Fixes null pointer dereference

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

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:
  lavr: fix mixing matrix reduction when normalization is disabled
  lavr: fix matrix reduction for upmixing in certain cases
  lavr: cosmetics: reindent

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

* commit '1647da89dd8ac09a55c111589f7a30d7e6b87d90':
  lavr: make sure that the mix function is reset even if no mixing will be done
  lavr: print out the mix matrix in ff_audio_mix_set_matrix()
  ws-snd1: decode directly to the user-provided AVFrame
  wmavoice: decode directly to the user-provided AVFrame

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

* commit '205a95f7b5178362874bc1e65eae9866723491c1':
  wmaenc: alloc/free coded_frame instead of keeping it in the WMACodecContext
  wma: decode directly to the user-provided AVFrame
  wmapro: decode directly to the user-provided AVFrame
  wavpack: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/wavpack.c

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

* commit 'ee6ca11b657515ad736ec0d2b8635e098d0a2680':
  vorbis: decode directly to the user-provided AVFrame
  vmdaudio: decode directly to the user-provided AVFrame
  twinvq: decode directly to the user-provided AVFrame
  tta: decode directly to the user-provided AVFrame
  truespeech: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/tta.c
	libavcodec/twinvq.c

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

* commit '4a2b26fc1b1ad123eba473a20e270f2b0ba92bca':
  tak: decode directly to the user-provided AVFrame
  smackaud: decode directly to the user-provided AVFrame
  sipr: decode directly to the user-provided AVFrame
  shorten: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/shorten.c
	libavcodec/takdec.c

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

* commit '5d5c248c3df30fa91a8dde639618c985b9a11c53':
  s302m: decode directly to the user-provided AVFrame
  ra288: decode directly to the user-provided AVFrame
  ra144: decode directly to the user-provided AVFrame
  ralf: decode directly to the user-provided AVFrame
  qdm2: decode directly to the user-provided AVFrame

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

* commit '1b9b6d6e5ea556b6d307f9d473f54f6406fdc3c8':
  qcelp: decode directly to the user-provided AVFrame
  pcm-bluray: decode directly to the user-provided AVFrame
  nellymoser: decode directly to the user-provided AVFrame
  mpc7/8: decode directly to the user-provided AVFrame
  mpegaudio: decode directly to the user-provided AVFrame
  mlp/truehd: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/mpc7.c

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

* commit '86bfcfcf2364bc837b7bb582c66a8a15a332414f':
  mace: decode directly to the user-provided AVFrame
  libspeex: decode directly to the user-provided AVFrame
  libopus: decode directly to the user-provided AVFrame
  libopencore-amr: decode directly to the user-provided AVFrame
  libgsm: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/libopusdec.c
	libavcodec/mace.c

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

* commit 'a8ea936a0a00570f61a16a588821b52f6a3115c2':
  libilbc: decode directly to the user-provided AVFrame
  dpcm: decode directly to the user-provided AVFrame
  imc/iac: decode directly to the user-provided AVFrame
  gsm: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/dpcm.c

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

* commit 'cb7b47a61dba0b9329ecede5dd3211dc0662dc05':
  g726: decode directly to the user-provided AVFrame
  g723.1: decode directly to the user-provided AVFrame
  g722: decode directly to the user-provided AVFrame
  flac: decode directly to the user-provided AVFrame
  cinaudio: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/g723_1.c

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

* commit '182821cff43f5f977004d105b86c47ceb20d00d6':
  dca: decode directly to the user-provided AVFrame
  cook: decode directly to the user-provided AVFrame
  comfortnoise: decode directly to the user-provided AVFrame
  bmvaudio: decode directly to the user-provided AVFrame
  pcm: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/pcm.c

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

* commit '5cc0bd2cb47cbb1040f2bb0ded8d72a442c79b20':
  binkaudio: decode directly to the user-provided AVFrame
  atrac3: decode directly to the user-provided AVFrame
  atrac1: decode directly to the user-provided AVFrame
  ape: decode directly to the user-provided AVFrame
  amrwb: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/amrwbdec.c

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

* commit 'e3db34291f4401a16f6ac92721617a9f33cd4c31':
  amrnb: decode directly to the user-provided AVFrame
  als: decode directly to the user-provided AVFrame
  alac: decode directly to the user-provided AVFrame
  adxenc: alloc/free coded_frame instead of keeping it in the ADXContext
  adx: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/alsdec.c
	libavcodec/amrnbdec.c

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

* commit 'e57daa876bf0cf50782550e366e589441cd8c2bd':
  adpcm: decode directly to the user-provided AVFrame
  ac3: decode directly to the user-provided AVFrame
  aac: decode directly to the user-provided AVFrame
  8svx: decode directly to the user-provided AVFrame

Conflicts:
	libavcodec/8svx.c
	libavcodec/ac3dec.c
	libavcodec/adpcm.c

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

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

Fixes freeing invalid addresses

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

Fixes out of array accesses

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

Fixes reading over the end

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>

In some cases when an input contributes fully to the corresponding
output, other inputs may also contribute to the same output. This is the
case, for example, for the default 5.1 to stereo downmix matrix without
normalization.

Do not skip an output if the corresponding input contributes to other output
channels.

If the matrix reduction ends up with no mixing matrix needed, we need to still
reset the mix function accordingly and log the info to the user.

This will print the new matrix if it is set after initialization.