2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 * This file is part of FFmpeg.
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.
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.
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
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->framep[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
47 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
48 if (s->framep[VP56_FRAME_CURRENT]->key_frame)
51 if(vp56_rac_gets(c, 5) > 5)
54 if (vp56_rac_get(c)) {
55 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
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);
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 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
74 } else if (!s->macroblocks)
79 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
81 VP56RangeCoder *c = &s->c;
82 VP56Model *model = s->modelp;
85 for (comp=0; comp<2; comp++) {
87 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
88 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
89 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
90 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
91 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
92 model->vector_pdv[comp]);
93 delta = di | (delta << 2);
94 delta = (delta ^ -sign) + sign;
103 static void vp5_parse_vector_models(VP56Context *s)
105 VP56RangeCoder *c = &s->c;
106 VP56Model *model = s->modelp;
109 for (comp=0; comp<2; comp++) {
110 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
111 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
112 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
113 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
114 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
115 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
116 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
117 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
120 for (comp=0; comp<2; comp++)
121 for (node=0; node<7; node++)
122 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
123 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
126 static int vp5_parse_coeff_models(VP56Context *s)
128 VP56RangeCoder *c = &s->c;
129 VP56Model *model = s->modelp;
130 uint8_t def_prob[11];
132 int ct; /* code type */
133 int pt; /* plane type (0 for Y, 1 for U or V) */
135 memset(def_prob, 0x80, sizeof(def_prob));
137 for (pt=0; pt<2; pt++)
138 for (node=0; node<11; node++)
139 if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
140 def_prob[node] = vp56_rac_gets_nn(c, 7);
141 model->coeff_dccv[pt][node] = def_prob[node];
142 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
143 model->coeff_dccv[pt][node] = def_prob[node];
146 for (ct=0; ct<3; ct++)
147 for (pt=0; pt<2; pt++)
148 for (cg=0; cg<6; cg++)
149 for (node=0; node<11; node++)
150 if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
151 def_prob[node] = vp56_rac_gets_nn(c, 7);
152 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
153 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
154 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
157 /* coeff_dcct is a linear combination of coeff_dccv */
158 for (pt=0; pt<2; pt++)
159 for (ctx=0; ctx<36; ctx++)
160 for (node=0; node<5; node++)
161 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 /* coeff_acct is a linear combination of coeff_ract */
164 for (ct=0; ct<3; ct++)
165 for (pt=0; pt<2; pt++)
166 for (cg=0; cg<3; cg++)
167 for (ctx=0; ctx<6; ctx++)
168 for (node=0; node<5; node++)
169 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);
173 static void vp5_parse_coeff(VP56Context *s)
175 VP56RangeCoder *c = &s->c;
176 VP56Model *model = s->modelp;
177 uint8_t *permute = s->scantable.permutated;
178 uint8_t *model1, *model2;
179 int coeff, sign, coeff_idx;
180 int b, i, cg, idx, ctx, ctx_last;
181 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
183 for (b=0; b<6; b++) {
184 int ct = 1; /* code type */
188 ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
189 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
190 model1 = model->coeff_dccv[pt];
191 model2 = model->coeff_dcct[pt][ctx];
195 if (vp56_rac_get_prob(c, model2[0])) {
196 if (vp56_rac_get_prob(c, model2[2])) {
197 if (vp56_rac_get_prob(c, model2[3])) {
198 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
199 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
200 sign = vp56_rac_get(c);
201 coeff = ff_vp56_coeff_bias[idx+5];
202 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
203 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
205 if (vp56_rac_get_prob(c, model2[4])) {
206 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
207 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
210 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
212 sign = vp56_rac_get(c);
217 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
218 sign = vp56_rac_get(c);
221 coeff = (coeff ^ -sign) + sign;
223 coeff *= s->dequant_ac;
224 s->block_coeff[b][permute[coeff_idx]] = coeff;
226 if (ct && !vp56_rac_get_prob(c, model2[1]))
229 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
235 cg = vp5_coeff_groups[coeff_idx];
236 ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
237 model1 = model->coeff_ract[pt][ct][cg];
238 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
241 ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
242 s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
243 if (coeff_idx < ctx_last)
244 for (i=coeff_idx; i<=ctx_last; i++)
245 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
246 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
250 static void vp5_default_models_init(VP56Context *s)
252 VP56Model *model = s->modelp;
255 for (i=0; i<2; i++) {
256 model->vector_sig[i] = 0x80;
257 model->vector_dct[i] = 0x80;
258 model->vector_pdi[i][0] = 0x55;
259 model->vector_pdi[i][1] = 0x80;
261 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
262 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
265 static av_cold int vp5_decode_init(AVCodecContext *avctx)
267 VP56Context *s = avctx->priv_data;
269 ff_vp56_init(avctx, 1, 0);
270 s->vp56_coord_div = vp5_coord_div;
271 s->parse_vector_adjustment = vp5_parse_vector_adjustment;
272 s->parse_coeff = vp5_parse_coeff;
273 s->default_models_init = vp5_default_models_init;
274 s->parse_vector_models = vp5_parse_vector_models;
275 s->parse_coeff_models = vp5_parse_coeff_models;
276 s->parse_header = vp5_parse_header;
281 AVCodec ff_vp5_decoder = {
283 .type = AVMEDIA_TYPE_VIDEO,
285 .priv_data_size = sizeof(VP56Context),
286 .init = vp5_decode_init,
287 .close = ff_vp56_free,
288 .decode = ff_vp56_decode_frame,
289 .capabilities = CODEC_CAP_DR1,
290 .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),