ptrdiff_t can be 4 bytes, which leads to the next element being 4-byte
aligned and thus at a different offset than intended. Forcing 8-byte
alignment forces equal offset of dither16/32 on x86-32 and x86-64.
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>

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

This reduces startup latency for make invocations, which is especially
noticeable on systems that are slow or have slow I/O, like Windows.

Declaring tools associated with each library in their respective
makefiles allows these tools to easily depend on the correct
prerequisites and link against the libs they need.
Signed-off-by: NMans Rullgard <mans@mansr.com>

The output from -v with gcc 4.6 has changed such that the search
pattern matches too soon without making it more strict.
Signed-off-by: NMans Rullgard <mans@mansr.com>

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

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

This macro can cause problems in conjunction with the bitdepth
template expansion.  It was presumably added to keep source
compatibility when high bitdepth support was added.  However,
emulated_edge_mc is a dsputil pointer and should not be called
directly, so there is little reason to keep such a macro.
Signed-off-by: NMans Rullgard <mans@mansr.com>

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

This decreases startup latency.
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>
Signed-off-by: NAnton Khirnov <anton@khirnov.net>

Deprecate avcodec_alloc_context/2.

It should be replaced with proper per-codec defaults.

Deprecate corresponding AVCodecContext option.

This is the first test of decoder private options.

It supports passing options to codecs.

Adds support for decoder-private options and makes setting other options
simpler.

In testing, the file output plugin gave a max buffer size of about 20 million
frames, which is way more than what is really needed and causes a memory
allocation error on my system.

buffer_size/4 is the value used by aplay. This fixes output to null
devices, e.g. writing ALSA output to a file.

Instead, just decrease it to a valid value and use that.
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>

Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>

Set DV packet durations using fields_per_frame.
This requires turning gxf_stream_info into the demuxer's context for access to the value in gxf_packet().
Since MPEG-2 seems to work fine this done only for DV.
Signed-off-by: NAnton Khirnov <anton@khirnov.net>

libavcodec/libxvidff.c:752: warning: initialization discards qualifiers from pointer target type

Eliminate redundant check in filter_mb_fast, consider bit depth in calculating qp_thresh.

Inline the relevant parts of fill_decode_caches into P-SKIP mv prediction to
avoid calling the whole thing.

These weren't getting inlined all the time in all gcc versions.

Mainly ported from 8-bit H.264 predict.

Some code ported from x264. LGPL ok by author.
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>

Based on a somewhat similar idea in FFmpeg's swscale.

Based on a somewhat similar idea in FFmpeg's swscale copy.

We operated on 31-bits, but with e.g. lanczos scaling, values can
add up to beyond 0x80000000, thus leading to output of zeroes. Drop
one bit of precision fixes this.

We accessed the alpha array even it wasn't used and didn't
exist, hence leading to a NULL pointer segfault.

When using e.g. lanczos scaling, values can drop below 0, so they
should never be unsigned.

We would use the second half of the U plane buffer, rather than the
V plane buffer, to output the V plane pixels.