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FFmpeg/libavfilter/vf_drawbox.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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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 "libavutil/detection_bbox.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
char *box_source_string; ///< string for box data source
int have_alpha;
int replace;
enum AVFrameSideDataType box_source;
} DrawBoxContext;
static const int NUM_EXPR_EVALS = 5;
typedef int (*PixelBelongsToRegion)(DrawBoxContext *s, int x, int y);
#define ASSIGN_THREE_CHANNELS \
row[0] = frame->data[0] + y * frame->linesize[0]; \
row[1] = frame->data[1] + (y >> ctx->vsub) * frame->linesize[1]; \
row[2] = frame->data[2] + (y >> ctx->vsub) * frame->linesize[2];
#define ASSIGN_FOUR_CHANNELS \
ASSIGN_THREE_CHANNELS \
row[3] = frame->data[3] + y * frame->linesize[3];
static void draw_region(AVFrame *frame, DrawBoxContext *ctx, int left, int top, int right, int down,
PixelBelongsToRegion pixel_belongs_to_region)
{
unsigned char *row[4];
int x, y;
if (ctx->have_alpha && ctx->replace) {
for (y = top; y < down; y++) {
ASSIGN_FOUR_CHANNELS
if (ctx->invert_color) {
for (x = left; x < right; x++)
if (pixel_belongs_to_region(ctx, x, y))
row[0][x] = 0xff - row[0][x];
} else {
for (x = left; x < right; x++) {
if (pixel_belongs_to_region(ctx, x, y)) {
row[0][x ] = ctx->yuv_color[Y];
row[1][x >> ctx->hsub] = ctx->yuv_color[U];
row[2][x >> ctx->hsub] = ctx->yuv_color[V];
row[3][x ] = ctx->yuv_color[A];
}
}
}
}
} else {
for (y = top; y < down; y++) {
ASSIGN_THREE_CHANNELS
if (ctx->invert_color) {
for (x = left; x < right; x++)
if (pixel_belongs_to_region(ctx, x, y))
row[0][x] = 0xff - row[0][x];
} else {
for (x = left; x < right; x++) {
double alpha = (double)ctx->yuv_color[A] / 255;
if (pixel_belongs_to_region(ctx, x, y)) {
row[0][x ] = (1 - alpha) * row[0][x ] + alpha * ctx->yuv_color[Y];
row[1][x >> ctx->hsub] = (1 - alpha) * row[1][x >> ctx->hsub] + alpha * ctx->yuv_color[U];
row[2][x >> ctx->hsub] = (1 - alpha) * row[2][x >> ctx->hsub] + alpha * ctx->yuv_color[V];
}
}
}
}
}
}
static enum AVFrameSideDataType box_source_string_parse(const char *box_source_string)
{
av_assert0(box_source_string);
if (!strcmp(box_source_string, "side_data_detection_bboxes")) {
return AV_FRAME_DATA_DETECTION_BBOXES;
} else {
// will support side_data_regions_of_interest next
return AVERROR(EINVAL);
}
}
static av_cold int init(AVFilterContext *ctx)
{
DrawBoxContext *s = ctx->priv;
uint8_t rgba_color[4];
if (s->box_source_string) {
s->box_source = box_source_string_parse(s->box_source_string);
if ((int)s->box_source < 0) {
av_log(ctx, AV_LOG_ERROR, "Error box source: %s\n",s->box_source_string);
return AVERROR(EINVAL);
}
}
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
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
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 av_pure av_always_inline int pixel_belongs_to_box(DrawBoxContext *s, int x, int y)
{
return (y - s->y < s->thickness) || (s->y + s->h - 1 - y < s->thickness) ||
(x - s->x < s->thickness) || (s->x + s->w - 1 - x < s->thickness);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
DrawBoxContext *s = inlink->dst->priv;
const AVDetectionBBoxHeader *header = NULL;
const AVDetectionBBox *bbox;
AVFrameSideData *sd;
int loop = 1;
if (s->box_source == AV_FRAME_DATA_DETECTION_BBOXES) {
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_DETECTION_BBOXES);
if (sd) {
header = (AVDetectionBBoxHeader *)sd->data;
loop = header->nb_bboxes;
} else {
av_log(s, AV_LOG_WARNING, "No detection bboxes.\n");
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
}
for (int i = 0; i < loop; i++) {
if (header) {
bbox = av_get_detection_bbox(header, i);
s->y = bbox->y;
s->x = bbox->x;
s->h = bbox->h;
s->w = bbox->w;
}
draw_region(frame, s, FFMAX(s->x, 0), FFMAX(s->y, 0), FFMIN(s->x + s->w, frame->width),
FFMIN(s->y + s->h, frame->height), pixel_belongs_to_box);
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
{
AVFilterLink *inlink = ctx->inputs[0];
DrawBoxContext *s = ctx->priv;
int old_x = s->x;
int old_y = s->y;
int old_w = s->w;
int old_h = s->h;
int old_t = s->thickness;
int old_r = s->replace;
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
ret = init(ctx);
if (ret < 0)
goto end;
ret = config_input(inlink);
end:
if (ret < 0) {
s->x = old_x;
s->y = old_y;
s->w = old_w;
s->h = old_h;
s->thickness = old_t;
s->replace = old_r;
}
return ret;
}
#define OFFSET(x) offsetof(DrawBoxContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_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" }, 0, 0, FLAGS },
{ "y", "set vertical position of the top box edge", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "width", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "w", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "height", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "h", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "color", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
{ "c", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
{ "thickness", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, 0, 0, FLAGS },
{ "t", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, 0, 0, FLAGS },
{ "replace", "replace color & alpha", OFFSET(replace), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, FLAGS },
{ "box_source", "use datas from bounding box in side data", OFFSET(box_source_string), AV_OPT_TYPE_STRING, { .str=NULL }, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(drawbox);
static const AVFilterPad drawbox_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad drawbox_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const 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,
FILTER_INPUTS(drawbox_inputs),
FILTER_OUTPUTS(drawbox_outputs),
FILTER_QUERY_FUNC(query_formats),
.process_command = process_command,
.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;
draw_region(frame, drawgrid, 0, 0, frame->width, frame->height, pixel_belongs_to_grid);
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" }, 0, 0, FLAGS },
{ "y", "set vertical offset", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "width", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "w", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "height", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "h", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
{ "color", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
{ "c", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
{ "thickness", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, 0, 0, FLAGS },
{ "t", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, 0, 0, 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,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.config_props = config_input,
.filter_frame = drawgrid_filter_frame,
},
};
static const AVFilterPad drawgrid_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const 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,
FILTER_INPUTS(drawgrid_inputs),
FILTER_OUTPUTS(drawgrid_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
.process_command = process_command,
};
#endif /* CONFIG_DRAWGRID_FILTER */
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