libavfilter/vsink_nullsink.c
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 /*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "avfilter.h"
 
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 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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 {
 }
 
 static void end_frame(AVFilterLink *link)
 {
 }
 
 AVFilter avfilter_vsink_nullsink = {
     .name        = "nullsink",
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     .description = NULL_IF_CONFIG_SMALL("Do absolutely nothing with the input video."),
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     .priv_size = 0,
 
     .inputs    = (AVFilterPad[]) {
         {
             .name            = "default",
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             .type            = AVMEDIA_TYPE_VIDEO,
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             .start_frame     = start_frame,
             .end_frame       = end_frame,
         },
         { .name = NULL},
     },
     .outputs   = (AVFilterPad[]) {{ .name = NULL }},
 };