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