[PATCH] Add vflipfix filter.

[Stefano Sabatini]

---
 libavfilter/Makefile      |    1 +
 libavfilter/allfilters.c  |    1 +
 libavfilter/vf_vflipfix.c |  132 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 134 insertions(+), 0 deletions(-)
 create mode 100644 libavfilter/vf_vflipfix.c

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 210510f..461d24d 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -42,6 +42,7 @@ OBJS-$(CONFIG_SLICIFY_FILTER)                += vf_slicify.o
 OBJS-$(CONFIG_TRANSPOSE_FILTER)              += vf_transpose.o
 OBJS-$(CONFIG_UNSHARP_FILTER)                += vf_unsharp.o
 OBJS-$(CONFIG_VFLIP_FILTER)                  += vf_vflip.o
+OBJS-$(CONFIG_VFLIPFIX_FILTER)               += vf_vflipfix.o
 OBJS-$(CONFIG_YADIF_FILTER)                  += vf_yadif.o
 
 OBJS-$(CONFIG_BUFFER_FILTER)                 += vsrc_buffer.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 9e3ba14..04a8010 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -63,6 +63,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER (TRANSPOSE,   transpose,   vf);
     REGISTER_FILTER (UNSHARP,     unsharp,     vf);
     REGISTER_FILTER (VFLIP,       vflip,       vf);
+    REGISTER_FILTER (VFLIPFIX,    vflipfix,    vf);
     REGISTER_FILTER (YADIF,       yadif,       vf);
 
     REGISTER_FILTER (BUFFER,      buffer,      vsrc);
diff --git a/libavfilter/vf_vflipfix.c b/libavfilter/vf_vflipfix.c
new file mode 100644
index 0000000..656ac3e
--- /dev/null
+++ b/libavfilter/vf_vflipfix.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2010 Stefano Sabatini
+ *
+ * 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
+ * vertically flip filter in case of negative linesizes
+ */
+
+#include "avfilter.h"
+#include "libavutil/pixdesc.h"
+
+typedef struct {
+    int vsub;
+    AVFilterBufferRef *flipped_picref;
+} FlipContext;
+
+static int config_props(AVFilterLink *inlink)
+{
+    FlipContext *flip = inlink->dst->priv;
+    flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
+
+    return 0;
+}
+
+static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms,
+                                           int w, int h)
+{
+    FlipContext *flip = inlink->dst->priv;
+    AVFilterBufferRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0],
+                                                          perms, w, h);
+
+    if (picref->linesize[0] < 0) {
+        /* allocate a new frame and return it */
+        flip->flipped_picref = picref;
+        picref = avfilter_default_get_video_buffer(inlink, perms, w, h);
+    }
+    return picref;
+}
+
+static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+{
+    FlipContext *flip = inlink->dst->priv;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+
+    if (flip->flipped_picref) {
+        outlink->out_buf = flip->flipped_picref;
+        avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
+    } else
+        outlink->out_buf = picref;
+
+    avfilter_start_frame(inlink->dst->outputs[0],
+                         avfilter_ref_buffer(outlink->out_buf, ~0));
+}
+
+static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+    FlipContext *flip = inlink->dst->priv;
+    if (!flip->flipped_picref)
+        avfilter_null_draw_slice(inlink, y, h, slice_dir);
+}
+
+static void end_frame(AVFilterLink *inlink)
+{
+    FlipContext *flip = inlink->dst->priv;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+    AVFilterBufferRef *inpic = inlink->cur_buf;
+    AVFilterBufferRef *outpic = flip->flipped_picref;
+    uint8_t *inrow, *outrow;
+    int plane, i, h;
+
+    if (!flip->flipped_picref) {
+        avfilter_end_frame(outlink);
+        return;
+    }
+
+    /* vflip image */
+    for (plane = 0; plane < 4 && inpic->data[plane]; plane++) {
+        h = plane == 1 || plane == 2 ? inlink->h>>flip->vsub : inlink->h;
+        inrow  = inpic ->data[plane];
+        outrow = outpic->data[plane];
+
+        for (i = 0; i < h; i++) {
+            memcpy(outrow, inrow, -outpic->linesize[plane]);
+            inrow  += inpic ->linesize[plane];
+            outrow += outpic->linesize[plane];
+        }
+    }
+
+    flip->flipped_picref = NULL;
+    avfilter_unref_buffer(inpic);
+    avfilter_draw_slice(outlink, 0, inlink->h, 1);
+    avfilter_end_frame(outlink);
+    avfilter_unref_buffer(outpic);
+}
+
+AVFilter avfilter_vf_vflipfix = {
+    .name      = "vflipfix",
+    .description = NULL_IF_CONFIG_SMALL("Vertically flip the input video."),
+    .priv_size = sizeof(FlipContext),
+
+    .inputs    = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO,
+                                    .config_props     = config_props,
+                                    .get_video_buffer = get_video_buffer,
+                                    .start_frame      = start_frame,
+                                    .draw_slice       = null_draw_slice,
+                                    .end_frame        = end_frame,
+                                    .min_perms        = AV_PERM_READ, },
+                                  { .name = NULL}},
+    .outputs   = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO, },
+                                  { .name = NULL}},
+
+    .capabilities = AVFILTER_CAP_SUPPORT_NEG_LINESIZES,
+};
-- 
1.7.1


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