[Speex-dev] Obtaining loudness information in 1.2beta2

[Mihai Balea]

What would be a good parameter to return that would better represent  
the loudness of the signal?
As for the your other comments, I'll make the necessary changes and  
resubmit.

Thanks,
Mihai

On Oct 25, 2007, at 7:45 PM, Jean-Marc Valin wrote:

> I'm in favor of the idea, but not of the current implementation. There
> are two problems:
> 1) The st->loudness parameter doesn't represent the amplitude of the
> signal, but the amplitude^5 (fifth power). That makes it hard to use
> 2) The call returns a float, but it should really be an int
> (spx_int32_t) so that it can work easily with fixed-point code
>
> There's a last minor thing: instead of  
> SPEEX_PREPROCESS_GET_LOUDNESS, it
> should be called SPEEX_PREPROCESS_GET_AGC_LOUDNESS. If you can send  
> me a
> patch that addresses these issues, I'll gladly apply it.
>
> 	Jean-Marc
>
> Mihai Balea wrote:
>> Hi all,
>>
>> I'm working on a project called iaxclient
>> (http://sourceforge.net/projects/iaxclient).
>> We use speex for the majority of our audio processing, including  
>> voice
>> compression and processing.
>> One of the features of iaxclient is Analog AGC, which drives the
>> hardware mixer levels based on signal loudness.  Up until  
>> 1.2beta1, we
>> were able to access the internals of the SpeexPreprocessState  
>> structure
>> to get loudness information, but, of course, that is no longer  
>> possible
>> with 1.2beta2.  I would like to propose an addition to the  
>> preprocessor
>> control interface that exposes that parameter.  I'm attaching a patch
>> that contains the proposed change.
>>
>> I'm looking forward to any comments and suggestions.
>>
>> Cheers,
>> Mihai
>>
>>
>>
>> --------------------------------------------------------------------- 
>> ---
>>
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>> Speex-dev mailing list
>> Speex-dev at xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
>
>

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