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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
*/
/**
* @file
* Display frame palette (AV_PIX_FMT_PAL8)
*/
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct ShowPaletteContext {
const AVClass *class;
int size;
} ShowPaletteContext;
#define OFFSET(x) offsetof(ShowPaletteContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption showpalette_options[] = {
{ "s", "set pixel box size", OFFSET(size), AV_OPT_TYPE_INT, {.i64=30}, 1, 100, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showpalette);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat in_fmts[] = {AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE};
static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
int ret = ff_formats_ref(ff_make_format_list(in_fmts),
&ctx->inputs[0]->outcfg.formats);
if (ret < 0)
return ret;
return ff_formats_ref(ff_make_format_list(out_fmts),
&ctx->outputs[0]->incfg.formats);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
const ShowPaletteContext *s = ctx->priv;
outlink->w = outlink->h = 16 * s->size;
return 0;
}
static void disp_palette(AVFrame *out, const AVFrame *in, int size)
{
int x, y, i, j;
uint32_t *dst = (uint32_t *)out->data[0];
const int dst_linesize = out->linesize[0] >> 2;
const uint32_t *pal = (uint32_t *)in->data[1];
for (y = 0; y < 16; y++)
for (x = 0; x < 16; x++)
for (j = 0; j < size; j++)
for (i = 0; i < size; i++)
dst[(y*dst_linesize + x) * size + j*dst_linesize + i] = pal[y*16 + x];
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFrame *out;
AVFilterContext *ctx = inlink->dst;
const ShowPaletteContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
disp_palette(out, in, s->size);
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad showpalette_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad showpalette_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_showpalette = {
.name = "showpalette",
.description = NULL_IF_CONFIG_SMALL("Display frame palette."),
.priv_size = sizeof(ShowPaletteContext),
.query_formats = query_formats,
.inputs = showpalette_inputs,
.outputs = showpalette_outputs,
.priv_class = &showpalette_class,
};
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