[wdmaudiodev] Re: help with virtual audio driver.
- From: admin@xxxxxxxxxxxxxxxxx
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 12 May 2004 09:47:13 +0800 (CST)
Thanks jeff.
Your information is very useful for my decision.
Could you tell me how much I can do in a filer driver?
Can I intercept the audio data sent by dsound/waveout?
If more, can it intercept the data from microphone or line in?
Can such filter use in win98 as well?
Thanks
> I've done this, but it's not trivial. Essentially you need to use
> KsCreatePin to attach to the sound card's rendering pin, and then pass the
> audio data to it when you get an IOCTL_KS_WRITE_STREAM. If, as you said,
> you're a newbie to driver development (and, I assume, kernel streaming in
> particular), I really wouldn't recommend this approach because there are a
> LOT of non-trivial details. Would a filter driver for the already-existing
> audio driver work instead?
>
> Jeff
>
> -----Original Message-----
> From: admin@xxxxxxxxxxxxxxxxx [mailto:admin@xxxxxxxxxxxxxxxxx]
> Sent: Monday, May 10, 2004 7:45 PM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: help with virtual audio driver.
>
>
> Thanks for the reply.
>
> Actually
> I want to make it a virtual audio driver. It don't need a specific hardware.
> It uses the sound
> card to play or record. But it acts like a true audio device there. So apps
> that use it can work
> normally, but I can have control on the data stream in this driver now.
>
> I have looked at MSVAD driver in WINXP DDK. It writes the data to disk. I
> wonder how to send the
> data to another true sourd device at the same time.
>
>
>
>
>
>> If your driver is writing to the actual sound card, then how can you call
> that as virtual audio
>> driver
>> ? If you want a sample of real aduio driver then, micro soft provides ac97
> sources.
>>
>> -Esha
>>
>> admin@xxxxxxxxxxxxxxxxx wrote:
>>
>>> Hi, All:
>>>
>>> I am newbie in driver developing.
>>> I want to implement a virtual audio driver working under win9x and nt
> base system such as
>>> win2000,
>>> windows xp.
>>>
>>> 1. Can the msvad example in XP ddk be used in win9x? It seems to be a wdm
> driver.
>>>
>>> 2. The virtual driver need to be transparent, it will send the data to an
> actural sound card.
>>> How can I do this in the driver?
>>>
>>> Thanks
>>>
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>>
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>
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