[vorbis-dev] Book descriptions?

Monty xiphmont at xiph.org
Tue Aug 29 15:37:47 PDT 2000



> >Can anybody tell me where I can find some info on the new books? I noticed
> >there are now A-E. What exactly does this mean? How does it translate to
> >higher and lower sampling frequencies and bit rates? Ideally I'd like
> >something in the 11kHZ, 8bit mono area...
> >
> >I also noticed this struct:
> >/* CD quality stereo, no channel coupling */
> >vorbis_info info_B={
> >  /* channels, sample rate, upperkbps, nominalkbps, lowerkbps */
> >  0, 2, 44100, 0,0,0,
> >  /* smallblock, largeblock */
> >  {256, 2048}, .....
> >
> >Does this mean I can just start tweaking away by changing the channels,
> >sample rate upper, nominal and lower? I'm guessing no, since I'm pretty sure
> >this must screw up some math somewhere...how does one actually tell the
> >encoder that they want these settings?
> 
> Yes, you can change any of those settings. However...

Also note int he above struct, that's the global samplerate, etc.... there are 
independant settings in several backend mappings for cases where having a 
different sample rate and nyquist frequency in floor encoding would make 
sense, etc...

So you can just frob the values, but make sure you catch them all.

> I think Monty intends to add a better way of selecting bitrates
> (programatically, rather than just picking a single fixed mode) at a later
> date

Correct.  I'm setting up that interface RSN.

Monty

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