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/*
* Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
*
* 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
* Box drawing filter. Also a nice template for a filter that needs to
* write in the input frame.
*/
#include "libavutil/colorspace.h"
#include "libavutil/pixdesc.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
enum { Y, U, V, A };
typedef struct {
int x, y, w, h;
unsigned char yuv_color[4];
int vsub, hsub; ///< chroma subsampling
} DrawBoxContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
DrawBoxContext *drawbox= ctx->priv;
char color_str[1024] = "black";
uint8_t rgba_color[4];
drawbox->x = drawbox->y = drawbox->w = drawbox->h = 0;
if (args)
sscanf(args, "%d:%d:%d:%d:%s",
&drawbox->x, &drawbox->y, &drawbox->w, &drawbox->h, color_str);
if (av_parse_color(rgba_color, color_str, -1, ctx) < 0)
return AVERROR(EINVAL);
drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
drawbox->yuv_color[A] = rgba_color[3];
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
PIX_FMT_YUV411P, PIX_FMT_YUV410P,
PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static int config_input(AVFilterLink *inlink)
{
DrawBoxContext *drawbox = inlink->dst->priv;
drawbox->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
drawbox->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
if (drawbox->w == 0) drawbox->w = inlink->w;
if (drawbox->h == 0) drawbox->h = inlink->h;
av_log(inlink->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
drawbox->w, drawbox->y, drawbox->w, drawbox->h,
drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]);
return 0;
}
static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
{
DrawBoxContext *drawbox = inlink->dst->priv;
int plane, x, y, xb = drawbox->x, yb = drawbox->y;
unsigned char *row[4];
AVFilterBufferRef *picref = inlink->cur_buf;
for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + drawbox->h); y++) {
row[0] = picref->data[0] + y * picref->linesize[0];
for (plane = 1; plane < 3; plane++)
row[plane] = picref->data[plane] +
picref->linesize[plane] * (y >> drawbox->vsub);
for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) {
double alpha = (double)drawbox->yuv_color[A] / 255;
if ((y - yb < 3) || (yb + drawbox->h - y < 4) ||
(x - xb < 3) || (xb + drawbox->w - x < 4)) {
row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y];
row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U];
row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V];
}
}
}
avfilter_draw_slice(inlink->dst->outputs[0], y0, h, 1);
}
AVFilter avfilter_vf_drawbox = {
.name = "drawbox",
.description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
.priv_size = sizeof(DrawBoxContext),
.init = init,
.query_formats = query_formats,
.inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.get_video_buffer = avfilter_null_get_video_buffer,
.start_frame = avfilter_null_start_frame,
.draw_slice = draw_slice,
.end_frame = avfilter_null_end_frame,
.min_perms = AV_PERM_WRITE | AV_PERM_READ,
.rej_perms = AV_PERM_PRESERVE },
{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
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