Re: Mono to stereo ?

[Jeff Muizelaar <muizelaar@rogers.com>]

Takashi Iwai wrote:

>At Thu, 27 Mar 2003 23:14:22 -0400,
>Manuel Jander wrote:
>  
>
>>...but, if you are doing mono playback, your sound driver has to setup
>>your soundcard to playback on both channels the same mono channel. The 
>>Vortex
>>driver (still not in the main branch) for example splits the mono signal 
>>on its internal
>>mixer into 2 identical signals which are feed one into each CODEC channels.
>>    
>>
>
>no, please don't do that.
>in the ALSA, instead of the lowlevel driver, alsa-lib (and
>oss-emulation module) will do this job.
>
In this case the card (not driver) is spliting the mono signal and 
sending it to both right and left channels of the codec. Thus 
channels_min should still be 1 because the card does actually support a 
single channel

>the driver is supposed to inform exactly what it supports.
>in this case, both channels_min and channels_max will be 2.
>the difference of configuration will be absorbed by the plug-in of 
>alsa-lib and oss-emulation module.
>  
>

-Jeff




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