Prevents integer overflow UB in the shift rounding when the signal blows
up on bad bitstreams (if it triggers, the signal was already unusable
anyway).

Gives us a tighter bound on the pitch postfilter input to avoid overflows

Viswanath Puttagunta authored 9 years ago and Jean-Marc Valin committed 9 years ago

Optimize opus decode (float only) use case using ARM NE10.
Mainly effects opus_ifft and ctl_mdct_backward and related
functions.

Work based on previous Encode optimization using ARM NE10
library. See previous commit for details on how to enable
this.

Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>

Viswanath Puttagunta authored 9 years ago and Jean-Marc Valin committed 9 years ago

Optimize opus encode (float only) usecase using ARM NE10
library. Mainly effects opus_fft and ctl_mdct_forward
and related functions.

This optimization can be used for ARM CPUs that have NEON
VFP unit. This patch only enables optimizations for ARMv7.

Official ARM NE10 library page available at
http://projectne10.github.io/Ne10/



To enable this optimization, use
--enable-intrinsics --with-NE10=<install_prefix>
or
--enable-intrinsics --with-NE10-libraries=<NE10_lib_dir> --with-NE10-includes=<NE10_includes_dir>

Compile time checks made during configure process to make sure
optimization option available only when compiler supports NEON
instrinsics.

Runtime checks made to make sure optimized functions only called
on appropriate hardware.

Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>

Rhishikesh Agashe authored 10 years ago and Jean-Marc Valin committed 10 years ago

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

Marcello Caramma (mcaramma) authored 11 years ago and Jean-Marc Valin committed 11 years ago

In that case, the yp0 and yp1 ended up aliasing for the last element,
despite being marked as restrict.

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

Since we're doing two rotations, we can invert the sign on both.
Also adding a few comments for optimizing the FFT.

Also simplifying the code

Undoes commits f7547a4e and 72513f3c

IMDCT now uses the forward FFT.

Nils Wallménius authored 12 years ago and Jean-Marc Valin committed 12 years ago

Gets rid of one stack buffer.

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

Adds more sizes to test_unit_mdct.c

Nils Wallménius authored 12 years ago and Jean-Marc Valin committed 12 years ago

Place output of imdct post-rotate and deshuffle in out buffer to avoid copying and simplify the code.

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

Nils Wallménius authored 12 years ago and Jean-Marc Valin committed 12 years ago

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

Nils Wallménius authored 12 years ago and Timothy B. Terriberry committed 12 years ago

Saves some memory access and gives a tiny speedup

Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>

We had previously advised people to -Drestrict on
non-C99 compilers, but this creates problems for
some of the MSVC headers. Instead this just
uses a macro and defines it sanely.

Fixes two leakage problems on the wood blocks sample
- Removes DC which causes leakage with no masking
- Detect leakage by comparing short-MDCT energy to long-MDCT energy
  and boost allocation for bands with leakage

This reverts commit 9f407afa.

Also added 3rd clause to "master" COPYING file