1/* 2 * filter layer 3 * copyright (c) 2007 Bobby Bingham 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavcodec/imgconvert.h" 23#include "avfilter.h" 24 25unsigned avfilter_version(void) { 26 return LIBAVFILTER_VERSION_INT; 27} 28 29/** list of registered filters */ 30struct FilterList 31{ 32 AVFilter *filter; 33 struct FilterList *next; 34} *filters = NULL; 35 36/** helper macros to get the in/out pad on the dst/src filter */ 37#define link_dpad(link) link->dst-> input_pads[link->dstpad] 38#define link_spad(link) link->src->output_pads[link->srcpad] 39 40AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask) 41{ 42 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef)); 43 *ret = *ref; 44 ret->perms &= pmask; 45 ret->pic->refcount ++; 46 return ret; 47} 48 49void avfilter_unref_pic(AVFilterPicRef *ref) 50{ 51 if(!(--ref->pic->refcount)) 52 ref->pic->free(ref->pic); 53 av_free(ref); 54} 55 56void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off, 57 AVFilterPad **pads, AVFilterLink ***links, 58 AVFilterPad *newpad) 59{ 60 unsigned i; 61 62 idx = FFMIN(idx, *count); 63 64 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1)); 65 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1)); 66 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx)); 67 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx)); 68 memcpy(*pads+idx, newpad, sizeof(AVFilterPad)); 69 (*links)[idx] = NULL; 70 71 (*count) ++; 72 for(i = idx+1; i < *count; i ++) 73 if(*links[i]) 74 (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++; 75} 76 77int avfilter_link(AVFilterContext *src, unsigned srcpad, 78 AVFilterContext *dst, unsigned dstpad) 79{ 80 AVFilterLink *link; 81 82 if(src->output_count <= srcpad || dst->input_count <= dstpad || 83 src->outputs[srcpad] || dst->inputs[dstpad]) 84 return -1; 85 86 src->outputs[srcpad] = 87 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink)); 88 89 link->src = src; 90 link->dst = dst; 91 link->srcpad = srcpad; 92 link->dstpad = dstpad; 93 link->format = PIX_FMT_NONE; 94 95 return 0; 96} 97 98int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt, 99 unsigned in, unsigned out) 100{ 101 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n", 102 filt->filter->name); 103 104 link->dst->inputs[link->dstpad] = NULL; 105 if(avfilter_link(filt, out, link->dst, link->dstpad)) { 106 /* failed to link output filter to new filter */ 107 link->dst->inputs[link->dstpad] = link; 108 return -1; 109 } 110 111 /* re-hookup the link to the new destination filter we inserted */ 112 link->dst = filt; 113 link->dstpad = in; 114 filt->inputs[in] = link; 115 116 /* if any information on supported colorspaces already exists on the 117 * link, we need to preserve that */ 118 if(link->out_formats) 119 avfilter_formats_changeref(&link->out_formats, 120 &filt->outputs[out]->out_formats); 121 122 return 0; 123} 124 125int avfilter_config_links(AVFilterContext *filter) 126{ 127 int (*config_link)(AVFilterLink *); 128 unsigned i; 129 130 for(i = 0; i < filter->input_count; i ++) { 131 AVFilterLink *link = filter->inputs[i]; 132 133 if(!link) continue; 134 135 switch(link->init_state) { 136 case AVLINK_INIT: 137 continue; 138 case AVLINK_STARTINIT: 139 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n"); 140 return 0; 141 case AVLINK_UNINIT: 142 link->init_state = AVLINK_STARTINIT; 143 144 if(avfilter_config_links(link->src)) 145 return -1; 146 147 if(!(config_link = link_spad(link).config_props)) 148 config_link = avfilter_default_config_output_link; 149 if(config_link(link)) 150 return -1; 151 152 if((config_link = link_dpad(link).config_props)) 153 if(config_link(link)) 154 return -1; 155 156 link->init_state = AVLINK_INIT; 157 } 158 } 159 160 return 0; 161} 162 163AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms) 164{ 165 AVFilterPicRef *ret = NULL; 166 167 if(link_dpad(link).get_video_buffer) 168 ret = link_dpad(link).get_video_buffer(link, perms); 169 170 if(!ret) 171 ret = avfilter_default_get_video_buffer(link, perms); 172 173 return ret; 174} 175 176int avfilter_request_frame(AVFilterLink *link) 177{ 178 if(link_spad(link).request_frame) 179 return link_spad(link).request_frame(link); 180 else if(link->src->inputs[0]) 181 return avfilter_request_frame(link->src->inputs[0]); 182 else return -1; 183} 184 185int avfilter_poll_frame(AVFilterLink *link) 186{ 187 int i, min=INT_MAX; 188 189 if(link_spad(link).poll_frame) 190 return link_spad(link).poll_frame(link); 191 192 for (i=0; i<link->src->input_count; i++) { 193 if(!link->src->inputs[i]) 194 return -1; 195 min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i])); 196 } 197 198 return min; 199} 200 201/* XXX: should we do the duplicating of the picture ref here, instead of 202 * forcing the source filter to do it? */ 203void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref) 204{ 205 void (*start_frame)(AVFilterLink *, AVFilterPicRef *); 206 AVFilterPad *dst = &link_dpad(link); 207 208 if(!(start_frame = dst->start_frame)) 209 start_frame = avfilter_default_start_frame; 210 211 /* prepare to copy the picture if it has insufficient permissions */ 212 if((dst->min_perms & picref->perms) != dst->min_perms || 213 dst->rej_perms & picref->perms) { 214 /* 215 av_log(link->dst, AV_LOG_INFO, 216 "frame copy needed (have perms %x, need %x, reject %x)\n", 217 picref->perms, 218 link_dpad(link).min_perms, link_dpad(link).rej_perms); 219 */ 220 221 link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms); 222 link->srcpic = picref; 223 link->cur_pic->pts = link->srcpic->pts; 224 } 225 else 226 link->cur_pic = picref; 227 228 start_frame(link, link->cur_pic); 229} 230 231void avfilter_end_frame(AVFilterLink *link) 232{ 233 void (*end_frame)(AVFilterLink *); 234 235 if(!(end_frame = link_dpad(link).end_frame)) 236 end_frame = avfilter_default_end_frame; 237 238 end_frame(link); 239 240 /* unreference the source picture if we're feeding the destination filter 241 * a copied version dues to permission issues */ 242 if(link->srcpic) { 243 avfilter_unref_pic(link->srcpic); 244 link->srcpic = NULL; 245 } 246 247} 248 249void avfilter_draw_slice(AVFilterLink *link, int y, int h) 250{ 251 uint8_t *src[4], *dst[4]; 252 int i, j, hsub, vsub; 253 void (*draw_slice)(AVFilterLink *, int, int); 254 255 /* copy the slice if needed for permission reasons */ 256 if(link->srcpic) { 257 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub); 258 259 for(i = 0; i < 4; i ++) { 260 if(link->srcpic->data[i]) { 261 src[i] = link->srcpic-> data[i] + 262 (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i]; 263 dst[i] = link->cur_pic->data[i] + 264 (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i]; 265 } else 266 src[i] = dst[i] = NULL; 267 } 268 269 for(i = 0; i < 4; i ++) { 270 int planew = 271 ff_get_plane_bytewidth(link->format, link->cur_pic->w, i); 272 273 if(!src[i]) continue; 274 275 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) { 276 memcpy(dst[i], src[i], planew); 277 src[i] += link->srcpic ->linesize[i]; 278 dst[i] += link->cur_pic->linesize[i]; 279 } 280 } 281 } 282 283 if(!(draw_slice = link_dpad(link).draw_slice)) 284 draw_slice = avfilter_default_draw_slice; 285 draw_slice(link, y, h); 286} 287 288AVFilter *avfilter_get_by_name(const char *name) 289{ 290 struct FilterList *filt; 291 292 for(filt = filters; filt; filt = filt->next) 293 if(!strcmp(filt->filter->name, name)) 294 return filt->filter; 295 296 return NULL; 297} 298 299void avfilter_register(AVFilter *filter) 300{ 301 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList)); 302 303 newfilt->filter = filter; 304 newfilt->next = filters; 305 filters = newfilt; 306} 307 308void avfilter_uninit(void) 309{ 310 struct FilterList *tmp; 311 312 for(; filters; filters = tmp) { 313 tmp = filters->next; 314 av_free(filters); 315 } 316} 317 318static int pad_count(const AVFilterPad *pads) 319{ 320 int count; 321 322 for(count = 0; pads->name; count ++) pads ++; 323 return count; 324} 325 326static const char *filter_name(void *p) 327{ 328 AVFilterContext *filter = p; 329 return filter->filter->name; 330} 331 332static const AVClass avfilter_class = { 333 "AVFilter", 334 filter_name 335}; 336 337AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name) 338{ 339 AVFilterContext *ret; 340 341 if (!filter) 342 return 0; 343 344 ret = av_mallocz(sizeof(AVFilterContext)); 345 346 ret->av_class = &avfilter_class; 347 ret->filter = filter; 348 ret->name = inst_name ? av_strdup(inst_name) : NULL; 349 ret->priv = av_mallocz(filter->priv_size); 350 351 ret->input_count = pad_count(filter->inputs); 352 if (ret->input_count) { 353 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count); 354 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count); 355 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count); 356 } 357 358 ret->output_count = pad_count(filter->outputs); 359 if (ret->output_count) { 360 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count); 361 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count); 362 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count); 363 } 364 365 return ret; 366} 367 368void avfilter_destroy(AVFilterContext *filter) 369{ 370 int i; 371 372 if(filter->filter->uninit) 373 filter->filter->uninit(filter); 374 375 for(i = 0; i < filter->input_count; i ++) { 376 if(filter->inputs[i]) 377 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL; 378 av_freep(&filter->inputs[i]); 379 } 380 for(i = 0; i < filter->output_count; i ++) { 381 if(filter->outputs[i]) 382 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL; 383 av_freep(&filter->outputs[i]); 384 } 385 386 av_freep(&filter->name); 387 av_freep(&filter->input_pads); 388 av_freep(&filter->output_pads); 389 av_freep(&filter->inputs); 390 av_freep(&filter->outputs); 391 av_freep(&filter->priv); 392 av_free(filter); 393} 394 395int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque) 396{ 397 int ret=0; 398 399 if(filter->filter->init) 400 ret = filter->filter->init(filter, args, opaque); 401 return ret; 402} 403 404