add support for VP6 with huffman encoded blocks
[libav.git] / libavcodec / vp6.c
1 /**
2 * @file vp6.c
3 * VP6 compatible video decoder
4 *
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
6 *
7 * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
8 * - upper 4bits: difference between encoded width and visible width
9 * - lower 4bits: difference between encoded height and visible height
10 *
11 * This file is part of FFmpeg.
12 *
13 * FFmpeg is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2.1 of the License, or (at your option) any later version.
17 *
18 * FFmpeg is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
22 *
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with FFmpeg; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 */
27
28 #include <stdlib.h>
29
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "bitstream.h"
33 #include "huffman.h"
34 #include "mpegvideo.h"
35
36 #include "vp56.h"
37 #include "vp56data.h"
38 #include "vp6data.h"
39
40
41 static void vp6_parse_coeff(vp56_context_t *s);
42 static void vp6_parse_coeff_huffman(vp56_context_t *s);
43
44 static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
45 int *golden_frame)
46 {
47 vp56_range_coder_t *c = &s->c;
48 int parse_filter_info = 0;
49 int coeff_offset = 0;
50 int vrt_shift = 0;
51 int sub_version;
52 int rows, cols;
53 int res = 1;
54 int separated_coeff = buf[0] & 1;
55
56 s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
57 vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
58
59 if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
60 sub_version = buf[1] >> 3;
61 if (sub_version > 8)
62 return 0;
63 s->filter_header = buf[1] & 0x06;
64 if (buf[1] & 1) {
65 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
66 return 0;
67 }
68 if (separated_coeff || !s->filter_header) {
69 coeff_offset = AV_RB16(buf+2) - 2;
70 buf += 2;
71 buf_size -= 2;
72 }
73
74 rows = buf[2]; /* number of stored macroblock rows */
75 cols = buf[3]; /* number of stored macroblock cols */
76 /* buf[4] is number of displayed macroblock rows */
77 /* buf[5] is number of displayed macroblock cols */
78
79 if (16*cols != s->avctx->coded_width ||
80 16*rows != s->avctx->coded_height) {
81 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
82 if (s->avctx->extradata_size == 1) {
83 s->avctx->width -= s->avctx->extradata[0] >> 4;
84 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
85 }
86 res = 2;
87 }
88
89 vp56_init_range_decoder(c, buf+6, buf_size-6);
90 vp56_rac_gets(c, 2);
91
92 parse_filter_info = s->filter_header;
93 if (sub_version < 8)
94 vrt_shift = 5;
95 s->sub_version = sub_version;
96 } else {
97 if (!s->sub_version)
98 return 0;
99
100 if (separated_coeff || !s->filter_header) {
101 coeff_offset = AV_RB16(buf+1) - 2;
102 buf += 2;
103 buf_size -= 2;
104 }
105 vp56_init_range_decoder(c, buf+1, buf_size-1);
106
107 *golden_frame = vp56_rac_get(c);
108 if (s->filter_header) {
109 s->deblock_filtering = vp56_rac_get(c);
110 if (s->deblock_filtering)
111 vp56_rac_get(c);
112 if (s->sub_version > 7)
113 parse_filter_info = vp56_rac_get(c);
114 }
115 }
116
117 if (parse_filter_info) {
118 if (vp56_rac_get(c)) {
119 s->filter_mode = 2;
120 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
121 s->max_vector_length = 2 << vp56_rac_gets(c, 3);
122 } else if (vp56_rac_get(c)) {
123 s->filter_mode = 1;
124 } else {
125 s->filter_mode = 0;
126 }
127 if (s->sub_version > 7)
128 s->filter_selection = vp56_rac_gets(c, 4);
129 else
130 s->filter_selection = 16;
131 }
132
133 s->use_huffman = vp56_rac_get(c);
134
135 s->parse_coeff = vp6_parse_coeff;
136 if (coeff_offset) {
137 buf += coeff_offset;
138 buf_size -= coeff_offset;
139 if (s->use_huffman) {
140 s->parse_coeff = vp6_parse_coeff_huffman;
141 init_get_bits(&s->gb, buf, buf_size);
142 } else {
143 vp56_init_range_decoder(&s->cc, buf, buf_size);
144 s->ccp = &s->cc;
145 }
146 } else {
147 s->ccp = &s->c;
148 }
149
150 return res;
151 }
152
153 static void vp6_coeff_order_table_init(vp56_context_t *s)
154 {
155 int i, pos, idx = 1;
156
157 s->modelp->coeff_index_to_pos[0] = 0;
158 for (i=0; i<16; i++)
159 for (pos=1; pos<64; pos++)
160 if (s->modelp->coeff_reorder[pos] == i)
161 s->modelp->coeff_index_to_pos[idx++] = pos;
162 }
163
164 static void vp6_default_models_init(vp56_context_t *s)
165 {
166 vp56_model_t *model = s->modelp;
167
168 model->vector_dct[0] = 0xA2;
169 model->vector_dct[1] = 0xA4;
170 model->vector_sig[0] = 0x80;
171 model->vector_sig[1] = 0x80;
172
173 memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
174 memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
175 memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
176 memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
177 memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
178
179 vp6_coeff_order_table_init(s);
180 }
181
182 static void vp6_parse_vector_models(vp56_context_t *s)
183 {
184 vp56_range_coder_t *c = &s->c;
185 vp56_model_t *model = s->modelp;
186 int comp, node;
187
188 for (comp=0; comp<2; comp++) {
189 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
190 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
191 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
192 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
193 }
194
195 for (comp=0; comp<2; comp++)
196 for (node=0; node<7; node++)
197 if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
198 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
199
200 for (comp=0; comp<2; comp++)
201 for (node=0; node<8; node++)
202 if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
203 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
204 }
205
206 static int vp6_huff_cmp(const void *va, const void *vb)
207 {
208 const Node *a = va, *b = vb;
209 return a->count >= b->count;
210 }
211
212 static void vp6_build_huff_tree(vp56_context_t *s, uint8_t coeff_model[],
213 const uint8_t *map, unsigned size, VLC *vlc)
214 {
215 Node nodes[2*size], *tmp = &nodes[size];
216 int a, b, i;
217
218 /* first compute probabilities from model */
219 tmp[0].count = 256;
220 for (i=0; i<size-1; i++) {
221 a = tmp[i].count * coeff_model[i] >> 8;
222 b = tmp[i].count * (255 - coeff_model[i]) >> 8;
223 nodes[map[2*i ]].count = a + !a;
224 nodes[map[2*i+1]].count = b + !b;
225 }
226
227 /* then build the huffman tree accodring to probabilities */
228 ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp, 1);
229 }
230
231 static void vp6_parse_coeff_models(vp56_context_t *s)
232 {
233 vp56_range_coder_t *c = &s->c;
234 vp56_model_t *model = s->modelp;
235 int def_prob[11];
236 int node, cg, ctx, pos;
237 int ct; /* code type */
238 int pt; /* plane type (0 for Y, 1 for U or V) */
239
240 memset(def_prob, 0x80, sizeof(def_prob));
241
242 for (pt=0; pt<2; pt++)
243 for (node=0; node<11; node++)
244 if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
245 def_prob[node] = vp56_rac_gets_nn(c, 7);
246 model->coeff_dccv[pt][node] = def_prob[node];
247 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
248 model->coeff_dccv[pt][node] = def_prob[node];
249 }
250
251 if (vp56_rac_get(c)) {
252 for (pos=1; pos<64; pos++)
253 if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
254 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
255 vp6_coeff_order_table_init(s);
256 }
257
258 for (cg=0; cg<2; cg++)
259 for (node=0; node<14; node++)
260 if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
261 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
262
263 for (ct=0; ct<3; ct++)
264 for (pt=0; pt<2; pt++)
265 for (cg=0; cg<6; cg++)
266 for (node=0; node<11; node++)
267 if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
268 def_prob[node] = vp56_rac_gets_nn(c, 7);
269 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
270 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
271 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
272 }
273
274 if (s->use_huffman) {
275 for (pt=0; pt<2; pt++) {
276 vp6_build_huff_tree(s, model->coeff_dccv[pt],
277 vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
278 vp6_build_huff_tree(s, model->coeff_runv[pt],
279 vp6_huff_run_map, 9, &s->runv_vlc[pt]);
280 for (ct=0; ct<3; ct++)
281 for (cg = 0; cg < 6; cg++)
282 vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
283 vp6_huff_coeff_map, 12,
284 &s->ract_vlc[pt][ct][cg]);
285 }
286 memset(s->nb_null, 0, sizeof(s->nb_null));
287 } else {
288 /* coeff_dcct is a linear combination of coeff_dccv */
289 for (pt=0; pt<2; pt++)
290 for (ctx=0; ctx<3; ctx++)
291 for (node=0; node<5; node++)
292 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);
293 }
294 }
295
296 static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
297 {
298 vp56_range_coder_t *c = &s->c;
299 vp56_model_t *model = s->modelp;
300 int comp;
301
302 *vect = (vp56_mv_t) {0,0};
303 if (s->vector_candidate_pos < 2)
304 *vect = s->vector_candidate[0];
305
306 for (comp=0; comp<2; comp++) {
307 int i, delta = 0;
308
309 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
310 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
311 for (i=0; i<sizeof(prob_order); i++) {
312 int j = prob_order[i];
313 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
314 }
315 if (delta & 0xF0)
316 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
317 else
318 delta |= 8;
319 } else {
320 delta = vp56_rac_get_tree(c, vp56_pva_tree,
321 model->vector_pdv[comp]);
322 }
323
324 if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
325 delta = -delta;
326
327 if (!comp)
328 vect->x += delta;
329 else
330 vect->y += delta;
331 }
332 }
333
334 /**
335 * Read number of consecutive blocks with null DC or AC.
336 * This value is < 74.
337 */
338 static unsigned vp6_get_nb_null(vp56_context_t *s)
339 {
340 unsigned val = get_bits(&s->gb, 2);
341 if (val == 2)
342 val += get_bits(&s->gb, 2);
343 else if (val == 3) {
344 val = get_bits1(&s->gb) << 2;
345 val = 6+val + get_bits(&s->gb, 2+val);
346 }
347 return val;
348 }
349
350 static void vp6_parse_coeff_huffman(vp56_context_t *s)
351 {
352 vp56_model_t *model = s->modelp;
353 uint8_t *permute = s->scantable.permutated;
354 VLC *vlc_coeff;
355 int coeff, sign, coeff_idx;
356 int b, cg, idx;
357 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
358
359 for (b=0; b<6; b++) {
360 int ct = 0; /* code type */
361 if (b > 3) pt = 1;
362 vlc_coeff = &s->dccv_vlc[pt];
363
364 for (coeff_idx=0; coeff_idx<64; ) {
365 int run = 1;
366 if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
367 s->nb_null[coeff_idx][pt]--;
368 if (coeff_idx)
369 break;
370 } else {
371 coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
372 if (coeff == 0) {
373 if (coeff_idx) {
374 int pt = (coeff_idx >= 6);
375 run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
376 if (run >= 9)
377 run += get_bits(&s->gb, 6);
378 } else
379 s->nb_null[0][pt] = vp6_get_nb_null(s);
380 ct = 0;
381 } else if (coeff == 11) { /* end of block */
382 if (coeff_idx == 1) /* first AC coeff ? */
383 s->nb_null[1][pt] = vp6_get_nb_null(s);
384 break;
385 } else {
386 int coeff2 = vp56_coeff_bias[coeff];
387 if (coeff > 4)
388 coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
389 ct = 1 + (coeff2 > 1);
390 sign = get_bits1(&s->gb);
391 coeff2 = (coeff2 ^ -sign) + sign;
392 if (coeff_idx)
393 coeff2 *= s->dequant_ac;
394 idx = model->coeff_index_to_pos[coeff_idx];
395 s->block_coeff[b][permute[idx]] = coeff2;
396 }
397 }
398 coeff_idx+=run;
399 cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
400 vlc_coeff = &s->ract_vlc[pt][ct][cg];
401 }
402 }
403 }
404
405 static void vp6_parse_coeff(vp56_context_t *s)
406 {
407 vp56_range_coder_t *c = s->ccp;
408 vp56_model_t *model = s->modelp;
409 uint8_t *permute = s->scantable.permutated;
410 uint8_t *model1, *model2, *model3;
411 int coeff, sign, coeff_idx;
412 int b, i, cg, idx, ctx;
413 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
414
415 for (b=0; b<6; b++) {
416 int ct = 1; /* code type */
417 int run = 1;
418
419 if (b > 3) pt = 1;
420
421 ctx = s->left_block[vp56_b6to4[b]].not_null_dc
422 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
423 model1 = model->coeff_dccv[pt];
424 model2 = model->coeff_dcct[pt][ctx];
425
426 for (coeff_idx=0; coeff_idx<64; ) {
427 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
428 /* parse a coeff */
429 if (vp56_rac_get_prob(c, model2[2])) {
430 if (vp56_rac_get_prob(c, model2[3])) {
431 idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
432 coeff = vp56_coeff_bias[idx+5];
433 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
434 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
435 } else {
436 if (vp56_rac_get_prob(c, model2[4]))
437 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
438 else
439 coeff = 2;
440 }
441 ct = 2;
442 } else {
443 ct = 1;
444 coeff = 1;
445 }
446 sign = vp56_rac_get(c);
447 coeff = (coeff ^ -sign) + sign;
448 if (coeff_idx)
449 coeff *= s->dequant_ac;
450 idx = model->coeff_index_to_pos[coeff_idx];
451 s->block_coeff[b][permute[idx]] = coeff;
452 run = 1;
453 } else {
454 /* parse a run */
455 ct = 0;
456 if (coeff_idx > 0) {
457 if (!vp56_rac_get_prob(c, model2[1]))
458 break;
459
460 model3 = model->coeff_runv[coeff_idx >= 6];
461 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
462 if (!run)
463 for (run=9, i=0; i<6; i++)
464 run += vp56_rac_get_prob(c, model3[i+8]) << i;
465 }
466 }
467
468 cg = vp6_coeff_groups[coeff_idx+=run];
469 model1 = model2 = model->coeff_ract[pt][ct][cg];
470 }
471
472 s->left_block[vp56_b6to4[b]].not_null_dc =
473 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
474 }
475 }
476
477 static int vp6_adjust(int v, int t)
478 {
479 int V = v, s = v >> 31;
480 V ^= s;
481 V -= s;
482 if (V-t-1 >= (unsigned)(t-1))
483 return v;
484 V = 2*t - V;
485 V += s;
486 V ^= s;
487 return V;
488 }
489
490 static int vp6_block_variance(uint8_t *src, int stride)
491 {
492 int sum = 0, square_sum = 0;
493 int y, x;
494
495 for (y=0; y<8; y+=2) {
496 for (x=0; x<8; x+=2) {
497 sum += src[x];
498 square_sum += src[x]*src[x];
499 }
500 src += 2*stride;
501 }
502 return (16*square_sum - sum*sum) >> 8;
503 }
504
505 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
506 int delta, const int16_t *weights)
507 {
508 int x, y;
509
510 for (y=0; y<8; y++) {
511 for (x=0; x<8; x++) {
512 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
513 + src[x ] * weights[1]
514 + src[x+delta ] * weights[2]
515 + src[x+2*delta] * weights[3] + 64) >> 7);
516 }
517 src += stride;
518 dst += stride;
519 }
520 }
521
522 static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
523 int stride, int h_weight, int v_weight)
524 {
525 uint8_t *tmp = s->edge_emu_buffer+16;
526 s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
527 s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
528 }
529
530 static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
531 const int16_t *h_weights,const int16_t *v_weights)
532 {
533 int x, y;
534 int tmp[8*11];
535 int *t = tmp;
536
537 src -= stride;
538
539 for (y=0; y<11; y++) {
540 for (x=0; x<8; x++) {
541 t[x] = av_clip_uint8(( src[x-1] * h_weights[0]
542 + src[x ] * h_weights[1]
543 + src[x+1] * h_weights[2]
544 + src[x+2] * h_weights[3] + 64) >> 7);
545 }
546 src += stride;
547 t += 8;
548 }
549
550 t = tmp + 8;
551 for (y=0; y<8; y++) {
552 for (x=0; x<8; x++) {
553 dst[x] = av_clip_uint8(( t[x-8 ] * v_weights[0]
554 + t[x ] * v_weights[1]
555 + t[x+8 ] * v_weights[2]
556 + t[x+16] * v_weights[3] + 64) >> 7);
557 }
558 dst += stride;
559 t += 8;
560 }
561 }
562
563 static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
564 int offset1, int offset2, int stride,
565 vp56_mv_t mv, int mask, int select, int luma)
566 {
567 int filter4 = 0;
568 int x8 = mv.x & mask;
569 int y8 = mv.y & mask;
570
571 if (luma) {
572 x8 *= 2;
573 y8 *= 2;
574 filter4 = s->filter_mode;
575 if (filter4 == 2) {
576 if (s->max_vector_length &&
577 (FFABS(mv.x) > s->max_vector_length ||
578 FFABS(mv.y) > s->max_vector_length)) {
579 filter4 = 0;
580 } else if (s->sample_variance_threshold
581 && (vp6_block_variance(src+offset1, stride)
582 < s->sample_variance_threshold)) {
583 filter4 = 0;
584 }
585 }
586 }
587
588 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
589 offset1 = offset2;
590 }
591
592 if (filter4) {
593 if (!y8) { /* left or right combine */
594 vp6_filter_hv4(dst, src+offset1, stride, 1,
595 vp6_block_copy_filter[select][x8]);
596 } else if (!x8) { /* above or below combine */
597 vp6_filter_hv4(dst, src+offset1, stride, stride,
598 vp6_block_copy_filter[select][y8]);
599 } else {
600 vp6_filter_diag4(dst, src+offset1 + ((mv.x^mv.y)>>31), stride,
601 vp6_block_copy_filter[select][x8],
602 vp6_block_copy_filter[select][y8]);
603 }
604 } else {
605 if (!x8 || !y8) {
606 s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
607 } else {
608 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
609 }
610 }
611 }
612
613 static int vp6_decode_init(AVCodecContext *avctx)
614 {
615 vp56_context_t *s = avctx->priv_data;
616
617 vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
618 avctx->codec->id == CODEC_ID_VP6A);
619 s->vp56_coord_div = vp6_coord_div;
620 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
621 s->adjust = vp6_adjust;
622 s->filter = vp6_filter;
623 s->default_models_init = vp6_default_models_init;
624 s->parse_vector_models = vp6_parse_vector_models;
625 s->parse_coeff_models = vp6_parse_coeff_models;
626 s->parse_header = vp6_parse_header;
627
628 return 0;
629 }
630
631 AVCodec vp6_decoder = {
632 "vp6",
633 CODEC_TYPE_VIDEO,
634 CODEC_ID_VP6,
635 sizeof(vp56_context_t),
636 vp6_decode_init,
637 NULL,
638 vp56_free,
639 vp56_decode_frame,
640 CODEC_CAP_DR1,
641 };
642
643 /* flash version, not flipped upside-down */
644 AVCodec vp6f_decoder = {
645 "vp6f",
646 CODEC_TYPE_VIDEO,
647 CODEC_ID_VP6F,
648 sizeof(vp56_context_t),
649 vp6_decode_init,
650 NULL,
651 vp56_free,
652 vp56_decode_frame,
653 CODEC_CAP_DR1,
654 };
655
656 /* flash version, not flipped upside-down, with alpha channel */
657 AVCodec vp6a_decoder = {
658 "vp6a",
659 CODEC_TYPE_VIDEO,
660 CODEC_ID_VP6A,
661 sizeof(vp56_context_t),
662 vp6_decode_init,
663 NULL,
664 vp56_free,
665 vp56_decode_frame,
666 CODEC_CAP_DR1,
667 };