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 const char * avfilter_configuration(void)
  32 {
  33     return FFMPEG_CONFIGURATION;
  34 }
  35
  36 const char * avfilter_license(void)
  37 {
  38 #define LICENSE_PREFIX "libavfilter license: "
  39     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
  40 }
  41
  42 /** helper macros to get the in/out pad on the dst/src filter */
  43 #define link_dpad(link)     link->dst-> input_pads[link->dstpad]
  44 #define link_spad(link)     link->src->output_pads[link->srcpad]
  45
  46 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
  47 {
  48     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
  49     *ret = *ref;
  50     ret->perms &= pmask;
  51     ret->pic->refcount ++;
  52     return ret;
  53 }
  54
  55 void avfilter_unref_pic(AVFilterPicRef *ref)
  56 {
  57     if(!(--ref->pic->refcount))
  58         ref->pic->free(ref->pic);
  59     av_free(ref);
  60 }
  61
  62 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
  63                          AVFilterPad **pads, AVFilterLink ***links,
  64                          AVFilterPad *newpad)
  65 {
  66     unsigned i;
  67
  68     idx = FFMIN(idx, *count);
  69
  70     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
  71     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
  72     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
  73     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
  74     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
  75     (*links)[idx] = NULL;
  76
  77     (*count) ++;
  78     for(i = idx+1; i < *count; i ++)
  79         if(*links[i])
  80             (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
  81 }
  82
  83 int avfilter_link(AVFilterContext *src, unsigned srcpad,
  84                   AVFilterContext *dst, unsigned dstpad)
  85 {
  86     AVFilterLink *link;
  87
  88     if(src->output_count <= srcpad || dst->input_count <= dstpad ||
  89        src->outputs[srcpad]        || dst->inputs[dstpad])
  90         return -1;
  91
  92     src->outputs[srcpad] =
  93     dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
  94
  95     link->src     = src;
  96     link->dst     = dst;
  97     link->srcpad  = srcpad;
  98     link->dstpad  = dstpad;
  99     link->format  = PIX_FMT_NONE;
 100
 101     return 0;
 102 }
 103
 104 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
 105                            unsigned in, unsigned out)
 106 {
 107     av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
 108             filt->filter->name);
 109
 110     link->dst->inputs[link->dstpad] = NULL;
 111     if(avfilter_link(filt, out, link->dst, link->dstpad)) {
 112         /* failed to link output filter to new filter */
 113         link->dst->inputs[link->dstpad] = link;
 114         return -1;
 115     }
 116
 117     /* re-hookup the link to the new destination filter we inserted */
 118     link->dst = filt;
 119     link->dstpad = in;
 120     filt->inputs[in] = link;
 121
 122     /* if any information on supported colorspaces already exists on the
 123      * link, we need to preserve that */
 124     if(link->out_formats)
 125         avfilter_formats_changeref(&link->out_formats,
 126                                    &filt->outputs[out]->out_formats);
 127
 128     return 0;
 129 }
 130
 131 int avfilter_config_links(AVFilterContext *filter)
 132 {
 133     int (*config_link)(AVFilterLink *);
 134     unsigned i;
 135
 136     for(i = 0; i < filter->input_count; i ++) {
 137         AVFilterLink *link = filter->inputs[i];
 138
 139         if(!link) continue;
 140
 141         switch(link->init_state) {
 142         case AVLINK_INIT:
 143             continue;
 144         case AVLINK_STARTINIT:
 145             av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
 146             return 0;
 147         case AVLINK_UNINIT:
 148             link->init_state = AVLINK_STARTINIT;
 149
 150             if(avfilter_config_links(link->src))
 151                 return -1;
 152
 153             if(!(config_link = link_spad(link).config_props))
 154                 config_link  = avfilter_default_config_output_link;
 155             if(config_link(link))
 156                 return -1;
 157
 158             if((config_link = link_dpad(link).config_props))
 159                 if(config_link(link))
 160                     return -1;
 161
 162             link->init_state = AVLINK_INIT;
 163         }
 164     }
 165
 166     return 0;
 167 }
 168
 169 static void dprintf_picref(void *ctx, AVFilterPicRef *picref, int end)
 170 {
 171     dprintf(ctx,
 172             "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" s:%dx%d]%s",
 173             picref,
 174             picref->data    [0], picref->data    [1], picref->data    [2], picref->data    [3],
 175             picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
 176             picref->pts, picref->w, picref->h,
 177             end ? "\n" : "");
 178 }
 179
 180 static void dprintf_link(void *ctx, AVFilterLink *link, int end)
 181 {
 182     dprintf(ctx,
 183             "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
 184             link, link->w, link->h,
 185             avcodec_get_pix_fmt_name(link->format),
 186             link->src ? link->src->filter->name : "",
 187             link->dst ? link->dst->filter->name : "",
 188             end ? "\n" : "");
 189 }
 190
 191 #define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)
 192
 193 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
 194 {
 195     AVFilterPicRef *ret = NULL;
 196
 197     DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
 198
 199     if(link_dpad(link).get_video_buffer)
 200         ret = link_dpad(link).get_video_buffer(link, perms, w, h);
 201
 202     if(!ret)
 203         ret = avfilter_default_get_video_buffer(link, perms, w, h);
 204
 205     DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);
 206
 207     return ret;
 208 }
 209
 210 int avfilter_request_frame(AVFilterLink *link)
 211 {
 212     DPRINTF_START(NULL, request_frame); dprintf_link(NULL, link, 1);
 213
 214     if(link_spad(link).request_frame)
 215         return link_spad(link).request_frame(link);
 216     else if(link->src->inputs[0])
 217         return avfilter_request_frame(link->src->inputs[0]);
 218     else return -1;
 219 }
 220
 221 int avfilter_poll_frame(AVFilterLink *link)
 222 {
 223     int i, min=INT_MAX;
 224
 225     if(link_spad(link).poll_frame)
 226         return link_spad(link).poll_frame(link);
 227
 228     for (i=0; i<link->src->input_count; i++) {
 229         int val;
 230         if(!link->src->inputs[i])
 231             return -1;
 232         val = avfilter_poll_frame(link->src->inputs[i]);
 233         min = FFMIN(min, val);
 234     }
 235
 236     return min;
 237 }
 238
 239 /* XXX: should we do the duplicating of the picture ref here, instead of
 240  * forcing the source filter to do it? */
 241 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 242 {
 243     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
 244     AVFilterPad *dst = &link_dpad(link);
 245
 246     DPRINTF_START(NULL, start_frame); dprintf_link(NULL, link, 0); dprintf(NULL, " "); dprintf_picref(NULL, picref, 1);
 247
 248     if(!(start_frame = dst->start_frame))
 249         start_frame = avfilter_default_start_frame;
 250
 251     /* prepare to copy the picture if it has insufficient permissions */
 252     if((dst->min_perms & picref->perms) != dst->min_perms ||
 253         dst->rej_perms & picref->perms) {
 254         /*
 255         av_log(link->dst, AV_LOG_INFO,
 256                 "frame copy needed (have perms %x, need %x, reject %x)\n",
 257                 picref->perms,
 258                 link_dpad(link).min_perms, link_dpad(link).rej_perms);
 259         */
 260
 261         link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
 262         link->srcpic = picref;
 263         link->cur_pic->pts = link->srcpic->pts;
 264         link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;
 265     }
 266     else
 267         link->cur_pic = picref;
 268
 269     start_frame(link, link->cur_pic);
 270 }
 271
 272 void avfilter_end_frame(AVFilterLink *link)
 273 {
 274     void (*end_frame)(AVFilterLink *);
 275
 276     if(!(end_frame = link_dpad(link).end_frame))
 277         end_frame = avfilter_default_end_frame;
 278
 279     end_frame(link);
 280
 281     /* unreference the source picture if we're feeding the destination filter
 282      * a copied version dues to permission issues */
 283     if(link->srcpic) {
 284         avfilter_unref_pic(link->srcpic);
 285         link->srcpic = NULL;
 286     }
 287
 288 }
 289
 290 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 291 {
 292     uint8_t *src[4], *dst[4];
 293     int i, j, hsub, vsub;
 294     void (*draw_slice)(AVFilterLink *, int, int, int);
 295
 296     DPRINTF_START(NULL, draw_slice); dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
 297
 298     /* copy the slice if needed for permission reasons */
 299     if(link->srcpic) {
 300         avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
 301
 302         for(i = 0; i < 4; i ++) {
 303             if(link->srcpic->data[i]) {
 304                 src[i] = link->srcpic-> data[i] +
 305                     (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
 306                 dst[i] = link->cur_pic->data[i] +
 307                     (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
 308             } else
 309                 src[i] = dst[i] = NULL;
 310         }
 311
 312         for(i = 0; i < 4; i ++) {
 313             int planew =
 314                 ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
 315
 316             if(!src[i]) continue;
 317
 318             for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
 319                 memcpy(dst[i], src[i], planew);
 320                 src[i] += link->srcpic ->linesize[i];
 321                 dst[i] += link->cur_pic->linesize[i];
 322             }
 323         }
 324     }
 325
 326     if(!(draw_slice = link_dpad(link).draw_slice))
 327         draw_slice = avfilter_default_draw_slice;
 328     draw_slice(link, y, h, slice_dir);
 329 }
 330
 331 #define MAX_REGISTERED_AVFILTERS_NB 64
 332
 333 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
 334
 335 static int next_registered_avfilter_idx = 0;
 336
 337 AVFilter *avfilter_get_by_name(const char *name)
 338 {
 339     int i;
 340
 341     for (i = 0; registered_avfilters[i]; i++)
 342         if (!strcmp(registered_avfilters[i]->name, name))
 343             return registered_avfilters[i];
 344
 345     return NULL;
 346 }
 347
 348 int avfilter_register(AVFilter *filter)
 349 {
 350     if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
 351         return -1;
 352
 353     registered_avfilters[next_registered_avfilter_idx++] = filter;
 354     return 0;
 355 }
 356
 357 AVFilter **av_filter_next(AVFilter **filter)
 358 {
 359     return filter ? ++filter : &registered_avfilters[0];
 360 }
 361
 362 void avfilter_uninit(void)
 363 {
 364     memset(registered_avfilters, 0, sizeof(registered_avfilters));
 365     next_registered_avfilter_idx = 0;
 366 }
 367
 368 static int pad_count(const AVFilterPad *pads)
 369 {
 370     int count;
 371
 372     for(count = 0; pads->name; count ++) pads ++;
 373     return count;
 374 }
 375
 376 static const char *filter_name(void *p)
 377 {
 378     AVFilterContext *filter = p;
 379     return filter->filter->name;
 380 }
 381
 382 static const AVClass avfilter_class = {
 383     "AVFilter",
 384     filter_name
 385 };
 386
 387 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
 388 {
 389     AVFilterContext *ret;
 390
 391     if (!filter)
 392         return 0;
 393
 394     ret = av_mallocz(sizeof(AVFilterContext));
 395
 396     ret->av_class = &avfilter_class;
 397     ret->filter   = filter;
 398     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 399     ret->priv     = av_mallocz(filter->priv_size);
 400
 401     ret->input_count  = pad_count(filter->inputs);
 402     if (ret->input_count) {
 403         ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
 404         memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
 405         ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
 406     }
 407
 408     ret->output_count = pad_count(filter->outputs);
 409     if (ret->output_count) {
 410         ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
 411         memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
 412         ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
 413     }
 414
 415     return ret;
 416 }
 417
 418 void avfilter_destroy(AVFilterContext *filter)
 419 {
 420     int i;
 421
 422     if(filter->filter->uninit)
 423         filter->filter->uninit(filter);
 424
 425     for(i = 0; i < filter->input_count; i ++) {
 426         if(filter->inputs[i])
 427             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
 428         av_freep(&filter->inputs[i]);
 429     }
 430     for(i = 0; i < filter->output_count; i ++) {
 431         if(filter->outputs[i])
 432             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
 433         av_freep(&filter->outputs[i]);
 434     }
 435
 436     av_freep(&filter->name);
 437     av_freep(&filter->input_pads);
 438     av_freep(&filter->output_pads);
 439     av_freep(&filter->inputs);
 440     av_freep(&filter->outputs);
 441     av_freep(&filter->priv);
 442     av_free(filter);
 443 }
 444
 445 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 446 {
 447     int ret=0;
 448
 449     if(filter->filter->init)
 450         ret = filter->filter->init(filter, args, opaque);
 451     return ret;
 452 }
 453