build: The MPEG-4 video parser depends on h263dsp

The dependency is indirect through the h263/mpegvideo code.
CC: libav-stable@libav.org
svq3: Adjust #endif comment
bit_depth_template: Use file name as multiple inclusion guard
x86: dsputil: Use correct file name as multiple inclusion guard
avcodec: Consistently name encoder init functions foo_encode_init
mpeg4video_parser: Drop pointless av_-prefix from static function
h264: avoid undefined behavior in chroma motion compensation

Makes fate-h264 pass under valgrind --undef-value-errors=yes with
-cpuflags none. {avg,put}_h264_chroma_mc8_8 approximately 5% faster,
{avg,put}_h264_chroma_mc4_8 2% faster both on x86 and arm.
dca: replace some memcpy by AV_COPY128

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
x86: float dsp: unroll SSE versions

vector_fmul and vector_fmac_scalar are guaranteed that they can process in
batch of 16 elements, but their SSE versions only does 8 at a time.

Therefore, unroll them a bit.
299 to 261c for 256 elements in vector_fmac_scalar on Arrandale/Win64.

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
aarch64: use EXTERN_ASM consistently for exported symbols

Based on e3fec3f095ab5ea08ee662942d98526aaf5e3635 for arm.
configure: Move inet_aton check into network function check block
configure: Move cpunop into ARCH_EXT_LIST_X86

It is a processor feature, so it belongs there.
configure: Add usan to the toolchain presets

clang-3.4 and gcc-4.9 have it.
avconv: Do not divide by zero
h264: Lower bound check for slice offsets

And use the value from the specification.

Sample-Id: 00000451-google
Found-by: Mateusz j00ru Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
libvorbis: Give consistent names to all functions, structs, and defines
mxf: Add uncompressed 422 8-bit rawvideo UL

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
mxf: Add DNxHD UL

Note that the old DNxHD UL is actually JPEG 2000 according to RP224.
Leaving it as-is for now.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>