* commit '701e8b42':
  vc-1: Optimise parser (with special attention to ARM)

Conflicts:
	libavcodec/vc1_parser.c

See: a0d7f9ecMerged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'adf8227c':
  vc-1: Add platform-specific start code search routine to VC1DSPContext.

Conflicts:
	configure
	libavcodec/arm/vc1dsp_init_arm.c
	libavcodec/vc1dsp.c
	libavcodec/vc1dsp.h

See: 9d8ecdd8Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'db7f1c7c':
  h264: Move start code search functions into separate source files.

Conflicts:
	libavcodec/arm/Makefile
	libavcodec/arm/h264dsp_init_arm.c
	libavcodec/h264_parser.c
	libavcodec/h264dsp.c
	libavcodec/startcode.c
	libavcodec/startcode.h

See: 270cede3Merged-by: Michael Niedermayer <michaelni@gmx.at>

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

After the removal of all Blackfin architecture optimizations in
http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b55d3bbeed375f7b74442c4dd274d116a3e3d2e1
some includes were left behind leading to a compile error:

CC      libavformat/adtsenc.o
In file included from ./libavcodec/get_bits.h:35,
                 from ./libavcodec/ac3_parser.h:27,
                 from libavformat/ac3dec.c:23:
./libavcodec/mathops.h:43:29: error: bfin/mathops.h: No such file or directory

This compile error was found by buildroot autobuild system:
http://autobuild.buildroot.net/results/ae0/ae056f267e907091d09d2a1546d6f1ae02fa23b9/Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket644
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

* commit 'eee813ee':
  fate: Only generate tests/pixfmts.mak if some pixfmts fate test is run
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '990e2f35':
  avcodec: Suppress deprecation warnings from DTG code scheduled for removal
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '086a5418':
  fate: png-suite

Conflicts:
	tests/fate/image.mak
Merged-by: Michael Niedermayer <michaelni@gmx.at>

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

* commit '60cbd6ad':
  tiff: support reading gray+alpha at 8 bits

Conflicts:
	libavcodec/tiff.c

See: f746f379Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'bcc5f69b':
  tiff: support reading gray+alpha at 16 bits

Conflicts:
	libavcodec/tiff.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e64f0bf2':
  png: support reading gray+alpha at 16 bits
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '2257165b':
  png: disable broken MMX/SIMD code for bpp <= 2

See: d1c48025Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'f84a1b59':
  swscale: support AV_PIX_FMT_YA16 as input

Conflicts:
	libswscale/swscale_unscaled.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

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 avconv
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: Luca Barbato <lu_zero@gentoo.org>

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: Luca Barbato <lu_zero@gentoo.org>

This permits re-use with parsers for codecs which use similar start codes.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

* commit 'e9abafca':
  avutil: add AV_PIX_FMT_YA16 pixel format

Conflicts:
	libavutil/pixdesc.c
	libavutil/pixfmt.h
	libavutil/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e96c3b81':
  avutil: rename AV_PIX_FMT_Y400A to AV_PIX_FMT_YA8

Conflicts:
	libavcodec/libopenjpegdec.c
	libavcodec/libopenjpegenc.c
	libavcodec/raw.c
	libavutil/pixdesc.c
	libavutil/pixfmt.h
	libavutil/version.h
	libswscale/swscale_internal.h
	libswscale/swscale_unscaled.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e0d73fda':
  avutil: add alias names for gray 8/16 colour spaces
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'd2962e9f':
  pixdesc: Support pixelformat aliases

Conflicts:
	doc/APIchanges
	libavutil/pixdesc.c
	libavutil/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '5420099c':
  swscale: correctly pad destination buffer in rgb conversion
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Disfavor video streams with unknown resolution and no packets
Fixes seeking in audio-only-speex.flv
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The unpacks/shuffles later on makes it unnecessary.

Before:
1508 decicycles in h, 2096759 runs, 393 skips
2512 decicycles in v, 2095422 runs, 1730 skips

After:
1477 decicycles in h, 2096745 runs, 407 skips
2484 decicycles in v, 2095297 runs, 1855 skips
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: Christophe Gisquet <christophe.gisquet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: Mickaël Raulet <mraulet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* commit '23dfa00b':
  fate: explicitly set the default THREADS value

Conflicts:
	tests/Makefile
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'eb9244f2':
  Add Icecast protocol

Conflicts:
	Changelog
	configure
	doc/protocols.texi
	libavformat/icecast.c
	libavformat/version.h

See: e3dc2c86Merged-by: Michael Niedermayer <michaelni@gmx.at>

Every supported format is converted to RGB.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

The decoder was producing different results when ASM was disabled.
Based on a long debug session with Kostya.

Based on a long debug session with Kostya.

The rationale is that you have a packed format in form
<greyscale sample> <alpha sample> <greyscale sample> <alpha sample>
and shortening greyscale to 'G' might make one thing about Greenscale instead.
An alias pixel format and color space name are provided for compatibility.