[wdmaudiodev] Re: Does MSVAD support only 1 Microphone/Output Stream
- From: Vipin Kumar <vipin@xxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 13 Feb 2009 10:32:19 +0530
Hi,
Thanks for your reply.
I would like someone from MS( or anyone else) to clarify the stuff.
However, i need to modify MAX_OUTPUT_STREAMS . Lets say a user is using 2
Sound recorder instances, my driver ( based on MSVAD Simple) has the ability
to supply both of of them with completely different data ( though they have
selected my sound device) at the same time.
However, if MAX_OUTPUT_STREAMS = 1 , i don't get the
CMiniportWaveCyclic::NewStream call because kmixer knows that i support
only a single stream, so it will supply cached data ( which is same to both
the Sound recorder instances)
However, if MAX_OUTPUT_STREAMS > 1, then i get
CMiniportWaveCyclic::NewStream calls and then i can return 2 different
streams to different applications.
Everything works except if i change MAX_OUTPUT_STREAMS > 1 , then the
kmixer asks me for 660 or 662 bytes of data, but i amonly supposed to give
441 bytes of data( based on 22050 Hz, 16 bit mono).
Also, i couldn't understand "Your "Directsound:MSVAD Wave" will support
the multiple streams with the help of kmixer. " , if i understand it right,
then kmixer will supply cached data instead of making a new stream. Please
clarify.
yes, it's crystal clear in 1-to-1 case. Since i am feeding data from a
usermode application.
Waiting for your reply
Thanks
On Thu, Feb 12, 2009 at 6:35 PM, swapnil kamble <swap.kamble@xxxxxxxxx>wrote:
> Hi,
> There is no need to modify MAX_OUTPUT_STREAMS. Keep it to one. Your
> "Directsound:MSVAD Wave" will support the multiple streams with the help of
> kmixer. So ultimately one stream only but surely will serve your purpose. I
> want to know the quality of audio that you are getting. Is it crystal clear
> for one to one case ?
>
>
>
> On Thu, Feb 12, 2009 at 6:12 PM, Vipin Kumar <vipin@xxxxxxxxxxxxxx> wrote:
>
>> Hi,
>> i am using MSVAD simple as my base for supporting 20 virtual
>> microphone streams ( however, only 1 device is there, different streams are
>> given different data based on session ID).
>>
>> However, the moment i change MAX_OUTPUT_STREAMS in SIMPLE.H from
>> it's default value 1 to say 2 or 3, everything starts getting garbled,
>>
>>
>> the request CMiniportWaveCyclicStreamMSVAD::CopyFrom which triggers at
>> 10 ms means 22050 Hz, 16 bit mono , equals 441 bytes per 10 ms ( when
>> MAX_OUTPUT_STREAMS = 1)
>>
>>
>> becomes 660 bytes and sometimes 662 bytes, ( when MAX_OUTPUT_STREAMS
>> is greater than 1)
>>
>>
>> my only question is,
>> (i) What am i doing wrong.( i have confirmed my results 5 times in
>> a row, by interchanging the MAX_OUTPUT_STREAMS to 4 and vice versa ) &
>> everytime i got the same results.
>> (ii) How to do it ( support multiple capture streams);
>>
>>
>> here's 1 windbg log with MAX_OUTPUT_STREAMS set to 4
>>
>> MSVAD: New Format: 22050
>> CMiniportWaveCyclic::NewStream Stream
>> Timer Interval 10 Frame Size 441
>> MSVAD: KSSTATE_PAUSE
>> MSVAD: KSSTATE_RUN
>> 660
>> 662
>> 660
>> 662
>> 660
>> 662
>> 660
>> 662
>> 660
>> 662
>> 660
>>
>> Let me know your ideas/ solution
>>
>> Thanks.
>>
>> Regards.
>> Vipin
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> ...Swapnil
>
> || Hare Krishna Hare Krishna Krishna Krishna Hare Hare ||
> || Hare Rama Hare Rama Rama Rama Hare Hare ||
>
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