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/**
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 * @file libavcodec/vp56.c
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 * VP5 and VP6 compatible video decoder (common features)
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 *
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 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avcodec.h"
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#include "bytestream.h"
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27
#include "vp56.h"
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#include "vp56data.h"
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30

    
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void vp56_init_dequant(VP56Context *s, int quantizer)
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{
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    s->quantizer = quantizer;
34
    s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
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    s->dequant_ac = vp56_ac_dequant[quantizer] << 2;
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    memset(s->qscale_table, quantizer, s->mb_width);
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}
38

    
39
static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,
40
                                       VP56Frame ref_frame)
41
{
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    int nb_pred = 0;
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    VP56mv vect[2] = {{0,0}, {0,0}};
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    int pos, offset;
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    VP56mv mvp;
46

    
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    for (pos=0; pos<12; pos++) {
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        mvp.x = col + vp56_candidate_predictor_pos[pos][0];
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        mvp.y = row + vp56_candidate_predictor_pos[pos][1];
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        if (mvp.x < 0 || mvp.x >= s->mb_width ||
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            mvp.y < 0 || mvp.y >= s->mb_height)
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            continue;
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        offset = mvp.x + s->mb_width*mvp.y;
54

    
55
        if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
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            continue;
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        if ((s->macroblocks[offset].mv.x == vect[0].x &&
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             s->macroblocks[offset].mv.y == vect[0].y) ||
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            (s->macroblocks[offset].mv.x == 0 &&
60
             s->macroblocks[offset].mv.y == 0))
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            continue;
62

    
63
        vect[nb_pred++] = s->macroblocks[offset].mv;
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        if (nb_pred > 1) {
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            nb_pred = -1;
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            break;
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        }
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        s->vector_candidate_pos = pos;
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    }
70

    
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    s->vector_candidate[0] = vect[0];
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    s->vector_candidate[1] = vect[1];
73

    
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    return nb_pred+1;
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}
76

    
77
static void vp56_parse_mb_type_models(VP56Context *s)
78
{
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    VP56RangeCoder *c = &s->c;
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    VP56Model *model = s->modelp;
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    int i, ctx, type;
82

    
83
    for (ctx=0; ctx<3; ctx++) {
84
        if (vp56_rac_get_prob(c, 174)) {
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            int idx = vp56_rac_gets(c, 4);
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            memcpy(model->mb_types_stats[ctx],
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                   vp56_pre_def_mb_type_stats[idx][ctx],
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                   sizeof(model->mb_types_stats[ctx]));
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        }
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        if (vp56_rac_get_prob(c, 254)) {
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            for (type=0; type<10; type++) {
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                for(i=0; i<2; i++) {
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                    if (vp56_rac_get_prob(c, 205)) {
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                        int delta, sign = vp56_rac_get(c);
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                        delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
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                                                  vp56_mb_type_model_model);
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                        if (!delta)
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                            delta = 4 * vp56_rac_gets(c, 7);
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                        model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
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                    }
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                }
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            }
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        }
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    }
106

    
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    /* compute MB type probability tables based on previous MB type */
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    for (ctx=0; ctx<3; ctx++) {
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        int p[10];
110

    
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        for (type=0; type<10; type++)
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            p[type] = 100 * model->mb_types_stats[ctx][type][1];
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        for (type=0; type<10; type++) {
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            int p02, p34, p0234, p17, p56, p89, p5689, p156789;
116

    
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            /* conservative MB type probability */
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            model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);
119

    
120
            p[type] = 0;    /* same MB type => weight is null */
121

    
122
            /* binary tree parsing probabilities */
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            p02 = p[0] + p[2];
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            p34 = p[3] + p[4];
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            p0234 = p02 + p34;
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            p17 = p[1] + p[7];
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            p56 = p[5] + p[6];
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            p89 = p[8] + p[9];
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            p5689 = p56 + p89;
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            p156789 = p17 + p5689;
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132
            model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
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            model->mb_type[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
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            model->mb_type[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
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            model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
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            model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
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            model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
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            model->mb_type[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
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            model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
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            model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
141

    
142
            /* restore initial value */
143
            p[type] = 100 * model->mb_types_stats[ctx][type][1];
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        }
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    }
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}
147

    
148
static VP56mb vp56_parse_mb_type(VP56Context *s,
149
                                 VP56mb prev_type, int ctx)
150
{
151
    uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
152
    VP56RangeCoder *c = &s->c;
153

    
154
    if (vp56_rac_get_prob(c, mb_type_model[0]))
155
        return prev_type;
156
    else
157
        return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
158
}
159

    
160
static void vp56_decode_4mv(VP56Context *s, int row, int col)
161
{
162
    VP56mv mv = {0,0};
163
    int type[4];
164
    int b;
165

    
166
    /* parse each block type */
167
    for (b=0; b<4; b++) {
168
        type[b] = vp56_rac_gets(&s->c, 2);
169
        if (type[b])
170
            type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */
171
    }
172

    
173
    /* get vectors */
174
    for (b=0; b<4; b++) {
175
        switch (type[b]) {
176
            case VP56_MB_INTER_NOVEC_PF:
177
                s->mv[b] = (VP56mv) {0,0};
178
                break;
179
            case VP56_MB_INTER_DELTA_PF:
180
                s->parse_vector_adjustment(s, &s->mv[b]);
181
                break;
182
            case VP56_MB_INTER_V1_PF:
183
                s->mv[b] = s->vector_candidate[0];
184
                break;
185
            case VP56_MB_INTER_V2_PF:
186
                s->mv[b] = s->vector_candidate[1];
187
                break;
188
        }
189
        mv.x += s->mv[b].x;
190
        mv.y += s->mv[b].y;
191
    }
192

    
193
    /* this is the one selected for the whole MB for prediction */
194
    s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
195

    
196
    /* chroma vectors are average luma vectors */
197
    if (s->avctx->codec->id == CODEC_ID_VP5) {
198
        s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
199
        s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
200
    } else {
201
        s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
202
    }
203
}
204

    
205
static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
206
{
207
    VP56mv *mv, vect = {0,0};
208
    int ctx, b;
209

    
210
    ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
211
    s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
212
    s->macroblocks[row * s->mb_width + col].type = s->mb_type;
213

    
214
    switch (s->mb_type) {
215
        case VP56_MB_INTER_V1_PF:
216
            mv = &s->vector_candidate[0];
217
            break;
218

    
219
        case VP56_MB_INTER_V2_PF:
220
            mv = &s->vector_candidate[1];
221
            break;
222

    
223
        case VP56_MB_INTER_V1_GF:
224
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
225
            mv = &s->vector_candidate[0];
226
            break;
227

    
228
        case VP56_MB_INTER_V2_GF:
229
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
230
            mv = &s->vector_candidate[1];
231
            break;
232

    
233
        case VP56_MB_INTER_DELTA_PF:
234
            s->parse_vector_adjustment(s, &vect);
235
            mv = &vect;
236
            break;
237

    
238
        case VP56_MB_INTER_DELTA_GF:
239
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
240
            s->parse_vector_adjustment(s, &vect);
241
            mv = &vect;
242
            break;
243

    
244
        case VP56_MB_INTER_4V:
245
            vp56_decode_4mv(s, row, col);
246
            return s->mb_type;
247

    
248
        default:
249
            mv = &vect;
250
            break;
251
    }
252

    
253
    s->macroblocks[row*s->mb_width + col].mv = *mv;
254

    
255
    /* same vector for all blocks */
256
    for (b=0; b<6; b++)
257
        s->mv[b] = *mv;
258

    
259
    return s->mb_type;
260
}
261

    
262
static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
263
{
264
    int idx = s->scantable.permutated[0];
265
    int b;
266

    
267
    for (b=0; b<6; b++) {
268
        VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];
269
        VP56RefDc *lb = &s->left_block[vp56_b6to4[b]];
270
        int count = 0;
271
        int dc = 0;
272
        int i;
273

    
274
        if (ref_frame == lb->ref_frame) {
275
            dc += lb->dc_coeff;
276
            count++;
277
        }
278
        if (ref_frame == ab->ref_frame) {
279
            dc += ab->dc_coeff;
280
            count++;
281
        }
282
        if (s->avctx->codec->id == CODEC_ID_VP5)
283
            for (i=0; i<2; i++)
284
                if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {
285
                    dc += ab[-1+2*i].dc_coeff;
286
                    count++;
287
                }
288
        if (count == 0)
289
            dc = s->prev_dc[vp56_b2p[b]][ref_frame];
290
        else if (count == 2)
291
            dc /= 2;
292

    
293
        s->block_coeff[b][idx] += dc;
294
        s->prev_dc[vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];
295
        ab->dc_coeff = s->block_coeff[b][idx];
296
        ab->ref_frame = ref_frame;
297
        lb->dc_coeff = s->block_coeff[b][idx];
298
        lb->ref_frame = ref_frame;
299
        s->block_coeff[b][idx] *= s->dequant_dc;
300
    }
301
}
302

    
303
static void vp56_edge_filter(VP56Context *s, uint8_t *yuv,
304
                             int pix_inc, int line_inc, int t)
305
{
306
    int pix2_inc = 2 * pix_inc;
307
    int i, v;
308

    
309
    for (i=0; i<12; i++) {
310
        v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4) >>3;
311
        v = s->adjust(v, t);
312
        yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);
313
        yuv[0] = av_clip_uint8(yuv[0] - v);
314
        yuv += line_inc;
315
    }
316
}
317

    
318
static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,
319
                                int stride, int dx, int dy)
320
{
321
    int t = vp56_filter_threshold[s->quantizer];
322
    if (dx)  vp56_edge_filter(s, yuv +         10-dx ,      1, stride, t);
323
    if (dy)  vp56_edge_filter(s, yuv + stride*(10-dy), stride,      1, t);
324
}
325

    
326
static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
327
                    int stride, int x, int y)
328
{
329
    uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];
330
    uint8_t *src_block;
331
    int src_offset;
332
    int overlap_offset = 0;
333
    int mask = s->vp56_coord_div[b] - 1;
334
    int deblock_filtering = s->deblock_filtering;
335
    int dx;
336
    int dy;
337

    
338
    if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
339
        (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
340
         && !s->framep[VP56_FRAME_CURRENT]->key_frame))
341
        deblock_filtering = 0;
342

    
343
    dx = s->mv[b].x / s->vp56_coord_div[b];
344
    dy = s->mv[b].y / s->vp56_coord_div[b];
345

    
346
    if (b >= 4) {
347
        x /= 2;
348
        y /= 2;
349
    }
350
    x += dx - 2;
351
    y += dy - 2;
352

    
353
    if (x<0 || x+12>=s->plane_width[plane] ||
354
        y<0 || y+12>=s->plane_height[plane]) {
355
        ff_emulated_edge_mc(s->edge_emu_buffer,
356
                            src + s->block_offset[b] + (dy-2)*stride + (dx-2),
357
                            stride, 12, 12, x, y,
358
                            s->plane_width[plane],
359
                            s->plane_height[plane]);
360
        src_block = s->edge_emu_buffer;
361
        src_offset = 2 + 2*stride;
362
    } else if (deblock_filtering) {
363
        /* only need a 12x12 block, but there is no such dsp function, */
364
        /* so copy a 16x12 block */
365
        s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
366
                                    src + s->block_offset[b] + (dy-2)*stride + (dx-2),
367
                                    stride, 12);
368
        src_block = s->edge_emu_buffer;
369
        src_offset = 2 + 2*stride;
370
    } else {
371
        src_block = src;
372
        src_offset = s->block_offset[b] + dy*stride + dx;
373
    }
374

    
375
    if (deblock_filtering)
376
        vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
377

    
378
    if (s->mv[b].x & mask)
379
        overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
380
    if (s->mv[b].y & mask)
381
        overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
382

    
383
    if (overlap_offset) {
384
        if (s->filter)
385
            s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
386
                      stride, s->mv[b], mask, s->filter_selection, b<4);
387
        else
388
            s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
389
                                           src_block+src_offset+overlap_offset,
390
                                           stride, 8);
391
    } else {
392
        s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
393
    }
394
}
395

    
396
static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
397
{
398
    AVFrame *frame_current, *frame_ref;
399
    VP56mb mb_type;
400
    VP56Frame ref_frame;
401
    int b, ab, b_max, plane, off;
402

    
403
    if (s->framep[VP56_FRAME_CURRENT]->key_frame)
404
        mb_type = VP56_MB_INTRA;
405
    else
406
        mb_type = vp56_decode_mv(s, row, col);
407
    ref_frame = vp56_reference_frame[mb_type];
408

    
409
    s->dsp.clear_blocks(*s->block_coeff);
410

    
411
    s->parse_coeff(s);
412

    
413
    vp56_add_predictors_dc(s, ref_frame);
414

    
415
    frame_current = s->framep[VP56_FRAME_CURRENT];
416
    frame_ref = s->framep[ref_frame];
417

    
418
    ab = 6*is_alpha;
419
    b_max = 6 - 2*is_alpha;
420

    
421
    switch (mb_type) {
422
        case VP56_MB_INTRA:
423
            for (b=0; b<b_max; b++) {
424
                plane = vp56_b2p[b+ab];
425
                s->dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
426
                                s->stride[plane], s->block_coeff[b]);
427
            }
428
            break;
429

    
430
        case VP56_MB_INTER_NOVEC_PF:
431
        case VP56_MB_INTER_NOVEC_GF:
432
            for (b=0; b<b_max; b++) {
433
                plane = vp56_b2p[b+ab];
434
                off = s->block_offset[b];
435
                s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
436
                                            frame_ref->data[plane] + off,
437
                                            s->stride[plane], 8);
438
                s->dsp.idct_add(frame_current->data[plane] + off,
439
                                s->stride[plane], s->block_coeff[b]);
440
            }
441
            break;
442

    
443
        case VP56_MB_INTER_DELTA_PF:
444
        case VP56_MB_INTER_V1_PF:
445
        case VP56_MB_INTER_V2_PF:
446
        case VP56_MB_INTER_DELTA_GF:
447
        case VP56_MB_INTER_4V:
448
        case VP56_MB_INTER_V1_GF:
449
        case VP56_MB_INTER_V2_GF:
450
            for (b=0; b<b_max; b++) {
451
                int x_off = b==1 || b==3 ? 8 : 0;
452
                int y_off = b==2 || b==3 ? 8 : 0;
453
                plane = vp56_b2p[b+ab];
454
                vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
455
                        16*col+x_off, 16*row+y_off);
456
                s->dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
457
                                s->stride[plane], s->block_coeff[b]);
458
            }
459
            break;
460
    }
461
}
462

    
463
static int vp56_size_changed(AVCodecContext *avctx)
464
{
465
    VP56Context *s = avctx->priv_data;
466
    int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
467
    int i;
468

    
469
    s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;
470
    s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;
471
    s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
472
    s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
473

    
474
    for (i=0; i<4; i++)
475
        s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
476

    
477
    s->mb_width  = (avctx->coded_width +15) / 16;
478
    s->mb_height = (avctx->coded_height+15) / 16;
479

    
480
    if (s->mb_width > 1000 || s->mb_height > 1000) {
481
        av_log(avctx, AV_LOG_ERROR, "picture too big\n");
482
        return -1;
483
    }
484

    
485
    s->qscale_table = av_realloc(s->qscale_table, s->mb_width);
486
    s->above_blocks = av_realloc(s->above_blocks,
487
                                 (4*s->mb_width+6) * sizeof(*s->above_blocks));
488
    s->macroblocks = av_realloc(s->macroblocks,
489
                                s->mb_width*s->mb_height*sizeof(*s->macroblocks));
490
    av_free(s->edge_emu_buffer_alloc);
491
    s->edge_emu_buffer_alloc = av_malloc(16*stride);
492
    s->edge_emu_buffer = s->edge_emu_buffer_alloc;
493
    if (s->flip < 0)
494
        s->edge_emu_buffer += 15 * stride;
495

    
496
    return 0;
497
}
498

    
499
int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
500
                      AVPacket *avpkt)
501
{
502
    const uint8_t *buf = avpkt->data;
503
    VP56Context *s = avctx->priv_data;
504
    AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
505
    int remaining_buf_size = avpkt->size;
506
    int is_alpha, av_uninit(alpha_offset);
507

    
508
    if (s->has_alpha) {
509
        if (remaining_buf_size < 3)
510
            return -1;
511
        alpha_offset = bytestream_get_be24(&buf);
512
        remaining_buf_size -= 3;
513
        if (remaining_buf_size < alpha_offset)
514
            return -1;
515
    }
516

    
517
    for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
518
        int mb_row, mb_col, mb_row_flip, mb_offset = 0;
519
        int block, y, uv, stride_y, stride_uv;
520
        int golden_frame = 0;
521
        int res;
522

    
523
        s->modelp = &s->models[is_alpha];
524

    
525
        res = s->parse_header(s, buf, remaining_buf_size, &golden_frame);
526
        if (!res)
527
            return -1;
528

    
529
        if (!is_alpha) {
530
            p->reference = 1;
531
            if (avctx->get_buffer(avctx, p) < 0) {
532
                av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
533
                return -1;
534
            }
535

    
536
            if (res == 2)
537
                if (vp56_size_changed(avctx)) {
538
                    avctx->release_buffer(avctx, p);
539
                    return -1;
540
                }
541
        }
542

    
543
        if (p->key_frame) {
544
            p->pict_type = FF_I_TYPE;
545
            s->default_models_init(s);
546
            for (block=0; block<s->mb_height*s->mb_width; block++)
547
                s->macroblocks[block].type = VP56_MB_INTRA;
548
        } else {
549
            p->pict_type = FF_P_TYPE;
550
            vp56_parse_mb_type_models(s);
551
            s->parse_vector_models(s);
552
            s->mb_type = VP56_MB_INTER_NOVEC_PF;
553
        }
554

    
555
        s->parse_coeff_models(s);
556

    
557
        memset(s->prev_dc, 0, sizeof(s->prev_dc));
558
        s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
559
        s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
560

    
561
        for (block=0; block < 4*s->mb_width+6; block++) {
562
            s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
563
            s->above_blocks[block].dc_coeff = 0;
564
            s->above_blocks[block].not_null_dc = 0;
565
        }
566
        s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
567
        s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
568

    
569
        stride_y  = p->linesize[0];
570
        stride_uv = p->linesize[1];
571

    
572
        if (s->flip < 0)
573
            mb_offset = 7;
574

    
575
        /* main macroblocks loop */
576
        for (mb_row=0; mb_row<s->mb_height; mb_row++) {
577
            if (s->flip < 0)
578
                mb_row_flip = s->mb_height - mb_row - 1;
579
            else
580
                mb_row_flip = mb_row;
581

    
582
            for (block=0; block<4; block++) {
583
                s->left_block[block].ref_frame = VP56_FRAME_NONE;
584
                s->left_block[block].dc_coeff = 0;
585
                s->left_block[block].not_null_dc = 0;
586
            }
587
            memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
588
            memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
589

    
590
            s->above_block_idx[0] = 1;
591
            s->above_block_idx[1] = 2;
592
            s->above_block_idx[2] = 1;
593
            s->above_block_idx[3] = 2;
594
            s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
595
            s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
596

    
597
            s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
598
            s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
599
            s->block_offset[1] = s->block_offset[0] + 8;
600
            s->block_offset[3] = s->block_offset[2] + 8;
601
            s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
602
            s->block_offset[5] = s->block_offset[4];
603

    
604
            for (mb_col=0; mb_col<s->mb_width; mb_col++) {
605
                vp56_decode_mb(s, mb_row, mb_col, is_alpha);
606

    
607
                for (y=0; y<4; y++) {
608
                    s->above_block_idx[y] += 2;
609
                    s->block_offset[y] += 16;
610
                }
611

    
612
                for (uv=4; uv<6; uv++) {
613
                    s->above_block_idx[uv] += 1;
614
                    s->block_offset[uv] += 8;
615
                }
616
            }
617
        }
618

    
619
        if (p->key_frame || golden_frame) {
620
            if (s->framep[VP56_FRAME_GOLDEN]->data[0] &&
621
                s->framep[VP56_FRAME_GOLDEN] != s->framep[VP56_FRAME_GOLDEN2])
622
                avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
623
            s->framep[VP56_FRAME_GOLDEN] = p;
624
        }
625

    
626
        if (s->has_alpha) {
627
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN],
628
                              s->framep[VP56_FRAME_GOLDEN2]);
629
            buf += alpha_offset;
630
            remaining_buf_size -= alpha_offset;
631
        }
632
    }
633

    
634
    if (s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN] ||
635
        s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN2]) {
636
        if (s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN] &&
637
            s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN2])
638
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
639
                              s->framep[VP56_FRAME_UNUSED]);
640
        else
641
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
642
                              s->framep[VP56_FRAME_UNUSED2]);
643
    } else if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
644
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
645
    FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
646
                      s->framep[VP56_FRAME_PREVIOUS]);
647

    
648
    p->qstride = 0;
649
    p->qscale_table = s->qscale_table;
650
    p->qscale_type = FF_QSCALE_TYPE_VP56;
651
    *(AVFrame*)data = *p;
652
    *data_size = sizeof(AVFrame);
653

    
654
    return avpkt->size;
655
}
656

    
657
av_cold void vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
658
{
659
    VP56Context *s = avctx->priv_data;
660
    int i;
661

    
662
    s->avctx = avctx;
663
    avctx->pix_fmt = has_alpha ? PIX_FMT_YUVA420P : PIX_FMT_YUV420P;
664

    
665
    if (avctx->idct_algo == FF_IDCT_AUTO)
666
        avctx->idct_algo = FF_IDCT_VP3;
667
    dsputil_init(&s->dsp, avctx);
668
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
669

    
670
    for (i=0; i<4; i++)
671
        s->framep[i] = &s->frames[i];
672
    s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
673
    s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];
674
    s->edge_emu_buffer_alloc = NULL;
675

    
676
    s->above_blocks = NULL;
677
    s->macroblocks = NULL;
678
    s->quantizer = -1;
679
    s->deblock_filtering = 1;
680

    
681
    s->filter = NULL;
682

    
683
    s->has_alpha = has_alpha;
684
    if (flip) {
685
        s->flip = -1;
686
        s->frbi = 2;
687
        s->srbi = 0;
688
    } else {
689
        s->flip = 1;
690
        s->frbi = 0;
691
        s->srbi = 2;
692
    }
693
}
694

    
695
av_cold int vp56_free(AVCodecContext *avctx)
696
{
697
    VP56Context *s = avctx->priv_data;
698

    
699
    av_freep(&s->qscale_table);
700
    av_freep(&s->above_blocks);
701
    av_freep(&s->macroblocks);
702
    av_freep(&s->edge_emu_buffer_alloc);
703
    if (s->framep[VP56_FRAME_GOLDEN]->data[0])
704
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
705
    if (s->framep[VP56_FRAME_GOLDEN2]->data[0])
706
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN2]);
707
    if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
708
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
709
    return 0;
710
}