1. ffmpeg
  2. Commit c38ae71f54f93c662c7f5ae950cc754d5d9edbf4
Browse code

Add video vertical flip filter.

Originally committed as revision 20352 to svn://svn.ffmpeg.org/ffmpeg/trunk

Stefano Sabatini authored on 2009/10/23 07:00:33
Showing 4 changed files
doc/libavfilter.texi
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@@ -115,4 +115,12 @@ The default value of ``w'' and ``h'' is 0.
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 Pass the source unchanged to the output.
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+@section vflip
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+
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+Flip the input video vertically.
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+
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+@example
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+./ffmpeg -i in.avi -vfilters "vflip" out.avi
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+@end example
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+
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 @bye
libavfilter/Makefile
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@@ -13,5 +13,6 @@ OBJS = allfilters.o                                                     \
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 OBJS-$(CONFIG_CROP_FILTER)    += vf_crop.o
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 OBJS-$(CONFIG_NULL_FILTER)    += vf_null.o
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+OBJS-$(CONFIG_VFLIP_FILTER)   += vf_vflip.o
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 include $(SUBDIR)../subdir.mak
libavfilter/allfilters.c
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@@ -36,4 +36,5 @@ void avfilter_register_all(void)
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     REGISTER_FILTER (CROP,crop,vf);
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     REGISTER_FILTER (NULL,null,vf);
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+    REGISTER_FILTER (VFLIP,vflip,vf);
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 }
libavfilter/vf_vflip.c
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new file mode 100644
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@@ -0,0 +1,102 @@
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+/*
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+ * copyright (c) 2007 Bobby Bingham
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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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+/**
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+ * @file libavfilter/vf_vflip.c
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+ * video vertical flip filter
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+ */
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+
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+#include "avfilter.h"
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+
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+typedef struct {
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+    int vsub;   ///< vertical chroma subsampling
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+} FlipContext;
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+
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+static int config_input(AVFilterLink *link)
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+{
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+    FlipContext *flip = link->dst->priv;
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+    int tmp;
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+
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+    avcodec_get_chroma_sub_sample(link->format, &tmp, &flip->vsub);
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+
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+    return 0;
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+}
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+
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+static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
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+                                        int w, int h)
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+{
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+    FlipContext *flip = link->dst->priv;
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+    int i;
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+
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+    AVFilterPicRef *picref = avfilter_get_video_buffer(link->dst->outputs[0],
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+                                                       perms, w, h);
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+
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+    picref->data[0] += (h-1) * picref->linesize[0];
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+    picref->linesize[0] = -picref->linesize[0];
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+    for (i = 1; i < 4; i ++) {
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+        if (picref->data[i]) {
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+            picref->data[i] += ((h >> flip->vsub)-1) * picref->linesize[i];
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+            picref->linesize[i] = -picref->linesize[i];
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+        }
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+    }
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+
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+    return picref;
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+}
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+
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+static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
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+{
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+    FlipContext *flip = link->dst->priv;
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+    AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
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+    int i;
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+
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+    ref2->data[0] += (link->h-1) * ref2->linesize[0];
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+    ref2->linesize[0] = -ref2->linesize[0];
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+    for (i = 1; i < 4; i ++) {
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+        if (ref2->data[i]) {
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+            ref2->data[i] += ((link->h >> flip->vsub)-1) * ref2->linesize[i];
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+            ref2->linesize[i] = -ref2->linesize[i];
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+        }
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+    }
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+
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+    avfilter_start_frame(link->dst->outputs[0], ref2);
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+}
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+
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+static void draw_slice(AVFilterLink *link, int y, int h)
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+{
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+    AVFilterContext *ctx = link->dst;
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+
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+    avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h);
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+}
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+
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+AVFilter avfilter_vf_vflip = {
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+    .name      = "vflip",
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+    .priv_size = sizeof(FlipContext),
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+
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+    .inputs    = (AVFilterPad[]) {{ .name             = "default",
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+                                    .type             = CODEC_TYPE_VIDEO,
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+                                    .get_video_buffer = get_video_buffer,
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+                                    .start_frame      = start_frame,
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+                                    .draw_slice       = draw_slice,
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+                                    .config_props     = config_input, },
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+                                  { .name = NULL}},
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+    .outputs   = (AVFilterPad[]) {{ .name             = "default",
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+                                    .type             = CODEC_TYPE_VIDEO, },
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+                                  { .name = NULL}},
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+};