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
37 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->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
45 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
46 if (s->frames[VP56_FRAME_CURRENT]->key_frame)
49 if(vp56_rac_gets(c, 5) > 5)
50 return AVERROR_INVALIDDATA;
52 if (vp56_rac_get(c)) {
53 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
54 return AVERROR_PATCHWELCOME;
56 rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
57 cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
59 av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
60 cols << 4, rows << 4);
61 return AVERROR_INVALIDDATA;
63 vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
64 vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
66 if (!s->macroblocks || /* first frame */
67 16*cols != s->avctx->coded_width ||
68 16*rows != s->avctx->coded_height) {
69 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
70 return VP56_SIZE_CHANGE;
72 } else if (!s->macroblocks)
73 return AVERROR_INVALIDDATA;
77 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
79 VP56RangeCoder *c = &s->c;
80 VP56Model *model = s->modelp;
83 for (comp=0; comp<2; comp++) {
85 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
86 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
87 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
88 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
89 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
90 model->vector_pdv[comp]);
91 delta = di | (delta << 2);
92 delta = (delta ^ -sign) + sign;
101 static void vp5_parse_vector_models(VP56Context *s)
103 VP56RangeCoder *c = &s->c;
104 VP56Model *model = s->modelp;
107 for (comp=0; comp<2; comp++) {
108 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
109 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
110 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
111 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
112 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
113 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
114 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
115 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
118 for (comp=0; comp<2; comp++)
119 for (node=0; node<7; node++)
120 if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
121 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
124 static int vp5_parse_coeff_models(VP56Context *s)
126 VP56RangeCoder *c = &s->c;
127 VP56Model *model = s->modelp;
128 uint8_t def_prob[11];
130 int ct; /* code type */
131 int pt; /* plane type (0 for Y, 1 for U or V) */
133 memset(def_prob, 0x80, sizeof(def_prob));
135 for (pt=0; pt<2; pt++)
136 for (node=0; node<11; node++)
137 if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
138 def_prob[node] = vp56_rac_gets_nn(c, 7);
139 model->coeff_dccv[pt][node] = def_prob[node];
140 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
141 model->coeff_dccv[pt][node] = def_prob[node];
144 for (ct=0; ct<3; ct++)
145 for (pt=0; pt<2; pt++)
146 for (cg=0; cg<6; cg++)
147 for (node=0; node<11; node++)
148 if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
149 def_prob[node] = vp56_rac_gets_nn(c, 7);
150 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
151 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
152 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
155 /* coeff_dcct is a linear combination of coeff_dccv */
156 for (pt=0; pt<2; pt++)
157 for (ctx=0; ctx<36; ctx++)
158 for (node=0; node<5; node++)
159 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);
161 /* coeff_acct is a linear combination of coeff_ract */
162 for (ct=0; ct<3; ct++)
163 for (pt=0; pt<2; pt++)
164 for (cg=0; cg<3; cg++)
165 for (ctx=0; ctx<6; ctx++)
166 for (node=0; node<5; node++)
167 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);
171 static void vp5_parse_coeff(VP56Context *s)
173 VP56RangeCoder *c = &s->c;
174 VP56Model *model = s->modelp;
175 uint8_t *permute = s->idct_scantable;
176 uint8_t *model1, *model2;
177 int coeff, sign, coeff_idx;
178 int b, i, cg, idx, ctx, ctx_last;
179 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
181 for (b=0; b<6; b++) {
182 int ct = 1; /* code type */
186 ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
187 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
188 model1 = model->coeff_dccv[pt];
189 model2 = model->coeff_dcct[pt][ctx];
193 if (vp56_rac_get_prob(c, model2[0])) {
194 if (vp56_rac_get_prob(c, model2[2])) {
195 if (vp56_rac_get_prob(c, model2[3])) {
196 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
197 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
198 sign = vp56_rac_get(c);
199 coeff = ff_vp56_coeff_bias[idx+5];
200 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
201 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
203 if (vp56_rac_get_prob(c, model2[4])) {
204 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
205 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
208 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
210 sign = vp56_rac_get(c);
215 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
216 sign = vp56_rac_get(c);
219 coeff = (coeff ^ -sign) + sign;
221 coeff *= s->dequant_ac;
222 s->block_coeff[b][permute[coeff_idx]] = coeff;
224 if (ct && !vp56_rac_get_prob(c, model2[1]))
227 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
233 cg = vp5_coeff_groups[coeff_idx];
234 ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
235 model1 = model->coeff_ract[pt][ct][cg];
236 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
239 ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
240 s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
241 if (coeff_idx < ctx_last)
242 for (i=coeff_idx; i<=ctx_last; i++)
243 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
244 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
248 static void vp5_default_models_init(VP56Context *s)
250 VP56Model *model = s->modelp;
253 for (i=0; i<2; i++) {
254 model->vector_sig[i] = 0x80;
255 model->vector_dct[i] = 0x80;
256 model->vector_pdi[i][0] = 0x55;
257 model->vector_pdi[i][1] = 0x80;
259 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
260 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
263 static av_cold int vp5_decode_init(AVCodecContext *avctx)
265 VP56Context *s = avctx->priv_data;
268 if ((ret = ff_vp56_init(avctx, 1, 0)) < 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,
284 .id = AV_CODEC_ID_VP5,
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"),