This removes a dependency on implementation details from generic
code and allows easy addition of the equivalent optimisation for
other architectures than x86.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Add -D_XOPEN_SOURCE=600 to host cflags to make the constants in math.h
available. Include math.h where necessary and remove redundant M_PI
defines.

Signed-off-by: Martin Storsjö <martin@martin.st>

Its documentation states that it is allocated/freed by the caller, but
it is declared as an AV_OPT_TYPE_STRING AVOption. Since
367732832f the AVOptions system frees
strings automatically. This can be considered an API break, since it
won't work when the caller doesn't use av_malloc() to allocate the
memory or wants to use the string after closing the codec.

Since there is not much value in this field being an AVOption, the best
solution is to remove it from the options table.

'channel_layout' not 'channels' from the stored configuration should go
to AVCodecContext's 'channel_layout'.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Add a note that pkt->data and pkt->size must be initialized.

Signed-off-by: Martin Storsjö <martin@martin.st>

The library is 3-clause BSD licensed.

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Mans Rullgard <mans@mansr.com>

2x speedup of surround decoding on Cortex-A9.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

We generally do not declare variables within for statements and
there are compilers that choke on such constructs.

Fixes infinite loop in FLAC decoding in case of a truncated bitstream due to
the safe bitstream reader returning 0's at the end.

Fixes Bug 310.

CC:libav-stable@libav.org

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Override the frame size from the SPS with AVCodecContext values
if the latter specify a size smaller by less than one macroblock.
This is required for correct cropping of MOV files from Canon cameras.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Unlike its predecessor, Indeo Audio codec generates tables depending on
sampling rate. Previously decoder used pre-generated tables for 22050 Hz
which obviously doesn't work with other frequencies.

Many thanks to Maxim Poliakovsky for providing all needed information
for this.

It turns out that this frame type is actually intra and should be used as
a reference for interframes too.

Move vector_fmul() from DSPContext to AVFloatDSPContext.

This will allow for easier implementation of Altivec functions in libraries
other than libavcodec.

This will allow for easier implementation of ARM-optimized functions in
libraries other than libavcodec.

This ensures that these functions are inlined into the per-position
entry points, allowing constant propagation as needed for proper
optimisation.

18% faster VC1 decoding on Cortex-A9.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Duplicate values in this vector are explicitly banned by the Vorbis I spec
and cause divide-by-zero crashes later on.

This will be useful for Indeo Audio decoder which is almost the same
but supports stereo.

This will be useful for Indeo Audio decoder which is almost the same
but supports stereo.

In Musepack SV8 codec property tell the maximum nonzero band, but every
frame codes maximum band as a limit (i.e. strictly less than given value).
Synthesis also expects maximum nonzero band, so there's a need to convert
frame maximum band limit value.

This makes decoder handle random data passed as BMV frame data.

Use correct side data size instead of just zeroed field.

This prevents gcc from assuming that contents of it may have changed
between calls to vp56_range_get_prob(), thus preventing countless (and
unnecessary) movs. Decoding of sintel trailer goes from (avg+SG) 9.796
+/- 0.003 to 9.635 +/- 0.010.

We support every defined value for channel layout, bitrate and sample depth.
All other values are not unsupported, but reserved.
Update comments to say "are used" instead of "are known or exist".

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

This silences some valgrind warnings.
CC: libav-stable@libav.org

Fixes second half of http://ffmpeg.org/trac/ffmpeg/ticket/794
Bug found by: Oana Stratulat

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit f85334f58e)

This is needed for older versions of yasm/nasm that do not support AVX.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

Signed-off-by: Diego Biurrun <diego@biurrun.de>