[wdmaudiodev] Re: Exposing more than 8 channels on Windows 7
- From: Neetu Sand <neetu.freelist@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Mon, 23 Jan 2012 22:58:54 +0530
Thanks Matthew for your help. I got solution to my problem. It was related
to the fact that I was exposing my device as a "Speaker". When a device is
exposed as a speaker, speaker configuration allows user to use only 8
channels. Now I am exposing my device as a "Line connector".
cheers,
Neetu
On Mon, Jan 9, 2012 at 9:47 PM, Matthew van Eerde <
Matthew.van.Eerde@xxxxxxxxxxxxx> wrote:
> pWaveFormatEx->wFormatTag = WAVE_FORMAT_EXTENSIBLE;****
>
> pWaveFormatEx->cbSize = 0;****
>
> ** **
>
> You’re setting the wFormatTag to WAVE_FORMAT_EXTENSIBLE. This means you
> need to fill out a WAVEFORMATEXTENSIBLE structure, not a WAVEFORMATEX. Set
> cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX) and fill in
> the additional data on the end.****
>
> ** **
>
> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:
> wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Neetu Sand
> *Sent:* Monday, January 09, 2012 6:04 AM
> *To:* wdmaudiodev@xxxxxxxxxxxxx
> *Subject:* [wdmaudiodev] Re: Exposing more than 8 channels on Windows 7***
> *
>
> ** **
>
> 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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