private void CreateReaderStream(Stream sourceStream, WaveStreamType waveStreamType)
{
switch (waveStreamType)
{
case WaveStreamType.Wav:
{
_readerStream = new WaveFileReader(sourceStream);
if (_readerStream.WaveFormat.Encoding == WaveFormatEncoding.Pcm ||
_readerStream.WaveFormat.Encoding == WaveFormatEncoding.IeeeFloat)
{
return;
}
_readerStream = WaveFormatConversionStream.CreatePcmStream(_readerStream);
_readerStream = new BlockAlignReductionStream(_readerStream);
break;
}
case WaveStreamType.Mp3:
_readerStream = new Mp3FileReader(sourceStream);
break;
case WaveStreamType.Ogg:
_readerStream = new VorbisWaveReader(sourceStream);
break;
case WaveStreamType.Aiff:
_readerStream = new AiffFileReader(sourceStream);
break;
default:
throw new NotSupportedException("Not support the specific stream type");
}
}
public MyAudioFileReader(Stream stream, WaveStreamType waveStreamType)
{
_lockObject = new object();
CreateReaderStream(stream, waveStreamType);
_sourceBytesPerSample = _readerStream.WaveFormat.BitsPerSample / 8 * _readerStream.WaveFormat.Channels;
_sampleChannel = new NAudio.Wave.SampleProviders.SampleChannel(_readerStream, false);
_destBytesPerSample = 4 * _sampleChannel.WaveFormat.Channels;
_length = SourceToDest(_readerStream.Length);
}
/// <summary>
/// 构造一个波形图绘制类的实例
/// </summary>
public WavePainter()
{
mPngWidth = Defines.PNG_WIDTH;
mPngHeight = Defines.PNG_HEIGHT;
mSrcPath = string.Empty;
mBitmapPath = string.Empty;
mBitmapPath1 = string.Empty;
mVolumnNum = 1;
mDrawBrush = Brushes.Green;
mSourceType = WaveStreamType.LocalFile;
mIsSaveFile = true;
}
/// <summary>
/// Initializes a new instance of AudioFileReader
/// </summary>
/// <param name="buffer">The stream to open</param>
/// <param name="waveStreamType">The type of source stream</param>
public MyAudioFileReader(byte[] buffer, WaveStreamType waveStreamType)
: this(new MemoryStream(buffer), waveStreamType)
{
}
