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5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
1 /**
2 * @file vp6.c
3 * VP6 compatible video decoder
4 *
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
6 *
b78e719 @DonDiego Change license headers to say 'FFmpeg' instead of 'this program/this …
DonDiego authored
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
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 *
b78e719 @DonDiego Change license headers to say 'FFmpeg' instead of 'this program/this …
DonDiego authored
14 * FFmpeg is distributed in the hope that it will be useful,
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
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
b78e719 @DonDiego Change license headers to say 'FFmpeg' instead of 'this program/this …
DonDiego authored
20 * License along with FFmpeg; if not, write to the Free Software
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
246f86a @aurelj document the extradata protocol for VP6F
aurelj authored
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
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
27 */
28
29 #include <stdlib.h>
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
41 static 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;
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46 int coeff_offset = 0;
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47 int vrt_shift = 0;
48 int sub_version;
5ce117c @aurelj VP5 and VP6 video decoder
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49 int rows, cols;
50 int res = 1;
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51 int separated_coeff = buf[0] & 1;
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52
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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
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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;
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60 s->filter_header = buf[1] & 0x06;
5ce117c @aurelj VP5 and VP6 video decoder
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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 }
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65 if (separated_coeff || !s->filter_header) {
fead30d @axic rename BE/LE_8/16/32 to AV_RL/B_8/16/32
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66 coeff_offset = AV_RB16(buf+2) - 2;
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67 buf += 2;
68 buf_size -= 2;
69 }
5ce117c @aurelj VP5 and VP6 video decoder
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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 }
5ce117c @aurelj VP5 and VP6 video decoder
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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
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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;
5ce117c @aurelj VP5 and VP6 video decoder
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93 } else {
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94 if (!s->sub_version)
95 return 0;
96
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97 if (separated_coeff || !s->filter_header) {
fead30d @axic rename BE/LE_8/16/32 to AV_RL/B_8/16/32
axic authored
98 coeff_offset = AV_RB16(buf+1) - 2;
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99 buf += 2;
100 buf_size -= 2;
101 }
5ce117c @aurelj VP5 and VP6 video decoder
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102 vp56_init_range_decoder(c, buf+1, buf_size-1);
103
104 *golden_frame = vp56_rac_get(c);
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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);
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111 }
5ce117c @aurelj VP5 and VP6 video decoder
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112 }
113
114 if (parse_filter_info) {
115 if (vp56_rac_get(c)) {
116 s->filter_mode = 2;
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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 }
9110a0e @aurelj Add support for VP60 and VP61.
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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;
5ce117c @aurelj VP5 and VP6 video decoder
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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
5ce117c @aurelj VP5 and VP6 video decoder
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140 return res;
141 }
142
143 static 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
154 static 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
170 static 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
193 static 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];
704a288 @aurelj Use pointers to avoid copying AVFrame.
aurelj authored
208 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
5ce117c @aurelj VP5 and VP6 video decoder
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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];
704a288 @aurelj Use pointers to avoid copying AVFrame.
aurelj authored
231 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
5ce117c @aurelj VP5 and VP6 video decoder
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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++)
f66e4f5 Add av_ prefix to clip functions
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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
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242 static 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
d120e40 @aurelj rename vector to vect to avoid clash with Apple gcc
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247 *vect = (vp56_mv_t) {0,0};
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248 if (s->vector_candidate_pos < 2)
d120e40 @aurelj rename vector to vect to avoid clash with Apple gcc
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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)
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273 vect->x += delta;
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274 else
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275 vect->y += delta;
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276 }
277 }
278
279 static void vp6_parse_coeff(vp56_context_t *s)
280 {
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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 */
302 if (coeff_idx == 0) {
303 s->left_block[vp56_b6to4[b]].not_null_dc = 1;
304 s->above_blocks[s->above_block_idx[b]].not_null_dc = 1;
305 }
306
307 if (vp56_rac_get_prob(c, model2[2])) {
308 if (vp56_rac_get_prob(c, model2[3])) {
309 idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
310 coeff = vp56_coeff_bias[idx];
311 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
312 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
313 } else {
314 if (vp56_rac_get_prob(c, model2[4]))
315 coeff = 3 + vp56_rac_get_prob(c, model[5]);
316 else
317 coeff = 2;
318 }
319 ct = 2;
320 } else {
321 ct = 1;
322 coeff = 1;
323 }
324 sign = vp56_rac_get(c);
325 coeff = (coeff ^ -sign) + sign;
326 if (coeff_idx)
327 coeff *= s->dequant_ac;
328 idx = s->coeff_index_to_pos[coeff_idx];
329 s->block_coeff[b][permute[idx]] = coeff;
330 run = 1;
331 } else {
332 /* parse a run */
333 ct = 0;
334 if (coeff_idx == 0) {
335 s->left_block[vp56_b6to4[b]].not_null_dc = 0;
336 s->above_blocks[s->above_block_idx[b]].not_null_dc = 0;
337 } else {
338 if (!vp56_rac_get_prob(c, model2[1]))
339 break;
340
341 model3 = s->coeff_model_runv[coeff_idx >= 6];
342 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
343 if (!run)
344 for (run=9, i=0; i<6; i++)
345 run += vp56_rac_get_prob(c, model3[i+8]) << i;
346 }
347 }
348
349 cg = vp6_coeff_groups[coeff_idx+=run];
350 model = model2 = s->coeff_model_ract[pt][ct][cg];
351 }
352 }
353 }
354
355 static int vp6_adjust(int v, int t)
356 {
357 int V = v, s = v >> 31;
358 V ^= s;
359 V -= s;
360 if (V-t-1 >= (unsigned)(t-1))
361 return v;
362 V = 2*t - V;
363 V += s;
364 V ^= s;
365 return V;
366 }
367
368 static int vp6_block_variance(uint8_t *src, int stride)
369 {
370 int sum = 0, square_sum = 0;
371 int y, x;
372
373 for (y=0; y<8; y+=2) {
374 for (x=0; x<8; x+=2) {
375 sum += src[x];
376 square_sum += src[x]*src[x];
377 }
378 src += 2*stride;
379 }
c29ff23 @aurelj small optimization
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380 return (16*square_sum - sum*sum) >> 8;
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381 }
382
383 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
384 int delta, const int16_t *weights)
385 {
386 int x, y;
387
388 for (y=0; y<8; y++) {
389 for (x=0; x<8; x++) {
f66e4f5 Add av_ prefix to clip functions
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390 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
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391 + src[x ] * weights[1]
392 + src[x+delta ] * weights[2]
393 + src[x+2*delta] * weights[3] + 64) >> 7);
394 }
395 src += stride;
396 dst += stride;
397 }
398 }
399
400 static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
401 int stride, int h_weight, int v_weight)
402 {
403 uint8_t *tmp = s->edge_emu_buffer+16;
6ec4818 faster and simpler vp6 bilinear mc
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404 s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
405 s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
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406 }
407
408 static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
409 const int16_t *h_weights,const int16_t *v_weights)
410 {
411 int x, y;
412 int tmp[8*11];
413 int *t = tmp;
414
415 src -= stride;
416
417 for (y=0; y<11; y++) {
418 for (x=0; x<8; x++) {
f66e4f5 Add av_ prefix to clip functions
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419 t[x] = av_clip_uint8(( src[x-1] * h_weights[0]
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420 + src[x ] * h_weights[1]
421 + src[x+1] * h_weights[2]
422 + src[x+2] * h_weights[3] + 64) >> 7);
423 }
424 src += stride;
425 t += 8;
426 }
427
428 t = tmp + 8;
429 for (y=0; y<8; y++) {
430 for (x=0; x<8; x++) {
f66e4f5 Add av_ prefix to clip functions
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431 dst[x] = av_clip_uint8(( t[x-8 ] * v_weights[0]
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432 + t[x ] * v_weights[1]
433 + t[x+8 ] * v_weights[2]
434 + t[x+16] * v_weights[3] + 64) >> 7);
435 }
436 dst += stride;
437 t += 8;
438 }
439 }
440
441 static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
442 int offset1, int offset2, int stride,
443 vp56_mv_t mv, int mask, int select, int luma)
444 {
445 int filter4 = 0;
446 int x8 = mv.x & mask;
447 int y8 = mv.y & mask;
448
449 if (luma) {
450 x8 *= 2;
451 y8 *= 2;
452 filter4 = s->filter_mode;
453 if (filter4 == 2) {
454 if (s->max_vector_length &&
c26abfa @DonDiego Rename ABS macro to FFABS.
DonDiego authored
455 (FFABS(mv.x) > s->max_vector_length ||
456 FFABS(mv.y) > s->max_vector_length)) {
5ce117c @aurelj VP5 and VP6 video decoder
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457 filter4 = 0;
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aurelj authored
458 } else if (s->sample_variance_threshold
459 && (vp6_block_variance(src+offset1, stride)
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
460 < s->sample_variance_threshold)) {
461 filter4 = 0;
462 }
463 }
464 }
465
466 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
467 offset1 = offset2;
468 }
469
470 if (filter4) {
471 if (!y8) { /* left or right combine */
472 vp6_filter_hv4(dst, src+offset1, stride, 1,
473 vp6_block_copy_filter[select][x8]);
474 } else if (!x8) { /* above or below combine */
475 vp6_filter_hv4(dst, src+offset1, stride, stride,
476 vp6_block_copy_filter[select][y8]);
cd66ddb simplify
Loren Merritt authored
477 } else {
478 vp6_filter_diag4(dst, src+offset1 + ((mv.x^mv.y)>>31), stride,
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
479 vp6_block_copy_filter[select][x8],
480 vp6_block_copy_filter[select][y8]);
481 }
482 } else {
6ec4818 faster and simpler vp6 bilinear mc
Loren Merritt authored
483 if (!x8 || !y8) {
484 s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
cd66ddb simplify
Loren Merritt authored
485 } else {
486 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
487 }
488 }
489 }
490
491 static int vp6_decode_init(AVCodecContext *avctx)
492 {
493 vp56_context_t *s = avctx->priv_data;
494
495 vp56_init(s, avctx, avctx->codec->id == CODEC_ID_VP6);
496 s->vp56_coord_div = vp6_coord_div;
497 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
498 s->adjust = vp6_adjust;
499 s->filter = vp6_filter;
500 s->parse_coeff = vp6_parse_coeff;
501 s->default_models_init = vp6_default_models_init;
502 s->parse_vector_models = vp6_parse_vector_models;
503 s->parse_coeff_models = vp6_parse_coeff_models;
504 s->parse_header = vp6_parse_header;
505
506 return 0;
507 }
508
509 AVCodec vp6_decoder = {
510 "vp6",
511 CODEC_TYPE_VIDEO,
512 CODEC_ID_VP6,
513 sizeof(vp56_context_t),
514 vp6_decode_init,
515 NULL,
516 vp56_free,
517 vp56_decode_frame,
75f6cc2 @aurelj set CODEC_CAP_DR1 for vp5 and vp6 decoders
aurelj authored
518 CODEC_CAP_DR1,
5ce117c @aurelj VP5 and VP6 video decoder
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519 };
520
521 /* flash version, not flipped upside-down */
522 AVCodec vp6f_decoder = {
523 "vp6f",
524 CODEC_TYPE_VIDEO,
525 CODEC_ID_VP6F,
526 sizeof(vp56_context_t),
527 vp6_decode_init,
528 NULL,
529 vp56_free,
530 vp56_decode_frame,
75f6cc2 @aurelj set CODEC_CAP_DR1 for vp5 and vp6 decoders
aurelj authored
531 CODEC_CAP_DR1,
5ce117c @aurelj VP5 and VP6 video decoder
aurelj authored
532 };
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