internal static void ReadWriteParallel(this ISampleDecoder decoder, ISampleConsumer consumer, CancellationToken cancelToken, bool samplesAreManuallyFreed)
{
Contract.Requires(decoder != null);
Contract.Requires(consumer != null);
using (var outputQueue = new BlockingCollection <SampleCollection>(10))
{
Task decode = Task.Run(() =>
{
SampleCollection samples;
do
{
cancelToken.ThrowIfCancellationRequested();
samples = decoder.DecodeSamples();
outputQueue.Add(samples);
} while (!samples.IsLast);
}).ContinueWith(task => outputQueue.CompleteAdding());
foreach (SampleCollection queuedSamples in outputQueue.GetConsumingEnumerable(cancelToken))
{
consumer.Submit(queuedSamples);
if (!samplesAreManuallyFreed)
{
SampleCollectionFactory.Instance.Free(queuedSamples);
}
}
// This will re-throw any decoding exceptions:
decode.Wait();
}
}
public void Start()
{
triggerState = true;
if (decoder == null)
{
decoder = ISampleDecoder.Alloc();
}
}
public void Stop()
{
triggerState = false;
stopped = true;
if (decoder != null)
{
ISampleDecoder.Free(decoder); decoder = null;
}
}
void DoAnalyze(ISampleAnalyzer sampleAnalyzer, CancellationToken cancelToken, GroupToken groupToken)
{
Contract.Requires(sampleAnalyzer != null);
Contract.Requires(groupToken != null);
sampleAnalyzer.Initialize(AudioInfo, groupToken);
using (FileStream fileStream = FileInfo.OpenRead())
{
// Try each decoder that supports this file extension:
foreach (ExportFactory <ISampleDecoder> decoderFactory in
ExtensionProvider.GetFactories <ISampleDecoder>("Extension", FileInfo.Extension))
{
try
{
using (ExportLifetimeContext <ISampleDecoder> decoderLifetime = decoderFactory.CreateExport())
{
ISampleDecoder sampleDecoder = decoderLifetime.Value;
sampleDecoder.Initialize(fileStream);
sampleDecoder.ReadWriteParallel(sampleAnalyzer, cancelToken,
sampleAnalyzer.ManuallyFreesSamples);
sampleAnalyzer.GetResult().CopyTo(Metadata);
return;
}
}
catch (UnsupportedAudioException)
{
// If a decoder wasn't supported, rewind the stream and try another:
fileStream.Position = 0;
}
}
}
throw new UnsupportedAudioException(Resources.AudioFileDecodeError);
}
void DoExport(ISampleEncoder encoder, Stream outputStream, SettingsDictionary settings, CancellationToken cancelToken)
{
Contract.Requires(encoder != null);
Contract.Requires(outputStream != null);
Contract.Requires(settings != null);
encoder.Initialize(outputStream, AudioInfo, Metadata, settings);
using (FileStream inputStream = FileInfo.OpenRead())
{
// Try each decoder that supports this file extension:
foreach (ExportFactory <ISampleDecoder> decoderFactory in
ExtensionProvider.GetFactories <ISampleDecoder>("Extension", FileInfo.Extension))
{
try
{
using (ExportLifetimeContext <ISampleDecoder> decoderLifetime = decoderFactory.CreateExport())
{
ISampleDecoder sampleDecoder = decoderLifetime.Value;
sampleDecoder.Initialize(inputStream);
sampleDecoder.ReadWriteParallel(encoder, cancelToken, encoder.ManuallyFreesSamples);
return;
}
}
catch (UnsupportedAudioException)
{
// If a decoder wasn't supported, rewind the stream and try another:
inputStream.Position = 0;
}
}
throw new UnsupportedAudioException(Resources.AudioFileDecodeError);
}
}
public SoundChannel()
{
decoder = null;
Clear();
}
