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

Timothy B. Terriberry authored 13 years ago and Jean-Marc Valin committed 13 years ago

The range decoder used to initialize nbits_total after the
 renormalization loop, even though the renormalization loop
 modifies it.
This was presumably safe, because nothing actually used the value
 before it was initialized, but I'm tired of it triggering the
 integer overflow checking.

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

This has no impact on opus_demo, test vectors, or "normal" codec operation

SHARK compiler treaks "bank" as a reserved keyword -- go figure.

Ralph Giles authored 13 years ago and Jean-Marc Valin committed 13 years ago

C reserves identifiers of the from _[A-Z]+ and we have a number of
those in the code. This patch renames the various function arguments,
MACROS and preprocessor symbols to avoid the reserved form.

It also removes the CHANNELS() macro altogether. This was a
minor optimization for TI DSP to force a mono-only build,
as were the associated local 'const' versions. Since stereo
support is manditory, it wasn't worth keeping.

Thanks to John Ridges for raising the issue, and Jean-Marc Valin
and Greg Maxwell for reviewing the changes.

These fix corner cases discovered during the latest fuzzing tests.

Ralph Giles authored 13 years ago and Jean-Marc Valin committed 13 years ago

We use macros to encapsulate the appropriate type and size
information for the different CTL requests, but the macros
still need to be used with the _ctl() function call and an
encoder or decoder instance structure. As such, just listing
the macro defines is confusing. Adding some examples outside
the OpusEncoder overview page should help with this.

Also document that OPUS_SET_APPLICATION can take
OPUS_APPLICATION_RESTRICTED_LOWDELAY.

Also regularises some Canadian spelling to US like the rest of
the document.

This fixes the tracking of the CELT anti-collapse energy. In some cases,
the energy for bands that weren't coded wasn't updated and could
come from old frames.

Undocumented for now

Ralph Giles authored 13 years ago and Jean-Marc Valin committed 13 years ago

Remove a trailing tab, and unexpand some tabs in the
source listing.

Undocumented for now.

The CELT encoder could end up using a non-max bit-rate and not use
all the bytes it's supposed to use.

Multistream encode was failing to add the length of the extra length for
self-delimited packets causing corrupted output. Multistream decode was
not properly handling lost frames (and potentially reading out of bounds
as a result).

GET_FINAL_RANGE has been implemented as the xor of the final range of all
the streams in the packet.

test_opus_encode now does the mono narrowband tests using dual-mono
multistream.