1 files changed, 110 insertions, 0 deletions
diff --git a/libavfilter/vf_swapuv.c b/libavfilter/vf_swapuv.c
new file mode 100644
index 0000000..175e39c
--- /dev/null
+++ b/libavfilter/vf_swapuv.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ * swap UV filter
+ */
+
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+static void do_swap(AVFrame *frame)
+{
+    FFSWAP(uint8_t*,     frame->data[1],     frame->data[2]);
+    FFSWAP(int,          frame->linesize[1], frame->linesize[2]);
+    FFSWAP(uint64_t,     frame->error[1],    frame->error[2]);
+    FFSWAP(AVBufferRef*, frame->buf[1],      frame->buf[2]);
+}
+
+static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
+{
+    AVFrame *picref = ff_default_get_video_buffer(link, w, h);
+    do_swap(picref);
+    return picref;
+}
+
+static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
+{
+    do_swap(inpicref);
+    return ff_filter_frame(link->dst->outputs[0], inpicref);
+}
+
+static int is_planar_yuv(const AVPixFmtDescriptor *desc)
+{
+    int i;
+
+    if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) ||
+        desc->nb_components < 3 ||
+        (desc->comp[1].depth_minus1 != desc->comp[2].depth_minus1))
+        return 0;
+    for (i = 0; i < desc->nb_components; i++) {
+        if (desc->comp[i].offset_plus1 != 1 ||
+            desc->comp[i].shift != 0 ||
+            desc->comp[i].plane != i)
+            return 0;
+    }
+
+    return 1;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    int fmt;
+
+    for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
+        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
+        if (is_planar_yuv(desc))
+            ff_add_format(&formats, fmt);
+    }
+
+    ff_set_common_formats(ctx, formats);
+    return 0;
+}
+
+static const AVFilterPad swapuv_inputs[] = {
+    {
+        .name             = "default",
+        .type             = AVMEDIA_TYPE_VIDEO,
+        .get_video_buffer = get_video_buffer,
+        .filter_frame     = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad swapuv_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_swapuv = {
+    .name          = "swapuv",
+    .description   = NULL_IF_CONFIG_SMALL("Swap U and V components."),
+    .query_formats = query_formats,
+    .inputs        = swapuv_inputs,
+    .outputs       = swapuv_outputs,
+};