1 test vector
[libav.git] / libavcodec / vp6.c
CommitLineData
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1/**
2 * @file vp6.c
3 * VP6 compatible video decoder
4 *
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
6 *
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7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
b78e7197 14 * FFmpeg is distributed in the hope that it will be useful,
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15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
b78e7197 20 * License along with FFmpeg; if not, write to the Free Software
5ce117c3 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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22 *
23 *
24 * The VP6F decoder accept an optional 1 byte extradata. It is composed of:
25 * - upper 4bits: difference between encoded width and visible width
26 * - lower 4bits: difference between encoded height and visible height
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27 */
28
29#include <stdlib.h>
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30
31#include "avcodec.h"
32#include "dsputil.h"
33#include "bitstream.h"
34#include "mpegvideo.h"
35
36#include "vp56.h"
37#include "vp56data.h"
38#include "vp6data.h"
39
40
41static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
42 int *golden_frame)
43{
44 vp56_range_coder_t *c = &s->c;
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45 int parse_filter_info = 0;
46 int vrt_shift = 0;
47 int sub_version;
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48 int rows, cols;
49 int res = 1;
50
51 if (buf[0] & 1)
52 return 0;
53
54 s->frames[VP56_FRAME_CURRENT].key_frame = !(buf[0] & 0x80);
55 vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
56
57 if (s->frames[VP56_FRAME_CURRENT].key_frame) {
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58 sub_version = buf[1] >> 3;
59 if (sub_version > 8)
60 return 0;
61 if ((buf[1] & 0x06) != 0x06)
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62 return 0;
63 if (buf[1] & 1) {
64 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
65 return 0;
66 }
67
68 rows = buf[2]; /* number of stored macroblock rows */
69 cols = buf[3]; /* number of stored macroblock cols */
70 /* buf[4] is number of displayed macroblock rows */
71 /* buf[5] is number of displayed macroblock cols */
72
73 if (16*cols != s->avctx->coded_width ||
74 16*rows != s->avctx->coded_height) {
75 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
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76 if (s->avctx->extradata_size == 1) {
77 s->avctx->width -= s->avctx->extradata[0] >> 4;
78 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
79 }
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80 res = 2;
81 }
82
83 vp56_init_range_decoder(c, buf+6, buf_size-6);
84 vp56_rac_gets(c, 2);
85
86 parse_filter_info = 1;
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87 if (sub_version < 8)
88 vrt_shift = 5;
89 s->sub_version = sub_version;
5ce117c3 90 } else {
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91 if (!s->sub_version)
92 return 0;
93
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94 vp56_init_range_decoder(c, buf+1, buf_size-1);
95
96 *golden_frame = vp56_rac_get(c);
97 s->deblock_filtering = vp56_rac_get(c);
98 if (s->deblock_filtering)
99 vp56_rac_get(c);
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100 if (s->sub_version > 7)
101 parse_filter_info = vp56_rac_get(c);
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102 }
103
104 if (parse_filter_info) {
105 if (vp56_rac_get(c)) {
106 s->filter_mode = 2;
9110a0e3 107 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
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108 s->max_vector_length = 2 << vp56_rac_gets(c, 3);
109 } else if (vp56_rac_get(c)) {
110 s->filter_mode = 1;
111 } else {
112 s->filter_mode = 0;
113 }
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114 if (s->sub_version > 7)
115 s->filter_selection = vp56_rac_gets(c, 4);
116 else
117 s->filter_selection = 16;
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118 }
119
120 vp56_rac_get(c);
121 return res;
122}
123
124static void vp6_coeff_order_table_init(vp56_context_t *s)
125{
126 int i, pos, idx = 1;
127
128 s->coeff_index_to_pos[0] = 0;
129 for (i=0; i<16; i++)
130 for (pos=1; pos<64; pos++)
131 if (s->coeff_reorder[pos] == i)
132 s->coeff_index_to_pos[idx++] = pos;
133}
134
135static void vp6_default_models_init(vp56_context_t *s)
136{
137 s->vector_model_dct[0] = 0xA2;
138 s->vector_model_dct[1] = 0xA4;
139 s->vector_model_sig[0] = 0x80;
140 s->vector_model_sig[1] = 0x80;
141
142 memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));
143 memcpy(s->vector_model_fdv, vp6_def_fdv_vector_model, sizeof(s->vector_model_fdv));
144 memcpy(s->vector_model_pdv, vp6_def_pdv_vector_model, sizeof(s->vector_model_pdv));
145 memcpy(s->coeff_model_runv, vp6_def_runv_coeff_model, sizeof(s->coeff_model_runv));
146 memcpy(s->coeff_reorder, vp6_def_coeff_reorder, sizeof(s->coeff_reorder));
147
148 vp6_coeff_order_table_init(s);
149}
150
151static void vp6_parse_vector_models(vp56_context_t *s)
152{
153 vp56_range_coder_t *c = &s->c;
154 int comp, node;
155
156 for (comp=0; comp<2; comp++) {
157 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
158 s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);
159 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
160 s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);
161 }
162
163 for (comp=0; comp<2; comp++)
164 for (node=0; node<7; node++)
165 if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
166 s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
167
168 for (comp=0; comp<2; comp++)
169 for (node=0; node<8; node++)
170 if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
171 s->vector_model_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
172}
173
174static void vp6_parse_coeff_models(vp56_context_t *s)
175{
176 vp56_range_coder_t *c = &s->c;
177 int def_prob[11];
178 int node, cg, ctx, pos;
179 int ct; /* code type */
180 int pt; /* plane type (0 for Y, 1 for U or V) */
181
182 memset(def_prob, 0x80, sizeof(def_prob));
183
184 for (pt=0; pt<2; pt++)
185 for (node=0; node<11; node++)
186 if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
187 def_prob[node] = vp56_rac_gets_nn(c, 7);
188 s->coeff_model_dccv[pt][node] = def_prob[node];
189 } else if (s->frames[VP56_FRAME_CURRENT].key_frame) {
190 s->coeff_model_dccv[pt][node] = def_prob[node];
191 }
192
193 if (vp56_rac_get(c)) {
194 for (pos=1; pos<64; pos++)
195 if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
196 s->coeff_reorder[pos] = vp56_rac_gets(c, 4);
197 vp6_coeff_order_table_init(s);
198 }
199
200 for (cg=0; cg<2; cg++)
201 for (node=0; node<14; node++)
202 if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
203 s->coeff_model_runv[cg][node] = vp56_rac_gets_nn(c, 7);
204
205 for (ct=0; ct<3; ct++)
206 for (pt=0; pt<2; pt++)
207 for (cg=0; cg<6; cg++)
208 for (node=0; node<11; node++)
209 if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
210 def_prob[node] = vp56_rac_gets_nn(c, 7);
211 s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
212 } else if (s->frames[VP56_FRAME_CURRENT].key_frame) {
213 s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
214 }
215
216 /* coeff_model_dcct is a linear combination of coeff_model_dccv */
217 for (pt=0; pt<2; pt++)
218 for (ctx=0; ctx<3; ctx++)
219 for (node=0; node<5; node++)
220 s->coeff_model_dcct[pt][ctx][node] = clip(((s->coeff_model_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
221}
222
d120e402 223static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
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224{
225 vp56_range_coder_t *c = &s->c;
226 int comp;
227
d120e402 228 *vect = (vp56_mv_t) {0,0};
5ce117c3 229 if (s->vector_candidate_pos < 2)
d120e402 230 *vect = s->vector_candidate[0];
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231
232 for (comp=0; comp<2; comp++) {
233 int i, delta = 0;
234
235 if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {
236 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
237 for (i=0; i<sizeof(prob_order); i++) {
238 int j = prob_order[i];
239 delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][j])<<j;
240 }
241 if (delta & 0xF0)
242 delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][3])<<3;
243 else
244 delta |= 8;
245 } else {
246 delta = vp56_rac_get_tree(c, vp56_pva_tree,
247 s->vector_model_pdv[comp]);
248 }
249
250 if (delta && vp56_rac_get_prob(c, s->vector_model_sig[comp]))
251 delta = -delta;
252
253 if (!comp)
d120e402 254 vect->x += delta;
5ce117c3 255 else
d120e402 256 vect->y += delta;
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257 }
258}
259
260static void vp6_parse_coeff(vp56_context_t *s)
261{
262 vp56_range_coder_t *c = &s->c;
263 uint8_t *permute = s->scantable.permutated;
264 uint8_t *model, *model2, *model3;
265 int coeff, sign, coeff_idx;
266 int b, i, cg, idx, ctx;
267 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
268
269 for (b=0; b<6; b++) {
270 int ct = 1; /* code type */
271 int run = 1;
272
273 if (b > 3) pt = 1;
274
275 ctx = s->left_block[vp56_b6to4[b]].not_null_dc
276 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
277 model = s->coeff_model_dccv[pt];
278 model2 = s->coeff_model_dcct[pt][ctx];
279
280 for (coeff_idx=0; coeff_idx<64; ) {
281 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
282 /* parse a coeff */
283 if (coeff_idx == 0) {
284 s->left_block[vp56_b6to4[b]].not_null_dc = 1;
285 s->above_blocks[s->above_block_idx[b]].not_null_dc = 1;
286 }
287
288 if (vp56_rac_get_prob(c, model2[2])) {
289 if (vp56_rac_get_prob(c, model2[3])) {
290 idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
291 coeff = vp56_coeff_bias[idx];
292 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
293 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
294 } else {
295 if (vp56_rac_get_prob(c, model2[4]))
296 coeff = 3 + vp56_rac_get_prob(c, model[5]);
297 else
298 coeff = 2;
299 }
300 ct = 2;
301 } else {
302 ct = 1;
303 coeff = 1;
304 }
305 sign = vp56_rac_get(c);
306 coeff = (coeff ^ -sign) + sign;
307 if (coeff_idx)
308 coeff *= s->dequant_ac;
309 idx = s->coeff_index_to_pos[coeff_idx];
310 s->block_coeff[b][permute[idx]] = coeff;
311 run = 1;
312 } else {
313 /* parse a run */
314 ct = 0;
315 if (coeff_idx == 0) {
316 s->left_block[vp56_b6to4[b]].not_null_dc = 0;
317 s->above_blocks[s->above_block_idx[b]].not_null_dc = 0;
318 } else {
319 if (!vp56_rac_get_prob(c, model2[1]))
320 break;
321
322 model3 = s->coeff_model_runv[coeff_idx >= 6];
323 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
324 if (!run)
325 for (run=9, i=0; i<6; i++)
326 run += vp56_rac_get_prob(c, model3[i+8]) << i;
327 }
328 }
329
330 cg = vp6_coeff_groups[coeff_idx+=run];
331 model = model2 = s->coeff_model_ract[pt][ct][cg];
332 }
333 }
334}
335
336static int vp6_adjust(int v, int t)
337{
338 int V = v, s = v >> 31;
339 V ^= s;
340 V -= s;
341 if (V-t-1 >= (unsigned)(t-1))
342 return v;
343 V = 2*t - V;
344 V += s;
345 V ^= s;
346 return V;
347}
348
349static int vp6_block_variance(uint8_t *src, int stride)
350{
351 int sum = 0, square_sum = 0;
352 int y, x;
353
354 for (y=0; y<8; y+=2) {
355 for (x=0; x<8; x+=2) {
356 sum += src[x];
357 square_sum += src[x]*src[x];
358 }
359 src += 2*stride;
360 }
c29ff23c 361 return (16*square_sum - sum*sum) >> 8;
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362}
363
364static void vp6_filter_hv2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
365 int stride, int delta, int16_t weight)
366{
367 s->dsp.put_pixels_tab[1][0](dst, src, stride, 8);
368 s->dsp.biweight_h264_pixels_tab[3](dst, src+delta, stride, 2,
369 8-weight, weight, 0);
370}
371
372static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
373 int delta, const int16_t *weights)
374{
375 int x, y;
376
377 for (y=0; y<8; y++) {
378 for (x=0; x<8; x++) {
379 dst[x] = clip_uint8(( src[x-delta ] * weights[0]
380 + src[x ] * weights[1]
381 + src[x+delta ] * weights[2]
382 + src[x+2*delta] * weights[3] + 64) >> 7);
383 }
384 src += stride;
385 dst += stride;
386 }
387}
388
389static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
390 int stride, int h_weight, int v_weight)
391{
392 uint8_t *tmp = s->edge_emu_buffer+16;
393 int x, xmax;
394
395 s->dsp.put_pixels_tab[1][0](tmp, src, stride, 8);
396 s->dsp.biweight_h264_pixels_tab[3](tmp, src+1, stride, 2,
397 8-h_weight, h_weight, 0);
398 /* we need a 8x9 block to do vertical filter, so compute one more line */
399 for (x=8*stride, xmax=x+8; x<xmax; x++)
400 tmp[x] = (src[x]*(8-h_weight) + src[x+1]*h_weight + 4) >> 3;
401
402 s->dsp.put_pixels_tab[1][0](dst, tmp, stride, 8);
403 s->dsp.biweight_h264_pixels_tab[3](dst, tmp+stride, stride, 2,
404 8-v_weight, v_weight, 0);
405}
406
407static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
408 const int16_t *h_weights,const int16_t *v_weights)
409{
410 int x, y;
411 int tmp[8*11];
412 int *t = tmp;
413
414 src -= stride;
415
416 for (y=0; y<11; y++) {
417 for (x=0; x<8; x++) {
418 t[x] = clip_uint8(( src[x-1] * h_weights[0]
419 + src[x ] * h_weights[1]
420 + src[x+1] * h_weights[2]
421 + src[x+2] * h_weights[3] + 64) >> 7);
422 }
423 src += stride;
424 t += 8;
425 }
426
427 t = tmp + 8;
428 for (y=0; y<8; y++) {
429 for (x=0; x<8; x++) {
430 dst[x] = clip_uint8(( t[x-8 ] * v_weights[0]
431 + t[x ] * v_weights[1]
432 + t[x+8 ] * v_weights[2]
433 + t[x+16] * v_weights[3] + 64) >> 7);
434 }
435 dst += stride;
436 t += 8;
437 }
438}
439
440static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
441 int offset1, int offset2, int stride,
442 vp56_mv_t mv, int mask, int select, int luma)
443{
444 int filter4 = 0;
445 int x8 = mv.x & mask;
446 int y8 = mv.y & mask;
447
448 if (luma) {
449 x8 *= 2;
450 y8 *= 2;
451 filter4 = s->filter_mode;
452 if (filter4 == 2) {
453 if (s->max_vector_length &&
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454 (FFABS(mv.x) > s->max_vector_length ||
455 FFABS(mv.y) > s->max_vector_length)) {
5ce117c3 456 filter4 = 0;
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457 } else if (s->sample_variance_threshold
458 && (vp6_block_variance(src+offset1, stride)
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459 < s->sample_variance_threshold)) {
460 filter4 = 0;
461 }
462 }
463 }
464
465 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
466 offset1 = offset2;
467 }
468
469 if (filter4) {
470 if (!y8) { /* left or right combine */
471 vp6_filter_hv4(dst, src+offset1, stride, 1,
472 vp6_block_copy_filter[select][x8]);
473 } else if (!x8) { /* above or below combine */
474 vp6_filter_hv4(dst, src+offset1, stride, stride,
475 vp6_block_copy_filter[select][y8]);
476 } else if ((mv.x^mv.y) >> 31) { /* lower-left or upper-right combine */
477 vp6_filter_diag4(dst, src+offset1-1, stride,
478 vp6_block_copy_filter[select][x8],
479 vp6_block_copy_filter[select][y8]);
480 } else { /* lower-right or upper-left combine */
481 vp6_filter_diag4(dst, src+offset1, stride,
482 vp6_block_copy_filter[select][x8],
483 vp6_block_copy_filter[select][y8]);
484 }
485 } else {
486 if (!y8) { /* left or right combine */
487 vp6_filter_hv2(s, dst, src+offset1, stride, 1, x8);
488 } else if (!x8) { /* above or below combine */
489 vp6_filter_hv2(s, dst, src+offset1, stride, stride, y8);
490 } else if ((mv.x^mv.y) >> 31) { /* lower-left or upper-right combine */
491 vp6_filter_diag2(s, dst, src+offset1-1, stride, x8, y8);
492 } else { /* lower-right or upper-left combine */
493 vp6_filter_diag2(s, dst, src+offset1, stride, x8, y8);
494 }
495 }
496}
497
498static int vp6_decode_init(AVCodecContext *avctx)
499{
500 vp56_context_t *s = avctx->priv_data;
501
502 vp56_init(s, avctx, avctx->codec->id == CODEC_ID_VP6);
503 s->vp56_coord_div = vp6_coord_div;
504 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
505 s->adjust = vp6_adjust;
506 s->filter = vp6_filter;
507 s->parse_coeff = vp6_parse_coeff;
508 s->default_models_init = vp6_default_models_init;
509 s->parse_vector_models = vp6_parse_vector_models;
510 s->parse_coeff_models = vp6_parse_coeff_models;
511 s->parse_header = vp6_parse_header;
512
513 return 0;
514}
515
516AVCodec vp6_decoder = {
517 "vp6",
518 CODEC_TYPE_VIDEO,
519 CODEC_ID_VP6,
520 sizeof(vp56_context_t),
521 vp6_decode_init,
522 NULL,
523 vp56_free,
524 vp56_decode_frame,
525};
526
527/* flash version, not flipped upside-down */
528AVCodec vp6f_decoder = {
529 "vp6f",
530 CODEC_TYPE_VIDEO,
531 CODEC_ID_VP6F,
532 sizeof(vp56_context_t),
533 vp6_decode_init,
534 NULL,
535 vp56_free,
536 vp56_decode_frame,
537};