public WaveWriter(Stream Output, WaveFormat Format)
: base(Output, Format)
{
if ( !OutStream.CanSeek )
{
throw new ArgumentException("The stream must supports seeking if AudioDataSize is not supported", "Output");
}
OutStream.Seek(WaveHeaderSize+8, SeekOrigin.Current);
}
public WaveInRecorder(int device, WaveFormat format, int bufferSize, int bufferCount, BufferDoneEventHandler doneProc)
{
m_DoneProc = doneProc;
WaveInHelper.Try(WaveNative.waveInOpen(out m_WaveIn, device, format, m_BufferProc, 0, WaveNative.CALLBACK_FUNCTION));
AllocateBuffers(bufferSize, bufferCount);
for (int i = 0; i < bufferCount; i++)
{
SelectNextBuffer();
m_CurrentBuffer.Record();
}
WaveInHelper.Try(WaveNative.waveInStart(m_WaveIn));
m_Thread = new Thread(new ThreadStart(ThreadProc));
m_Thread.Start();
}
public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
private void ReadHeader()
{
BinaryReader Reader = new BinaryReader(m_Stream);
if (ReadChunk(Reader) != "RIFF")
throw new Exception("Invalid file format");
Reader.ReadInt32(); // File length minus first 8 bytes of RIFF description, we don't use it
if (ReadChunk(Reader) != "WAVE")
throw new Exception("Invalid file format");
if (ReadChunk(Reader) != "fmt ")
throw new Exception("Invalid file format");
int FormatLength = Reader.ReadInt32();
if ( FormatLength < 16) // bad format chunk length
throw new Exception("Invalid file format");
m_Format = new WaveFormat(22050, 16, 2); // initialize to any format
m_Format.wFormatTag = Reader.ReadInt16();
m_Format.nChannels = Reader.ReadInt16();
m_Format.nSamplesPerSec = Reader.ReadInt32();
m_Format.nAvgBytesPerSec = Reader.ReadInt32();
m_Format.nBlockAlign = Reader.ReadInt16();
m_Format.wBitsPerSample = Reader.ReadInt16();
if ( FormatLength > 16)
{
m_Stream.Position += (FormatLength-16);
}
// assume the data chunk is aligned
while(m_Stream.Position < m_Stream.Length && ReadChunk(Reader) != "data")
;
if (m_Stream.Position >= m_Stream.Length)
throw new Exception("Invalid file format");
m_Length = Reader.ReadInt32();
m_DataPos = m_Stream.Position;
Position = 0;
}
public WaveWriter(Stream Output, WaveFormat Format, uint AudioDataSize)
: base(Output, Format)
{
m_AudioDataSize = AudioDataSize;
WriteWaveHeader();
}
public AudioWriter(Stream Output, WaveFormat InputDataFormat)
: base(Output, System.Text.Encoding.ASCII)
{
m_InputDataFormat = InputDataFormat;
}
