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/*
* Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
*
* 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
*/
/**
* @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/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;
char *color_str;
unsigned char yuv_color[4];
int vsub, hsub; ///< chroma subsampling
} DrawBoxContext;
static av_cold int init(AVFilterContext *ctx)
{
DrawBoxContext *drawbox= ctx->priv;
uint8_t rgba_color[4];
if (av_parse_color(rgba_color, drawbox->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 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)
{
DrawBoxContext *drawbox = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
drawbox->hsub = desc->log2_chroma_w;
drawbox->vsub = desc->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_VERBOSE, "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 int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
DrawBoxContext *drawbox = inlink->dst->priv;
int plane, x, y, xb = drawbox->x, yb = drawbox->y;
unsigned char *row[4];
for (y = FFMAX(yb, 0); y < frame->height && y < (yb + drawbox->h); 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 >> drawbox->vsub);
for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < frame->width; 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];
}
}
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(DrawBoxContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{ "x", "Horizontal position of the left box edge", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "y", "Vertical position of the top box edge", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
{ "width", "Width of the box", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "height", "Height of the box", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "color", "Color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
{ NULL },
};
static const AVClass drawbox_class = {
.class_name = "drawbox",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVFilterPad avfilter_vf_drawbox_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_drawbox_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_drawbox = {
.name = "drawbox",
.description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
.priv_size = sizeof(DrawBoxContext),
.priv_class = &drawbox_class,
.init = init,
.query_formats = query_formats,
.inputs = avfilter_vf_drawbox_inputs,
.outputs = avfilter_vf_drawbox_outputs,
};
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