Is it possible that the Softvol plug in only supports S16_LE and S32_LE formats?
Cameron Barfield wrote:
> Well, I think I am actually on the right track.
>
> I'm using a Blackfin BF537 with an AD1980BL (AC97) codec. All seems well
> with it. I'm running it with MMAP and DMIX appears to work beautifully.
>
> I'm trying to add the volume controls to the mixer so that my
> application can adjust the volumes of its audio streams.
>
> I've been playing around with /etc/asound.conf and so far I have:
>
> pcm.mychan1 {
> type softvol
> slave.pcm "default"
> control.name "mychan1"
> control.card 0
> }
>
> I can play WAV files (48K) no problem using aplay -D mychan1 file.wav.
> If I play any wav/au files that need rate conversion, I get:
>
> aplay: set_params:904: Sample format non available
>
> If I don't specify a device for aplay, I can play pretty much any wav/au
> file I have. DMIX also still works.
>
> If I adjust the volume of my new channel, it does adjust independently
> of Master,0 and PCM,0
>
> Am I just grossly misunderstanding how asound.conf works?
>
>
>
> Cameron Barfield wrote:
>> Hi --
>>
>> I've got an application that receives multiple network audio streams.
>> Using DMIX, I am able to play back all the streams through my sound card.
>>
>> The problem is that I would like to be able to independently adjust
>> the volume of each audio stream. Would Softvol work for this? All the
>> examples I've found only show Softvol working as a replacement for a
>> master volume control (and that's all I've been able to get it to do).
>>
>> If Softvol won't work for independent volume controls, is there any
>> other ALSA plugin or API call that I'm missing? Switching to something
>> like Pulseaudio would probably not be an option since I'm running in
>> an embedded environment.
>>
>> Regards,
>> Cameron
>>
>>
>
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