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/**
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 * @file
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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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#include "vp56.h"
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#include "vp56data.h"
29

    
30

    
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void ff_vp56_init_dequant(VP56Context *s, int quantizer)
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{
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    s->quantizer = quantizer;
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    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,
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                                       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) ||
59
            (s->macroblocks[offset].mv.x == 0 &&
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             s->macroblocks[offset].mv.y == 0))
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            continue;
62

    
63
        vect[nb_pred++] = s->macroblocks[offset].mv;
64
        if (nb_pred > 1) {
65
            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

    
71
    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
{
79
    VP56RangeCoder *c = &s->c;
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    VP56Model *model = s->modelp;
81
    int i, ctx, type;
82

    
83
    for (ctx=0; ctx<3; ctx++) {
84
        if (vp56_rac_get_prob(c, 174)) {
85
            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]));
89
        }
90
        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++) {
93
                    if (vp56_rac_get_prob(c, 205)) {
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                        int delta, sign = vp56_rac_get(c);
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96
                        delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
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                                                  vp56_mb_type_model_model);
98
                        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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                }
103
            }
104
        }
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    }
106

    
107
    /* 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];
113

    
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        for (type=0; type<10; type++) {
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            int p02, p34, p0234, p17, p56, p89, p5689, p156789;
116

    
117
            /* 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

    
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            /* 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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            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];
144
        }
145
    }
146
}
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_deblock_filter(VP56Context *s, uint8_t *yuv,
304
                                int stride, int dx, int dy)
305
{
306
    int t = vp56_filter_threshold[s->quantizer];
307
    if (dx)  s->vp56dsp.edge_filter_hor(yuv +         10-dx , stride, t);
308
    if (dy)  s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);
309
}
310

    
311
static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
312
                    int stride, int x, int y)
313
{
314
    uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];
315
    uint8_t *src_block;
316
    int src_offset;
317
    int overlap_offset = 0;
318
    int mask = s->vp56_coord_div[b] - 1;
319
    int deblock_filtering = s->deblock_filtering;
320
    int dx;
321
    int dy;
322

    
323
    if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
324
        (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
325
         && !s->framep[VP56_FRAME_CURRENT]->key_frame))
326
        deblock_filtering = 0;
327

    
328
    dx = s->mv[b].x / s->vp56_coord_div[b];
329
    dy = s->mv[b].y / s->vp56_coord_div[b];
330

    
331
    if (b >= 4) {
332
        x /= 2;
333
        y /= 2;
334
    }
335
    x += dx - 2;
336
    y += dy - 2;
337

    
338
    if (x<0 || x+12>=s->plane_width[plane] ||
339
        y<0 || y+12>=s->plane_height[plane]) {
340
        s->dsp.emulated_edge_mc(s->edge_emu_buffer,
341
                            src + s->block_offset[b] + (dy-2)*stride + (dx-2),
342
                            stride, 12, 12, x, y,
343
                            s->plane_width[plane],
344
                            s->plane_height[plane]);
345
        src_block = s->edge_emu_buffer;
346
        src_offset = 2 + 2*stride;
347
    } else if (deblock_filtering) {
348
        /* only need a 12x12 block, but there is no such dsp function, */
349
        /* so copy a 16x12 block */
350
        s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
351
                                    src + s->block_offset[b] + (dy-2)*stride + (dx-2),
352
                                    stride, 12);
353
        src_block = s->edge_emu_buffer;
354
        src_offset = 2 + 2*stride;
355
    } else {
356
        src_block = src;
357
        src_offset = s->block_offset[b] + dy*stride + dx;
358
    }
359

    
360
    if (deblock_filtering)
361
        vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
362

    
363
    if (s->mv[b].x & mask)
364
        overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
365
    if (s->mv[b].y & mask)
366
        overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
367

    
368
    if (overlap_offset) {
369
        if (s->filter)
370
            s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
371
                      stride, s->mv[b], mask, s->filter_selection, b<4);
372
        else
373
            s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
374
                                           src_block+src_offset+overlap_offset,
375
                                           stride, 8);
376
    } else {
377
        s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
378
    }
379
}
380

    
381
static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
382
{
383
    AVFrame *frame_current, *frame_ref;
384
    VP56mb mb_type;
385
    VP56Frame ref_frame;
386
    int b, ab, b_max, plane, off;
387

    
388
    if (s->framep[VP56_FRAME_CURRENT]->key_frame)
389
        mb_type = VP56_MB_INTRA;
390
    else
391
        mb_type = vp56_decode_mv(s, row, col);
392
    ref_frame = vp56_reference_frame[mb_type];
393

    
394
    s->dsp.clear_blocks(*s->block_coeff);
395

    
396
    s->parse_coeff(s);
397

    
398
    vp56_add_predictors_dc(s, ref_frame);
399

    
400
    frame_current = s->framep[VP56_FRAME_CURRENT];
401
    frame_ref = s->framep[ref_frame];
402

    
403
    ab = 6*is_alpha;
404
    b_max = 6 - 2*is_alpha;
405

    
406
    switch (mb_type) {
407
        case VP56_MB_INTRA:
408
            for (b=0; b<b_max; b++) {
409
                plane = vp56_b2p[b+ab];
410
                s->dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
411
                                s->stride[plane], s->block_coeff[b]);
412
            }
413
            break;
414

    
415
        case VP56_MB_INTER_NOVEC_PF:
416
        case VP56_MB_INTER_NOVEC_GF:
417
            for (b=0; b<b_max; b++) {
418
                plane = vp56_b2p[b+ab];
419
                off = s->block_offset[b];
420
                s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
421
                                            frame_ref->data[plane] + off,
422
                                            s->stride[plane], 8);
423
                s->dsp.idct_add(frame_current->data[plane] + off,
424
                                s->stride[plane], s->block_coeff[b]);
425
            }
426
            break;
427

    
428
        case VP56_MB_INTER_DELTA_PF:
429
        case VP56_MB_INTER_V1_PF:
430
        case VP56_MB_INTER_V2_PF:
431
        case VP56_MB_INTER_DELTA_GF:
432
        case VP56_MB_INTER_4V:
433
        case VP56_MB_INTER_V1_GF:
434
        case VP56_MB_INTER_V2_GF:
435
            for (b=0; b<b_max; b++) {
436
                int x_off = b==1 || b==3 ? 8 : 0;
437
                int y_off = b==2 || b==3 ? 8 : 0;
438
                plane = vp56_b2p[b+ab];
439
                vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
440
                        16*col+x_off, 16*row+y_off);
441
                s->dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
442
                                s->stride[plane], s->block_coeff[b]);
443
            }
444
            break;
445
    }
446
}
447

    
448
static int vp56_size_changed(AVCodecContext *avctx)
449
{
450
    VP56Context *s = avctx->priv_data;
451
    int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
452
    int i;
453

    
454
    s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;
455
    s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;
456
    s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
457
    s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
458

    
459
    for (i=0; i<4; i++)
460
        s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
461

    
462
    s->mb_width  = (avctx->coded_width +15) / 16;
463
    s->mb_height = (avctx->coded_height+15) / 16;
464

    
465
    if (s->mb_width > 1000 || s->mb_height > 1000) {
466
        av_log(avctx, AV_LOG_ERROR, "picture too big\n");
467
        return -1;
468
    }
469

    
470
    s->qscale_table = av_realloc(s->qscale_table, s->mb_width);
471
    s->above_blocks = av_realloc(s->above_blocks,
472
                                 (4*s->mb_width+6) * sizeof(*s->above_blocks));
473
    s->macroblocks = av_realloc(s->macroblocks,
474
                                s->mb_width*s->mb_height*sizeof(*s->macroblocks));
475
    av_free(s->edge_emu_buffer_alloc);
476
    s->edge_emu_buffer_alloc = av_malloc(16*stride);
477
    s->edge_emu_buffer = s->edge_emu_buffer_alloc;
478
    if (s->flip < 0)
479
        s->edge_emu_buffer += 15 * stride;
480

    
481
    return 0;
482
}
483

    
484
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
485
                         AVPacket *avpkt)
486
{
487
    const uint8_t *buf = avpkt->data;
488
    VP56Context *s = avctx->priv_data;
489
    AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
490
    int remaining_buf_size = avpkt->size;
491
    int is_alpha, av_uninit(alpha_offset);
492

    
493
    if (s->has_alpha) {
494
        if (remaining_buf_size < 3)
495
            return -1;
496
        alpha_offset = bytestream_get_be24(&buf);
497
        remaining_buf_size -= 3;
498
        if (remaining_buf_size < alpha_offset)
499
            return -1;
500
    }
501

    
502
    for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
503
        int mb_row, mb_col, mb_row_flip, mb_offset = 0;
504
        int block, y, uv, stride_y, stride_uv;
505
        int golden_frame = 0;
506
        int res;
507

    
508
        s->modelp = &s->models[is_alpha];
509

    
510
        res = s->parse_header(s, buf, remaining_buf_size, &golden_frame);
511
        if (!res)
512
            return -1;
513

    
514
        if (!is_alpha) {
515
            p->reference = 1;
516
            if (avctx->get_buffer(avctx, p) < 0) {
517
                av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
518
                return -1;
519
            }
520

    
521
            if (res == 2)
522
                if (vp56_size_changed(avctx)) {
523
                    avctx->release_buffer(avctx, p);
524
                    return -1;
525
                }
526
        }
527

    
528
        if (p->key_frame) {
529
            p->pict_type = FF_I_TYPE;
530
            s->default_models_init(s);
531
            for (block=0; block<s->mb_height*s->mb_width; block++)
532
                s->macroblocks[block].type = VP56_MB_INTRA;
533
        } else {
534
            p->pict_type = FF_P_TYPE;
535
            vp56_parse_mb_type_models(s);
536
            s->parse_vector_models(s);
537
            s->mb_type = VP56_MB_INTER_NOVEC_PF;
538
        }
539

    
540
        s->parse_coeff_models(s);
541

    
542
        memset(s->prev_dc, 0, sizeof(s->prev_dc));
543
        s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
544
        s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
545

    
546
        for (block=0; block < 4*s->mb_width+6; block++) {
547
            s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
548
            s->above_blocks[block].dc_coeff = 0;
549
            s->above_blocks[block].not_null_dc = 0;
550
        }
551
        s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
552
        s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
553

    
554
        stride_y  = p->linesize[0];
555
        stride_uv = p->linesize[1];
556

    
557
        if (s->flip < 0)
558
            mb_offset = 7;
559

    
560
        /* main macroblocks loop */
561
        for (mb_row=0; mb_row<s->mb_height; mb_row++) {
562
            if (s->flip < 0)
563
                mb_row_flip = s->mb_height - mb_row - 1;
564
            else
565
                mb_row_flip = mb_row;
566

    
567
            for (block=0; block<4; block++) {
568
                s->left_block[block].ref_frame = VP56_FRAME_NONE;
569
                s->left_block[block].dc_coeff = 0;
570
                s->left_block[block].not_null_dc = 0;
571
            }
572
            memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
573
            memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
574

    
575
            s->above_block_idx[0] = 1;
576
            s->above_block_idx[1] = 2;
577
            s->above_block_idx[2] = 1;
578
            s->above_block_idx[3] = 2;
579
            s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
580
            s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
581

    
582
            s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
583
            s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
584
            s->block_offset[1] = s->block_offset[0] + 8;
585
            s->block_offset[3] = s->block_offset[2] + 8;
586
            s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
587
            s->block_offset[5] = s->block_offset[4];
588

    
589
            for (mb_col=0; mb_col<s->mb_width; mb_col++) {
590
                vp56_decode_mb(s, mb_row, mb_col, is_alpha);
591

    
592
                for (y=0; y<4; y++) {
593
                    s->above_block_idx[y] += 2;
594
                    s->block_offset[y] += 16;
595
                }
596

    
597
                for (uv=4; uv<6; uv++) {
598
                    s->above_block_idx[uv] += 1;
599
                    s->block_offset[uv] += 8;
600
                }
601
            }
602
        }
603

    
604
        if (p->key_frame || golden_frame) {
605
            if (s->framep[VP56_FRAME_GOLDEN]->data[0] &&
606
                s->framep[VP56_FRAME_GOLDEN] != s->framep[VP56_FRAME_GOLDEN2])
607
                avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
608
            s->framep[VP56_FRAME_GOLDEN] = p;
609
        }
610

    
611
        if (s->has_alpha) {
612
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN],
613
                              s->framep[VP56_FRAME_GOLDEN2]);
614
            buf += alpha_offset;
615
            remaining_buf_size -= alpha_offset;
616
        }
617
    }
618

    
619
    if (s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN] ||
620
        s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN2]) {
621
        if (s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN] &&
622
            s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN2])
623
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
624
                              s->framep[VP56_FRAME_UNUSED]);
625
        else
626
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
627
                              s->framep[VP56_FRAME_UNUSED2]);
628
    } else if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
629
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
630
    FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
631
                      s->framep[VP56_FRAME_PREVIOUS]);
632

    
633
    p->qstride = 0;
634
    p->qscale_table = s->qscale_table;
635
    p->qscale_type = FF_QSCALE_TYPE_VP56;
636
    *(AVFrame*)data = *p;
637
    *data_size = sizeof(AVFrame);
638

    
639
    return avpkt->size;
640
}
641

    
642
av_cold void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
643
{
644
    VP56Context *s = avctx->priv_data;
645
    int i;
646

    
647
    s->avctx = avctx;
648
    avctx->pix_fmt = has_alpha ? PIX_FMT_YUVA420P : PIX_FMT_YUV420P;
649

    
650
    if (avctx->idct_algo == FF_IDCT_AUTO)
651
        avctx->idct_algo = FF_IDCT_VP3;
652
    dsputil_init(&s->dsp, avctx);
653
    ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);
654
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
655

    
656
    for (i=0; i<4; i++)
657
        s->framep[i] = &s->frames[i];
658
    s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
659
    s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];
660
    s->edge_emu_buffer_alloc = NULL;
661

    
662
    s->above_blocks = NULL;
663
    s->macroblocks = NULL;
664
    s->quantizer = -1;
665
    s->deblock_filtering = 1;
666

    
667
    s->filter = NULL;
668

    
669
    s->has_alpha = has_alpha;
670
    if (flip) {
671
        s->flip = -1;
672
        s->frbi = 2;
673
        s->srbi = 0;
674
    } else {
675
        s->flip = 1;
676
        s->frbi = 0;
677
        s->srbi = 2;
678
    }
679
}
680

    
681
av_cold int ff_vp56_free(AVCodecContext *avctx)
682
{
683
    VP56Context *s = avctx->priv_data;
684

    
685
    av_freep(&s->qscale_table);
686
    av_freep(&s->above_blocks);
687
    av_freep(&s->macroblocks);
688
    av_freep(&s->edge_emu_buffer_alloc);
689
    if (s->framep[VP56_FRAME_GOLDEN]->data[0])
690
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
691
    if (s->framep[VP56_FRAME_GOLDEN2]->data[0])
692
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN2]);
693
    if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
694
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
695
    return 0;
696
}