[pjsip] quick question about volume and PJSUA-LIB

[C R McClenaghan]

Benny,

Based on the sample application, I was experimenting with separate  
volume control over the "bridge" versus over any attached "leg". I  
have modified the sample application so I can set volume on any  
attached port as well as port 0. In doing this I've found that I  
cannot  manage the volume in the expected fashion. Applying 2.0 should  
double, applying 0.5 should halve. However,  it appears that these or  
more absolute than relative. Repeated application of 0.5 does not  
reduce the volume on the second and subsequent applications - the  
volume remains the same. I had expected to eventually get an effective  
mute.

The discussion with Jim lead to an absolute range of 0 to 255 and  
controls that reflected that. The remainder of the discussion had to  
do with min/max as macros and linker problems I had using them on the  
Mac.

So, questions: Is the intent of pjmedia_conf_adjust_tx_level and  
pjmedia_conf_adjust_rx_level to provide relative volume control or  
absolute? Is this possibly dependent on the underlying hardware?

Chris

On Mar 10, 2009, at 10:23 AM, Benny Prijono wrote:

> Not sure if I'm following this thread correctly, but yes there's no  
> upper limit in the level value. If you give it 0.5, the volume will  
> be halved, if you give it 2.0, it will be twice as loud, and so on.
>
> cheers
>  Benny
>
> On Tue, Mar 10, 2009 at 4:04 PM, C R McClenaghan <chris at mcclenaghan.com 
> > wrote:
> All,
>
> Careful readers will have noted the logic error in the statement  
> below. It should read:
>
> int newlevel = (0 < ((int) level < 255 ? (int) level : 255) ? (int)  
> level : 0);
>                                ^
>                                ^
>
> Chris
>
>
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