Implement null video source.

Originally committed as revision 21240 to svn://svn.ffmpeg.org/ffmpeg/trunk
release/0.6
Stefano Sabatini 15 years ago
parent e1bb0364f8
commit dd08b83c87
  1. 16
      doc/libavfilter.texi
  2. 2
      libavfilter/Makefile
  3. 2
      libavfilter/allfilters.c
  4. 2
      libavfilter/avfilter.h
  5. 83
      libavfilter/vsrc_nullsrc.c

@ -197,4 +197,20 @@ Flip the input video vertically.
./ffmpeg -i in.avi -vfilters "vflip" out.avi
@end example
@chapter Available video sources
Below is a description of the currently available video sources.
@section nullsrc
Null video source, never return images. It is mainly useful as a
template and to be employed in analysis / debugging tools.
It accepts as optional parameter a string of the form
``width:height'', where ``width'' and ``height'' specify the size of
the configured source.
The default values of ``width'' and ``height'' are respectively 352
and 288 (corresponding to the CIF size format).
@bye

@ -20,4 +20,6 @@ OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o
OBJS-$(CONFIG_NULLSRC_FILTER) += vsrc_nullsrc.o
include $(SUBDIR)../subdir.mak

@ -41,4 +41,6 @@ void avfilter_register_all(void)
REGISTER_FILTER (SCALE, scale, vf);
REGISTER_FILTER (SLICIFY, slicify, vf);
REGISTER_FILTER (VFLIP, vflip, vf);
REGISTER_FILTER (NULLSRC, nullsrc, vsrc);
}

@ -25,7 +25,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 15
#define LIBAVFILTER_VERSION_MINOR 16
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

@ -0,0 +1,83 @@
/*
* 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 libavfilter/vsrc_nullsrc.c
* 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 -1;
}
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 video source, never return images.",
.init = init,
.priv_size = sizeof(NullContext),
.inputs = (AVFilterPad[]) {{ .name = NULL}},
.outputs = (AVFilterPad[]) {
{
.name = "default",
.type = CODEC_TYPE_VIDEO,
.config_props = config_props,
.request_frame = request_frame,
},
{ .name = NULL}
},
};
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