[wdmaudiodev] Re: Accumulated delay in MSVAD based virtual audio driver
- From: Anton Shpakovsky <anton.shpakovsky@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 28 Apr 2011 20:19:49 +0700
Christian,
All I do in CopyFrom is memcpy from my internal driver buffer with audio
data to the Destination pointer (requested in CopyFrom).
I've described the details in reply to Rob.
Thanks.
On Thu, Apr 28, 2011 at 1:52 PM, CS <siedschl@xxxxxx> wrote:
> Sounds like you are doing some computationally expensive things in
> CopyFrom... could that be the case?
>
> Christian
>
> Am 28.04.2011 05:58, schrieb Anton Shpakovsky:
>
>> Hi,
>>
>> I have the virtual microphone driver based on MSVAD. I have implemented
>> the CopyFrom function - the audio data is received from my client
>> application through my API.
>> I send pieces of audio data that are 50msec, 44100Hz, 16bit strereo sound
>> = 8800 bytes.
>>
>> When I set up the DMA_BUFFER_SIZE to 100 or even 200 msec, I still have
>> choppy audio. If I understood correctly, the DMA buffer cursors are being
>> updated too frequently.
>> I have increased the buffer size to 2 seconds (352800bytes) - and the
>> sound became smooth now. BUT I'm experiencing the annoying delay in signal.
>> I.e. after I'm using my mic during a minute, the sound delay equals 2
>> seconds and there is no way to fix it until I restart my application.
>>
>> This timing problem is driving me mad. Please, point me to the right
>> direction.
>>
>> Thanks a lot,
>> Anton.
>>
>
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