chromium/third_party/libvpx/source/libvpx/vp8/encoder/tokenize.c

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "onyx_int.h"
#include "tokenize.h"
#include "vpx_mem/vpx_mem.h"

/* Global event counters used for accumulating statistics across several
   compressions, then generating context.c = initial stats. */

void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t);
void vp8_fix_contexts(MACROBLOCKD *x);

#include "dct_value_tokens.h"
#include "dct_value_cost.h"

const TOKENVALUE *const vp8_dct_value_tokens_ptr = …;
const short *const vp8_dct_value_cost_ptr = …;

#if 0
int skip_true_count = 0;
int skip_false_count = 0;
#endif

/* function used to generate dct_value_tokens and dct_value_cost tables */
/*
static void fill_value_tokens()
{

    TOKENVALUE *t = dct_value_tokens + DCT_MAX_VALUE;
    const vp8_extra_bit_struct *e = vp8_extra_bits;

    int i = -DCT_MAX_VALUE;
    int sign = 1;

    do
    {
        if (!i)
            sign = 0;

        {
            const int a = sign ? -i : i;
            int eb = sign;

            if (a > 4)
            {
                int j = 4;

                while (++j < 11  &&  e[j].base_val <= a) {}

                t[i].Token = --j;
                eb |= (a - e[j].base_val) << 1;
            }
            else
                t[i].Token = a;

            t[i].Extra = eb;
        }

        // initialize the cost for extra bits for all possible coefficient
value.
        {
            int cost = 0;
            const vp8_extra_bit_struct *p = vp8_extra_bits + t[i].Token;

            if (p->base_val)
            {
                const int extra = t[i].Extra;
                const int Length = p->Len;

                if (Length)
                    cost += vp8_treed_cost(p->tree, p->prob, extra >> 1,
Length);

                cost += vp8_cost_bit(vp8_prob_half, extra & 1); // sign
                dct_value_cost[i + DCT_MAX_VALUE] = cost;
            }

        }

    }
    while (++i < DCT_MAX_VALUE);

    vp8_dct_value_tokens_ptr = dct_value_tokens + DCT_MAX_VALUE;
    vp8_dct_value_cost_ptr   = dct_value_cost + DCT_MAX_VALUE;
}
*/

static void tokenize2nd_order_b(MACROBLOCK *x, TOKENEXTRA **tp, VP8_COMP *cpi) { … }

static void tokenize1st_order_b(
    MACROBLOCK *x, TOKENEXTRA **tp,
    int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */
    VP8_COMP *cpi) { … }

static int mb_is_skippable(MACROBLOCKD *x, int has_y2_block) { … }

void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t) { … }

static void stuff2nd_order_b(TOKENEXTRA **tp, ENTROPY_CONTEXT *a,
                             ENTROPY_CONTEXT *l, VP8_COMP *cpi, MACROBLOCK *x) { … }

static void stuff1st_order_b(TOKENEXTRA **tp, ENTROPY_CONTEXT *a,
                             ENTROPY_CONTEXT *l, int type, VP8_COMP *cpi,
                             MACROBLOCK *x) { … }

static void stuff1st_order_buv(TOKENEXTRA **tp, ENTROPY_CONTEXT *a,
                               ENTROPY_CONTEXT *l, VP8_COMP *cpi,
                               MACROBLOCK *x) { … }

void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t) { … }
void vp8_fix_contexts(MACROBLOCKD *x) { … }