FFmpeg/libavcodec/vp9dsp.c
Ronald S. Bultje fd8b90f5f6 vp9: fix overflow in 8x8 topleft 32x32 idct ssse3 version.
Also disable the mmx/iwht optimization when the bitexact flag is set.
With synthetically coded coefficients (i.e. these that lead to a
residual well outside the [-255,255] range), our optimizations will
overflow. It doesn't make sense to fix the overflows, since they can
only occur on synthetic input, not on real fwht-generated input. Thus,
add a bitexact flag that disables this optimization.
2015-09-10 07:51:16 -04:00

42 lines
1.3 KiB
C

/*
* VP9 compatible video decoder
*
* Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
* Copyright (C) 2013 Clément Bœsch <u pkh me>
*
* 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/avassert.h"
#include "libavutil/common.h"
#include "vp9dsp.h"
av_cold void ff_vp9dsp_init(VP9DSPContext *dsp, int bpp, int bitexact)
{
if (bpp == 8) {
ff_vp9dsp_init_8(dsp);
} else if (bpp == 10) {
ff_vp9dsp_init_10(dsp);
} else {
av_assert0(bpp == 12);
ff_vp9dsp_init_12(dsp);
}
if (ARCH_X86) ff_vp9dsp_init_x86(dsp, bpp, bitexact);
if (ARCH_MIPS) ff_vp9dsp_init_mips(dsp, bpp);
}