Gregory Maxwell authored 12 years ago and Jean-Marc Valin committed 12 years ago

OpusCustomMode begins with a pointer and was getting misaligned on 64 bit arches.

Timothy B. Terriberry authored 12 years ago and Jean-Marc Valin committed 12 years ago

Including a description of the PVQ encoder and decoder

Also added 3rd clause to "master" COPYING file

See http://www.ietf.org/mail-archive/web/codec/current/msg02833.html
Still more changes to come

Gregory Maxwell authored 13 years ago and Jean-Marc Valin committed 13 years ago

This fixes some problems with cross-compiles.

- Draft updates
- Updated code to produce and check test vectors
- Making sure that the test vectors pass at all rates as well as for mono and stereo

Also using the same int->float conversion functions for SILK as for CELT
and changed encoder implementation default to constrained VBR just to
be safe when VBR gets more aggressive.

Koen Vos authored 13 years ago and Jean-Marc Valin committed 13 years ago

Also adds the encoder part of commit ee8adbe7 as well as a few
minor cleanups.

Gregory Maxwell authored 13 years ago and Jean-Marc Valin committed 13 years ago

No changes to the codec itself.

This is not strictly necessary because the only streams that cause these
already sound horrible, but it helps the testing process.

- Safer gain clamping for PLC
- Makes opus_decoder_get_nb_samples() report an error on invalid ToC
- Giving a free license to the text ofthe draft (not just the code)

Koen Vos authored 13 years ago and Jean-Marc Valin committed 13 years ago

Also clamps the gain to avoid forcing a float decoder to emulate the
state rescaling.

- When it cannot produce the rate it's being asked, the encoder now
  returns a "PLC packet"
- Makes it possible to use the CELT PLC for more than 20 ms

Koen Vos authored 13 years ago and Jean-Marc Valin committed 13 years ago

decoder:
- fixed incorrect scaling of filter states for the smallest quantization
  step sizes
- NLSF2A now limits the prediction gain of LPC filters

encoder:
- increased damping of LTP coefficients in LTP analysis
- increased white noise fraction in noise shaping LPC analysis
- introduced maximum total prediction gain.  Used by Burg's method to
  exit early if prediction gain is exceeded.  This improves packet
  loss robustness and numerical robustness in Burg's method
- Prefiltered signal is now in int32 Q10 domain, from int16 Q0
- Increased max number of iterations in CBR gain control loop from 5 to 6
- Removed useless code from LTP scaling control
- Optimization: smarter LPC loop unrolling
- Switched default win32 compile mode to be floating-point

resampler:
- made resampler have constant delay of 0.75 ms; removed delay
  compensation from silk code.
- removed obsolete table entries (~850 Bytes)
- increased downsampling filter order from 16 to 18/24/36 (depending on
  frequency ratio)
- reoptimized filter coefficients