lavfi: add split filter from soc.

Some fixes by Stefano.
For detailed authorship see SOC repo

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Changelog

@@ -44,6 +44,7 @@ easier to use. The changes are:
 - Windows Media Image decoder
 - LATM muxer
 - showinfo filter
+- split filter
 
 
 version 0.7:

libavfilter/Makefile

@@ -46,6 +46,7 @@ OBJS-$(CONFIG_SETSAR_FILTER)                 += vf_aspect.o
 OBJS-$(CONFIG_SETTB_FILTER)                  += vf_settb.o
 OBJS-$(CONFIG_SHOWINFO_FILTER)               += vf_showinfo.o
 OBJS-$(CONFIG_SLICIFY_FILTER)                += vf_slicify.o
+OBJS-$(CONFIG_SPLIT_FILTER)                  += vf_split.o
 OBJS-$(CONFIG_TRANSPOSE_FILTER)              += vf_transpose.o
 OBJS-$(CONFIG_UNSHARP_FILTER)                += vf_unsharp.o
 OBJS-$(CONFIG_VFLIP_FILTER)                  += vf_vflip.o

libavfilter/allfilters.c

@@ -67,6 +67,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER (SETTB,       settb,       vf);
     REGISTER_FILTER (SHOWINFO,    showinfo,    vf);
     REGISTER_FILTER (SLICIFY,     slicify,     vf);
+    REGISTER_FILTER (SPLIT,       split,       vf);
     REGISTER_FILTER (TRANSPOSE,   transpose,   vf);
     REGISTER_FILTER (UNSHARP,     unsharp,     vf);
     REGISTER_FILTER (VFLIP,       vflip,       vf);

libavfilter/avfilter.h

@@ -29,7 +29,7 @@
 #include "libavutil/rational.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR  5
+#define LIBAVFILTER_VERSION_MINOR  6
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_split.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2007 Bobby Bingham
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Video splitter
+ */
+
+#include "avfilter.h"
+
+static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+{
+    avfilter_start_frame(inlink->dst->outputs[0],
+                         avfilter_ref_buffer(picref, ~AV_PERM_WRITE));
+    avfilter_start_frame(inlink->dst->outputs[1],
+                         avfilter_ref_buffer(picref, ~AV_PERM_WRITE));
+}
+
+static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    avfilter_draw_slice(inlink->dst->outputs[1], y, h, slice_dir);
+}
+
+static void end_frame(AVFilterLink *inlink)
+{
+    avfilter_end_frame(inlink->dst->outputs[0]);
+    avfilter_end_frame(inlink->dst->outputs[1]);
+
+    avfilter_unref_buffer(inlink->cur_buf);
+}
+
+AVFilter avfilter_vf_split = {
+    .name      = "split",
+    .description = NULL_IF_CONFIG_SMALL("Pass on the input to two outputs."),
+
+    .inputs    = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AVMEDIA_TYPE_VIDEO,
+                                    .get_video_buffer= avfilter_null_get_video_buffer,
+                                    .start_frame     = start_frame,
+                                    .draw_slice      = draw_slice,
+                                    .end_frame       = end_frame, },
+                                  { .name = NULL}},
+    .outputs   = (AVFilterPad[]) {{ .name            = "output1",
+                                    .type            = AVMEDIA_TYPE_VIDEO, },
+                                  { .name            = "output2",
+                                    .type            = AVMEDIA_TYPE_VIDEO, },
+                                  { .name = NULL}},
+};