84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* null video source
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*/
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#include "avfilter.h"
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typedef struct {
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int w, h;
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} NullContext;
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static int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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NullContext *priv = ctx->priv;
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priv->w = 352;
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priv->h = 288;
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if (args)
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sscanf(args, "%d:%d", &priv->w, &priv->h);
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if (priv->w <= 0 || priv->h <= 0) {
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av_log(ctx, AV_LOG_ERROR, "Non-positive size values are not acceptable.\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int config_props(AVFilterLink *outlink)
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{
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NullContext *priv = outlink->src->priv;
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outlink->w = priv->w;
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outlink->h = priv->h;
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av_log(outlink->src, AV_LOG_INFO, "w:%d h:%d\n", priv->w, priv->h);
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return 0;
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}
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static int request_frame(AVFilterLink *link)
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{
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return -1;
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}
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AVFilter avfilter_vsrc_nullsrc = {
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.name = "nullsrc",
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.description = NULL_IF_CONFIG_SMALL("Null video source, never return images."),
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.init = init,
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.priv_size = sizeof(NullContext),
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.inputs = (AVFilterPad[]) {{ .name = NULL}},
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.outputs = (AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props,
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.request_frame = request_frame,
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},
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{ .name = NULL}
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},
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};
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