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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
*/
/**
* @file
* null video source
*/
#include "avfilter.h"
typedef struct {
int w, h;
} NullContext;
static int init(AVFilterContext *ctx, const char *args, void *opaque)
{
NullContext *priv = ctx->priv;
priv->w = 352;
priv->h = 288;
if (args)
sscanf(args, "%d:%d", &priv->w, &priv->h);
if (priv->w <= 0 || priv->h <= 0) {
av_log(ctx, AV_LOG_ERROR, "Non-positive size values are not acceptable.\n");
return AVERROR(EINVAL);
}
return 0;
}
static int config_props(AVFilterLink *outlink)
{
NullContext *priv = outlink->src->priv;
outlink->w = priv->w;
outlink->h = priv->h;
av_log(outlink->src, AV_LOG_INFO, "w:%d h:%d\n", priv->w, priv->h);
return 0;
}
static int request_frame(AVFilterLink *link)
{
return -1;
}
AVFilter avfilter_vsrc_nullsrc = {
.name = "nullsrc",
.description = NULL_IF_CONFIG_SMALL("Null video source, never return images."),
.init = init,
.priv_size = sizeof(NullContext),
.inputs = (AVFilterPad[]) {{ .name = NULL}},
.outputs = (AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.request_frame = request_frame,
},
{ .name = NULL}
},
};
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