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[libav.git] / libavcodec / vp56.c
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1/**
2 * @file vp56.c
3 * VP5 and VP6 compatible video decoder (common features)
4 *
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avcodec.h"
23
24#include "vp56.h"
25#include "vp56data.h"
26
27
28void vp56_init_dequant(vp56_context_t *s, int quantizer)
29{
30 s->quantizer = quantizer;
31 s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
32 s->dequant_ac = vp56_ac_dequant[quantizer] << 2;
33}
34
35static int vp56_get_vectors_predictors(vp56_context_t *s, int row, int col,
36 vp56_frame_t ref_frame)
37{
38 int nb_pred = 0;
39 vp56_mv_t vector[2] = {{0,0}, {0,0}};
40 int pos, offset;
41 vp56_mv_t mvp;
42
43 for (pos=0; pos<12; pos++) {
44 mvp.x = col + vp56_candidate_predictor_pos[pos][0];
45 mvp.y = row + vp56_candidate_predictor_pos[pos][1];
46 if (mvp.x < 0 || mvp.x >= s->mb_width ||
47 mvp.y < 0 || mvp.y >= s->mb_height)
48 continue;
49 offset = mvp.x + s->mb_width*mvp.y;
50
51 if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
52 continue;
53 if ((s->macroblocks[offset].mv.x == vector[0].x &&
54 s->macroblocks[offset].mv.y == vector[0].y) ||
55 (s->macroblocks[offset].mv.x == 0 &&
56 s->macroblocks[offset].mv.y == 0))
57 continue;
58
59 vector[nb_pred++] = s->macroblocks[offset].mv;
60 if (nb_pred > 1) {
61 nb_pred = -1;
62 break;
63 }
64 s->vector_candidate_pos = pos;
65 }
66
67 s->vector_candidate[0] = vector[0];
68 s->vector_candidate[1] = vector[1];
69
70 return nb_pred+1;
71}
72
73static void vp56_parse_mb_type_models(vp56_context_t *s)
74{
75 vp56_range_coder_t *c = &s->c;
76 int i, ctx, type;
77
78 for (ctx=0; ctx<3; ctx++) {
79 if (vp56_rac_get_prob(c, 174)) {
80 int idx = vp56_rac_gets(c, 4);
81 memcpy(s->mb_types_stats[ctx],vp56_pre_def_mb_type_stats[idx][ctx],
82 sizeof(s->mb_types_stats[ctx]));
83 }
84 if (vp56_rac_get_prob(c, 254)) {
85 for (type=0; type<10; type++) {
86 for(i=0; i<2; i++) {
87 if (vp56_rac_get_prob(c, 205)) {
88 int delta, sign = vp56_rac_get(c);
89
90 delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
91 vp56_mb_type_model_model);
92 if (!delta)
93 delta = 4 * vp56_rac_gets(c, 7);
94 s->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
95 }
96 }
97 }
98 }
99 }
100
101 /* compute MB type probability tables based on previous MB type */
102 for (ctx=0; ctx<3; ctx++) {
103 int p[10];
104
105 for (type=0; type<10; type++)
106 p[type] = 100 * s->mb_types_stats[ctx][type][1];
107
108 for (type=0; type<10; type++) {
109 int p02, p34, p0234, p17, p56, p89, p5689, p156789;
110
111 /* conservative MB type probability */
112 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]);
113
114 p[type] = 0; /* same MB type => weight is null */
115
116 /* binary tree parsing probabilities */
117 p02 = p[0] + p[2];
118 p34 = p[3] + p[4];
119 p0234 = p02 + p34;
120 p17 = p[1] + p[7];
121 p56 = p[5] + p[6];
122 p89 = p[8] + p[9];
123 p5689 = p56 + p89;
124 p156789 = p17 + p5689;
125
126 s->mb_type_model[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
127 s->mb_type_model[ctx][type][2] = 1 + 255 * p02 / (1+p0234);
128 s->mb_type_model[ctx][type][3] = 1 + 255 * p17 / (1+p156789);
129 s->mb_type_model[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
130 s->mb_type_model[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
131 s->mb_type_model[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
132 s->mb_type_model[ctx][type][7] = 1 + 255 * p56 / (1+p5689);
133 s->mb_type_model[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
134 s->mb_type_model[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
135
136 /* restore initial value */
137 p[type] = 100 * s->mb_types_stats[ctx][type][1];
138 }
139 }
140}
141
142static vp56_mb_t vp56_parse_mb_type(vp56_context_t *s,
143 vp56_mb_t prev_type, int ctx)
144{
145 uint8_t *mb_type_model = s->mb_type_model[ctx][prev_type];
146 vp56_range_coder_t *c = &s->c;
147
148 if (vp56_rac_get_prob(c, mb_type_model[0]))
149 return prev_type;
150 else
151 return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
152}
153
154static void vp56_decode_4mv(vp56_context_t *s, int row, int col)
155{
156 vp56_mv_t mv = {0,0};
157 int type[4];
158 int b;
159
160 /* parse each block type */
161 for (b=0; b<4; b++) {
162 type[b] = vp56_rac_gets(&s->c, 2);
163 if (type[b])
164 type[b]++; /* only returns 0, 2, 3 or 4 (all INTER_PF) */
165 }
166
167 /* get vectors */
168 for (b=0; b<4; b++) {
169 switch (type[b]) {
170 case VP56_MB_INTER_NOVEC_PF:
171 s->mv[b] = (vp56_mv_t) {0,0};
172 break;
173 case VP56_MB_INTER_DELTA_PF:
174 s->parse_vector_adjustment(s, &s->mv[b]);
175 break;
176 case VP56_MB_INTER_V1_PF:
177 s->mv[b] = s->vector_candidate[0];
178 break;
179 case VP56_MB_INTER_V2_PF:
180 s->mv[b] = s->vector_candidate[1];
181 break;
182 }
183 mv.x += s->mv[b].x;
184 mv.y += s->mv[b].y;
185 }
186
187 /* this is the one selected for the whole MB for prediction */
188 s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
189
190 /* chroma vectors are average luma vectors */
191 if (s->avctx->codec->id == CODEC_ID_VP5) {
192 s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
193 s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
194 } else {
195 s->mv[4] = s->mv[5] = (vp56_mv_t) {mv.x/4, mv.y/4};
196 }
197}
198
199static vp56_mb_t vp56_decode_mv(vp56_context_t *s, int row, int col)
200{
201 vp56_mv_t *mv, vector = {0,0};
202 int ctx, b;
203
204 ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
205 s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
206 s->macroblocks[row * s->mb_width + col].type = s->mb_type;
207
208 switch (s->mb_type) {
209 case VP56_MB_INTER_V1_PF:
210 mv = &s->vector_candidate[0];
211 break;
212
213 case VP56_MB_INTER_V2_PF:
214 mv = &s->vector_candidate[1];
215 break;
216
217 case VP56_MB_INTER_V1_GF:
218 vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
219 mv = &s->vector_candidate[0];
220 break;
221
222 case VP56_MB_INTER_V2_GF:
223 vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
224 mv = &s->vector_candidate[1];
225 break;
226
227 case VP56_MB_INTER_DELTA_PF:
228 s->parse_vector_adjustment(s, &vector);
229 mv = &vector;
230 break;
231
232 case VP56_MB_INTER_DELTA_GF:
233 vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
234 s->parse_vector_adjustment(s, &vector);
235 mv = &vector;
236 break;
237
238 case VP56_MB_INTER_4V:
239 vp56_decode_4mv(s, row, col);
240 return s->mb_type;
241
242 default:
243 mv = &vector;
244 break;
245 }
246
247 s->macroblocks[row*s->mb_width + col].mv = *mv;
248
249 /* same vector for all blocks */
250 for (b=0; b<6; b++)
251 s->mv[b] = *mv;
252
253 return s->mb_type;
254}
255
256static void vp56_add_predictors_dc(vp56_context_t *s, vp56_frame_t ref_frame)
257{
258 int idx = s->scantable.permutated[0];
259 int i;
260
261 for (i=0; i<6; i++) {
262 vp56_ref_dc_t *ab = &s->above_blocks[s->above_block_idx[i]];
263 vp56_ref_dc_t *lb = &s->left_block[vp56_b6to4[i]];
264 int count = 0;
265 int dc = 0;
266
267 if (ref_frame == lb->ref_frame) {
268 dc += lb->dc_coeff;
269 count++;
270 }
271 if (ref_frame == ab->ref_frame) {
272 dc += ab->dc_coeff;
273 count++;
274 }
275 if (s->avctx->codec->id == CODEC_ID_VP5) {
276 if (count < 2 && ref_frame == ab[-1].ref_frame) {
277 dc += ab[-1].dc_coeff;
278 count++;
279 }
280 if (count < 2 && ref_frame == ab[1].ref_frame) {
281 dc += ab[1].dc_coeff;
282 count++;
283 }
284 }
285 if (count == 0)
286 dc = s->prev_dc[vp56_b6to3[i]][ref_frame];
287 else if (count == 2)
288 dc /= 2;
289
290 s->block_coeff[i][idx] += dc;
291 s->prev_dc[vp56_b6to3[i]][ref_frame] = s->block_coeff[i][idx];
292 ab->dc_coeff = s->block_coeff[i][idx];
293 ab->ref_frame = ref_frame;
294 lb->dc_coeff = s->block_coeff[i][idx];
295 lb->ref_frame = ref_frame;
296 s->block_coeff[i][idx] *= s->dequant_dc;
297 }
298}
299
300static void vp56_edge_filter(vp56_context_t *s, uint8_t *yuv,
301 int pix_inc, int line_inc, int t)
302{
303 int pix2_inc = 2 * pix_inc;
304 int i, v;
305
306 for (i=0; i<12; i++) {
307 v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4) >>3;
308 v = s->adjust(v, t);
309 yuv[-pix_inc] = clip_uint8(yuv[-pix_inc] + v);
310 yuv[0] = clip_uint8(yuv[0] - v);
311 yuv += line_inc;
312 }
313}
314
315static void vp56_deblock_filter(vp56_context_t *s, uint8_t *yuv,
316 int stride, int dx, int dy)
317{
318 int t = vp56_filter_threshold[s->quantizer];
319 if (dx) vp56_edge_filter(s, yuv + 10-dx , 1, stride, t);
320 if (dy) vp56_edge_filter(s, yuv + stride*(10-dy), stride, 1, t);
321}
322
323static void vp56_mc(vp56_context_t *s, int b, uint8_t *src,
324 int stride, int x, int y)
325{
326 int plane = vp56_b6to3[b];
327 uint8_t *dst= s->frames[VP56_FRAME_CURRENT].data[plane]+s->block_offset[b];
328 uint8_t *src_block;
329 int src_offset;
330 int overlap_offset = 0;
331 int mask = s->vp56_coord_div[b] - 1;
332 int deblock_filtering = s->deblock_filtering;
333 int dx;
334 int dy;
335
336 if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
337 (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
338 && !s->frames[VP56_FRAME_CURRENT].key_frame))
339 deblock_filtering = 0;
340
341 dx = s->mv[b].x / s->vp56_coord_div[b];
342 dy = s->mv[b].y / s->vp56_coord_div[b];
343
344 if (b >= 4) {
345 x /= 2;
346 y /= 2;
347 }
348 x += dx - 2;
349 y += dy - 2;
350
351 if (x<0 || x+12>=s->plane_width[plane] ||
352 y<0 || y+12>=s->plane_height[plane]) {
353 ff_emulated_edge_mc(s->edge_emu_buffer,
354 src + s->block_offset[b] + (dy-2)*stride + (dx-2),
355 stride, 12, 12, x, y,
356 s->plane_width[plane],
357 s->plane_height[plane]);
358 src_block = s->edge_emu_buffer;
359 src_offset = 2 + 2*stride;
360 } else if (deblock_filtering) {
361 /* only need a 12x12 block, but there is no such dsp function, */
362 /* so copy a 16x12 block */
363 s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
364 src + s->block_offset[b] + (dy-2)*stride + (dx-2),
365 stride, 12);
366 src_block = s->edge_emu_buffer;
367 src_offset = 2 + 2*stride;
368 } else {
369 src_block = src;
370 src_offset = s->block_offset[b] + dy*stride + dx;
371 }
372
373 if (deblock_filtering)
374 vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
375
376 if (s->mv[b].x & mask)
377 overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
378 if (s->mv[b].y & mask)
379 overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
380
381 if (overlap_offset) {
382 if (s->filter)
383 s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
384 stride, s->mv[b], mask, s->filter_selection, b<4);
385 else
386 s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
387 src_block+src_offset+overlap_offset,
388 stride, 8);
389 } else {
390 s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
391 }
392}
393
394static void vp56_decode_mb(vp56_context_t *s, int row, int col)
395{
396 AVFrame *frame_current, *frame_ref;
397 vp56_mb_t mb_type;
398 vp56_frame_t ref_frame;
399 int b, plan, off;
400
401 if (s->frames[VP56_FRAME_CURRENT].key_frame)
402 mb_type = VP56_MB_INTRA;
403 else
404 mb_type = vp56_decode_mv(s, row, col);
405 ref_frame = vp56_reference_frame[mb_type];
406
407 memset(s->block_coeff, 0, sizeof(s->block_coeff));
408
409 s->parse_coeff(s);
410
411 vp56_add_predictors_dc(s, ref_frame);
412
413 frame_current = &s->frames[VP56_FRAME_CURRENT];
414 frame_ref = &s->frames[ref_frame];
415
416 switch (mb_type) {
417 case VP56_MB_INTRA:
418 for (b=0; b<6; b++) {
419 plan = vp56_b6to3[b];
420 s->dsp.idct_put(frame_current->data[plan] + s->block_offset[b],
421 s->stride[plan], s->block_coeff[b]);
422 }
423 break;
424
425 case VP56_MB_INTER_NOVEC_PF:
426 case VP56_MB_INTER_NOVEC_GF:
427 for (b=0; b<6; b++) {
428 plan = vp56_b6to3[b];
429 off = s->block_offset[b];
430 s->dsp.put_pixels_tab[1][0](frame_current->data[plan] + off,
431 frame_ref->data[plan] + off,
432 s->stride[plan], 8);
433 s->dsp.idct_add(frame_current->data[plan] + off,
434 s->stride[plan], s->block_coeff[b]);
435 }
436 break;
437
438 case VP56_MB_INTER_DELTA_PF:
439 case VP56_MB_INTER_V1_PF:
440 case VP56_MB_INTER_V2_PF:
441 case VP56_MB_INTER_DELTA_GF:
442 case VP56_MB_INTER_4V:
443 case VP56_MB_INTER_V1_GF:
444 case VP56_MB_INTER_V2_GF:
445 for (b=0; b<6; b++) {
446 int x_off = b==1 || b==3 ? 8 : 0;
447 int y_off = b==2 || b==3 ? 8 : 0;
448 plan = vp56_b6to3[b];
449 vp56_mc(s, b, frame_ref->data[plan], s->stride[plan],
450 16*col+x_off, 16*row+y_off);
451 s->dsp.idct_add(frame_current->data[plan] + s->block_offset[b],
452 s->stride[plan], s->block_coeff[b]);
453 }
454 break;
455 }
456}
457
458static int vp56_size_changed(AVCodecContext *avctx, vp56_context_t *s)
459{
460 int stride = s->frames[VP56_FRAME_CURRENT].linesize[0];
461 int i;
462
463 s->plane_width[0] = s->avctx->width;
464 s->plane_width[1] = s->plane_width[2] = s->avctx->width/2;
465 s->plane_height[0] = s->avctx->height;
466 s->plane_height[1] = s->plane_height[2] = s->avctx->height/2;
467
468 for (i=0; i<3; i++)
469 s->stride[i] = s->flip * s->frames[VP56_FRAME_CURRENT].linesize[i];
470
471 s->mb_width = (s->avctx->width+15) / 16;
472 s->mb_height = (s->avctx->height+15) / 16;
473
474 if (s->mb_width > 1000 || s->mb_height > 1000) {
475 av_log(avctx, AV_LOG_ERROR, "picture too big\n");
476 return -1;
477 }
478
479 s->above_blocks = av_realloc(s->above_blocks,
480 (4*s->mb_width+6) * sizeof(*s->above_blocks));
481 s->macroblocks = av_realloc(s->macroblocks,
482 s->mb_width*s->mb_height*sizeof(*s->macroblocks));
483 s->edge_emu_buffer_alloc = av_realloc(s->edge_emu_buffer_alloc, 16*stride);
484 s->edge_emu_buffer = s->edge_emu_buffer_alloc;
485 if (s->flip < 0)
486 s->edge_emu_buffer += 15 * stride;
487
488 return 0;
489}
490
491int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
492 uint8_t *buf, int buf_size)
493{
494 vp56_context_t *s = avctx->priv_data;
495 AVFrame *const p = &s->frames[VP56_FRAME_CURRENT];
496 AVFrame *picture = data;
497 int mb_row, mb_col, mb_row_flip, mb_offset = 0;
498 int block, y, uv, stride_y, stride_uv;
499 int golden_frame = 0;
500 int res;
501
502 res = s->parse_header(s, buf, buf_size, &golden_frame);
503 if (!res)
504 return -1;
505
506 p->reference = 1;
507 if (avctx->get_buffer(avctx, p) < 0) {
508 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
509 return -1;
510 }
511
512 if (res == 2)
513 if (vp56_size_changed(avctx, s)) {
514 avctx->release_buffer(avctx, p);
515 return -1;
516 }
517
518 if (p->key_frame) {
519 p->pict_type = FF_I_TYPE;
520 s->default_models_init(s);
521 for (block=0; block<s->mb_height*s->mb_width; block++)
522 s->macroblocks[block].type = VP56_MB_INTRA;
523 } else {
524 p->pict_type = FF_P_TYPE;
525 vp56_parse_mb_type_models(s);
526 s->parse_vector_models(s);
527 s->mb_type = VP56_MB_INTER_NOVEC_PF;
528 }
529
530 s->parse_coeff_models(s);
531
532 memset(s->prev_dc, 0, sizeof(s->prev_dc));
533 s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
534 s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
535
536 for (block=0; block < 4*s->mb_width+6; block++) {
537 s->above_blocks[block].ref_frame = -1;
538 s->above_blocks[block].dc_coeff = 0;
539 s->above_blocks[block].not_null_dc = 0;
540 }
541 s->above_blocks[2*s->mb_width + 2].ref_frame = 0;
542 s->above_blocks[3*s->mb_width + 4].ref_frame = 0;
543
544 stride_y = p->linesize[0];
545 stride_uv = p->linesize[1];
546
547 if (s->flip < 0)
548 mb_offset = 7;
549
550 /* main macroblocks loop */
551 for (mb_row=0; mb_row<s->mb_height; mb_row++) {
552 if (s->flip < 0)
553 mb_row_flip = s->mb_height - mb_row - 1;
554 else
555 mb_row_flip = mb_row;
556
557 for (block=0; block<4; block++) {
558 s->left_block[block].ref_frame = -1;
559 s->left_block[block].dc_coeff = 0;
560 s->left_block[block].not_null_dc = 0;
561 memset(s->coeff_ctx[block], 0, 64*sizeof(s->coeff_ctx[block][0]));
562 }
563 memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
564
565 s->above_block_idx[0] = 1;
566 s->above_block_idx[1] = 2;
567 s->above_block_idx[2] = 1;
568 s->above_block_idx[3] = 2;
569 s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
570 s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
571
572 s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
573 s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
574 s->block_offset[1] = s->block_offset[0] + 8;
575 s->block_offset[3] = s->block_offset[2] + 8;
576 s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
577 s->block_offset[5] = s->block_offset[4];
578
579 for (mb_col=0; mb_col<s->mb_width; mb_col++) {
580 vp56_decode_mb(s, mb_row, mb_col);
581
582 for (y=0; y<4; y++) {
583 s->above_block_idx[y] += 2;
584 s->block_offset[y] += 16;
585 }
586
587 for (uv=4; uv<6; uv++) {
588 s->above_block_idx[uv] += 1;
589 s->block_offset[uv] += 8;
590 }
591 }
592 }
593
594 if (s->frames[VP56_FRAME_PREVIOUS].data[0]
595 && (s->frames[VP56_FRAME_PREVIOUS].data[0]
596 != s->frames[VP56_FRAME_GOLDEN].data[0])) {
597 avctx->release_buffer(avctx, &s->frames[VP56_FRAME_PREVIOUS]);
598 }
599 if (p->key_frame || golden_frame) {
600 if (s->frames[VP56_FRAME_GOLDEN].data[0])
601 avctx->release_buffer(avctx, &s->frames[VP56_FRAME_GOLDEN]);
602 s->frames[VP56_FRAME_GOLDEN] = *p;
603 }
604 s->frames[VP56_FRAME_PREVIOUS] = *p;
605
606 *picture = *p;
607 *data_size = sizeof(AVPicture);
608
609 return buf_size;
610}
611
612void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip)
613{
614 int i;
615
616 s->avctx = avctx;
617 avctx->pix_fmt = PIX_FMT_YUV420P;
618
619 if (s->avctx->idct_algo == FF_IDCT_AUTO)
620 s->avctx->idct_algo = FF_IDCT_VP3;
621 dsputil_init(&s->dsp, s->avctx);
622 ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
623
624 avcodec_set_dimensions(s->avctx, 0, 0);
625
626 for (i=0; i<3; i++)
627 s->frames[i].data[0] = NULL;
628 s->edge_emu_buffer_alloc = NULL;
629
630 s->above_blocks = NULL;
631 s->macroblocks = NULL;
632 s->quantizer = -1;
633 s->deblock_filtering = 1;
634
635 s->filter = NULL;
636
637 if (flip) {
638 s->flip = -1;
639 s->frbi = 2;
640 s->srbi = 0;
641 } else {
642 s->flip = 1;
643 s->frbi = 0;
644 s->srbi = 2;
645 }
646}
647
648int vp56_free(AVCodecContext *avctx)
649{
650 vp56_context_t *s = avctx->priv_data;
651
652 av_free(s->above_blocks);
653 av_free(s->macroblocks);
654 av_free(s->edge_emu_buffer_alloc);
655 if (s->frames[VP56_FRAME_GOLDEN].data[0]
656 && (s->frames[VP56_FRAME_PREVIOUS].data[0]
657 != s->frames[VP56_FRAME_GOLDEN].data[0]))
658 avctx->release_buffer(avctx, &s->frames[VP56_FRAME_GOLDEN]);
659 if (s->frames[VP56_FRAME_PREVIOUS].data[0])
660 avctx->release_buffer(avctx, &s->frames[VP56_FRAME_PREVIOUS]);
661 return 0;
662}