2 * This file is part of FFmpeg.
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.
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.
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
30 static int init(AVFilterContext *ctx, const char *args, void *opaque)
32 NullContext *priv = ctx->priv;
38 sscanf(args, "%d:%d", &priv->w, &priv->h);
40 if (priv->w <= 0 || priv->h <= 0) {
41 av_log(ctx, AV_LOG_ERROR, "Non-positive size values are not acceptable.\n");
48 static int config_props(AVFilterLink *outlink)
50 NullContext *priv = outlink->src->priv;
55 av_log(outlink->src, AV_LOG_INFO, "w:%d h:%d\n", priv->w, priv->h);
60 static int request_frame(AVFilterLink *link)
65 AVFilter avfilter_vsrc_nullsrc = {
67 .description = "Null video source, never return images.",
70 .priv_size = sizeof(NullContext),
72 .inputs = (AVFilterPad[]) {{ .name = NULL}},
74 .outputs = (AVFilterPad[]) {
77 .type = AVMEDIA_TYPE_VIDEO,
78 .config_props = config_props,
79 .request_frame = request_frame,