lavfi: add shuffleplanes filter

Changelog

@@ -3,6 +3,7 @@ releases are sorted from youngest to oldest.
 
 version <next>:
 - compand audio filter
+- shuffleplanes filter
 
 
 version 10:

doc/filters.texi

@@ -2453,6 +2453,36 @@ Adler-32 checksum of each plane of the input frame, expressed in the form
 "[@var{c0} @var{c1} @var{c2} @var{c3}]"
 @end table
 
+@section shuffleplanes
+
+Reorder and/or duplicate video planes.
+
+This filter accepts the following options:
+
+@table @option
+
+@item map0
+The index of the input plane to be used as the first output plane.
+
+@item map1
+The index of the input plane to be used as the second output plane.
+
+@item map2
+The index of the input plane to be used as the third output plane.
+
+@item map3
+The index of the input plane to be used as the fourth output plane.
+
+@end table
+
+The first plane has the index 0. The default is to keep the input unchanged.
+
+E.g.
+@example
+avconv -i INPUT -vf shuffleplanes=0:2:1:3 OUTPUT
+@end example
+swaps the second and third planes of the input.
+
 @section split
 
 Split input video into several identical outputs.

libavfilter/Makefile

@@ -78,6 +78,7 @@ OBJS-$(CONFIG_SETPTS_FILTER)                 += setpts.o
 OBJS-$(CONFIG_SETSAR_FILTER)                 += vf_aspect.o
 OBJS-$(CONFIG_SETTB_FILTER)                  += vf_settb.o
 OBJS-$(CONFIG_SHOWINFO_FILTER)               += vf_showinfo.o
+OBJS-$(CONFIG_SHUFFLEPLANES_FILTER)          += vf_shuffleplanes.o
 OBJS-$(CONFIG_SPLIT_FILTER)                  += split.o
 OBJS-$(CONFIG_TRANSPOSE_FILTER)              += vf_transpose.o
 OBJS-$(CONFIG_TRIM_FILTER)                   += trim.o

libavfilter/allfilters.c

@@ -98,6 +98,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(SETSAR,         setsar,         vf);
     REGISTER_FILTER(SETTB,          settb,          vf);
     REGISTER_FILTER(SHOWINFO,       showinfo,       vf);
+    REGISTER_FILTER(SHUFFLEPLANES,  shuffleplanes,  vf);
     REGISTER_FILTER(SPLIT,          split,          vf);
     REGISTER_FILTER(TRANSPOSE,      transpose,      vf);
     REGISTER_FILTER(TRIM,           trim,           vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  4
-#define LIBAVFILTER_VERSION_MINOR  2
+#define LIBAVFILTER_VERSION_MINOR  3
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_shuffleplanes.c

@@ -0,0 +1,172 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/common.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/pixfmt.h"
+
+#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct ShufflePlanesContext {
+    const AVClass *class;
+
+    /* number of planes in the selected pixel format */
+    int planes;
+
+    /* mapping indices */
+    uint8_t map[4];
+
+    /* set to 1 if some plane is used more than once, so we need to make a copy */
+    int copy;
+} ShufflePlanesContext;
+
+static av_cold int shuffleplanes_config_input(AVFilterLink *inlink)
+{
+    AVFilterContext    *ctx = inlink->dst;
+    ShufflePlanesContext *s = ctx->priv;
+    const AVPixFmtDescriptor *desc;
+    int used[4] = { 0 };
+    int i;
+
+    s->copy   = 0;
+    s->planes = av_pix_fmt_count_planes(inlink->format);
+    desc      = av_pix_fmt_desc_get(inlink->format);
+
+    for (i = 0; i < s->planes; i++) {
+        if (s->map[i] >= s->planes) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Non-existing input plane #%d mapped to output plane #%d.\n",
+                   s->map[i], i);
+            return AVERROR(EINVAL);
+        }
+
+        if ((desc->log2_chroma_h || desc->log2_chroma_w) &&
+            (i == 1 || i == 2) != (s->map[i] == 1 || s->map[i] == 2)) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Cannot map between a subsampled chroma plane and a luma "
+                   "or alpha plane.\n");
+            return AVERROR(EINVAL);
+        }
+
+        if ((desc->flags & AV_PIX_FMT_FLAG_PAL ||
+             desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) &&
+            (i == 1) != (s->map[i] == 1)) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Cannot map between a palette plane and a data plane.\n");
+            return AVERROR(EINVAL);
+        }
+        if (used[s->map[i]])
+            s->copy = 1;
+        used[s->map[i]]++;
+    }
+
+    return 0;
+}
+
+static int shuffleplanes_filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+    AVFilterContext          *ctx = inlink->dst;
+    ShufflePlanesContext       *s = ctx->priv;
+    uint8_t *shuffled_data[4]     = { NULL };
+    int      shuffled_linesize[4] = { 0 };
+    int i, ret;
+
+    for (i = 0; i < s->planes; i++) {
+        shuffled_data[i]     = frame->data[s->map[i]];
+        shuffled_linesize[i] = frame->linesize[s->map[i]];
+    }
+    memcpy(frame->data,     shuffled_data,     sizeof(shuffled_data));
+    memcpy(frame->linesize, shuffled_linesize, sizeof(shuffled_linesize));
+
+    if (s->copy) {
+        AVFrame *copy = ff_get_video_buffer(ctx->outputs[0], frame->width, frame->height);
+
+        if (!copy) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        av_frame_copy(copy, frame);
+
+        ret = av_frame_copy_props(copy, frame);
+        if (ret < 0) {
+            av_frame_free(&copy);
+            goto fail;
+        }
+
+        av_frame_free(&frame);
+        frame = copy;
+    }
+
+    return ff_filter_frame(ctx->outputs[0], frame);
+fail:
+    av_frame_free(&frame);
+    return ret;
+}
+
+#define OFFSET(x) offsetof(ShufflePlanesContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption shuffleplanes_options[] = {
+    { "map0", "Index of the input plane to be used as the first output plane ",  OFFSET(map[0]), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, FLAGS },
+    { "map1", "Index of the input plane to be used as the second output plane ", OFFSET(map[1]), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 4, FLAGS },
+    { "map2", "Index of the input plane to be used as the third output plane ",  OFFSET(map[2]), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, 4, FLAGS },
+    { "map3", "Index of the input plane to be used as the fourth output plane ", OFFSET(map[3]), AV_OPT_TYPE_INT, { .i64 = 3 }, 0, 4, FLAGS },
+    { NULL },
+};
+
+static const AVClass shuffleplanes_class = {
+    .class_name = "shuffleplanes",
+    .item_name  = av_default_item_name,
+    .option     = shuffleplanes_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad shuffleplanes_inputs[] = {
+    {
+        .name             = "default",
+        .type             = AVMEDIA_TYPE_VIDEO,
+        .config_props     = shuffleplanes_config_input,
+        .filter_frame     = shuffleplanes_filter_frame,
+        .get_video_buffer = ff_null_get_video_buffer,
+    },
+    { NULL },
+};
+
+static const AVFilterPad shuffleplanes_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL },
+};
+
+AVFilter ff_vf_shuffleplanes = {
+    .name         = "shuffleplanes",
+    .description  = NULL_IF_CONFIG_SMALL("Shuffle video planes"),
+
+    .priv_size    = sizeof(ShufflePlanesContext),
+    .priv_class   = &shuffleplanes_class,
+
+    .inputs       = shuffleplanes_inputs,
+    .outputs      = shuffleplanes_outputs,
+};