[libav.git] / libavcodec / vp6.c

/**
 * @file libavcodec/vp6.c
 * VP6 compatible video decoder
 *
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
 * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
 *  - upper 4bits: difference between encoded width and visible width
 *  - lower 4bits: difference between encoded height and visible height
 *
 * 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
 */

#include <stdlib.h>

#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
#include "huffman.h"

#include "vp56.h"
#include "vp56data.h"
#include "vp6data.h"


static void vp6_parse_coeff(VP56Context *s);
static void vp6_parse_coeff_huffman(VP56Context *s);

static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
                            int *golden_frame)
{
    VP56RangeCoder *c = &s->c;
    int parse_filter_info = 0;
    int coeff_offset = 0;
    int vrt_shift = 0;
    int sub_version;
    int rows, cols;
    int res = 1;
    int separated_coeff = buf[0] & 1;

    s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
    vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);

    if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
        sub_version = buf[1] >> 3;
        if (sub_version > 8)
            return 0;
        s->filter_header = buf[1] & 0x06;
        if (buf[1] & 1) {
            av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
            return 0;
        }
        if (separated_coeff || !s->filter_header) {
            coeff_offset = AV_RB16(buf+2) - 2;
            buf += 2;
            buf_size -= 2;
        }

        rows = buf[2];  /* number of stored macroblock rows */
        cols = buf[3];  /* number of stored macroblock cols */
        /* buf[4] is number of displayed macroblock rows */
        /* buf[5] is number of displayed macroblock cols */

        if (!s->macroblocks || /* first frame */
            16*cols != s->avctx->coded_width ||
            16*rows != s->avctx->coded_height) {
            avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
            if (s->avctx->extradata_size == 1) {
                s->avctx->width  -= s->avctx->extradata[0] >> 4;
                s->avctx->height -= s->avctx->extradata[0] & 0x0F;
            }
            res = 2;
        }

        vp56_init_range_decoder(c, buf+6, buf_size-6);
        vp56_rac_gets(c, 2);

        parse_filter_info = s->filter_header;
        if (sub_version < 8)
            vrt_shift = 5;
        s->sub_version = sub_version;
    } else {
        if (!s->sub_version)
            return 0;

        if (separated_coeff || !s->filter_header) {
            coeff_offset = AV_RB16(buf+1) - 2;
            buf += 2;
            buf_size -= 2;
        }
        vp56_init_range_decoder(c, buf+1, buf_size-1);

        *golden_frame = vp56_rac_get(c);
        if (s->filter_header) {
            s->deblock_filtering = vp56_rac_get(c);
            if (s->deblock_filtering)
                vp56_rac_get(c);
            if (s->sub_version > 7)
                parse_filter_info = vp56_rac_get(c);
        }
    }

    if (parse_filter_info) {
        if (vp56_rac_get(c)) {
            s->filter_mode = 2;
            s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
            s->max_vector_length = 2 << vp56_rac_gets(c, 3);
        } else if (vp56_rac_get(c)) {
            s->filter_mode = 1;
        } else {
            s->filter_mode = 0;
        }
        if (s->sub_version > 7)
            s->filter_selection = vp56_rac_gets(c, 4);
        else
            s->filter_selection = 16;
    }

    s->use_huffman = vp56_rac_get(c);

    s->parse_coeff = vp6_parse_coeff;
    if (coeff_offset) {
        buf      += coeff_offset;
        buf_size -= coeff_offset;
        if (buf_size < 0)
            return 0;
        if (s->use_huffman) {
            s->parse_coeff = vp6_parse_coeff_huffman;
            init_get_bits(&s->gb, buf, buf_size<<3);
        } else {
            vp56_init_range_decoder(&s->cc, buf, buf_size);
            s->ccp = &s->cc;
        }
    } else {
        s->ccp = &s->c;
    }

    return res;
}

static void vp6_coeff_order_table_init(VP56Context *s)
{
    int i, pos, idx = 1;

    s->modelp->coeff_index_to_pos[0] = 0;
    for (i=0; i<16; i++)
        for (pos=1; pos<64; pos++)
            if (s->modelp->coeff_reorder[pos] == i)
                s->modelp->coeff_index_to_pos[idx++] = pos;
}

static void vp6_default_models_init(VP56Context *s)
{
    VP56Model *model = s->modelp;

    model->vector_dct[0] = 0xA2;
    model->vector_dct[1] = 0xA4;
    model->vector_sig[0] = 0x80;
    model->vector_sig[1] = 0x80;

    memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
    memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
    memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
    memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
    memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));

    vp6_coeff_order_table_init(s);
}

static void vp6_parse_vector_models(VP56Context *s)
{
    VP56RangeCoder *c = &s->c;
    VP56Model *model = s->modelp;
    int comp, node;

    for (comp=0; comp<2; comp++) {
        if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
            model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
        if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
            model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
    }

    for (comp=0; comp<2; comp++)
        for (node=0; node<7; node++)
            if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
                model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);

    for (comp=0; comp<2; comp++)
        for (node=0; node<8; node++)
            if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
                model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
}

/* nodes must ascend by count, but with descending symbol order */
static int vp6_huff_cmp(const void *va, const void *vb)
{
    const Node *a = va, *b = vb;
    return (a->count - b->count)*16 + (b->sym - a->sym);
}

static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
                                const uint8_t *map, unsigned size, VLC *vlc)
{
    Node nodes[2*size], *tmp = &nodes[size];
    int a, b, i;

    /* first compute probabilities from model */
    tmp[0].count = 256;
    for (i=0; i<size-1; i++) {
        a = tmp[i].count *        coeff_model[i]  >> 8;
        b = tmp[i].count * (255 - coeff_model[i]) >> 8;
        nodes[map[2*i  ]].count = a + !a;
        nodes[map[2*i+1]].count = b + !b;
    }

    free_vlc(vlc);
    /* then build the huffman tree accodring to probabilities */
    ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
                       FF_HUFFMAN_FLAG_HNODE_FIRST);
}

static void vp6_parse_coeff_models(VP56Context *s)
{
    VP56RangeCoder *c = &s->c;
    VP56Model *model = s->modelp;
    int def_prob[11];
    int node, cg, ctx, pos;
    int ct;    /* code type */
    int pt;    /* plane type (0 for Y, 1 for U or V) */

    memset(def_prob, 0x80, sizeof(def_prob));

    for (pt=0; pt<2; pt++)
        for (node=0; node<11; node++)
            if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
                def_prob[node] = vp56_rac_gets_nn(c, 7);
                model->coeff_dccv[pt][node] = def_prob[node];
            } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
                model->coeff_dccv[pt][node] = def_prob[node];
            }

    if (vp56_rac_get(c)) {
        for (pos=1; pos<64; pos++)
            if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
                model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
        vp6_coeff_order_table_init(s);
    }

    for (cg=0; cg<2; cg++)
        for (node=0; node<14; node++)
            if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
                model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);

    for (ct=0; ct<3; ct++)
        for (pt=0; pt<2; pt++)
            for (cg=0; cg<6; cg++)
                for (node=0; node<11; node++)
                    if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
                        def_prob[node] = vp56_rac_gets_nn(c, 7);
                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
                    } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
                    }

    if (s->use_huffman) {
        for (pt=0; pt<2; pt++) {
            vp6_build_huff_tree(s, model->coeff_dccv[pt],
                                vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
            vp6_build_huff_tree(s, model->coeff_runv[pt],
                                vp6_huff_run_map, 9, &s->runv_vlc[pt]);
            for (ct=0; ct<3; ct++)
                for (cg = 0; cg < 6; cg++)
                    vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
                                        vp6_huff_coeff_map, 12,
                                        &s->ract_vlc[pt][ct][cg]);
        }
        memset(s->nb_null, 0, sizeof(s->nb_null));
    } else {
    /* coeff_dcct is a linear combination of coeff_dccv */
    for (pt=0; pt<2; pt++)
        for (ctx=0; ctx<3; ctx++)
            for (node=0; node<5; node++)
                model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
    }
}

static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
{
    VP56RangeCoder *c = &s->c;
    VP56Model *model = s->modelp;
    int comp;

    *vect = (VP56mv) {0,0};
    if (s->vector_candidate_pos < 2)
        *vect = s->vector_candidate[0];

    for (comp=0; comp<2; comp++) {
        int i, delta = 0;

        if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
            static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
            for (i=0; i<sizeof(prob_order); i++) {
                int j = prob_order[i];
                delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
            }
            if (delta & 0xF0)
                delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
            else
                delta |= 8;
        } else {
            delta = vp56_rac_get_tree(c, vp56_pva_tree,
                                      model->vector_pdv[comp]);
        }

        if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
            delta = -delta;

        if (!comp)
            vect->x += delta;
        else
            vect->y += delta;
    }
}

/**
 * Read number of consecutive blocks with null DC or AC.
 * This value is < 74.
 */
static unsigned vp6_get_nb_null(VP56Context *s)
{
    unsigned val = get_bits(&s->gb, 2);
    if (val == 2)
        val += get_bits(&s->gb, 2);
    else if (val == 3) {
        val = get_bits1(&s->gb) << 2;
        val = 6+val + get_bits(&s->gb, 2+val);
    }
    return val;
}

static void vp6_parse_coeff_huffman(VP56Context *s)
{
    VP56Model *model = s->modelp;
    uint8_t *permute = s->scantable.permutated;
    VLC *vlc_coeff;
    int coeff, sign, coeff_idx;
    int b, cg, idx;
    int pt = 0;    /* plane type (0 for Y, 1 for U or V) */

    for (b=0; b<6; b++) {
        int ct = 0;    /* code type */
        if (b > 3) pt = 1;
        vlc_coeff = &s->dccv_vlc[pt];

        for (coeff_idx=0; coeff_idx<64; ) {
            int run = 1;
            if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
                s->nb_null[coeff_idx][pt]--;
                if (coeff_idx)
                    break;
            } else {
                if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
                    return;
                coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
                if (coeff == 0) {
                    if (coeff_idx) {
                        int pt = (coeff_idx >= 6);
                        run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
                        if (run >= 9)
                            run += get_bits(&s->gb, 6);
                    } else
                        s->nb_null[0][pt] = vp6_get_nb_null(s);
                    ct = 0;
                } else if (coeff == 11) {  /* end of block */
                    if (coeff_idx == 1)    /* first AC coeff ? */
                        s->nb_null[1][pt] = vp6_get_nb_null(s);
                    break;
                } else {
                    int coeff2 = vp56_coeff_bias[coeff];
                    if (coeff > 4)
                        coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
                    ct = 1 + (coeff2 > 1);
                    sign = get_bits1(&s->gb);
                    coeff2 = (coeff2 ^ -sign) + sign;
                    if (coeff_idx)
                        coeff2 *= s->dequant_ac;
                    idx = model->coeff_index_to_pos[coeff_idx];
                    s->block_coeff[b][permute[idx]] = coeff2;
                }
            }
            coeff_idx+=run;
            cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
            vlc_coeff = &s->ract_vlc[pt][ct][cg];
        }
    }
}

static void vp6_parse_coeff(VP56Context *s)
{
    VP56RangeCoder *c = s->ccp;
    VP56Model *model = s->modelp;
    uint8_t *permute = s->scantable.permutated;
    uint8_t *model1, *model2, *model3;
    int coeff, sign, coeff_idx;
    int b, i, cg, idx, ctx;
    int pt = 0;    /* plane type (0 for Y, 1 for U or V) */

    for (b=0; b<6; b++) {
        int ct = 1;    /* code type */
        int run = 1;

        if (b > 3) pt = 1;

        ctx = s->left_block[vp56_b6to4[b]].not_null_dc
              + s->above_blocks[s->above_block_idx[b]].not_null_dc;
        model1 = model->coeff_dccv[pt];
        model2 = model->coeff_dcct[pt][ctx];

        for (coeff_idx=0; coeff_idx<64; ) {
            if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
                /* parse a coeff */
                if (vp56_rac_get_prob(c, model2[2])) {
                    if (vp56_rac_get_prob(c, model2[3])) {
                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
                        coeff = vp56_coeff_bias[idx+5];
                        for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
                            coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
                    } else {
                        if (vp56_rac_get_prob(c, model2[4]))
                            coeff = 3 + vp56_rac_get_prob(c, model1[5]);
                        else
                            coeff = 2;
                    }
                    ct = 2;
                } else {
                    ct = 1;
                    coeff = 1;
                }
                sign = vp56_rac_get(c);
                coeff = (coeff ^ -sign) + sign;
                if (coeff_idx)
                    coeff *= s->dequant_ac;
                idx = model->coeff_index_to_pos[coeff_idx];
                s->block_coeff[b][permute[idx]] = coeff;
                run = 1;
            } else {
                /* parse a run */
                ct = 0;
                if (coeff_idx > 0) {
                    if (!vp56_rac_get_prob(c, model2[1]))
                        break;

                    model3 = model->coeff_runv[coeff_idx >= 6];
                    run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
                    if (!run)
                        for (run=9, i=0; i<6; i++)
                            run += vp56_rac_get_prob(c, model3[i+8]) << i;
                }
            }

            cg = vp6_coeff_groups[coeff_idx+=run];
            model1 = model2 = model->coeff_ract[pt][ct][cg];
        }

        s->left_block[vp56_b6to4[b]].not_null_dc =
        s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
    }
}

static int vp6_adjust(int v, int t)
{
    int V = v, s = v >> 31;
    V ^= s;
    V -= s;
    if (V-t-1 >= (unsigned)(t-1))
        return v;
    V = 2*t - V;
    V += s;
    V ^= s;
    return V;
}

static int vp6_block_variance(uint8_t *src, int stride)
{
    int sum = 0, square_sum = 0;
    int y, x;

    for (y=0; y<8; y+=2) {
        for (x=0; x<8; x+=2) {
            sum += src[x];
            square_sum += src[x]*src[x];
        }
        src += 2*stride;
    }
    return (16*square_sum - sum*sum) >> 8;
}

static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
                           int delta, const int16_t *weights)
{
    int x, y;

    for (y=0; y<8; y++) {
        for (x=0; x<8; x++) {
            dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
                                 + src[x        ] * weights[1]
                                 + src[x+delta  ] * weights[2]
                                 + src[x+2*delta] * weights[3] + 64) >> 7);
        }
        src += stride;
        dst += stride;
    }
}

static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
                             int stride, int h_weight, int v_weight)
{
    uint8_t *tmp = s->edge_emu_buffer+16;
    s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
    s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
}

static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
                       int offset1, int offset2, int stride,
                       VP56mv mv, int mask, int select, int luma)
{
    int filter4 = 0;
    int x8 = mv.x & mask;
    int y8 = mv.y & mask;

    if (luma) {
        x8 *= 2;
        y8 *= 2;
        filter4 = s->filter_mode;
        if (filter4 == 2) {
            if (s->max_vector_length &&
                (FFABS(mv.x) > s->max_vector_length ||
                 FFABS(mv.y) > s->max_vector_length)) {
                filter4 = 0;
            } else if (s->sample_variance_threshold
                       && (vp6_block_variance(src+offset1, stride)
                           < s->sample_variance_threshold)) {
                filter4 = 0;
            }
        }
    }

    if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
        offset1 = offset2;
    }

    if (filter4) {
        if (!y8) {                      /* left or right combine */
            vp6_filter_hv4(dst, src+offset1, stride, 1,
                           vp6_block_copy_filter[select][x8]);
        } else if (!x8) {               /* above or below combine */
            vp6_filter_hv4(dst, src+offset1, stride, stride,
                           vp6_block_copy_filter[select][y8]);
        } else {
            s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
                             vp6_block_copy_filter[select][x8],
                             vp6_block_copy_filter[select][y8]);
        }
    } else {
        if (!x8 || !y8) {
            s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
        } else {
            vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
        }
    }
}

static av_cold int vp6_decode_init(AVCodecContext *avctx)
{
    VP56Context *s = avctx->priv_data;

    vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
                     avctx->codec->id == CODEC_ID_VP6A);
    s->vp56_coord_div = vp6_coord_div;
    s->parse_vector_adjustment = vp6_parse_vector_adjustment;
    s->adjust = vp6_adjust;
    s->filter = vp6_filter;
    s->default_models_init = vp6_default_models_init;
    s->parse_vector_models = vp6_parse_vector_models;
    s->parse_coeff_models = vp6_parse_coeff_models;
    s->parse_header = vp6_parse_header;

    return 0;
}

AVCodec vp6_decoder = {
    "vp6",
    CODEC_TYPE_VIDEO,
    CODEC_ID_VP6,
    sizeof(VP56Context),
    vp6_decode_init,
    NULL,
    vp56_free,
    vp56_decode_frame,
    CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
};

/* flash version, not flipped upside-down */
AVCodec vp6f_decoder = {
    "vp6f",
    CODEC_TYPE_VIDEO,
    CODEC_ID_VP6F,
    sizeof(VP56Context),
    vp6_decode_init,
    NULL,
    vp56_free,
    vp56_decode_frame,
    CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
};

/* flash version, not flipped upside-down, with alpha channel */
AVCodec vp6a_decoder = {
    "vp6a",
    CODEC_TYPE_VIDEO,
    CODEC_ID_VP6A,
    sizeof(VP56Context),
    vp6_decode_init,
    NULL,
    vp56_free,
    vp56_decode_frame,
    CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
};
Commit	Line	Data
5ce117c3	1	/**
bad5537e	2	* @file libavcodec/vp6.c
5ce117c3 AJ	3	* VP6 compatible video decoder
	4	*
	5	* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
	6	*
7b94177e DB	7	* The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
	8	* - upper 4bits: difference between encoded width and visible width
	9	* - lower 4bits: difference between encoded height and visible height
	10	*
b78e7197 DB	11	* This file is part of FFmpeg.
	12	*
	13	* FFmpeg is free software; you can redistribute it and/or
5ce117c3 AJ	14	* modify it under the terms of the GNU Lesser General Public
	15	* License as published by the Free Software Foundation; either
	16	* version 2.1 of the License, or (at your option) any later version.
	17	*
b78e7197	18	* FFmpeg is distributed in the hope that it will be useful,
5ce117c3 AJ	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	21	* Lesser General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU Lesser General Public
b78e7197	24	* License along with FFmpeg; if not, write to the Free Software
7b94177e	25	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
5ce117c3 AJ	26	*/
	27
	28	#include <stdlib.h>
5ce117c3 AJ	29
	30	#include "avcodec.h"
	31	#include "dsputil.h"
9106a698	32	#include "get_bits.h"
f28b1048	33	#include "huffman.h"
5ce117c3 AJ	34
	35	#include "vp56.h"
	36	#include "vp56data.h"
	37	#include "vp6data.h"
	38
	39
3d52bca6 AJ	40	static void vp6_parse_coeff(VP56Context *s);
3d52bca6 AJ	41	static void vp6_parse_coeff_huffman(VP56Context *s);
f28b1048	42
3d52bca6	43	static int vp6_parse_header(VP56Context s, const uint8_t buf, int buf_size,
5ce117c3 AJ	44	int *golden_frame)
5ce117c3 AJ	45	{
3d52bca6	46	VP56RangeCoder *c = &s->c;
9110a0e3	47	int parse_filter_info = 0;
dd9b8635	48	int coeff_offset = 0;
9110a0e3 AJ	49	int vrt_shift = 0;
9110a0e3 AJ	50	int sub_version;
5ce117c3 AJ	51	int rows, cols;
5ce117c3 AJ	52	int res = 1;
dd9b8635	53	int separated_coeff = buf[0] & 1;
5ce117c3	54
704a2881	55	s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
5ce117c3 AJ	56	vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
5ce117c3 AJ	57
704a2881	58	if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
9110a0e3 AJ	59	sub_version = buf[1] >> 3;
	60	if (sub_version > 8)
	61	return 0;
dd9b8635	62	s->filter_header = buf[1] & 0x06;
5ce117c3 AJ	63	if (buf[1] & 1) {
	64	av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
	65	return 0;
	66	}
dd9b8635	67	if (separated_coeff \|\| !s->filter_header) {
fead30d4	68	coeff_offset = AV_RB16(buf+2) - 2;
dd9b8635 AJ	69	buf += 2;
	70	buf_size -= 2;
	71	}
5ce117c3 AJ	72
	73	rows = buf[2]; /* number of stored macroblock rows */
	74	cols = buf[3]; /* number of stored macroblock cols */
	75	/* buf[4] is number of displayed macroblock rows */
	76	/* buf[5] is number of displayed macroblock cols */
	77
bf73801b AJ	78	if (!s->macroblocks \|\| /* first frame */
bf73801b AJ	79	16*cols != s->avctx->coded_width \|\|
5ce117c3 AJ	80	16*rows != s->avctx->coded_height) {
5ce117c3 AJ	81	avcodec_set_dimensions(s->avctx, 16cols, 16rows);
9e2424ce AJ	82	if (s->avctx->extradata_size == 1) {
	83	s->avctx->width -= s->avctx->extradata[0] >> 4;
	84	s->avctx->height -= s->avctx->extradata[0] & 0x0F;
	85	}
5ce117c3 AJ	86	res = 2;
	87	}
	88
	89	vp56_init_range_decoder(c, buf+6, buf_size-6);
	90	vp56_rac_gets(c, 2);
	91
dd9b8635	92	parse_filter_info = s->filter_header;
9110a0e3 AJ	93	if (sub_version < 8)
	94	vrt_shift = 5;
	95	s->sub_version = sub_version;
5ce117c3	96	} else {
9110a0e3 AJ	97	if (!s->sub_version)
	98	return 0;
	99
dd9b8635	100	if (separated_coeff \|\| !s->filter_header) {
fead30d4	101	coeff_offset = AV_RB16(buf+1) - 2;
dd9b8635 AJ	102	buf += 2;
	103	buf_size -= 2;
	104	}
5ce117c3 AJ	105	vp56_init_range_decoder(c, buf+1, buf_size-1);
	106
	107	*golden_frame = vp56_rac_get(c);
dd9b8635	108	if (s->filter_header) {
ae557450 AJ	109	s->deblock_filtering = vp56_rac_get(c);
	110	if (s->deblock_filtering)
	111	vp56_rac_get(c);
	112	if (s->sub_version > 7)
	113	parse_filter_info = vp56_rac_get(c);
dd9b8635	114	}
5ce117c3 AJ	115	}
	116
	117	if (parse_filter_info) {
	118	if (vp56_rac_get(c)) {
	119	s->filter_mode = 2;
9110a0e3	120	s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
5ce117c3 AJ	121	s->max_vector_length = 2 << vp56_rac_gets(c, 3);
	122	} else if (vp56_rac_get(c)) {
	123	s->filter_mode = 1;
	124	} else {
	125	s->filter_mode = 0;
	126	}
9110a0e3 AJ	127	if (s->sub_version > 7)
	128	s->filter_selection = vp56_rac_gets(c, 4);
	129	else
	130	s->filter_selection = 16;
5ce117c3 AJ	131	}
5ce117c3 AJ	132
f28b1048	133	s->use_huffman = vp56_rac_get(c);
dd9b8635	134
f28b1048	135	s->parse_coeff = vp6_parse_coeff;
dd9b8635	136	if (coeff_offset) {
f28b1048 AJ	137	buf += coeff_offset;
f28b1048 AJ	138	buf_size -= coeff_offset;
40056c32 AJ	139	if (buf_size < 0)
40056c32 AJ	140	return 0;
f28b1048 AJ	141	if (s->use_huffman) {
f28b1048 AJ	142	s->parse_coeff = vp6_parse_coeff_huffman;
713b0bff	143	init_get_bits(&s->gb, buf, buf_size<<3);
f28b1048 AJ	144	} else {
	145	vp56_init_range_decoder(&s->cc, buf, buf_size);
	146	s->ccp = &s->cc;
	147	}
dd9b8635 AJ	148	} else {
	149	s->ccp = &s->c;
	150	}
	151
5ce117c3 AJ	152	return res;
	153	}
	154
3d52bca6	155	static void vp6_coeff_order_table_init(VP56Context *s)
5ce117c3 AJ	156	{
	157	int i, pos, idx = 1;
	158
247df384	159	s->modelp->coeff_index_to_pos[0] = 0;
5ce117c3 AJ	160	for (i=0; i<16; i++)
5ce117c3 AJ	161	for (pos=1; pos<64; pos++)
247df384 AJ	162	if (s->modelp->coeff_reorder[pos] == i)
247df384 AJ	163	s->modelp->coeff_index_to_pos[idx++] = pos;
5ce117c3 AJ	164	}
5ce117c3 AJ	165
3d52bca6	166	static void vp6_default_models_init(VP56Context *s)
5ce117c3	167	{
d887151d	168	VP56Model *model = s->modelp;
5ce117c3	169
247df384 AJ	170	model->vector_dct[0] = 0xA2;
	171	model->vector_dct[1] = 0xA4;
	172	model->vector_sig[0] = 0x80;
	173	model->vector_sig[1] = 0x80;
	174
	175	memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
	176	memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
	177	memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
	178	memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
	179	memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
5ce117c3 AJ	180
	181	vp6_coeff_order_table_init(s);
	182	}
	183
3d52bca6	184	static void vp6_parse_vector_models(VP56Context *s)
5ce117c3	185	{
3d52bca6	186	VP56RangeCoder *c = &s->c;
d887151d	187	VP56Model *model = s->modelp;
5ce117c3 AJ	188	int comp, node;
	189
	190	for (comp=0; comp<2; comp++) {
	191	if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
247df384	192	model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
5ce117c3	193	if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
247df384	194	model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
5ce117c3 AJ	195	}
	196
	197	for (comp=0; comp<2; comp++)
	198	for (node=0; node<7; node++)
	199	if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
247df384	200	model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
5ce117c3 AJ	201
	202	for (comp=0; comp<2; comp++)
	203	for (node=0; node<8; node++)
	204	if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
247df384	205	model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
5ce117c3 AJ	206	}
5ce117c3 AJ	207
d47f1607	208	/* nodes must ascend by count, but with descending symbol order */
f28b1048 AJ	209	static int vp6_huff_cmp(const void va, const void vb)
	210	{
	211	const Node a = va, b = vb;
d47f1607	212	return (a->count - b->count)*16 + (b->sym - a->sym);
f28b1048 AJ	213	}
f28b1048 AJ	214
3d52bca6	215	static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
f28b1048 AJ	216	const uint8_t map, unsigned size, VLC vlc)
	217	{
	218	Node nodes[2size], tmp = &nodes[size];
	219	int a, b, i;
	220
	221	/* first compute probabilities from model */
	222	tmp[0].count = 256;
	223	for (i=0; i<size-1; i++) {
	224	a = tmp[i].count * coeff_model[i] >> 8;
	225	b = tmp[i].count * (255 - coeff_model[i]) >> 8;
	226	nodes[map[2*i ]].count = a + !a;
	227	nodes[map[2*i+1]].count = b + !b;
	228	}
	229
0a41faa9	230	free_vlc(vlc);
f28b1048	231	/* then build the huffman tree accodring to probabilities */
bac02ed3 AJ	232	ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
bac02ed3 AJ	233	FF_HUFFMAN_FLAG_HNODE_FIRST);
f28b1048 AJ	234	}
f28b1048 AJ	235
3d52bca6	236	static void vp6_parse_coeff_models(VP56Context *s)
5ce117c3	237	{
3d52bca6	238	VP56RangeCoder *c = &s->c;
d887151d	239	VP56Model *model = s->modelp;
5ce117c3 AJ	240	int def_prob[11];
	241	int node, cg, ctx, pos;
	242	int ct; /* code type */
	243	int pt; /* plane type (0 for Y, 1 for U or V) */
	244
	245	memset(def_prob, 0x80, sizeof(def_prob));
	246
	247	for (pt=0; pt<2; pt++)
	248	for (node=0; node<11; node++)
	249	if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
	250	def_prob[node] = vp56_rac_gets_nn(c, 7);
247df384	251	model->coeff_dccv[pt][node] = def_prob[node];
704a2881	252	} else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
247df384	253	model->coeff_dccv[pt][node] = def_prob[node];
5ce117c3 AJ	254	}
	255
	256	if (vp56_rac_get(c)) {
	257	for (pos=1; pos<64; pos++)
	258	if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
247df384	259	model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
5ce117c3 AJ	260	vp6_coeff_order_table_init(s);
	261	}
	262
	263	for (cg=0; cg<2; cg++)
	264	for (node=0; node<14; node++)
	265	if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
247df384	266	model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
5ce117c3 AJ	267
	268	for (ct=0; ct<3; ct++)
	269	for (pt=0; pt<2; pt++)
	270	for (cg=0; cg<6; cg++)
	271	for (node=0; node<11; node++)
	272	if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
	273	def_prob[node] = vp56_rac_gets_nn(c, 7);
247df384	274	model->coeff_ract[pt][ct][cg][node] = def_prob[node];
704a2881	275	} else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
247df384	276	model->coeff_ract[pt][ct][cg][node] = def_prob[node];
5ce117c3 AJ	277	}
5ce117c3 AJ	278
f28b1048 AJ	279	if (s->use_huffman) {
	280	for (pt=0; pt<2; pt++) {
	281	vp6_build_huff_tree(s, model->coeff_dccv[pt],
	282	vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
	283	vp6_build_huff_tree(s, model->coeff_runv[pt],
	284	vp6_huff_run_map, 9, &s->runv_vlc[pt]);
	285	for (ct=0; ct<3; ct++)
	286	for (cg = 0; cg < 6; cg++)
	287	vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
	288	vp6_huff_coeff_map, 12,
	289	&s->ract_vlc[pt][ct][cg]);
	290	}
	291	memset(s->nb_null, 0, sizeof(s->nb_null));
	292	} else {
247df384	293	/* coeff_dcct is a linear combination of coeff_dccv */
5ce117c3 AJ	294	for (pt=0; pt<2; pt++)
	295	for (ctx=0; ctx<3; ctx++)
	296	for (node=0; node<5; node++)
247df384	297	model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
f28b1048	298	}
5ce117c3 AJ	299	}
5ce117c3 AJ	300
3d52bca6	301	static void vp6_parse_vector_adjustment(VP56Context s, VP56mv vect)
5ce117c3	302	{
3d52bca6	303	VP56RangeCoder *c = &s->c;
d887151d	304	VP56Model *model = s->modelp;
5ce117c3 AJ	305	int comp;
5ce117c3 AJ	306
3d52bca6	307	*vect = (VP56mv) {0,0};
5ce117c3	308	if (s->vector_candidate_pos < 2)
d120e402	309	*vect = s->vector_candidate[0];
5ce117c3 AJ	310
	311	for (comp=0; comp<2; comp++) {
	312	int i, delta = 0;
	313
247df384	314	if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
5ce117c3 AJ	315	static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
	316	for (i=0; i<sizeof(prob_order); i++) {
	317	int j = prob_order[i];
247df384	318	delta \|= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
5ce117c3 AJ	319	}
5ce117c3 AJ	320	if (delta & 0xF0)
247df384	321	delta \|= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
5ce117c3 AJ	322	else
	323	delta \|= 8;
	324	} else {
	325	delta = vp56_rac_get_tree(c, vp56_pva_tree,
247df384	326	model->vector_pdv[comp]);
5ce117c3 AJ	327	}
5ce117c3 AJ	328
247df384	329	if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
5ce117c3 AJ	330	delta = -delta;
	331
	332	if (!comp)
d120e402	333	vect->x += delta;
5ce117c3	334	else
d120e402	335	vect->y += delta;
5ce117c3 AJ	336	}
	337	}
	338
f28b1048 AJ	339	/**
	340	* Read number of consecutive blocks with null DC or AC.
	341	* This value is < 74.
	342	*/
3d52bca6	343	static unsigned vp6_get_nb_null(VP56Context *s)
f28b1048 AJ	344	{
	345	unsigned val = get_bits(&s->gb, 2);
	346	if (val == 2)
	347	val += get_bits(&s->gb, 2);
	348	else if (val == 3) {
	349	val = get_bits1(&s->gb) << 2;
	350	val = 6+val + get_bits(&s->gb, 2+val);
	351	}
	352	return val;
	353	}
	354
3d52bca6	355	static void vp6_parse_coeff_huffman(VP56Context *s)
f28b1048	356	{
d887151d	357	VP56Model *model = s->modelp;
f28b1048 AJ	358	uint8_t *permute = s->scantable.permutated;
	359	VLC *vlc_coeff;
	360	int coeff, sign, coeff_idx;
	361	int b, cg, idx;
	362	int pt = 0; /* plane type (0 for Y, 1 for U or V) */
	363
	364	for (b=0; b<6; b++) {
	365	int ct = 0; /* code type */
	366	if (b > 3) pt = 1;
	367	vlc_coeff = &s->dccv_vlc[pt];
	368
	369	for (coeff_idx=0; coeff_idx<64; ) {
	370	int run = 1;
	371	if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
	372	s->nb_null[coeff_idx][pt]--;
	373	if (coeff_idx)
	374	break;
	375	} else {
ad921086 RD	376	if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
ad921086 RD	377	return;
f28b1048 AJ	378	coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
	379	if (coeff == 0) {
	380	if (coeff_idx) {
	381	int pt = (coeff_idx >= 6);
	382	run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
	383	if (run >= 9)
	384	run += get_bits(&s->gb, 6);
	385	} else
	386	s->nb_null[0][pt] = vp6_get_nb_null(s);
	387	ct = 0;
	388	} else if (coeff == 11) { /* end of block */
	389	if (coeff_idx == 1) /* first AC coeff ? */
	390	s->nb_null[1][pt] = vp6_get_nb_null(s);
	391	break;
	392	} else {
	393	int coeff2 = vp56_coeff_bias[coeff];
	394	if (coeff > 4)
	395	coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
	396	ct = 1 + (coeff2 > 1);
	397	sign = get_bits1(&s->gb);
	398	coeff2 = (coeff2 ^ -sign) + sign;
	399	if (coeff_idx)
	400	coeff2 *= s->dequant_ac;
	401	idx = model->coeff_index_to_pos[coeff_idx];
	402	s->block_coeff[b][permute[idx]] = coeff2;
	403	}
	404	}
	405	coeff_idx+=run;
	406	cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
	407	vlc_coeff = &s->ract_vlc[pt][ct][cg];
	408	}
	409	}
	410	}
	411
3d52bca6	412	static void vp6_parse_coeff(VP56Context *s)
5ce117c3	413	{
3d52bca6	414	VP56RangeCoder *c = s->ccp;
d887151d	415	VP56Model *model = s->modelp;
5ce117c3	416	uint8_t *permute = s->scantable.permutated;
247df384	417	uint8_t model1, model2, *model3;
5ce117c3 AJ	418	int coeff, sign, coeff_idx;
	419	int b, i, cg, idx, ctx;
	420	int pt = 0; /* plane type (0 for Y, 1 for U or V) */
	421
	422	for (b=0; b<6; b++) {
	423	int ct = 1; /* code type */
	424	int run = 1;
	425
	426	if (b > 3) pt = 1;
	427
	428	ctx = s->left_block[vp56_b6to4[b]].not_null_dc
	429	+ s->above_blocks[s->above_block_idx[b]].not_null_dc;
247df384 AJ	430	model1 = model->coeff_dccv[pt];
247df384 AJ	431	model2 = model->coeff_dcct[pt][ctx];
5ce117c3 AJ	432
	433	for (coeff_idx=0; coeff_idx<64; ) {
	434	if ((coeff_idx>1 && ct==0) \|\| vp56_rac_get_prob(c, model2[0])) {
	435	/* parse a coeff */
5ce117c3 AJ	436	if (vp56_rac_get_prob(c, model2[2])) {
5ce117c3 AJ	437	if (vp56_rac_get_prob(c, model2[3])) {
247df384	438	idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
f28b1048	439	coeff = vp56_coeff_bias[idx+5];
5ce117c3 AJ	440	for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
	441	coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
	442	} else {
	443	if (vp56_rac_get_prob(c, model2[4]))
247df384	444	coeff = 3 + vp56_rac_get_prob(c, model1[5]);
5ce117c3 AJ	445	else
	446	coeff = 2;
	447	}
	448	ct = 2;
	449	} else {
	450	ct = 1;
	451	coeff = 1;
	452	}
	453	sign = vp56_rac_get(c);
	454	coeff = (coeff ^ -sign) + sign;
	455	if (coeff_idx)
	456	coeff *= s->dequant_ac;
247df384	457	idx = model->coeff_index_to_pos[coeff_idx];
5ce117c3 AJ	458	s->block_coeff[b][permute[idx]] = coeff;
	459	run = 1;
	460	} else {
	461	/* parse a run */
	462	ct = 0;
4b8419aa	463	if (coeff_idx > 0) {
5ce117c3 AJ	464	if (!vp56_rac_get_prob(c, model2[1]))
	465	break;
	466
247df384	467	model3 = model->coeff_runv[coeff_idx >= 6];
5ce117c3 AJ	468	run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
	469	if (!run)
	470	for (run=9, i=0; i<6; i++)
	471	run += vp56_rac_get_prob(c, model3[i+8]) << i;
	472	}
	473	}
	474
	475	cg = vp6_coeff_groups[coeff_idx+=run];
247df384	476	model1 = model2 = model->coeff_ract[pt][ct][cg];
5ce117c3	477	}
4b8419aa LM	478
	479	s->left_block[vp56_b6to4[b]].not_null_dc =
	480	s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
5ce117c3 AJ	481	}
	482	}
	483
	484	static int vp6_adjust(int v, int t)
	485	{
	486	int V = v, s = v >> 31;
	487	V ^= s;
	488	V -= s;
	489	if (V-t-1 >= (unsigned)(t-1))
	490	return v;
	491	V = 2*t - V;
	492	V += s;
	493	V ^= s;
	494	return V;
	495	}
	496
	497	static int vp6_block_variance(uint8_t *src, int stride)
	498	{
	499	int sum = 0, square_sum = 0;
	500	int y, x;
	501
	502	for (y=0; y<8; y+=2) {
	503	for (x=0; x<8; x+=2) {
	504	sum += src[x];
	505	square_sum += src[x]*src[x];
	506	}
	507	src += 2*stride;
	508	}
c29ff23c	509	return (16square_sum - sumsum) >> 8;
5ce117c3 AJ	510	}
5ce117c3 AJ	511
5ce117c3 AJ	512	static void vp6_filter_hv4(uint8_t dst, uint8_t src, int stride,
	513	int delta, const int16_t *weights)
	514	{
	515	int x, y;
	516
	517	for (y=0; y<8; y++) {
	518	for (x=0; x<8; x++) {
f66e4f5f	519	dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
5ce117c3 AJ	520	+ src[x ] * weights[1]
	521	+ src[x+delta ] * weights[2]
	522	+ src[x+2delta] weights[3] + 64) >> 7);
	523	}
	524	src += stride;
	525	dst += stride;
	526	}
	527	}
	528
3d52bca6	529	static void vp6_filter_diag2(VP56Context s, uint8_t dst, uint8_t *src,
5ce117c3 AJ	530	int stride, int h_weight, int v_weight)
	531	{
	532	uint8_t *tmp = s->edge_emu_buffer+16;
6ec48185 LM	533	s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
6ec48185 LM	534	s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
5ce117c3 AJ	535	}
5ce117c3 AJ	536
3d52bca6	537	static void vp6_filter(VP56Context s, uint8_t dst, uint8_t *src,
5ce117c3	538	int offset1, int offset2, int stride,
3d52bca6	539	VP56mv mv, int mask, int select, int luma)
5ce117c3 AJ	540	{
	541	int filter4 = 0;
	542	int x8 = mv.x & mask;
	543	int y8 = mv.y & mask;
	544
	545	if (luma) {
	546	x8 *= 2;
	547	y8 *= 2;
	548	filter4 = s->filter_mode;
	549	if (filter4 == 2) {
	550	if (s->max_vector_length &&
c26abfa5 DB	551	(FFABS(mv.x) > s->max_vector_length \|\|
c26abfa5 DB	552	FFABS(mv.y) > s->max_vector_length)) {
5ce117c3	553	filter4 = 0;
9110a0e3 AJ	554	} else if (s->sample_variance_threshold
9110a0e3 AJ	555	&& (vp6_block_variance(src+offset1, stride)
5ce117c3 AJ	556	< s->sample_variance_threshold)) {
	557	filter4 = 0;
	558	}
	559	}
	560	}
	561
	562	if ((y8 && (offset2-offset1)*s->flip<0) \|\| (!y8 && offset1 > offset2)) {
	563	offset1 = offset2;
	564	}
	565
	566	if (filter4) {
	567	if (!y8) { /* left or right combine */
	568	vp6_filter_hv4(dst, src+offset1, stride, 1,
	569	vp6_block_copy_filter[select][x8]);
	570	} else if (!x8) { /* above or below combine */
	571	vp6_filter_hv4(dst, src+offset1, stride, stride,
	572	vp6_block_copy_filter[select][y8]);
cd66ddb6	573	} else {
26f3ae82	574	s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
5ce117c3 AJ	575	vp6_block_copy_filter[select][x8],
	576	vp6_block_copy_filter[select][y8]);
	577	}
	578	} else {
6ec48185 LM	579	if (!x8 \|\| !y8) {
6ec48185 LM	580	s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
cd66ddb6 LM	581	} else {
cd66ddb6 LM	582	vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
5ce117c3 AJ	583	}
	584	}
	585	}
	586
98a6fff9	587	static av_cold int vp6_decode_init(AVCodecContext *avctx)
5ce117c3	588	{
3d52bca6	589	VP56Context *s = avctx->priv_data;
5ce117c3	590
91fc2cf1 AJ	591	vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
91fc2cf1 AJ	592	avctx->codec->id == CODEC_ID_VP6A);
5ce117c3 AJ	593	s->vp56_coord_div = vp6_coord_div;
	594	s->parse_vector_adjustment = vp6_parse_vector_adjustment;
	595	s->adjust = vp6_adjust;
	596	s->filter = vp6_filter;
5ce117c3 AJ	597	s->default_models_init = vp6_default_models_init;
	598	s->parse_vector_models = vp6_parse_vector_models;
	599	s->parse_coeff_models = vp6_parse_coeff_models;
	600	s->parse_header = vp6_parse_header;
	601
	602	return 0;
	603	}
	604
	605	AVCodec vp6_decoder = {
	606	"vp6",
	607	CODEC_TYPE_VIDEO,
	608	CODEC_ID_VP6,
3d52bca6	609	sizeof(VP56Context),
5ce117c3 AJ	610	vp6_decode_init,
	611	NULL,
	612	vp56_free,
	613	vp56_decode_frame,
75f6cc26	614	CODEC_CAP_DR1,
fe4bf374	615	.long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
5ce117c3 AJ	616	};
	617
	618	/* flash version, not flipped upside-down */
	619	AVCodec vp6f_decoder = {
	620	"vp6f",
	621	CODEC_TYPE_VIDEO,
	622	CODEC_ID_VP6F,
3d52bca6	623	sizeof(VP56Context),
5ce117c3 AJ	624	vp6_decode_init,
	625	NULL,
	626	vp56_free,
	627	vp56_decode_frame,
75f6cc26	628	CODEC_CAP_DR1,
fe4bf374	629	.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
5ce117c3	630	};
91fc2cf1 AJ	631
	632	/* flash version, not flipped upside-down, with alpha channel */
	633	AVCodec vp6a_decoder = {
	634	"vp6a",
	635	CODEC_TYPE_VIDEO,
	636	CODEC_ID_VP6A,
3d52bca6	637	sizeof(VP56Context),
91fc2cf1 AJ	638	vp6_decode_init,
	639	NULL,
	640	vp56_free,
	641	vp56_decode_frame,
	642	CODEC_CAP_DR1,
fe4bf374	643	.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
91fc2cf1	644	};