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 "codec_internal.h"
31 #include "internal.h"
32
33 #include "vp56.h"
34 #include "vp56data.h"
35 #include "vp5data.h"
36
37
vp5_parse_header(VP56Context * s,const uint8_t * buf,int buf_size)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 int ret;
43
44 ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size);
45 if (ret < 0)
46 return ret;
47 s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
48 vp56_rac_get(c);
49 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
50 if (s->frames[VP56_FRAME_CURRENT]->key_frame)
51 {
52 int render_x, render_y;
53
54 vp56_rac_gets(c, 8);
55 if(vp56_rac_gets(c, 5) > 5)
56 return AVERROR_INVALIDDATA;
57 vp56_rac_gets(c, 2);
58 if (vp56_rac_get(c)) {
59 avpriv_report_missing_feature(s->avctx, "Interlacing");
60 return AVERROR_PATCHWELCOME;
61 }
62 rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
63 cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
64 if (!rows || !cols) {
65 av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
66 cols << 4, rows << 4);
67 return AVERROR_INVALIDDATA;
68 }
69 render_y = vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
70 render_x = vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
71 if (render_x == 0 || render_x > cols ||
72 render_y == 0 || render_y > rows)
73 return AVERROR_INVALIDDATA;
74 vp56_rac_gets(c, 2);
75 if (!s->macroblocks || /* first frame */
76 16*cols != s->avctx->coded_width ||
77 16*rows != s->avctx->coded_height) {
78 int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
79 if (ret < 0)
80 return ret;
81 return VP56_SIZE_CHANGE;
82 }
83 } else if (!s->macroblocks)
84 return AVERROR_INVALIDDATA;
85 return 0;
86 }
87
vp5_parse_vector_adjustment(VP56Context * s,VP56mv * vect)88 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
89 {
90 VP56RangeCoder *c = &s->c;
91 VP56Model *model = s->modelp;
92 int comp, di;
93
94 for (comp=0; comp<2; comp++) {
95 int delta = 0;
96 if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
97 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
98 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
99 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
100 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
101 model->vector_pdv[comp]);
102 delta = di | (delta << 2);
103 delta = (delta ^ -sign) + sign;
104 }
105 if (!comp)
106 vect->x = delta;
107 else
108 vect->y = delta;
109 }
110 }
111
vp5_parse_vector_models(VP56Context * s)112 static void vp5_parse_vector_models(VP56Context *s)
113 {
114 VP56RangeCoder *c = &s->c;
115 VP56Model *model = s->modelp;
116 int comp, node;
117
118 for (comp=0; comp<2; comp++) {
119 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
120 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
121 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
122 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
123 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
124 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
125 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
126 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
127 }
128
129 for (comp=0; comp<2; comp++)
130 for (node=0; node<7; node++)
131 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
132 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
133 }
134
vp5_parse_coeff_models(VP56Context * s)135 static int vp5_parse_coeff_models(VP56Context *s)
136 {
137 VP56RangeCoder *c = &s->c;
138 VP56Model *model = s->modelp;
139 uint8_t def_prob[11];
140 int node, cg, ctx;
141 int ct; /* code type */
142 int pt; /* plane type (0 for Y, 1 for U or V) */
143
144 memset(def_prob, 0x80, sizeof(def_prob));
145
146 for (pt=0; pt<2; pt++)
147 for (node=0; node<11; node++)
148 if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) {
149 def_prob[node] = vp56_rac_gets_nn(c, 7);
150 model->coeff_dccv[pt][node] = def_prob[node];
151 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
152 model->coeff_dccv[pt][node] = def_prob[node];
153 }
154
155 for (ct=0; ct<3; ct++)
156 for (pt=0; pt<2; pt++)
157 for (cg=0; cg<6; cg++)
158 for (node=0; node<11; node++)
159 if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
160 def_prob[node] = vp56_rac_gets_nn(c, 7);
161 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
162 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
163 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
164 }
165
166 /* coeff_dcct is a linear combination of coeff_dccv */
167 for (pt=0; pt<2; pt++)
168 for (ctx=0; ctx<36; ctx++)
169 for (node=0; node<5; node++)
170 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);
171
172 /* coeff_acct is a linear combination of coeff_ract */
173 for (ct=0; ct<3; ct++)
174 for (pt=0; pt<2; pt++)
175 for (cg=0; cg<3; cg++)
176 for (ctx=0; ctx<6; ctx++)
177 for (node=0; node<5; node++)
178 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);
179 return 0;
180 }
181
vp5_parse_coeff(VP56Context * s)182 static int vp5_parse_coeff(VP56Context *s)
183 {
184 VP56RangeCoder *c = &s->c;
185 VP56Model *model = s->modelp;
186 uint8_t *permute = s->idct_scantable;
187 uint8_t *model1, *model2;
188 int coeff, sign, coeff_idx;
189 int b, i, cg, idx, ctx, ctx_last;
190 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
191
192 if (vpX_rac_is_end(c)) {
193 av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
194 return AVERROR_INVALIDDATA;
195 }
196
197 for (b=0; b<6; b++) {
198 int ct = 1; /* code type */
199
200 if (b > 3) pt = 1;
201
202 ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
203 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
204 model1 = model->coeff_dccv[pt];
205 model2 = model->coeff_dcct[pt][ctx];
206
207 coeff_idx = 0;
208 for (;;) {
209 if (vp56_rac_get_prob_branchy(c, model2[0])) {
210 if (vp56_rac_get_prob_branchy(c, model2[2])) {
211 if (vp56_rac_get_prob_branchy(c, model2[3])) {
212 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
213 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
214 sign = vp56_rac_get(c);
215 coeff = ff_vp56_coeff_bias[idx+5];
216 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
217 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
218 } else {
219 if (vp56_rac_get_prob_branchy(c, model2[4])) {
220 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
221 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
222 } else {
223 coeff = 2;
224 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
225 }
226 sign = vp56_rac_get(c);
227 }
228 ct = 2;
229 } else {
230 ct = 1;
231 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
232 sign = vp56_rac_get(c);
233 coeff = 1;
234 }
235 coeff = (coeff ^ -sign) + sign;
236 if (coeff_idx)
237 coeff *= s->dequant_ac;
238 s->block_coeff[b][permute[coeff_idx]] = coeff;
239 } else {
240 if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
241 break;
242 ct = 0;
243 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
244 }
245 coeff_idx++;
246 if (coeff_idx >= 64)
247 break;
248
249 cg = vp5_coeff_groups[coeff_idx];
250 ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
251 model1 = model->coeff_ract[pt][ct][cg];
252 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
253 }
254
255 ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
256 s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
257 if (coeff_idx < ctx_last)
258 for (i=coeff_idx; i<=ctx_last; i++)
259 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
260 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
261 s->idct_selector[b] = 63;
262 }
263 return 0;
264 }
265
vp5_default_models_init(VP56Context * s)266 static void vp5_default_models_init(VP56Context *s)
267 {
268 VP56Model *model = s->modelp;
269 int i;
270
271 for (i=0; i<2; i++) {
272 model->vector_sig[i] = 0x80;
273 model->vector_dct[i] = 0x80;
274 model->vector_pdi[i][0] = 0x55;
275 model->vector_pdi[i][1] = 0x80;
276 }
277 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
278 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
279 }
280
vp5_decode_init(AVCodecContext * avctx)281 static av_cold int vp5_decode_init(AVCodecContext *avctx)
282 {
283 VP56Context *s = avctx->priv_data;
284 int ret;
285
286 if ((ret = ff_vp56_init_context(avctx, s, 1, 0)) < 0)
287 return ret;
288 ff_vp5dsp_init(&s->vp56dsp);
289 s->vp56_coord_div = vp5_coord_div;
290 s->parse_vector_adjustment = vp5_parse_vector_adjustment;
291 s->parse_coeff = vp5_parse_coeff;
292 s->default_models_init = vp5_default_models_init;
293 s->parse_vector_models = vp5_parse_vector_models;
294 s->parse_coeff_models = vp5_parse_coeff_models;
295 s->parse_header = vp5_parse_header;
296
297 return 0;
298 }
299
vp56_free(AVCodecContext * avctx)300 static av_cold int vp56_free(AVCodecContext *avctx)
301 {
302 VP56Context *const s = avctx->priv_data;
303 return ff_vp56_free_context(s);
304 }
305
306 const FFCodec ff_vp5_decoder = {
307 .p.name = "vp5",
308 .p.long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
309 .p.type = AVMEDIA_TYPE_VIDEO,
310 .p.id = AV_CODEC_ID_VP5,
311 .priv_data_size = sizeof(VP56Context),
312 .init = vp5_decode_init,
313 .close = vp56_free,
314 FF_CODEC_DECODE_CB(ff_vp56_decode_frame),
315 .p.capabilities = AV_CODEC_CAP_DR1,
316 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
317 };
318