Causes a warning with -Wnull-pointer-arithmetic and the code wasn't doing
anything anyway (the ctl call ignores NULLs)

This gets rid of false positives in static analysis
(see https://trac.webkit.org/changeset/232236/webkit)

Fixes test_opus_projection failure under ubsan, due to clz(0).

Don't assume that frames larger than 20 ms save any overhead compared to 20 ms.

The bug was triggered because f982b84d started using prefill for
SILK bandwidth changes, which reinitialized the encoder state and
prevented the variable lowpass from working properly. To fix the problem,
we preserve the sampling rate and variable low-pass when prefilling.

Using a finer table for the rate to SNR curves in silk_control_SNR().
It's now possible to have an SNR that reaches 0, so we can lower bitrate
down to ~5 kbps for narrowband and 5.5 kbps for wideband.

NaNs should be filtered at the Opus layer, so if there are any in the CELT
encoder, then it's likely something went horribly wrong (e.g. corrupted state).
In that case, better abort than have something bad happen.

Gustaf Ullberg authored 6 years ago and Jean-Marc Valin committed 6 years ago

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

It is the size array that must be non-null.

Only converted the ones that are really sure (not signal-dependent)
and that shouldn't add much run-time complexity

We make sure the CELT PLC we do in the transition uses the same bandwidth
as the previous (CELT) packet and not the new bandwidth

Enables "safes" assertions even with ENABLE_ASSERTIONS isn't set

Andrew Allen authored 7 years ago and Jean-Marc Valin committed 7 years ago

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

A second-order DC rejection filter is uselsss unless we have complex
poles. However, complex poles means we have to compute the filter as a
single pass (rather than two casdaded first-order filters), which has
numerical issues that would require a higher complexity to solve.
So rather than waste cycles with a second-order filter (with a longer
impulse response), we just go with a first-order filter.

It adds a libssp-0.dll dependency and prevents static linking

Gustaf Ullberg authored 7 years ago and Jean-Marc Valin committed 7 years ago

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

The size overhead seems to be about 1% and the speed overhead is
"in the noise" (<2%).
The automake code is copied from opus-tools

Fixes a "regression" from 1.2 to 1.3-beta that was especially noticeable
on a Korean speech sample. (it wasn't a real regression since 1.2 only
worked because it was using CELT)

Reported by Chandrakala Madhira on the mailing list

Reported by daddesio in #opus

This improves cases where a whole region is dominated by a handful of tones