3 * VP5 compatible video decoder
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
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.
14 * FFmpeg is distributed in the hope that it will be useful,
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.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
36 static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
39 VP56RangeCoder *c = &s->c;
42 ff_vp56_init_range_decoder(&s->c, buf, buf_size);
43 s->framep[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
45 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
46 if (s->framep[VP56_FRAME_CURRENT]->key_frame)
49 if(vp56_rac_gets(c, 5) > 5)
52 if (vp56_rac_get(c)) {
53 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
56 rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
57 cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
58 vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
59 vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
61 if (!s->macroblocks || /* first frame */
62 16*cols != s->avctx->coded_width ||
63 16*rows != s->avctx->coded_height) {
64 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
67 } else if (!s->macroblocks)
72 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
74 VP56RangeCoder *c = &s->c;
75 VP56Model *model = s->modelp;
78 for (comp=0; comp<2; comp++) {
80 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
81 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
82 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
83 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
84 delta = vp56_rac_get_tree(c, vp56_pva_tree,
85 model->vector_pdv[comp]);
86 delta = di | (delta << 2);
87 delta = (delta ^ -sign) + sign;
96 static void vp5_parse_vector_models(VP56Context *s)
98 VP56RangeCoder *c = &s->c;
99 VP56Model *model = s->modelp;
102 for (comp=0; comp<2; comp++) {
103 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
104 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
105 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
106 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
107 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
108 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
109 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
110 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
113 for (comp=0; comp<2; comp++)
114 for (node=0; node<7; node++)
115 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
116 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
119 static void vp5_parse_coeff_models(VP56Context *s)
121 VP56RangeCoder *c = &s->c;
122 VP56Model *model = s->modelp;
123 uint8_t def_prob[11];
125 int ct; /* code type */
126 int pt; /* plane type (0 for Y, 1 for U or V) */
128 memset(def_prob, 0x80, sizeof(def_prob));
130 for (pt=0; pt<2; pt++)
131 for (node=0; node<11; node++)
132 if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
133 def_prob[node] = vp56_rac_gets_nn(c, 7);
134 model->coeff_dccv[pt][node] = def_prob[node];
135 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
136 model->coeff_dccv[pt][node] = def_prob[node];
139 for (ct=0; ct<3; ct++)
140 for (pt=0; pt<2; pt++)
141 for (cg=0; cg<6; cg++)
142 for (node=0; node<11; node++)
143 if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
144 def_prob[node] = vp56_rac_gets_nn(c, 7);
145 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
146 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
147 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
150 /* coeff_dcct is a linear combination of coeff_dccv */
151 for (pt=0; pt<2; pt++)
152 for (ctx=0; ctx<36; ctx++)
153 for (node=0; node<5; node++)
154 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);
156 /* coeff_acct is a linear combination of coeff_ract */
157 for (ct=0; ct<3; ct++)
158 for (pt=0; pt<2; pt++)
159 for (cg=0; cg<3; cg++)
160 for (ctx=0; ctx<6; ctx++)
161 for (node=0; node<5; node++)
162 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);
165 static void vp5_parse_coeff(VP56Context *s)
167 VP56RangeCoder *c = &s->c;
168 VP56Model *model = s->modelp;
169 uint8_t *permute = s->scantable.permutated;
170 uint8_t *model1, *model2;
171 int coeff, sign, coeff_idx;
172 int b, i, cg, idx, ctx, ctx_last;
173 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
175 for (b=0; b<6; b++) {
176 int ct = 1; /* code type */
180 ctx = 6*s->coeff_ctx[vp56_b6to4[b]][0]
181 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
182 model1 = model->coeff_dccv[pt];
183 model2 = model->coeff_dcct[pt][ctx];
185 for (coeff_idx=0; coeff_idx<64; ) {
186 if (vp56_rac_get_prob(c, model2[0])) {
187 if (vp56_rac_get_prob(c, model2[2])) {
188 if (vp56_rac_get_prob(c, model2[3])) {
189 s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4;
190 idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
191 sign = vp56_rac_get(c);
192 coeff = vp56_coeff_bias[idx+5];
193 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
194 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
196 if (vp56_rac_get_prob(c, model2[4])) {
197 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
198 s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 3;
201 s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 2;
203 sign = vp56_rac_get(c);
208 s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 1;
209 sign = vp56_rac_get(c);
212 coeff = (coeff ^ -sign) + sign;
214 coeff *= s->dequant_ac;
215 s->block_coeff[b][permute[coeff_idx]] = coeff;
217 if (ct && !vp56_rac_get_prob(c, model2[1]))
220 s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 0;
223 cg = vp5_coeff_groups[++coeff_idx];
224 ctx = s->coeff_ctx[vp56_b6to4[b]][coeff_idx];
225 model1 = model->coeff_ract[pt][ct][cg];
226 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
229 ctx_last = FFMIN(s->coeff_ctx_last[vp56_b6to4[b]], 24);
230 s->coeff_ctx_last[vp56_b6to4[b]] = coeff_idx;
231 if (coeff_idx < ctx_last)
232 for (i=coeff_idx; i<=ctx_last; i++)
233 s->coeff_ctx[vp56_b6to4[b]][i] = 5;
234 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[vp56_b6to4[b]][0];
238 static void vp5_default_models_init(VP56Context *s)
240 VP56Model *model = s->modelp;
243 for (i=0; i<2; i++) {
244 model->vector_sig[i] = 0x80;
245 model->vector_dct[i] = 0x80;
246 model->vector_pdi[i][0] = 0x55;
247 model->vector_pdi[i][1] = 0x80;
249 memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
250 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
253 static av_cold int vp5_decode_init(AVCodecContext *avctx)
255 VP56Context *s = avctx->priv_data;
257 ff_vp56_init(avctx, 1, 0);
258 s->vp56_coord_div = vp5_coord_div;
259 s->parse_vector_adjustment = vp5_parse_vector_adjustment;
260 s->parse_coeff = vp5_parse_coeff;
261 s->default_models_init = vp5_default_models_init;
262 s->parse_vector_models = vp5_parse_vector_models;
263 s->parse_coeff_models = vp5_parse_coeff_models;
264 s->parse_header = vp5_parse_header;
269 AVCodec vp5_decoder = {
277 ff_vp56_decode_frame,
279 .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),