also check pbuffer before use

Found-by: CSA
Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: CSA
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

DTS primarly needs to be separated from PCM, and PCM can contain cliping and
overshoots at the very start which can mimic DTS headers.

If this isnt sufficient then more of the DTS stream has to be decoded
and analyzed

Fixes ticket3784

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

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

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

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

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

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

* commit 'f0e95948':
  af_channelmap: Set the frame channel layout

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

* commit '87efaa97':
  af_join: Set the output frame format

See: e0dd8cad
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fixes null pointer dereference
Fixes Ticket3812

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

Fixes part of Ticket2236

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

Fixes part of ticket2236

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

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

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

Otherwise the frame would show the first layout matching the
channel count.

Fixes a infinite loop
Fixes Ticket3804

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

* commit 'fa14804c':
  flv: Index the audio stream

Conflicts:
	libavformat/flvdec.c

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

Fixes Ticket3809

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

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

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

* commit '7ab551f9':
  h264: prevent theoretical infinite loop in SEI parsing

Conflicts:
	libavcodec/h264_sei.c

Not merged, as this would remove 2 bitstream compliance checks.
The specification does not allow the bitstream to end in the middle
of these variable length elements and we have no samples which
have such non compliant truncation either so its better to error
out. Which is simpler as well

This issue also has been fixed long ago
See: 9decfc17

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

* commit 'b2e059a1':
  pixdesc: K&R formatting cosmetics

Conflicts:
	libavutil/pixdesc.c
	libavutil/pixdesc.h

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

* commit '92a36a6b':
  pngdec: correctly indent macros

Conflicts:
	libavcodec/pngdec.c

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

* commit '52269f48':
  Revert "vf_interlace: deprecate lowpass option"

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

* commit '4da8cdbb':
  tscc: Eliminate pointless variable indirections in decode_frame()

Conflicts:
	libavcodec/tscc.c

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

* commit '5735552f':
  pngenc: Drop pointless pointer cast in png_write_row()

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

* commit 'a786c825':
  idct: Split off Xvid IDCT

Conflicts:
	libavcodec/Makefile
	libavcodec/mpeg4videodec.c
	libavcodec/x86/Makefile
	libavcodec/x86/idctdsp_init.c

This split is somewhat restructured leaving the xvid IDCT available
outside mpeg4 if manually selected.

The code also could not be merged unchanged as it conflicted with a
bugfix in FFmpeg

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

* commit '03c9f357':
  ppc: idctdsp: Immediately return if no AltiVec is available

Conflicts:
	libavcodec/ppc/idctdsp.c

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

And leverage the video index if the video is just disabled as wm4
did in an initial patch.

* commit '706208ef':
  fate: Split fate-pixdesc tests and dispatch them through Make

Conflicts:
	tests/fate-run.sh
	tests/ref/fate/filter-pixdesc

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

The first try failed to work with some build flags

The gcc version affected is very old and unmaintained AFAIK thus i made no
attempt to report this to the gcc developers.

The workaround is pushed as it may still affect users and does affect one
fate client

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

Properly address CVE-2011-3946 and parse bitstream as described in the spec.

CC: libav-stable@libav.org
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind

Also change some comments to multiline.

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

This reverts commit 35b05c51.
A warning is introduced in case this option is used.