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_config_link(AVFilterLink *link)
 100 {
 101     int *fmts[2], i, j;
 102     int (*config_link)(AVFilterLink *);
 103     int *(*query_formats)(AVFilterLink *link);
 104
 105     if(!link)
 106         return 0;
 107
 108     /* find a format both filters support - TODO: auto-insert conversion filter */
 109     link->format = -1;
 110     if(!(query_formats = link_spad(link).query_formats))
 111         query_formats = avfilter_default_query_output_formats;
 112     fmts[0] = query_formats(link);
 113     fmts[1] = link_dpad(link).query_formats(link);
 114     for(i = 0; fmts[0][i] != -1; i ++)
 115         for(j = 0; fmts[1][j] != -1; j ++)
 116             if(fmts[0][i] == fmts[1][j]) {
 117                 link->format = fmts[0][i];
 118                 goto format_done;
 119             }
 120
 121 format_done:
 122     av_free(fmts[0]);
 123     av_free(fmts[1]);
 124     if(link->format == -1)
 125         return -1;
 126
 127     if(!(config_link = link_spad(link).config_props))
 128         config_link  = avfilter_default_config_output_link;
 129     if(config_link(link))
 130             return -1;
 131
 132     if(!(config_link = link_dpad(link).config_props))
 133         config_link  = avfilter_default_config_input_link;
 134     if(config_link(link))
 135             return -1;
 136
 137     return 0;
 138 }
 139
 140 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
 141 {
 142     AVFilterPicRef *ret = NULL;
 143
 144     if(link_dpad(link).get_video_buffer)
 145         ret = link_dpad(link).get_video_buffer(link, perms);
 146
 147     if(!ret)
 148         ret = avfilter_default_get_video_buffer(link, perms);
 149
 150     return ret;
 151 }
 152
 153 int avfilter_request_frame(AVFilterLink *link)
 154 {
 155     if(link_spad(link).request_frame)
 156         return link_spad(link).request_frame(link);
 157     else if(link->src->inputs[0])
 158         return avfilter_request_frame(link->src->inputs[0]);
 159     else return -1;
 160 }
 161
 162 /* XXX: should we do the duplicating of the picture ref here, instead of
 163  * forcing the source filter to do it? */
 164 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 165 {
 166     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
 167
 168     if(!(start_frame = link_dpad(link).start_frame))
 169         start_frame = avfilter_default_start_frame;
 170
 171     /* prepare to copy the picture if it has insufficient permissions */
 172     if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
 173         link_dpad(link).rej_perms & picref->perms) {
 174         av_log(link->dst, AV_LOG_INFO,
 175                 "frame copy needed (have perms %x, need %x, reject %x)\n",
 176                 picref->perms,
 177                 link_dpad(link).min_perms, link_dpad(link).rej_perms);
 178
 179         link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
 180         link->srcpic = picref;
 181     }
 182     else
 183         link->cur_pic = picref;
 184
 185     start_frame(link, link->cur_pic);
 186 }
 187
 188 void avfilter_end_frame(AVFilterLink *link)
 189 {
 190     void (*end_frame)(AVFilterLink *);
 191
 192     /* unreference the source picture if we're feeding the destination filter
 193      * a copied version dues to permission issues */
 194     if(link->srcpic) {
 195         avfilter_unref_pic(link->srcpic);
 196         link->srcpic = NULL;
 197     }
 198
 199     if(!(end_frame = link_dpad(link).end_frame))
 200         end_frame = avfilter_default_end_frame;
 201
 202     end_frame(link);
 203 }
 204
 205 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
 206 {
 207     uint8_t *src[4], *dst[4];
 208     int i, j, hsub, vsub;
 209
 210     /* copy the slice if needed for permission reasons */
 211     if(link->srcpic) {
 212         avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
 213
 214         src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
 215         dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
 216         for(i = 1; i < 4; i ++) {
 217             if(link->srcpic->data[i]) {
 218                 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
 219                 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
 220             } else
 221                 src[i] = dst[i] = NULL;
 222         }
 223         for(j = 0; j < h; j ++) {
 224             memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
 225             src[0] += link->srcpic ->linesize[0];
 226             dst[0] += link->cur_pic->linesize[0];
 227         }
 228         for(i = 1; i < 4; i ++) {
 229             if(!src[i]) continue;
 230
 231             for(j = 0; j < h >> vsub; j ++) {
 232                 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
 233                 src[i] += link->srcpic ->linesize[i];
 234                 dst[i] += link->cur_pic->linesize[i];
 235             }
 236         }
 237     }
 238
 239     if(!link_dpad(link).draw_slice)
 240         return;
 241
 242     link_dpad(link).draw_slice(link, y, h);
 243 }
 244
 245 AVFilter *avfilter_get_by_name(char *name)
 246 {
 247     struct FilterList *filt;
 248
 249     for(filt = filters; filt; filt = filt->next)
 250         if(!strcmp(filt->filter->name, name))
 251             return filt->filter;
 252
 253     return NULL;
 254 }
 255
 256 /* FIXME: insert in order, rather than insert at end + resort */
 257 void avfilter_register(AVFilter *filter)
 258 {
 259     struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
 260
 261     newfilt->filter = filter;
 262     newfilt->next   = filters;
 263     filters         = newfilt;
 264 }
 265
 266 void avfilter_init(void)
 267 {
 268     avfilter_register(&vsrc_dummy);
 269     avfilter_register(&vsrc_ppm);
 270     avfilter_register(&vf_buffer);
 271     avfilter_register(&vf_crop);
 272     avfilter_register(&vf_fps);
 273     avfilter_register(&vf_graph);
 274     avfilter_register(&vf_graphdesc);
 275     avfilter_register(&vf_graphfile);
 276     avfilter_register(&vf_overlay);
 277     avfilter_register(&vf_passthrough);
 278     avfilter_register(&vf_rgb2bgr);
 279     avfilter_register(&vf_slicify);
 280     avfilter_register(&vf_vflip);
 281 }
 282
 283 void avfilter_uninit(void)
 284 {
 285     struct FilterList *tmp;
 286
 287     for(; filters; filters = tmp) {
 288         tmp = filters->next;
 289         av_free(filters);
 290     }
 291 }
 292
 293 static int pad_count(const AVFilterPad *pads)
 294 {
 295     AVFilterPad *p = (AVFilterPad *) pads;
 296     int count;
 297
 298     for(count = 0; p->name; count ++) p ++;
 299     return count;
 300 }
 301
 302 static const char *filter_name(void *p)
 303 {
 304     AVFilterContext *filter = p;
 305     return filter->filter->name;
 306 }
 307
 308 AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
 309 {
 310     AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
 311
 312     ret->av_class = av_mallocz(sizeof(AVClass));
 313     ret->av_class->item_name = filter_name;
 314     ret->filter   = filter;
 315     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 316     ret->priv     = av_mallocz(filter->priv_size);
 317
 318     ret->input_count  = pad_count(filter->inputs);
 319     ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
 320     memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
 321     ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
 322
 323     ret->output_count = pad_count(filter->outputs);
 324     ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
 325     memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
 326     ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
 327
 328     return ret;
 329 }
 330
 331 void avfilter_destroy(AVFilterContext *filter)
 332 {
 333     int i;
 334
 335     if(filter->filter->uninit)
 336         filter->filter->uninit(filter);
 337
 338     for(i = 0; i < filter->input_count; i ++) {
 339         if(filter->inputs[i])
 340             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
 341         av_freep(&filter->inputs[i]);
 342     }
 343     for(i = 0; i < filter->output_count; i ++) {
 344         if(filter->outputs[i])
 345             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
 346         av_freep(&filter->outputs[i]);
 347     }
 348
 349     av_freep(&filter->name);
 350     av_freep(&filter->input_pads);
 351     av_freep(&filter->output_pads);
 352     av_freep(&filter->inputs);
 353     av_freep(&filter->outputs);
 354     av_freep(&filter->priv);
 355     av_freep(&filter->av_class);
 356     av_free(filter);
 357 }
 358
 359 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 360 {
 361     int ret;
 362
 363     if(filter->filter->init)
 364         if((ret = filter->filter->init(filter, args, opaque))) return ret;
 365     return 0;
 366 }
 367
 368 int *avfilter_make_format_list(int len, ...)
 369 {
 370     int *ret, i;
 371     va_list vl;
 372
 373     ret = av_malloc(sizeof(int) * (len + 1));
 374     va_start(vl, len);
 375     for(i = 0; i < len; i ++)
 376         ret[i] = va_arg(vl, int);
 377     va_end(vl);
 378     ret[len] = -1;
 379
 380     return ret;
 381 }
 382