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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 St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#include "avcodec.h"
25

    
26
#include "vp56.h"
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#include "vp56data.h"
28

    
29

    
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void vp56_init_dequant(vp56_context_t *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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}
36

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

    
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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 ||
49
            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;
52

    
53
        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 &&
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             s->macroblocks[offset].mv.y == 0))
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            continue;
60

    
61
        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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    }
68

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

    
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    return nb_pred+1;
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}
74

    
75
static void vp56_parse_mb_type_models(vp56_context_t *s)
76
{
77
    vp56_range_coder_t *c = &s->c;
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    int i, ctx, type;
79

    
80
    for (ctx=0; ctx<3; ctx++) {
81
        if (vp56_rac_get_prob(c, 174)) {
82
            int idx = vp56_rac_gets(c, 4);
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            memcpy(s->mb_types_stats[ctx],vp56_pre_def_mb_type_stats[idx][ctx],
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                   sizeof(s->mb_types_stats[ctx]));
85
        }
86
        if (vp56_rac_get_prob(c, 254)) {
87
            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);
91

    
92
                        delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
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                                                  vp56_mb_type_model_model);
94
                        if (!delta)
95
                            delta = 4 * vp56_rac_gets(c, 7);
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                        s->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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        }
101
    }
102

    
103
    /* compute MB type probability tables based on previous MB type */
104
    for (ctx=0; ctx<3; ctx++) {
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        int p[10];
106

    
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        for (type=0; type<10; type++)
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            p[type] = 100 * s->mb_types_stats[ctx][type][1];
109

    
110
        for (type=0; type<10; type++) {
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            int p02, p34, p0234, p17, p56, p89, p5689, p156789;
112

    
113
            /* conservative MB type probability */
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            s->mb_type_model[ctx][type][0] = 255 - (255 * s->mb_types_stats[ctx][type][0]) / (1 + s->mb_types_stats[ctx][type][0] + s->mb_types_stats[ctx][type][1]);
115

    
116
            p[type] = 0;    /* same MB type => weight is null */
117

    
118
            /* 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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128
            s->mb_type_model[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
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            s->mb_type_model[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
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            s->mb_type_model[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
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            s->mb_type_model[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
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            s->mb_type_model[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
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            s->mb_type_model[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
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            s->mb_type_model[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
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            s->mb_type_model[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
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            s->mb_type_model[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
137

    
138
            /* restore initial value */
139
            p[type] = 100 * s->mb_types_stats[ctx][type][1];
140
        }
141
    }
142
}
143

    
144
static vp56_mb_t vp56_parse_mb_type(vp56_context_t *s,
145
                                    vp56_mb_t prev_type, int ctx)
146
{
147
    uint8_t *mb_type_model = s->mb_type_model[ctx][prev_type];
148
    vp56_range_coder_t *c = &s->c;
149

    
150
    if (vp56_rac_get_prob(c, mb_type_model[0]))
151
        return prev_type;
152
    else
153
        return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
154
}
155

    
156
static void vp56_decode_4mv(vp56_context_t *s, int row, int col)
157
{
158
    vp56_mv_t mv = {0,0};
159
    int type[4];
160
    int b;
161

    
162
    /* parse each block type */
163
    for (b=0; b<4; b++) {
164
        type[b] = vp56_rac_gets(&s->c, 2);
165
        if (type[b])
166
            type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */
167
    }
168

    
169
    /* get vectors */
170
    for (b=0; b<4; b++) {
171
        switch (type[b]) {
172
            case VP56_MB_INTER_NOVEC_PF:
173
                s->mv[b] = (vp56_mv_t) {0,0};
174
                break;
175
            case VP56_MB_INTER_DELTA_PF:
176
                s->parse_vector_adjustment(s, &s->mv[b]);
177
                break;
178
            case VP56_MB_INTER_V1_PF:
179
                s->mv[b] = s->vector_candidate[0];
180
                break;
181
            case VP56_MB_INTER_V2_PF:
182
                s->mv[b] = s->vector_candidate[1];
183
                break;
184
        }
185
        mv.x += s->mv[b].x;
186
        mv.y += s->mv[b].y;
187
    }
188

    
189
    /* this is the one selected for the whole MB for prediction */
190
    s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
191

    
192
    /* chroma vectors are average luma vectors */
193
    if (s->avctx->codec->id == CODEC_ID_VP5) {
194
        s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
195
        s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
196
    } else {
197
        s->mv[4] = s->mv[5] = (vp56_mv_t) {mv.x/4, mv.y/4};
198
    }
199
}
200

    
201
static vp56_mb_t vp56_decode_mv(vp56_context_t *s, int row, int col)
202
{
203
    vp56_mv_t *mv, vect = {0,0};
204
    int ctx, b;
205

    
206
    ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
207
    s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
208
    s->macroblocks[row * s->mb_width + col].type = s->mb_type;
209

    
210
    switch (s->mb_type) {
211
        case VP56_MB_INTER_V1_PF:
212
            mv = &s->vector_candidate[0];
213
            break;
214

    
215
        case VP56_MB_INTER_V2_PF:
216
            mv = &s->vector_candidate[1];
217
            break;
218

    
219
        case VP56_MB_INTER_V1_GF:
220
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
221
            mv = &s->vector_candidate[0];
222
            break;
223

    
224
        case VP56_MB_INTER_V2_GF:
225
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
226
            mv = &s->vector_candidate[1];
227
            break;
228

    
229
        case VP56_MB_INTER_DELTA_PF:
230
            s->parse_vector_adjustment(s, &vect);
231
            mv = &vect;
232
            break;
233

    
234
        case VP56_MB_INTER_DELTA_GF:
235
            vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
236
            s->parse_vector_adjustment(s, &vect);
237
            mv = &vect;
238
            break;
239

    
240
        case VP56_MB_INTER_4V:
241
            vp56_decode_4mv(s, row, col);
242
            return s->mb_type;
243

    
244
        default:
245
            mv = &vect;
246
            break;
247
    }
248

    
249
    s->macroblocks[row*s->mb_width + col].mv = *mv;
250

    
251
    /* same vector for all blocks */
252
    for (b=0; b<6; b++)
253
        s->mv[b] = *mv;
254

    
255
    return s->mb_type;
256
}
257

    
258
static void vp56_add_predictors_dc(vp56_context_t *s, vp56_frame_t ref_frame)
259
{
260
    int idx = s->scantable.permutated[0];
261
    int i;
262

    
263
    for (i=0; i<6; i++) {
264
        vp56_ref_dc_t *ab = &s->above_blocks[s->above_block_idx[i]];
265
        vp56_ref_dc_t *lb = &s->left_block[vp56_b6to4[i]];
266
        int count = 0;
267
        int dc = 0;
268

    
269
        if (ref_frame == lb->ref_frame) {
270
            dc += lb->dc_coeff;
271
            count++;
272
        }
273
        if (ref_frame == ab->ref_frame) {
274
            dc += ab->dc_coeff;
275
            count++;
276
        }
277
        if (s->avctx->codec->id == CODEC_ID_VP5) {
278
            if (count < 2 && ref_frame == ab[-1].ref_frame) {
279
                dc += ab[-1].dc_coeff;
280
                count++;
281
            }
282
            if (count < 2 && ref_frame == ab[1].ref_frame) {
283
                dc += ab[1].dc_coeff;
284
                count++;
285
            }
286
        }
287
        if (count == 0)
288
            dc = s->prev_dc[vp56_b6to3[i]][ref_frame];
289
        else if (count == 2)
290
            dc /= 2;
291

    
292
        s->block_coeff[i][idx] += dc;
293
        s->prev_dc[vp56_b6to3[i]][ref_frame] = s->block_coeff[i][idx];
294
        ab->dc_coeff = s->block_coeff[i][idx];
295
        ab->ref_frame = ref_frame;
296
        lb->dc_coeff = s->block_coeff[i][idx];
297
        lb->ref_frame = ref_frame;
298
        s->block_coeff[i][idx] *= s->dequant_dc;
299
    }
300
}
301

    
302
static void vp56_edge_filter(vp56_context_t *s, uint8_t *yuv,
303
                             int pix_inc, int line_inc, int t)
304
{
305
    int pix2_inc = 2 * pix_inc;
306
    int i, v;
307

    
308
    for (i=0; i<12; i++) {
309
        v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4) >>3;
310
        v = s->adjust(v, t);
311
        yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);
312
        yuv[0] = av_clip_uint8(yuv[0] - v);
313
        yuv += line_inc;
314
    }
315
}
316

    
317
static void vp56_deblock_filter(vp56_context_t *s, uint8_t *yuv,
318
                                int stride, int dx, int dy)
319
{
320
    int t = vp56_filter_threshold[s->quantizer];
321
    if (dx)  vp56_edge_filter(s, yuv +         10-dx ,      1, stride, t);
322
    if (dy)  vp56_edge_filter(s, yuv + stride*(10-dy), stride,      1, t);
323
}
324

    
325
static void vp56_mc(vp56_context_t *s, int b, uint8_t *src,
326
                    int stride, int x, int y)
327
{
328
    int plane = vp56_b6to3[b];
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(vp56_context_t *s, int row, int col)
397
{
398
    AVFrame *frame_current, *frame_ref;
399
    vp56_mb_t mb_type;
400
    vp56_frame_t ref_frame;
401
    int b, plan, 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
    memset(s->block_coeff, 0, sizeof(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
    switch (mb_type) {
419
        case VP56_MB_INTRA:
420
            for (b=0; b<6; b++) {
421
                plan = vp56_b6to3[b];
422
                s->dsp.idct_put(frame_current->data[plan] + s->block_offset[b],
423
                                s->stride[plan], s->block_coeff[b]);
424
            }
425
            break;
426

    
427
        case VP56_MB_INTER_NOVEC_PF:
428
        case VP56_MB_INTER_NOVEC_GF:
429
            for (b=0; b<6; b++) {
430
                plan = vp56_b6to3[b];
431
                off = s->block_offset[b];
432
                s->dsp.put_pixels_tab[1][0](frame_current->data[plan] + off,
433
                                            frame_ref->data[plan] + off,
434
                                            s->stride[plan], 8);
435
                s->dsp.idct_add(frame_current->data[plan] + off,
436
                                s->stride[plan], s->block_coeff[b]);
437
            }
438
            break;
439

    
440
        case VP56_MB_INTER_DELTA_PF:
441
        case VP56_MB_INTER_V1_PF:
442
        case VP56_MB_INTER_V2_PF:
443
        case VP56_MB_INTER_DELTA_GF:
444
        case VP56_MB_INTER_4V:
445
        case VP56_MB_INTER_V1_GF:
446
        case VP56_MB_INTER_V2_GF:
447
            for (b=0; b<6; b++) {
448
                int x_off = b==1 || b==3 ? 8 : 0;
449
                int y_off = b==2 || b==3 ? 8 : 0;
450
                plan = vp56_b6to3[b];
451
                vp56_mc(s, b, frame_ref->data[plan], s->stride[plan],
452
                        16*col+x_off, 16*row+y_off);
453
                s->dsp.idct_add(frame_current->data[plan] + s->block_offset[b],
454
                                s->stride[plan], s->block_coeff[b]);
455
            }
456
            break;
457
    }
458
}
459

    
460
static int vp56_size_changed(AVCodecContext *avctx, vp56_context_t *s)
461
{
462
    int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
463
    int i;
464

    
465
    s->plane_width[0] = s->avctx->coded_width;
466
    s->plane_width[1] = s->plane_width[2] = s->avctx->coded_width/2;
467
    s->plane_height[0] = s->avctx->coded_height;
468
    s->plane_height[1] = s->plane_height[2] = s->avctx->coded_height/2;
469

    
470
    for (i=0; i<3; i++)
471
        s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
472

    
473
    s->mb_width = (s->avctx->coded_width+15) / 16;
474
    s->mb_height = (s->avctx->coded_height+15) / 16;
475

    
476
    if (s->mb_width > 1000 || s->mb_height > 1000) {
477
        av_log(avctx, AV_LOG_ERROR, "picture too big\n");
478
        return -1;
479
    }
480

    
481
    s->above_blocks = av_realloc(s->above_blocks,
482
                                 (4*s->mb_width+6) * sizeof(*s->above_blocks));
483
    s->macroblocks = av_realloc(s->macroblocks,
484
                                s->mb_width*s->mb_height*sizeof(*s->macroblocks));
485
    av_free(s->edge_emu_buffer_alloc);
486
    s->edge_emu_buffer_alloc = av_malloc(16*stride);
487
    s->edge_emu_buffer = s->edge_emu_buffer_alloc;
488
    if (s->flip < 0)
489
        s->edge_emu_buffer += 15 * stride;
490

    
491
    return 0;
492
}
493

    
494
int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
495
                      uint8_t *buf, int buf_size)
496
{
497
    vp56_context_t *s = avctx->priv_data;
498
    AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
499
    AVFrame *picture = data;
500
    int mb_row, mb_col, mb_row_flip, mb_offset = 0;
501
    int block, y, uv, stride_y, stride_uv;
502
    int golden_frame = 0;
503
    int res;
504

    
505
    res = s->parse_header(s, buf, buf_size, &golden_frame);
506
    if (!res)
507
        return -1;
508

    
509
    p->reference = 1;
510
    if (avctx->get_buffer(avctx, p) < 0) {
511
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
512
        return -1;
513
    }
514

    
515
    if (res == 2)
516
        if (vp56_size_changed(avctx, s)) {
517
            avctx->release_buffer(avctx, p);
518
            return -1;
519
        }
520

    
521
    if (p->key_frame) {
522
        p->pict_type = FF_I_TYPE;
523
        s->default_models_init(s);
524
        for (block=0; block<s->mb_height*s->mb_width; block++)
525
            s->macroblocks[block].type = VP56_MB_INTRA;
526
    } else {
527
        p->pict_type = FF_P_TYPE;
528
        vp56_parse_mb_type_models(s);
529
        s->parse_vector_models(s);
530
        s->mb_type = VP56_MB_INTER_NOVEC_PF;
531
    }
532

    
533
    s->parse_coeff_models(s);
534

    
535
    memset(s->prev_dc, 0, sizeof(s->prev_dc));
536
    s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
537
    s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
538

    
539
    for (block=0; block < 4*s->mb_width+6; block++) {
540
        s->above_blocks[block].ref_frame = -1;
541
        s->above_blocks[block].dc_coeff = 0;
542
        s->above_blocks[block].not_null_dc = 0;
543
    }
544
    s->above_blocks[2*s->mb_width + 2].ref_frame = 0;
545
    s->above_blocks[3*s->mb_width + 4].ref_frame = 0;
546

    
547
    stride_y  = p->linesize[0];
548
    stride_uv = p->linesize[1];
549

    
550
    if (s->flip < 0)
551
        mb_offset = 7;
552

    
553
    /* main macroblocks loop */
554
    for (mb_row=0; mb_row<s->mb_height; mb_row++) {
555
        if (s->flip < 0)
556
            mb_row_flip = s->mb_height - mb_row - 1;
557
        else
558
            mb_row_flip = mb_row;
559

    
560
        for (block=0; block<4; block++) {
561
            s->left_block[block].ref_frame = -1;
562
            s->left_block[block].dc_coeff = 0;
563
            s->left_block[block].not_null_dc = 0;
564
            memset(s->coeff_ctx[block], 0, 64*sizeof(s->coeff_ctx[block][0]));
565
        }
566
        memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
567

    
568
        s->above_block_idx[0] = 1;
569
        s->above_block_idx[1] = 2;
570
        s->above_block_idx[2] = 1;
571
        s->above_block_idx[3] = 2;
572
        s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
573
        s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
574

    
575
        s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
576
        s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
577
        s->block_offset[1] = s->block_offset[0] + 8;
578
        s->block_offset[3] = s->block_offset[2] + 8;
579
        s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
580
        s->block_offset[5] = s->block_offset[4];
581

    
582
        for (mb_col=0; mb_col<s->mb_width; mb_col++) {
583
            vp56_decode_mb(s, mb_row, mb_col);
584

    
585
            for (y=0; y<4; y++) {
586
                s->above_block_idx[y] += 2;
587
                s->block_offset[y] += 16;
588
            }
589

    
590
            for (uv=4; uv<6; uv++) {
591
                s->above_block_idx[uv] += 1;
592
                s->block_offset[uv] += 8;
593
            }
594
        }
595
    }
596

    
597
    if (s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN])
598
        FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
599
                          s->framep[VP56_FRAME_UNUSED]);
600
    else if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
601
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
602
    if (p->key_frame || golden_frame) {
603
        if (s->framep[VP56_FRAME_GOLDEN]->data[0])
604
            avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
605
        s->framep[VP56_FRAME_GOLDEN] = p;
606
    }
607
    FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
608
                      s->framep[VP56_FRAME_PREVIOUS]);
609

    
610
    *picture = *p;
611
    *data_size = sizeof(AVPicture);
612

    
613
    return buf_size;
614
}
615

    
616
void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip)
617
{
618
    int i;
619

    
620
    s->avctx = avctx;
621
    avctx->pix_fmt = PIX_FMT_YUV420P;
622

    
623
    if (s->avctx->idct_algo == FF_IDCT_AUTO)
624
        s->avctx->idct_algo = FF_IDCT_VP3;
625
    dsputil_init(&s->dsp, s->avctx);
626
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
627

    
628
    avcodec_set_dimensions(s->avctx, 0, 0);
629

    
630
    for (i=0; i<3; i++)
631
        s->framep[i] = &s->frames[i];
632
    s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
633
    s->edge_emu_buffer_alloc = NULL;
634

    
635
    s->above_blocks = NULL;
636
    s->macroblocks = NULL;
637
    s->quantizer = -1;
638
    s->deblock_filtering = 1;
639

    
640
    s->filter = NULL;
641

    
642
    if (flip) {
643
        s->flip = -1;
644
        s->frbi = 2;
645
        s->srbi = 0;
646
    } else {
647
        s->flip = 1;
648
        s->frbi = 0;
649
        s->srbi = 2;
650
    }
651
}
652

    
653
int vp56_free(AVCodecContext *avctx)
654
{
655
    vp56_context_t *s = avctx->priv_data;
656

    
657
    av_free(s->above_blocks);
658
    av_free(s->macroblocks);
659
    av_free(s->edge_emu_buffer_alloc);
660
    if (s->framep[VP56_FRAME_GOLDEN]->data[0]
661
        && (s->framep[VP56_FRAME_PREVIOUS] != s->framep[VP56_FRAME_GOLDEN]))
662
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
663
    if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
664
        avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
665
    return 0;
666
}