private void FillWave(WaveFormatEx w1, short iOffset)
{
w1.nBlockAlign = (short)(iOffset + 3);
w1.nAvgBytesPerSec = (short)(iOffset + 4);
w1.nChannels = (short)(iOffset + 5);
w1.nSamplesPerSec = (short)(iOffset + 6);
w1.wBitsPerSample = (short)(iOffset + 7);
w1.wFormatTag = (short)(iOffset + 8);
}
//-------------------------------------------------------------------
// Name: ValidateWaveFormat
// Description: Validates a WAVEFORMATEX structure.
//
// Just to keep the sample as simple as possible, we only accept
// uncompressed PCM formats.
//-------------------------------------------------------------------
void ValidateWaveFormat(WaveFormatEx pWav, int cbSize)
{
if (pWav.wFormatTag != 1)
{
throw new COMException("wFormatTag", MFError.MF_E_INVALIDMEDIATYPE);
}
if (pWav.nChannels != 1 && pWav.nChannels != 2)
{
throw new COMException("nChannels", MFError.MF_E_INVALIDMEDIATYPE);
}
if (pWav.wBitsPerSample != 8 && pWav.wBitsPerSample != 16)
{
throw new COMException("wBitsPerSample", MFError.MF_E_INVALIDMEDIATYPE);
}
if (pWav.cbSize != 0)
{
throw new COMException("cbSize", MFError.MF_E_INVALIDMEDIATYPE);
}
// Make sure block alignment was calculated correctly.
if (pWav.nBlockAlign != pWav.nChannels * (pWav.wBitsPerSample / 8))
{
throw new COMException("nBlockAlign", MFError.MF_E_INVALIDMEDIATYPE);
}
// Make sure average bytes per second was calculated correctly.
if (pWav.nAvgBytesPerSec != pWav.nSamplesPerSec * pWav.nBlockAlign)
{
throw new COMException("nAvgBytesPerSec", MFError.MF_E_INVALIDMEDIATYPE);
}
// Everything checked out.
}
void InitializePCMWaveFormat(out WaveFormatEx pWav, PCM_Audio_Format_Params param)
{
pWav = new WaveFormatEx();
pWav.wFormatTag = 1;
pWav.cbSize = 0;
pWav.nChannels = param.nChannels;
pWav.nSamplesPerSec = param.nSamplesPerSec;
pWav.wBitsPerSample = param.wBitsPerSample;
// Derived values
pWav.nBlockAlign = (short)(pWav.nChannels * (pWav.wBitsPerSample / 8));
pWav.nAvgBytesPerSec = pWav.nSamplesPerSec * pWav.nBlockAlign;
}
private void TestEqual()
{
WaveFormatEx a1 = new WaveFormatEx();
WaveFormatEx a2 = new WaveFormatEx();
WaveFormatEx a3 = new WaveFormatEx();
WaveFormatEx a4 = null;
WaveFormatExWithData b1 = new WaveFormatExWithData();
WaveFormatExWithData b2 = new WaveFormatExWithData();
WaveFormatExWithData b3 = new WaveFormatExWithData();
WaveFormatEx b4 = null;
WaveFormatExtensible c1 = new WaveFormatExtensible();
WaveFormatExtensible c2 = new WaveFormatExtensible();
WaveFormatExtensible c3 = new WaveFormatExtensible();
WaveFormatEx c4 = null;
WaveFormatExtensibleWithData d1 = new WaveFormatExtensibleWithData();
WaveFormatExtensibleWithData d2 = new WaveFormatExtensibleWithData();
WaveFormatExtensibleWithData d3 = new WaveFormatExtensibleWithData();
WaveFormatEx d4 = null;
FillWave(a1, 1);
FillWave(a2, 1);
FillWave(a3, 2);
FillWave(b1, 1);
FillWave(b2, 1);
FillWave(b3, 2);
FillWave(c1, 1);
FillWave(c2, 1);
FillWave(c3, 2);
FillWave(d1, 1);
FillWave(d2, 1);
FillWave(d3, 2);
b1.byteData = new byte[3];
b2.byteData = new byte[3];
d1.byteData = new byte[3];
d2.byteData = new byte[3];
FillByteData(b1.byteData, 2);
FillByteData(b2.byteData, 2);
FillByteData(d1.byteData, 2);
FillByteData(d2.byteData, 2);
Debug.Assert(!a1.Equals(null));
Debug.Assert(!a1.Equals(this));
Debug.Assert(a1.Equals(a1));
Debug.Assert(a1.Equals(a2));
Debug.Assert(!a1.Equals(a3));
Debug.Assert(!a1.Equals(a4));
Debug.Assert(a1 != null);
Debug.Assert(null != a1);
Debug.Assert(a1 == a2);
Debug.Assert(a2 == a1);
Debug.Assert(a1 != a3);
Debug.Assert(a3 != a1);
Debug.Assert(a4 != a1);
Debug.Assert(a1 != a4);
Debug.Assert(!b1.Equals(null));
Debug.Assert(!b1.Equals(this));
Debug.Assert(b1.Equals(b1));
Debug.Assert(b1.Equals(b2));
Debug.Assert(!b1.Equals(b3));
Debug.Assert(!b1.Equals(b4));
Debug.Assert(b1 != null);
Debug.Assert(null != b1);
Debug.Assert(b1 == b2);
Debug.Assert(b2 == b1);
Debug.Assert(b1 != b3);
Debug.Assert(b3 != b1);
Debug.Assert(b4 != b1);
Debug.Assert(b1 != b4);
Debug.Assert(!c1.Equals(null));
Debug.Assert(!c1.Equals(this));
Debug.Assert(c1.Equals(c1));
Debug.Assert(c1.Equals(c2));
Debug.Assert(!c1.Equals(c3));
Debug.Assert(!c1.Equals(c4));
Debug.Assert(c1 != null);
Debug.Assert(null != c1);
Debug.Assert(c1 == c2);
Debug.Assert(c2 == c1);
Debug.Assert(c1 != c3);
Debug.Assert(c3 != c1);
Debug.Assert(c4 != c1);
Debug.Assert(c1 != c4);
Debug.Assert(!d1.Equals(null));
Debug.Assert(!d1.Equals(this));
Debug.Assert(d1.Equals(d1));
Debug.Assert(d1.Equals(d2));
Debug.Assert(!d1.Equals(d3));
Debug.Assert(!d1.Equals(d4));
Debug.Assert(d1 != null);
Debug.Assert(null != d1);
Debug.Assert(d1 == d2);
Debug.Assert(d2 == d1);
Debug.Assert(d1 != d3);
Debug.Assert(d3 != d1);
Debug.Assert(d4 != d1);
Debug.Assert(d1 != d4);
Debug.Assert(!a1.Equals(b1));
Debug.Assert(!a1.Equals(c1));
Debug.Assert(!a1.Equals(d1));
Debug.Assert(!b1.Equals(a1));
Debug.Assert(!b1.Equals(c1));
Debug.Assert(!b1.Equals(d1));
Debug.Assert(!c1.Equals(a1));
Debug.Assert(!c1.Equals(b1));
Debug.Assert(!c1.Equals(d1));
Debug.Assert(!d1.Equals(a1));
Debug.Assert(!d1.Equals(b1));
Debug.Assert(!d1.Equals(c1));
Debug.Assert(a1 != b1);
Debug.Assert(a1 != c1);
Debug.Assert(a1 != d1);
Debug.Assert(b1 != a1);
Debug.Assert(b1 != c1);
Debug.Assert(b1 != d1);
Debug.Assert(c1 != a1);
Debug.Assert(c1 != b1);
Debug.Assert(c1 != d1);
Debug.Assert(d1 != a1);
Debug.Assert(d1 != b1);
Debug.Assert(d1 != c1);
}
private void TestWaveFormatEx()
{
WaveFormatEx w1 = new WaveFormatEx();
FillWave(w1, 0);
IntPtr ip = w1.GetPtr();
WaveFormatEx w2 = WaveFormatEx.PtrToWave(ip);
Marshal.FreeCoTaskMem(ip);
Debug.Assert(w1 == w2);
}
private void TestWaveFormatExPCM()
{
int iDataSize = 5;
WaveFormatEx w1 = new WaveFormatEx();
FillWave(w1, 0);
w1.cbSize = (short)(iDataSize);
w1.wFormatTag = 1;
IntPtr ip = w1.GetPtr();
WaveFormatEx w2 = WaveFormatEx.PtrToWave(ip) as WaveFormatEx;
Marshal.FreeCoTaskMem(ip);
// Equals won't work cuz of the cbSize issue
//Debug.Assert(w1 == w2);
}
public static WaveFormatEx PtrToWave(IntPtr pNativeData)
{
short wFormatTag = Marshal.ReadInt16(pNativeData);
WaveFormatEx wfe;
// WAVE_FORMAT_EXTENSIBLE == -2
if (wFormatTag != -2)
{
short cbSize;
// By spec, PCM has no cbSize element
if (wFormatTag != 1)
{
cbSize = Marshal.ReadInt16(pNativeData, 16);
}
else
{
cbSize = 0;
}
// Does the structure contain extra data?
if (cbSize == 0)
{
// Create a simple WaveFormatEx struct
wfe = new WaveFormatEx();
Marshal.PtrToStructure(pNativeData, wfe);
// It probably already has the right value, but there is a special case
// where it might not, so, just to be safe...
wfe.cbSize = 0;
}
else
{
WaveFormatExWithData dat = new WaveFormatExWithData();
// Manually parse the data into the structure
dat.wFormatTag = wFormatTag;
dat.nChannels = Marshal.ReadInt16(pNativeData, 2);
dat.nSamplesPerSec = Marshal.ReadInt32(pNativeData, 4);
dat.nAvgBytesPerSec = Marshal.ReadInt32(pNativeData, 8);
dat.nBlockAlign = Marshal.ReadInt16(pNativeData, 12);
dat.wBitsPerSample = Marshal.ReadInt16(pNativeData, 14);
dat.cbSize = cbSize;
dat.byteData = new byte[dat.cbSize];
IntPtr ip2 = new IntPtr(pNativeData.ToInt64() + 18);
Marshal.Copy(ip2, dat.byteData, 0, dat.cbSize);
wfe = dat as WaveFormatEx;
}
}
else
{
short cbSize;
int extrasize = Marshal.SizeOf(typeof(WaveFormatExtensible)) - Marshal.SizeOf(typeof(WaveFormatEx));
cbSize = Marshal.ReadInt16(pNativeData, 16);
if (cbSize == extrasize)
{
WaveFormatExtensible ext = new WaveFormatExtensible();
Marshal.PtrToStructure(pNativeData, ext);
wfe = ext as WaveFormatEx;
}
else
{
WaveFormatExtensibleWithData ext = new WaveFormatExtensibleWithData();
int iExtraBytes = cbSize - extrasize;
ext.wFormatTag = wFormatTag;
ext.nChannels = Marshal.ReadInt16(pNativeData, 2);
ext.nSamplesPerSec = Marshal.ReadInt32(pNativeData, 4);
ext.nAvgBytesPerSec = Marshal.ReadInt32(pNativeData, 8);
ext.nBlockAlign = Marshal.ReadInt16(pNativeData, 12);
ext.wBitsPerSample = Marshal.ReadInt16(pNativeData, 14);
ext.cbSize = cbSize;
ext.wValidBitsPerSample = Marshal.ReadInt16(pNativeData, 18);
ext.dwChannelMask = (WaveMask)Marshal.ReadInt16(pNativeData, 20);
// Read the Guid
byte[] byteGuid = new byte[16];
Marshal.Copy(new IntPtr(pNativeData.ToInt64() + 24), byteGuid, 0, 16);
ext.SubFormat = new Guid(byteGuid);
ext.byteData = new byte[iExtraBytes];
IntPtr ip2 = new IntPtr(pNativeData.ToInt64() + Marshal.SizeOf(typeof(WaveFormatExtensible)));
Marshal.Copy(ip2, ext.byteData, 0, iExtraBytes);
wfe = ext as WaveFormatEx;
}
}
return wfe;
}
private long BufferSizeFromAudioDuration(WaveFormatEx pWav, long duration)
{
long cbSize = duration * pWav.nAvgBytesPerSec / ONE_SECOND;
int ulRemainder = (int)(cbSize % pWav.nBlockAlign);
// Round up to the next block.
if (ulRemainder > 0)
{
cbSize += pWav.nBlockAlign - ulRemainder;
}
return cbSize;
}
public static long AudioDurationFromBufferSize(WaveFormatEx pWav, int cbAudioDataSize)
{
Debug.Assert(pWav != null);
if (pWav.nAvgBytesPerSec == 0)
{
return 0;
}
return Utils.MulDiv(cbAudioDataSize, 10000000, pWav.nAvgBytesPerSec);
}
//-------------------------------------------------------------------
// Name: ReadFormatBlock
// Description: Reads the WAVEFORMATEX structure from the file header.
//-------------------------------------------------------------------
private void ReadFormatBlock()
{
Debug.Assert(Chunk().FourCC() == new FourCC("fmt "));
Debug.Assert(m_pWaveFormat == null);
try
{
int iWaveFormatExSize = Marshal.SizeOf(typeof(WaveFormatEx));
// Some .wav files do not include the cbSize field of the WAVEFORMATEX
// structure. For uncompressed PCM audio, field is always zero.
int cbMinFormatSize = iWaveFormatExSize - Marshal.SizeOf(typeof(short));
int cbFormatSize = 0; // Size of the actual format block in the file.
// Validate the size
if (Chunk().DataSize() < cbMinFormatSize)
{
throw new COMException("chunk too small", MFError.MF_E_INVALID_FILE_FORMAT);
}
// Allocate a buffer for the WAVEFORMAT structure.
cbFormatSize = Chunk().DataSize();
// We store a WAVEFORMATEX structure, so our format block must be at
// least sizeof(WAVEFORMATEX) even if the format block in the file
// is smaller. See note above about cbMinFormatSize.
m_cbWaveFormat = Math.Max(cbFormatSize, iWaveFormatExSize);
IntPtr ip = Marshal.AllocCoTaskMem(m_cbWaveFormat);
try
{
// Zero our structure, in case cbFormatSize < m_cbWaveFormat.
for (int x = 0; x < m_cbWaveFormat; x++)
{
Marshal.WriteByte(ip, x, 0);
}
// Now read cbFormatSize bytes from the file.
ReadDataFromChunk(ip, cbFormatSize);
m_pWaveFormat = new WaveFormatEx();
Marshal.PtrToStructure(ip, m_pWaveFormat);
Debug.Assert(m_pWaveFormat.cbSize == 0);
}
finally
{
Marshal.FreeCoTaskMem(ip);
}
}
catch
{
m_pWaveFormat = null;
m_cbWaveFormat = 0;
throw;
}
}
/// <summary>
/// ValidateWaveFormat - Validates a WAVEFORMATEX structure.
/// </summary>
/// <remarks>
/// This method is called when the byte stream handler opens the
/// source. The WAVEFORMATEX structure is copied directly from the
/// .wav file. Therefore the source should not trust any of the
/// values in the format header.
///
/// Just to keep the sample as simple as possible, we only accept
/// uncompressed PCM formats in this media source.
/// </remarks>
/// <param name="pWav"></param>
/// <param name="cbSize"></param>
/// <returns></returns>
private void ValidateWaveFormat(WaveFormatEx pWav, int cbSize)
{
m_Log.WriteLine("ValidateWaveFormat");
if (pWav.wFormatTag != WAVE_FORMAT_PCM)
{
throw new COMException("bad wFormatTag", MFError.MF_E_INVALIDMEDIATYPE);
}
if (pWav.nChannels != 1 && pWav.nChannels != 2)
{
throw new COMException("bad # channels", MFError.MF_E_INVALIDMEDIATYPE);
}
if (pWav.wBitsPerSample != 8 && pWav.wBitsPerSample != 16)
{
throw new COMException("bad bitspersample", MFError.MF_E_INVALIDMEDIATYPE);
}
if (pWav.cbSize != 0)
{
throw new COMException("bad cbsize", MFError.MF_E_INVALIDMEDIATYPE);
}
// Make sure block alignment was calculated correctly.
if (pWav.nBlockAlign != pWav.nChannels * (pWav.wBitsPerSample / 8))
{
throw new COMException("bad align", MFError.MF_E_INVALIDMEDIATYPE);
}
// Check possible overflow...
if (pWav.nSamplesPerSec > (int)(int.MaxValue / pWav.nBlockAlign)) // Is (nSamplesPerSec * nBlockAlign > MAXDWORD) ?
{
throw new COMException("overflow", MFError.MF_E_INVALIDMEDIATYPE);
}
// Make sure average bytes per second was calculated correctly.
if (pWav.nAvgBytesPerSec != pWav.nSamplesPerSec * pWav.nBlockAlign)
{
throw new COMException("bad AvgBytesPerSec", MFError.MF_E_INVALIDMEDIATYPE);
}
}
