394 lines
15 KiB
C
394 lines
15 KiB
C
/*
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* Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
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* Copyright (c) 2013 Andrey Utkin <andrey.krieger.utkin gmail com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Box and grid drawing filters. Also a nice template for a filter
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* that needs to write in the input frame.
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*/
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#include "libavutil/colorspace.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/parseutils.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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static const char *const var_names[] = {
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"dar",
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"hsub", "vsub",
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"in_h", "ih", ///< height of the input video
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"in_w", "iw", ///< width of the input video
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"sar",
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"x",
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"y",
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"h", ///< height of the rendered box
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"w", ///< width of the rendered box
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"t",
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NULL
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};
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enum { Y, U, V, A };
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enum var_name {
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VAR_DAR,
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VAR_HSUB, VAR_VSUB,
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VAR_IN_H, VAR_IH,
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VAR_IN_W, VAR_IW,
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VAR_SAR,
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VAR_X,
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VAR_Y,
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VAR_H,
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VAR_W,
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VAR_T,
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VARS_NB
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};
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typedef struct {
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const AVClass *class;
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int x, y, w, h;
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int thickness;
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char *color_str;
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unsigned char yuv_color[4];
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int invert_color; ///< invert luma color
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int vsub, hsub; ///< chroma subsampling
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char *x_expr, *y_expr; ///< expression for x and y
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char *w_expr, *h_expr; ///< expression for width and height
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char *t_expr; ///< expression for thickness
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} DrawBoxContext;
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static const int NUM_EXPR_EVALS = 5;
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static av_cold int init(AVFilterContext *ctx)
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{
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DrawBoxContext *s = ctx->priv;
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uint8_t rgba_color[4];
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if (!strcmp(s->color_str, "invert"))
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s->invert_color = 1;
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else if (av_parse_color(rgba_color, s->color_str, -1, ctx) < 0)
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return AVERROR(EINVAL);
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if (!s->invert_color) {
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s->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
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s->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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s->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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s->yuv_color[A] = rgba_color[3];
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}
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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DrawBoxContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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double var_values[VARS_NB], res;
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char *expr;
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int ret;
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int i;
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s->hsub = desc->log2_chroma_w;
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s->vsub = desc->log2_chroma_h;
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var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
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var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
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var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
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var_values[VAR_DAR] = (double)inlink->w / inlink->h * var_values[VAR_SAR];
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var_values[VAR_HSUB] = s->hsub;
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var_values[VAR_VSUB] = s->vsub;
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var_values[VAR_X] = NAN;
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var_values[VAR_Y] = NAN;
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var_values[VAR_H] = NAN;
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var_values[VAR_W] = NAN;
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var_values[VAR_T] = NAN;
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for (i = 0; i <= NUM_EXPR_EVALS; i++) {
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/* evaluate expressions, fail on last iteration */
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
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goto fail;
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s->x = var_values[VAR_X] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
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goto fail;
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s->y = var_values[VAR_Y] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
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goto fail;
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s->w = var_values[VAR_W] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
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goto fail;
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s->h = var_values[VAR_H] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->t_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
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goto fail;
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s->thickness = var_values[VAR_T] = res;
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}
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/* if w or h are zero, use the input w/h */
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s->w = (s->w > 0) ? s->w : inlink->w;
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s->h = (s->h > 0) ? s->h : inlink->h;
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/* sanity check width and height */
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if (s->w < 0 || s->h < 0) {
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av_log(ctx, AV_LOG_ERROR, "Size values less than 0 are not acceptable.\n");
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return AVERROR(EINVAL);
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}
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av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
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s->x, s->y, s->w, s->h,
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s->yuv_color[Y], s->yuv_color[U], s->yuv_color[V], s->yuv_color[A]);
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return 0;
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fail:
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av_log(ctx, AV_LOG_ERROR,
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"Error when evaluating the expression '%s'.\n",
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expr);
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return ret;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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DrawBoxContext *s = inlink->dst->priv;
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int plane, x, y, xb = s->x, yb = s->y;
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unsigned char *row[4];
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for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) {
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row[0] = frame->data[0] + y * frame->linesize[0];
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for (plane = 1; plane < 3; plane++)
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row[plane] = frame->data[plane] +
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frame->linesize[plane] * (y >> s->vsub);
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if (s->invert_color) {
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for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++)
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if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
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(x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness))
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row[0][x] = 0xff - row[0][x];
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} else {
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for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) {
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double alpha = (double)s->yuv_color[A] / 255;
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if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
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(x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness)) {
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row[0][x ] = (1 - alpha) * row[0][x ] + alpha * s->yuv_color[Y];
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row[1][x >> s->hsub] = (1 - alpha) * row[1][x >> s->hsub] + alpha * s->yuv_color[U];
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row[2][x >> s->hsub] = (1 - alpha) * row[2][x >> s->hsub] + alpha * s->yuv_color[V];
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}
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}
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}
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(DrawBoxContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#if CONFIG_DRAWBOX_FILTER
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static const AVOption drawbox_options[] = {
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{ "x", "set horizontal position of the left box edge", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "y", "set vertical position of the top box edge", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "width", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "w", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "height", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "h", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "color", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "thickness", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "t", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(drawbox);
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static const AVFilterPad drawbox_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad drawbox_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_drawbox = {
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.name = "drawbox",
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.description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
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.priv_size = sizeof(DrawBoxContext),
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.priv_class = &drawbox_class,
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.init = init,
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.query_formats = query_formats,
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.inputs = drawbox_inputs,
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.outputs = drawbox_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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#endif /* CONFIG_DRAWBOX_FILTER */
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#if CONFIG_DRAWGRID_FILTER
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static av_pure av_always_inline int pixel_belongs_to_grid(DrawBoxContext *drawgrid, int x, int y)
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{
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// x is horizontal (width) coord,
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// y is vertical (height) coord
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int x_modulo;
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int y_modulo;
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// Abstract from the offset
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x -= drawgrid->x;
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y -= drawgrid->y;
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x_modulo = x % drawgrid->w;
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y_modulo = y % drawgrid->h;
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// If x or y got negative, fix values to preserve logics
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if (x_modulo < 0)
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x_modulo += drawgrid->w;
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if (y_modulo < 0)
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y_modulo += drawgrid->h;
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return x_modulo < drawgrid->thickness // Belongs to vertical line
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|| y_modulo < drawgrid->thickness; // Belongs to horizontal line
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}
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static int drawgrid_filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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DrawBoxContext *drawgrid = inlink->dst->priv;
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int plane, x, y;
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uint8_t *row[4];
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for (y = 0; y < frame->height; y++) {
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row[0] = frame->data[0] + y * frame->linesize[0];
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for (plane = 1; plane < 3; plane++)
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row[plane] = frame->data[plane] +
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frame->linesize[plane] * (y >> drawgrid->vsub);
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if (drawgrid->invert_color) {
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for (x = 0; x < frame->width; x++)
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if (pixel_belongs_to_grid(drawgrid, x, y))
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row[0][x] = 0xff - row[0][x];
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} else {
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for (x = 0; x < frame->width; x++) {
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double alpha = (double)drawgrid->yuv_color[A] / 255;
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if (pixel_belongs_to_grid(drawgrid, x, y)) {
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row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawgrid->yuv_color[Y];
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row[1][x >> drawgrid->hsub] = (1 - alpha) * row[1][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[U];
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row[2][x >> drawgrid->hsub] = (1 - alpha) * row[2][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[V];
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}
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}
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}
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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static const AVOption drawgrid_options[] = {
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{ "x", "set horizontal offset", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "y", "set vertical offset", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "width", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "w", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "height", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "h", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "color", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "thickness", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "t", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(drawgrid);
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static const AVFilterPad drawgrid_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = drawgrid_filter_frame,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad drawgrid_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_drawgrid = {
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.name = "drawgrid",
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.description = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."),
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.priv_size = sizeof(DrawBoxContext),
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.priv_class = &drawgrid_class,
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.init = init,
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.query_formats = query_formats,
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.inputs = drawgrid_inputs,
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.outputs = drawgrid_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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#endif /* CONFIG_DRAWGRID_FILTER */
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