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 <stdarg.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26
  27 #include "avfilter.h"
  28 #include "allfilters.h"
  29
  30 /** list of registered filters */
  31 struct FilterList
  32 {
  33     AVFilter *filter;
  34     struct FilterList *next;
  35 } *filters = NULL;
  36
  37 /** helper macros to get the in/out pad on the dst/src filter */
  38 #define link_dpad(link)     link->dst-> input_pads[link->dstpad]
  39 #define link_spad(link)     link->src->output_pads[link->srcpad]
  40
  41 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
  42 {
  43     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
  44     *ret = *ref;
  45     ret->perms &= pmask;
  46     ret->pic->refcount ++;
  47     return ret;
  48 }
  49
  50 void avfilter_unref_pic(AVFilterPicRef *ref)
  51 {
  52     if(-- ref->pic->refcount == 0)
  53         ref->pic->free(ref->pic);
  54     av_free(ref);
  55 }
  56
  57 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
  58                          AVFilterPad **pads, AVFilterLink ***links,
  59                          AVFilterPad *newpad)
  60 {
  61     unsigned i;
  62
  63     idx = FFMIN(idx, *count);
  64
  65     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
  66     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
  67     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
  68     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
  69     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
  70     (*links)[idx] = NULL;
  71
  72     (*count) ++;
  73     for(i = idx+1; i < *count; i ++)
  74         if(*links[i])
  75             (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
  76 }
  77
  78 int avfilter_link(AVFilterContext *src, unsigned srcpad,
  79                   AVFilterContext *dst, unsigned dstpad)
  80 {
  81     AVFilterLink *link;
  82
  83     if(src->output_count <= srcpad || dst->input_count <= dstpad ||
  84        src->outputs[srcpad]        || dst->inputs[dstpad])
  85         return -1;
  86
  87     src->outputs[srcpad] =
  88     dst->inputs[dstpad]  = link = av_mallocz(sizeof(AVFilterLink));
  89
  90     link->src     = src;
  91     link->dst     = dst;
  92     link->srcpad  = srcpad;
  93     link->dstpad  = dstpad;
  94     link->format  = -1;
  95
  96     return 0;
  97 }
  98
  99 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
 100                            unsigned in, unsigned out)
 101 {
 102     AVFilterFormats *formats;
 103
 104     av_log(NULL, AV_LOG_INFO, "auto-inserting filter '%s'\n",
 105             filt->filter->name);
 106
 107     link->dst->inputs[link->dstpad] = NULL;
 108     if(avfilter_link(filt, out, link->dst, link->dstpad)) {
 109         /* failed to link output filter to new filter */
 110         link->dst->inputs[link->dstpad] = link;
 111         return -1;
 112     }
 113
 114     /* re-hookup the link to the new destination filter we inserted */
 115     link->dst = filt;
 116     link->dstpad = in;
 117     filt->inputs[in] = link;
 118
 119     /* if any information on supported colorspaces already exists on the
 120      * link, we need to preserve that */
 121     if((formats = link->out_formats))
 122         avfilter_formats_changeref(&link->out_formats,
 123                                    &filt->outputs[out]->out_formats);
 124
 125     return 0;
 126 }
 127
 128 int avfilter_config_links(AVFilterContext *filter)
 129 {
 130     int (*config_link)(AVFilterLink *);
 131     unsigned i;
 132
 133     for(i = 0; i < filter->input_count; i ++) {
 134         AVFilterLink *link;
 135
 136         if(!(link = filter->inputs[i])) continue;
 137
 138         switch(link->init_state) {
 139         case AVLINK_INIT:
 140             continue;
 141         case AVLINK_STARTINIT:
 142             av_log(filter, AV_LOG_ERROR, "circular filter chain detected\n");
 143             return -1;
 144         case AVLINK_UNINIT:
 145             link->init_state = AVLINK_STARTINIT;
 146
 147             if(avfilter_config_links(link->src))
 148                 return -1;
 149
 150             if(!(config_link = link_spad(link).config_props))
 151                 config_link  = avfilter_default_config_output_link;
 152             if(config_link(link))
 153                 return -1;
 154
 155             if((config_link = link_dpad(link).config_props))
 156             if(config_link(link))
 157                 return -1;
 158
 159             link->init_state = AVLINK_INIT;
 160         }
 161     }
 162
 163     return 0;
 164 }
 165
 166 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
 167 {
 168     AVFilterPicRef *ret = NULL;
 169
 170     if(link_dpad(link).get_video_buffer)
 171         ret = link_dpad(link).get_video_buffer(link, perms);
 172
 173     if(!ret)
 174         ret = avfilter_default_get_video_buffer(link, perms);
 175
 176     return ret;
 177 }
 178
 179 int avfilter_request_frame(AVFilterLink *link)
 180 {
 181     if(link_spad(link).request_frame)
 182         return link_spad(link).request_frame(link);
 183     else if(link->src->inputs[0])
 184         return avfilter_request_frame(link->src->inputs[0]);
 185     else return -1;
 186 }
 187
 188 int avfilter_poll_frame(AVFilterLink *link)
 189 {
 190     int i, min=INT_MAX;
 191
 192     if(link_spad(link).poll_frame)
 193         return link_spad(link).poll_frame(link);
 194     else
 195         for (i=0; i<link->src->input_count; i++) {
 196             if(!link->src->inputs[i])
 197                 return -1;
 198             min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
 199         }
 200
 201     return min;
 202 }
 203
 204 /* XXX: should we do the duplicating of the picture ref here, instead of
 205  * forcing the source filter to do it? */
 206 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 207 {
 208     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
 209
 210     if(!(start_frame = link_dpad(link).start_frame))
 211         start_frame = avfilter_default_start_frame;
 212
 213     /* prepare to copy the picture if it has insufficient permissions */
 214     if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
 215         link_dpad(link).rej_perms & picref->perms) {
 216         /*
 217         av_log(link->dst, AV_LOG_INFO,
 218                 "frame copy needed (have perms %x, need %x, reject %x)\n",
 219                 picref->perms,
 220                 link_dpad(link).min_perms, link_dpad(link).rej_perms);
 221         */
 222
 223         link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
 224         link->srcpic = picref;
 225     }
 226     else
 227         link->cur_pic = picref;
 228
 229     start_frame(link, link->cur_pic);
 230 }
 231
 232 void avfilter_end_frame(AVFilterLink *link)
 233 {
 234     void (*end_frame)(AVFilterLink *);
 235
 236     if(!(end_frame = link_dpad(link).end_frame))
 237         end_frame = avfilter_default_end_frame;
 238
 239     end_frame(link);
 240
 241     /* unreference the source picture if we're feeding the destination filter
 242      * a copied version dues to permission issues */
 243     if(link->srcpic) {
 244         avfilter_unref_pic(link->srcpic);
 245         link->srcpic = NULL;
 246     }
 247
 248 }
 249
 250 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
 251 {
 252     uint8_t *src[4], *dst[4];
 253     int i, j, hsub, vsub;
 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         link->cur_pic->pts = link->srcpic->pts;
 260         src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
 261         dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
 262         for(i = 1; i < 4; i ++) {
 263             if(link->srcpic->data[i]) {
 264                 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
 265                 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
 266             } else
 267                 src[i] = dst[i] = NULL;
 268         }
 269         for(j = 0; j < h; j ++) {
 270             memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
 271             src[0] += link->srcpic ->linesize[0];
 272             dst[0] += link->cur_pic->linesize[0];
 273         }
 274         for(i = 1; i < 4; i ++) {
 275             if(!src[i]) continue;
 276
 277             for(j = 0; j < h >> vsub; j ++) {
 278                 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
 279                 src[i] += link->srcpic ->linesize[i];
 280                 dst[i] += link->cur_pic->linesize[i];
 281             }
 282         }
 283     }
 284
 285     if(!link_dpad(link).draw_slice)
 286         return;
 287
 288     link_dpad(link).draw_slice(link, y, h);
 289 }
 290
 291 AVFilter *avfilter_get_by_name(const char *name)
 292 {
 293     struct FilterList *filt;
 294
 295     for(filt = filters; filt; filt = filt->next)
 296         if(!strcmp(filt->filter->name, name))
 297             return filt->filter;
 298
 299     return NULL;
 300 }
 301
 302 void avfilter_register(AVFilter *filter)
 303 {
 304     struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
 305
 306     newfilt->filter = filter;
 307     newfilt->next   = filters;
 308     filters         = newfilt;
 309 }
 310
 311 void avfilter_init(void)
 312 {
 313     avfilter_register(&avfilter_vf_crop);
 314     avfilter_register(&avfilter_vf_fifo);
 315     avfilter_register(&avfilter_vf_format);
 316     avfilter_register(&avfilter_vf_fps);
 317     avfilter_register(&avfilter_vf_graph);
 318     avfilter_register(&avfilter_vf_graphdesc);
 319     avfilter_register(&avfilter_vf_graphfile);
 320     avfilter_register(&avfilter_vf_hflip);
 321     avfilter_register(&avfilter_vf_negate);
 322     avfilter_register(&avfilter_vf_noformat);
 323     avfilter_register(&avfilter_vf_overlay);
 324     avfilter_register(&avfilter_vf_rotate);
 325     avfilter_register(&avfilter_vf_scale);
 326     avfilter_register(&avfilter_vf_setpts);
 327     avfilter_register(&avfilter_vf_slicify);
 328     avfilter_register(&avfilter_vf_split);
 329     avfilter_register(&avfilter_vf_transpose);
 330     avfilter_register(&avfilter_vf_vflip);
 331 #ifdef CONFIG_AVFILTER_LAVF
 332     avfilter_register(&avfilter_vsrc_movie);
 333 #endif //CONFIG_AVFILTER_LAVF
 334 }
 335
 336 void avfilter_uninit(void)
 337 {
 338     struct FilterList *tmp;
 339
 340     for(; filters; filters = tmp) {
 341         tmp = filters->next;
 342         av_free(filters);
 343     }
 344 }
 345
 346 static int pad_count(const AVFilterPad *pads)
 347 {
 348     int count;
 349
 350     for(count = 0; pads->name; count ++) pads ++;
 351     return count;
 352 }
 353
 354 static const char *filter_name(void *p)
 355 {
 356     AVFilterContext *filter = p;
 357     return filter->filter->name;
 358 }
 359
 360 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
 361 {
 362     AVFilterContext *ret;
 363
 364     if (!filter)
 365         return 0;
 366
 367     ret = av_malloc(sizeof(AVFilterContext));
 368
 369     ret->av_class = av_mallocz(sizeof(AVClass));
 370     ret->av_class->item_name = filter_name;
 371     ret->filter   = filter;
 372     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 373     ret->priv     = av_mallocz(filter->priv_size);
 374
 375     ret->input_count  = pad_count(filter->inputs);
 376     ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
 377     memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
 378     ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
 379
 380     ret->output_count = pad_count(filter->outputs);
 381     ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
 382     memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
 383     ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
 384
 385     return ret;
 386 }
 387
 388 void avfilter_destroy(AVFilterContext *filter)
 389 {
 390     int i;
 391
 392     if(filter->filter->uninit)
 393         filter->filter->uninit(filter);
 394
 395     for(i = 0; i < filter->input_count; i ++) {
 396         if(filter->inputs[i])
 397             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
 398         av_freep(&filter->inputs[i]);
 399     }
 400     for(i = 0; i < filter->output_count; i ++) {
 401         if(filter->outputs[i])
 402             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
 403         av_freep(&filter->outputs[i]);
 404     }
 405
 406     av_freep(&filter->name);
 407     av_freep(&filter->input_pads);
 408     av_freep(&filter->output_pads);
 409     av_freep(&filter->inputs);
 410     av_freep(&filter->outputs);
 411     av_freep(&filter->priv);
 412     av_freep(&filter->av_class);
 413     av_free(filter);
 414 }
 415
 416 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 417 {
 418     int ret;
 419
 420     if(filter->filter->init)
 421         if((ret = filter->filter->init(filter, args, opaque))) return ret;
 422     return 0;
 423 }
 424