async Task <Stream> openStream(Part part, StreamParameters parameters, AsyncOperationInfo operationInfo)
{
var baseStream = new FileStream(_path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, parameters.ReadBufferSize);
baseStream.Position = part.Position;
return(new SectionedStreamProxy(baseStream, part.Length));
}
public static ErrorCode Terminate()
{
ErrorCode c = (ErrorCode)Pa_Terminate();
if (c == ErrorCode.NoError)
{
foreach (Tuple <IntPtr, IntPtr> v in StreamParameters.Values)
{
NativeMemoryUtils.Free(v.Item1);
NativeMemoryUtils.Free(v.Item2);
}
StreamParameters.Clear();
StreamCallbacks.Clear();
StreamUserDatas.Clear();
UserDataObjects.Clear();
NativeMemoryUtils.FreeAll();
}
return(c);
}
/// <summary>
/// Starts the media capturing/source devices.
/// </summary>
public override async Task Start()
{
if (!_isStarted)
{
_sendingAudioFormat = base.GetSendingFormat(SDPMediaTypesEnum.audio);
_isStarted = true;
await base.Start();
PortAudio.Initialize();
var outputDevice = PortAudio.DefaultOutputDevice;
if (outputDevice == PortAudio.NoDevice)
{
throw new ApplicationException("No audio output device available.");
}
else
{
StreamParameters stmInParams = new StreamParameters {
device = 0, channelCount = 2, sampleFormat = SampleFormat.Float32
};
StreamParameters stmOutParams = new StreamParameters {
device = outputDevice, channelCount = 2, sampleFormat = SampleFormat.Float32
};
// Combined audio capture and render.
_audioIOStream = new Stream(stmInParams, stmOutParams, AUDIO_SAMPLING_RATE, AUDIO_SAMPLE_BUFFER_LENGTH, StreamFlags.NoFlag, AudioSampleAvailable, null);
_audioIOStream.Start();
}
if (_rtpAudioTimestampPeriod == 0)
{
_rtpAudioTimestampPeriod = (uint)(SDPMediaFormatInfo.GetClockRate(SDPMediaFormatsEnum.PCMU) / AUDIO_SAMPLE_BUFFER_LENGTH);
}
}
}