xref: /rockchip-linux_mpp/mpp/codec/dec/vp9/vpx_rac.h (revision 437bfbeb9567cca9cd9080e3f6954aa9d6a94f18)

/*
*
* Copyright 2015 Rockchip Electronics Co. LTD
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/**
 * @file
 * VPX RangeCoder dec (common features)
 */

#ifndef VPX_RAC_H
#define VPX_RAC_H

#include <stdint.h>
#include <stdlib.h>

#include "mpp_common.h"

#define DECLARE_ALIGNED(n,t,v)      t v

typedef struct Vpxmv {
    DECLARE_ALIGNED(4, int16_t, x);
    int16_t y;
} Vpxmv;

typedef struct VpxRangeCoder {
    int high;
    int bits; /* stored negated (i.e. negative "bits" is a positive number of
                 bits left) in order to eliminate a negate in cache refilling */
    const uint8_t *buffer;
    const uint8_t *end;
    unsigned int code_word;
} VpxRangeCoder;

/**
 * vp56 specific range coder implementation
 */

extern const uint8_t vpx_norm_shift[256];
void vpx_init_range_decoder(VpxRangeCoder *c, const uint8_t *buf, int buf_size);
unsigned int vpx_rac_renorm(VpxRangeCoder *c);
int vpx_rac_get_prob(VpxRangeCoder *c, uint8_t prob);
int vpx_rac_get_prob_branchy(VpxRangeCoder *c, int prob);
// rounding is different than vpx_rac_get, is vpx_rac_get wrong?
int vpx_rac_get(VpxRangeCoder *c);
int vpx_rac_get_uint(VpxRangeCoder *c, int bits);

#endif /* VPX_RAC_H */