaximumFileSize = false;
if (_recordingState == RecordingState.Recording || _recordingState == RecordingState.RequestedStop)
{
Debug.WriteLine("Writing " + bytesRecorded + " bytes of data to file");
hitMaximumFileSize = !WriteToFile(buffer, bytesRecorded);
}
var bytesPerSample = _waveIn.WaveFormat.BitsPerSample / 8;
// It appears the data only occupies 2 bytes of those in a sample and that
// those 2 are always the last two in each sample. The other bytes are zero
// filled. Therefore, when getting those two bytes, the first index into a
// sample needs to be 0 for 16 bit samples, 1 for 24 bit samples and 2 for
// 32 bit samples. I'm not sure what to do for 8 bit samples. I could never
// figure out the correct conversion of a byte in an 8 bit per sample buffer
// to a float sample value. However, I doubt folks are going to be recording
// at 8 bits/sample so I'm ignoring that problem.
for (var index = bytesPerSample - 2; index < bytesRecorded - 1; index += bytesPerSample)
{
var sample = (short)((buffer[index + 1] << 8) | buffer[index]);
var sample32 = sample / 32768f;
SampleAggregator.Add(sample32);
}
if (_fileWriterThread == null)
{
return;
}
// Only fire the progress event every 10th of a second.
var currRecordedTime = (double)_bytesRecorded / _recordingFormat.AverageBytesPerSecond;
if (currRecordedTime - _prevRecordedTime >= 0.05d)
{
_prevRecordedTime = currRecordedTime;
_recProgressEventArgs.RecordedLength = TimeSpan.FromSeconds(currRecordedTime);
if (RecordingProgress != null)
{
RecordingProgress.BeginInvoke(this, _recProgressEventArgs, null, null);
}
}
if (RecordingState == RecordingState.RequestedStop)
{
if (DateTime.Now > _recordingStopTime.AddSeconds(2) || hitMaximumFileSize ||
_recordingStartTime.AddSeconds(currRecordedTime) >= _recordingStopTime)
{
Debug.WriteLine("Transition to monitoring from DataAvailable");
TransitionFromRecordingToMonitoring();
}
}
}
}
