CELT TODO

Open issues

• Spreading/folding
  • Uniform quantisation
  • Control over the amount of spreading/folding introduced
  • Make it have the same shape as the rest of the spectrum

• Tuning
  • Band layout (spacing)
  • Bit allocation
  • Spreading/folding parameter

Other decisions to make

• Should we use raw bits or now?
• What should we do about remaining bits after the last PVQ?
  • more fine energy?
  • encode bands backward?
  • allow "fractional pulses"

Old TODO list

• raw bits
• Use the last bits after PVQ (for fine energy?)
• adaptive folding
  • finalize folding details
  • Decide on folding gain
• dynamic allocation
• Using PVQ for coarse energy?
• configuration packet
• revisit stereo coupling
• stereo allocation
• tune everything
• increase max pulses
  • more pulses for N>5
  • Fast CWRS for N=3
  • change if(_n<=6) to if(_n<=6 || _m>255) in ncwrs_u32
  • Use real limits in fits_in32()
• Tune for lower sampling rates
• Improve dynamic range by changing the energy floor
• Laplace encoder
  • Make ft=32768 to save some divisions
  • Use the last symbols to have a wider range
• Investigate other transient algorithms
  • energy weight