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/*
* Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
* Copyright (c) 2013 Andrey Utkin <andrey.krieger.utkin gmail com>
*
* 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
* Grid drawing filter.
* Code derived from drawbox filter.
*/
#include "libavutil/colorspace.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
enum { Y, U, V, A };
typedef struct {
const AVClass *class;
int x, y, w, h, thickness;
char *color_str;
unsigned char yuv_color[4];
int invert_color; ///< invert luma color
int vsub, hsub; ///< chroma subsampling
} DrawGridContext;
static av_cold int init(AVFilterContext *ctx)
{
DrawGridContext *drawgrid = ctx->priv;
uint8_t rgba_color[4];
if (!strcmp(drawgrid->color_str, "invert"))
drawgrid->invert_color = 1;
else if (av_parse_color(rgba_color, drawgrid->color_str, -1, ctx) < 0)
return AVERROR(EINVAL);
if (!drawgrid->invert_color) {
drawgrid->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
drawgrid->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
drawgrid->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
drawgrid->yuv_color[A] = rgba_color[3];
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_input(AVFilterLink *inlink)
{
DrawGridContext *drawgrid = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
drawgrid->hsub = desc->log2_chroma_w;
drawgrid->vsub = desc->log2_chroma_h;
if (drawgrid->w == 0) drawgrid->w = inlink->w - drawgrid->thickness;
if (drawgrid->h == 0) drawgrid->h = inlink->h - drawgrid->thickness;
av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
drawgrid->x, drawgrid->y, drawgrid->w, drawgrid->h,
drawgrid->yuv_color[Y], drawgrid->yuv_color[U], drawgrid->yuv_color[V], drawgrid->yuv_color[A]);
return 0;
}
static av_pure av_always_inline int pixel_belongs_to_grid(DrawGridContext *drawgrid, int x, int y)
{
// x is horizontal (width) coord,
// y is vertical (height) coord
int x_modulo;
int y_modulo;
// Abstract from the offset
x -= drawgrid->x;
y -= drawgrid->y;
x_modulo = x % drawgrid->w;
y_modulo = y % drawgrid->h;
// If x or y got negative, fix values to preserve logics
if (x_modulo < 0)
x_modulo += drawgrid->w;
if (y_modulo < 0)
y_modulo += drawgrid->h;
return x_modulo < drawgrid->thickness // Belongs to vertical line
|| y_modulo < drawgrid->thickness; // Belongs to horizontal line
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
DrawGridContext *drawgrid = inlink->dst->priv;
int plane, x, y;
uint8_t *row[4];
for (y = 0; y < frame->height; y++) {
row[0] = frame->data[0] + y * frame->linesize[0];
for (plane = 1; plane < 3; plane++)
row[plane] = frame->data[plane] +
frame->linesize[plane] * (y >> drawgrid->vsub);
if (drawgrid->invert_color) {
for (x = 0; x < frame->width; x++)
if (pixel_belongs_to_grid(drawgrid, x, y))
row[0][x] = 0xff - row[0][x];
} else {
for (x = 0; x < frame->width; x++) {
double alpha = (double)drawgrid->yuv_color[A] / 255;
if (pixel_belongs_to_grid(drawgrid, x, y)) {
row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawgrid->yuv_color[Y];
row[1][x >> drawgrid->hsub] = (1 - alpha) * row[1][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[U];
row[2][x >> drawgrid->hsub] = (1 - alpha) * row[2][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[V];
}
}
}
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(DrawGridContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption drawgrid_options[] = {
{ "x", "set horizontal offset", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "y", "set vertical offset", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "width", "set width of grid cell", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "w", "set width of grid cell", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "height", "set height of grid cell", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "h", "set height of grid cell", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "color", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "c", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "thickness", "set grid line thickness", OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=1}, 0, INT_MAX, FLAGS },
{ "t", "set grid line thickness", OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=1}, 0, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(drawgrid);
static const AVFilterPad avfilter_vf_drawgrid_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_drawgrid_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_drawgrid = {
.name = "drawgrid",
.description = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."),
.priv_size = sizeof(DrawGridContext),
.priv_class = &drawgrid_class,
.init = init,
.query_formats = query_formats,
.inputs = avfilter_vf_drawgrid_inputs,
.outputs = avfilter_vf_drawgrid_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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