Previously we would allocate a new one for every frame.  This instead
maintains an AVBufferPool of them to use as-needed.

Also makes the maximum size of an output buffer adapt to the frame
size - the fixed upper bound was a bit too easy to hit when encoding
large pictures at high quality.

Not needed any more because we no longer have any useful case which
will reinitialise with hardware frames here.

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

This makes sure the actual stream parameters are used, which is
important mainly for hardware decoding+filtering cases, which would
previously require various weird workarounds to handle the fact that a
fake software graph has to be constructed, but never used.
This should also improve behaviour in rare cases where
avformat_find_stream_info() does not provide accurate information.

This will be useful in the following commit, after which the muxer
timebase is not always available when encoding.

Currently, a filtergraph will pull in the output constraints from its
corresponding decoder context, which breaks proper layering. Instead,
explicitly send the constaints on the output parameters to the
filtergraph.

This is similar to what is done for filtergraph inputs in
30ab4c51a180610d9f1720c75518d763515c0d9f

Setting the filter input parameters is moved to init_input_stream(),
so that it is done before the decoder is opened, potentially overwriting
the information from avformat_find_stream_info() with less accurate
data.

This commit temporarily disables QSV transcoding with hw frames. The
functionality will be re-added in the following commits.

Currently, calling configure_filtergraph() will pull in the input
parameters from the corresponding decoder context. This has the
following disadvantages:
- the decoded frame is a more proper source for this information
- a filter accessing decoder data breaks proper layering

Add functions for explicitly sending the input stream parameters to a
filtergraph input - currently from a frame and a decoder. The decoder
one will be dropped in future commits after some more restructuring.

This should have no practical effect for now, but will make a difference
in the following commits.

The destination filter might expect the hw frames context to be already
set (this is the case e.g. for hwdownload).

The encode function is supposed to just return 0 on success.
This stems from a mixup with the return value of decode functions.
Signed-off-by: Martin Storsjö <martin@martin.st>

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

libavcodec/h264_slice.c:1384:9: warning: variable 'droppable' set but not used

The exit condition was missing.

CC: libav-stable@libav.org

No longer make a dummy device configuration to query.  Instead, just
return everything we recognise from the whole format list.  Also
change the device setup code to query that list only, rather than
intersecting it with the constraint output.

This makes hwupload more usable on mesa/gallium where the video
processor only declares support for RGB formats, making it unable to
deal with YUV formats before this patch.  It might introduce some
different trickier failures in the internal upload/download code
because the set of allowed formats there has changed, though I didn't
find any obvious regressions with i965.

Just a typo.  Add a comment to make it clearer what it's doing.

This was introduced by mistake in 39cdbb12 (only one of the
added variables were really needed).
Signed-off-by: Martin Storsjö <martin@martin.st>

The functions may not clean up properly after using MMX
registers. For the normal testing calls, the checkasm_checked_call
functions will do the cleanup (and check that functions that
should clean up do it as well), but when benchmarking functions
that don't clean up, we don't currently properly clean up at all.

This causes issues if a benchmarked function is followed by testing
of a function that is supposed to not clobber the MMX/FPU state but
doesn't touch it at all.
Signed-off-by: Martin Storsjö <martin@martin.st>

Currently it's exported as AVFrame.pkt_pts, which is also the only use
for that field. The reason it is done like this is that lavc used to
export various codec-specific "timing" information in AVFrame.pts, which
is not done anymore.

Since it is confusing to the callers to have a separate field which is
used only for decoder timestamps and nothing else, deprecate pkt_pts and
use just AVFrame.pts everywhere.

This is a more appropriate place for it.

For now it will only be used by the default get_buffer2 callback for
allocating hw frames.

Appeared in H.264 2016/02.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Adding hybrid log-gamma (https://en.wikipedia.org/wiki/Hybrid_Log-Gamma)
based on the standardization in ARIB STD-B67:
http://www.arib.or.jp/english/html/overview/doc/2-STD-B67v1_0.pdf

The choice of enum value of 18 is consistent with HEVC:
http://phenix.it-sudparis.eu/jct/doc_end_user/current_document.php?id=10481

And also with latest proposal for color format in mkv:
https://mailarchive.ietf.org/arch/search/?email_list=cellar&gbt=1&q=Colour+Format+proposalSigned-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

This will be needed in the following commits.

Fail immediately if automatic encoder selection failed. Always set the
stream_copy/encoding_needed flags in one place.

The current code assumes that encoding_needed is simply an inverse of
stream_copy, which is not true for manually attached files (for which
neither of those is true).

We already have all the necessary information in open_output_file().
This makes the information about the stream/filtergraph mappings
available earlier.