The AVBPrint API guarantees that the string buffer is always
zero-terminated; in order to honour this guarantee, there
obviously must be a string buffer at all and it must have
a size >= 1. Therefore av_bprint_init_for_buffer() treats
passing a NULL buffer or size == 0 as invalid data that
leads to undefined behaviour, namely NPD in case NULL is provided
or a write to a buffer of size 0 in case size == 0.

But it would be easy to support this, namely by using the internal
buffer with AV_BPRINT_SIZE_COUNT_ONLY in case size == 0.

There is a reason to allow this: Several functions like
av_channel_(description|name) are actually wrappers
around corresponding AVBPrint functions. They accept user
provided buffers and are supposed to return the required
size of the buffer, which would allow the user to call
it once to get the required buffer size and call it once
more after having allocated the buffer.
If av_bprint_init_for_buffer() treats size == 0 as invalid,
all these users would need to check for this themselves
and basically add the same codeblock that this patch
adds to av_bprint_init_for_buffer().

This change is in line with e.g. snprintf() which also allows
the pointer to be NULL in case size is zero.

This fixes Coverity issues #1503074, #1503076 and #1503082;
all of these issues are about providing NULL to the channel-layout
functions that are wrappers around AVBPrint versions.
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

The demuxer uses a extradata offset of 26, so we would need
to recreate the missing 26 bytes somehow in the muxer, but
we just don't. Remuxed files (like real/rv30.rm from the FATE-suite)
don't work due to missing extradata.

(The extradata offset also applies to RV40 and the extradata
is indeed lost upon remuxing, yet remuxing real/spygames-2MB.rmvb
works; our RV40 decoder does not use extradata at all.)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

RV10 and RV20 are unsupported because creating the correct CodecPrivate
is unsupported (the demuxer uses a codecpriv_offset of 26, so one
would need to recreate the missing 26 bytes); COOK and SIPR are
unsupported, because Matroska uses a packetization mode that is
different from what FFmpeg uses in its packets (see
matroska_parse_rm_audio() in the demuxer).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Provides coverage for the code transforming the ALAC extradata.
Also set creation_time metadata to test this, too.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

bda44f0f added code that
potentially added another BlockMore master and BlockAdditional
data as well as BlockAddID number, yet it bumped the number
of EBML elements by four instead of only three.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Matroska supports orthogonal transformations (both pure rotations
as well as reflections) via its 3D-projection elements, namely
ProjectionPoseYaw (for a horizontal reflection) as well as
ProjectionPoseRoll (for rotations). This commit adds support
for this.

Support for this in the demuxer has been added in
937bb6bb and
the sample used in the matroska-dovi-write-config8 FATE-test
includes a displaymatrix indicating a rotation which is now
properly written and read, thereby providing coverage for
the relevant code in the muxer as well as the demuxer.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Note: There is a slight difference in the handling of
the max_file_size option: The earlier code used it to mean
to limit the size of the buffer to allocate; the new code
treats it more literally as maximum size to read from
the input.
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

This is a bit cleaner as int need not be the underlying type
of an enum if a smaller type can hold all its values.
Also declare the children_ids array as const as it never changes.
Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Also rename the contexts and the functions so their names will reflect their
intended size.

With the earlier patch this fixes the audio corruption regression caused by
6ba0aa17.

Fixes ticket #10029.
Signed-off-by: Marton Balint <cus@passwd.hu>

Improves the audio corruption regression caused by
6ba0aa17 reported in ticket #10029.

There is still however a noticable audio glitch, so the FFT conversion to AVTX
probably also needs some modifications.
Signed-off-by: Marton Balint <cus@passwd.hu>

Move some code out of inner loop.

This patch changes the return instruction in the tr_32x4 macro from
BR to RET.

Function returns should always use the RET instruction instead of BR,
to avoid interfering with branch prediction.

On devices that support BTI, this is observeable as a landing pad is
required when branching with BR. The change fixes
fate-hevc-hdr-vivid-metadata when on hardware with BTI support.
Signed-off-by: Casey Smalley <casey.smalley@arm.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

Pass the information about unchanged parts of the frame by means of
the AVVideoHint side data.

Add side data type to provide hint to the video encoders about
unchanged portions of each frame.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

The Vulkan spec wants ScalingList8x8 as defined by ITU spec, which is in
a different order from how ffmpeg parses it.

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

This commit is the AVHWAccel analogue of commit
20f97270: It moves the private fields
of AVHWAccel to a new struct FFHWAccel extending AVHWAccel
in an internal header (namely hwaccel_internal.h).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

All usages of ff_hwaccel_frame_priv_alloc() have the same pattern:
Check for whether a hwaccel is in use; check whether it needs
private frame-specific data; allocate the AVBuffer and set
it.

This commit modifies ff_hwaccel_frame_priv_alloc() to perform
this task on its own.

(It also seems that the H.264 decoder did not perform proper
cleanup in case the buffer could not be allocated. This has been
changed.)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/hwconfig.h currently contains HWACCEL_CAP_* flags
as well as the definition of AVCodecHWConfigInternal and some
macros to create them.

The users of these two are nearly disjoint: The flags are used
by files providing AVHWAccels whereas AVCodecHWConfigInternal
is used by files providing codecs (for FFCodec.hw_configs).

This patch therefore moves these flags to a new file hwaccel_internal.h.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

While just at it, also improve the other headers a bit.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

A filter needs formats.h iff it uses FILTER_QUERY_FUNC();
since lots of filters have been switched to use something
else than FILTER_QUERY_FUNC, they don't need it any more,
but removing this header has been forgotten.
This commit does this; files with formats.h inclusion went down
from 304 to 139 here (it were 449 before the preceding commit).

While just at it, also improve the other headers a bit.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

internal.h doesn't rely on it; instead include it directly
in every user that needs it (a filter needing it is basically
equivalent to it using FILTER_QUERY_FUNC, i.e. a majority of
filters doesn't need it).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

This file is only used by the greyedge filter and therefore
only compiled if said filter is enabled. This also allows
to remove a config_components.h inclusion, avoiding unnecessary
rebuilds.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Lots of video filters use a very simple input or output:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset.

Given that we never use pointer equality for inputs or outputs*,
we can simply use a single AVFilterPad instead of dozens; this
even saves .data.rel.ro (8312B here) as well as relocations.

*: In fact, several filters (like the filters in vf_lut.c)
already use the same outputs; furthermore, ff_filter_alloc()
duplicates the input and output pads so that we do not even
work with the pads directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

internal.h does not depend on video.h (and should not depend on it)
and therefore should not include video.h at all; instead all users
of video.h should include it directly.

Doing so also avoids unnecessary video.h inclusions in files that
don't need it, like most audio filters.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Lots of audio filters use very simple inputs or outputs:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_AUDIO; everything else is unset.

Given that we never use pointer equality for inputs or outputs*,
we can simply use a single AVFilterPad instead of dozens; this
even saves .data.rel.ro (4784B here) as well as relocations.

*: In fact, several filters (like the filters in af_biquads.c)
already use the same inputs; furthermore, ff_filter_alloc()
duplicates the input and output pads so that we do not even
work with the pads directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>

bits_per_raw_sample might not set when remux raw PCM.

Fix #10433.
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>

Code should make more sense now

Fixes: out of array access
Fixes: 58299/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-6627570448465920

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegReviewed-by: Pierre-Anthony Lemieux <pal@sandflow.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Namely proresenc_anatoliy.c.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Namely h264_slice.c.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

h264_sei.h is no longer used since the SEIs were moved to sei.h;
this also avoids inclusions of avcodec.h and bytestream.h.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

Possible since 28505848.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>