[wdmaudiodev] Re: Exposing more than 8 channels on Windows 7
- From: Neetu Sand <neetu.freelist@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Mon, 9 Jan 2012 19:33:35 +0530
Hi Matthew,
Yes, I am seeing Get request. I am returning the default format expected by
my driver. Code is as follows:
if (PropertyRequest->ValueSize == 0)
{
PropertyRequest->ValueSize = sizeof(KSDATAFORMAT_WAVEFORMATEX);
return STATUS_BUFFER_OVERFLOW;
}
else if (PropertyRequest->ValueSize <
sizeof(KSDATAFORMAT_WAVEFORMATEX))
{
return STATUS_BUFFER_TOO_SMALL;
}
PKSDATAFORMAT_WAVEFORMATEX pKsFormat =
(PKSDATAFORMAT_WAVEFORMATEX)PropertyRequest->Value;
PWAVEFORMATEX pWaveFormatEx;
pKsFormat->DataFormat.FormatSize = sizeof
(KSDATAFORMAT_WAVEFORMATEX);
pKsFormat->DataFormat.Flags = 0;
pKsFormat->DataFormat.Reserved = 0;
pKsFormat->DataFormat.MajorFormat = KSDATAFORMAT_TYPE_AUDIO;
pKsFormat->DataFormat.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
pKsFormat->DataFormat.Specifier =
KSDATAFORMAT_SPECIFIER_WAVEFORMATEX;
pWaveFormatEx =
(PWAVEFORMATEX)((PKSDATAFORMAT)PropertyRequest->Value + 1);
pWaveFormatEx->wFormatTag = WAVE_FORMAT_EXTENSIBLE;
pWaveFormatEx->nChannels = MAX_CHANNELS; //16
pWaveFormatEx->nSamplesPerSec = m_SampleRate; //could be in range
of 32kHz-192 kHz
pWaveFormatEx->wBitsPerSample = 16;
pWaveFormatEx->cbSize = 0;
pWaveFormatEx->nBlockAlign =
pWaveFormatEx->nChannels * pWaveFormatEx->wBitsPerSample / 8;
pWaveFormatEx->nAvgBytesPerSec =
pWaveFormatEx->nSamplesPerSec * pWaveFormatEx->nBlockAlign;
pKsFormat->DataFormat.SampleSize = pWaveFormatEx->nBlockAlign; //
must match nBlockAlign
PropertyRequest->ValueSize = sizeof(KSDATAFORMAT_WAVEFORMATEX);
ntStatus = STATUS_SUCCESS;
return ntStatus;
I receive get call twice. First time it gets the size of buffer and second
time it extracts the format. Then I get a set call but the set call is
never made with 16 channels which is returned in Get call. I return
STATUS_SUCCESS in set call for (channel <=16). Set is called with channel
count 2 and then called with channel count that is selected as speaker
configuration i.e. if I keep speaker configuration 7.1 then second set call
is made with channel count 8.
So I don't know how can I show format for 16 channels on advance tab of my
speaker device. Because the speaker configuration only shows up to 7.1 that
is 8 channels. Do I need to disable configure button for speaker? If yes
then how can I do that?
Please note that I do the same things for my recording device and it shows
format for channel 1-16 i.e. it works as expected on sample rates 32kHz -48
kHz. For higher sample rates, this does not work and Advance tab is not
shown.
cheers,
Neetu
O n Fri, Jan 6, 2012 at 9:42 PM, Matthew van Eerde <
Matthew.van.Eerde@xxxxxxxxxxxxx> wrote:
> Are you seeing a KSPROPERTY_TYPE_GET request? What are you returning?***
> *
>
> ** **
>
> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:
> wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Neetu Sand
> *Sent:* Friday, January 06, 2012 5:57 AM
> *To:* wdmaudiodev@xxxxxxxxxxxxx
> *Subject:* [wdmaudiodev] Exposing more than 8 channels on Windows 7****
>
> ** **
>
> Hi All,
>
> I have a query regarding publishing 16 channels on a speaker device. I
> specify channel count as 16 while specifying the datarange in pin factory.
> In handler for KSPROPERTY_PIN_PROPOSEDATAFORMAT, I handle condition for 16
> channels but the problem is that the handler for
> KSPROPERTY_PIN_PROPOSEDATAFORMAT is never called with 16 channels. It is
> called within the channel count range of 1-8. DataRangeIntersection is
> never called.
>
> Also I notice that for some devices "Advance" tab on Sound and Audio
> control panel shows "Channel, Bit Depth and Sample Rate" while for others,
> it just shows "Bit Depth and Sample rate". However for later case speaker
> configuration is enabled but for the earlier case "configure" button on
> Sound And audio control panel is disabled. What change in driver code leads
> to this behavior of Sound and Audio Control Panel? I tried removing
> KSPROPERTY_AUDIO_CHANNEL_CONFIG from my code but I still see "Configure"
> button enabled for my device.
>
> I am not sure what change in driver would let Sound and Audio CPL detect
> 16 channels for my device. Any help is appreciated.
>
> Cheers,
> Neetu****
>
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