h264: avoid using uninitialized memory in NEON chroma mc

Adapt commit 982b596ea6640bfe218a31f6c3fc542d9fe61c31 for the arm and
aarch64 NEON asm. 5-10% faster on Cortex-A9.
dsputil: Split off global motion compensation bits into a separate context
pixfmt: mark the reserved values
jpeg2000: fix dereferencing invalid pointers during cleanup

CC: libav-stable@libav.org
Found-by: Laurent Butti <laurentb@gmail.com>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
h264: error out from decode_nal_units() when AV_EF_EXPLODE is set

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
mjpegdec: Properly set the context colorspace info

The JPEG spec requires it to be this.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
x86: h264dsp: Fix link failure with optimizations disabled

With optimzations disabled compilers have trouble doing dead code
elimination on 'if (foo && 0)' expressions, while 'if (0 && foo)'
still works, so use the latter to avoid problems.

Bug-Id: 707
dv: Replace a magic number by sizeof()
hevc: Allow out of bound values for num_reorder_pics

This fixes decoding for a sample that cannot be shared

Signed-off-by: Anton Khirnov <anton@khirnov.net>
hevc: remove unused array min_cb_addr_zs

Signed-off-by: Anton Khirnov <anton@khirnov.net>
lavc: do not allocate edges in the default get_buffer2()
dump_stream: print the timebase as is, do not reduce it

It makes more sense to print the timebase exactly as it is set. Also,
this avoids a divide by zero when av_dump_format() is called on a format
context before writing the header.
output example: use the new AVFrame API for allocating the video frame
output example: use a struct to bundle the video stream variables together
output example: set output channel layout
output example: use the new AVFrame API to allocate audio frames
output example: use OutputStream for audio streams as well
output example: allocate the audio frame only once
output example: use a macro instead of a static variable
output example: store the scaling context in the stream context