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/*
* 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
*/
#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 */
int 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(©);
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_FILTERING_PARAM | 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 },
};
AVFILTER_DEFINE_CLASS(shuffleplanes);
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,
};
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