[FFmpeg-soc] [soc]: r1632 - in libavfilter: Makefile allfilters.h avfilter.c vf_hflip.c

[benoit]

Author: benoit
Date: Fri Dec 21 10:21:29 2007
New Revision: 1632

Log:
Add horizontal flip filter.


Added:
   libavfilter/vf_hflip.c
Modified:
   libavfilter/Makefile
   libavfilter/allfilters.h
   libavfilter/avfilter.c

Modified: libavfilter/Makefile
==============================================================================
--- libavfilter/Makefile	(original)
+++ libavfilter/Makefile	Fri Dec 21 10:21:29 2007
@@ -12,6 +12,7 @@ OBJS = avfilter.o \
 OBJS-yes = vf_crop.o \
            vf_fifo.o \
            vf_fps.o \
+           vf_hflip.o \
            vf_negate.o \
            vf_overlay.o \
            vf_passthrough.o \

Modified: libavfilter/allfilters.h
==============================================================================
--- libavfilter/allfilters.h	(original)
+++ libavfilter/allfilters.h	Fri Dec 21 10:21:29 2007
@@ -27,6 +27,7 @@ extern AVFilter avfilter_vf_fps;
 extern AVFilter avfilter_vf_graph;
 extern AVFilter avfilter_vf_graphdesc;
 extern AVFilter avfilter_vf_graphfile;
+extern AVFilter avfilter_vf_hflip;
 extern AVFilter avfilter_vf_negate;
 extern AVFilter avfilter_vf_overlay;
 extern AVFilter avfilter_vf_passthrough;

Modified: libavfilter/avfilter.c
==============================================================================
--- libavfilter/avfilter.c	(original)
+++ libavfilter/avfilter.c	Fri Dec 21 10:21:29 2007
@@ -278,6 +278,7 @@ void avfilter_init(void)
     avfilter_register(&avfilter_vf_graph);
     avfilter_register(&avfilter_vf_graphdesc);
     avfilter_register(&avfilter_vf_graphfile);
+    avfilter_register(&avfilter_vf_hflip);
     avfilter_register(&avfilter_vf_negate);
     avfilter_register(&avfilter_vf_overlay);
     avfilter_register(&avfilter_vf_passthrough);

Added: libavfilter/vf_hflip.c
==============================================================================
--- (empty file)
+++ libavfilter/vf_hflip.c	Fri Dec 21 10:21:29 2007
@@ -0,0 +1,92 @@
+/*
+ * Horizontal flip filter
+ * Copyright (c) 2007 Benoit Fouet
+ *
+ * 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
+ */
+
+#include "avfilter.h"
+
+typedef struct
+{
+    int hsub;   /**< chroma subsampling along width */
+    int vsub;   /**< chroma subsampling along height */
+} FlipContext;
+
+static int config_props(AVFilterLink *link)
+{
+    FlipContext *flip = link->dst->priv;
+
+    avcodec_get_chroma_sub_sample(link->format, &flip->hsub, &flip->vsub);
+
+    return avfilter_config_link(link->dst->outputs[0]);
+}
+
+static void draw_slice(AVFilterLink *link, int y, int h)
+{
+    FlipContext    *flip = link->dst->priv;
+    AVFilterPicRef *in   = link->cur_pic;
+    AVFilterPicRef *out  = link->dst->outputs[0]->outpic;
+    uint8_t *inrow, *outrow;
+    int i, j, plane;
+
+    /* luma plane */
+    outrow = out->data[0] + y * out->linesize[0];
+    inrow  = in-> data[0] + y * in-> linesize[0] + in->w-y;
+    for(i = 0; i < h; i++) {
+        for(j = 0; j < link->w; j++)
+            outrow[j] = inrow[-j];
+        inrow  += in-> linesize[0];
+        outrow += out->linesize[0];
+    }
+
+    /* chroma planes */
+    for(plane = 1; plane < 4; plane++) {
+        if (in->data[plane]) {
+            outrow = out->data[plane] + (y>>flip->vsub) * out->linesize[plane];
+            inrow  = in-> data[plane] + (y>>flip->vsub) * in-> linesize[plane] +
+                     ((link->w-y) >> flip->hsub);
+
+            for(i = 0; i < h >> flip->vsub; i++) {
+                for(j = 0; j < link->w >> flip->hsub; j++)
+                    outrow[j] = inrow[-j];
+                outrow += out->linesize[plane];
+                inrow  += in-> linesize[plane];
+            }
+        }
+    }
+
+    avfilter_draw_slice(link->dst->outputs[0], y, h);
+}
+
+AVFilter avfilter_vf_hflip =
+{
+    .name      = "hflip",
+    .author    = "Benoit Fouet",
+    .priv_size = sizeof(FlipContext),
+
+    .inputs    = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AV_PAD_VIDEO,
+                                    .draw_slice      = draw_slice,
+                                    .config_props    = config_props,
+                                    .min_perms       = AV_PERM_READ, },
+                                  { .name = NULL}},
+    .outputs   = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AV_PAD_VIDEO, },
+                                  { .name = NULL}},
+};
+