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/**
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 * @file vp56.c
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 * VP5 and VP6 compatible video decoder (common features)
4
 *
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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"
29

    
30

    
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void vp56_init_dequant(vp56_context_t *s, int quantizer)
32
{
33
    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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}
37

    
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static int vp56_get_vectors_predictors(vp56_context_t *s, int row, int col,
39
                                       vp56_frame_t ref_frame)
40
{
41
    int nb_pred = 0;
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    vp56_mv_t vect[2] = {{0,0}, {0,0}};
43
    int pos, offset;
44
    vp56_mv_t mvp;
45

    
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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 ||
50
            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;
53

    
54
        if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
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            continue;
56
        if ((s->macroblocks[offset].mv.x == vect[0].x &&
57
             s->macroblocks[offset].mv.y == vect[0].y) ||
58
            (s->macroblocks[offset].mv.x == 0 &&
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             s->macroblocks[offset].mv.y == 0))
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            continue;
61

    
62
        vect[nb_pred++] = s->macroblocks[offset].mv;
63
        if (nb_pred > 1) {
64
            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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    }
69

    
70
    s->vector_candidate[0] = vect[0];
71
    s->vector_candidate[1] = vect[1];
72

    
73
    return nb_pred+1;
74
}
75

    
76
static void vp56_parse_mb_type_models(vp56_context_t *s)
77
{
78
    vp56_range_coder_t *c = &s->c;
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    vp56_model_t *model = s->modelp;
80
    int i, ctx, type;
81

    
82
    for (ctx=0; ctx<3; ctx++) {
83
        if (vp56_rac_get_prob(c, 174)) {
84
            int idx = vp56_rac_gets(c, 4);
85
            memcpy(model->mb_types_stats[ctx],
86
                   vp56_pre_def_mb_type_stats[idx][ctx],
87
                   sizeof(model->mb_types_stats[ctx]));
88
        }
89
        if (vp56_rac_get_prob(c, 254)) {
90
            for (type=0; type<10; type++) {
91
                for(i=0; i<2; i++) {
92
                    if (vp56_rac_get_prob(c, 205)) {
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                        int delta, sign = vp56_rac_get(c);
94

    
95
                        delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
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                                                  vp56_mb_type_model_model);
97
                        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;
100
                    }
101
                }
102
            }
103
        }
104
    }
105

    
106
    /* compute MB type probability tables based on previous MB type */
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    for (ctx=0; ctx<3; ctx++) {
108
        int p[10];
109

    
110
        for (type=0; type<10; type++)
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            p[type] = 100 * model->mb_types_stats[ctx][type][1];
112

    
113
        for (type=0; type<10; type++) {
114
            int p02, p34, p0234, p17, p56, p89, p5689, p156789;
115

    
116
            /* 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]);
118

    
119
            p[type] = 0;    /* same MB type => weight is null */
120

    
121
            /* binary tree parsing probabilities */
122
            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];
127
            p89 = p[8] + p[9];
128
            p5689 = p56 + p89;
129
            p156789 = p17 + p5689;
130

    
131
            model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
132
            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);
139
            model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
140

    
141
            /* restore initial value */
142
            p[type] = 100 * model->mb_types_stats[ctx][type][1];
143
        }
144
    }
145
}
146

    
147
static vp56_mb_t vp56_parse_mb_type(vp56_context_t *s,
148
                                    vp56_mb_t prev_type, int ctx)
149
{
150
    uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
151
    vp56_range_coder_t *c = &s->c;
152

    
153
    if (vp56_rac_get_prob(c, mb_type_model[0]))
154
        return prev_type;
155
    else
156
        return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
157
}
158

    
159
static void vp56_decode_4mv(vp56_context_t *s, int row, int col)
160
{
161
    vp56_mv_t mv = {0,0};
162
    int type[4];
163
    int b;
164

    
165
    /* parse each block type */
166
    for (b=0; b<4; b++) {
167
        type[b] = vp56_rac_gets(&s->c, 2);
168
        if (type[b])
169
            type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */
170
    }
171

    
172
    /* get vectors */
173
    for (b=0; b<4; b++) {
174
        switch (type[b]) {
175
            case VP56_MB_INTER_NOVEC_PF:
176
                s->mv[b] = (vp56_mv_t) {0,0};
177
                break;
178
            case VP56_MB_INTER_DELTA_PF:
179
                s->parse_vector_adjustment(s, &s->mv[b]);
180
                break;
181
            case VP56_MB_INTER_V1_PF:
182
                s->mv[b] = s->vector_candidate[0];
183
                break;
184
            case VP56_MB_INTER_V2_PF:
185
                s->mv[b] = s->vector_candidate[1];
186
                break;
187
        }
188
        mv.x += s->mv[b].x;
189
        mv.y += s->mv[b].y;
190
    }
191

    
192
    /* this is the one selected for the whole MB for prediction */
193
    s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
194

    
195
    /* chroma vectors are average luma vectors */
196
    if (s->avctx->codec->id == CODEC_ID_VP5) {
197
        s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
198
        s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
199
    } else {
200
        s->mv[4] = s->mv[5] = (vp56_mv_t) {mv.x/4, mv.y/4};
201
    }
202
}
203

    
204
static vp56_mb_t vp56_decode_mv(vp56_context_t *s, int row, int col)
205
{
206
    vp56_mv_t *mv, vect = {0,0};
207
    int ctx, b;
208

    
209
    ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
210
    s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
211
    s->macroblocks[row * s->mb_width + col].type = s->mb_type;
212

    
213
    switch (s->mb_type) {
214
        case VP56_MB_INTER_V1_PF:
215
            mv = &s->vector_candidate[0];
216
            break;
217

    
218
        case VP56_MB_INTER_V2_PF:
219
            mv = &s->vector_candidate[1];
220
            break;
221

    
222
        case VP56_MB_INTER_V1_GF:
223
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
224
            mv = &s->vector_candidate[0];
225
            break;
226

    
227
        case VP56_MB_INTER_V2_GF:
228
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
229
            mv = &s->vector_candidate[1];
230
            break;
231

    
232
        case VP56_MB_INTER_DELTA_PF:
233
            s->parse_vector_adjustment(s, &vect);
234
            mv = &vect;
235
            break;
236

    
237
        case VP56_MB_INTER_DELTA_GF:
238
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
239
            s->parse_vector_adjustment(s, &vect);
240
            mv = &vect;
241
            break;
242

    
243
        case VP56_MB_INTER_4V:
244
            vp56_decode_4mv(s, row, col);
245
            return s->mb_type;
246

    
247
        default:
248
            mv = &vect;
249
            break;
250
    }
251

    
252
    s->macroblocks[row*s->mb_width + col].mv = *mv;
253

    
254
    /* same vector for all blocks */
255
    for (b=0; b<6; b++)
256
        s->mv[b] = *mv;
257

    
258
    return s->mb_type;
259
}
260

    
261
static void vp56_add_predictors_dc(vp56_context_t *s, vp56_frame_t ref_frame)
262
{
263
    int idx = s->scantable.permutated[0];
264
    int i;
265

    
266
    for (i=0; i<6; i++) {
267
        vp56_ref_dc_t *ab = &s->above_blocks[s->above_block_idx[i]];
268
        vp56_ref_dc_t *lb = &s->left_block[vp56_b6to4[i]];
269
        int count = 0;
270
        int dc = 0;
271

    
272
        if (ref_frame == lb->ref_frame) {
273
            dc += lb->dc_coeff;
274
            count++;
275
        }
276
        if (ref_frame == ab->ref_frame) {
277
            dc += ab->dc_coeff;
278
            count++;
279
        }
280
        if (s->avctx->codec->id == CODEC_ID_VP5) {
281
            if (count < 2 && ref_frame == ab[-1].ref_frame) {
282
                dc += ab[-1].dc_coeff;
283
                count++;
284
            }
285
            if (count < 2 && ref_frame == ab[1].ref_frame) {
286
                dc += ab[1].dc_coeff;
287
                count++;
288
            }
289
        }
290
        if (count == 0)
291
            dc = s->prev_dc[vp56_b2p[i]][ref_frame];
292
        else if (count == 2)
293
            dc /= 2;
294

    
295
        s->block_coeff[i][idx] += dc;
296
        s->prev_dc[vp56_b2p[i]][ref_frame] = s->block_coeff[i][idx];
297
        ab->dc_coeff = s->block_coeff[i][idx];
298
        ab->ref_frame = ref_frame;
299
        lb->dc_coeff = s->block_coeff[i][idx];
300
        lb->ref_frame = ref_frame;
301
        s->block_coeff[i][idx] *= s->dequant_dc;
302
    }
303
}
304

    
305
static void vp56_edge_filter(vp56_context_t *s, uint8_t *yuv,
306
                             int pix_inc, int line_inc, int t)
307
{
308
    int pix2_inc = 2 * pix_inc;
309
    int i, v;
310

    
311
    for (i=0; i<12; i++) {
312
        v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4) >>3;
313
        v = s->adjust(v, t);
314
        yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);
315
        yuv[0] = av_clip_uint8(yuv[0] - v);
316
        yuv += line_inc;
317
    }
318
}
319

    
320
static void vp56_deblock_filter(vp56_context_t *s, uint8_t *yuv,
321
                                int stride, int dx, int dy)
322
{
323
    int t = vp56_filter_threshold[s->quantizer];
324
    if (dx)  vp56_edge_filter(s, yuv +         10-dx ,      1, stride, t);
325
    if (dy)  vp56_edge_filter(s, yuv + stride*(10-dy), stride,      1, t);
326
}
327

    
328
static void vp56_mc(vp56_context_t *s, int b, int plane, uint8_t *src,
329
                    int stride, int x, int y)
330
{
331
    uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];
332
    uint8_t *src_block;
333
    int src_offset;
334
    int overlap_offset = 0;
335
    int mask = s->vp56_coord_div[b] - 1;
336
    int deblock_filtering = s->deblock_filtering;
337
    int dx;
338
    int dy;
339

    
340
    if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
341
        (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
342
         && !s->framep[VP56_FRAME_CURRENT]->key_frame))
343
        deblock_filtering = 0;
344

    
345
    dx = s->mv[b].x / s->vp56_coord_div[b];
346
    dy = s->mv[b].y / s->vp56_coord_div[b];
347

    
348
    if (b >= 4) {
349
        x /= 2;
350
        y /= 2;
351
    }
352
    x += dx - 2;
353
    y += dy - 2;
354

    
355
    if (x<0 || x+12>=s->plane_width[plane] ||
356
        y<0 || y+12>=s->plane_height[plane]) {
357
        ff_emulated_edge_mc(s->edge_emu_buffer,
358
                            src + s->block_offset[b] + (dy-2)*stride + (dx-2),
359
                            stride, 12, 12, x, y,
360
                            s->plane_width[plane],
361
                            s->plane_height[plane]);
362
        src_block = s->edge_emu_buffer;
363
        src_offset = 2 + 2*stride;
364
    } else if (deblock_filtering) {
365
        /* only need a 12x12 block, but there is no such dsp function, */
366
        /* so copy a 16x12 block */
367
        s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
368
                                    src + s->block_offset[b] + (dy-2)*stride + (dx-2),
369
                                    stride, 12);
370
        src_block = s->edge_emu_buffer;
371
        src_offset = 2 + 2*stride;
372
    } else {
373
        src_block = src;
374
        src_offset = s->block_offset[b] + dy*stride + dx;
375
    }
376

    
377
    if (deblock_filtering)
378
        vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
379

    
380
    if (s->mv[b].x & mask)
381
        overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
382
    if (s->mv[b].y & mask)
383
        overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
384

    
385
    if (overlap_offset) {
386
        if (s->filter)
387
            s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
388
                      stride, s->mv[b], mask, s->filter_selection, b<4);
389
        else
390
            s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
391
                                           src_block+src_offset+overlap_offset,
392
                                           stride, 8);
393
    } else {
394
        s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
395
    }
396
}
397

    
398
static void vp56_decode_mb(vp56_context_t *s, int row, int col, int is_alpha)
399
{
400
    AVFrame *frame_current, *frame_ref;
401
    vp56_mb_t mb_type;
402
    vp56_frame_t ref_frame;
403
    int b, ab, b_max, plane, off;
404

    
405
    if (s->framep[VP56_FRAME_CURRENT]->key_frame)
406
        mb_type = VP56_MB_INTRA;
407
    else
408
        mb_type = vp56_decode_mv(s, row, col);
409
    ref_frame = vp56_reference_frame[mb_type];
410

    
411
    memset(s->block_coeff, 0, sizeof(s->block_coeff));
412

    
413
    s->parse_coeff(s);
414

    
415
    vp56_add_predictors_dc(s, ref_frame);
416

    
417
    frame_current = s->framep[VP56_FRAME_CURRENT];
418
    frame_ref = s->framep[ref_frame];
419

    
420
    ab = 6*is_alpha;
421
    b_max = 6 - 2*is_alpha;
422

    
423
    switch (mb_type) {
424
        case VP56_MB_INTRA:
425
            for (b=0; b<b_max; b++) {
426
                plane = vp56_b2p[b+ab];
427
                s->dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
428
                                s->stride[plane], s->block_coeff[b]);
429
            }
430
            break;
431

    
432
        case VP56_MB_INTER_NOVEC_PF:
433
        case VP56_MB_INTER_NOVEC_GF:
434
            for (b=0; b<b_max; b++) {
435
                plane = vp56_b2p[b+ab];
436
                off = s->block_offset[b];
437
                s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
438
                                            frame_ref->data[plane] + off,
439
                                            s->stride[plane], 8);
440
                s->dsp.idct_add(frame_current->data[plane] + off,
441
                                s->stride[plane], s->block_coeff[b]);
442
            }
443
            break;
444

    
445
        case VP56_MB_INTER_DELTA_PF:
446
        case VP56_MB_INTER_V1_PF:
447
        case VP56_MB_INTER_V2_PF:
448
        case VP56_MB_INTER_DELTA_GF:
449
        case VP56_MB_INTER_4V:
450
        case VP56_MB_INTER_V1_GF:
451
        case VP56_MB_INTER_V2_GF:
452
            for (b=0; b<b_max; b++) {
453
                int x_off = b==1 || b==3 ? 8 : 0;
454
                int y_off = b==2 || b==3 ? 8 : 0;
455
                plane = vp56_b2p[b+ab];
456
                vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
457
                        16*col+x_off, 16*row+y_off);
458
                s->dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
459
                                s->stride[plane], s->block_coeff[b]);
460
            }
461
            break;
462
    }
463
}
464

    
465
static int vp56_size_changed(AVCodecContext *avctx)
466
{
467
    vp56_context_t *s = avctx->priv_data;
468
    int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
469
    int i;
470

    
471
    s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;
472
    s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;
473
    s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
474
    s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
475

    
476
    for (i=0; i<4; i++)
477
        s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
478

    
479
    s->mb_width  = (avctx->coded_width +15) / 16;
480
    s->mb_height = (avctx->coded_height+15) / 16;
481

    
482
    if (s->mb_width > 1000 || s->mb_height > 1000) {
483
        av_log(avctx, AV_LOG_ERROR, "picture too big\n");
484
        return -1;
485
    }
486

    
487
    s->above_blocks = av_realloc(s->above_blocks,
488
                                 (4*s->mb_width+6) * sizeof(*s->above_blocks));
489
    s->macroblocks = av_realloc(s->macroblocks,
490
                                s->mb_width*s->mb_height*sizeof(*s->macroblocks));
491
    av_free(s->edge_emu_buffer_alloc);
492
    s->edge_emu_buffer_alloc = av_malloc(16*stride);
493
    s->edge_emu_buffer = s->edge_emu_buffer_alloc;
494
    if (s->flip < 0)
495
        s->edge_emu_buffer += 15 * stride;
496

    
497
    return 0;
498
}
499

    
500
int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
501
                      uint8_t *buf, int buf_size)
502
{
503
    vp56_context_t *s = avctx->priv_data;
504
    AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
505
    int is_alpha, alpha_offset;
506

    
507
    if (s->has_alpha) {
508
        alpha_offset = bytestream_get_be24(&buf);
509
        buf_size -= 3;
510
    }
511

    
512
    for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
513
        int mb_row, mb_col, mb_row_flip, mb_offset = 0;
514
        int block, y, uv, stride_y, stride_uv;
515
        int golden_frame = 0;
516
        int res;
517

    
518
        s->modelp = &s->models[is_alpha];
519

    
520
        res = s->parse_header(s, buf, buf_size, &golden_frame);
521
        if (!res)
522
            return -1;
523

    
524
        if (!is_alpha) {
525
            p->reference = 1;
526
            if (avctx->get_buffer(avctx, p) < 0) {
527
                av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
528
                return -1;
529
            }
530

    
531
            if (res == 2)
532
                if (vp56_size_changed(avctx)) {
533
                    avctx->release_buffer(avctx, p);
534
                    return -1;
535
                }
536
        }
537

    
538
        if (p->key_frame) {
539
            p->pict_type = FF_I_TYPE;
540
            s->default_models_init(s);
541
            for (block=0; block<s->mb_height*s->mb_width; block++)
542
                s->macroblocks[block].type = VP56_MB_INTRA;
543
        } else {
544
            p->pict_type = FF_P_TYPE;
545
            vp56_parse_mb_type_models(s);
546
            s->parse_vector_models(s);
547
            s->mb_type = VP56_MB_INTER_NOVEC_PF;
548
        }
549

    
550
        s->parse_coeff_models(s);
551

    
552
        memset(s->prev_dc, 0, sizeof(s->prev_dc));
553
        s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
554
        s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
555

    
556
        for (block=0; block < 4*s->mb_width+6; block++) {
557
            s->above_blocks[block].ref_frame = -1;
558
            s->above_blocks[block].dc_coeff = 0;
559
            s->above_blocks[block].not_null_dc = 0;
560
        }
561
        s->above_blocks[2*s->mb_width + 2].ref_frame = 0;
562
        s->above_blocks[3*s->mb_width + 4].ref_frame = 0;
563

    
564
        stride_y  = p->linesize[0];
565
        stride_uv = p->linesize[1];
566

    
567
        if (s->flip < 0)
568
            mb_offset = 7;
569

    
570
        /* main macroblocks loop */
571
        for (mb_row=0; mb_row<s->mb_height; mb_row++) {
572
            if (s->flip < 0)
573
                mb_row_flip = s->mb_height - mb_row - 1;
574
            else
575
                mb_row_flip = mb_row;
576

    
577
            for (block=0; block<4; block++) {
578
                s->left_block[block].ref_frame = -1;
579
                s->left_block[block].dc_coeff = 0;
580
                s->left_block[block].not_null_dc = 0;
581
            }
582
            memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
583
            memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
584

    
585
            s->above_block_idx[0] = 1;
586
            s->above_block_idx[1] = 2;
587
            s->above_block_idx[2] = 1;
588
            s->above_block_idx[3] = 2;
589
            s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
590
            s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
591

    
592
            s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
593
            s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
594
            s->block_offset[1] = s->block_offset[0] + 8;
595
            s->block_offset[3] = s->block_offset[2] + 8;
596
            s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
597
            s->block_offset[5] = s->block_offset[4];
598

    
599
            for (mb_col=0; mb_col<s->mb_width; mb_col++) {
600
                vp56_decode_mb(s, mb_row, mb_col, is_alpha);
601

    
602
                for (y=0; y<4; y++) {
603
                    s->above_block_idx[y] += 2;
604
                    s->block_offset[y] += 16;
605
                }
606

    
607
                for (uv=4; uv<6; uv++) {
608
                    s->above_block_idx[uv] += 1;
609
                    s->block_offset[uv] += 8;
610
                }
611
            }
612
        }
613

    
614
        if (p->key_frame || golden_frame) {
615
            if (s->framep[VP56_FRAME_GOLDEN]->data[0] &&
616
                s->framep[VP56_FRAME_GOLDEN] != s->framep[VP56_FRAME_GOLDEN2])
617
                avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
618
            s->framep[VP56_FRAME_GOLDEN] = p;
619
        }
620

    
621
        if (s->has_alpha) {
622
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN],
623
                              s->framep[VP56_FRAME_GOLDEN2]);
624
            buf += alpha_offset;
625
            buf_size -= alpha_offset;
626
        }
627
    }
628

    
629
    if (s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN] ||
630
        s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN2]) {
631
        if (s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN] &&
632
            s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN2])
633
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
634
                              s->framep[VP56_FRAME_UNUSED]);
635
        else
636
            FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
637
                              s->framep[VP56_FRAME_UNUSED2]);
638
    } else if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
639
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
640
    FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
641
                      s->framep[VP56_FRAME_PREVIOUS]);
642

    
643
    *(AVFrame*)data = *p;
644
    *data_size = sizeof(AVFrame);
645

    
646
    return buf_size;
647
}
648

    
649
void vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
650
{
651
    vp56_context_t *s = avctx->priv_data;
652
    int i;
653

    
654
    s->avctx = avctx;
655
    avctx->pix_fmt = has_alpha ? PIX_FMT_YUVA420P : PIX_FMT_YUV420P;
656

    
657
    if (avctx->idct_algo == FF_IDCT_AUTO)
658
        avctx->idct_algo = FF_IDCT_VP3;
659
    dsputil_init(&s->dsp, avctx);
660
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
661

    
662
    avcodec_set_dimensions(avctx, 0, 0);
663

    
664
    for (i=0; i<4; i++)
665
        s->framep[i] = &s->frames[i];
666
    s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
667
    s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];
668
    s->edge_emu_buffer_alloc = NULL;
669

    
670
    s->above_blocks = NULL;
671
    s->macroblocks = NULL;
672
    s->quantizer = -1;
673
    s->deblock_filtering = 1;
674

    
675
    s->filter = NULL;
676

    
677
    s->has_alpha = has_alpha;
678
    if (flip) {
679
        s->flip = -1;
680
        s->frbi = 2;
681
        s->srbi = 0;
682
    } else {
683
        s->flip = 1;
684
        s->frbi = 0;
685
        s->srbi = 2;
686
    }
687
}
688

    
689
int vp56_free(AVCodecContext *avctx)
690
{
691
    vp56_context_t *s = avctx->priv_data;
692

    
693
    av_free(s->above_blocks);
694
    av_free(s->macroblocks);
695
    av_free(s->edge_emu_buffer_alloc);
696
    if (s->framep[VP56_FRAME_GOLDEN]->data[0])
697
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
698
    if (s->framep[VP56_FRAME_GOLDEN2]->data[0])
699
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN2]);
700
    if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
701
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
702
    return 0;
703
}