pthread: Fix deadlock during thread initialization

Sometimes, if pthread_create() failed, then pthread_cond_wait() could
accidentally be called in the worker threads after the uninit function
had already called pthread_cond_broadcast(), leading to a deadlock.

Don't call pthread_cond_wait() if c->done is set.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
pthread: Avoid spurious wakeups

pthread_wait_cond can wake up unexpectedly (Wikipedia: Spurious_wakeup).

The FF_THREAD_SLICE thread mechanism could spontaneously execute
jobs or allow the caller of avctx->execute to return before all
jobs were complete.

Test both cases to ensure the wakeup is real.

Signed-off-by: Ben Jackson <ben@ben.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
x86: ac3dsp: Remove 3dnow version of ff_ac3_extract_exponents

The function requires increasing the fuzz factor for the ac3/eac3 encode
tests and even so makes fate fail. It only provides a slight encoding
speedup for legacy CPUs that do not support SSE2. Thus its benefit is not
worth the trouble it creates and fixing it would be a waste of time.
mpeg4videodec: split initializing static tables into a separate function

Signed-off-by: Anton Khirnov <anton@khirnov.net>
mpeg4video_parser: init mpeg4 static tables.

They are used when decoding the frame header.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org

Signed-off-by: Anton Khirnov <anton@khirnov.net>
h264/mpegvideo: do not provide pixel formats for hwaccels that are not compiled in
alsdec: check block length

Fix writing over the end

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Addresses: CVE-2013-0845
(cherry picked from commit 2a0fb7286d67c47e44aa76c237ede117b22af616)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
arm: Don't clobber callee saved registers in scalarproduct

q4-q7/d8-d15 are supposed to not be clobbered by the callee.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit d307e408d4a9ada22df443cc38be77cc5e492694)

Signed-off-by: Martin Storsjö <martin@martin.st>
avfilter/ff_insert_pad: fix order of operations

Fixes out of bounds access
Fixes CID732170
Fixes CID732169

No filter is known to use this function in a way so the issue can be reproduced.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit ab2bfb85d49b2f8aa505816f93e75fd18ad0a361)

Conflicts:

	libavfilter/avfilter.c
(cherry picked from commit 86591b244f3a27293153896813f5569b49b2f5c0)

Conflicts:

	libavfilter/avfilter.c
(cherry picked from commit 400c4f8fa3fd58951dc3f356b2b00484e3363694)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '1a5a6ac01b0ad2cf3d2128372ea41f3c1cfc2d3f' into release/1.1

* commit '1a5a6ac01b0ad2cf3d2128372ea41f3c1cfc2d3f':
  pthread: Fix deadlock during thread initialization

Conflicts:
	libavcodec/pthread.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '56eded8bc7bccdf14245bae3a45b0fecf9d9d122' into release/1.1

* commit '56eded8bc7bccdf14245bae3a45b0fecf9d9d122':
  mpeg4videodec: split initializing static tables into a separate function
  x86: ac3dsp: Remove 3dnow version of ff_ac3_extract_exponents
  pthread: Avoid spurious wakeups

Conflicts:
	libavcodec/mpeg4videodec.c
	tests/fate/ac3.mak

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/release/9' into release/1.1

* qatar/release/9:
  arm: Don't clobber callee saved registers in scalarproduct
  alsdec: check block length
  h264/mpegvideo: do not provide pixel formats for hwaccels that are not compiled in
  mpeg4video_parser: init mpeg4 static tables.

Conflicts:
	libavcodec/mpeg4video_parser.c
	libavcodec/mpeg4videodec.c

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