private static bool FormatEnumCallback(IntPtr had, ref AcmInterop.ACMFORMATDETAILS pafd, UIntPtr dwInstance,
int fdwSupport)
{
if (pafd.cbwfx >= Marshal.SizeOf(typeof(MMInterop.WAVEFORMATEX)))
{
SoundFormat soundFormat = new SoundFormat(pafd.pwfx);
callbackFormats.Add(soundFormat);
}
return(true);
}
public static AcmConvertionMap GetConvertionMap(SoundFormat[] inputFormats, SoundFormatTag tagFilter)
{
// First, we enumerate convertion formats
AcmConvertionMap initConvertionMap = new AcmConvertionMap();
int maxFormatSize = GetMaxFormatSize();
// Enumerate acm drivers
foreach (int driverId in GetDriverIds())
{
// Open driver
IntPtr phDriver;
int mmr = AcmInterop.acmDriverOpen(out phDriver, driverId, 0);
if (mmr != 0)
{
continue;
}
// For each input format, we do enumeration
foreach (SoundFormat inputFormat in inputFormats)
{
// Fill format details struct
AcmInterop.ACMFORMATDETAILS fmtDetails = new AcmInterop.ACMFORMATDETAILS();
IntPtr pwfxFormat = inputFormat.ToPtr(maxFormatSize);
fmtDetails.cbStruct = Marshal.SizeOf(fmtDetails);
fmtDetails.pwfx = pwfxFormat;
fmtDetails.cbwfx = maxFormatSize;
// Enumerate convertion formats
callbackFormats = new List <SoundFormat>();
IntPtr pwfxInput = inputFormat.ToPtr();
mmr = AcmInterop.acmFormatEnum(phDriver, ref fmtDetails, FormatEnumCallback, IntPtr.Zero,
AcmInterop.ACM_FORMATENUMF_CONVERT);
Marshal.FreeHGlobal(pwfxInput);
// Add formats to the map (if succeed)
if (mmr == 0)
{
initConvertionMap.Add(inputFormat, callbackFormats);
}
callbackFormats = null;
}
// Close driver
mmr = AcmInterop.acmDriverClose(phDriver, 0);
}
// Now we query ACM to make sure each convertion is supported
AcmConvertionMap finalConvertionMap = new AcmConvertionMap();
SoundFormat[] inputs = initConvertionMap.GetInputs();
foreach (SoundFormat inputFormat in inputs)
{
IntPtr pwfxSrc = inputFormat.ToPtr();
foreach (SoundFormat outputFormat in initConvertionMap.GetOutputs(inputFormat))
{
// Filter tags
if (tagFilter != SoundFormatTag.UNKNOWN && outputFormat.Tag != tagFilter)
{
continue;
}
IntPtr phs;
IntPtr pwfxDst = outputFormat.ToPtr();
// Open acm stream using the query flag
int mmr = AcmInterop.acmStreamOpen(out phs, IntPtr.Zero, pwfxSrc, pwfxDst, IntPtr.Zero, IntPtr.Zero,
UIntPtr.Zero, AcmInterop.ACM_STREAMOPENF_QUERY);
Marshal.FreeHGlobal(pwfxDst);
// Add format to the final map if succeed
if (mmr == 0)
{
finalConvertionMap.Add(inputFormat, outputFormat);
}
}
Marshal.FreeHGlobal(pwfxSrc);
}
return(finalConvertionMap);
}
public static AcmConvertionMap GetConvertionMap(SoundFormat[] inputFormats, SoundFormatTag tagFilter)
{
// First, we enumerate convertion formats
AcmConvertionMap initConvertionMap = new AcmConvertionMap();
int maxFormatSize = GetMaxFormatSize();
// Enumerate acm drivers
foreach (int driverId in GetDriverIds()) {
// Open driver
IntPtr phDriver;
int mmr = AcmInterop.acmDriverOpen(out phDriver, driverId, 0);
if (mmr != 0) {
continue;
}
// For each input format, we do enumeration
foreach (SoundFormat inputFormat in inputFormats) {
// Fill format details struct
AcmInterop.ACMFORMATDETAILS fmtDetails = new AcmInterop.ACMFORMATDETAILS();
IntPtr pwfxFormat = inputFormat.ToPtr(maxFormatSize);
fmtDetails.cbStruct = Marshal.SizeOf(fmtDetails);
fmtDetails.pwfx = pwfxFormat;
fmtDetails.cbwfx = maxFormatSize;
// Enumerate convertion formats
callbackFormats = new List<SoundFormat>();
IntPtr pwfxInput = inputFormat.ToPtr();
mmr = AcmInterop.acmFormatEnum(phDriver, ref fmtDetails, FormatEnumCallback, IntPtr.Zero,
AcmInterop.ACM_FORMATENUMF_CONVERT);
Marshal.FreeHGlobal(pwfxInput);
// Add formats to the map (if succeed)
if (mmr == 0) {
initConvertionMap.Add(inputFormat, callbackFormats);
}
callbackFormats = null;
}
// Close driver
mmr = AcmInterop.acmDriverClose(phDriver, 0);
}
// Now we query ACM to make sure each convertion is supported
AcmConvertionMap finalConvertionMap = new AcmConvertionMap();
SoundFormat[] inputs = initConvertionMap.GetInputs();
foreach (SoundFormat inputFormat in inputs) {
IntPtr pwfxSrc = inputFormat.ToPtr();
foreach (SoundFormat outputFormat in initConvertionMap.GetOutputs(inputFormat)) {
// Filter tags
if (tagFilter != SoundFormatTag.UNKNOWN && outputFormat.Tag != tagFilter) {
continue;
}
IntPtr phs;
IntPtr pwfxDst = outputFormat.ToPtr();
// Open acm stream using the query flag
int mmr = AcmInterop.acmStreamOpen(out phs, IntPtr.Zero, pwfxSrc, pwfxDst, IntPtr.Zero, IntPtr.Zero,
UIntPtr.Zero, AcmInterop.ACM_STREAMOPENF_QUERY);
Marshal.FreeHGlobal(pwfxDst);
// Add format to the final map if succeed
if (mmr == 0) {
finalConvertionMap.Add(inputFormat, outputFormat);
}
}
Marshal.FreeHGlobal(pwfxSrc);
}
return finalConvertionMap;
}
