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 "internal.h"
31
32 #include "vp56.h"
33 #include "vp56data.h"
34 #include "vp5data.h"
35
36
vp5_parse_header(VP56Context * s,const uint8_t * buf,int buf_size)37 static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
38 {
39 VP56RangeCoder *c = &s->c;
40 int rows, cols;
41 int ret;
42
43 ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size);
44 if (ret < 0)
45 return ret;
46 s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
47 vp56_rac_get(c);
48 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
49 if (s->frames[VP56_FRAME_CURRENT]->key_frame)
50 {
51 int render_x, render_y;
52
53 vp56_rac_gets(c, 8);
54 if(vp56_rac_gets(c, 5) > 5)
55 return AVERROR_INVALIDDATA;
56 vp56_rac_gets(c, 2);
57 if (vp56_rac_get(c)) {
58 avpriv_report_missing_feature(s->avctx, "Interlacing");
59 return AVERROR_PATCHWELCOME;
60 }
61 rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
62 cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
63 if (!rows || !cols) {
64 av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
65 cols << 4, rows << 4);
66 return AVERROR_INVALIDDATA;
67 }
68 render_y = vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
69 render_x = vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
70 if (render_x == 0 || render_x > cols ||
71 render_y == 0 || render_y > rows)
72 return AVERROR_INVALIDDATA;
73 vp56_rac_gets(c, 2);
74 if (!s->macroblocks || /* first frame */
75 16*cols != s->avctx->coded_width ||
76 16*rows != s->avctx->coded_height) {
77 int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
78 if (ret < 0)
79 return ret;
80 return VP56_SIZE_CHANGE;
81 }
82 } else if (!s->macroblocks)
83 return AVERROR_INVALIDDATA;
84 return 0;
85 }
86
vp5_parse_vector_adjustment(VP56Context * s,VP56mv * vect)87 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
88 {
89 VP56RangeCoder *c = &s->c;
90 VP56Model *model = s->modelp;
91 int comp, di;
92
93 for (comp=0; comp<2; comp++) {
94 int delta = 0;
95 if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
96 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
97 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
98 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
99 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
100 model->vector_pdv[comp]);
101 delta = di | (delta << 2);
102 delta = (delta ^ -sign) + sign;
103 }
104 if (!comp)
105 vect->x = delta;
106 else
107 vect->y = delta;
108 }
109 }
110
vp5_parse_vector_models(VP56Context * s)111 static void vp5_parse_vector_models(VP56Context *s)
112 {
113 VP56RangeCoder *c = &s->c;
114 VP56Model *model = s->modelp;
115 int comp, node;
116
117 for (comp=0; comp<2; comp++) {
118 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
119 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
120 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
121 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
122 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
123 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
124 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
125 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
126 }
127
128 for (comp=0; comp<2; comp++)
129 for (node=0; node<7; node++)
130 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
131 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
132 }
133
vp5_parse_coeff_models(VP56Context * s)134 static int vp5_parse_coeff_models(VP56Context *s)
135 {
136 VP56RangeCoder *c = &s->c;
137 VP56Model *model = s->modelp;
138 uint8_t def_prob[11];
139 int node, cg, ctx;
140 int ct; /* code type */
141 int pt; /* plane type (0 for Y, 1 for U or V) */
142
143 memset(def_prob, 0x80, sizeof(def_prob));
144
145 for (pt=0; pt<2; pt++)
146 for (node=0; node<11; node++)
147 if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) {
148 def_prob[node] = vp56_rac_gets_nn(c, 7);
149 model->coeff_dccv[pt][node] = def_prob[node];
150 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
151 model->coeff_dccv[pt][node] = def_prob[node];
152 }
153
154 for (ct=0; ct<3; ct++)
155 for (pt=0; pt<2; pt++)
156 for (cg=0; cg<6; cg++)
157 for (node=0; node<11; node++)
158 if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
159 def_prob[node] = vp56_rac_gets_nn(c, 7);
160 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
161 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
162 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
163 }
164
165 /* coeff_dcct is a linear combination of coeff_dccv */
166 for (pt=0; pt<2; pt++)
167 for (ctx=0; ctx<36; ctx++)
168 for (node=0; node<5; node++)
169 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);
170
171 /* coeff_acct is a linear combination of coeff_ract */
172 for (ct=0; ct<3; ct++)
173 for (pt=0; pt<2; pt++)
174 for (cg=0; cg<3; cg++)
175 for (ctx=0; ctx<6; ctx++)
176 for (node=0; node<5; node++)
177 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);
178 return 0;
179 }
180
vp5_parse_coeff(VP56Context * s)181 static int vp5_parse_coeff(VP56Context *s)
182 {
183 VP56RangeCoder *c = &s->c;
184 VP56Model *model = s->modelp;
185 uint8_t *permute = s->idct_scantable;
186 uint8_t *model1, *model2;
187 int coeff, sign, coeff_idx;
188 int b, i, cg, idx, ctx, ctx_last;
189 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
190
191 if (vpX_rac_is_end(c)) {
192 av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
193 return AVERROR_INVALIDDATA;
194 }
195
196 for (b=0; b<6; b++) {
197 int ct = 1; /* code type */
198
199 if (b > 3) pt = 1;
200
201 ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
202 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
203 model1 = model->coeff_dccv[pt];
204 model2 = model->coeff_dcct[pt][ctx];
205
206 coeff_idx = 0;
207 for (;;) {
208 if (vp56_rac_get_prob_branchy(c, model2[0])) {
209 if (vp56_rac_get_prob_branchy(c, model2[2])) {
210 if (vp56_rac_get_prob_branchy(c, model2[3])) {
211 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
212 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
213 sign = vp56_rac_get(c);
214 coeff = ff_vp56_coeff_bias[idx+5];
215 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
216 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
217 } else {
218 if (vp56_rac_get_prob_branchy(c, model2[4])) {
219 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
220 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
221 } else {
222 coeff = 2;
223 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
224 }
225 sign = vp56_rac_get(c);
226 }
227 ct = 2;
228 } else {
229 ct = 1;
230 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
231 sign = vp56_rac_get(c);
232 coeff = 1;
233 }
234 coeff = (coeff ^ -sign) + sign;
235 if (coeff_idx)
236 coeff *= s->dequant_ac;
237 s->block_coeff[b][permute[coeff_idx]] = coeff;
238 } else {
239 if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
240 break;
241 ct = 0;
242 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
243 }
244 coeff_idx++;
245 if (coeff_idx >= 64)
246 break;
247
248 cg = vp5_coeff_groups[coeff_idx];
249 ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
250 model1 = model->coeff_ract[pt][ct][cg];
251 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
252 }
253
254 ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
255 s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
256 if (coeff_idx < ctx_last)
257 for (i=coeff_idx; i<=ctx_last; i++)
258 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
259 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
260 s->idct_selector[b] = 63;
261 }
262 return 0;
263 }
264
vp5_default_models_init(VP56Context * s)265 static void vp5_default_models_init(VP56Context *s)
266 {
267 VP56Model *model = s->modelp;
268 int i;
269
270 for (i=0; i<2; i++) {
271 model->vector_sig[i] = 0x80;
272 model->vector_dct[i] = 0x80;
273 model->vector_pdi[i][0] = 0x55;
274 model->vector_pdi[i][1] = 0x80;
275 }
276 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
277 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
278 }
279
vp5_decode_init(AVCodecContext * avctx)280 static av_cold int vp5_decode_init(AVCodecContext *avctx)
281 {
282 VP56Context *s = avctx->priv_data;
283 int ret;
284
285 if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
286 return ret;
287 ff_vp5dsp_init(&s->vp56dsp);
288 s->vp56_coord_div = vp5_coord_div;
289 s->parse_vector_adjustment = vp5_parse_vector_adjustment;
290 s->parse_coeff = vp5_parse_coeff;
291 s->default_models_init = vp5_default_models_init;
292 s->parse_vector_models = vp5_parse_vector_models;
293 s->parse_coeff_models = vp5_parse_coeff_models;
294 s->parse_header = vp5_parse_header;
295
296 return 0;
297 }
298
299 AVCodec ff_vp5_decoder = {
300 .name = "vp5",
301 .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
302 .type = AVMEDIA_TYPE_VIDEO,
303 .id = AV_CODEC_ID_VP5,
304 .priv_data_size = sizeof(VP56Context),
305 .init = vp5_decode_init,
306 .close = ff_vp56_free,
307 .decode = ff_vp56_decode_frame,
308 .capabilities = AV_CODEC_CAP_DR1,
309 };
310