On Tue, Feb 02, 2016 at 12:35:29PM +0000, Rostislav Pehlivanov wrote: > A new revision of the 'Dirac' encoder previously submitted. > > Changes from previous version: > - Rename to vc2 > - Fix an out of array bound read on setting quantization matrices > > Original commit message: > > This commit adds a new encoder capable of creating SMPTE Dirac/VC-2 HQ > profile files. > > Dirac is a wavelet based codec created by the BBC a little more than 10 > years ago. Since then, wavelets have mostly gone out of style as they > did not provide adequate encoding gains at lower bitrates. Dirac was a > fully featured video codec equipped with perceptual masking, support for > most popular pixel formats, interlacing, overlapped-block motion > compensation, and other features. It found new life after being stripped > of various features and standardized as the VC-2 codec by the SMPTE with > an extra profile, the HQ profile that this encoder supports, added. > > The HQ profile was based off of the Low-Delay profile previously > existing in Dirac. The profile forbids DC prediction and arithmetic > coding to focus on high performance and low delay at higher bitrates. > The standard bitrates for this profile vary but generally 1:4 > compression is expected (~525 Mbps vs the 2200 Mbps for uncompressed > 1080p50). The codec only supports I-frames, hence the high bitrates. > > The structure of this encoder is simple: do a DWT transform on the > entire image, split it into multiple slices (specified by the user) and > encode them in parallel. All of the slices are of the same size, making > rate control and threading very trivial. Although only in C, this > encoder > is capable of 30 frames per second on an 4 core 8 threads Ivy Bridge. > A lookup table is used to encode most of the coefficients. > > No code was used from the GSoC encoder from 2007 except for the 2 > transform functions in diracenc_transforms.c. All other code was written > from scratch. > > This encoder outperforms any other encoders in quality, usability and in > features. Other existing implementations do not support 4 level > transforms or 64x64 blocks (slices), which greatly increase compression. > > As previously said, the codec is meant for broadcasting, hence support > for non-broadcasting image widths, heights, bit depths, aspect ratios, > etc. are limited by the "level". Although this codec supports a few > chroma subsamplings (420, 422, 444), signalling those is generally > outside the specifications of the level used (3) and the reference > decoder will outright refuse to read any image with such a flag > signalled (it only supports 1920x1080 yuv422p10). However, most > implementations will happily read files with alternate dimensions, > framerates and formats signalled. > > Therefore, in order to encode files other than 1080p50 yuv422p10le, you > need to provide an "-strict -2" argument to the command line. The FFmpeg > decoder will happily read any files made with non-standard parameters, > dimensions and subsamplings, and so will other implementations. IMO this > should be "-strict -1", but I'll leave that up for discussion. > > There are still plenty of stuff to implement, for instance 5 more > wavelet transforms are still in the specs and supported by the decoder. > > Signed-off-by: Rostislav Pehlivanov <atomnu...@gmail.com> > --- > libavcodec/Makefile | 1 + > libavcodec/allcodecs.c | 1 + > libavcodec/vc2enc.c | 1154 > +++++++++++++++++++++++++++++++++++++++++++++++ > libavcodec/vc2enc_dwt.c | 234 ++++++++++ > libavcodec/vc2enc_dwt.h | 54 +++ > 5 files changed, 1444 insertions(+) > create mode 100644 libavcodec/vc2enc.c > create mode 100644 libavcodec/vc2enc_dwt.c > create mode 100644 libavcodec/vc2enc_dwt.h > > diff --git a/libavcodec/Makefile b/libavcodec/Makefile > index 941057b..f6a4fbb 100644 > --- a/libavcodec/Makefile > +++ b/libavcodec/Makefile > @@ -543,6 +543,7 @@ OBJS-$(CONFIG_VC1_DECODER) += vc1dec.o > vc1_block.o vc1_loopfilter.o > wmv2dsp.o > OBJS-$(CONFIG_VC1_MMAL_DECODER) += mmaldec.o > OBJS-$(CONFIG_VC1_QSV_DECODER) += qsvdec_vc1.o > +OBJS-$(CONFIG_VC2_ENCODER) += vc2enc.o vc2enc_dwt.o diractab.o > OBJS-$(CONFIG_VCR1_DECODER) += vcr1.o > OBJS-$(CONFIG_VMDAUDIO_DECODER) += vmdaudio.o > OBJS-$(CONFIG_VMDVIDEO_DECODER) += vmdvideo.o > diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c > index c7c1af5..2097db0 100644 > --- a/libavcodec/allcodecs.c > +++ b/libavcodec/allcodecs.c > @@ -336,6 +336,7 @@ void avcodec_register_all(void) > REGISTER_DECODER(VC1IMAGE, vc1image); > REGISTER_DECODER(VC1_MMAL, vc1_mmal); > REGISTER_DECODER(VC1_QSV, vc1_qsv); > + REGISTER_ENCODER(VC2, vc2); > REGISTER_DECODER(VCR1, vcr1); > REGISTER_DECODER(VMDVIDEO, vmdvideo); > REGISTER_DECODER(VMNC, vmnc); > diff --git a/libavcodec/vc2enc.c b/libavcodec/vc2enc.c > new file mode 100644 > index 0000000..afafe42 > --- /dev/null > +++ b/libavcodec/vc2enc.c > @@ -0,0 +1,1154 @@ > +/* > + * Copyright (C) 2016 Open Broadcast Systems Ltd. > + * Author (C) 2016 Rostislav Pehlivanov <atomnu...@gmail.com> > + * > + * This file is part of FFmpeg. > + * > + * FFmpeg is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License as published by the Free Software Foundation; either > + * version 2.1 of the License, or (at your option) any later version. > + * > + * FFmpeg is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * Lesser General Public License for more details. > + * > + * You should have received a copy of the GNU Lesser General Public > + * License along with FFmpeg; if not, write to the Free Software > + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 > USA > + */ > + > +#include "libavutil/ffversion.h" > +#include "libavutil/pixdesc.h" > +#include "libavutil/opt.h" > +#include "dirac.h" > +#include "put_bits.h" > +#include "internal.h" > + > +#include "vc2enc_dwt.h"
> +#include "diractab.h" src/libavcodec/diracdec.c:40:22: fatal error: diractab.h: No such file or directory [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Frequently ignored answer#1 FFmpeg bugs should be sent to our bugtracker. User questions about the command line tools should be sent to the ffmpeg-user ML. And questions about how to use libav* should be sent to the libav-user ML.
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