internal async Task <MediaStreamSample> GetNextSampleAsync(CancellationToken cancelToken)
{
if (sampleProvider == null)
{
sampleProvider = AudioProviderFactory.GetAudioProvider(shoutcastStream.AudioInfo.AudioFormat);
}
//todo check for internet connection and socket connection as well
cancelToken.ThrowIfCancellationRequested();
MediaStreamSample sample = null;
uint sampleLength = 0;
//if metadataPos is less than sampleSize away from metadataInt
if (shoutcastStream.serverSettings.RequestSongMetdata && (shoutcastStream.metadataInt - metadataPos <= sampleProvider.GetSampleSize() &&
shoutcastStream.metadataInt - metadataPos > 0))
{
//parse part of the frame.
byte[] partialFrame = new byte[shoutcastStream.metadataInt - metadataPos];
var read = await socket.LoadAsync(shoutcastStream.metadataInt - metadataPos);
if (read == 0 || read < partialFrame.Length)
{
//disconnected.
throw new ShoutcastDisconnectionException();
}
await socket.ReadBytesAsync(partialFrame);
metadataPos += shoutcastStream.metadataInt - metadataPos;
Tuple <MediaStreamSample, uint> result = await sampleProvider.ParseSampleAsync(this, socket, partial : true, partialBytes : partialFrame).ConfigureAwait(false);
sample = result.Item1;
sampleLength = result.Item2;
cancelToken.ThrowIfCancellationRequested();
}
else
{
await HandleMetadataAsync(cancelToken);
Tuple <MediaStreamSample, uint> result = await sampleProvider.ParseSampleAsync(this, socket).ConfigureAwait(false);
sample = result.Item1;
sampleLength = result.Item2;
cancelToken.ThrowIfCancellationRequested();
if (sample == null || sampleLength == 0) //OLD bug: on RELEASE builds, sample.Buffer causes the app to die due to a possible .NET Native bug
{
//MediaStreamSource.NotifyError(MediaStreamSourceErrorStatus.DecodeError);
//deferral.Complete();
//return;
return(null);
}
else
{
if (shoutcastStream.serverSettings.RequestSongMetdata)
{
metadataPos += sampleLength;
}
}
}
return(sample);
}
