flv: Improve log messages

Messages should start with a capital letter and possibly end with a "."
if they are statements.
flv: Warn only once

No point in sending the message multiple time.
flv: Do not mangle dts values for negative cts

Some applications really mean to send negative pts.
lavu: add CHK_OFFS as AV_CHECK_OFFSET to check struct member offsets
lavr: define ResampleContext in resample.h

Required for arch optimized resampling.
aarch64: NEON optimized FIR audio resampling

Optimized for the default filter length 16.

30% faster opus silk decoding.
Merge commit '374fdc8c071dcd96422378b0a1a0d453336d8a01'

* commit '374fdc8c071dcd96422378b0a1a0d453336d8a01':
  flv: Improve log messages

Conflicts:
	libavformat/flvdec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '5d983fdbca5570a1545a892583a372cfb3fffe92'

* commit '5d983fdbca5570a1545a892583a372cfb3fffe92':
  flv: Warn only once

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '152b797cd687e96a582a1cb908dddf3d330d7637'

* commit '152b797cd687e96a582a1cb908dddf3d330d7637':
  flv: Do not mangle dts values for negative cts

Merged-by: Michael Niedermayer <michaelni@gmx.at>
fate: Add fic-in-avi test

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
fate: Add fic-in-avi test

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
x86/mpegaudiodsp: define apply_window_mp3 as SSE

None of the handwritten asm in this function seems to be SSE2

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'a88e1d1c598e641eecd5d43730211d91c82787c6'

* commit 'a88e1d1c598e641eecd5d43730211d91c82787c6':
  lavu: add CHK_OFFS as AV_CHECK_OFFSET to check struct member offsets

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'cae8df78759c2e69257f7fe58842f34c0d98a7ec'

* commit 'cae8df78759c2e69257f7fe58842f34c0d98a7ec':
  lavr: define ResampleContext in resample.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'a24a252709dd38f12aa4929ce4981f87091a5113'

* commit 'a24a252709dd38f12aa4929ce4981f87091a5113':
  aarch64: NEON optimized FIR audio resampling

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '8de77b665d2a2f1cd560d2183fd4664298b30715'

* commit '8de77b665d2a2f1cd560d2183fd4664298b30715':
  fate: Add fic-in-avi test

Conflicts:
	tests/ref/fate/fic-avi

See: d66de5006bbcfc8dd875b9385ec3552d1f9fcd6b
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Enable muxing ac-3 in caf.
  Use correct msvc type specifiers for ptrdiff_t and size_t.
  Fix vf_eq.c and vf_eq2.c compilation with !HAVE_6REGS.
  Fix libpostproc compilation with !HAVE_6REGS.
  Never write 0 as maximum bitrate for asf files.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
h264: Move search code search functions into separate source files.

This permits re-use with parsers for codecs which use similar start codes.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
vc-1: Add platform-specific start code search routine to VC1DSPContext.

Initialise VC1DSPContext for parser as well as for decoder.
Note, the VC-1 code doesn't actually use the function pointer yet.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
vc-1: Optimise parser (with special attention to ARM)

The previous implementation of the parser made four passes over each input
buffer (reduced to two if the container format already guaranteed the input
buffer corresponded to frames, such as with MKV). But these buffers are
often 200K in size, certainly enough to flush the data out of L1 cache, and
for many CPUs, all the way out to main memory. The passes were:

1) locate frame boundaries (not needed for MKV etc)
2) copy the data into a contiguous block (not needed for MKV etc)
3) locate the start codes within each frame
4) unescape the data between start codes

After this, the unescaped data was parsed to extract certain header fields,
but because the unescape operation was so large, this was usually also
effectively operating on uncached memory. Most of the unescaped data was
simply thrown away and never processed further. Only step 2 - because it
used memcpy - was using prefetch, making things even worse.

This patch reorganises these steps so that, aside from the copying, the
operations are performed in parallel, maximising cache utilisation. No more
than the worst-case number of bytes needed for header parsing is unescaped.
Most of the data is, in practice, only read in order to search for a start
code, for which optimised implementations already existed in the H264 codec
(notably the ARM version uses prefetch, so we end up doing both remaining
passes at maximum speed). For MKV files, we know when we've found the last
start code of interest in a given frame, so we are able to avoid doing even
that one remaining pass for most of the buffer.

In some use-cases (such as the Raspberry Pi) video decode is handled by the
GPU, but the entire elementary stream is still fed through the parser to
pick out certain elements of the header which are necessary to manage the
decode process. As you might expect, in these cases, the performance of the
parser is significant.

To measure parser performance, I used the same VC-1 elementary stream in
either an MPEG-2 transport stream or a MKV file, and fed it through ffmpeg
with -c:v copy -c:a copy -f null. These are the gperftools counts for
those streams, both filtered to only include vc1_parse() and its callees,
and unfiltered (to include the whole binary). Lower numbers are better:

                Before          After
File  Filtered  Mean   StdDev   Mean   StdDev  Confidence  Change
M2TS  No        861.7  8.2      650.5  8.1     100.0%      +32.5%
MKV   No        868.9  7.4      731.7  9.0     100.0%      +18.8%
M2TS  Yes       250.0  11.2     27.2   3.4     100.0%      +817.9%
MKV   Yes       149.0  12.8     1.7    0.8     100.0%      +8526.3%

Yes, that last case shows vc1_parse() running 86 times faster! The M2TS
case does show a larger absolute improvement though, since it was worse
to begin with.

This patch has been tested with the FATE suite (albeit on x86 for speed).

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>