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 /* #define DEBUG */
  23
  24 #include "libavcodec/imgconvert.h"
  25 #include "avfilter.h"
  26
  27 unsigned avfilter_version(void) {
  28     return LIBAVFILTER_VERSION_INT;
  29 }
  30
  31 /** list of registered filters */
  32 static struct FilterList
  33 {
  34     AVFilter *filter;
  35     struct FilterList *next;
  36 } *filters = NULL;
  37
  38 /** helper macros to get the in/out pad on the dst/src filter */
  39 #define link_dpad(link)     link->dst-> input_pads[link->dstpad]
  40 #define link_spad(link)     link->src->output_pads[link->srcpad]
  41
  42 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
  43 {
  44     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
  45     *ret = *ref;
  46     ret->perms &= pmask;
  47     ret->pic->refcount ++;
  48     return ret;
  49 }
  50
  51 void avfilter_unref_pic(AVFilterPicRef *ref)
  52 {
  53     if(!(--ref->pic->refcount))
  54         ref->pic->free(ref->pic);
  55     av_free(ref);
  56 }
  57
  58 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
  59                          AVFilterPad **pads, AVFilterLink ***links,
  60                          AVFilterPad *newpad)
  61 {
  62     unsigned i;
  63
  64     idx = FFMIN(idx, *count);
  65
  66     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
  67     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
  68     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
  69     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
  70     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
  71     (*links)[idx] = NULL;
  72
  73     (*count) ++;
  74     for(i = idx+1; i < *count; i ++)
  75         if(*links[i])
  76             (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
  77 }
  78
  79 int avfilter_link(AVFilterContext *src, unsigned srcpad,
  80                   AVFilterContext *dst, unsigned dstpad)
  81 {
  82     AVFilterLink *link;
  83
  84     if(src->output_count <= srcpad || dst->input_count <= dstpad ||
  85        src->outputs[srcpad]        || dst->inputs[dstpad])
  86         return -1;
  87
  88     src->outputs[srcpad] =
  89     dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
  90
  91     link->src     = src;
  92     link->dst     = dst;
  93     link->srcpad  = srcpad;
  94     link->dstpad  = dstpad;
  95     link->format  = PIX_FMT_NONE;
  96
  97     return 0;
  98 }
  99
 100 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
 101                            unsigned in, unsigned out)
 102 {
 103     av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
 104             filt->filter->name);
 105
 106     link->dst->inputs[link->dstpad] = NULL;
 107     if(avfilter_link(filt, out, link->dst, link->dstpad)) {
 108         /* failed to link output filter to new filter */
 109         link->dst->inputs[link->dstpad] = link;
 110         return -1;
 111     }
 112
 113     /* re-hookup the link to the new destination filter we inserted */
 114     link->dst = filt;
 115     link->dstpad = in;
 116     filt->inputs[in] = link;
 117
 118     /* if any information on supported colorspaces already exists on the
 119      * link, we need to preserve that */
 120     if(link->out_formats)
 121         avfilter_formats_changeref(&link->out_formats,
 122                                    &filt->outputs[out]->out_formats);
 123
 124     return 0;
 125 }
 126
 127 int avfilter_config_links(AVFilterContext *filter)
 128 {
 129     int (*config_link)(AVFilterLink *);
 130     unsigned i;
 131
 132     for(i = 0; i < filter->input_count; i ++) {
 133         AVFilterLink *link = filter->inputs[i];
 134
 135         if(!link) continue;
 136
 137         switch(link->init_state) {
 138         case AVLINK_INIT:
 139             continue;
 140         case AVLINK_STARTINIT:
 141             av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
 142             return 0;
 143         case AVLINK_UNINIT:
 144             link->init_state = AVLINK_STARTINIT;
 145
 146             if(avfilter_config_links(link->src))
 147                 return -1;
 148
 149             if(!(config_link = link_spad(link).config_props))
 150                 config_link  = avfilter_default_config_output_link;
 151             if(config_link(link))
 152                 return -1;
 153
 154             if((config_link = link_dpad(link).config_props))
 155                 if(config_link(link))
 156                     return -1;
 157
 158             link->init_state = AVLINK_INIT;
 159         }
 160     }
 161
 162     return 0;
 163 }
 164
 165 static void dprintf_picref(void *ctx, AVFilterPicRef *picref, int end)
 166 {
 167     dprintf(ctx,
 168             "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" s:%dx%d]%s",
 169             picref,
 170             picref->data    [0], picref->data    [1], picref->data    [2], picref->data    [3],
 171             picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
 172             picref->pts, picref->w, picref->h,
 173             end ? "\n" : "");
 174 }
 175
 176 static void dprintf_link(void *ctx, AVFilterLink *link, int end)
 177 {
 178     dprintf(ctx,
 179             "link[%p s:%dx%d %-16s->%-16s]%s",
 180             link, link->w, link->h,
 181             link->src ? link->src->filter->name : "",
 182             link->dst ? link->dst->filter->name : "",
 183             end ? "\n" : "");
 184 }
 185
 186 #define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)
 187
 188 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
 189 {
 190     AVFilterPicRef *ret = NULL;
 191
 192     DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d\n", perms);
 193
 194     if(link_dpad(link).get_video_buffer)
 195         ret = link_dpad(link).get_video_buffer(link, perms);
 196
 197     if(!ret)
 198         ret = avfilter_default_get_video_buffer(link, perms);
 199
 200     DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);
 201
 202     return ret;
 203 }
 204
 205 int avfilter_request_frame(AVFilterLink *link)
 206 {
 207     DPRINTF_START(NULL, request_frame); dprintf_link(NULL, link, 1);
 208
 209     if(link_spad(link).request_frame)
 210         return link_spad(link).request_frame(link);
 211     else if(link->src->inputs[0])
 212         return avfilter_request_frame(link->src->inputs[0]);
 213     else return -1;
 214 }
 215
 216 int avfilter_poll_frame(AVFilterLink *link)
 217 {
 218     int i, min=INT_MAX;
 219
 220     if(link_spad(link).poll_frame)
 221         return link_spad(link).poll_frame(link);
 222
 223     for (i=0; i<link->src->input_count; i++) {
 224         if(!link->src->inputs[i])
 225             return -1;
 226         min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
 227     }
 228
 229     return min;
 230 }
 231
 232 /* XXX: should we do the duplicating of the picture ref here, instead of
 233  * forcing the source filter to do it? */
 234 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 235 {
 236     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
 237     AVFilterPad *dst = &link_dpad(link);
 238
 239     DPRINTF_START(NULL, start_frame); dprintf_link(NULL, link, 0); dprintf(NULL, " "); dprintf_picref(NULL, picref, 1);
 240
 241     if(!(start_frame = dst->start_frame))
 242         start_frame = avfilter_default_start_frame;
 243
 244     /* prepare to copy the picture if it has insufficient permissions */
 245     if((dst->min_perms & picref->perms) != dst->min_perms ||
 246         dst->rej_perms & picref->perms) {
 247         /*
 248         av_log(link->dst, AV_LOG_INFO,
 249                 "frame copy needed (have perms %x, need %x, reject %x)\n",
 250                 picref->perms,
 251                 link_dpad(link).min_perms, link_dpad(link).rej_perms);
 252         */
 253
 254         link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
 255         link->srcpic = picref;
 256         link->cur_pic->pts = link->srcpic->pts;
 257         link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;
 258     }
 259     else
 260         link->cur_pic = picref;
 261
 262     start_frame(link, link->cur_pic);
 263 }
 264
 265 void avfilter_end_frame(AVFilterLink *link)
 266 {
 267     void (*end_frame)(AVFilterLink *);
 268
 269     if(!(end_frame = link_dpad(link).end_frame))
 270         end_frame = avfilter_default_end_frame;
 271
 272     end_frame(link);
 273
 274     /* unreference the source picture if we're feeding the destination filter
 275      * a copied version dues to permission issues */
 276     if(link->srcpic) {
 277         avfilter_unref_pic(link->srcpic);
 278         link->srcpic = NULL;
 279     }
 280
 281 }
 282
 283 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
 284 {
 285     uint8_t *src[4], *dst[4];
 286     int i, j, hsub, vsub;
 287     void (*draw_slice)(AVFilterLink *, int, int);
 288
 289     DPRINTF_START(NULL, draw_slice); dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d\n", y, h);
 290
 291     /* copy the slice if needed for permission reasons */
 292     if(link->srcpic) {
 293         avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
 294
 295         for(i = 0; i < 4; i ++) {
 296             if(link->srcpic->data[i]) {
 297                 src[i] = link->srcpic-> data[i] +
 298                     (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
 299                 dst[i] = link->cur_pic->data[i] +
 300                     (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
 301             } else
 302                 src[i] = dst[i] = NULL;
 303         }
 304
 305         for(i = 0; i < 4; i ++) {
 306             int planew =
 307                 ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
 308
 309             if(!src[i]) continue;
 310
 311             for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
 312                 memcpy(dst[i], src[i], planew);
 313                 src[i] += link->srcpic ->linesize[i];
 314                 dst[i] += link->cur_pic->linesize[i];
 315             }
 316         }
 317     }
 318
 319     if(!(draw_slice = link_dpad(link).draw_slice))
 320         draw_slice = avfilter_default_draw_slice;
 321     draw_slice(link, y, h);
 322 }
 323
 324 AVFilter *avfilter_get_by_name(const char *name)
 325 {
 326     struct FilterList *filt;
 327
 328     for(filt = filters; filt; filt = filt->next)
 329         if(!strcmp(filt->filter->name, name))
 330             return filt->filter;
 331
 332     return NULL;
 333 }
 334
 335 void avfilter_register(AVFilter *filter)
 336 {
 337     struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
 338
 339     newfilt->filter = filter;
 340     newfilt->next   = filters;
 341     filters         = newfilt;
 342 }
 343
 344 void avfilter_uninit(void)
 345 {
 346     struct FilterList *tmp;
 347
 348     for(; filters; filters = tmp) {
 349         tmp = filters->next;
 350         av_free(filters);
 351     }
 352 }
 353
 354 static int pad_count(const AVFilterPad *pads)
 355 {
 356     int count;
 357
 358     for(count = 0; pads->name; count ++) pads ++;
 359     return count;
 360 }
 361
 362 static const char *filter_name(void *p)
 363 {
 364     AVFilterContext *filter = p;
 365     return filter->filter->name;
 366 }
 367
 368 static const AVClass avfilter_class = {
 369     "AVFilter",
 370     filter_name
 371 };
 372
 373 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
 374 {
 375     AVFilterContext *ret;
 376
 377     if (!filter)
 378         return 0;
 379
 380     ret = av_mallocz(sizeof(AVFilterContext));
 381
 382     ret->av_class = &avfilter_class;
 383     ret->filter   = filter;
 384     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 385     ret->priv     = av_mallocz(filter->priv_size);
 386
 387     ret->input_count  = pad_count(filter->inputs);
 388     if (ret->input_count) {
 389         ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
 390         memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
 391         ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
 392     }
 393
 394     ret->output_count = pad_count(filter->outputs);
 395     if (ret->output_count) {
 396         ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
 397         memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
 398         ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
 399     }
 400
 401     return ret;
 402 }
 403
 404 void avfilter_destroy(AVFilterContext *filter)
 405 {
 406     int i;
 407
 408     if(filter->filter->uninit)
 409         filter->filter->uninit(filter);
 410
 411     for(i = 0; i < filter->input_count; i ++) {
 412         if(filter->inputs[i])
 413             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
 414         av_freep(&filter->inputs[i]);
 415     }
 416     for(i = 0; i < filter->output_count; i ++) {
 417         if(filter->outputs[i])
 418             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
 419         av_freep(&filter->outputs[i]);
 420     }
 421
 422     av_freep(&filter->name);
 423     av_freep(&filter->input_pads);
 424     av_freep(&filter->output_pads);
 425     av_freep(&filter->inputs);
 426     av_freep(&filter->outputs);
 427     av_freep(&filter->priv);
 428     av_free(filter);
 429 }
 430
 431 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 432 {
 433     int ret=0;
 434
 435     if(filter->filter->init)
 436         ret = filter->filter->init(filter, args, opaque);
 437     return ret;
 438 }
 439