lavfi: port MP swapuv filter

Changelog

@@ -13,6 +13,7 @@ version next:
 - bluray protocol
 - blackdetect filter
 - libutvideo encoder wrapper (--enable-libutvideo)
+- swapuv filter
 
 
 version 0.10:

doc/filters.texi

@@ -2631,6 +2631,9 @@ For example:
 will create two separate outputs from the same input, one cropped and
 one padded.
 
+@section swapuv
+Swap U & V plane.
+
 @section thumbnail
 Select the most representative frame in a given sequence of consecutive frames.
 

libavfilter/Makefile

@@ -87,6 +87,7 @@ 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-$(CONFIG_SWAPUV_FILTER)                 += vf_swapuv.o
 OBJS-$(CONFIG_THUMBNAIL_FILTER)              += vf_thumbnail.o
 OBJS-$(CONFIG_TINTERLACE_FILTER)             += vf_tinterlace.o
 OBJS-$(CONFIG_TRANSPOSE_FILTER)              += vf_transpose.o

libavfilter/allfilters.c

@@ -95,6 +95,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER (SHOWINFO,    showinfo,    vf);
     REGISTER_FILTER (SLICIFY,     slicify,     vf);
     REGISTER_FILTER (SPLIT,       split,       vf);
+    REGISTER_FILTER (SWAPUV,      swapuv,      vf);
     REGISTER_FILTER (THUMBNAIL,   thumbnail,   vf);
     REGISTER_FILTER (TINTERLACE,  tinterlace,  vf);
     REGISTER_FILTER (TRANSPOSE,   transpose,   vf);

libavfilter/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR 63
+#define LIBAVFILTER_VERSION_MINOR 64
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_swapuv.c

@@ -0,0 +1,93 @@
+/*
+ * 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 "avfilter.h"
+
+static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
+                                           int w, int h)
+{
+    AVFilterBufferRef *picref =
+        avfilter_default_get_video_buffer(link, perms, w, h);
+    uint8_t *tmp;
+    int tmp2;
+
+    tmp             = picref->data[2];
+    picref->data[2] = picref->data[1];
+    picref->data[1] = tmp;
+
+    tmp2                = picref->linesize[2];
+    picref->linesize[2] = picref->linesize[1];
+    picref->linesize[1] = tmp2;
+
+    return picref;
+}
+
+static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
+{
+    AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
+
+    outpicref->data[1] = inpicref->data[2];
+    outpicref->data[2] = inpicref->data[1];
+
+    outpicref->linesize[1] = inpicref->linesize[2];
+    outpicref->linesize[2] = inpicref->linesize[1];
+
+    avfilter_start_frame(link->dst->outputs[0], outpicref);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum PixelFormat pix_fmts[] = {
+        PIX_FMT_YUV420P, PIX_FMT_YUVJ420P, PIX_FMT_YUVA420P,
+        PIX_FMT_YUV444P, PIX_FMT_YUVJ444P, PIX_FMT_YUVA444P,
+        PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
+        PIX_FMT_YUV422P, PIX_FMT_YUVJ422P,
+        PIX_FMT_YUV411P,
+        PIX_FMT_NONE,
+    };
+
+    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+    return 0;
+}
+
+AVFilter avfilter_vf_swapuv = {
+    .name      = "swapuv",
+    .description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
+    .priv_size = 0,
+    .query_formats = query_formats,
+
+    .inputs = (const AVFilterPad[]) {
+        { .name             = "default",
+          .type             = AVMEDIA_TYPE_VIDEO,
+          .get_video_buffer = get_video_buffer,
+          .start_frame      = start_frame, },
+        { .name = NULL }
+    },
+    .outputs = (const AVFilterPad[]) {
+        { .name             = "default",
+          .type             = AVMEDIA_TYPE_VIDEO, },
+        { .name             = NULL }
+    },
+};