[Asterisk-Dev] Voicemail to email volume change patch

[Aaron Daniel]

Well, I think we're calling it normalize cause that name sorta stuck. 
We are in fact just changing the volume of it, and using sox, cause as 
you say, it supports more formats.  Normalize just didn't do what we 
wanted it to, and didn't support the format we were using, so sox seemed 
like a much better idea for the time being.

Aaron

Steven Critchfield wrote:
> On Fri, 2006-01-13 at 11:15 -0600, Aaron Daniel wrote:
>> My boss and I have been working on a patch to the voicemail code, and 
>> I'd like to see what everyone thinks of it.  I'd like suggestions and 
>> stuff on anything that needs to be changed, as this is the first time 
>> we've patched the code, and would like to submit it for use later on in 
>> the code.
>>
>> It basically sends the voicemail attachment through sox to increase (or 
>> decrease) the volume of the message as need be, and then sends the 
>> normalized file to the user.
> 
> You aren't normalizing the audio, you are just adjusting the volume. If
> you are going to go to the work of using an external app, why not use
> normalize so it truly is normalized and doesn't introduce problems when
> audio comes from different sources and therefore needs different audio
> adjustments.
> 
> Now the trouble with normalize is that it doesn't support very many
> formats. I think it supports PCM wav and mp3 only. At least sox does
> have better format support.