/// <summary>
/// Starts playing back audio.
/// </summary>
private void OnPipelineRun()
{
this.audioDevice = LinuxAudioInterop.Open(
this.configuration.DeviceName,
LinuxAudioInterop.Mode.Playback,
(int)this.configuration.Format.SamplesPerSec,
this.configuration.Format.Channels,
LinuxAudioInterop.ConvertFormat(this.configuration.Format));
}
/// <inheritdoc/>
public void Start(Action <DateTime> notifyCompletionTime)
{
// notify that this is an infinite source component
notifyCompletionTime(DateTime.MaxValue);
this.audioDevice = LinuxAudioInterop.Open(
this.configuration.DeviceName,
LinuxAudioInterop.Mode.Capture,
(int)this.configuration.Format.SamplesPerSec,
this.configuration.Format.Channels,
LinuxAudioInterop.ConvertFormat(this.configuration.Format));
this.background = new Thread(new ThreadStart(() =>
{
const int blockSize = 256;
var format = this.configuration.Format;
var length = blockSize * format.BitsPerSample / 8;
var buf = new byte[length];
while (!this.isStopping)
{
try
{
LinuxAudioInterop.Read(this.audioDevice, buf, blockSize);
}
catch
{
if (this.audioDevice != null)
{
throw;
}
}
// Only create a new buffer if necessary
if ((this.buffer.Data == null) || (this.buffer.Length != length))
{
this.buffer = new AudioBuffer(length, format);
}
// Copy the data
Array.Copy(buf, this.buffer.Data, length);
// use the end of the last sample in the packet as the originating time
DateTime originatingTime = this.pipeline.GetCurrentTime().AddSeconds((double)length / format.AvgBytesPerSec);
// post the data to the output stream
this.audioBuffers.Post(this.buffer, originatingTime);
}
}))
{
IsBackground = true
};
this.isStopping = false;
this.background.Start();
}
/// <summary>
/// Called to start capturing audio from the microphone.
/// </summary>
private void OnPipelineStart()
{
this.audioDevice = LinuxAudioInterop.Open(
this.configuration.DeviceName,
LinuxAudioInterop.Mode.Capture,
(int)this.configuration.Format.SamplesPerSec,
this.configuration.Format.Channels,
LinuxAudioInterop.ConvertFormat(this.configuration.Format));
new Thread(new ThreadStart(() =>
{
const int blockSize = 256;
var format = this.configuration.Format;
var length = blockSize * format.BitsPerSample / 8;
var buf = new byte[length];
while (this.audioDevice != null)
{
try
{
LinuxAudioInterop.Read(this.audioDevice, buf, blockSize);
}
catch (Exception ex)
{
if (this.audioDevice != null)
{
throw ex;
}
}
// Only create a new buffer if necessary
if ((this.buffer.Data == null) || (this.buffer.Length != length))
{
this.buffer = new AudioBuffer(length, format);
}
// Copy the data
Array.Copy(buf, this.buffer.Data, length);
// use the end of the last sample in the packet as the originating time
DateTime originatingTime = this.pipeline.GetCurrentTime().AddSeconds(length / format.AvgBytesPerSec);
// post the data to the output stream
this.audioBuffers.Post(this.buffer, originatingTime);
}
}))
{
IsBackground = true
}.Start();
}