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1 | /* |
2 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | /** | |
22 | * @file | |
23 | * VP5 compatible video decoder | |
24 | */ | |
25 | ||
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | ||
29 | #include "avcodec.h" | |
30 | #include "get_bits.h" | |
31 | #include "internal.h" | |
32 | ||
33 | #include "vp56.h" | |
34 | #include "vp56data.h" | |
35 | #include "vp5data.h" | |
36 | ||
37 | ||
38 | static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) | |
39 | { | |
40 | VP56RangeCoder *c = &s->c; | |
41 | int rows, cols; | |
42 | ||
43 | ff_vp56_init_range_decoder(&s->c, buf, buf_size); | |
44 | s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c); | |
45 | vp56_rac_get(c); | |
46 | ff_vp56_init_dequant(s, vp56_rac_gets(c, 6)); | |
47 | if (s->frames[VP56_FRAME_CURRENT]->key_frame) | |
48 | { | |
49 | vp56_rac_gets(c, 8); | |
50 | if(vp56_rac_gets(c, 5) > 5) | |
51 | return AVERROR_INVALIDDATA; | |
52 | vp56_rac_gets(c, 2); | |
53 | if (vp56_rac_get(c)) { | |
54 | av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n"); | |
55 | return AVERROR_PATCHWELCOME; | |
56 | } | |
57 | rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */ | |
58 | cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */ | |
59 | if (!rows || !cols) { | |
60 | av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", | |
61 | cols << 4, rows << 4); | |
62 | return AVERROR_INVALIDDATA; | |
63 | } | |
64 | vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ | |
65 | vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ | |
66 | vp56_rac_gets(c, 2); | |
67 | if (!s->macroblocks || /* first frame */ | |
68 | 16*cols != s->avctx->coded_width || | |
69 | 16*rows != s->avctx->coded_height) { | |
70 | int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows); | |
71 | if (ret < 0) | |
72 | return ret; | |
73 | return VP56_SIZE_CHANGE; | |
74 | } | |
75 | } else if (!s->macroblocks) | |
76 | return AVERROR_INVALIDDATA; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect) | |
81 | { | |
82 | VP56RangeCoder *c = &s->c; | |
83 | VP56Model *model = s->modelp; | |
84 | int comp, di; | |
85 | ||
86 | for (comp=0; comp<2; comp++) { | |
87 | int delta = 0; | |
88 | if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) { | |
89 | int sign = vp56_rac_get_prob(c, model->vector_sig[comp]); | |
90 | di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]); | |
91 | di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1; | |
92 | delta = vp56_rac_get_tree(c, ff_vp56_pva_tree, | |
93 | model->vector_pdv[comp]); | |
94 | delta = di | (delta << 2); | |
95 | delta = (delta ^ -sign) + sign; | |
96 | } | |
97 | if (!comp) | |
98 | vect->x = delta; | |
99 | else | |
100 | vect->y = delta; | |
101 | } | |
102 | } | |
103 | ||
104 | static void vp5_parse_vector_models(VP56Context *s) | |
105 | { | |
106 | VP56RangeCoder *c = &s->c; | |
107 | VP56Model *model = s->modelp; | |
108 | int comp, node; | |
109 | ||
110 | for (comp=0; comp<2; comp++) { | |
111 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0])) | |
112 | model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); | |
113 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1])) | |
114 | model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); | |
115 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2])) | |
116 | model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7); | |
117 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3])) | |
118 | model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7); | |
119 | } | |
120 | ||
121 | for (comp=0; comp<2; comp++) | |
122 | for (node=0; node<7; node++) | |
123 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node])) | |
124 | model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); | |
125 | } | |
126 | ||
127 | static int vp5_parse_coeff_models(VP56Context *s) | |
128 | { | |
129 | VP56RangeCoder *c = &s->c; | |
130 | VP56Model *model = s->modelp; | |
131 | uint8_t def_prob[11]; | |
132 | int node, cg, ctx; | |
133 | int ct; /* code type */ | |
134 | int pt; /* plane type (0 for Y, 1 for U or V) */ | |
135 | ||
136 | memset(def_prob, 0x80, sizeof(def_prob)); | |
137 | ||
138 | for (pt=0; pt<2; pt++) | |
139 | for (node=0; node<11; node++) | |
140 | if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) { | |
141 | def_prob[node] = vp56_rac_gets_nn(c, 7); | |
142 | model->coeff_dccv[pt][node] = def_prob[node]; | |
143 | } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { | |
144 | model->coeff_dccv[pt][node] = def_prob[node]; | |
145 | } | |
146 | ||
147 | for (ct=0; ct<3; ct++) | |
148 | for (pt=0; pt<2; pt++) | |
149 | for (cg=0; cg<6; cg++) | |
150 | for (node=0; node<11; node++) | |
151 | if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) { | |
152 | def_prob[node] = vp56_rac_gets_nn(c, 7); | |
153 | model->coeff_ract[pt][ct][cg][node] = def_prob[node]; | |
154 | } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { | |
155 | model->coeff_ract[pt][ct][cg][node] = def_prob[node]; | |
156 | } | |
157 | ||
158 | /* coeff_dcct is a linear combination of coeff_dccv */ | |
159 | for (pt=0; pt<2; pt++) | |
160 | for (ctx=0; ctx<36; ctx++) | |
161 | for (node=0; node<5; node++) | |
162 | model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254); | |
163 | ||
164 | /* coeff_acct is a linear combination of coeff_ract */ | |
165 | for (ct=0; ct<3; ct++) | |
166 | for (pt=0; pt<2; pt++) | |
167 | for (cg=0; cg<3; cg++) | |
168 | for (ctx=0; ctx<6; ctx++) | |
169 | for (node=0; node<5; node++) | |
170 | model->coeff_acct[pt][ct][cg][ctx][node] = av_clip(((model->coeff_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static void vp5_parse_coeff(VP56Context *s) | |
175 | { | |
176 | VP56RangeCoder *c = &s->c; | |
177 | VP56Model *model = s->modelp; | |
178 | uint8_t *permute = s->idct_scantable; | |
179 | uint8_t *model1, *model2; | |
180 | int coeff, sign, coeff_idx; | |
181 | int b, i, cg, idx, ctx, ctx_last; | |
182 | int pt = 0; /* plane type (0 for Y, 1 for U or V) */ | |
183 | ||
184 | for (b=0; b<6; b++) { | |
185 | int ct = 1; /* code type */ | |
186 | ||
187 | if (b > 3) pt = 1; | |
188 | ||
189 | ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] | |
190 | + s->above_blocks[s->above_block_idx[b]].not_null_dc; | |
191 | model1 = model->coeff_dccv[pt]; | |
192 | model2 = model->coeff_dcct[pt][ctx]; | |
193 | ||
194 | coeff_idx = 0; | |
195 | for (;;) { | |
196 | if (vp56_rac_get_prob_branchy(c, model2[0])) { | |
197 | if (vp56_rac_get_prob_branchy(c, model2[2])) { | |
198 | if (vp56_rac_get_prob_branchy(c, model2[3])) { | |
199 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; | |
200 | idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); | |
201 | sign = vp56_rac_get(c); | |
202 | coeff = ff_vp56_coeff_bias[idx+5]; | |
203 | for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) | |
204 | coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; | |
205 | } else { | |
206 | if (vp56_rac_get_prob_branchy(c, model2[4])) { | |
207 | coeff = 3 + vp56_rac_get_prob(c, model1[5]); | |
208 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; | |
209 | } else { | |
210 | coeff = 2; | |
211 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; | |
212 | } | |
213 | sign = vp56_rac_get(c); | |
214 | } | |
215 | ct = 2; | |
216 | } else { | |
217 | ct = 1; | |
218 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; | |
219 | sign = vp56_rac_get(c); | |
220 | coeff = 1; | |
221 | } | |
222 | coeff = (coeff ^ -sign) + sign; | |
223 | if (coeff_idx) | |
224 | coeff *= s->dequant_ac; | |
225 | s->block_coeff[b][permute[coeff_idx]] = coeff; | |
226 | } else { | |
227 | if (ct && !vp56_rac_get_prob_branchy(c, model2[1])) | |
228 | break; | |
229 | ct = 0; | |
230 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; | |
231 | } | |
232 | coeff_idx++; | |
233 | if (coeff_idx >= 64) | |
234 | break; | |
235 | ||
236 | cg = vp5_coeff_groups[coeff_idx]; | |
237 | ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; | |
238 | model1 = model->coeff_ract[pt][ct][cg]; | |
239 | model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; | |
240 | } | |
241 | ||
242 | ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); | |
243 | s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; | |
244 | if (coeff_idx < ctx_last) | |
245 | for (i=coeff_idx; i<=ctx_last; i++) | |
246 | s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; | |
247 | s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; | |
248 | } | |
249 | } | |
250 | ||
251 | static void vp5_default_models_init(VP56Context *s) | |
252 | { | |
253 | VP56Model *model = s->modelp; | |
254 | int i; | |
255 | ||
256 | for (i=0; i<2; i++) { | |
257 | model->vector_sig[i] = 0x80; | |
258 | model->vector_dct[i] = 0x80; | |
259 | model->vector_pdi[i][0] = 0x55; | |
260 | model->vector_pdi[i][1] = 0x80; | |
261 | } | |
262 | memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); | |
263 | memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv)); | |
264 | } | |
265 | ||
266 | static av_cold int vp5_decode_init(AVCodecContext *avctx) | |
267 | { | |
268 | VP56Context *s = avctx->priv_data; | |
269 | int ret; | |
270 | ||
271 | if ((ret = ff_vp56_init(avctx, 1, 0)) < 0) | |
272 | return ret; | |
273 | s->vp56_coord_div = vp5_coord_div; | |
274 | s->parse_vector_adjustment = vp5_parse_vector_adjustment; | |
275 | s->parse_coeff = vp5_parse_coeff; | |
276 | s->default_models_init = vp5_default_models_init; | |
277 | s->parse_vector_models = vp5_parse_vector_models; | |
278 | s->parse_coeff_models = vp5_parse_coeff_models; | |
279 | s->parse_header = vp5_parse_header; | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | AVCodec ff_vp5_decoder = { | |
285 | .name = "vp5", | |
286 | .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"), | |
287 | .type = AVMEDIA_TYPE_VIDEO, | |
288 | .id = AV_CODEC_ID_VP5, | |
289 | .priv_data_size = sizeof(VP56Context), | |
290 | .init = vp5_decode_init, | |
291 | .close = ff_vp56_free, | |
292 | .decode = ff_vp56_decode_frame, | |
293 | .capabilities = CODEC_CAP_DR1, | |
294 | }; |