We now try not to fold below band 17 since that produces a lot of harshness.
This mostly helps around 32-40 kb/s.

Fix Hybrid redundancy assertion failure in ec_enc_shrink(), even
if SILK produces more than maxBits, by reducing or eliminating
redundancy when necessary.  Don't reserve space for redundancy that
is too small to be used for redundancy.  When there is not enough
space for redundancy, allow the regular frame to use all the bits.

With packets of 80 ms or more, a SILK bandwidth switch was missing
the second half of the redundancy, because st->silk_bw_switch was
cleared too early before any recursive calls.

As reported by agatx in https://trac.xiph.org/ticket/2291

Reported by wtchang in trac: https://trac.xiph.org/ticket/2160

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

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

These rely on TF rather than short windows to avoid partial collapse.

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

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

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

Also clean up comments from the last patches

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

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

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

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

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

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

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

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

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

The transient detector would trigger on low-pitch vowels, but we didn't have
enough bits to properly code the high bands as a transient, resulting in
partial collapse and unstable energy.

Different distributions of doxygen have different default
values of HAVE_DOT setting, so we need to pick a specific
setting to avoid 'missing dot' warnings on some platforms.

Doxygen uses it to generate inclusion graphs for our various
header files, which is somewhat useful, but not essential.
We therefore enable dot if it's present (usually through
the parent graphviz package) but disable it if it's not
available, silencing the warning, but not giving uniform
results.

Without that, we could bust the budget and end up with the
if (ec_tell(&enc) <= 8*nb_compr_bytes)
being false, followed by an assert failure later.

Reported by Mark Warner.

memcpy() aliasing bug caught by Felicia's encoder fuzzing test

This should also avoid cases where stereo streams receive fewer
bits than mono streams.

Michael Graczyk authored 8 years ago and Jean-Marc Valin committed 8 years ago

Change-Id: I16bd4cd990d8ad5888c9e30016218ac25242ecb5

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

The encoder would reserve bytes for redundancy and then decide to use
CELT, but not use those bytes.

Also avoids stupidly high/low rates

Also clarify in doc that conformance issue relates to decoder only.