[speex-dev] Speex configuration

[Jean-Marc Valin]

> - abr_bitrate
>     - use average bitrate and set it using bitrate parameter
>     - SPEEX_SET_ABR

OK

> - cbr_bitrate
>     - use constant bitrate and set it using bitrate parameter
>     - SPEEX_SET_BITRATE

OK

> - cbr_mode
>     - use constant bitrate and set it using mode parameter
>     - SPEEX_SET_MODE

Works, but normally a user should have to see the modes.

> - cbr_quality
>     - use constant bitrate and set it using quality parameter
>     - SPEEX_SET_QUALITY

OK

> - vbr_bitrate
>     - use variable bitrate and set it using bitrate parameter
>     - SPEEX_SET_BITRATE + SPEEX_SET_VBR

No, with VBR, you need to call SPEEX_SET_VBR_QUALITY. Setting the
bit-rate for VBR is ABR.

> - vbr_mode
>     - use variable bitrate and set it using mode parameter
>     - SPEEX_SET_MODE + SPEEX_SET_VBR

No, no, no!

> - vbr_quality
>     - use variable bitrate and set it using quality parameter
>     - SPEEX_SET_VBR_QUALITY

OK, as long as you set SPEEX_SET_VBR

> If I look at the code, vbr_bitrate and vbr_mode probably
> doens't work (vbr uses vbr_quality and this is only initialized when using
> SPEEX_SET_ABR or SPEEX_SET_VBR_QUALITY).
> I have also been looking at draft-herlein-speex-rtp-profile-02.txt
> and it seems to me that then the vbr + mode option doesn't make sense.

See above.

        Jean-Marc


-- 
Jean-Marc Valin
http://www.xiph.org/~jm/
LABORIUS
Université de Sherbrooke, Québec, Canada


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