mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-30 11:22:14 +00:00
7ab9b30800
Also use a vpx prefix for them. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Range decoder functions common to VP8 and VP9
|
|
*/
|
|
|
|
#ifndef AVCODEC_VP89_RAC_H
|
|
#define AVCODEC_VP89_RAC_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/attributes.h"
|
|
|
|
#include "vpx_rac.h"
|
|
|
|
// rounding is different than vpx_rac_get, is vpx_rac_get wrong?
|
|
static av_always_inline int vp89_rac_get(VPXRangeCoder *c)
|
|
{
|
|
return vpx_rac_get_prob(c, 128);
|
|
}
|
|
|
|
static av_unused int vp89_rac_get_uint(VPXRangeCoder *c, int bits)
|
|
{
|
|
int value = 0;
|
|
|
|
while (bits--) {
|
|
value = (value << 1) | vp89_rac_get(c);
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
// how probabilities are associated with decisions is different I think
|
|
// well, the new scheme fits in the old but this way has one fewer branches per decision
|
|
static av_always_inline int vp89_rac_get_tree(VPXRangeCoder *c, const int8_t (*tree)[2],
|
|
const uint8_t *probs)
|
|
{
|
|
int i = 0;
|
|
|
|
do {
|
|
i = tree[i][vpx_rac_get_prob(c, probs[i])];
|
|
} while (i > 0);
|
|
|
|
return -i;
|
|
}
|
|
|
|
#endif /* AVCODEC_VP89_RAC_H */
|