This removes an unused definition warning when compiling without
 custom modes.

These are all completely untested.

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.

Padding is now handled by the repacketizer.

Newer versions of MSVC are unhappy with the strategy of the build
 environment redefining "inline" (even though they don't support the
 actual keyword). Instead we define OPUS_INLINE to the right thing
 in opus_defines.h.

This is the same approach we use for restrict.

Also makes the CTL bad argument handling more consistent to avoid mistakes
 like that in the future.  Also updates the variable duration docs.

Jacek Caban authored 11 years ago and Gregory Maxwell committed 11 years ago

Signed-off-by: Gregory Maxwell <greg@xiph.org>

The idea is that the rate of each stream is adjusted based on its
contribution to the total energy of a stereo downmix.

Conflicts:
	src/opus_multistream_encoder.c

opus_decode() and opus_multistream_decode() now apply soft clipping
before converting to 16-bit int. This should produce better a higher
quality result than hard clipping like we were doing before. The _float()
API isn't affected, but the clipping function is exported so users can
manually apply the soft clipping.

Variable duration option renamed to OPUS_SET_EXPERT_FRAME_DURATION,
with new API.
Also moves up the analysis to avoid having to do int->float conversion
on large buffers.

The search is based on minimizing the bitrate increase due to transients
by considering we can reduce the "transient boost" by reducing the frame
size, at the cost of increasing the normal overhead.

NB they only check for len < 1, not for null data.

PLC and FEC now return exactly the number of samples specified for the
buffer rather than (usually) returning the size of the last packet.
Doc and tests are updated accordingly.

OPUS_EXPORT was conditionalized on OPUS_BUILD, so that symbols
are export based on public header declarations when building
opus as a library, but not when those headers are included in
other programmes. This doesn't address the case when the opus
source and its caller are both included in the same monolithic
build.

In that case we want to define OPUS_BUILD, to indicate that we
are compiling the codec source, but not export the symbols. To
support this, only define OPUS_EXPORT if it is not already defined.
This allows build scripts to -DOPUS_EXPORT and override the
platform-specific attribute decortation in opus_defines.h.

Based on a patch by Sergey Ulanov.
http://git.chromium.org/gitweb/?p=chromium/deps/opus.git;a=commitdiff;h=6304b9628cb7244e3cc78f740aeb6659562f1857

Philip Jägenstedt authored 12 years ago and Gregory Maxwell committed 12 years ago

I stumbled upon the typo in README.draft, so took the opportunity to
grep for common misspellings using List_of_common_misspellings.txt for
hunspell.

This could be confusing/misleading.

Timothy B. Terriberry authored 12 years ago and Jean-Marc Valin committed 12 years ago

This patch also includes some small edits/additions to the main API
 documentation.

Timothy B. Terriberry authored 12 years ago and Jean-Marc Valin committed 12 years ago

This patch also includes some small edits for the main API
 documentation.

Timothy B. Terriberry authored 12 years ago and Jean-Marc Valin committed 12 years ago

This avoids allocating any buffers on the stack that depend on the
 total channel count.
Such buffers could easily exceed the size of the
 NONTHREADSAFE_PSEUDOSTACK.
It also checks the frame_size argument in both the encoder and
 decoder to avoid allocating large stack buffers for opus_encode()
 calls that would fail anyway or opus_decode() calls that would
 never use all that space anyway.

In particular we no longer document the default complexity because
we're not guaranteeing to keep the default value constant.  In the
future the default may be lowered in order to keep the default
speed constant.

In addition to general reformatting and cleanup, this fixes a
 couple of important mistakes:
- The arguments to OPUS_SET_FORCE_CHANNELS are now 1 and 2, not 0
   and 1 (as they were when this was called OPUS_SET_FORCE_MONO).
- The default encoder mode is now constrained VBR, not unconstrained
   VBR.
It also documents defaults for all the other parameters.

Jean-Marc Valin authored 12 years ago and Gregory Maxwell committed 12 years ago

This implements an API used in future encoders to avoid dynalloc doing silly things
on periodic LSB patterns and to reduce the bitrate on near-silence.