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 "codec_internal.h" 31#include "internal.h" 32 33#include "vp56.h" 34#include "vp56data.h" 35#include "vp5data.h" 36 37 38static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) 39{ 40 VP56RangeCoder *c = &s->c; 41 int rows, cols; 42 int ret; 43 44 ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size); 45 if (ret < 0) 46 return ret; 47 s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c); 48 vp56_rac_get(c); 49 ff_vp56_init_dequant(s, vp56_rac_gets(c, 6)); 50 if (s->frames[VP56_FRAME_CURRENT]->key_frame) 51 { 52 int render_x, render_y; 53 54 vp56_rac_gets(c, 8); 55 if(vp56_rac_gets(c, 5) > 5) 56 return AVERROR_INVALIDDATA; 57 vp56_rac_gets(c, 2); 58 if (vp56_rac_get(c)) { 59 avpriv_report_missing_feature(s->avctx, "Interlacing"); 60 return AVERROR_PATCHWELCOME; 61 } 62 rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */ 63 cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */ 64 if (!rows || !cols) { 65 av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", 66 cols << 4, rows << 4); 67 return AVERROR_INVALIDDATA; 68 } 69 render_y = vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ 70 render_x = vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ 71 if (render_x == 0 || render_x > cols || 72 render_y == 0 || render_y > rows) 73 return AVERROR_INVALIDDATA; 74 vp56_rac_gets(c, 2); 75 if (!s->macroblocks || /* first frame */ 76 16*cols != s->avctx->coded_width || 77 16*rows != s->avctx->coded_height) { 78 int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows); 79 if (ret < 0) 80 return ret; 81 return VP56_SIZE_CHANGE; 82 } 83 } else if (!s->macroblocks) 84 return AVERROR_INVALIDDATA; 85 return 0; 86} 87 88static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect) 89{ 90 VP56RangeCoder *c = &s->c; 91 VP56Model *model = s->modelp; 92 int comp, di; 93 94 for (comp=0; comp<2; comp++) { 95 int delta = 0; 96 if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) { 97 int sign = vp56_rac_get_prob(c, model->vector_sig[comp]); 98 di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]); 99 di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1; 100 delta = vp56_rac_get_tree(c, ff_vp56_pva_tree, 101 model->vector_pdv[comp]); 102 delta = di | (delta << 2); 103 delta = (delta ^ -sign) + sign; 104 } 105 if (!comp) 106 vect->x = delta; 107 else 108 vect->y = delta; 109 } 110} 111 112static void vp5_parse_vector_models(VP56Context *s) 113{ 114 VP56RangeCoder *c = &s->c; 115 VP56Model *model = s->modelp; 116 int comp, node; 117 118 for (comp=0; comp<2; comp++) { 119 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0])) 120 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); 121 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1])) 122 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); 123 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2])) 124 model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7); 125 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3])) 126 model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7); 127 } 128 129 for (comp=0; comp<2; comp++) 130 for (node=0; node<7; node++) 131 if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node])) 132 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); 133} 134 135static int vp5_parse_coeff_models(VP56Context *s) 136{ 137 VP56RangeCoder *c = &s->c; 138 VP56Model *model = s->modelp; 139 uint8_t def_prob[11]; 140 int node, cg, ctx; 141 int ct; /* code type */ 142 int pt; /* plane type (0 for Y, 1 for U or V) */ 143 144 memset(def_prob, 0x80, sizeof(def_prob)); 145 146 for (pt=0; pt<2; pt++) 147 for (node=0; node<11; node++) 148 if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) { 149 def_prob[node] = vp56_rac_gets_nn(c, 7); 150 model->coeff_dccv[pt][node] = def_prob[node]; 151 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { 152 model->coeff_dccv[pt][node] = def_prob[node]; 153 } 154 155 for (ct=0; ct<3; ct++) 156 for (pt=0; pt<2; pt++) 157 for (cg=0; cg<6; cg++) 158 for (node=0; node<11; node++) 159 if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) { 160 def_prob[node] = vp56_rac_gets_nn(c, 7); 161 model->coeff_ract[pt][ct][cg][node] = def_prob[node]; 162 } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { 163 model->coeff_ract[pt][ct][cg][node] = def_prob[node]; 164 } 165 166 /* coeff_dcct is a linear combination of coeff_dccv */ 167 for (pt=0; pt<2; pt++) 168 for (ctx=0; ctx<36; ctx++) 169 for (node=0; node<5; node++) 170 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); 171 172 /* coeff_acct is a linear combination of coeff_ract */ 173 for (ct=0; ct<3; ct++) 174 for (pt=0; pt<2; pt++) 175 for (cg=0; cg<3; cg++) 176 for (ctx=0; ctx<6; ctx++) 177 for (node=0; node<5; node++) 178 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); 179 return 0; 180} 181 182static int vp5_parse_coeff(VP56Context *s) 183{ 184 VP56RangeCoder *c = &s->c; 185 VP56Model *model = s->modelp; 186 uint8_t *permute = s->idct_scantable; 187 uint8_t *model1, *model2; 188 int coeff, sign, coeff_idx; 189 int b, i, cg, idx, ctx, ctx_last; 190 int pt = 0; /* plane type (0 for Y, 1 for U or V) */ 191 192 if (vpX_rac_is_end(c)) { 193 av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n"); 194 return AVERROR_INVALIDDATA; 195 } 196 197 for (b=0; b<6; b++) { 198 int ct = 1; /* code type */ 199 200 if (b > 3) pt = 1; 201 202 ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] 203 + s->above_blocks[s->above_block_idx[b]].not_null_dc; 204 model1 = model->coeff_dccv[pt]; 205 model2 = model->coeff_dcct[pt][ctx]; 206 207 coeff_idx = 0; 208 for (;;) { 209 if (vp56_rac_get_prob_branchy(c, model2[0])) { 210 if (vp56_rac_get_prob_branchy(c, model2[2])) { 211 if (vp56_rac_get_prob_branchy(c, model2[3])) { 212 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; 213 idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); 214 sign = vp56_rac_get(c); 215 coeff = ff_vp56_coeff_bias[idx+5]; 216 for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) 217 coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; 218 } else { 219 if (vp56_rac_get_prob_branchy(c, model2[4])) { 220 coeff = 3 + vp56_rac_get_prob(c, model1[5]); 221 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; 222 } else { 223 coeff = 2; 224 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; 225 } 226 sign = vp56_rac_get(c); 227 } 228 ct = 2; 229 } else { 230 ct = 1; 231 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; 232 sign = vp56_rac_get(c); 233 coeff = 1; 234 } 235 coeff = (coeff ^ -sign) + sign; 236 if (coeff_idx) 237 coeff *= s->dequant_ac; 238 s->block_coeff[b][permute[coeff_idx]] = coeff; 239 } else { 240 if (ct && !vp56_rac_get_prob_branchy(c, model2[1])) 241 break; 242 ct = 0; 243 s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; 244 } 245 coeff_idx++; 246 if (coeff_idx >= 64) 247 break; 248 249 cg = vp5_coeff_groups[coeff_idx]; 250 ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; 251 model1 = model->coeff_ract[pt][ct][cg]; 252 model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; 253 } 254 255 ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); 256 s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; 257 if (coeff_idx < ctx_last) 258 for (i=coeff_idx; i<=ctx_last; i++) 259 s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; 260 s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; 261 s->idct_selector[b] = 63; 262 } 263 return 0; 264} 265 266static void vp5_default_models_init(VP56Context *s) 267{ 268 VP56Model *model = s->modelp; 269 int i; 270 271 for (i=0; i<2; i++) { 272 model->vector_sig[i] = 0x80; 273 model->vector_dct[i] = 0x80; 274 model->vector_pdi[i][0] = 0x55; 275 model->vector_pdi[i][1] = 0x80; 276 } 277 memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); 278 memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv)); 279} 280 281static av_cold int vp5_decode_init(AVCodecContext *avctx) 282{ 283 VP56Context *s = avctx->priv_data; 284 int ret; 285 286 if ((ret = ff_vp56_init_context(avctx, s, 1, 0)) < 0) 287 return ret; 288 ff_vp5dsp_init(&s->vp56dsp); 289 s->vp56_coord_div = vp5_coord_div; 290 s->parse_vector_adjustment = vp5_parse_vector_adjustment; 291 s->parse_coeff = vp5_parse_coeff; 292 s->default_models_init = vp5_default_models_init; 293 s->parse_vector_models = vp5_parse_vector_models; 294 s->parse_coeff_models = vp5_parse_coeff_models; 295 s->parse_header = vp5_parse_header; 296 297 return 0; 298} 299 300static av_cold int vp56_free(AVCodecContext *avctx) 301{ 302 VP56Context *const s = avctx->priv_data; 303 return ff_vp56_free_context(s); 304} 305 306const FFCodec ff_vp5_decoder = { 307 .p.name = "vp5", 308 .p.long_name = NULL_IF_CONFIG_SMALL("On2 VP5"), 309 .p.type = AVMEDIA_TYPE_VIDEO, 310 .p.id = AV_CODEC_ID_VP5, 311 .priv_data_size = sizeof(VP56Context), 312 .init = vp5_decode_init, 313 .close = vp56_free, 314 FF_CODEC_DECODE_CB(ff_vp56_decode_frame), 315 .p.capabilities = AV_CODEC_CAP_DR1, 316 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 317}; 318