From 7b018b1d7da7ff68310de8735772cdb2f044888d Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date: Sun, 18 Oct 2009 09:44:33 +0000
Subject: [PATCH] Add the null video filter.
Originally committed as revision 20275 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
doc/vfilters.texi | 4 +++
libavfilter/Makefile | 2 +-
libavfilter/allfilters.c | 3 +--
libavfilter/vf_null.c | 56 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 62 insertions(+), 3 deletions(-)
create mode 100644 libavfilter/vf_null.c
diff --git a/doc/vfilters.texi b/doc/vfilters.texi
index 9f20d464e44..45766cce092 100644
--- a/doc/vfilters.texi
+++ b/doc/vfilters.texi
@@ -78,4 +78,8 @@ build.
Below is a description of the currently available video filters.
+@section null
+
+Pass the source unchanged to the output.
+
@bye
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index ccf7909c0b3..e79eb47da42 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -11,6 +11,6 @@ OBJS = allfilters.o \
defaults.o \
formats.o \
-#OBJS-$(CONFIG_XXX_FILTER) += vf_xxx.o
+OBJS-$(CONFIG_NULL_FILTER) += vf_null.o
include $(SUBDIR)../subdir.mak
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index dff61142f4e..f8188852bb9 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -34,6 +34,5 @@ void avfilter_register_all(void)
return;
initialized = 1;
-// REGISTER_FILTER (CROP,crop,vf);
-
+ REGISTER_FILTER (NULL,null,vf);
}
diff --git a/libavfilter/vf_null.c b/libavfilter/vf_null.c
new file mode 100644
index 00000000000..ad4095fb6d0
--- /dev/null
+++ b/libavfilter/vf_null.c
@@ -0,0 +1,56 @@
+/*
+ * 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/vf_null.c
+ * null filter
+ */
+
+#include "avfilter.h"
+
+static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
+{
+ return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
+}
+
+static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+{
+ avfilter_start_frame(link->dst->outputs[0], picref);
+}
+
+static void end_frame(AVFilterLink *link)
+{
+ avfilter_end_frame(link->dst->outputs[0]);
+}
+
+AVFilter avfilter_vf_null = {
+ .name = "null",
+
+ .priv_size = 0,
+
+ .inputs = (AVFilterPad[]) {{ .name = "default",
+ .type = CODEC_TYPE_VIDEO,
+ .get_video_buffer = get_video_buffer,
+ .start_frame = start_frame,
+ .end_frame = end_frame },
+ { .name = NULL}},
+
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = CODEC_TYPE_VIDEO, },
+ { .name = NULL}},
+};
--
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