The QuickTime File Format Specification states the following:

"Depth: A 16-bit integer that indicates the pixel depth of the
compressed image. Values of 1, 2, 4, 8 ,16, 24, and 32 indicate the
depth of color images. The value 32 should be used only if the image
contains an alpha channel. Values of 34, 36, and 40 indicate 2-, 4-, and
8-bit grayscale, respectively, for grayscale images."

There is no mention of value 33, i.e. 1-bit video (0x01) with the
greyscale bit (0x20) set. I therefore suggest that we ignore the
greyscale bit when processing 1-bit video. Another reason to do this is
that the first 1-bit sample file below will be displayed properly with
blue colors in QuickTime in Windows or Mac *in spite of* the greyscale
bit being set.

Also, QuickTime in Windows or Mac ignores the greyscale bit if the
video sample description contains a palette, regardless of bit depth.
This is undocumented behaviour, but I think we should do the same, and
it seems pretty logical after all, since one wouldn't really bother
putting a customized palette into a grayscale file anyway. See the
second 8-bit sample file below, which has the greyscale bit set, and
which contains a palette in the video sample description. In Windows or
Mac, it will be displayed with the palette in the sample description, in
spite of the greyscale bit being set.

Sample file 1 (1-bit QuickTime Animation):
https://drive.google.com/open?id=0B3_pEBoLs0faTThSek1EeXQ0ZHM
Earth Spin 1-bit qtrle orig.mov

Sample file 2 (8-bit QuickTime Animation):
https://drive.google.com/open?id=0B3_pEBoLs0fad2s0V1YzUWo5aDA
quiz-palette+gs.mov
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This commit fixes the lack of palettized display of 1-bit video
in the qtrle decoder. It is related to my commit of
lavf/qtpalette, which added 1-bit video to the "palettized video"
category. As far as I can see, everything works fine, but comments are
of course welcome.

Below are links to sample files, which should now be displayed properly
with bluish colors, but which were previously displayed in black &
white.

Matroska:
https://drive.google.com/open?id=0B3_pEBoLs0faNjI0cHBMWDhYY2c
Earth Spin 1-bit qtrle.mkv

QuickTime (mov):
https://drive.google.com/open?id=0B3_pEBoLs0faUlItWm9KaGJSTEE
Earth Spin 1-bit qtrle.mov
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This fixes a regression of the sample from Ticket 2371
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

It causes the angle channel number to equal the magnitude channel
number, which makes the stream undecodable according to the
specification.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

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

Rationale: supports >16 bit audio, more than 96dB SNR.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes ticket #4792.

This fixes segmentation faults caused by passing a packet_ptr of NULL to
memcpy.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

This can be used to simplify code in a couple of places.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

This preempts potential bugs if this is changed and the indention
ends up different from C interpretation
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This is a waste of computing power and will result to 0,
making it always dropped.
Use maximum difference values instead.

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

This fixes ubsan runtime error: left shift by 8 places cannot be
represented in type 'int'
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

This causes a overall slowdown of 0.1 % (tested with mpeg4 single thread encoding of matrixbench at QP=3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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>

* commit '40d94967':
  dca: use defines for subband related constants
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '8563f988':
  x86: use emms after ff_int32_to_float_fmul_scalar_sse
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'f0f54117':
  checkasm: x86: post commit review fixes
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'f4f27e4c':
  x86: zero extend the 32-bit length in int32_to_float_fmul_scalar implicitly
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '69a68593':
  Remove stray line breaks from avpriv_{report_missing_feature|request_samples}
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '5049f6b7':
  rtpdec_jpeg: Coalesce redundant error checks
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '2008f760':
  dca: remove unused decode_hf function and quant_d tables
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'aebf0707':
  dca: change the core to work with integer coefficients.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '85990140':
  dca: Add math helpers.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '489e6add':
  checkasm: add fmtconvert tests
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '568a4323':
  checkasm: add synth_filter test
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'e71b747e':
  checkasm: add tests for dcadsp
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '9d218d57':
  checkasm: add float comparison util functions
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>