path: root/vp8/decoder/detokenize.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 "vp8/common/type_aliases.h"
#include "vp8/common/blockd.h"
#include "onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "detokenize.h"

#include "vp8/common/seg_common.h"

#define BOOL_DATA UINT8

#define OCB_X PREV_COEF_CONTEXTS * ENTROPY_NODES

DECLARE_ALIGNED(16, int, coef_bands_x[16]) =
{
    0 * OCB_X, 1 * OCB_X, 2 * OCB_X, 3 * OCB_X,
    6 * OCB_X, 4 * OCB_X, 5 * OCB_X, 6 * OCB_X,
    6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X,
    6 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X
};
DECLARE_ALIGNED(16, int, coef_bands_x_8x8[64]) =
{
  0 * OCB_X, 1 * OCB_X, 2 * OCB_X, 3 * OCB_X, 5 * OCB_X, 4 * OCB_X, 4 * OCB_X, 5 * OCB_X,
  5 * OCB_X, 3 * OCB_X, 6 * OCB_X, 3 * OCB_X, 5 * OCB_X, 4 * OCB_X, 6 * OCB_X, 6 * OCB_X,
  6 * OCB_X, 5 * OCB_X, 5 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X,
  6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X,
  6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X,
  7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X,
  7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X,
  7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X, 7 * OCB_X,
};

#define EOB_CONTEXT_NODE            0
#define ZERO_CONTEXT_NODE           1
#define ONE_CONTEXT_NODE            2
#define LOW_VAL_CONTEXT_NODE        3
#define TWO_CONTEXT_NODE            4
#define THREE_CONTEXT_NODE          5
#define HIGH_LOW_CONTEXT_NODE       6
#define CAT_ONE_CONTEXT_NODE        7
#define CAT_THREEFOUR_CONTEXT_NODE  8
#define CAT_THREE_CONTEXT_NODE      9
#define CAT_FIVE_CONTEXT_NODE       10

#define CAT1_MIN_VAL    5
#define CAT2_MIN_VAL    7
#define CAT3_MIN_VAL   11
#define CAT4_MIN_VAL   19
#define CAT5_MIN_VAL   35
#define CAT6_MIN_VAL   67
#define CAT1_PROB0    159
#define CAT2_PROB0    145
#define CAT2_PROB1    165

#define CAT3_PROB0 140
#define CAT3_PROB1 148
#define CAT3_PROB2 173

#define CAT4_PROB0 135
#define CAT4_PROB1 140
#define CAT4_PROB2 155
#define CAT4_PROB3 176

#define CAT5_PROB0 130
#define CAT5_PROB1 134
#define CAT5_PROB2 141
#define CAT5_PROB3 157
#define CAT5_PROB4 180

static const unsigned char cat6_prob[14] =
{ 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0 };

void vp8_reset_mb_tokens_context(MACROBLOCKD *x)
{
    /* Clear entropy contexts for Y2 blocks */
    if (x->mode_info_context->mbmi.mode != B_PRED &&
        x->mode_info_context->mbmi.mode != I8X8_PRED &&
        x->mode_info_context->mbmi.mode != SPLITMV)
    {
        vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
        vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
    }
    else
    {
        vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
        vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
    }
}

DECLARE_ALIGNED(16, extern const unsigned char, vp8_norm[256]);

//#define PREV_CONTEXT_INC(val) (2+((val)>2))
//#define PREV_CONTEXT_INC(val) (vp8_prev_token_class[(val)])
#if CONFIG_EXPANDED_COEF_CONTEXT
#define PREV_CONTEXT_INC(val) (vp8_prev_token_class[(val)>10?10:(val)])
#else
#define PREV_CONTEXT_INC(val) (2)
#endif


#if CONFIG_ADAPTIVE_ENTROPY
int get_token(int v)
{
    if (v < 0) v = -v;
    if (v == 0) return ZERO_TOKEN;
    else if (v == 1) return ONE_TOKEN;
    else if (v == 2) return TWO_TOKEN;
    else if (v == 3) return THREE_TOKEN;
    else if (v == 4) return FOUR_TOKEN;
    else if (v <= 6) return DCT_VAL_CATEGORY1;
    else if (v <= 10) return DCT_VAL_CATEGORY2;
    else if (v <= 18) return DCT_VAL_CATEGORY3;
    else if (v <= 34) return DCT_VAL_CATEGORY4;
    else if (v <= 66) return DCT_VAL_CATEGORY5;
    else return DCT_VAL_CATEGORY6;
}

void static count_tokens(INT16 *qcoeff_ptr, int block, int type,
                         ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l,
                         int eob, int seg_eob, FRAME_CONTEXT* const fc)
{
    int c, pt, token, band;
    VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
    for (c = !type; c < eob; ++c)
    {
        int rc = vp8_default_zig_zag1d[c];
        int v = qcoeff_ptr[rc];
        band = vp8_coef_bands[c];
        token = get_token(v);
        fc->coef_counts[type][band][pt][token]++;
        pt = vp8_prev_token_class[token];
    }
    if (eob < seg_eob)
    {
        band = vp8_coef_bands[c];
        fc->coef_counts[type][band][pt][DCT_EOB_TOKEN]++;
    }
}

void static count_tokens_8x8(INT16 *qcoeff_ptr, int block, int type,
                             ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l,
                             int eob, int seg_eob, FRAME_CONTEXT *fc)
{
    int c, pt, token, band;
    VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
    for (c = !type; c < eob; ++c)
    {
        int rc = (type == 1 ? vp8_default_zig_zag1d[c] : vp8_default_zig_zag1d_8x8[c]);
        int v = qcoeff_ptr[rc];
        band = (type == 1 ? vp8_coef_bands[c] : vp8_coef_bands_8x8[c]);
        token = get_token(v);
        fc->coef_counts_8x8[type][band][pt][token]++;
        pt = vp8_prev_token_class[token];
    }
    if (eob < seg_eob)
    {
        band = (type == 1 ? vp8_coef_bands[c] : vp8_coef_bands_8x8[c]);
        fc->coef_counts_8x8[type][band][pt][DCT_EOB_TOKEN]++;
    }
}
#endif


static int vp8_get_signed(BOOL_DECODER *br, int value_to_sign)
{
    const int split = (br->range + 1) >> 1;
    const VP8_BD_VALUE bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8);
    int v;

    if (br->count < 0)
        vp8dx_bool_decoder_fill(br);

    if (br->value < bigsplit) {
        br->range = split;
        v = value_to_sign;
    }
    else {
        br->range = br->range - split;
        br->value = br->value - bigsplit;
        v = -value_to_sign;
    }
    br->range += br->range;
    br->value += br->value;
    --br->count;

    return v;
}

#define WRITE_COEF_CONTINUE(val)                                  \
    {                                                             \
        Prob = coef_probs + (ENTROPY_NODES*PREV_CONTEXT_INC(val));\
        qcoeff_ptr[scan[c]] = (INT16) vp8_get_signed(br, val);    \
        c++;                                                      \
        continue;                                                 \
    }

#define ADJUST_COEF(prob, bits_count)      \
    do {                                   \
        if (vp8_read(br, prob))            \
            val += (UINT16)(1 << bits_count);\
    } while (0);

static int vp8_decode_coefs(VP8D_COMP *dx, const MACROBLOCKD *xd,
                            ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l, int type,
                            int seg_eob, INT16 *qcoeff_ptr, int i,
                            const int* const scan, int block_type,
                            const int* coef_bands)
{
    FRAME_CONTEXT* const fc = &dx->common.fc;
    BOOL_DECODER *br = xd->current_bc;
    int tmp, c = (type == 0);
    const vp8_prob *Prob;
    const vp8_prob *coef_probs =
        (block_type == TX_4X4) ? fc->coef_probs[type][0][0]
                               : fc->coef_probs_8x8[type][0][0];

    VP8_COMBINEENTROPYCONTEXTS(tmp, *a, *l);
    Prob = coef_probs + tmp * ENTROPY_NODES;

    while (1) {
        int val;
        const uint8_t* cat6 = cat6_prob;
        if (c == seg_eob) break;
        Prob += coef_bands[c];
        if (!vp8_read(br, Prob[EOB_CONTEXT_NODE]))
            break;
SKIP_START:
        if (c == seg_eob) break;
        if (!vp8_read(br, Prob[ZERO_CONTEXT_NODE])) {
            ++c;
            Prob = coef_probs + coef_bands[c];
            goto SKIP_START;
        }
        // ONE_CONTEXT_NODE_0_
        if (!vp8_read(br, Prob[ONE_CONTEXT_NODE])) {
            Prob = coef_probs + ENTROPY_NODES;
            qcoeff_ptr[scan[c]] = (INT16) vp8_get_signed(br, 1);
            ++c;
            continue;
        }
        // LOW_VAL_CONTEXT_NODE_0_
        if (!vp8_read(br, Prob[LOW_VAL_CONTEXT_NODE])) {
            if (!vp8_read(br, Prob[TWO_CONTEXT_NODE])) {
                WRITE_COEF_CONTINUE(2);
            }
            if (!vp8_read(br, Prob[THREE_CONTEXT_NODE])) {
                WRITE_COEF_CONTINUE(3);
            }
            WRITE_COEF_CONTINUE(4);
        }
        // HIGH_LOW_CONTEXT_NODE_0_
        if (!vp8_read(br, Prob[HIGH_LOW_CONTEXT_NODE])) {
            if (!vp8_read(br, Prob[CAT_ONE_CONTEXT_NODE])) {
                val = CAT1_MIN_VAL;
                ADJUST_COEF(CAT1_PROB0, 0);
                WRITE_COEF_CONTINUE(val);
            }
            val = CAT2_MIN_VAL;
            ADJUST_COEF(CAT2_PROB1, 1);
            ADJUST_COEF(CAT2_PROB0, 0);
            WRITE_COEF_CONTINUE(val);
        }
        // CAT_THREEFOUR_CONTEXT_NODE_0_
        if (!vp8_read(br, Prob[CAT_THREEFOUR_CONTEXT_NODE])) {
            if (!vp8_read(br, Prob[CAT_THREE_CONTEXT_NODE])) {
                val = CAT3_MIN_VAL;
                ADJUST_COEF(CAT3_PROB2, 2);
                ADJUST_COEF(CAT3_PROB1, 1);
                ADJUST_COEF(CAT3_PROB0, 0);
                WRITE_COEF_CONTINUE(val);
            }
            val = CAT4_MIN_VAL;
            ADJUST_COEF(CAT4_PROB3, 3);
            ADJUST_COEF(CAT4_PROB2, 2);
            ADJUST_COEF(CAT4_PROB1, 1);
            ADJUST_COEF(CAT4_PROB0, 0);
            WRITE_COEF_CONTINUE(val);
        }
        // CAT_FIVE_CONTEXT_NODE_0_:
        if (!vp8_read(br, Prob[CAT_FIVE_CONTEXT_NODE])) {
            val = CAT5_MIN_VAL;
            ADJUST_COEF(CAT5_PROB4, 4);
            ADJUST_COEF(CAT5_PROB3, 3);
            ADJUST_COEF(CAT5_PROB2, 2);
            ADJUST_COEF(CAT5_PROB1, 1);
            ADJUST_COEF(CAT5_PROB0, 0);
            WRITE_COEF_CONTINUE(val);
        }
        val = 0;
        while (*cat6) {
            val = (val << 1) | vp8_read(br, *cat6++);
        }
        val += CAT6_MIN_VAL;
        WRITE_COEF_CONTINUE(val);
    }
#if CONFIG_ADAPTIVE_ENTROPY
    if (block_type == TX_4X4)
        count_tokens(qcoeff_ptr, i, type, a, l, c, seg_eob, fc);
    else
        count_tokens_8x8(qcoeff_ptr, i, type, a, l, c, seg_eob, fc);
#endif
    return c;
}

int vp8_decode_mb_tokens_8x8(VP8D_COMP *pbi, MACROBLOCKD *xd)
{
    ENTROPY_CONTEXT* const A = (ENTROPY_CONTEXT *)xd->above_context;
    ENTROPY_CONTEXT* const L = (ENTROPY_CONTEXT *)xd->left_context;

    char* const eobs = xd->eobs;
    int c, i, type, eobtotal = 0, seg_eob;
    const int segment_id = xd->mode_info_context->mbmi.segment_id;
    const int seg_active = segfeature_active(xd, segment_id, SEG_LVL_EOB);
    INT16 *qcoeff_ptr = &xd->qcoeff[0];
    if (xd->mode_info_context->mbmi.mode != B_PRED &&
        xd->mode_info_context->mbmi.mode != SPLITMV)
    {
        ENTROPY_CONTEXT* const a = A + vp8_block2above_8x8[24];
        ENTROPY_CONTEXT* const l = L + vp8_block2left_8x8[24];
        const int* const scan = vp8_default_zig_zag1d;
        type = PLANE_TYPE_Y2;

        if (seg_active)
            seg_eob = get_segdata(xd, segment_id, SEG_LVL_EOB);
        else
            seg_eob = 4;
        c = vp8_decode_coefs(pbi, xd, a, l, type, seg_eob, qcoeff_ptr + 24*16,
                             24, scan, TX_8X8, coef_bands_x);
        a[0] = l[0] = ((eobs[24] = c) != !type);

        eobtotal += c - 4;

        type = PLANE_TYPE_Y_NO_DC;
    }
    else
        type = PLANE_TYPE_Y_WITH_DC;

    if (seg_active)
        seg_eob = get_segdata(xd, segment_id, SEG_LVL_EOB);
    else
        seg_eob = 64;
    for (i = 0; i < 24; i += 4)
    {
        ENTROPY_CONTEXT* const a = A + vp8_block2above_8x8[i];
        ENTROPY_CONTEXT* const l = L + vp8_block2left_8x8[i];
        const int* const scan = vp8_default_zig_zag1d_8x8;
        if (i == 16)
            type = PLANE_TYPE_UV;

        c = vp8_decode_coefs(pbi, xd, a, l, type, seg_eob, qcoeff_ptr,
                             i, scan, TX_8X8, coef_bands_x_8x8);
        a[0] = l[0] = ((eobs[i] = c) != !type);
        a[1] = a[0];
        l[1] = l[0];

        eobtotal += c;
        qcoeff_ptr += 64;
    }

    return eobtotal;
}

int vp8_decode_mb_tokens(VP8D_COMP *dx, MACROBLOCKD *xd)
{
    ENTROPY_CONTEXT* const A = (ENTROPY_CONTEXT *)xd->above_context;
    ENTROPY_CONTEXT* const L = (ENTROPY_CONTEXT *)xd->left_context;

    char* const eobs = xd->eobs;
    const int* const scan = vp8_default_zig_zag1d;
    int c, i, type, eobtotal = 0, seg_eob = 16;
    INT16 *qcoeff_ptr = &xd->qcoeff[0];

    int segment_id = xd->mode_info_context->mbmi.segment_id;
    if (segfeature_active(xd, segment_id, SEG_LVL_EOB))
        seg_eob = get_segdata(xd, segment_id, SEG_LVL_EOB);

    if (xd->mode_info_context->mbmi.mode != B_PRED &&
        xd->mode_info_context->mbmi.mode != I8X8_PRED &&
        xd->mode_info_context->mbmi.mode != SPLITMV) {
        ENTROPY_CONTEXT* const a = A + vp8_block2above[24];
        ENTROPY_CONTEXT* const l = L + vp8_block2left[24];
        type = PLANE_TYPE_Y2;

        c = vp8_decode_coefs(dx, xd, a, l, type, seg_eob, qcoeff_ptr + 24*16, 24,
                             scan, TX_4X4, coef_bands_x);
        a[0] = l[0] = ((eobs[24] = c) != !type);

        eobtotal += c - 16;

        type = PLANE_TYPE_Y_NO_DC;
    }
    else {
        type = PLANE_TYPE_Y_WITH_DC;
    }

    for (i = 0; i < 24; ++i) {
        ENTROPY_CONTEXT* const a = A + vp8_block2above[i];
        ENTROPY_CONTEXT* const l = L + vp8_block2left[i];
        if (i == 16)
            type = PLANE_TYPE_UV;

        c = vp8_decode_coefs(dx, xd, a, l, type, seg_eob, qcoeff_ptr,
                             i, scan, TX_4X4, coef_bands_x);
        a[0] = l[0] = ((eobs[i] = c) != !type);

        eobtotal += c;
        qcoeff_ptr += 16;
    }

    return eobtotal;
}