// returns format id in style of WAVEFORMATEX wFormatTag, if it possible
bool FormatDetect(const WAVEFORMATEX* format, WORD* id)
{
if (format->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
{
const WAVEFORMATEXTENSIBLE *ext = (const WAVEFORMATEXTENSIBLE*)format;
if (IS_VALID_WAVEFORMATEX_GUID(&ext->SubFormat))
{
*id = EXTRACT_WAVEFORMATEX_ID(&ext->SubFormat);
return true;
}
return false;
}
*id = format->wFormatTag;
return true;
}
//=============================================================================
NTSTATUS
CMiniportWaveCyclic::ValidateFormat
(
IN ULONG nPin,
IN PKSDATAFORMAT pDataFormat
)
/*++
Routine Description:
Validates that the given dataformat is valid. This overwrites BaseWave's
ValidateFormat and includes checks for AC3 format.
Arguments:
pDataFormat - The dataformat for validation.
Return Value:
NT status code.
--*/
{
PAGED_CODE();
DPF_ENTER(("[CMiniportWaveCyclic::ValidateFormat]"));
NTSTATUS ntStatus = STATUS_INVALID_PARAMETER;
PWAVEFORMATEX pwfx;
pwfx = GetWaveFormatEx(pDataFormat);
if (pwfx)
{
if (IS_VALID_WAVEFORMATEX_GUID(&pDataFormat->SubFormat))
{
USHORT wfxID = EXTRACT_WAVEFORMATEX_ID(&pDataFormat->SubFormat);
if ((wfxID == WAVE_FORMAT_PCM) ||
((wfxID == WAVE_FORMAT_DOLBY_AC3_SPDIF) &&
((nPin == KSPIN_WAVE_SPDIF_CAPTURE_HOST) || (nPin == KSPIN_WAVE_SPDIF_RENDER_HOST))))
{
if
(
(pDataFormat->FormatSize == sizeof(KSDATAFORMAT_WAVEFORMATEX)) &&
(pwfx->cbSize == 0) &&
(pwfx->nChannels <= MAX_CHANNELS ) &&
(pwfx->wBitsPerSample >= MIN_BITS_PER_SAMPLE)&&
(pwfx->wBitsPerSample <= MAX_BITS_PER_SAMPLE)&&
(pwfx->nSamplesPerSec >= MIN_SAMPLE_RATE) &&
(pwfx->nSamplesPerSec <= MAX_SAMPLE_RATE)
)
{
ntStatus = STATUS_SUCCESS;
}
else
{
DPF(D_TERSE, ("Invalid format"));
}
}
else
{
DPF(D_TERSE, ("Invalid format tag"));
}
}
else
{
DPF(D_TERSE, ("Invalid pDataFormat->SubFormat!") );
}
}
return ntStatus;
} // ValidateFormat