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
vp6_parse_header(VP56Context * s,const uint8_t * buf,int buf_size)46 static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
47 {
48 VP56RangeCoder *c = &s->c;
49 int parse_filter_info = 0;
50 int coeff_offset = 0;
51 int vrt_shift = 0;
52 int sub_version;
53 int rows, cols;
54 int res = 0;
55 int ret;
56 int separated_coeff = buf[0] & 1;
57
58 s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
59 ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
60
61 if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
62 sub_version = buf[1] >> 3;
63 if (sub_version > 8)
64 return AVERROR_INVALIDDATA;
65 s->filter_header = buf[1] & 0x06;
66 if (buf[1] & 1) {
67 avpriv_report_missing_feature(s->avctx, "Interlacing");
68 return AVERROR_PATCHWELCOME;
69 }
70 if (separated_coeff || !s->filter_header) {
71 coeff_offset = AV_RB16(buf+2) - 2;
72 buf += 2;
73 buf_size -= 2;
74 }
75
76 rows = buf[2]; /* number of stored macroblock rows */
77 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 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 if (!s->macroblocks || /* first frame */
86 16*cols != s->avctx->coded_width ||
87 16*rows != s->avctx->coded_height) {
88 if (s->avctx->extradata_size == 0 &&
89 FFALIGN(s->avctx->width, 16) == 16 * cols &&
90 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 s->avctx->coded_width = 16 * cols;
95 s->avctx->coded_height = 16 * rows;
96 } else {
97 ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
98 if (ret < 0)
99 return ret;
100
101 if (s->avctx->extradata_size == 1) {
102 s->avctx->width -= s->avctx->extradata[0] >> 4;
103 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
104 }
105 }
106 res = VP56_SIZE_CHANGE;
107 }
108
109 ret = ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
110 if (ret < 0)
111 goto fail;
112 vp56_rac_gets(c, 2);
113
114 parse_filter_info = s->filter_header;
115 if (sub_version < 8)
116 vrt_shift = 5;
117 s->sub_version = sub_version;
118 s->golden_frame = 0;
119 } else {
120 if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
121 return AVERROR_INVALIDDATA;
122
123 if (separated_coeff || !s->filter_header) {
124 coeff_offset = AV_RB16(buf+1) - 2;
125 buf += 2;
126 buf_size -= 2;
127 }
128 ret = ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
129 if (ret < 0)
130 return ret;
131
132 s->golden_frame = vp56_rac_get(c);
133 if (s->filter_header) {
134 s->deblock_filtering = vp56_rac_get(c);
135 if (s->deblock_filtering)
136 vp56_rac_get(c);
137 if (s->sub_version > 7)
138 parse_filter_info = vp56_rac_get(c);
139 }
140 }
141
142 if (parse_filter_info) {
143 if (vp56_rac_get(c)) {
144 s->filter_mode = 2;
145 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
146 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 if (s->sub_version > 7)
153 s->filter_selection = vp56_rac_gets(c, 4);
154 else
155 s->filter_selection = 16;
156 }
157
158 s->use_huffman = vp56_rac_get(c);
159
160 s->parse_coeff = vp6_parse_coeff;
161 if (coeff_offset) {
162 buf += coeff_offset;
163 buf_size -= coeff_offset;
164 if (buf_size < 0) {
165 ret = AVERROR_INVALIDDATA;
166 goto fail;
167 }
168 if (s->use_huffman) {
169 s->parse_coeff = vp6_parse_coeff_huffman;
170 init_get_bits(&s->gb, buf, buf_size<<3);
171 } else {
172 ret = ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
173 if (ret < 0)
174 goto fail;
175 s->ccp = &s->cc;
176 }
177 } else {
178 s->ccp = &s->c;
179 }
180
181 return res;
182 fail:
183 if (res == VP56_SIZE_CHANGE)
184 ff_set_dimensions(s->avctx, 0, 0);
185 return ret;
186 }
187
vp6_coeff_order_table_init(VP56Context * s)188 static void vp6_coeff_order_table_init(VP56Context *s)
189 {
190 int i, pos, idx = 1;
191
192 s->modelp->coeff_index_to_pos[0] = 0;
193 for (i=0; i<16; i++)
194 for (pos=1; pos<64; pos++)
195 if (s->modelp->coeff_reorder[pos] == i)
196 s->modelp->coeff_index_to_pos[idx++] = pos;
197
198 for (idx = 0; idx < 64; idx++) {
199 int max = 0;
200 for (i = 0; i <= idx; i++) {
201 int v = s->modelp->coeff_index_to_pos[i];
202 if (v > max)
203 max = v;
204 }
205 if (s->sub_version > 6)
206 max++;
207 s->modelp->coeff_index_to_idct_selector[idx] = max;
208 }
209 }
210
vp6_default_models_init(VP56Context * s)211 static void vp6_default_models_init(VP56Context *s)
212 {
213 VP56Model *model = s->modelp;
214
215 model->vector_dct[0] = 0xA2;
216 model->vector_dct[1] = 0xA4;
217 model->vector_sig[0] = 0x80;
218 model->vector_sig[1] = 0x80;
219
220 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
221 memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
222 memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
223 memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
224 memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
225
226 vp6_coeff_order_table_init(s);
227 }
228
vp6_parse_vector_models(VP56Context * s)229 static void vp6_parse_vector_models(VP56Context *s)
230 {
231 VP56RangeCoder *c = &s->c;
232 VP56Model *model = s->modelp;
233 int comp, node;
234
235 for (comp=0; comp<2; comp++) {
236 if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][0]))
237 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
238 if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][1]))
239 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
240 }
241
242 for (comp=0; comp<2; comp++)
243 for (node=0; node<7; node++)
244 if (vp56_rac_get_prob_branchy(c, vp6_pdv_pct[comp][node]))
245 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
246
247 for (comp=0; comp<2; comp++)
248 for (node=0; node<8; node++)
249 if (vp56_rac_get_prob_branchy(c, vp6_fdv_pct[comp][node]))
250 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
251 }
252
253 /* nodes must ascend by count, but with descending symbol order */
vp6_huff_cmp(const void * va,const void * vb)254 static int vp6_huff_cmp(const void *va, const void *vb)
255 {
256 const Node *a = va, *b = vb;
257 return (a->count - b->count)*16 + (b->sym - a->sym);
258 }
259
vp6_build_huff_tree(VP56Context * s,uint8_t coeff_model[],const uint8_t * map,unsigned size,VLC * vlc)260 static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
261 const uint8_t *map, unsigned size, VLC *vlc)
262 {
263 Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
264 int a, b, i;
265
266 /* first compute probabilities from model */
267 tmp[0].count = 256;
268 for (i=0; i<size-1; i++) {
269 a = tmp[i].count * coeff_model[i] >> 8;
270 b = tmp[i].count * (255 - coeff_model[i]) >> 8;
271 nodes[map[2*i ]].count = a + !a;
272 nodes[map[2*i+1]].count = b + !b;
273 }
274
275 ff_free_vlc(vlc);
276 /* then build the huffman tree according to probabilities */
277 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
vp6_parse_coeff_models(VP56Context * s)282 static int vp6_parse_coeff_models(VP56Context *s)
283 {
284 VP56RangeCoder *c = &s->c;
285 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 memset(def_prob, 0x80, sizeof(def_prob));
292
293 for (pt=0; pt<2; pt++)
294 for (node=0; node<11; node++)
295 if (vp56_rac_get_prob_branchy(c, vp6_dccv_pct[pt][node])) {
296 def_prob[node] = vp56_rac_gets_nn(c, 7);
297 model->coeff_dccv[pt][node] = def_prob[node];
298 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
299 model->coeff_dccv[pt][node] = def_prob[node];
300 }
301
302 if (vp56_rac_get(c)) {
303 for (pos=1; pos<64; pos++)
304 if (vp56_rac_get_prob_branchy(c, vp6_coeff_reorder_pct[pos]))
305 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
306 vp6_coeff_order_table_init(s);
307 }
308
309 for (cg=0; cg<2; cg++)
310 for (node=0; node<14; node++)
311 if (vp56_rac_get_prob_branchy(c, vp6_runv_pct[cg][node]))
312 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
313
314 for (ct=0; ct<3; ct++)
315 for (pt=0; pt<2; pt++)
316 for (cg=0; cg<6; cg++)
317 for (node=0; node<11; node++)
318 if (vp56_rac_get_prob_branchy(c, vp6_ract_pct[ct][pt][cg][node])) {
319 def_prob[node] = vp56_rac_gets_nn(c, 7);
320 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
321 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
322 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
323 }
324
325 if (s->use_huffman) {
326 for (pt=0; pt<2; pt++) {
327 if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
328 vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
329 return -1;
330 if (vp6_build_huff_tree(s, model->coeff_runv[pt],
331 vp6_huff_run_map, 9, &s->runv_vlc[pt]))
332 return -1;
333 for (ct=0; ct<3; ct++)
334 for (cg = 0; cg < 6; cg++)
335 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 memset(s->nb_null, 0, sizeof(s->nb_null));
341 } else {
342 /* coeff_dcct is a linear combination of coeff_dccv */
343 for (pt=0; pt<2; pt++)
344 for (ctx=0; ctx<3; ctx++)
345 for (node=0; node<5; node++)
346 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 return 0;
349 }
350
vp6_parse_vector_adjustment(VP56Context * s,VP56mv * vect)351 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
352 {
353 VP56RangeCoder *c = &s->c;
354 VP56Model *model = s->modelp;
355 int comp;
356
357 *vect = (VP56mv) {0,0};
358 if (s->vector_candidate_pos < 2)
359 *vect = s->vector_candidate[0];
360
361 for (comp=0; comp<2; comp++) {
362 int i, delta = 0;
363
364 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 for (i=0; i<sizeof(prob_order); i++) {
367 int j = prob_order[i];
368 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
369 }
370 if (delta & 0xF0)
371 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
372 else
373 delta |= 8;
374 } else {
375 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
376 model->vector_pdv[comp]);
377 }
378
379 if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp]))
380 delta = -delta;
381
382 if (!comp)
383 vect->x += delta;
384 else
385 vect->y += delta;
386 }
387 }
388
389 /**
390 * Read number of consecutive blocks with null DC or AC.
391 * This value is < 74.
392 */
vp6_get_nb_null(VP56Context * s)393 static unsigned vp6_get_nb_null(VP56Context *s)
394 {
395 unsigned val = get_bits(&s->gb, 2);
396 if (val == 2)
397 val += get_bits(&s->gb, 2);
398 else if (val == 3) {
399 val = get_bits1(&s->gb) << 2;
400 val = 6+val + get_bits(&s->gb, 2+val);
401 }
402 return val;
403 }
404
vp6_parse_coeff_huffman(VP56Context * s)405 static int vp6_parse_coeff_huffman(VP56Context *s)
406 {
407 VP56Model *model = s->modelp;
408 uint8_t *permute = s->idct_scantable;
409 VLC *vlc_coeff;
410 int coeff, sign, coeff_idx;
411 int b, cg, idx;
412 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
413
414 for (b=0; b<6; b++) {
415 int ct = 0; /* code type */
416 if (b > 3) pt = 1;
417 vlc_coeff = &s->dccv_vlc[pt];
418
419 for (coeff_idx = 0;;) {
420 int run = 1;
421 if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
422 s->nb_null[coeff_idx][pt]--;
423 if (coeff_idx)
424 break;
425 } else {
426 if (get_bits_left(&s->gb) <= 0)
427 return AVERROR_INVALIDDATA;
428 coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3);
429 if (coeff == 0) {
430 if (coeff_idx) {
431 int pt = (coeff_idx >= 6);
432 run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3);
433 if (run >= 9)
434 run += get_bits(&s->gb, 6);
435 } else
436 s->nb_null[0][pt] = vp6_get_nb_null(s);
437 ct = 0;
438 } else if (coeff == 11) { /* end of block */
439 if (coeff_idx == 1) /* first AC coeff ? */
440 s->nb_null[1][pt] = vp6_get_nb_null(s);
441 break;
442 } else {
443 int coeff2 = ff_vp56_coeff_bias[coeff];
444 if (coeff > 4)
445 coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
446 ct = 1 + (coeff2 > 1);
447 sign = get_bits1(&s->gb);
448 coeff2 = (coeff2 ^ -sign) + sign;
449 if (coeff_idx)
450 coeff2 *= s->dequant_ac;
451 idx = model->coeff_index_to_pos[coeff_idx];
452 s->block_coeff[b][permute[idx]] = coeff2;
453 }
454 }
455 coeff_idx+=run;
456 if (coeff_idx >= 64)
457 break;
458 cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
459 vlc_coeff = &s->ract_vlc[pt][ct][cg];
460 }
461 s->idct_selector[b] = model->coeff_index_to_idct_selector[FFMIN(coeff_idx, 63)];
462 }
463 return 0;
464 }
465
vp6_parse_coeff(VP56Context * s)466 static int vp6_parse_coeff(VP56Context *s)
467 {
468 VP56RangeCoder *c = s->ccp;
469 VP56Model *model = s->modelp;
470 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 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
475
476 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 for (b=0; b<6; b++) {
482 int ct = 1; /* code type */
483 int run = 1;
484
485 if (b > 3) pt = 1;
486
487 ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc
488 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
489 model1 = model->coeff_dccv[pt];
490 model2 = model->coeff_dcct[pt][ctx];
491
492 coeff_idx = 0;
493 for (;;) {
494 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) {
495 /* parse a coeff */
496 if (vp56_rac_get_prob_branchy(c, model2[2])) {
497 if (vp56_rac_get_prob_branchy(c, model2[3])) {
498 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
499 coeff = ff_vp56_coeff_bias[idx+5];
500 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
501 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
502 } else {
503 if (vp56_rac_get_prob_branchy(c, model2[4]))
504 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
505 else
506 coeff = 2;
507 }
508 ct = 2;
509 } else {
510 ct = 1;
511 coeff = 1;
512 }
513 sign = vp56_rac_get(c);
514 coeff = (coeff ^ -sign) + sign;
515 if (coeff_idx)
516 coeff *= s->dequant_ac;
517 idx = model->coeff_index_to_pos[coeff_idx];
518 s->block_coeff[b][permute[idx]] = coeff;
519 run = 1;
520 } else {
521 /* parse a run */
522 ct = 0;
523 if (coeff_idx > 0) {
524 if (!vp56_rac_get_prob_branchy(c, model2[1]))
525 break;
526
527 model3 = model->coeff_runv[coeff_idx >= 6];
528 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
529 if (!run)
530 for (run=9, i=0; i<6; i++)
531 run += vp56_rac_get_prob(c, model3[i+8]) << i;
532 }
533 }
534 coeff_idx += run;
535 if (coeff_idx >= 64)
536 break;
537 cg = vp6_coeff_groups[coeff_idx];
538 model1 = model2 = model->coeff_ract[pt][ct][cg];
539 }
540
541 s->left_block[ff_vp56_b6to4[b]].not_null_dc =
542 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
543 s->idct_selector[b] = model->coeff_index_to_idct_selector[FFMIN(coeff_idx, 63)];
544 }
545 return 0;
546 }
547
vp6_block_variance(uint8_t * src,ptrdiff_t stride)548 static int vp6_block_variance(uint8_t *src, ptrdiff_t stride)
549 {
550 int sum = 0, square_sum = 0;
551 int y, x;
552
553 for (y=0; y<8; y+=2) {
554 for (x=0; x<8; x+=2) {
555 sum += src[x];
556 square_sum += src[x]*src[x];
557 }
558 src += 2*stride;
559 }
560 return (16*square_sum - sum*sum) >> 8;
561 }
562
vp6_filter_hv4(uint8_t * dst,uint8_t * src,ptrdiff_t stride,int delta,const int16_t * weights)563 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 for (y=0; y<8; y++) {
569 for (x=0; x<8; x++) {
570 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
571 + src[x ] * weights[1]
572 + src[x+delta ] * weights[2]
573 + src[x+2*delta] * weights[3] + 64) >> 7);
574 }
575 src += stride;
576 dst += stride;
577 }
578 }
579
vp6_filter_diag2(VP56Context * s,uint8_t * dst,uint8_t * src,ptrdiff_t stride,int h_weight,int v_weight)580 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 uint8_t *tmp = s->edge_emu_buffer+16;
584 s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
585 s->h264chroma.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
586 }
587
vp6_filter(VP56Context * s,uint8_t * dst,uint8_t * src,int offset1,int offset2,ptrdiff_t stride,VP56mv mv,int mask,int select,int luma)588 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 int filter4 = 0;
593 int x8 = mv.x & mask;
594 int y8 = mv.y & mask;
595
596 if (luma) {
597 x8 *= 2;
598 y8 *= 2;
599 filter4 = s->filter_mode;
600 if (filter4 == 2) {
601 if (s->max_vector_length &&
602 (FFABS(mv.x) > s->max_vector_length ||
603 FFABS(mv.y) > s->max_vector_length)) {
604 filter4 = 0;
605 } else if (s->sample_variance_threshold
606 && (vp6_block_variance(src+offset1, stride)
607 < s->sample_variance_threshold)) {
608 filter4 = 0;
609 }
610 }
611 }
612
613 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
614 offset1 = offset2;
615 }
616
617 if (filter4) {
618 if (!y8) { /* left or right combine */
619 vp6_filter_hv4(dst, src+offset1, stride, 1,
620 vp6_block_copy_filter[select][x8]);
621 } else if (!x8) { /* above or below combine */
622 vp6_filter_hv4(dst, src+offset1, stride, stride,
623 vp6_block_copy_filter[select][y8]);
624 } else {
625 s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
626 vp6_block_copy_filter[select][x8],
627 vp6_block_copy_filter[select][y8]);
628 }
629 } else {
630 if (!x8 || !y8) {
631 s->h264chroma.put_h264_chroma_pixels_tab[0](dst, src + offset1, stride, 8, x8, y8);
632 } else {
633 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
634 }
635 }
636 }
637
638 static av_cold void vp6_decode_init_context(VP56Context *s);
639
vp6_decode_init(AVCodecContext * avctx)640 static av_cold int vp6_decode_init(AVCodecContext *avctx)
641 {
642 VP56Context *s = avctx->priv_data;
643 int ret;
644
645 if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6,
646 avctx->codec->id == AV_CODEC_ID_VP6A)) < 0)
647 return ret;
648 ff_vp6dsp_init(&s->vp56dsp);
649
650 vp6_decode_init_context(s);
651
652 if (s->has_alpha) {
653 s->alpha_context = av_mallocz(sizeof(VP56Context));
654 ff_vp56_init_context(avctx, s->alpha_context,
655 s->flip == -1, s->has_alpha);
656 ff_vp6dsp_init(&s->alpha_context->vp56dsp);
657 vp6_decode_init_context(s->alpha_context);
658 }
659
660 return 0;
661 }
662
vp6_decode_init_context(VP56Context * s)663 static av_cold void vp6_decode_init_context(VP56Context *s)
664 {
665 s->deblock_filtering = 0;
666 s->vp56_coord_div = vp6_coord_div;
667 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
668 s->filter = vp6_filter;
669 s->default_models_init = vp6_default_models_init;
670 s->parse_vector_models = vp6_parse_vector_models;
671 s->parse_coeff_models = vp6_parse_coeff_models;
672 s->parse_header = vp6_parse_header;
673 }
674
675 static av_cold void vp6_decode_free_context(VP56Context *s);
676
vp6_decode_free(AVCodecContext * avctx)677 static av_cold int vp6_decode_free(AVCodecContext *avctx)
678 {
679 VP56Context *s = avctx->priv_data;
680
681 ff_vp56_free(avctx);
682 vp6_decode_free_context(s);
683
684 if (s->alpha_context) {
685 ff_vp56_free_context(s->alpha_context);
686 vp6_decode_free_context(s->alpha_context);
687 av_freep(&s->alpha_context);
688 }
689
690 return 0;
691 }
692
vp6_decode_free_context(VP56Context * s)693 static av_cold void vp6_decode_free_context(VP56Context *s)
694 {
695 int pt, ct, cg;
696
697 for (pt=0; pt<2; pt++) {
698 ff_free_vlc(&s->dccv_vlc[pt]);
699 ff_free_vlc(&s->runv_vlc[pt]);
700 for (ct=0; ct<3; ct++)
701 for (cg=0; cg<6; cg++)
702 ff_free_vlc(&s->ract_vlc[pt][ct][cg]);
703 }
704 }
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 };
743