C# IWaveProvider类代码示例

        /// <summary>
        /// WaveStream to resample using the DMO Resampler
        /// </summary>
        /// <param name="inputProvider">Input Stream</param>
        /// <param name="outputFormat">Desired Output Format</param>
        public ResamplerDmoStream(IWaveProvider inputProvider, WaveFormat outputFormat)
        {
            this.inputProvider = inputProvider;
            this.inputStream = inputProvider as WaveStream;
            this.outputFormat = outputFormat;
            this.resampler = new Resampler();
            if (!resampler.MediaObject.SupportsInputWaveFormat(0, inputProvider.WaveFormat))
            {
                throw new ArgumentException("Unsupported Input Stream format", "inputStream");
            }

            resampler.MediaObject.SetInputWaveFormat(0, inputProvider.WaveFormat);
            if (!resampler.MediaObject.SupportsOutputWaveFormat(0, outputFormat))
            {
                throw new ArgumentException("Unsupported Output Stream format", "outputStream");
            }

            resampler.MediaObject.SetOutputWaveFormat(0, outputFormat);
            if (inputStream != null)
            {
                position = InputToOutputPosition(inputStream.Position);
            }
            this.inputMediaBuffer = new MediaBuffer(inputProvider.WaveFormat.AverageBytesPerSecond);
            this.outputBuffer = new DmoOutputDataBuffer(outputFormat.AverageBytesPerSecond);
        }

 public void LoadNextChunk(IWaveProvider source, int samplePairsRequired)
 {
     int sourceBytesRequired = samplePairsRequired;
     sourceBuffer = BufferHelpers.Ensure(sourceBuffer, sourceBytesRequired);
     sourceBytes = source.Read(sourceBuffer, 0, sourceBytesRequired);
     offset = 0;
 }

        /// <summary>
        /// Add a new input to the mixer
        /// </summary>
        /// <param name="waveProvider">The wave input to add</param>
        public void AddInputStream(IWaveProvider waveProvider)
        {
            if (waveProvider.WaveFormat.Encoding != WaveFormatEncoding.IeeeFloat)
                throw new ArgumentException("Must be IEEE floating point", "waveProvider.WaveFormat");
            if (waveProvider.WaveFormat.BitsPerSample != 32)
                throw new ArgumentException("Only 32 bit audio currently supported", "waveProvider.WaveFormat");

            if (inputs.Count == 0)
            {
                // first one - set the format
                int sampleRate = waveProvider.WaveFormat.SampleRate;
                int channels = waveProvider.WaveFormat.Channels;
                this.waveFormat = WaveFormat.CreateIeeeFloatWaveFormat(sampleRate, channels);
            }
            else
            {
                if (!waveProvider.WaveFormat.Equals(waveFormat))
                    throw new ArgumentException("All incoming channels must have the same format", "waveProvider.WaveFormat");
            }

            lock (inputs)
            {
                this.inputs.Add(waveProvider);
            }
        }

 /// <summary>
 /// Constructs a new MediaFoundationTransform wrapper
 /// Will read one second at a time
 /// </summary>
 /// <param name="sourceProvider">The source provider for input data to the transform</param>
 /// <param name="outputFormat">The desired output format</param>
 public MediaFoundationTransform(IWaveProvider sourceProvider, WaveFormat outputFormat)
 {
     this.outputWaveFormat = outputFormat;
     this.sourceProvider = sourceProvider;
     sourceBuffer = new byte[ComputeSourceBufferSize(sourceProvider)];
     outputBuffer = new byte[ComputeOutputBufferSize(outputFormat)]; // we will grow this buffer if needed, but try to make something big enough
 }

 /// <summary>
 /// Helper function to go from IWaveProvider to a SampleProvider
 /// Must already be PCM or IEEE float
 /// </summary>
 /// <param name="waveProvider">The WaveProvider to convert</param>
 /// <returns>A sample provider</returns>
 public static ISampleProvider ConvertWaveProviderIntoSampleProvider(IWaveProvider waveProvider)
 {
     ISampleProvider sampleProvider;
     if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.Pcm)
     {
         // go to float
         if (waveProvider.WaveFormat.BitsPerSample == 8)
         {
             sampleProvider = new Pcm8BitToSampleProvider(waveProvider);
         }
         else if (waveProvider.WaveFormat.BitsPerSample == 16)
         {
             sampleProvider = new Pcm16BitToSampleProvider(waveProvider);
         }
         else if (waveProvider.WaveFormat.BitsPerSample == 24)
         {
             sampleProvider = new Pcm24BitToSampleProvider(waveProvider);
         }
         else
         {
             throw new InvalidOperationException("Unsupported operation");
         }
     }
     else if (waveProvider.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
     {
         sampleProvider = new WaveToSampleProvider(waveProvider);
     }
     else
     {
         throw new ArgumentException("Unsupported source encoding");
     }
     return sampleProvider;
 }

 /// <summary>
 /// Remove an input from the mixer
 /// </summary>
 /// <param name="waveProvider">waveProvider to remove</param>
 public void RemoveInputStream(IWaveProvider waveProvider)
 {
     lock (inputs)
     {
         this.inputs.Remove(waveProvider);
     }
 }

            public AudioPlayer(IWaveProvider provider)
            {
                _playbackDevice.Init(provider);
                _playbackDevice.Play();

                _playbackDevice.PlaybackStopped += (sender, args) => Console.WriteLine("Playback stopped: " + args.Exception);
            }

        /// <summary>
        /// Initialises the WaveOut device
        /// </summary>
        /// <param name="waveProvider">WaveProvider to play</param>
        public void Init(IWaveProvider waveProvider)
        {
            if (playbackState != PlaybackState.Stopped)
            {
                throw new InvalidOperationException("Can't re-initialize during playback");
            }
            if (hWaveOut != IntPtr.Zero)
            {
                // normally we don't allow calling Init twice, but as experiment, see if we can clean up and go again
                // try to allow reuse of this waveOut device
                // n.b. risky if Playback thread has not exited
                DisposeBuffers();
                CloseWaveOut();
            }

            this.callbackEvent = new AutoResetEvent(false);

            this.waveStream = waveProvider;
            int bufferSize = waveProvider.WaveFormat.ConvertLatencyToByteSize((DesiredLatency + NumberOfBuffers - 1) / NumberOfBuffers);            

            MmResult result;
            lock (waveOutLock)
            {
                result = WaveInterop.waveOutOpenWindow(out hWaveOut, (IntPtr)DeviceNumber, waveStream.WaveFormat, callbackEvent.SafeWaitHandle.DangerousGetHandle(), IntPtr.Zero, WaveInterop.WaveInOutOpenFlags.CallbackEvent);
            }
            MmException.Try(result, "waveOutOpen");

            buffers = new WaveOutBuffer[NumberOfBuffers];
            playbackState = PlaybackState.Stopped;
            for (int n = 0; n < NumberOfBuffers; n++)
            {
                buffers[n] = new WaveOutBuffer(hWaveOut, bufferSize, waveStream, waveOutLock);
            }
        }

		/// <summary>
		/// Initialises the WaveOut device
		/// </summary>
		/// <param name="waveProvider">Wave provider to play</param>
		public void Init(IWaveProvider waveProvider)
		{
			if (Thread.CurrentThread.ManagedThreadId != waveOutThread.ManagedThreadId)
			{
				lock (actionQueue)
				{
					actionQueue.Enqueue(new WaveOutAction(WaveOutFunction.Init, waveStream));
					workAvailable.Set();
				}
				return;
			}

			waveStream = waveProvider;
			int bufferSize = waveProvider.WaveFormat.ConvertLatencyToByteSize(desiredLatency);
			//waveStream.GetReadSize((desiredLatency + 2) / 3);
			numBuffers = 3;

			MmException.Try(
				WaveInterop.waveOutOpen(out hWaveOut, (IntPtr) devNumber, waveStream.WaveFormat, callback, IntPtr.Zero,
				                        WaveInterop.CallbackFunction), "waveOutOpen");

			buffers = new WaveOutBuffer[numBuffers];
			playbackState = PlaybackState.Stopped;
			var waveOutLock = new object();
			for (int n = 0; n < numBuffers; n++)
			{
				buffers[n] = new WaveOutBuffer(hWaveOut, bufferSize, waveStream, waveOutLock);
			}
		}

 public Task Init(IWaveProvider waveProvider)
 {
     // do this still on the gui thread
     mediaElement.SetSource(new WaveProviderRandomAccessStream(waveProvider), "audio/wav");
     // must be a better way than this
     return new Task(() =>{});
 }

 /// <summary>
 /// Constructs a new MediaFoundationTransform wrapper
 /// Will read one second at a time
 /// </summary>
 /// <param name="sourceProvider">The source provider for input data to the transform</param>
 /// <param name="outputFormat">The desired output format</param>
 public MediaFoundationTransform(IWaveProvider sourceProvider, WaveFormat outputFormat)
 {
     this.outputWaveFormat = outputFormat;
     this.sourceProvider = sourceProvider;
     sourceBuffer = new byte[sourceProvider.WaveFormat.AverageBytesPerSecond];
     outputBuffer = new byte[outputWaveFormat.AverageBytesPerSecond + outputWaveFormat.BlockAlign]; // we will grow this buffer if needed, but try to make something big enough
 }

 public void LoadNextChunk(IWaveProvider source, int samplePairsRequired)
 {
     int sourceBytesRequired = samplePairsRequired * 6;
     sourceBuffer = GetSourceBuffer(sourceBytesRequired);
     sourceBytes = source.Read(sourceBuffer, 0, sourceBytesRequired);
     offset = 0;
 }

 public VolumeWaveProvider16(IWaveProvider sourceProvider)
 {
     this.sourceProvider = sourceProvider;
     if (sourceProvider.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
         throw new ArgumentException("Expecting PCM input");
     if (sourceProvider.WaveFormat.BitsPerSample != 16)
         throw new ArgumentException("Expecting 16 bit");
 }

 public SingleChannelMuxProvider(IWaveProvider sourceProvider, int channelNum, int totalChannels)
 {
     _source = sourceProvider;
     _channelNum = channelNum;
     _totalChannels = totalChannels;
     _bytesPerSample = sourceProvider.WaveFormat.BitsPerSample / 8;
     _finalFormat = new WaveFormat(sourceProvider.WaveFormat.SampleRate, sourceProvider.WaveFormat.BitsPerSample, totalChannels);
 }

 public void LoadNextChunk(IWaveProvider source, int samplePairsRequired)
 {
     int sourceBytesRequired = samplePairsRequired * 2;
     sourceSample = 0;
     sourceBuffer = BufferHelpers.Ensure(sourceBuffer, sourceBytesRequired);
     sourceWaveBuffer = new WaveBuffer(sourceBuffer);
     sourceSamples = source.Read(sourceBuffer, 0, sourceBytesRequired) / 2;
 }