CELT TODO: Difference between revisions

From XiphWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 1: Line 1:
== Open issues ==
== Open issues ==
* <strike>Spreading/folding/strike>
** <strike>Uniform quantisation/strike>
** <strike>Control over the amount of spreading/folding introduced/strike>
** <strike>Make it have the same shape as the rest of the spectrum</strike>


* Tuning
* Tuning
Line 17: Line 12:


* Transients
* Transients
** Energy weighting pre- or post-normalization?
** Haar/Hadamard
** Include energy shape?
** Delta adjustment
** Can we remove all of the old code?
** Split below 32-bit
** Partial remixing of short blocks?
** Partial remixing of short blocks?


* Make split more efficient
* Make split more efficient
** Support for LN=-1


* Minimise bits left after PVQ
* Minimise bits left after PVQ

Revision as of 17:20, 20 May 2010

Open issues

  • Tuning
    • Band layout (spacing)
    • Bit allocation
      • Main table
      • Stereo
      • qtheta offset
      • fine offset
      • energy prediction parameters (means, decay)
    • Spreading/folding parameter
  • Transients
    • Haar/Hadamard
    • Delta adjustment
    • Can we remove all of the old code?
    • Split below 32-bit
    • Partial remixing of short blocks?
  • Make split more efficient
    • Support for LN=-1
  • Minimise bits left after PVQ
    • Reverse band ordering?
    • Fractional pulses?
  • 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?