[wdmaudiodev] AW: Re: DirectKS Problem on some machines
- From: "Patrick Pfeifer" <patrick_pfeifer@xxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 15 Feb 2005 14:26:49 +0100
Already tried. No result. --> "Error: No pins available for capturing. hr =
0x00000000"
Why is that? Capture Filters are found beforehand. Rendering instantiates
correctly, too.
-----Ursprüngliche Nachricht-----
Von: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] Im Auftrag von Jerry Evans
Gesendet: Dienstag, 15. Februar 2005 13:24
An: wdmaudiodev@xxxxxxxxxxxxx
Betreff: [wdmaudiodev] Re: DirectKS Problem on some machines
Have you tried opening them in stereo ? My AC97 and Creative hardware fails
in mono mode.
wfx.Format.nChannels = 2;
wfx.dwChannelMask = 0;
----- Original Message -----
From: "Patrick Pfeifer" <patrick_pfeifer@xxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Tuesday, February 15, 2005 11:56 AM
Subject: [wdmaudiodev] DirectKS Problem on some machines
Hello!
I implemented a low latency audio I/O streaming using the DirectKS sources.
Finally on some machines (with old soundcards, as well as on PC's with new
hardware, so I don't think it is a driver problem) that have a
wdm-audio-driver, I can't get any capture pins (finding appropriate pins for
rendering instead is no problem), although capturing filters have been
found. Why can't I get these capture pins in this simple format (see below)
if appropriate capturing filters are indeed available?
Help would be greatly appreciated.
Thank you!
As I said, on some machines, this works perfectly well and capable capture
pins are found without problems:
...
GUID aguidEnumCats[] = { STATIC_KSCATEGORY_AUDIO ,
STATIC_KSCATEGORY_CAPTURE};
hr =
pEnumerator->EnumFilters
(
eAudCap, // create audio capture filters ...
aguidEnumCats, // ... of these categories
2, // There are 2 categories
TRUE, // While you're at it, enumerate the pins
FALSE, // ... but don't bother with nodes
TRUE // Instantiate the filters
);
ThrowOnFail(hr, "CKsEnumFilters::EnumFilters failed");
bool failed=1;
while(failed && !pEnumerator->m_listFilters.IsEmpty())
{
failed=0;
pEnumerator->m_listFilters.GetHead((CKsFilter**)&_pFilter);
ThrowOnNull(_pFilter, "No filters available for capturing");
// instantiate the pin as 16bit, 48KHz, stereo
// use WAVEFORMATEXTENSIBLE to describe wave format
WAVEFORMATEXTENSIBLE wfx;
wfx.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
wfx.Format.nChannels = 1;
wfx.Format.nSamplesPerSec = 44100;
wfx.Format.nBlockAlign = 2;
wfx.Format.nAvgBytesPerSec = wfx.Format.nSamplesPerSec *
wfx.Format.nBlockAlign;
wfx.Format.wBitsPerSample = 16;
wfx.Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE)-
sizeof(WAVEFORMATEX);
wfx.Samples.wValidBitsPerSample = 16;
wfx.dwChannelMask = KSAUDIO_SPEAKER_MONO;
wfx.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
_pPin = _pFilter->CreateCapturePin(&wfx.Format, TRUE);
if (!_pPin)
_pPin = _pFilter->CreateCapturePin(&wfx.Format,
FALSE);
if (!_pPin)
{
// driver can't handle WAVEFORMATEXTENSIBLE, so fall
back // to WAVEFORMATEX format descriptor and try again
wfx.Format.wFormatTag = WAVE_FORMAT_PCM;
// set unused members to zero
wfx.Format.cbSize = 0;
wfx.Samples.wValidBitsPerSample = 0;
wfx.dwChannelMask = 0;
wfx.SubFormat = GUID_NULL;
_pPin = _pFilter->CreateCapturePin(&wfx.Format,
TRUE);
if (!_pPin)
_pPin = _pFilter->CreateCapturePin(&wfx.Format, FALSE);
}
if (_pPin==NULL)
{
pEnumerator-
>m_listFilters.RemoveHead((CKsFilter**)&_pFilter);
failed=1;
}
}
ThrowOnNull(_pPin, "No pins available for capturing");
if (_pPin!=NULL)
cout << "Capturing filter and pin found. " << endl;
...
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