protected override void RipLoop(Domain.BufferedStream bufferedStream)
{
_currentFrame = Mp3Frame.LoadFromStream(bufferedStream);
if (_currentFrame == null)
{
throw new RipFailedException($"Failed to stream from '{CurrentStreamSource.StreamUrl}. The stream is either down or not a MP3 compatible stream.");
}
if (_decompressor == null)
{
// don't think these details matter too much - just help ACM select the right codec
// however, the buffered provider doesn't know what sample rate it is working at
// until we have a frame
_waveFormat = new Mp3WaveFormat(
_currentFrame.SampleRate,
_currentFrame.ChannelMode == ChannelMode.Mono ? 1 : 2,
_currentFrame.FrameLength,
_currentFrame.BitRate
);
_decompressor = new AcmMp3FrameDecompressor(_waveFormat);
//var appSetting = AppSettings.Current;
//if(appSetting.RecordBacktrackSeconds > 0) {
// // ms per frame = (samples per frame / sample rate(in hz)) * 1000
// var backFrameStackSize = (appSetting.RecordBacktrackSeconds * 1000) / (((float)_currentFrame.SampleCount / (float)_currentFrame.SampleRate) * 1000);
// BackFrames = new PipeQueue<FrameDecompressedEventArgs<Mp3Frame>>((int)Math.Ceiling(backFrameStackSize));
//}
}
int decompressed = _decompressor.DecompressFrame(_currentFrame, _buffer, 0);
RaiseFrameDecompressed(_currentFrame, _waveFormat, _decompressor.OutputFormat, _buffer, decompressed);
}
protected abstract void RipLoop(Domain.BufferedStream bufferedStream);
public void StartRip(StreamSource streamSource)
{
if (State != StreamRipperStates.Stopped)
{
throw new InvalidOperationException("The ripper is already running or not fully stopped yet.");
}
_worker = new BackgroundWorker();
_worker.RunWorkerCompleted += (sender, e) => {
if (_streamEnded != null)
{
_streamEnded(e.Error);
}
};
_worker.DoWork += (sender, e) => {
var req = (HttpWebRequest)HttpWebRequest.Create(streamSource.StreamUrl);
HttpWebResponse resp;
try {
resp = (HttpWebResponse)req.GetResponse();
} catch (WebException ex) {
if (ex.Status != WebExceptionStatus.RequestCanceled)
{
throw;
}
return;
}
try {
_stopHandle = new EventWaitHandle(false, EventResetMode.ManualReset);
State = StreamRipperStates.Running;
CurrentStreamSource = streamSource;
using (var responseStream = resp.GetResponseStream()) {
var bufferedStream = new Domain.BufferedStream(responseStream);
do
{
RipLoop(bufferedStream);
if (_worker.CancellationPending)
{
e.Cancel = true;
break;
}
} while(State == StreamRipperStates.Running);
}
} catch (EndOfStreamException) {
// reached the end of the MP3 file / stream
} catch (WebException) {
// probably we have aborted download from the GUI thread
} finally {
RipLoopCleanup();
State = StreamRipperStates.Stopped;
_stopHandle.Set();
}
};
_worker.RunWorkerAsync();
}
