Avoids an option name conflict with libavcodec, which is needed in order
to work properly with avconv.

Damaged frames can lead to a mismatch, which can cause a segfault
due to using an incorrect channel mapping.

CC:libav-stable@libav.org

The enabled hwaccels are listed later anyway.
Signed-off-by: Mans Rullgard <mans@mansr.com>

While we do not use Automake in libav, this allows our config to be
used more globally without introducing unwanted breakage.

The init functions marked as av_cold have to be executed in any case,
so there is no gain from trying to mark paths leading to such functions
as unlikely.

This also allows libx264 to modify its i_qfactor value
when using the "-tune" setting. Previously it had a static
value of 1.25
Signed-off-by: Anton Khirnov <anton@khirnov.net>

CC:libav-stable@libav.org

Avoids crashes with corrupted files.

CC:libav-stable@libav.org

CC:libav-stable@libav.org

CC:libav-stable@libav.org

When byte_run is 0, pixel_countdown is not touched and the loop will run
forever.

CC:libav-stable@libav.org

CC:libav-stable@libav.org

range == 0 happens with corrupted files

CC:libav-stable@libav.org

CC:libav-stable@libav.org

CC:libav-stable@libav.org

This fixes crashes in chromium on win64 on machines with AVX
(crashes that apparently aren't triggered by fate).
Signed-off-by: Martin Storsjö <martin@martin.st>

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

This gets rid of a number of warnings about casts discarding
qualifiers from the pointer target, present since 7ebfb466.
Signed-off-by: Martin Storsjö <martin@martin.st>

Instead, only extend edges on-demand when the motion vector actually
crosses the visible decoded area using ff_emulated_edge_mc(). This
changes decoding time for cathedral from 8.722sec to 8.706sec, i.e.
0.2% faster overall. More generally (VP8 uses this also), low-motion
content gets significant speed improvements, whereas high-motion content
tends to decode in approximately the same time.
Signed-off-by: Martin Storsjö <martin@martin.st>

Instead, keep them in the bitstream buffer until we read them verbatim,
this saves a memcpy() and a subsequent clearing of the target buffer.
decode_cabac+decode_mb for a sample file (CAPM3_Sony_D.jsv) goes from
6121.4 to 6095.5 cycles, i.e. 26 cycles faster.
Signed-off-by: Martin Storsjö <martin@martin.st>

This allows more transparent mixing of get_bits and whole-byte access
without having to touch get_bits internals.
Signed-off-by: Martin Storsjö <martin@martin.st>

These functions are mostly H264-specific (the only other user I can
spot is bink), and this allows us to special-case some functionality
for H264. Also remove the 16-bit-coeff with >8bpp versions (unused)
and merge the duplicate 32-bit-coeff for >8bpp (identical).
Signed-off-by: Martin Storsjö <martin@martin.st>

These functions do the same thing in 16 bit space and don't need
any depth specific clipping.
Signed-off-by: Martin Storsjö <martin@martin.st>