Difference between revisions of "CELT TODO"

From XiphWiki
Jump to navigation Jump to search
m
m (Add notice that CELT was merged into Opus)
 
(75 intermediate revisions by 3 users not shown)
Line 1: Line 1:
 +
{{Obsolete|The CELT codec has been merged into the IETF [[Opus]] codec and is now obsolete}}
 
== Open issues ==
 
== Open issues ==
  
* Spreading/folding
+
== Post-freeze ==
** Uniform quantisation
+
* VBR waste prevention
** Control over the amount of spreading/folding introduced
+
* More intelligent VBR decisions
** Make it have the same shape as the rest of the spectrum
+
* Denorm prevention
 +
* Ogg mapping (including >2ch; LM/ch switching)
  
* Tuning
+
[[Category:Opus]]
** Band layout (spacing)
 
** Bit allocation
 
*** Main table
 
*** Stereo
 
*** qtheta offset
 
*** fine offset
 
** Spreading/folding parameter
 
 
 
* Transients
 
** Energy weighting pre- or post-normalization
 
** Include energy shape?
 
** Partial remixing of short blocks?
 
 
 
* Dynamic allocation
 
** Include a way to deviate from the normal bit allocation?
 
 
 
* Better stereo coupling
 
** Better support for "intensity stereo"?
 
 
 
== Other decisions to make ==
 
* Should we use raw bits or not?
 
* What should we do about remaining bits after the last PVQ?
 
** more fine energy?
 
** encode bands backward?
 
** allow "fractional pulses"
 
* Include a configuration packet for more flexibility? (probably not)
 
* Use a min width for ebands that's equal to the number of short blocks?
 

Latest revision as of 05:31, 23 June 2016

Open issues

Post-freeze

  • VBR waste prevention
  • More intelligent VBR decisions
  • Denorm prevention
  • Ogg mapping (including >2ch; LM/ch switching)