entropymv.c 14 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */


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#include "onyxc_int.h"
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#include "entropymv.h"

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#if CONFIG_HIGH_PRECISION_MV
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const MV_CONTEXT_HP vp8_mv_update_probs_hp[2] =
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{
    {{
        237,
        246,
        253, 253, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254,
        254, 254, 254, 254, 254, 250, 250, 252, 254, 254, 254
    }},
    {{
        231,
        243,
        245, 253, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254,
        254, 254, 254, 254, 254, 251, 251, 254, 254, 254, 254
    }}
};
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const MV_CONTEXT_HP vp8_default_mv_context_hp[2] =
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{
    {{
        /* row */
        162,                                        /* is short */
        128,                                        /* sign */
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        220, 204, 180, 192, 192, 119, 192, 192, 180, 140, 192, 192, 224, 224, 224, /* short tree */
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        128, 129, 132,  75, 145, 178, 206, 239, 254, 254, 254 /* long bits */
    }},
    {{
        /* same for column */
        164,                                        /* is short */
        128,
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        220, 204, 180, 192, 192, 119, 192, 192, 180, 140, 192, 192, 224, 224, 224, /* short tree */
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        128, 130, 130,  74, 148, 180, 203, 236, 254, 254, 254 /* long bits */
    }}
};
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#endif  /* CONFIG_HIGH_PRECISION_MV */

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const MV_CONTEXT vp8_mv_update_probs[2] =
{
    {{
        237,
        246,
        253, 253, 254, 254, 254, 254, 254,
        254, 254, 254, 254, 254, 250, 250, 252, 254, 254
    }},
    {{
        231,
        243,
        245, 253, 254, 254, 254, 254, 254,
        254, 254, 254, 254, 254, 251, 251, 254, 254, 254
    }}
};
const MV_CONTEXT vp8_default_mv_context[2] =
{
    {{
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        /* row */
        162,                                        /* is short */
        128,                                        /* sign */
        225, 146, 172, 147, 214,  39, 156,          /* short tree */
        128, 129, 132,  75, 145, 178, 206, 239, 254, 254 /* long bits */
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    }},
    {{
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        /* same for column */
        164,                                        /* is short */
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        128,
        204, 170, 119, 235, 140, 230, 228,
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        128, 130, 130,  74, 148, 180, 203, 236, 254, 254 /* long bits */
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    }}
};
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#if CONFIG_HIGH_PRECISION_MV
const vp8_tree_index vp8_small_mvtree_hp [30] =
{
     2,  16,
     4,  10,
     6,   8,
    -0,  -1,
    -2,  -3,
    12,  14,
    -4,  -5,
    -6,  -7,
    18,  24,
    20,  22,
    -8,  -9,
   -10, -11,
    26,  28,
   -12, -13,
   -14, -15
};
struct vp8_token_struct vp8_small_mvencodings_hp [16];
#endif  /* CONFIG_HIGH_PRECISION_MV */

const vp8_tree_index vp8_small_mvtree [14] =
{
    2, 8,
    4, 6,
    -0, -1,
    -2, -3,
    10, 12,
    -4, -5,
    -6, -7
};
struct vp8_token_struct vp8_small_mvencodings [8];


__inline static void calc_prob(vp8_prob *p, const unsigned int ct[2], int pbits)
{
    const unsigned int tot = ct[0] + ct[1];
    if (tot)
    {
        const vp8_prob x = ((ct[0] * 255) / tot) & -(1<<(8-pbits));
        *p = x ? x : 1;
    }
}

static void compute_component_probs(
    const unsigned int events [MVvals],
    vp8_prob Pnew [MVPcount],
    unsigned int is_short_ct[2],
    unsigned int sign_ct[2],
    unsigned int bit_ct [mvlong_width] [2],
    unsigned int short_ct  [mvnum_short],
    unsigned int short_bct [mvnum_short-1] [2]
)
{
    is_short_ct[0] = is_short_ct[1] = 0;
    sign_ct[0] = sign_ct[1] = 0;
    vpx_memset(bit_ct, 0, sizeof(unsigned int)*mvlong_width*2);
    vpx_memset(short_ct, 0, sizeof(unsigned int)*mvnum_short);
    vpx_memset(short_bct, 0, sizeof(unsigned int)*(mvnum_short-1)*2);

    {
        const int c = events [mv_max];
        is_short_ct [0] += c;    // Short vector
        short_ct [0] += c;       // Magnitude distribution
    }
    {
        int j = 1;
        do
        {
            const int c1 = events [mv_max + j];  //positive
            const int c2 = events [mv_max - j];  //negative
            const int c  = c1 + c2;
            int a = j;

            sign_ct [0] += c1;
            sign_ct [1] += c2;

            if (a < mvnum_short)
            {
                is_short_ct [0] += c;     // Short vector
                short_ct [a] += c;       // Magnitude distribution
            }
            else
            {
                int k = mvlong_width - 1;
                is_short_ct [1] += c;     // Long vector

                do
                  bit_ct [k] [(a >> k) & 1] += c;

                while (--k >= 0);
            }
        }
        while (++j <= mv_max);
    }
    calc_prob(Pnew + mvpis_short, is_short_ct, 8);

    calc_prob(Pnew + MVPsign, sign_ct, 8);

    {
        vp8_prob p [mvnum_short - 1];    /* actually only need branch ct */
        int j = 0;

        vp8_tree_probs_from_distribution(
            mvnum_short, vp8_small_mvencodings, vp8_small_mvtree,
            p, short_bct, short_ct,
            256, 1
            );

        do
            calc_prob(Pnew + MVPshort + j, short_bct[j], 8);
        while (++j < mvnum_short - 1);
    }

    {
        int j = 0;
        do
            calc_prob(Pnew + MVPbits + j, bit_ct[j], 8);
        while (++j < mvlong_width);
    }
}

#if CONFIG_HIGH_PRECISION_MV
static void compute_component_probs_hp(
    const unsigned int events [MVvals_hp],
    vp8_prob Pnew [MVPcount_hp],
    unsigned int is_short_ct[2],
    unsigned int sign_ct[2],
    unsigned int bit_ct [mvlong_width_hp] [2],
    unsigned int short_ct  [mvnum_short_hp],
    unsigned int short_bct [mvnum_short_hp-1] [2]
)
{
    is_short_ct[0] = is_short_ct[1] = 0;
    sign_ct[0] = sign_ct[1] = 0;
    vpx_memset(bit_ct, 0, sizeof(unsigned int)*mvlong_width_hp*2);
    vpx_memset(short_ct, 0, sizeof(unsigned int)*mvnum_short_hp);
    vpx_memset(short_bct, 0, sizeof(unsigned int)*(mvnum_short_hp-1)*2);

    {
        const int c = events [mv_max_hp];
        is_short_ct [0] += c;    // Short vector
        short_ct [0] += c;       // Magnitude distribution
    }
    {
        int j = 1;
        do
        {
            const int c1 = events [mv_max_hp + j];  //positive
            const int c2 = events [mv_max_hp - j];  //negative
            const int c  = c1 + c2;
            int a = j;

            sign_ct [0] += c1;
            sign_ct [1] += c2;

            if (a < mvnum_short_hp)
            {
                is_short_ct [0] += c;     // Short vector
                short_ct [a] += c;       // Magnitude distribution
            }
            else
            {
                int k = mvlong_width_hp - 1;
                is_short_ct [1] += c;     // Long vector

                do
                  bit_ct [k] [(a >> k) & 1] += c;

                while (--k >= 0);
            }
        }
        while (++j <= mv_max_hp);
    }
    calc_prob(Pnew + mvpis_short_hp, is_short_ct, 8);

    calc_prob(Pnew + MVPsign_hp, sign_ct, 8);

    {
        vp8_prob p [mvnum_short_hp - 1];    /* actually only need branch ct */
        int j = 0;

        vp8_tree_probs_from_distribution(
            mvnum_short_hp, vp8_small_mvencodings_hp, vp8_small_mvtree_hp,
            p, short_bct, short_ct,
            256, 1
            );

        do
            calc_prob(Pnew + MVPshort_hp + j, short_bct[j], 8);
        while (++j < mvnum_short_hp - 1);
    }

    {
        int j = 0;
        do
            calc_prob(Pnew + MVPbits_hp + j, bit_ct[j], 8);
        while (++j < mvlong_width_hp);
    }
}
#endif  /* CONFIG_HIGH_PRECISION_MV */

void vp8_entropy_mv_init()
{
    vp8_tokens_from_tree(vp8_small_mvencodings, vp8_small_mvtree);
#if CONFIG_HIGH_PRECISION_MV
    vp8_tokens_from_tree(vp8_small_mvencodings_hp, vp8_small_mvtree_hp);
#endif
}

#if CONFIG_ADAPTIVE_ENTROPY
//#define MV_COUNT_TESTING
#define MV_COUNT_SAT 16
#define MV_MAX_UPDATE_FACTOR 128
void vp8_adapt_mv_probs(VP8_COMMON *cm)
{
    int i, t, count, factor;
#ifdef MV_COUNT_TESTING
    printf("static const unsigned int\nMVcount[2][MVvals]={\n");
    for (i = 0; i < 2; ++i)
    {
        printf("  { ");
        for (t = 0; t < MVvals; t++)
        {
            printf("%d, ", cm->fc.MVcount[i][t]);
            if (t%16 == 15 && t!=MVvals-1) printf("\n    ");
        }
        printf("},\n");
    }
    printf("};\n");
#if CONFIG_HIGH_PRECISION_MV
    printf("static const unsigned int\nMVcount_hp[2][MVvals_hp]={\n");
    for (i = 0; i < 2; ++i)
    {
        printf("  { ");
        for (t = 0; t < MVvals_hp; t++)
        {
            printf("%d, ", cm->fc.MVcount_hp[i][t]);
            if (t%16 == 15 && t!=MVvals_hp-1) printf("\n    ");
        }
        printf("},\n");
    }
    printf("};\n");
#endif
#endif  /* MV_COUNT_TESTING */

    for (i = 0; i < 2; ++i)
    {
        int prob;
        unsigned int is_short_ct[2];
        unsigned int sign_ct[2];
        unsigned int bit_ct [mvlong_width] [2];
        unsigned int short_ct  [mvnum_short];
        unsigned int short_bct [mvnum_short-1] [2];
        vp8_prob Pnew [MVPcount];
        compute_component_probs(cm->fc.MVcount[i], Pnew,
                                is_short_ct, sign_ct,
                                bit_ct, short_ct, short_bct);
        count = is_short_ct[0] + is_short_ct[1];
        count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
        factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
        prob = ((int)cm->fc.pre_mvc[i].prob[mvpis_short] * (256-factor) +
                (int)Pnew[mvpis_short] * factor + 128) >> 8;
        if (prob <= 0) cm->fc.mvc[i].prob[mvpis_short] = 1;
        else if (prob > 255) cm->fc.mvc[i].prob[mvpis_short] = 255;
        else cm->fc.mvc[i].prob[mvpis_short] = prob;

        count = sign_ct[0] + sign_ct[1];
        count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
        factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
        prob = ((int)cm->fc.pre_mvc[i].prob[MVPsign] * (256-factor) +
                (int)Pnew[MVPsign] * factor + 128) >> 8;
        if (prob <= 0) cm->fc.mvc[i].prob[MVPsign] = 1;
        else if (prob > 255) cm->fc.mvc[i].prob[MVPsign] = 255;
        else cm->fc.mvc[i].prob[MVPsign] = prob;

        for (t = 0; t < mvnum_short - 1; ++t)
        {
            count = short_bct[t][0] + short_bct[t][1];
            count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
            factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
            prob = ((int)cm->fc.pre_mvc[i].prob[MVPshort+t] * (256-factor) +
                    (int)Pnew[MVPshort+t] * factor + 128) >> 8;
            if (prob <= 0) cm->fc.mvc[i].prob[MVPshort+t] = 1;
            else if (prob > 255) cm->fc.mvc[i].prob[MVPshort+t] = 255;
            else cm->fc.mvc[i].prob[MVPshort+t] = prob;
        }
        for (t = 0; t < mvlong_width; ++t)
        {
            count = bit_ct[t][0] + bit_ct[t][1];
            count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
            factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
            prob = ((int)cm->fc.pre_mvc[i].prob[MVPbits+t] * (256-factor) +
                    (int)Pnew[MVPbits+t] * factor + 128) >> 8;
            if (prob <= 0) cm->fc.mvc[i].prob[MVPbits+t] = 1;
            else if (prob > 255) cm->fc.mvc[i].prob[MVPbits+t] = 255;
            else cm->fc.mvc[i].prob[MVPbits+t] = prob;
        }
    }
#if CONFIG_HIGH_PRECISION_MV
    for (i = 0; i < 2; ++i)
    {
        int prob;
        unsigned int is_short_ct[2];
        unsigned int sign_ct[2];
        unsigned int bit_ct [mvlong_width_hp] [2];
        unsigned int short_ct  [mvnum_short_hp];
        unsigned int short_bct [mvnum_short_hp-1] [2];
        vp8_prob Pnew [MVPcount_hp];
        compute_component_probs_hp(cm->fc.MVcount_hp[i], Pnew,
                                   is_short_ct, sign_ct,
                                   bit_ct, short_ct, short_bct);
        count = is_short_ct[0] + is_short_ct[1];
        count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
        factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
        prob = ((int)cm->fc.pre_mvc_hp[i].prob[mvpis_short_hp] * (256-factor) +
                (int)Pnew[mvpis_short_hp] * factor + 128) >> 8;
        if (prob <= 0) cm->fc.mvc_hp[i].prob[mvpis_short_hp] = 1;
        else if (prob > 255) cm->fc.mvc_hp[i].prob[mvpis_short_hp] = 255;
        else cm->fc.mvc_hp[i].prob[mvpis_short_hp] = prob;

        count = sign_ct[0] + sign_ct[1];
        count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
        factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
        prob = ((int)cm->fc.pre_mvc_hp[i].prob[MVPsign_hp] * (256-factor) +
                (int)Pnew[MVPsign_hp] * factor + 128) >> 8;
        if (prob <= 0) cm->fc.mvc_hp[i].prob[MVPsign_hp] = 1;
        else if (prob > 255) cm->fc.mvc_hp[i].prob[MVPsign_hp] = 255;
        else cm->fc.mvc_hp[i].prob[MVPsign_hp] = prob;

        for (t = 0; t < mvnum_short_hp - 1; ++t)
        {
            count = short_bct[t][0] + short_bct[t][1];
            count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
            factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
            prob = ((int)cm->fc.pre_mvc_hp[i].prob[MVPshort_hp+t] * (256-factor) +
                    (int)Pnew[MVPshort_hp+t] * factor + 128) >> 8;
            if (prob <= 0) cm->fc.mvc_hp[i].prob[MVPshort_hp+t] = 1;
            else if (prob > 255) cm->fc.mvc_hp[i].prob[MVPshort_hp+t] = 255;
            else cm->fc.mvc_hp[i].prob[MVPshort_hp+t] = prob;
        }
        for (t = 0; t < mvlong_width_hp; ++t)
        {
            count = bit_ct[t][0] + bit_ct[t][1];
            count = count > MV_COUNT_SAT ? MV_COUNT_SAT : count;
            factor = (MV_MAX_UPDATE_FACTOR * count / MV_COUNT_SAT);
            prob = ((int)cm->fc.pre_mvc_hp[i].prob[MVPbits_hp+t] * (256-factor) +
                    (int)Pnew[MVPbits_hp+t] * factor + 128) >> 8;
            if (prob <= 0) cm->fc.mvc_hp[i].prob[MVPbits_hp+t] = 1;
            else if (prob > 255) cm->fc.mvc_hp[i].prob[MVPbits_hp+t] = 255;
            else cm->fc.mvc_hp[i].prob[MVPbits_hp+t] = prob;
        }
    }
#endif
}
#endif  /* CONFIG_ADAPTIVE_ENTROPY */