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FFmpeg/libavfilter/vf_drawbox.c
Gyan Doshi 1c76134fe3 avfilter/drawbox+drawgrid - add option to prevent overwriting of source pixels 
If the user-supplied color in drawbox and drawgrid filters is non-opaque,
the box & grid painting overwrites the input's pixels (including alpha).
Users typically expect the alpha of the specified color to only act as a key
for compositing on top of the main input.

Added option allows users to select between replacement and composition.
Tested and documented.
2017-12-14 13:44:45 -09:00

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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
* Box and grid drawing filters. 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/eval.h"
#include "libavutil/pixdesc.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
static const char *const var_names[] = {
"dar",
"hsub", "vsub",
"in_h", "ih", ///< height of the input video
"in_w", "iw", ///< width of the input video
"sar",
"x",
"y",
"h", ///< height of the rendered box
"w", ///< width of the rendered box
"t",
"fill",
NULL
};
enum { Y, U, V, A };
enum var_name {
VAR_DAR,
VAR_HSUB, VAR_VSUB,
VAR_IN_H, VAR_IH,
VAR_IN_W, VAR_IW,
VAR_SAR,
VAR_X,
VAR_Y,
VAR_H,
VAR_W,
VAR_T,
VAR_MAX,
VARS_NB
};
typedef struct DrawBoxContext {
const AVClass *class;
int x, y, w, h;
int thickness;
char *color_str;
unsigned char yuv_color[4];
int invert_color; ///< invert luma color
int vsub, hsub; ///< chroma subsampling
char *x_expr, *y_expr; ///< expression for x and y
char *w_expr, *h_expr; ///< expression for width and height
char *t_expr; ///< expression for thickness
int have_alpha;
int replace;
} DrawBoxContext;
static const int NUM_EXPR_EVALS = 5;
static av_cold int init(AVFilterContext *ctx)
{
DrawBoxContext *s = ctx->priv;
uint8_t rgba_color[4];
if (!strcmp(s->color_str, "invert"))
s->invert_color = 1;
else if (av_parse_color(rgba_color, s->color_str, -1, ctx) < 0)
return AVERROR(EINVAL);
if (!s->invert_color) {
s->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
s->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
s->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
s->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_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_NONE
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
DrawBoxContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
double var_values[VARS_NB], res;
char *expr;
int ret;
int i;
s->hsub = desc->log2_chroma_w;
s->vsub = desc->log2_chroma_h;
s->have_alpha = desc->flags & AV_PIX_FMT_FLAG_ALPHA;
var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
var_values[VAR_DAR] = (double)inlink->w / inlink->h * var_values[VAR_SAR];
var_values[VAR_HSUB] = s->hsub;
var_values[VAR_VSUB] = s->vsub;
var_values[VAR_X] = NAN;
var_values[VAR_Y] = NAN;
var_values[VAR_H] = NAN;
var_values[VAR_W] = NAN;
var_values[VAR_T] = NAN;
for (i = 0; i <= NUM_EXPR_EVALS; i++) {
/* evaluate expressions, fail on last iteration */
var_values[VAR_MAX] = inlink->w;
if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
goto fail;
s->x = var_values[VAR_X] = res;
var_values[VAR_MAX] = inlink->h;
if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
goto fail;
s->y = var_values[VAR_Y] = res;
var_values[VAR_MAX] = inlink->w - s->x;
if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
goto fail;
s->w = var_values[VAR_W] = res;
var_values[VAR_MAX] = inlink->h - s->y;
if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
goto fail;
s->h = var_values[VAR_H] = res;
var_values[VAR_MAX] = INT_MAX;
if ((ret = av_expr_parse_and_eval(&res, (expr = s->t_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
goto fail;
s->thickness = var_values[VAR_T] = res;
}
/* if w or h are zero, use the input w/h */
s->w = (s->w > 0) ? s->w : inlink->w;
s->h = (s->h > 0) ? s->h : inlink->h;
/* sanity check width and height */
if (s->w < 0 || s->h < 0) {
av_log(ctx, AV_LOG_ERROR, "Size values less than 0 are not acceptable.\n");
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
s->x, s->y, s->w, s->h,
s->yuv_color[Y], s->yuv_color[U], s->yuv_color[V], s->yuv_color[A]);
return 0;
fail:
av_log(ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s'.\n",
expr);
return ret;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
DrawBoxContext *s = inlink->dst->priv;
int plane, x, y, xb = s->x, yb = s->y;
unsigned char *row[4];
if (s->have_alpha && s->replace) {
for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) {
row[0] = frame->data[0] + y * frame->linesize[0];
row[3] = frame->data[3] + y * frame->linesize[3];
for (plane = 1; plane < 3; plane++)
row[plane] = frame->data[plane] +
frame->linesize[plane] * (y >> s->vsub);
if (s->invert_color) {
for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++)
if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
(x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness))
row[0][x] = 0xff - row[0][x];
} else {
for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) {
if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
(x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness)) {
row[0][x ] = s->yuv_color[Y];
row[1][x >> s->hsub] = s->yuv_color[U];
row[2][x >> s->hsub] = s->yuv_color[V];
row[3][x ] = s->yuv_color[A];
}
}
}
}
} else {
for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->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 >> s->vsub);
if (s->invert_color) {
for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++)
if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
(x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness))
row[0][x] = 0xff - row[0][x];
} else {
for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) {
double alpha = (double)s->yuv_color[A] / 255;
if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
(x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness)) {
row[0][x ] = (1 - alpha) * row[0][x ] + alpha * s->yuv_color[Y];
row[1][x >> s->hsub] = (1 - alpha) * row[1][x >> s->hsub] + alpha * s->yuv_color[U];
row[2][x >> s->hsub] = (1 - alpha) * row[2][x >> s->hsub] + alpha * s->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|AV_OPT_FLAG_FILTERING_PARAM
#if CONFIG_DRAWBOX_FILTER
static const AVOption drawbox_options[] = {
{ "x", "set horizontal position of the left box edge", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "y", "set vertical position of the top box edge", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "width", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "w", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "height", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "h", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "color", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "c", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "thickness", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "t", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "replace", "replace color & alpha", OFFSET(replace), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(drawbox);
static const AVFilterPad drawbox_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad drawbox_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_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 = drawbox_inputs,
.outputs = drawbox_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
#endif /* CONFIG_DRAWBOX_FILTER */
#if CONFIG_DRAWGRID_FILTER
static av_pure av_always_inline int pixel_belongs_to_grid(DrawBoxContext *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 drawgrid_filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
DrawBoxContext *drawgrid = inlink->dst->priv;
int plane, x, y;
uint8_t *row[4];
if (drawgrid->have_alpha && drawgrid->replace) {
for (y = 0; y < frame->height; y++) {
row[0] = frame->data[0] + y * frame->linesize[0];
row[3] = frame->data[3] + y * frame->linesize[3];
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++) {
if (pixel_belongs_to_grid(drawgrid, x, y)) {
row[0][x ] = drawgrid->yuv_color[Y];
row[1][x >> drawgrid->hsub] = drawgrid->yuv_color[U];
row[2][x >> drawgrid->hsub] = drawgrid->yuv_color[V];
row[3][x ] = drawgrid->yuv_color[A];
}
}
}
}
} else {
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);
}
static const AVOption drawgrid_options[] = {
{ "x", "set horizontal offset", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "y", "set vertical offset", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "width", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "w", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "height", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "h", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_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(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "t", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "replace", "replace color & alpha", OFFSET(replace), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(drawgrid);
static const AVFilterPad drawgrid_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = drawgrid_filter_frame,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad drawgrid_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_drawgrid = {
.name = "drawgrid",
.description = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."),
.priv_size = sizeof(DrawBoxContext),
.priv_class = &drawgrid_class,
.init = init,
.query_formats = query_formats,
.inputs = drawgrid_inputs,
.outputs = drawgrid_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
#endif /* CONFIG_DRAWGRID_FILTER */
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