libavfilter/vf_null.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /**
  20  * @file libavfilter/vf_null.c
  21  * null filter
  22  */
  23
  24 #include "avfilter.h"
  25
  26 static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
  27 {
  28     return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
  29 }
  30
  31 static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
  32 {
  33     avfilter_start_frame(link->dst->outputs[0], picref);
  34 }
  35
  36 static void end_frame(AVFilterLink *link)
  37 {
  38     avfilter_end_frame(link->dst->outputs[0]);
  39 }
  40
  41 AVFilter avfilter_vf_null = {
  42     .name      = "null",
  43
  44     .priv_size = 0,
  45
  46     .inputs    = (AVFilterPad[]) {{ .name             = "default",
  47                                     .type             = CODEC_TYPE_VIDEO,
  48                                     .get_video_buffer = get_video_buffer,
  49                                     .start_frame      = start_frame,
  50                                     .end_frame        = end_frame },
  51                                   { .name = NULL}},
  52
  53     .outputs   = (AVFilterPad[]) {{ .name             = "default",
  54                                     .type             = CODEC_TYPE_VIDEO, },
  55                                   { .name = NULL}},
  56 };