| 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 "get_bits.h" |
| 31 | #include "internal.h" |
| 32 | |
| 33 | #include "vp56.h" |
| 34 | #include "vp56data.h" |
| 35 | #include "vp5data.h" |
| 36 | |
| 37 | |
| 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 | |
| 43 | ff_vp56_init_range_decoder(&s->c, buf, buf_size); |
| 44 | s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c); |
| 45 | vp56_rac_get(c); |
| 46 | ff_vp56_init_dequant(s, vp56_rac_gets(c, 6)); |
| 47 | if (s->frames[VP56_FRAME_CURRENT]->key_frame) |
| 48 | { |
| 49 | vp56_rac_gets(c, 8); |
| 50 | if(vp56_rac_gets(c, 5) > 5) |
| 51 | return AVERROR_INVALIDDATA; |
| 52 | vp56_rac_gets(c, 2); |
| 53 | if (vp56_rac_get(c)) { |
| 54 | av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n"); |
| 55 | return AVERROR_PATCHWELCOME; |
| 56 | } |
| 57 | rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */ |
| 58 | cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */ |
| 59 | if (!rows || !cols) { |
| 60 | av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", |
| 61 | cols << 4, rows << 4); |
| 62 | return AVERROR_INVALIDDATA; |
| 63 | } |
| 64 | vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ |
| 65 | vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ |
| 66 | vp56_rac_gets(c, 2); |
| 67 | if (!s->macroblocks || /* first frame */ |
| 68 | 16*cols != s->avctx->coded_width || |
| 69 | 16*rows != s->avctx->coded_height) { |
| 70 | int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows); |
| 71 | if (ret < 0) |
| 72 | return ret; |
| 73 | return VP56_SIZE_CHANGE; |
| 74 | } |
| 75 | } else if (!s->macroblocks) |
| 76 | return AVERROR_INVALIDDATA; |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect) |
| 81 | { |
| 82 | VP56RangeCoder *c = &s->c; |
| 83 | VP56Model *model = s->modelp; |
| 84 | int comp, di; |
| 85 | |
| 86 | for (comp=0; comp<2; comp++) { |
| 87 | int delta = 0; |
| 88 | if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) { |
| 89 | int sign = vp56_rac_get_prob(c, model->vector_sig[comp]); |
| 90 | di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]); |
| 91 | di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1; |
| 92 | delta = vp56_rac_get_tree(c, ff_vp56_pva_tree, |
| 93 | model->vector_pdv[comp]); |
| 94 | delta = di | (delta << 2); |
| 95 | delta = (delta ^ -sign) + sign; |
| 96 | } |
| 97 | if (!comp) |
| 98 | vect->x = delta; |
| 99 | else |
| 100 | vect->y = delta; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | static void vp5_parse_vector_models(VP56Context *s) |
| 105 | { |
| 106 | VP56RangeCoder *c = &s->c; |
| 107 | VP56Model *model = s->modelp; |
| 108 | int comp, node; |
| 109 | |
| 110 | for (comp=0; comp<2; comp++) { |
| 111 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0])) |
| 112 | model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); |
| 113 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1])) |
| 114 | model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); |
| 115 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2])) |
| 116 | model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7); |
| 117 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3])) |
| 118 | model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7); |
| 119 | } |
| 120 | |
| 121 | for (comp=0; comp<2; comp++) |
| 122 | for (node=0; node<7; node++) |
| 123 | if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node])) |
| 124 | model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); |
| 125 | } |
| 126 | |
| 127 | static int vp5_parse_coeff_models(VP56Context *s) |
| 128 | { |
| 129 | VP56RangeCoder *c = &s->c; |
| 130 | VP56Model *model = s->modelp; |
| 131 | uint8_t def_prob[11]; |
| 132 | int node, cg, ctx; |
| 133 | int ct; /* code type */ |
| 134 | int pt; /* plane type (0 for Y, 1 for U or V) */ |
| 135 | |
| 136 | memset(def_prob, 0x80, sizeof(def_prob)); |
| 137 | |
| 138 | for (pt=0; pt<2; pt++) |
| 139 | for (node=0; node<11; node++) |
| 140 | if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) { |
| 141 | def_prob[node] = vp56_rac_gets_nn(c, 7); |
| 142 | model->coeff_dccv[pt][node] = def_prob[node]; |
| 143 | } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { |
| 144 | model->coeff_dccv[pt][node] = def_prob[node]; |
| 145 | } |
| 146 | |
| 147 | for (ct=0; ct<3; ct++) |
| 148 | for (pt=0; pt<2; pt++) |
| 149 | for (cg=0; cg<6; cg++) |
| 150 | for (node=0; node<11; node++) |
| 151 | if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) { |
| 152 | def_prob[node] = vp56_rac_gets_nn(c, 7); |
| 153 | model->coeff_ract[pt][ct][cg][node] = def_prob[node]; |
| 154 | } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { |
| 155 | model->coeff_ract[pt][ct][cg][node] = def_prob[node]; |
| 156 | } |
| 157 | |
| 158 | /* coeff_dcct is a linear combination of coeff_dccv */ |
| 159 | for (pt=0; pt<2; pt++) |
| 160 | for (ctx=0; ctx<36; ctx++) |
| 161 | for (node=0; node<5; node++) |
| 162 | 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 | |
| 164 | /* coeff_acct is a linear combination of coeff_ract */ |
| 165 | for (ct=0; ct<3; ct++) |
| 166 | for (pt=0; pt<2; pt++) |
| 167 | for (cg=0; cg<3; cg++) |
| 168 | for (ctx=0; ctx<6; ctx++) |
| 169 | for (node=0; node<5; node++) |
| 170 | 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 | return 0; |
| 172 | } |
| 173 | |
| 174 | static void vp5_parse_coeff(VP56Context *s) |
| 175 | { |
| 176 | VP56RangeCoder *c = &s->c; |
| 177 | VP56Model *model = s->modelp; |
| 178 | uint8_t *permute = s->idct_scantable; |
| 179 | uint8_t *model1, *model2; |
| 180 | int coeff, sign, coeff_idx; |
| 181 | int b, i, cg, idx, ctx, ctx_last; |
| 182 | int pt = 0; /* plane type (0 for Y, 1 for U or V) */ |
| 183 | |
| 184 | for (b=0; b<6; b++) { |
| 185 | int ct = 1; /* code type */ |
| 186 | |
| 187 | if (b > 3) pt = 1; |
| 188 | |
| 189 | ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] |
| 190 | + s->above_blocks[s->above_block_idx[b]].not_null_dc; |
| 191 | model1 = model->coeff_dccv[pt]; |
| 192 | model2 = model->coeff_dcct[pt][ctx]; |
| 193 | |
| 194 | coeff_idx = 0; |
| 195 | for (;;) { |
| 196 | if (vp56_rac_get_prob_branchy(c, model2[0])) { |
| 197 | if (vp56_rac_get_prob_branchy(c, model2[2])) { |
| 198 | if (vp56_rac_get_prob_branchy(c, model2[3])) { |
| 199 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; |
| 200 | idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); |
| 201 | sign = vp56_rac_get(c); |
| 202 | coeff = ff_vp56_coeff_bias[idx+5]; |
| 203 | for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) |
| 204 | coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; |
| 205 | } else { |
| 206 | if (vp56_rac_get_prob_branchy(c, model2[4])) { |
| 207 | coeff = 3 + vp56_rac_get_prob(c, model1[5]); |
| 208 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; |
| 209 | } else { |
| 210 | coeff = 2; |
| 211 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; |
| 212 | } |
| 213 | sign = vp56_rac_get(c); |
| 214 | } |
| 215 | ct = 2; |
| 216 | } else { |
| 217 | ct = 1; |
| 218 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; |
| 219 | sign = vp56_rac_get(c); |
| 220 | coeff = 1; |
| 221 | } |
| 222 | coeff = (coeff ^ -sign) + sign; |
| 223 | if (coeff_idx) |
| 224 | coeff *= s->dequant_ac; |
| 225 | s->block_coeff[b][permute[coeff_idx]] = coeff; |
| 226 | } else { |
| 227 | if (ct && !vp56_rac_get_prob_branchy(c, model2[1])) |
| 228 | break; |
| 229 | ct = 0; |
| 230 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; |
| 231 | } |
| 232 | coeff_idx++; |
| 233 | if (coeff_idx >= 64) |
| 234 | break; |
| 235 | |
| 236 | cg = vp5_coeff_groups[coeff_idx]; |
| 237 | ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; |
| 238 | model1 = model->coeff_ract[pt][ct][cg]; |
| 239 | model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; |
| 240 | } |
| 241 | |
| 242 | ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); |
| 243 | s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; |
| 244 | if (coeff_idx < ctx_last) |
| 245 | for (i=coeff_idx; i<=ctx_last; i++) |
| 246 | s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; |
| 247 | s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | static void vp5_default_models_init(VP56Context *s) |
| 252 | { |
| 253 | VP56Model *model = s->modelp; |
| 254 | int i; |
| 255 | |
| 256 | for (i=0; i<2; i++) { |
| 257 | model->vector_sig[i] = 0x80; |
| 258 | model->vector_dct[i] = 0x80; |
| 259 | model->vector_pdi[i][0] = 0x55; |
| 260 | model->vector_pdi[i][1] = 0x80; |
| 261 | } |
| 262 | memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); |
| 263 | memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv)); |
| 264 | } |
| 265 | |
| 266 | static av_cold int vp5_decode_init(AVCodecContext *avctx) |
| 267 | { |
| 268 | VP56Context *s = avctx->priv_data; |
| 269 | int ret; |
| 270 | |
| 271 | if ((ret = ff_vp56_init(avctx, 1, 0)) < 0) |
| 272 | return ret; |
| 273 | s->vp56_coord_div = vp5_coord_div; |
| 274 | s->parse_vector_adjustment = vp5_parse_vector_adjustment; |
| 275 | s->parse_coeff = vp5_parse_coeff; |
| 276 | s->default_models_init = vp5_default_models_init; |
| 277 | s->parse_vector_models = vp5_parse_vector_models; |
| 278 | s->parse_coeff_models = vp5_parse_coeff_models; |
| 279 | s->parse_header = vp5_parse_header; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | AVCodec ff_vp5_decoder = { |
| 285 | .name = "vp5", |
| 286 | .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"), |
| 287 | .type = AVMEDIA_TYPE_VIDEO, |
| 288 | .id = AV_CODEC_ID_VP5, |
| 289 | .priv_data_size = sizeof(VP56Context), |
| 290 | .init = vp5_decode_init, |
| 291 | .close = ff_vp56_free, |
| 292 | .decode = ff_vp56_decode_frame, |
| 293 | .capabilities = CODEC_CAP_DR1, |
| 294 | }; |