GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vp6.c Lines: 405 432 93.8 %
Date: 2020-10-23 17:01:47 Branches: 259 292 88.7 %

Line Branch Exec Source
1
/*
2
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21
/**
22
 * @file
23
 * VP6 compatible video decoder
24
 *
25
 * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
26
 *  - upper 4 bits: difference between encoded width and visible width
27
 *  - lower 4 bits: difference between encoded height and visible height
28
 */
29
30
#include <stdlib.h>
31
32
#include "avcodec.h"
33
#include "get_bits.h"
34
#include "huffman.h"
35
#include "internal.h"
36
37
#include "vp56.h"
38
#include "vp56data.h"
39
#include "vp6data.h"
40
41
#define VP6_MAX_HUFF_SIZE 12
42
43
static int vp6_parse_coeff(VP56Context *s);
44
static int vp6_parse_coeff_huffman(VP56Context *s);
45
46
713
static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
47
{
48
713
    VP56RangeCoder *c = &s->c;
49
713
    int parse_filter_info = 0;
50
713
    int coeff_offset = 0;
51
713
    int vrt_shift = 0;
52
    int sub_version;
53
    int rows, cols;
54
713
    int res = 0;
55
    int ret;
56
713
    int separated_coeff = buf[0] & 1;
57
58
713
    s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
59
713
    ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
60
61
713
    if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
62
39
        sub_version = buf[1] >> 3;
63
39
        if (sub_version > 8)
64
            return AVERROR_INVALIDDATA;
65
39
        s->filter_header = buf[1] & 0x06;
66
39
        if (buf[1] & 1) {
67
            avpriv_report_missing_feature(s->avctx, "Interlacing");
68
            return AVERROR_PATCHWELCOME;
69
        }
70

39
        if (separated_coeff || !s->filter_header) {
71
11
            coeff_offset = AV_RB16(buf+2) - 2;
72
11
            buf += 2;
73
11
            buf_size -= 2;
74
        }
75
76
39
        rows = buf[2];  /* number of stored macroblock rows */
77
39
        cols = buf[3];  /* number of stored macroblock cols */
78
        /* buf[4] is number of displayed macroblock rows */
79
        /* buf[5] is number of displayed macroblock cols */
80

39
        if (!rows || !cols) {
81
            av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
82
            return AVERROR_INVALIDDATA;
83
        }
84
85
39
        if (!s->macroblocks || /* first frame */
86
28
            16*cols != s->avctx->coded_width ||
87
28
            16*rows != s->avctx->coded_height) {
88
11
            if (s->avctx->extradata_size == 0 &&
89
9
                FFALIGN(s->avctx->width,  16) == 16 * cols &&
90
4
                FFALIGN(s->avctx->height, 16) == 16 * rows) {
91
                // We assume this is properly signalled container cropping,
92
                // in an F4V file. Just set the coded_width/height, don't
93
                // touch the cropped ones.
94
4
                s->avctx->coded_width  = 16 * cols;
95
4
                s->avctx->coded_height = 16 * rows;
96
            } else {
97
7
                ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
98
7
                if (ret < 0)
99
                    return ret;
100
101
7
                if (s->avctx->extradata_size == 1) {
102
2
                    s->avctx->width  -= s->avctx->extradata[0] >> 4;
103
2
                    s->avctx->height -= s->avctx->extradata[0] & 0x0F;
104
                }
105
            }
106
11
            res = VP56_SIZE_CHANGE;
107
        }
108
109
39
        ret = ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
110
39
        if (ret < 0)
111
            goto fail;
112
39
        vp56_rac_gets(c, 2);
113
114
39
        parse_filter_info = s->filter_header;
115
39
        if (sub_version < 8)
116
14
            vrt_shift = 5;
117
39
        s->sub_version = sub_version;
118
39
        s->golden_frame = 0;
119
    } else {
120

674
        if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
121
            return AVERROR_INVALIDDATA;
122
123

674
        if (separated_coeff || !s->filter_header) {
124
126
            coeff_offset = AV_RB16(buf+1) - 2;
125
126
            buf += 2;
126
126
            buf_size -= 2;
127
        }
128
674
        ret = ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
129
674
        if (ret < 0)
130
            return ret;
131
132
674
        s->golden_frame = vp56_rac_get(c);
133
674
        if (s->filter_header) {
134
548
            s->deblock_filtering = vp56_rac_get(c);
135
548
            if (s->deblock_filtering)
136
548
                vp56_rac_get(c);
137
548
            if (s->sub_version > 7)
138
429
                parse_filter_info = vp56_rac_get(c);
139
        }
140
    }
141
142
713
    if (parse_filter_info) {
143
167
        if (vp56_rac_get(c)) {
144
167
            s->filter_mode = 2;
145
167
            s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
146
167
            s->max_vector_length = 2 << vp56_rac_gets(c, 3);
147
        } else if (vp56_rac_get(c)) {
148
            s->filter_mode = 1;
149
        } else {
150
            s->filter_mode = 0;
151
        }
152
167
        if (s->sub_version > 7)
153
164
            s->filter_selection = vp56_rac_gets(c, 4);
154
        else
155
3
            s->filter_selection = 16;
156
    }
157
158
713
    s->use_huffman = vp56_rac_get(c);
159
160
713
    s->parse_coeff = vp6_parse_coeff;
161
713
    if (coeff_offset) {
162
137
        buf      += coeff_offset;
163
137
        buf_size -= coeff_offset;
164
137
        if (buf_size < 0) {
165
            ret = AVERROR_INVALIDDATA;
166
            goto fail;
167
        }
168
137
        if (s->use_huffman) {
169
117
            s->parse_coeff = vp6_parse_coeff_huffman;
170
117
            init_get_bits(&s->gb, buf, buf_size<<3);
171
        } else {
172
20
            ret = ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
173
20
            if (ret < 0)
174
                goto fail;
175
20
            s->ccp = &s->cc;
176
        }
177
    } else {
178
576
        s->ccp = &s->c;
179
    }
180
181
713
    return res;
182
fail:
183
    if (res == VP56_SIZE_CHANGE)
184
        ff_set_dimensions(s->avctx, 0, 0);
185
    return ret;
186
}
187
188
40
static void vp6_coeff_order_table_init(VP56Context *s)
189
{
190
40
    int i, pos, idx = 1;
191
192
40
    s->modelp->coeff_index_to_pos[0] = 0;
193
680
    for (i=0; i<16; i++)
194
40960
        for (pos=1; pos<64; pos++)
195
40320
            if (s->modelp->coeff_reorder[pos] == i)
196
2520
                s->modelp->coeff_index_to_pos[idx++] = pos;
197
198
2600
    for (idx = 0; idx < 64; idx++) {
199
2560
        int max = 0;
200
85760
        for (i = 0; i <= idx; i++) {
201
83200
            int v = s->modelp->coeff_index_to_pos[i];
202
83200
            if (v > max)
203
80640
                max = v;
204
        }
205
2560
        if (s->sub_version > 6)
206
2560
            max++;
207
2560
        s->modelp->coeff_index_to_idct_selector[idx] = max;
208
    }
209
40
}
210
211
39
static void vp6_default_models_init(VP56Context *s)
212
{
213
39
    VP56Model *model = s->modelp;
214
215
39
    model->vector_dct[0] = 0xA2;
216
39
    model->vector_dct[1] = 0xA4;
217
39
    model->vector_sig[0] = 0x80;
218
39
    model->vector_sig[1] = 0x80;
219
220
39
    memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
221
39
    memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
222
39
    memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
223
39
    memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
224
39
    memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
225
226
39
    vp6_coeff_order_table_init(s);
227
39
}
228
229
674
static void vp6_parse_vector_models(VP56Context *s)
230
{
231
674
    VP56RangeCoder *c = &s->c;
232
674
    VP56Model *model = s->modelp;
233
    int comp, node;
234
235
2022
    for (comp=0; comp<2; comp++) {
236
1348
        if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][0]))
237
109
            model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
238
1348
        if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][1]))
239
17
            model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
240
    }
241
242
2022
    for (comp=0; comp<2; comp++)
243
10784
        for (node=0; node<7; node++)
244
9436
            if (vp56_rac_get_prob_branchy(c, vp6_pdv_pct[comp][node]))
245
24
                model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
246
247
2022
    for (comp=0; comp<2; comp++)
248
12132
        for (node=0; node<8; node++)
249
10784
            if (vp56_rac_get_prob_branchy(c, vp6_fdv_pct[comp][node]))
250
10
                model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
251
674
}
252
253
/* nodes must ascend by count, but with descending symbol order */
254
149929
static int vp6_huff_cmp(const void *va, const void *vb)
255
{
256
149929
    const Node *a = va, *b = vb;
257
149929
    return (a->count - b->count)*16 + (b->sym - a->sym);
258
}
259
260
4680
static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
261
                               const uint8_t *map, unsigned size, VLC *vlc)
262
{
263
4680
    Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
264
    int a, b, i;
265
266
    /* first compute probabilities from model */
267
4680
    tmp[0].count = 256;
268
55458
    for (i=0; i<size-1; i++) {
269
50778
        a = tmp[i].count *        coeff_model[i]  >> 8;
270
50778
        b = tmp[i].count * (255 - coeff_model[i]) >> 8;
271
50778
        nodes[map[2*i  ]].count = a + !a;
272
50778
        nodes[map[2*i+1]].count = b + !b;
273
    }
274
275
4680
    ff_free_vlc(vlc);
276
    /* then build the huffman tree according to probabilities */
277
4680
    return ff_huff_build_tree(s->avctx, vlc, size, FF_HUFFMAN_BITS,
278
                              nodes, vp6_huff_cmp,
279
                              FF_HUFFMAN_FLAG_HNODE_FIRST);
280
}
281
282
713
static int vp6_parse_coeff_models(VP56Context *s)
283
{
284
713
    VP56RangeCoder *c = &s->c;
285
713
    VP56Model *model = s->modelp;
286
    int def_prob[11];
287
    int node, cg, ctx, pos;
288
    int ct;    /* code type */
289
    int pt;    /* plane type (0 for Y, 1 for U or V) */
290
291
713
    memset(def_prob, 0x80, sizeof(def_prob));
292
293
2139
    for (pt=0; pt<2; pt++)
294
17112
        for (node=0; node<11; node++)
295
15686
            if (vp56_rac_get_prob_branchy(c, vp6_dccv_pct[pt][node])) {
296
1101
                def_prob[node] = vp56_rac_gets_nn(c, 7);
297
1101
                model->coeff_dccv[pt][node] = def_prob[node];
298
14585
            } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
299
562
                model->coeff_dccv[pt][node] = def_prob[node];
300
            }
301
302
713
    if (vp56_rac_get(c)) {
303
64
        for (pos=1; pos<64; pos++)
304
63
            if (vp56_rac_get_prob_branchy(c, vp6_coeff_reorder_pct[pos]))
305
                model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
306
1
        vp6_coeff_order_table_init(s);
307
    }
308
309
2139
    for (cg=0; cg<2; cg++)
310
21390
        for (node=0; node<14; node++)
311
19964
            if (vp56_rac_get_prob_branchy(c, vp6_runv_pct[cg][node]))
312
812
                model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
313
314
2852
    for (ct=0; ct<3; ct++)
315
6417
        for (pt=0; pt<2; pt++)
316
29946
            for (cg=0; cg<6; cg++)
317
308016
                for (node=0; node<11; node++)
318
282348
                    if (vp56_rac_get_prob_branchy(c, vp6_ract_pct[ct][pt][cg][node])) {
319
4801
                        def_prob[node] = vp56_rac_gets_nn(c, 7);
320
4801
                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
321
277547
                    } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
322
13830
                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
323
                    }
324
325
713
    if (s->use_huffman) {
326
351
        for (pt=0; pt<2; pt++) {
327
234
            if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
328
                                    vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
329
                return -1;
330
234
            if (vp6_build_huff_tree(s, model->coeff_runv[pt],
331
                                    vp6_huff_run_map, 9, &s->runv_vlc[pt]))
332
                return -1;
333
936
            for (ct=0; ct<3; ct++)
334
4914
                for (cg = 0; cg < 6; cg++)
335
4212
                    if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
336
                                            vp6_huff_coeff_map, 12,
337
                                            &s->ract_vlc[pt][ct][cg]))
338
                        return -1;
339
        }
340
117
        memset(s->nb_null, 0, sizeof(s->nb_null));
341
    } else {
342
    /* coeff_dcct is a linear combination of coeff_dccv */
343
1788
    for (pt=0; pt<2; pt++)
344
4768
        for (ctx=0; ctx<3; ctx++)
345
21456
            for (node=0; node<5; node++)
346
17880
                model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
347
    }
348
713
    return 0;
349
}
350
351
18340
static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
352
{
353
18340
    VP56RangeCoder *c = &s->c;
354
18340
    VP56Model *model = s->modelp;
355
    int comp;
356
357
18340
    *vect = (VP56mv) {0,0};
358
18340
    if (s->vector_candidate_pos < 2)
359
15667
        *vect = s->vector_candidate[0];
360
361
55020
    for (comp=0; comp<2; comp++) {
362
36680
        int i, delta = 0;
363
364
36680
        if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
365
            static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
366
68968
            for (i=0; i<sizeof(prob_order); i++) {
367
60347
                int j = prob_order[i];
368
60347
                delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
369
            }
370
8621
            if (delta & 0xF0)
371
4328
                delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
372
            else
373
4293
                delta |= 8;
374
        } else {
375
28059
            delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
376
28059
                                      model->vector_pdv[comp]);
377
        }
378
379

36680
        if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp]))
380
13620
            delta = -delta;
381
382
36680
        if (!comp)
383
18340
            vect->x += delta;
384
        else
385
18340
            vect->y += delta;
386
    }
387
18340
}
388
389
/**
390
 * Read number of consecutive blocks with null DC or AC.
391
 * This value is < 74.
392
 */
393
28576
static unsigned vp6_get_nb_null(VP56Context *s)
394
{
395
28576
    unsigned val = get_bits(&s->gb, 2);
396
28576
    if (val == 2)
397
4892
        val += get_bits(&s->gb, 2);
398
23684
    else if (val == 3) {
399
806
        val = get_bits1(&s->gb) << 2;
400
806
        val = 6+val + get_bits(&s->gb, 2+val);
401
    }
402
28576
    return val;
403
}
404
405
16848
static int vp6_parse_coeff_huffman(VP56Context *s)
406
{
407
16848
    VP56Model *model = s->modelp;
408
16848
    uint8_t *permute = s->idct_scantable;
409
    VLC *vlc_coeff;
410
    int coeff, sign, coeff_idx;
411
    int b, cg, idx;
412
16848
    int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
413
414
117936
    for (b=0; b<6; b++) {
415
101088
        int ct = 0;    /* code type */
416
101088
        if (b > 3) pt = 1;
417
101088
        vlc_coeff = &s->dccv_vlc[pt];
418
419
101088
        for (coeff_idx = 0;;) {
420
1161120
            int run = 1;
421

1161120
            if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
422
28871
                s->nb_null[coeff_idx][pt]--;
423
28871
                if (coeff_idx)
424
11362
                    break;
425
            } else {
426
1132249
                if (get_bits_left(&s->gb) <= 0)
427
                    return AVERROR_INVALIDDATA;
428
1132249
                coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3);
429
1132249
                if (coeff == 0) {
430
345601
                    if (coeff_idx) {
431
326823
                        int pt = (coeff_idx >= 6);
432
326823
                        run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3);
433
326823
                        if (run >= 9)
434
60162
                            run += get_bits(&s->gb, 6);
435
                    } else
436
18778
                        s->nb_null[0][pt] = vp6_get_nb_null(s);
437
345601
                    ct = 0;
438
786648
                } else if (coeff == 11) {  /* end of block */
439
88872
                    if (coeff_idx == 1)    /* first AC coeff ? */
440
9798
                        s->nb_null[1][pt] = vp6_get_nb_null(s);
441
88872
                    break;
442
                } else {
443
697776
                    int coeff2 = ff_vp56_coeff_bias[coeff];
444
697776
                    if (coeff > 4)
445
39048
                        coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
446
697776
                    ct = 1 + (coeff2 > 1);
447
697776
                    sign = get_bits1(&s->gb);
448
697776
                    coeff2 = (coeff2 ^ -sign) + sign;
449
697776
                    if (coeff_idx)
450
632975
                        coeff2 *= s->dequant_ac;
451
697776
                    idx = model->coeff_index_to_pos[coeff_idx];
452
697776
                    s->block_coeff[b][permute[idx]] = coeff2;
453
                }
454
            }
455
1060886
            coeff_idx+=run;
456
1060886
            if (coeff_idx >= 64)
457
854
                break;
458
1060032
            cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
459
1060032
            vlc_coeff = &s->ract_vlc[pt][ct][cg];
460
        }
461
101088
        s->idct_selector[b] = model->coeff_index_to_idct_selector[FFMIN(coeff_idx, 63)];
462
    }
463
16848
    return 0;
464
}
465
466
78707
static int vp6_parse_coeff(VP56Context *s)
467
{
468
78707
    VP56RangeCoder *c = s->ccp;
469
78707
    VP56Model *model = s->modelp;
470
78707
    uint8_t *permute = s->idct_scantable;
471
    uint8_t *model1, *model2, *model3;
472
    int coeff, sign, coeff_idx;
473
    int b, i, cg, idx, ctx;
474
78707
    int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
475
476
78707
    if (vpX_rac_is_end(c)) {
477
        av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp6_parse_coeff\n");
478
        return AVERROR_INVALIDDATA;
479
    }
480
481
550949
    for (b=0; b<6; b++) {
482
472242
        int ct = 1;    /* code type */
483
472242
        int run = 1;
484
485
472242
        if (b > 3) pt = 1;
486
487
472242
        ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc
488
472242
              + s->above_blocks[s->above_block_idx[b]].not_null_dc;
489
472242
        model1 = model->coeff_dccv[pt];
490
472242
        model2 = model->coeff_dcct[pt][ctx];
491
492
472242
        coeff_idx = 0;
493
        for (;;) {
494

1838805
            if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) {
495
                /* parse a coeff */
496
671305
                if (vp56_rac_get_prob_branchy(c, model2[2])) {
497
159041
                    if (vp56_rac_get_prob_branchy(c, model2[3])) {
498
33140
                        idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
499
33140
                        coeff = ff_vp56_coeff_bias[idx+5];
500
105809
                        for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
501
72669
                            coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
502
                    } else {
503
125901
                        if (vp56_rac_get_prob_branchy(c, model2[4]))
504
39387
                            coeff = 3 + vp56_rac_get_prob(c, model1[5]);
505
                        else
506
86514
                            coeff = 2;
507
                    }
508
159041
                    ct = 2;
509
                } else {
510
512264
                    ct = 1;
511
512264
                    coeff = 1;
512
                }
513
671305
                sign = vp56_rac_get(c);
514
671305
                coeff = (coeff ^ -sign) + sign;
515
671305
                if (coeff_idx)
516
594035
                    coeff *= s->dequant_ac;
517
671305
                idx = model->coeff_index_to_pos[coeff_idx];
518
671305
                s->block_coeff[b][permute[idx]] = coeff;
519
671305
                run = 1;
520
            } else {
521
                /* parse a run */
522
1167500
                ct = 0;
523
1167500
                if (coeff_idx > 0) {
524
772528
                    if (!vp56_rac_get_prob_branchy(c, model2[1]))
525
471292
                        break;
526
527
301236
                    model3 = model->coeff_runv[coeff_idx >= 6];
528
301236
                    run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
529
301236
                    if (!run)
530
343273
                        for (run=9, i=0; i<6; i++)
531
294234
                            run += vp56_rac_get_prob(c, model3[i+8]) << i;
532
                }
533
            }
534
1367513
            coeff_idx += run;
535
1367513
            if (coeff_idx >= 64)
536
950
                break;
537
1366563
            cg = vp6_coeff_groups[coeff_idx];
538
1366563
            model1 = model2 = model->coeff_ract[pt][ct][cg];
539
        }
540
541
472242
        s->left_block[ff_vp56_b6to4[b]].not_null_dc =
542
472242
        s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
543
472242
        s->idct_selector[b] = model->coeff_index_to_idct_selector[FFMIN(coeff_idx, 63)];
544
    }
545
78707
    return 0;
546
}
547
548
84892
static int vp6_block_variance(uint8_t *src, ptrdiff_t stride)
549
{
550
84892
    int sum = 0, square_sum = 0;
551
    int y, x;
552
553
424460
    for (y=0; y<8; y+=2) {
554
1697840
        for (x=0; x<8; x+=2) {
555
1358272
            sum += src[x];
556
1358272
            square_sum += src[x]*src[x];
557
        }
558
339568
        src += 2*stride;
559
    }
560
84892
    return (16*square_sum - sum*sum) >> 8;
561
}
562
563
32615
static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
564
                           int delta, const int16_t *weights)
565
{
566
    int x, y;
567
568
293535
    for (y=0; y<8; y++) {
569
2348280
        for (x=0; x<8; x++) {
570
2087360
            dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
571
2087360
                                 + src[x        ] * weights[1]
572
2087360
                                 + src[x+delta  ] * weights[2]
573
2087360
                                 + src[x+2*delta] * weights[3] + 64) >> 7);
574
        }
575
260920
        src += stride;
576
260920
        dst += stride;
577
    }
578
32615
}
579
580
52432
static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
581
                             ptrdiff_t stride, int h_weight, int v_weight)
582
{
583
52432
    uint8_t *tmp = s->edge_emu_buffer+16;
584
52432
    s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
585
52432
    s->h264chroma.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
586
52432
}
587
588
171252
static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
589
                       int offset1, int offset2, ptrdiff_t stride,
590
                       VP56mv mv, int mask, int select, int luma)
591
{
592
171252
    int filter4 = 0;
593
171252
    int x8 = mv.x & mask;
594
171252
    int y8 = mv.y & mask;
595
596
171252
    if (luma) {
597
116166
        x8 *= 2;
598
116166
        y8 *= 2;
599
116166
        filter4 = s->filter_mode;
600
116166
        if (filter4 == 2) {
601
105317
            if (s->max_vector_length &&
602
105317
                (FFABS(mv.x) > s->max_vector_length ||
603
92552
                 FFABS(mv.y) > s->max_vector_length)) {
604
20425
                filter4 = 0;
605
84892
            } else if (s->sample_variance_threshold
606
84892
                       && (vp6_block_variance(src+offset1, stride)
607
84892
                           < s->sample_variance_threshold)) {
608
24931
                filter4 = 0;
609
            }
610
        }
611
    }
612
613


171252
    if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
614
89123
        offset1 = offset2;
615
    }
616
617
171252
    if (filter4) {
618
59961
        if (!y8) {                      /* left or right combine */
619
12003
            vp6_filter_hv4(dst, src+offset1, stride, 1,
620
12003
                           vp6_block_copy_filter[select][x8]);
621
47958
        } else if (!x8) {               /* above or below combine */
622
20612
            vp6_filter_hv4(dst, src+offset1, stride, stride,
623
20612
                           vp6_block_copy_filter[select][y8]);
624
        } else {
625
27346
            s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
626
27346
                             vp6_block_copy_filter[select][x8],
627
27346
                             vp6_block_copy_filter[select][y8]);
628
        }
629
    } else {
630

111291
        if (!x8 || !y8) {
631
58859
            s->h264chroma.put_h264_chroma_pixels_tab[0](dst, src + offset1, stride, 8, x8, y8);
632
        } else {
633
52432
            vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
634
        }
635
    }
636
171252
}
637
638
static av_cold void vp6_decode_init_context(VP56Context *s);
639
640
13
static av_cold int vp6_decode_init(AVCodecContext *avctx)
641
{
642
13
    VP56Context *s = avctx->priv_data;
643
    int ret;
644
645
13
    if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6,
646
13
                            avctx->codec->id == AV_CODEC_ID_VP6A)) < 0)
647
        return ret;
648
13
    ff_vp6dsp_init(&s->vp56dsp);
649
650
13
    vp6_decode_init_context(s);
651
652
13
    if (s->has_alpha) {
653
4
        s->alpha_context = av_mallocz(sizeof(VP56Context));
654
4
        ff_vp56_init_context(avctx, s->alpha_context,
655
4
                             s->flip == -1, s->has_alpha);
656
4
        ff_vp6dsp_init(&s->alpha_context->vp56dsp);
657
4
        vp6_decode_init_context(s->alpha_context);
658
    }
659
660
13
    return 0;
661
}
662
663
17
static av_cold void vp6_decode_init_context(VP56Context *s)
664
{
665
17
    s->deblock_filtering = 0;
666
17
    s->vp56_coord_div = vp6_coord_div;
667
17
    s->parse_vector_adjustment = vp6_parse_vector_adjustment;
668
17
    s->filter = vp6_filter;
669
17
    s->default_models_init = vp6_default_models_init;
670
17
    s->parse_vector_models = vp6_parse_vector_models;
671
17
    s->parse_coeff_models = vp6_parse_coeff_models;
672
17
    s->parse_header = vp6_parse_header;
673
17
}
674
675
static av_cold void vp6_decode_free_context(VP56Context *s);
676
677
13
static av_cold int vp6_decode_free(AVCodecContext *avctx)
678
{
679
13
    VP56Context *s = avctx->priv_data;
680
681
13
    ff_vp56_free(avctx);
682
13
    vp6_decode_free_context(s);
683
684
13
    if (s->alpha_context) {
685
4
        ff_vp56_free_context(s->alpha_context);
686
4
        vp6_decode_free_context(s->alpha_context);
687
4
        av_freep(&s->alpha_context);
688
    }
689
690
13
    return 0;
691
}
692
693
17
static av_cold void vp6_decode_free_context(VP56Context *s)
694
{
695
    int pt, ct, cg;
696
697
51
    for (pt=0; pt<2; pt++) {
698
34
        ff_free_vlc(&s->dccv_vlc[pt]);
699
34
        ff_free_vlc(&s->runv_vlc[pt]);
700
136
        for (ct=0; ct<3; ct++)
701
714
            for (cg=0; cg<6; cg++)
702
612
                ff_free_vlc(&s->ract_vlc[pt][ct][cg]);
703
    }
704
17
}
705
706
AVCodec ff_vp6_decoder = {
707
    .name           = "vp6",
708
    .long_name      = NULL_IF_CONFIG_SMALL("On2 VP6"),
709
    .type           = AVMEDIA_TYPE_VIDEO,
710
    .id             = AV_CODEC_ID_VP6,
711
    .priv_data_size = sizeof(VP56Context),
712
    .init           = vp6_decode_init,
713
    .close          = vp6_decode_free,
714
    .decode         = ff_vp56_decode_frame,
715
    .capabilities   = AV_CODEC_CAP_DR1,
716
};
717
718
/* flash version, not flipped upside-down */
719
AVCodec ff_vp6f_decoder = {
720
    .name           = "vp6f",
721
    .long_name      = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
722
    .type           = AVMEDIA_TYPE_VIDEO,
723
    .id             = AV_CODEC_ID_VP6F,
724
    .priv_data_size = sizeof(VP56Context),
725
    .init           = vp6_decode_init,
726
    .close          = vp6_decode_free,
727
    .decode         = ff_vp56_decode_frame,
728
    .capabilities   = AV_CODEC_CAP_DR1,
729
};
730
731
/* flash version, not flipped upside-down, with alpha channel */
732
AVCodec ff_vp6a_decoder = {
733
    .name           = "vp6a",
734
    .long_name      = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
735
    .type           = AVMEDIA_TYPE_VIDEO,
736
    .id             = AV_CODEC_ID_VP6A,
737
    .priv_data_size = sizeof(VP56Context),
738
    .init           = vp6_decode_init,
739
    .close          = vp6_decode_free,
740
    .decode         = ff_vp56_decode_frame,
741
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
742
};