/// <summary>
/// Read the WaveFormatEx from the input file and find the place to start
/// writing data.
/// </summary>
private void LoadWFE()
{
MMCKINFO mmckinfoParentIn = new MMCKINFO();
MMCKINFO mmckinfoSubchunkIn = new MMCKINFO();
int mm = MMIO.Seek(m_OutputFile, 0, MMIOSeekFlags.Set);
if (mm < 0)
{
throw new Exception("seek failure");
}
// Check if this is a wave file
mmckinfoParentIn.fccType = new FourCC("WAVE");
MMIOError rc = MMIO.Descend(m_OutputFile, mmckinfoParentIn, null, RiffChunkFlags.FindRiff);
MMIO.ThrowExceptionForError(rc);
// Get format info
mmckinfoSubchunkIn.ckid = new FourCC("fmt ");
rc = MMIO.Descend(m_OutputFile, mmckinfoSubchunkIn, mmckinfoParentIn, RiffChunkFlags.FindChunk);
MMIO.ThrowExceptionForError(rc);
// Read the data format from the file (WaveFormatEx)
IntPtr ip = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(WaveFormatEx)));
try
{
rc = MMIO.Read(m_OutputFile, ip, mmckinfoSubchunkIn.ckSize);
if (rc < 0)
{
throw new Exception("Read failed");
}
m_wfe = new WaveFormatEx();
Marshal.PtrToStructure(ip, m_wfe);
}
finally
{
Marshal.FreeCoTaskMem(ip);
}
rc = MMIO.Ascend(m_OutputFile, mmckinfoSubchunkIn, 0);
MMIO.ThrowExceptionForError(rc);
// Find the data subchunk
mmckinfoSubchunkIn.ckid = new FourCC("data");
rc = MMIO.Descend(m_OutputFile, mmckinfoSubchunkIn, mmckinfoParentIn, RiffChunkFlags.FindChunk);
MMIO.ThrowExceptionForError(rc);
// Here is where data gets written
m_DataOffset = MMIO.Seek(m_OutputFile, 0, MMIOSeekFlags.Cur);
// Get the length of the audio
m_AudioLength = mmckinfoSubchunkIn.ckSize;
}
/// <summary>
/// Re-write the header, updating sizes
/// </summary>
private void WriteHeader()
{
int rc = MMIO.Seek(m_OutputFile, 0, MMIOSeekFlags.Set);
if (rc < 0)
{
throw new Exception("seek failure");
}
WriteWaveHeader();
WriteFormatBlock();
WriteDataBlock();
}
/// <summary>
/// Start (or resume) recording. Note that the file must be opened first.
/// </summary>
public void Record()
{
if (!m_Disposed)
{
MMIO.Seek(m_OutputFile, 0, MMIOSeekFlags.End);
int mmr = waveIn.Start(m_hDevice);
waveIn.ThrowExceptionForError(mmr);
}
else
{
throw new Exception("Instance is Disposed");
}
}
public void DoTests()
{
MMIOINFO mminfo = new MMIOINFO();
MMIOINFO mminfo2 = new MMIOINFO();
IntPtr ipOutput;
ipOutput = MMIO.Open(sFilename, mminfo, MMIOFlags.ReadWrite);
int i = MMIO.Seek(ipOutput, 0, MMIOSeekFlags.Set);
Debug.Assert(i >= 0);
MMIOError mm = MMIO.Flush(ipOutput, MMIOFlushFlags.None);
MMIO.ThrowExceptionForError(mm);
mm = MMIO.GetInfo(ipOutput, mminfo, Marshal.SizeOf(typeof(MMIOINFO)));
MMIO.ThrowExceptionForError(mm);
Debug.Assert(mminfo.dwFlags == MMIOFlags.ReadWrite);
mm = MMIO.SetInfo(ipOutput, mminfo, Marshal.SizeOf(typeof(MMIOINFO)));
MMIO.ThrowExceptionForError(mm);
IntPtr ipbuff = Marshal.AllocCoTaskMem(BUFSIZE);
mm = MMIO.SetBuffer(ipOutput, ipbuff, BUFSIZE, 0);
MMIO.ThrowExceptionForError(mm);
mm = MMIO.GetInfo(ipOutput, mminfo2, Marshal.SizeOf(typeof(MMIOINFO)));
MMIO.ThrowExceptionForError(mm);
mm = MMIO.Advance(ipOutput, mminfo2, RWMode.Read);
MMIO.ThrowExceptionForError(mm);
Debug.Assert(mminfo2.lDiskOffset == BUFSIZE);
mm = MMIO.Close(ipOutput, MMIOCloseFlags.None);
MMIO.ThrowExceptionForError(mm);
mm = MMIO.Rename(sFilename, sFilename2, null, 0);
MMIO.ThrowExceptionForError(mm);
mm = MMIO.Rename(sFilename2, sFilename, null, 0);
MMIO.ThrowExceptionForError(mm);
}
