2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * VP5 compatible video decoder
38 static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
41 VP56RangeCoder *c = &s->c;
44 ff_vp56_init_range_decoder(&s->c, buf, buf_size);
45 s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
47 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
48 if (s->frames[VP56_FRAME_CURRENT]->key_frame)
51 if(vp56_rac_gets(c, 5) > 5)
52 return AVERROR_INVALIDDATA;
54 if (vp56_rac_get(c)) {
55 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
56 return AVERROR_PATCHWELCOME;
58 rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
59 cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
61 av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
62 cols << 4, rows << 4);
63 return AVERROR_INVALIDDATA;
65 vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
66 vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
68 if (!s->macroblocks || /* first frame */
69 16*cols != s->avctx->coded_width ||
70 16*rows != s->avctx->coded_height) {
71 int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
74 return VP56_SIZE_CHANGE;
76 } else if (!s->macroblocks)
77 return AVERROR_INVALIDDATA;
81 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
83 VP56RangeCoder *c = &s->c;
84 VP56Model *model = s->modelp;
87 for (comp=0; comp<2; comp++) {
89 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
90 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
91 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
92 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
93 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
94 model->vector_pdv[comp]);
95 delta = di | (delta << 2);
96 delta = (delta ^ -sign) + sign;
105 static void vp5_parse_vector_models(VP56Context *s)
107 VP56RangeCoder *c = &s->c;
108 VP56Model *model = s->modelp;
111 for (comp=0; comp<2; comp++) {
112 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
113 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
114 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
115 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
116 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
117 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
118 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
119 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
122 for (comp=0; comp<2; comp++)
123 for (node=0; node<7; node++)
124 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
125 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
128 static int vp5_parse_coeff_models(VP56Context *s)
130 VP56RangeCoder *c = &s->c;
131 VP56Model *model = s->modelp;
132 uint8_t def_prob[11];
134 int ct; /* code type */
135 int pt; /* plane type (0 for Y, 1 for U or V) */
137 memset(def_prob, 0x80, sizeof(def_prob));
139 for (pt=0; pt<2; pt++)
140 for (node=0; node<11; node++)
141 if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
142 def_prob[node] = vp56_rac_gets_nn(c, 7);
143 model->coeff_dccv[pt][node] = def_prob[node];
144 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
145 model->coeff_dccv[pt][node] = def_prob[node];
148 for (ct=0; ct<3; ct++)
149 for (pt=0; pt<2; pt++)
150 for (cg=0; cg<6; cg++)
151 for (node=0; node<11; node++)
152 if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
153 def_prob[node] = vp56_rac_gets_nn(c, 7);
154 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
155 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
156 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
159 /* coeff_dcct is a linear combination of coeff_dccv */
160 for (pt=0; pt<2; pt++)
161 for (ctx=0; ctx<36; ctx++)
162 for (node=0; node<5; node++)
163 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);
165 /* coeff_acct is a linear combination of coeff_ract */
166 for (ct=0; ct<3; ct++)
167 for (pt=0; pt<2; pt++)
168 for (cg=0; cg<3; cg++)
169 for (ctx=0; ctx<6; ctx++)
170 for (node=0; node<5; node++)
171 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);
175 static void vp5_parse_coeff(VP56Context *s)
177 VP56RangeCoder *c = &s->c;
178 VP56Model *model = s->modelp;
179 uint8_t *permute = s->idct_scantable;
180 uint8_t *model1, *model2;
181 int coeff, sign, coeff_idx;
182 int b, i, cg, idx, ctx, ctx_last;
183 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
185 for (b=0; b<6; b++) {
186 int ct = 1; /* code type */
190 ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
191 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
192 model1 = model->coeff_dccv[pt];
193 model2 = model->coeff_dcct[pt][ctx];
197 if (vp56_rac_get_prob(c, model2[0])) {
198 if (vp56_rac_get_prob(c, model2[2])) {
199 if (vp56_rac_get_prob(c, model2[3])) {
200 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
201 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
202 sign = vp56_rac_get(c);
203 coeff = ff_vp56_coeff_bias[idx+5];
204 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
205 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
207 if (vp56_rac_get_prob(c, model2[4])) {
208 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
209 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
212 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
214 sign = vp56_rac_get(c);
219 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
220 sign = vp56_rac_get(c);
223 coeff = (coeff ^ -sign) + sign;
225 coeff *= s->dequant_ac;
226 s->block_coeff[b][permute[coeff_idx]] = coeff;
228 if (ct && !vp56_rac_get_prob(c, model2[1]))
231 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
237 cg = vp5_coeff_groups[coeff_idx];
238 ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
239 model1 = model->coeff_ract[pt][ct][cg];
240 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
243 ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
244 s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
245 if (coeff_idx < ctx_last)
246 for (i=coeff_idx; i<=ctx_last; i++)
247 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
248 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
252 static void vp5_default_models_init(VP56Context *s)
254 VP56Model *model = s->modelp;
257 for (i=0; i<2; i++) {
258 model->vector_sig[i] = 0x80;
259 model->vector_dct[i] = 0x80;
260 model->vector_pdi[i][0] = 0x55;
261 model->vector_pdi[i][1] = 0x80;
263 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
264 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
267 static av_cold int vp5_decode_init(AVCodecContext *avctx)
269 VP56Context *s = avctx->priv_data;
272 if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
274 s->vp56_coord_div = vp5_coord_div;
275 s->parse_vector_adjustment = vp5_parse_vector_adjustment;
276 s->parse_coeff = vp5_parse_coeff;
277 s->default_models_init = vp5_default_models_init;
278 s->parse_vector_models = vp5_parse_vector_models;
279 s->parse_coeff_models = vp5_parse_coeff_models;
280 s->parse_header = vp5_parse_header;
285 AVCodec ff_vp5_decoder = {
287 .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
288 .type = AVMEDIA_TYPE_VIDEO,
289 .id = AV_CODEC_ID_VP5,
290 .priv_data_size = sizeof(VP56Context),
291 .init = vp5_decode_init,
292 .close = ff_vp56_free,
293 .decode = ff_vp56_decode_frame,
294 .capabilities = AV_CODEC_CAP_DR1,