Removes an ugly $(if) to avoid conflicts with $(FFLIBS-) in the
top-level MAkefile.

This fixes compilation with MSVC.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Add AV_PKT_DATA_DISPLAYMATRIX and AV_FRAME_DATA_DISPLAYMATRIX as stream and
frame side data (respectively) to describe a display transformation matrix
for linear transformation operations on the decoded video.

Add functions to easily extract a rotation angle from a matrix and
conversely to setup a matrix for a given rotation angle.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

This also handles side data properly.

Side data count is incremented by by calling av_packet_new_side_data()
in the following loop, setting it explicitly results in the resulting
value being twice what it should be.

CC: libav-stable@libav.org

All encoders should output proper timestamps now.

Use OutputStream.last_mux_dts as an approximation of 'current' output
time instead.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Process 4 pixels at once.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

This mirrors the demuxer behaviour and avoids accessing
AVCodecContext.codec, which should not be done in muxers.

Also, return a proper error code.

It is not supposed to be set from outside of libavcodec.
Set average framerate instead.

Do not call an AVCodecContext 'stream', that is highly confusing.
Also, add a local variable for the current AVStream in the loop over all
streams.

Do not leave a non-zero extradata_size set on failure

coded_frame is not meant to be changed from outside of lavc, and is not
used for decoding.
Set AVCodecContext.field_order instead.

Pad it with the required amount of zeros, check for malloc failure.

Right now, the caller has to manually manage some allocated
AVCodecContext fields, like extradata or subtitle_header. This is
fragile and prone to leaks, especially if we want to add more such
fields in the future.

The only reason for this behaviour is so that the AVStream codec context
can be reused for decoding. Such reuse is discouraged anyway, so this
commit is the first step to deprecating it.

This function should not modify any global state, so there should be no
reason for any locking.

Fix incorrect wSamplesPerBlock(=0) written for ADPCM_IMA_WAV
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Most HLS implementation only support these codecs.
Signed-off-by: Martin Storsjö <martin@martin.st>

Clang Undefined Behaviour Sanitizer seems to make non-constant constant
expressions, making the compilation fail when they are used within
inline assembly if no optimization is requested.

Add -O1 to the cflags to hide the misbehaviour.

Bug-Id: 683

Signed-off-by: Anton Khirnov <anton@khirnov.net>

This seems to be needed on some 32bit arches.

Opus celt decoding 11% faster and the iMDCT over 2.5 times faster on
Apple's A7.

avcodec might depend on avresample and with --as-needed required symbols
might be get removed if avresample is linked before avcodec.
Fixes link failures of avprobe and avplay on aarch64 with
--enable-neon-clobber-test.