Works by turning off pitch and energy prediction in CELT, while
setting first_frame_after_reset in SILK to disable pitch and LSF interpolation
and reduce LPC gain.

Since the last patch originally had them mangled (presumably by
 mailer, http server, or something else), let's just get rid of
 them.

Only encoder changes were necessary because this uses the same
"redundant frames" mechanism as SILK<->CELT switching.
This also fixes a regression introduced in 78291b27 that was
causing the encoder to go back and forth between bandwidths when
SILK wasn't ready to change.

This is achieved by running the encoding process in a loop and
padding when we don't reach the exact rate. It also implements
VBR-with-cap, which means we no longer need to artificially decrease
the SILK bandwidth when it's close to the cap.

- There was a bug where the decoder resampler was not properly initialized
when fs_kHz == API_fs_kHz. In that case the resampler would continue to
upsample, and the output was corrupt.

- The delay value in the decoder was taken from the state before it was
potentially updated. This caused the decoder to apply the new dalay value one
frame late

- The encoder and decoder states are now updated more consistently, when
the sampling rate changes (pesq liked these changes)

- Properly resetting the side channel encoder and decoder for the first
frame with side coding active again

- Faster updating the "ratio" value in the LR_to_MS() code for large
prediction values means that for certain extreme/artificial input
signals the output looks better

Delaying stereo->mono switching decisions so that SILK can do a smooth
downmix. Also, wrote proper float/fixed code for the hybrid variable
stereo collapse, including a smooth downmix for stereo<->mono switching

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

whitespace.

commit 5b64cf7c4d67af9050bc959996ef976ce6326888
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date:   Thu May 19 16:40:35 2011 -0400

    Fixes a few bugs introduced in the latest update

commit b91eb86025d2de3c4cf04f4fb1aa48a28ad676a3
Author: Timothy B. Terriberry <tterribe@xiph.org>
Date:   Thu May 19 16:12:02 2011 -0400

    build_draft.sh fixes

commit 0b10c30db7ad60ff7d4bfc1139bdb86e0543c035
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date:   Thu May 19 15:30:21 2011 -0400

    Fixes the draft build

commit 164424cded5978e657105104e171ac202dde5e5b
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date:   Thu May 19 15:00:23 2011 -0400

    Updated build system

commit 188d9fcba8c3a1b1ad67c67c430e1b37e3658a40
Author: Koen Vos <koen.vos@skype.net>
Date:   Thu May 19 17:14:57 2011 -0400

    SILK/Opus update

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

commit c44b37355295df2963daa724649ff1876b690488
Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
Date:   Wed Apr 27 00:33:12 2011 -0400

    decoder size fix

commit 78f864e9ddacd94d03d717d79a6e606712e25edd
Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
Date:   Tue Apr 26 23:26:14 2011 -0400

    Makefile fix

commit a0e884e463af88bcaa2f410ea8cc85e5bebd2c3b
Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
Date:   Tue Apr 26 22:53:27 2011 -0400

    Making some progress

commit 9e30457f2199bba7b5e37bb577ff75dc85ba9306
Author: Koen Vos <koen.vos@skype.net>
Date:   Tue Apr 26 22:29:42 2011 -0400

    SILK update with stereo support