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,
+};