git.sesse.net Git - ffmpeg/blob - libavfilter/avfilter.c

   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 "avfilter.h"
  23 #include "allfilters.h"
  24
  25 /** list of registered filters */
  26 struct FilterList
  27 {
  28     AVFilter *filter;
  29     struct FilterList *next;
  30 } *filters = NULL;
  31
  32 /** helper macros to get the in/out pad on the dst/src filter */
  33 #define link_dpad(link)     link->dst-> input_pads[link->dstpad]
  34 #define link_spad(link)     link->src->output_pads[link->srcpad]
  35
  36 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
  37 {
  38     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
  39     *ret = *ref;
  40     ret->perms &= pmask;
  41     ret->pic->refcount ++;
  42     return ret;
  43 }
  44
  45 void avfilter_unref_pic(AVFilterPicRef *ref)
  46 {
  47     if(!(--ref->pic->refcount))
  48         ref->pic->free(ref->pic);
  49     av_free(ref);
  50 }
  51
  52 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
  53                          AVFilterPad **pads, AVFilterLink ***links,
  54                          AVFilterPad *newpad)
  55 {
  56     unsigned i;
  57
  58     idx = FFMIN(idx, *count);
  59
  60     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
  61     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
  62     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
  63     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
  64     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
  65     (*links)[idx] = NULL;
  66
  67     (*count) ++;
  68     for(i = idx+1; i < *count; i ++)
  69         if(*links[i])
  70             (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
  71 }
  72
  73 int avfilter_link(AVFilterContext *src, unsigned srcpad,
  74                   AVFilterContext *dst, unsigned dstpad)
  75 {
  76     AVFilterLink *link;
  77
  78     if(src->output_count <= srcpad || dst->input_count <= dstpad ||
  79        src->outputs[srcpad]        || dst->inputs[dstpad])
  80         return -1;
  81
  82     src->outputs[srcpad] =
  83     dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
  84
  85     link->src     = src;
  86     link->dst     = dst;
  87     link->srcpad  = srcpad;
  88     link->dstpad  = dstpad;
  89     link->format  = -1;
  90
  91     return 0;
  92 }
  93
  94 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
  95                            unsigned in, unsigned out)
  96 {
  97     av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
  98             filt->filter->name);
  99
 100     link->dst->inputs[link->dstpad] = NULL;
 101     if(avfilter_link(filt, out, link->dst, link->dstpad)) {
 102         /* failed to link output filter to new filter */
 103         link->dst->inputs[link->dstpad] = link;
 104         return -1;
 105     }
 106
 107     /* re-hookup the link to the new destination filter we inserted */
 108     link->dst = filt;
 109     link->dstpad = in;
 110     filt->inputs[in] = link;
 111
 112     /* if any information on supported colorspaces already exists on the
 113      * link, we need to preserve that */
 114     if(link->out_formats)
 115         avfilter_formats_changeref(&link->out_formats,
 116                                    &filt->outputs[out]->out_formats);
 117
 118     return 0;
 119 }
 120
 121 int avfilter_config_links(AVFilterContext *filter)
 122 {
 123     int (*config_link)(AVFilterLink *);
 124     unsigned i;
 125
 126     for(i = 0; i < filter->input_count; i ++) {
 127         AVFilterLink *link = filter->inputs[i];
 128
 129         if(!link) continue;
 130
 131         switch(link->init_state) {
 132         case AVLINK_INIT:
 133             continue;
 134         case AVLINK_STARTINIT:
 135             av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
 136             return 0;
 137         case AVLINK_UNINIT:
 138             link->init_state = AVLINK_STARTINIT;
 139
 140             if(avfilter_config_links(link->src))
 141                 return -1;
 142
 143             if(!(config_link = link_spad(link).config_props))
 144                 config_link  = avfilter_default_config_output_link;
 145             if(config_link(link))
 146                 return -1;
 147
 148             if((config_link = link_dpad(link).config_props))
 149                 if(config_link(link))
 150                     return -1;
 151
 152             link->init_state = AVLINK_INIT;
 153         }
 154     }
 155
 156     return 0;
 157 }
 158
 159 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
 160 {
 161     AVFilterPicRef *ret = NULL;
 162
 163     if(link_dpad(link).get_video_buffer)
 164         ret = link_dpad(link).get_video_buffer(link, perms);
 165
 166     if(!ret)
 167         ret = avfilter_default_get_video_buffer(link, perms);
 168
 169     return ret;
 170 }
 171
 172 int avfilter_request_frame(AVFilterLink *link)
 173 {
 174     if(link_spad(link).request_frame)
 175         return link_spad(link).request_frame(link);
 176     else if(link->src->inputs[0])
 177         return avfilter_request_frame(link->src->inputs[0]);
 178     else return -1;
 179 }
 180
 181 int avfilter_poll_frame(AVFilterLink *link)
 182 {
 183     int i, min=INT_MAX;
 184
 185     if(link_spad(link).poll_frame)
 186         return link_spad(link).poll_frame(link);
 187         for (i=0; i<link->src->input_count; i++) {
 188             if(!link->src->inputs[i])
 189                 return -1;
 190             min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
 191         }
 192
 193     return min;
 194 }
 195
 196 /* XXX: should we do the duplicating of the picture ref here, instead of
 197  * forcing the source filter to do it? */
 198 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 199 {
 200     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
 201     AVFilterPad *dst = &link_dpad(link);
 202
 203     if(!(start_frame = dst->start_frame))
 204         start_frame = avfilter_default_start_frame;
 205
 206     /* prepare to copy the picture if it has insufficient permissions */
 207     if((dst->min_perms & picref->perms) != dst->min_perms ||
 208         dst->rej_perms & picref->perms) {
 209         /*
 210         av_log(link->dst, AV_LOG_INFO,
 211                 "frame copy needed (have perms %x, need %x, reject %x)\n",
 212                 picref->perms,
 213                 link_dpad(link).min_perms, link_dpad(link).rej_perms);
 214         */
 215
 216         link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
 217         link->srcpic = picref;
 218         link->cur_pic->pts = link->srcpic->pts;
 219     }
 220     else
 221         link->cur_pic = picref;
 222
 223     start_frame(link, link->cur_pic);
 224 }
 225
 226 void avfilter_end_frame(AVFilterLink *link)
 227 {
 228     void (*end_frame)(AVFilterLink *);
 229
 230     if(!(end_frame = link_dpad(link).end_frame))
 231         end_frame = avfilter_default_end_frame;
 232
 233     end_frame(link);
 234
 235     /* unreference the source picture if we're feeding the destination filter
 236      * a copied version dues to permission issues */
 237     if(link->srcpic) {
 238         avfilter_unref_pic(link->srcpic);
 239         link->srcpic = NULL;
 240     }
 241
 242 }
 243
 244 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
 245 {
 246     uint8_t *src[4], *dst[4];
 247     int i, j, hsub, vsub;
 248
 249     /* copy the slice if needed for permission reasons */
 250     if(link->srcpic) {
 251         avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
 252
 253         src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
 254         dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
 255         for(i = 1; i < 4; i ++) {
 256             if(link->srcpic->data[i]) {
 257                 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
 258                 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
 259             } else
 260                 src[i] = dst[i] = NULL;
 261         }
 262
 263         for(i = 0; i < 4; i ++) {
 264             if(!src[i]) continue;
 265
 266             for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
 267                 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
 268                 src[i] += link->srcpic ->linesize[i];
 269                 dst[i] += link->cur_pic->linesize[i];
 270             }
 271         }
 272     }
 273
 274     if(!link_dpad(link).draw_slice)
 275         return;
 276
 277     link_dpad(link).draw_slice(link, y, h);
 278 }
 279
 280 AVFilter *avfilter_get_by_name(const char *name)
 281 {
 282     struct FilterList *filt;
 283
 284     for(filt = filters; filt; filt = filt->next)
 285         if(!strcmp(filt->filter->name, name))
 286             return filt->filter;
 287
 288     return NULL;
 289 }
 290
 291 void avfilter_register(AVFilter *filter)
 292 {
 293     struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
 294
 295     newfilt->filter = filter;
 296     newfilt->next   = filters;
 297     filters         = newfilt;
 298 }
 299
 300 void avfilter_init(void)
 301 {
 302     avfilter_register(&avfilter_vf_crop);
 303     avfilter_register(&avfilter_vf_fifo);
 304     avfilter_register(&avfilter_vf_format);
 305     avfilter_register(&avfilter_vf_fps);
 306     avfilter_register(&avfilter_vf_graph);
 307     avfilter_register(&avfilter_vf_graphdesc);
 308     avfilter_register(&avfilter_vf_graphfile);
 309     avfilter_register(&avfilter_vf_hflip);
 310     avfilter_register(&avfilter_vf_negate);
 311     avfilter_register(&avfilter_vf_noformat);
 312     avfilter_register(&avfilter_vf_overlay);
 313     avfilter_register(&avfilter_vf_rotate);
 314     avfilter_register(&avfilter_vf_scale);
 315     avfilter_register(&avfilter_vf_setpts);
 316     avfilter_register(&avfilter_vf_slicify);
 317     avfilter_register(&avfilter_vf_split);
 318     avfilter_register(&avfilter_vf_transpose);
 319     avfilter_register(&avfilter_vf_vflip);
 320 #ifdef CONFIG_AVFILTER_LAVF
 321     avfilter_register(&avfilter_vsrc_movie);
 322 #endif //CONFIG_AVFILTER_LAVF
 323 }
 324
 325 void avfilter_uninit(void)
 326 {
 327     struct FilterList *tmp;
 328
 329     for(; filters; filters = tmp) {
 330         tmp = filters->next;
 331         av_free(filters);
 332     }
 333 }
 334
 335 static int pad_count(const AVFilterPad *pads)
 336 {
 337     int count;
 338
 339     for(count = 0; pads->name; count ++) pads ++;
 340     return count;
 341 }
 342
 343 static const char *filter_name(void *p)
 344 {
 345     AVFilterContext *filter = p;
 346     return filter->filter->name;
 347 }
 348
 349 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
 350 {
 351     AVFilterContext *ret;
 352
 353     if (!filter)
 354         return 0;
 355
 356     ret = av_malloc(sizeof(AVFilterContext));
 357
 358     ret->av_class = av_mallocz(sizeof(AVClass));
 359     ret->av_class->item_name = filter_name;
 360     ret->filter   = filter;
 361     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 362     ret->priv     = av_mallocz(filter->priv_size);
 363
 364     ret->input_count  = pad_count(filter->inputs);
 365     ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
 366     memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
 367     ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
 368
 369     ret->output_count = pad_count(filter->outputs);
 370     ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
 371     memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
 372     ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
 373
 374     return ret;
 375 }
 376
 377 void avfilter_destroy(AVFilterContext *filter)
 378 {
 379     int i;
 380
 381     if(filter->filter->uninit)
 382         filter->filter->uninit(filter);
 383
 384     for(i = 0; i < filter->input_count; i ++) {
 385         if(filter->inputs[i])
 386             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
 387         av_freep(&filter->inputs[i]);
 388     }
 389     for(i = 0; i < filter->output_count; i ++) {
 390         if(filter->outputs[i])
 391             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
 392         av_freep(&filter->outputs[i]);
 393     }
 394
 395     av_freep(&filter->name);
 396     av_freep(&filter->input_pads);
 397     av_freep(&filter->output_pads);
 398     av_freep(&filter->inputs);
 399     av_freep(&filter->outputs);
 400     av_freep(&filter->priv);
 401     av_freep(&filter->av_class);
 402     av_free(filter);
 403 }
 404
 405 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 406 {
 407     int ret=0;
 408
 409     if(filter->filter->init)
 410         ret = filter->filter->init(filter, args, opaque);
 411     return ret;
 412 }
 413