Revision dd08b83c

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doc/libavfilter.texi
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./ffmpeg -i in.avi -vfilters "vflip" out.avi
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@end example
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@chapter Available video sources
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Below is a description of the currently available video sources.
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@section nullsrc
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Null video source, never return images. It is mainly useful as a
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template and to be employed in analysis / debugging tools.
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It accepts as optional parameter a string of the form
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``width:height'', where ``width'' and ``height'' specify the size of
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the configured source.
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The default values of ``width'' and ``height'' are respectively 352
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and 288 (corresponding to the CIF size format).
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@bye
libavfilter/Makefile
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OBJS-$(CONFIG_SLICIFY_FILTER)                += vf_slicify.o
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OBJS-$(CONFIG_VFLIP_FILTER)                  += vf_vflip.o
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OBJS-$(CONFIG_NULLSRC_FILTER)                += vsrc_nullsrc.o
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include $(SUBDIR)../subdir.mak
libavfilter/allfilters.c
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    REGISTER_FILTER (SCALE, scale, vf);
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    REGISTER_FILTER (SLICIFY, slicify, vf);
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    REGISTER_FILTER (VFLIP, vflip, vf);
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    REGISTER_FILTER (NULLSRC, nullsrc, vsrc);
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}
libavfilter/avfilter.h
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR  1
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#define LIBAVFILTER_VERSION_MINOR 15
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#define LIBAVFILTER_VERSION_MINOR 16
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#define LIBAVFILTER_VERSION_MICRO  0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
libavfilter/vsrc_nullsrc.c
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/*
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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 libavfilter/vsrc_nullsrc.c
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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 -1;
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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 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            = CODEC_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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