Re: Volume per voices [Feature Request]

[Raymond <rayau@netvigator.com>]

Takashi Iwai wrote:
> At Mon, 01 Aug 2005 00:37:26 +0800,
> Raymond wrote:
> 
>>Jaroslav Kysela wrote:
>>
>>>On Thu, 28 Jul 2005, Raymond wrote:
>>>
>>>
>>>
>>>>In theory, and sound cards with hardware mixing can support this kind of
>>>>volume control.
>>>>
>>>
>>>Nope. Please, define the controls at the driver initialization phase and 
>>>make them inactive when the stream is not open. See emu10k1 or trident 
>>>driver for hints. You must also map the voice volume with substream 
>>>number.
>>>
>>
>>Beside volume control, Is it feasible to bind other controls (e.g.
>>Interaural Time Difference, Interaural Level Difference and SAMPLE RATE 
>>CONVERTOR - Doppler Effect ) to the substream ?
> 
> 
> I think yes.  Whatever directly bound to a PCM substream should be
> handled as IFACE_PCM with a certain subdevice number.
> 
> 

It's OK for au88x0 to use a sample rate different from that of PCM 
stream play the PCM stream to produce a different pitch.

Does the alsa-lib really allow using a kcontrol to change the sample 
rate while playing the PCM to produce the Doppler Effect ?











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