[pjsip] Speex basic VBR and ABR support [PATCH]

[Roman Imankulov]

Hi,

I'd like to propose to implement in PJMEDIA library such codec features 
as Speex VBR (variable bit-rate) and ABR (average bit-rate). In order to 
make one little step forward I propose the patch with basic 
implementation of these features.

The patch has just one new API function: pjmedia_codec_speex_vbr_init(). 
This function,  in comparison with pjmedia_codec_speex_init(), receives 
two additional optional parameters:

  -  float vbr_quality
  -  int abr_bitrates[3] (three average bitrates values for narrowband, 
wideband and ultra-wideband mode in this order).

I see that this patch maybe looks like a quick and somewhat dirty hack, 
but it retains PJMEDIA backward compatibility, and I keep the hope that 
it can become a base of the new functionality.

-- 
Roman Imankulov
roman at netangels.ru
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