exp2 is faster.
It may be possible to optimize further; e.g the exponents seem to be
multiples of 0.25. This requires study though.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
If that is the case, the loop setting predictor_state in
sonic_decode_frame causes out of bounds reads of int_samples, which has
only frame_size number of elements.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
exp2 suffices here. Some trivial speedup is done in addition here by
reusing results.
This retains accuracy, and in particular results in identical values
with GNU libm + gcc/clang.
sample benchmark (Haswell, GNU/Linux):
proposed : 424160 decicycles in pow_table, 512 runs, 0 skips
exp2 only: 1262093 decicycles in pow_table, 512 runs, 0 skips
old : 2849085 decicycles in pow_table, 512 runs, 0 skips
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
arc4random() was designed as a superior interface for system random
number generation, designed for OpenBSD and subsequently incorporated by
other BSD's, Mac OS X, and some non-standard libc's. It is thus an improvement to
use it whenever available.
As a side note, this may or may not get included in glibc, and there is
a proposal to create a posix_random family based on these ideas:
http://austingroupbugs.net/view.php?id=859.
Tested on Mac OS X.
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
* commit 'f1ccd076801444ab7f524cb13e0886faaf10fd50':
h264: do not call frame_start() for missing frames
Not merged, FFmpeg does a lot more in frame_start to setup missing frames
as well (like coloring them), and the overhead of the other setup is
minimal.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit 'd5f5c90be9ec120f1320dcdd808b7bd917dee47c':
rtsp: free opts dictionary on failure of getnameinfo
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit 'e02de9df4b218bd6e1e927b67fd4075741545688':
lavc: export Dirac parsing API used by the ogg demuxer as public
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit 'f0b769c16daafa64720dcba7fa81a9f5255e1d29':
lavc: add a packet side data type for VBV-like parameters
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit 'e63e3797a1ed9346f529848e6ba3d27fd2d2cc8d':
avconv: pass the global codec side data to the muxer
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit '31c51f7441de07b88cfea2550245bf1f5140cb8f':
avpacket: add a function for wrapping existing data as side data
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit 'b09ad37c83841c399abb7f2503a2ab214d0c2d48':
h264: derive the delay from the level when it's not present
Merged without changing the strict_std_compliance check, as it breaks FATE
and changes decoding behavior.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
* commit '792b9c9dfcf44b657d7854368d975b5ca3bc22ca':
h264: set frame_num in start_frame(), not decode_slice_header()
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
This adds a computation of the progress speed versus realtime ("Nx")
to the status line and to the report log. It uses the progress time
as already calculated for total output time as a base.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Due to this typo max_center can be too large, causing nlsf to be set to
too large values, which in turn can cause nlsf[i - 1] + min_delta[i] to
overflow to a negative value, which is not allowed for nlsf and can
cause an out of bounds read in silk_lsf2lpc.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
These postfixes can be computed statically, and there is no need to
waste runtime resources.
Tested with FATE.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Michael Niedermayer
Ganesh Ajjanagadde
Andreas Cadhalpun
rsn8887
Hendrik Leppkes
Moritz Barsnick
Kieran Kunhya
Stefano Sabatini
Paul B Mahol
Vicente Olivert Riera