Improve consistency/readability.

Avoid one dereference, simplify.

Fix crash, for example in the command:
ffmpeg -f image2 -vcodec pgmyuv -i tests/vsynth1/%02d.pgm \
  -vf "[in]format=yuv420p,split,alphamerge,split[o3][o4];
       [o4]vflip,alphaextract[alpha];[o3][alpha]alphamerge[out]" \
  -vcodec rawvideo -f nut md5:

The code causes uninitialized data copy, and may be actually slower than
a loop over each line in case the padding is big.

Such packets are useless.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

* qatar/master:
  h264: add a pointer for weighted prediction temporary buffer

Conflicts:
	libavcodec/h264.c
	libavcodec/h264.h

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

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Clément Bœsch <ubitux@gmail.com>

Merge get_scale/get_shift into set_sample_rate_params().
Rename tak_set_bps to set_bps_params and remove 2nd argument.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

* commit 'd7d6efe42b0d2057e67999b96b9a391f533d2333':
  h264: check sps.log2_max_frame_num for validity
  mov: validate number of DataReferenceBox entries against box size
  mov: compute avg_frame_rate only if duration is known
  flac: change minimum and default of lpc_passes option to 1

Conflicts:
	libavcodec/h264_ps.c
	libavformat/mov.c

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

* commit 'c25fc5c2bb6ae8c93541c9427df3e47206d95152':
  fate: dpcm: Add dependencies
  SBR DSP x86: implement SSE sbr_hf_gen
  AAC SBR: use AVFloatDSPContext's vector_fmul
  fate: image: Add dependencies
  Changelog: add an entry for deprecating the avconv -vol option
  x86: float_dsp: fix compilation of ff_vector_dmul_scalar_avx() on x86-32

Conflicts:
	Changelog
	libavutil/x86/float_dsp.asm
	tests/fate/image.mak

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

Inspired by 92b8c9d89e.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes out of array reads

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reusing MpegEncContext's obmc_scratchpad for this becomes a mess with
adaptive frame-mt.

Fixes infinite or long taking loop in frame num gap code in
the fuzzed sample bipbop234.ts_s223302.

CC: libav-stable@libav.org

Avoids a 2G memory allocation and parsing of random data in
mov_read_dref(). The fuzzed sample sample.mp4_s224424 triggers this.

Fixes an assert in fuzzed sample sample.mp4_s265930.

Avoid use of uninitialized and uncomputed linear least square models
during ff_lpc_calc_coefs() for FF_LPC_TYPE_CHOLESKY. Fixes running
make fate-flac-16-lpc-cholesk with valgrind --undef-value-errors=yes.

Start and end index are multiple of 2, therefore guaranteeing aligned access.
Also, this allows to generate 4 floats per loop, keeping the alignment all
along.

Timing:
- 32 bits: 326c -> 172c
- 64 bits: 323c -> 156c

Signed-off-by: Diego Biurrun <diego@biurrun.de>

Around 5% speedup on the code block using 'vector_fmul_add's.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

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

Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Instead of having own code for calculating decoded buffer size
just use already provided functions from libavutil.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

As found by Justin, this is probably bug in reference decoder.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

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

Simplify code, and provide introspection through the AVOption system.

Also add missing NULL checks.

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

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

Protects against overreads in input buffer.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

* qatar/master:
  h264: slice-mt: check master context for valid current_picture_ptr
  h264: slice-mt: get last_pic_dropable from master context
  alacenc: add support for multi-channel encoding

Conflicts:
	Changelog
	libavcodec/alac.c

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