Parse the playlist to recover the start sequence and previously
generated segments and continue muxing from there.

Mainly useful for near-seamless recovery in live scenarios.

This was actually broken when committed in 46e3936f; the
test never succeeded, and thus, _aligned_malloc wasn't actually
used on legacy mingw.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Clang support for Altivec/VSX uses a different approach.

Add dxva2_pool_release_dummy() and use it in call to
av_buffer_create() in dxva2_pool_alloc().

Prior to this change, av_buffer_create() was called with NULL for the
third argument, which indicates that av_buffer_default_free() should
be used to free the buffer's data.  Eventually, it gets to
buffer_pool_free() and calls buf->free() on a surface object (which is
av_buffer_default_free()).

This can result in a crash when the debug version of the C-runtime is
used on Windows.  While it doesn't appear to result in a crash when
the release version of the C-runtime is used on Windows, it likely
results in memory corruption, since av_free() is being called on
memory that was allocated using
IDirectXVideoAccelerationService::CreateSurface().
Signed-off-by: Aaron Levinson <alevinsn@aracnet.com>
Reviewed-by: wm4 <nfxjfg@googlemail.com>
Reviewed-by: Steven Liu <lingjiujianke@gmail.com>
Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Currently it does not work at all.

Bug-Id: 1058

HEVCSEIPictureHash should store only the information extracted from the
bitstream and exported to the higher layer (the decoder or the parser).
The MD5 context is allocated, used and freed by this higher layer, so it
makes more sense for it to also be stored there.

This mimics the behavior of the now unused h264/hevc parser's split()
function and fixes decoding some files when extract_extradata bsf is
enabled.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Avoids unnecessary allocs+copies and makes the code slightly simpler.

While not yet used, these NAL units do already have some defined
semantics and are referred to elsewhere.

This avoids confusion with equivalent H.265 SEI values when both are
being used at the same time.

Same as f64d1100, for stream copy
rather than encode.

Signed-off-by: Martin Storsjö <martin@martin.st>

In these cases, the CTTS flag is set, but no edit list is necessary.
Signed-off-by: Martin Storsjö <martin@martin.st>

This reduces the need for an edit list; streams that start with
e.g. dts=-1, pts=0 can be encoded as dts=0, pts=0 (which is valid
in mov/mp4) by shifting the dts values of all packets forward.
This avoids the need for edit lists for such streams (while they
still are needed for audio streams with encoder delay).

This eases conformance with the DASH-IF interoperability guidelines.
Signed-off-by: Martin Storsjö <martin@martin.st>

Loads from this strictly doesn't require alignment, but specify it
just for consistency with the arm version.
Signed-off-by: Martin Storsjö <martin@martin.st>

clang now (in the upcoming 5.0 version) is capable of building our
arm assembly without relying on gas-preprocessor, although clang/LLVM
doesn't support .dn register aliases.

The VC1 MC assembly was only built and used if the chosen assembler
supported the .dn directives though. This was supported as long as
gas-preprocessor was used.

This means that VC1 decoding got a speed regression on clang 5.0,
unless the user manually chose using gas-preprocessor again.

By avoiding using the .dn register aliases, we can build the VC1 MC
assembly with the latest clang version.

Support for the .dn/.qn directives in clang/LLVM isn't actively planned,
see https://bugs.llvm.org/show_bug.cgi?id=18199.

This partially reverts 896a5bff.
Signed-off-by: Martin Storsjö <martin@martin.st>

This is more correct.
Signed-off-by: Martin Storsjö <martin@martin.st>

Bug-Id: 1036
CC: libav-stable@libav.org

It doesn't depend on hevcdec anymore.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Based on the H264 SEI implementation.

This will be mainly useful once support for SEI messages that can be
used by the hevc parser are implemented, like Picture Timing.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

When targeting windows, the .arch directive isn't available.

So far, when building for windows, we've always used gas-preprocessor,
both when using msvc's armasm and when using clang. Lately, clang/llvm
has implemented the last missing piece (altmacro support) for building
our assembly without gas-preprocessor. This means that we now build
for arm/windows with clang without any extra compatibility layer.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

This doesn't change the actual behaviour of the code but improves
readability.
Signed-off-by: Martin Storsjö <martin@martin.st>

Aliased compressed AAC bytes are almost certainly not meaningful SBR
data. In the wild this causes harsh artifacts switching HE-AAC streams
that don't have SBR headers aligned with segment boundaries.

Turning off SBR falls back to a default set of upsampling parameters
that can function as a sort of error concealment. This is consistent
with how the decoder handles other sorts of errors.

Bug-Id: 1047
CC: libav-stable@libav.org
Signed-off-by: Sean McGovern <gseanmcg@gmail.com>

This makes the currently semi-public avpriv_aac_parse_header() function
private to libavcodec and adds a proper public API function to return
the parts of the ADTS header required in libavformat.

This makes the bitstream.h header leaner.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Do not rely on indirectly including it from bitstream.h.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Signed-off-by: Martin Storsjö <martin@martin.st>

This is something of a hack.  It allocates a new hwframe context for
the target format, then maps it back to the source link and overwrites
the input link hw_frames_ctx so that the previous filter will receive
the frames we want from ff_get_video_buffer().  It may fail if
the previous filter imposes any additional constraints on the frames
it wants to use as output.

Also refactor a little and improve error messages to make failure
cases easier to understand.

Use the flags argument of av_hwframe_ctx_create_derived() to pass the
mapping flags which will be used on allocation.  Also, set the format
and hardware context on the allocated frame automatically - the user
should not be required to do this themselves.

Factorises out existing surface initialisation code to reuse.

Some frames contexts are not usable without additional format-specific
state in hwctx.  This change adds new functions frames_derive_from and
frames_derive_to to initialise this state appropriately when deriving
a frames context which will require it to be set.

This only supports one device globally, but more can be used by
passing them with input streams in hw_frames_ctx or by deriving new
devices inside a filter graph with hwmap.