license header consistency cosmetics
[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;
9110a0e3 45 int parse_filter_info = 0;
dd9b8635 46 int coeff_offset = 0;
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47 int vrt_shift = 0;
48 int sub_version;
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49 int rows, cols;
50 int res = 1;
dd9b8635 51 int separated_coeff = buf[0] & 1;
5ce117c3 52
704a2881 53 s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
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54 vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
55
704a2881 56 if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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57 sub_version = buf[1] >> 3;
58 if (sub_version > 8)
59 return 0;
dd9b8635 60 s->filter_header = buf[1] & 0x06;
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61 if (buf[1] & 1) {
62 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
63 return 0;
64 }
dd9b8635 65 if (separated_coeff || !s->filter_header) {
fead30d4 66 coeff_offset = AV_RB16(buf+2) - 2;
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67 buf += 2;
68 buf_size -= 2;
69 }
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70
71 rows = buf[2]; /* number of stored macroblock rows */
72 cols = buf[3]; /* number of stored macroblock cols */
73 /* buf[4] is number of displayed macroblock rows */
74 /* buf[5] is number of displayed macroblock cols */
75
76 if (16*cols != s->avctx->coded_width ||
77 16*rows != s->avctx->coded_height) {
78 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
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79 if (s->avctx->extradata_size == 1) {
80 s->avctx->width -= s->avctx->extradata[0] >> 4;
81 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
82 }
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83 res = 2;
84 }
85
86 vp56_init_range_decoder(c, buf+6, buf_size-6);
87 vp56_rac_gets(c, 2);
88
dd9b8635 89 parse_filter_info = s->filter_header;
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90 if (sub_version < 8)
91 vrt_shift = 5;
92 s->sub_version = sub_version;
5ce117c3 93 } else {
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94 if (!s->sub_version)
95 return 0;
96
dd9b8635 97 if (separated_coeff || !s->filter_header) {
fead30d4 98 coeff_offset = AV_RB16(buf+1) - 2;
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99 buf += 2;
100 buf_size -= 2;
101 }
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102 vp56_init_range_decoder(c, buf+1, buf_size-1);
103
104 *golden_frame = vp56_rac_get(c);
dd9b8635 105 if (s->filter_header) {
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106 s->deblock_filtering = vp56_rac_get(c);
107 if (s->deblock_filtering)
108 vp56_rac_get(c);
109 if (s->sub_version > 7)
110 parse_filter_info = vp56_rac_get(c);
dd9b8635 111 }
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112 }
113
114 if (parse_filter_info) {
115 if (vp56_rac_get(c)) {
116 s->filter_mode = 2;
9110a0e3 117 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
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118 s->max_vector_length = 2 << vp56_rac_gets(c, 3);
119 } else if (vp56_rac_get(c)) {
120 s->filter_mode = 1;
121 } else {
122 s->filter_mode = 0;
123 }
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124 if (s->sub_version > 7)
125 s->filter_selection = vp56_rac_gets(c, 4);
126 else
127 s->filter_selection = 16;
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128 }
129
130 vp56_rac_get(c);
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131
132 if (coeff_offset) {
133 vp56_init_range_decoder(&s->cc, buf+coeff_offset,
134 buf_size-coeff_offset);
135 s->ccp = &s->cc;
136 } else {
137 s->ccp = &s->c;
138 }
139
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140 return res;
141}
142
143static void vp6_coeff_order_table_init(vp56_context_t *s)
144{
145 int i, pos, idx = 1;
146
147 s->coeff_index_to_pos[0] = 0;
148 for (i=0; i<16; i++)
149 for (pos=1; pos<64; pos++)
150 if (s->coeff_reorder[pos] == i)
151 s->coeff_index_to_pos[idx++] = pos;
152}
153
154static void vp6_default_models_init(vp56_context_t *s)
155{
156 s->vector_model_dct[0] = 0xA2;
157 s->vector_model_dct[1] = 0xA4;
158 s->vector_model_sig[0] = 0x80;
159 s->vector_model_sig[1] = 0x80;
160
161 memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));
162 memcpy(s->vector_model_fdv, vp6_def_fdv_vector_model, sizeof(s->vector_model_fdv));
163 memcpy(s->vector_model_pdv, vp6_def_pdv_vector_model, sizeof(s->vector_model_pdv));
164 memcpy(s->coeff_model_runv, vp6_def_runv_coeff_model, sizeof(s->coeff_model_runv));
165 memcpy(s->coeff_reorder, vp6_def_coeff_reorder, sizeof(s->coeff_reorder));
166
167 vp6_coeff_order_table_init(s);
168}
169
170static void vp6_parse_vector_models(vp56_context_t *s)
171{
172 vp56_range_coder_t *c = &s->c;
173 int comp, node;
174
175 for (comp=0; comp<2; comp++) {
176 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
177 s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);
178 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
179 s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);
180 }
181
182 for (comp=0; comp<2; comp++)
183 for (node=0; node<7; node++)
184 if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
185 s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
186
187 for (comp=0; comp<2; comp++)
188 for (node=0; node<8; node++)
189 if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
190 s->vector_model_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
191}
192
193static void vp6_parse_coeff_models(vp56_context_t *s)
194{
195 vp56_range_coder_t *c = &s->c;
196 int def_prob[11];
197 int node, cg, ctx, pos;
198 int ct; /* code type */
199 int pt; /* plane type (0 for Y, 1 for U or V) */
200
201 memset(def_prob, 0x80, sizeof(def_prob));
202
203 for (pt=0; pt<2; pt++)
204 for (node=0; node<11; node++)
205 if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
206 def_prob[node] = vp56_rac_gets_nn(c, 7);
207 s->coeff_model_dccv[pt][node] = def_prob[node];
704a2881 208 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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209 s->coeff_model_dccv[pt][node] = def_prob[node];
210 }
211
212 if (vp56_rac_get(c)) {
213 for (pos=1; pos<64; pos++)
214 if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
215 s->coeff_reorder[pos] = vp56_rac_gets(c, 4);
216 vp6_coeff_order_table_init(s);
217 }
218
219 for (cg=0; cg<2; cg++)
220 for (node=0; node<14; node++)
221 if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
222 s->coeff_model_runv[cg][node] = vp56_rac_gets_nn(c, 7);
223
224 for (ct=0; ct<3; ct++)
225 for (pt=0; pt<2; pt++)
226 for (cg=0; cg<6; cg++)
227 for (node=0; node<11; node++)
228 if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
229 def_prob[node] = vp56_rac_gets_nn(c, 7);
230 s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
704a2881 231 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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232 s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
233 }
234
235 /* coeff_model_dcct is a linear combination of coeff_model_dccv */
236 for (pt=0; pt<2; pt++)
237 for (ctx=0; ctx<3; ctx++)
238 for (node=0; node<5; node++)
f66e4f5f 239 s->coeff_model_dcct[pt][ctx][node] = av_clip(((s->coeff_model_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
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240}
241
d120e402 242static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
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243{
244 vp56_range_coder_t *c = &s->c;
245 int comp;
246
d120e402 247 *vect = (vp56_mv_t) {0,0};
5ce117c3 248 if (s->vector_candidate_pos < 2)
d120e402 249 *vect = s->vector_candidate[0];
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250
251 for (comp=0; comp<2; comp++) {
252 int i, delta = 0;
253
254 if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {
255 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
256 for (i=0; i<sizeof(prob_order); i++) {
257 int j = prob_order[i];
258 delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][j])<<j;
259 }
260 if (delta & 0xF0)
261 delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][3])<<3;
262 else
263 delta |= 8;
264 } else {
265 delta = vp56_rac_get_tree(c, vp56_pva_tree,
266 s->vector_model_pdv[comp]);
267 }
268
269 if (delta && vp56_rac_get_prob(c, s->vector_model_sig[comp]))
270 delta = -delta;
271
272 if (!comp)
d120e402 273 vect->x += delta;
5ce117c3 274 else
d120e402 275 vect->y += delta;
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276 }
277}
278
279static void vp6_parse_coeff(vp56_context_t *s)
280{
dd9b8635 281 vp56_range_coder_t *c = s->ccp;
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282 uint8_t *permute = s->scantable.permutated;
283 uint8_t *model, *model2, *model3;
284 int coeff, sign, coeff_idx;
285 int b, i, cg, idx, ctx;
286 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
287
288 for (b=0; b<6; b++) {
289 int ct = 1; /* code type */
290 int run = 1;
291
292 if (b > 3) pt = 1;
293
294 ctx = s->left_block[vp56_b6to4[b]].not_null_dc
295 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
296 model = s->coeff_model_dccv[pt];
297 model2 = s->coeff_model_dcct[pt][ctx];
298
299 for (coeff_idx=0; coeff_idx<64; ) {
300 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
301 /* parse a coeff */
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302 if (vp56_rac_get_prob(c, model2[2])) {
303 if (vp56_rac_get_prob(c, model2[3])) {
304 idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
305 coeff = vp56_coeff_bias[idx];
306 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
307 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
308 } else {
309 if (vp56_rac_get_prob(c, model2[4]))
310 coeff = 3 + vp56_rac_get_prob(c, model[5]);
311 else
312 coeff = 2;
313 }
314 ct = 2;
315 } else {
316 ct = 1;
317 coeff = 1;
318 }
319 sign = vp56_rac_get(c);
320 coeff = (coeff ^ -sign) + sign;
321 if (coeff_idx)
322 coeff *= s->dequant_ac;
323 idx = s->coeff_index_to_pos[coeff_idx];
324 s->block_coeff[b][permute[idx]] = coeff;
325 run = 1;
326 } else {
327 /* parse a run */
328 ct = 0;
4b8419aa 329 if (coeff_idx > 0) {
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330 if (!vp56_rac_get_prob(c, model2[1]))
331 break;
332
333 model3 = s->coeff_model_runv[coeff_idx >= 6];
334 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
335 if (!run)
336 for (run=9, i=0; i<6; i++)
337 run += vp56_rac_get_prob(c, model3[i+8]) << i;
338 }
339 }
340
341 cg = vp6_coeff_groups[coeff_idx+=run];
342 model = model2 = s->coeff_model_ract[pt][ct][cg];
343 }
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344
345 s->left_block[vp56_b6to4[b]].not_null_dc =
346 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
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347 }
348}
349
350static int vp6_adjust(int v, int t)
351{
352 int V = v, s = v >> 31;
353 V ^= s;
354 V -= s;
355 if (V-t-1 >= (unsigned)(t-1))
356 return v;
357 V = 2*t - V;
358 V += s;
359 V ^= s;
360 return V;
361}
362
363static int vp6_block_variance(uint8_t *src, int stride)
364{
365 int sum = 0, square_sum = 0;
366 int y, x;
367
368 for (y=0; y<8; y+=2) {
369 for (x=0; x<8; x+=2) {
370 sum += src[x];
371 square_sum += src[x]*src[x];
372 }
373 src += 2*stride;
374 }
c29ff23c 375 return (16*square_sum - sum*sum) >> 8;
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376}
377
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378static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
379 int delta, const int16_t *weights)
380{
381 int x, y;
382
383 for (y=0; y<8; y++) {
384 for (x=0; x<8; x++) {
f66e4f5f 385 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
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386 + src[x ] * weights[1]
387 + src[x+delta ] * weights[2]
388 + src[x+2*delta] * weights[3] + 64) >> 7);
389 }
390 src += stride;
391 dst += stride;
392 }
393}
394
395static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
396 int stride, int h_weight, int v_weight)
397{
398 uint8_t *tmp = s->edge_emu_buffer+16;
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399 s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
400 s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
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401}
402
403static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
404 const int16_t *h_weights,const int16_t *v_weights)
405{
406 int x, y;
407 int tmp[8*11];
408 int *t = tmp;
409
410 src -= stride;
411
412 for (y=0; y<11; y++) {
413 for (x=0; x<8; x++) {
f66e4f5f 414 t[x] = av_clip_uint8(( src[x-1] * h_weights[0]
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415 + src[x ] * h_weights[1]
416 + src[x+1] * h_weights[2]
417 + src[x+2] * h_weights[3] + 64) >> 7);
418 }
419 src += stride;
420 t += 8;
421 }
422
423 t = tmp + 8;
424 for (y=0; y<8; y++) {
425 for (x=0; x<8; x++) {
f66e4f5f 426 dst[x] = av_clip_uint8(( t[x-8 ] * v_weights[0]
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427 + t[x ] * v_weights[1]
428 + t[x+8 ] * v_weights[2]
429 + t[x+16] * v_weights[3] + 64) >> 7);
430 }
431 dst += stride;
432 t += 8;
433 }
434}
435
436static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
437 int offset1, int offset2, int stride,
438 vp56_mv_t mv, int mask, int select, int luma)
439{
440 int filter4 = 0;
441 int x8 = mv.x & mask;
442 int y8 = mv.y & mask;
443
444 if (luma) {
445 x8 *= 2;
446 y8 *= 2;
447 filter4 = s->filter_mode;
448 if (filter4 == 2) {
449 if (s->max_vector_length &&
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450 (FFABS(mv.x) > s->max_vector_length ||
451 FFABS(mv.y) > s->max_vector_length)) {
5ce117c3 452 filter4 = 0;
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453 } else if (s->sample_variance_threshold
454 && (vp6_block_variance(src+offset1, stride)
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455 < s->sample_variance_threshold)) {
456 filter4 = 0;
457 }
458 }
459 }
460
461 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
462 offset1 = offset2;
463 }
464
465 if (filter4) {
466 if (!y8) { /* left or right combine */
467 vp6_filter_hv4(dst, src+offset1, stride, 1,
468 vp6_block_copy_filter[select][x8]);
469 } else if (!x8) { /* above or below combine */
470 vp6_filter_hv4(dst, src+offset1, stride, stride,
471 vp6_block_copy_filter[select][y8]);
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472 } else {
473 vp6_filter_diag4(dst, src+offset1 + ((mv.x^mv.y)>>31), stride,
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474 vp6_block_copy_filter[select][x8],
475 vp6_block_copy_filter[select][y8]);
476 }
477 } else {
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478 if (!x8 || !y8) {
479 s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
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480 } else {
481 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
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482 }
483 }
484}
485
486static int vp6_decode_init(AVCodecContext *avctx)
487{
488 vp56_context_t *s = avctx->priv_data;
489
490 vp56_init(s, avctx, avctx->codec->id == CODEC_ID_VP6);
491 s->vp56_coord_div = vp6_coord_div;
492 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
493 s->adjust = vp6_adjust;
494 s->filter = vp6_filter;
495 s->parse_coeff = vp6_parse_coeff;
496 s->default_models_init = vp6_default_models_init;
497 s->parse_vector_models = vp6_parse_vector_models;
498 s->parse_coeff_models = vp6_parse_coeff_models;
499 s->parse_header = vp6_parse_header;
500
501 return 0;
502}
503
504AVCodec vp6_decoder = {
505 "vp6",
506 CODEC_TYPE_VIDEO,
507 CODEC_ID_VP6,
508 sizeof(vp56_context_t),
509 vp6_decode_init,
510 NULL,
511 vp56_free,
512 vp56_decode_frame,
75f6cc26 513 CODEC_CAP_DR1,
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514};
515
516/* flash version, not flipped upside-down */
517AVCodec vp6f_decoder = {
518 "vp6f",
519 CODEC_TYPE_VIDEO,
520 CODEC_ID_VP6F,
521 sizeof(vp56_context_t),
522 vp6_decode_init,
523 NULL,
524 vp56_free,
525 vp56_decode_frame,
75f6cc26 526 CODEC_CAP_DR1,
5ce117c3 527};