/// <summary> /// Converts a WMA file to a WAV stream /// </summary> /// <param name="outputStream">Stream to store the converted wav.</param> /// <param name="filePath">Path to a .wma file to convert</param> /// <returns>The WaveFormat object of the converted wav</returns> private static WaveFormat wmaToWav(string pathToWma, Stream outputStream, int sampleRate, int bitDepth, int numChannels) { if (!Path.GetExtension(pathToWma).ToLowerInvariant().Contains("wma")) throw new ArgumentException("Must be a .wma file!"); using (var reader = new WMAFileReader(pathToWma)) { var targetFormat = new NAudio.Wave.WaveFormat(sampleRate, bitDepth, numChannels); var pcmStream = new WaveFormatConversionStream(targetFormat, reader); var buffer = new byte[pcmStream.Length]; pcmStream.Read(buffer, 0, (int)pcmStream.Length); outputStream.Write(buffer, 0, buffer.Length); outputStream.Position = 0; pcmStream.Close(); return targetFormat; } }
/// <summary> /// Creates an input WaveChannel /// (Audio file reader for MP3/WAV/OGG/FLAC/WMA/AIFF/Other formats in the future) /// </summary> /// <param name="filename"></param> public static WaveStream CreateInputWaveChannel(string filename) { WaveStream m_blockAlignedStream = null; WaveStream m_waveReader = null; WaveChannel32 m_waveChannel = null; string fileExt = Path.GetExtension( filename.ToLower() ); if ( fileExt == MP3Extension ) { m_waveReader = new Mp3FileReader(filename); m_blockAlignedStream = new BlockAlignReductionStream(m_waveReader); // Wave channel - reads from file and returns raw wave blocks m_waveChannel = new WaveChannel32(m_blockAlignedStream); } else if ( fileExt == WAVExtension ) { m_waveReader = new WaveFileReader(filename); if (m_waveReader.WaveFormat.Encoding != WaveFormatEncoding.Pcm) { m_waveReader = WaveFormatConversionStream.CreatePcmStream(m_waveReader); m_waveReader = new BlockAlignReductionStream(m_waveReader); } if (m_waveReader.WaveFormat.BitsPerSample != 16) { var format = new WaveFormat(m_waveReader.WaveFormat.SampleRate, 16, m_waveReader.WaveFormat.Channels); m_waveReader = new WaveFormatConversionStream(format, m_waveReader); } m_waveChannel = new WaveChannel32(m_waveReader); } else if (fileExt == OGGVExtension) { m_waveReader = new OggFileReader(filename); if (m_waveReader.WaveFormat.Encoding != WaveFormatEncoding.Pcm) { m_waveReader = WaveFormatConversionStream.CreatePcmStream(m_waveReader); m_waveReader = new BlockAlignReductionStream(m_waveReader); } if (m_waveReader.WaveFormat.BitsPerSample != 16) { var format = new WaveFormat(m_waveReader.WaveFormat.SampleRate, 16, m_waveReader.WaveFormat.Channels); m_waveReader = new WaveFormatConversionStream(format, m_waveReader); } m_waveChannel = new WaveChannel32(m_waveReader); } else if (fileExt == FLACExtension) { m_waveReader = new FLACFileReader(filename); if (m_waveReader.WaveFormat.Encoding != WaveFormatEncoding.Pcm) { m_waveReader = WaveFormatConversionStream.CreatePcmStream(m_waveReader); m_waveReader = new BlockAlignReductionStream(m_waveReader); } if (m_waveReader.WaveFormat.BitsPerSample != 16) { var format = new WaveFormat(m_waveReader.WaveFormat.SampleRate, 16, m_waveReader.WaveFormat.Channels); m_waveReader = new WaveFormatConversionStream(format, m_waveReader); } m_waveChannel = new WaveChannel32(m_waveReader); } else if (fileExt == WMAExtension) { m_waveReader = new WMAFileReader(filename); if (m_waveReader.WaveFormat.Encoding != WaveFormatEncoding.Pcm) { m_waveReader = WaveFormatConversionStream.CreatePcmStream(m_waveReader); m_waveReader = new BlockAlignReductionStream(m_waveReader); } if (m_waveReader.WaveFormat.BitsPerSample != 16) { var format = new WaveFormat(m_waveReader.WaveFormat.SampleRate, 16, m_waveReader.WaveFormat.Channels); m_waveReader = new WaveFormatConversionStream(format, m_waveReader); } m_waveChannel = new WaveChannel32(m_waveReader); } else if (fileExt == AIFFExtension) { m_waveReader = new AiffFileReader(filename); m_waveChannel = new WaveChannel32(m_waveReader); } else { throw new ApplicationException("Cannot create Input WaveChannel - Unknown file type: " + fileExt); } //return m_waveReader; return m_waveChannel; }