The ASUS V2 format is designed for a little-endian bitstream reader, yet
our encoder used an ordinary big-endian bitstream writer to write it;
the bits of every byte were swapped at the end and some data (namely the
numbers not in static tables) had to be bitreversed before writing it at
all, so that it would be reversed twice.
This commit stops doing so; instead, a little-endian bitstream writer is
used. This also necessitated to switch certain static tables, which
required trivial modifications to the decoder (that uses the same
tables).
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Change BitBuf into uint64_t on 64-bit x86. This means we need to flush the
buffer less often, which is a significant speed win. All other platforms,
including all 32-bit ones, are unchanged. Output bitstream is the same.
All API constraints are kept in place, e.g., you still cannot put_bits()
more than 31 bits at a time. This is so that codecs cannot accidentally
become 64-bit-only or similar.
Benchmarking on transcoding to various formats shows consistently
positive results:
dnxhd 25.60 fps -> 26.26 fps ( +2.6%)
dvvideo 24.88 fps -> 25.17 fps ( +1.2%)
ffv1 14.32 fps -> 14.58 fps ( +1.8%)
huffyuv 58.75 fps -> 63.27 fps ( +7.7%)
jpegls 6.22 fps -> 6.34 fps ( +1.8%)
magicyuv 57.10 fps -> 63.29 fps (+10.8%)
mjpeg 48.65 fps -> 49.01 fps ( +0.7%)
mpeg1video 76.41 fps -> 77.01 fps ( +0.8%)
mpeg2video 75.99 fps -> 77.43 fps ( +1.9%)
mpeg4 80.66 fps -> 81.37 fps ( +0.9%)
prores 12.35 fps -> 12.88 fps ( +4.3%)
prores_ks 16.20 fps -> 16.80 fps ( +3.7%)
rv20 62.80 fps -> 62.99 fps ( +0.3%)
utvideo 68.41 fps -> 76.32 fps (+11.6%)
Note that this includes video decoding and all other encoding work,
such as DCTs. If you isolate the actual bit-writing routines, it is
likely to be much more.
Benchmark details: Transcoding the first 30 seconds of Big Buck Bunny
in 1080p, Haswell 2.1 GHz, GCC 8.3, generally quantizer locked to
5.0. (Exceptions: DNxHD needs fixed bitrate, and JPEG-LS is so slow
that I only took the first 10 seconds, not 30.) All runs were done
ten times and single-threaded, top and bottom two results discarded to
get rid of outliers, arithmetic mean between the remaining six.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This should never be untrue, if it is, thats a bug
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Libav, for some reason, merged this as a public API function. This will
aid in future merges.
A define is left for backwards compat, just in case some person
used it, since it is in a public header.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This parameter can be used to inform the allocation code about how much
downsizing might occur, and can be used to optimize how to allocate the
packet
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
The rationale is that coded_frame was only used to communicate key_frame,
pict_type and quality to the caller, as well as a few other random fields,
in a non predictable, let alone consistent way.
There was agreement that there was no use case for coded_frame, as it is
a full-sized AVFrame container used for just 2-3 int-sized properties,
which shouldn't even belong into the AVCodecContext in the first place.
The appropriate AVPacket flag can be used instead of key_frame, while
quality is exported with the new AVPacketSideData quality factor.
There is no replacement for the other fields as they were unreliable,
mishandled or just not used at all.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Allocating coded_frame is what most encoders do anyway, so it makes
sense to always allocate and free it in a single place. Moreover a lot
of encoders freed the frame with av_freep() instead of the correct API
av_frame_free().
This bring uniformity to encoder behaviour and prevents applications
from erroneusly accessing this field when not allocated. Additionally
this helps isolating encoders that export information with coded_frame,
and heavily simplifies its deprecation.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Andreas Rheinhardt
Steinar H. Gunderson
Anton Khirnov
Michael Niedermayer
Moritz Barsnick
Derek Buitenhuis
Vittorio Giovara
Luca Barbato
Michael Niedermayer
Gabriel Dume
Diego Biurrun
Janne Grunau