Speex dev - Nov 2006 - Quick survey for Speex 1.2

> The mode/bit-rate is detected automatically by the decoder because it's
> encoded in the first few bits of each frame. The encoder can change
> bit-rate at any time without telling the decoder. Can you be more
> precise as to what isn't clear?

I think that one got me too. If mode is detected automatically by the 
decoder, what is the purpose of the 'mode' parameter in 
speex_decoder_init function?

I'd file it under confusing API. Or am I missing something here (again)?

Gregg

> I think that one got me too. If mode is detected automatically by the
> decoder, what is the purpose of the 'mode' parameter in
> speex_decoder_init function?
Well, the mode there is just for narrowband vs wideband. While the
narrowband decoder can still decode wideband, it would leave out the
high frequencies.

	Jean-Marc

How about the voice quality of narrowband decoder when it is used to decoder
wideband?
I think it will be worse than wideband decoder. Thus, an indicator is needed
here.

The current RTP profile draft is not clear on that.

Lianghu

On 11/15/06, Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
wrote:
>
> > I think that one got me too. If mode is detected automatically by the
> > decoder, what is the purpose of the 'mode' parameter in
> > speex_decoder_init function?
>
> Well, the mode there is just for narrowband vs wideband. While the
> narrowband decoder can still decode wideband, it would leave out the
> high frequencies.
>
>         Jean-Marc
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