This cannot beat the Zbb implementation, and it is unlikely that a real
meaningful CPU design would support V and not Zbb. The best loop rewrite
that I could come up with (4 shifts, 2 ands, 3 ors) is still ~40% slower
than Zbb.
A proper faster vector implementation should be feasible with the
cryptographic vector extensions, but that is a story for another time.
The code was blindly assuming that Zbb or V implied Zba. While the
earlier is practically always true, the later broke some QEMU setups,
as V was introduced earlier than Zba.
I cannot find the spec, but according to the original commit
d4fdba0df7, it's CAVS. e571305a71 changed it to AVS by
accident. Ten years on, nothing happened. We still have the
sample [1], however, since there is no cavs_mp4tofoobar bsf, the
cavs decoder doesn't work. I don't know if there is any use case.
[1] https://samples.ffmpeg.org/AVS/AVSFileFormat/AVSFileFormat.mp4
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
Even though they have the same size, and typically the same alignment,
uint32_t and float are under no circumstances compatible types in C.
The casts from float * to uint32_t * are invalid here. Insofar as the
resulting pointers are dereferenced, this is undefined behaviour.
This patch uses av_float2int() / av_int2float() instead.
Except for add_squares, telling the compiler that the output vector(s)
cannot alias helps quite a bit (cycles on SiFive U74-MC):
ps_add_squares_c: 98277.7
ps_add_squares_r: 98320.2
ps_hybrid_analysis_c: 3731.2
ps_hybrid_analysis_r: 2495.7
ps_hybrid_analysis_ileave_c: 20478.0
ps_hybrid_analysis_ileave_r: 16092.2
ps_hybrid_synthesis_deint_c: 19051.5
ps_hybrid_synthesis_deint_r: 15420.0
ps_mul_pair_single_c: 122941.2
ps_mul_pair_single_r: 91035.0
Encoders (usually) have no business modifying frame->data
(which need not be writable), so they should use the appropriate
pointers.
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Also allocate the AVFrame during init and use av_frame_replace()
to replace it later.
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
A private class for an encoder without options is useless.
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
frame is always != NULL for audio and video here
(this is checked by an assert and the frame is already dereferenced
before it reaches this code here).
Fixes Coverity issue #1538858.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This increases the group multiplier as per T-Head C910 benchmarks:
inverse_coupling_c: 4597.0
inverse_coupling_rvv_i32: 1312.7 (m1)
inverse_coupling_rvv_i32: 1116.7 (m2)
inverse_coupling_rvv_i32: 732.2 (m4)
inverse_coupling_rvv_i32: 898.0 (m8)
av_random_bytes() can use OS provided strong random functions and does not
depend soley on openssl/gcrypt external libraries.
Fixes ticket #10441.
Signed-off-by: Marton Balint <cus@passwd.hu>
map_func is supposed to be an array of const pointer to function
returning int, not an array of pointer to function returning const int.
Reported-By: Martin Storsjö
This is not actually used for anything. The configure check causes the
CPU feature flag to be set, but nothing consumes it at all.
While AArch64 does have VFP, it is only used for the scalar C code.
Conversely, it is still possible to disable VFP, by changing the
C compiler flags as before (though that only makes sense for an
hypothetical non-standard Armv8 platform without VFP).
Note that this retains the "vfp" option flag, for backward
compatibility and on the very remote but theoretically possible chance
that FFmpeg actually makes use of it in the future.
AV_CPU_FLAG_VFP is retained as it is actually used by AArch32.
The IMDCT offset is only relevant for NEON optimisations. There are no
VFP optimisations here that would justify the HAVE_VFP flag. In
practice, this makes no difference because HAVE_NEON is practically
always true for standard Armv8 platforms.
Requires a new upstream function to test not for *import* support on a
given output pixel format, but also whether we can render to it.
Fixes: https://github.com/haasn/libplacebo/issues/173
Stop claiming the argument is always a floating point number, which
* confuses floating point and decimal numbers
* is not always true even accounting for the above point
Read the timebase from FrameData rather than the input stream. This
should fix#10393 and generally be more reliable.
Replace the use of '-1' to indicate demuxing timebase with the string
'demux'. Also allow to request filter timebase with
'-enc_time_base filter'.
It now contains data from multiple sources, so group those items that
always come from the decoder. Also, initialize them to invalid values,
so that frames that did not originate from a decoder can be
distinguished.
This is possible now that enc_open() is always called with a non-NULL
frame for audio/video.
Previously the code would directly reach into the buffersink, which is a
layering violation.
When no frames were passed from a filtergraph to an encoder, but the
filtergraph is configured (i.e. has output parameters), encoder flush
code will use those parameters to initialize the encoder in a last-ditch
effort to produce some useful output.
Rework this process so that it is triggered by the filtergraph, which
now sends a dummy frame with parameters, but no data, to the encoder,
rather than the encoder reaching backwards into the filter.
This approach is more in line with the natural data flow from filters to
encoders and will allow to reduce encoder-filter interactions in
following commits.
This code is tested by fate-adpcm-ima-cunning-trunc-t2-track1, which (as
confirmed by Zane) is supposed to produce empty output.
This line was added in c30a4489b4 along with
AVStream.sample_aspect_ratio. However, configuring SAR for video
encoding is now done after this code (specifically in enc_open(), which
is called when the first video frame to be encoded is obtained), so this
line cannot have any meaningful effect.
Paul B Mahol
Rémi Denis-Courmont
Zhao Zhili
Steven Liu
Andreas Rheinhardt
James Almer
Marton Balint
Anton Khirnov
Pavel Koshevoy
Timo Rothenpieler
Niklas Haas