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, sorted by name */
  31 static int filter_count = 0;
  32 static AVFilter **filters = NULL;
  33
  34 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
  35 {
  36     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
  37     memcpy(ret, ref, sizeof(AVFilterPicRef));
  38     ret->perms &= pmask;
  39     ret->pic->refcount ++;
  40     return ret;
  41 }
  42
  43 void avfilter_unref_pic(AVFilterPicRef *ref)
  44 {
  45     if(-- ref->pic->refcount == 0)
  46         ref->pic->free(ref->pic);
  47     av_free(ref);
  48 }
  49
  50 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
  51                          AVFilterPad **pads, AVFilterLink ***links,
  52                          AVFilterPad *newpad)
  53 {
  54     unsigned i;
  55
  56     idx = FFMIN(idx, *count);
  57
  58     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
  59     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
  60     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
  61     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
  62     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
  63     (*links)[idx] = NULL;
  64
  65     (*count) ++;
  66     for(i = idx+1; i < *count; i ++)
  67         if(*links[i])
  68             (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
  69 }
  70
  71 int avfilter_link(AVFilterContext *src, unsigned srcpad,
  72                   AVFilterContext *dst, unsigned dstpad)
  73 {
  74     AVFilterLink *link;
  75
  76     if(src->output_count <= srcpad || dst->input_count <= dstpad ||
  77        src->outputs[srcpad]        || dst->inputs[dstpad])
  78         return -1;
  79
  80     src->outputs[srcpad] =
  81     dst->inputs[dstpad]  = link = av_malloc(sizeof(AVFilterLink));
  82
  83     link->src     = src;
  84     link->dst     = dst;
  85     link->srcpad  = srcpad;
  86     link->dstpad  = dstpad;
  87     link->cur_pic = NULL;
  88     link->format  = -1;
  89
  90     return 0;
  91 }
  92
  93 int avfilter_config_link(AVFilterLink *link)
  94 {
  95     int *fmts[2], i, j;
  96     int (*config_link)(AVFilterLink *);
  97
  98     if(!link)
  99         return 0;
 100
 101     /* find a format both filters support - TODO: auto-insert conversion filter */
 102     link->format = -1;
 103     if(link->src->output_pads[link->srcpad].query_formats)
 104         fmts[0] = link->src->output_pads[link->srcpad].query_formats(link);
 105     else
 106         fmts[0] = avfilter_default_query_output_formats(link);
 107     fmts[1] = link->dst->input_pads[link->dstpad].query_formats(link);
 108     for(i = 0; fmts[0][i] != -1; i ++)
 109         for(j = 0; fmts[1][j] != -1; j ++)
 110             if(fmts[0][i] == fmts[1][j]) {
 111                 link->format = fmts[0][i];
 112                 goto format_done;
 113             }
 114
 115 format_done:
 116     av_free(fmts[0]);
 117     av_free(fmts[1]);
 118     if(link->format == -1)
 119         return -1;
 120
 121     if(!(config_link = link->src->output_pads[link->srcpad].config_props))
 122         config_link  = avfilter_default_config_output_link;
 123     if(config_link(link))
 124             return -1;
 125
 126     if(!(config_link = link->dst->input_pads[link->dstpad].config_props))
 127         config_link  = avfilter_default_config_input_link;
 128     if(config_link(link))
 129             return -1;
 130
 131     return 0;
 132 }
 133
 134 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
 135 {
 136     AVFilterPicRef *ret = NULL;
 137
 138     if(link->dst->input_pads[link->dstpad].get_video_buffer)
 139         ret = link->dst->input_pads[link->dstpad].get_video_buffer(link, perms);
 140
 141     if(!ret)
 142         ret = avfilter_default_get_video_buffer(link, perms);
 143
 144     return ret;
 145 }
 146
 147 void avfilter_request_frame(AVFilterLink *link)
 148 {
 149     const AVFilterPad *pad = &link->src->output_pads[link->srcpad];
 150
 151     if(pad->request_frame)
 152         pad->request_frame(link);
 153     else if(link->src->inputs[0])
 154         avfilter_request_frame(link->src->inputs[0]);
 155 }
 156
 157 /* XXX: should we do the duplicating of the picture ref here, instead of
 158  * forcing the source filter to do it? */
 159 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 160 {
 161     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
 162
 163     start_frame = link->dst->input_pads[link->dstpad].start_frame;
 164     if(!start_frame)
 165         start_frame = avfilter_default_start_frame;
 166
 167     start_frame(link, picref);
 168 }
 169
 170 void avfilter_end_frame(AVFilterLink *link)
 171 {
 172     void (*end_frame)(AVFilterLink *);
 173
 174     end_frame = link->dst->input_pads[link->dstpad].end_frame;
 175     if(!end_frame)
 176         end_frame = avfilter_default_end_frame;
 177
 178     end_frame(link);
 179 }
 180
 181 void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
 182 {
 183     if(!link->dst->input_pads[link->dstpad].draw_slice)
 184         return;
 185
 186     link->dst->input_pads[link->dstpad].draw_slice(link, data, y, h);
 187 }
 188
 189 static int filter_cmp(const void *aa, const void *bb)
 190 {
 191     const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
 192     return strcmp(a->name, b->name);
 193 }
 194
 195 AVFilter *avfilter_get_by_name(char *name)
 196 {
 197     AVFilter key = { .name = name, };
 198     AVFilter *key2 = &key;
 199     AVFilter **ret;
 200
 201     ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
 202     if(ret)
 203         return *ret;
 204     return NULL;
 205 }
 206
 207 /* FIXME: insert in order, rather than insert at end + resort */
 208 void avfilter_register(AVFilter *filter)
 209 {
 210     filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
 211     filters[filter_count] = filter;
 212     qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
 213 }
 214
 215 void avfilter_init(void)
 216 {
 217     avfilter_register(&vsrc_dummy);
 218     avfilter_register(&vsrc_ppm);
 219     avfilter_register(&vf_crop);
 220     avfilter_register(&vf_graph);
 221     avfilter_register(&vf_passthrough);
 222     avfilter_register(&vf_rgb2bgr);
 223     avfilter_register(&vf_slicify);
 224     avfilter_register(&vo_sdl);
 225 }
 226
 227 void avfilter_uninit(void)
 228 {
 229     av_freep(&filters);
 230     filter_count = 0;
 231 }
 232
 233 static int pad_count(const AVFilterPad *pads)
 234 {
 235     AVFilterPad *p = (AVFilterPad *) pads;
 236     int count;
 237
 238     for(count = 0; p->name; count ++) p ++;
 239     return count;
 240 }
 241
 242 static const char *filter_name(void *p)
 243 {
 244     AVFilterContext *filter = p;
 245     return filter->filter->name;
 246 }
 247
 248 AVFilterContext *avfilter_create(AVFilter *filter, char *inst_name)
 249 {
 250     AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
 251
 252     ret->av_class = av_mallocz(sizeof(AVClass));
 253     ret->av_class->item_name = filter_name;
 254     ret->filter   = filter;
 255     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 256     ret->priv     = av_mallocz(filter->priv_size);
 257
 258     ret->input_count  = pad_count(filter->inputs);
 259     ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
 260     memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
 261     ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
 262
 263     ret->output_count = pad_count(filter->outputs);
 264     ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
 265     memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
 266     ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
 267
 268     return ret;
 269 }
 270
 271 void avfilter_destroy(AVFilterContext *filter)
 272 {
 273     int i;
 274
 275     if(filter->filter->uninit)
 276         filter->filter->uninit(filter);
 277
 278     for(i = 0; i < filter->input_count; i ++) {
 279         if(filter->inputs[i])
 280             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
 281         av_free(filter->inputs[i]);
 282     }
 283     for(i = 0; i < filter->output_count; i ++) {
 284         if(filter->outputs[i])
 285             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
 286         av_free(filter->outputs[i]);
 287     }
 288
 289     av_free(filter->name);
 290     av_free(filter->input_pads);
 291     av_free(filter->output_pads);
 292     av_free(filter->inputs);
 293     av_free(filter->outputs);
 294     av_free(filter->priv);
 295     av_free(filter->av_class);
 296     av_free(filter);
 297 }
 298
 299 AVFilterContext *avfilter_create_by_name(char *name, char *inst_name)
 300 {
 301     AVFilter *filt;
 302
 303     if(!(filt = avfilter_get_by_name(name))) return NULL;
 304     return avfilter_create(filt, inst_name);
 305 }
 306
 307 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 308 {
 309     int ret;
 310
 311     if(filter->filter->init)
 312         if((ret = filter->filter->init(filter, args, opaque))) return ret;
 313     return 0;
 314 }
 315
 316 int *avfilter_make_format_list(int len, ...)
 317 {
 318     int *ret, i;
 319     va_list vl;
 320
 321     ret = av_malloc(sizeof(int) * (len + 1));
 322     va_start(vl, len);
 323     for(i = 0; i < len; i ++)
 324         ret[i] = va_arg(vl, int);
 325     va_end(vl);
 326     ret[len] = -1;
 327
 328     return ret;
 329 }
 330