200 lines
7.5 KiB
C
200 lines
7.5 KiB
C
/*
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* Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
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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 drawing filter. Also a nice template for a filter that needs to
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* 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/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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enum { Y, U, V, A };
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typedef struct {
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const AVClass *class;
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int x, y, w, h, 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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} DrawBoxContext;
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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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static const AVOption drawbox_options[] = {
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{ "x", "set the box top-left corner x position", OFFSET(x), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
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{ "y", "set the box top-left corner y position", OFFSET(y), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
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{ "width", "set the box width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
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{ "w", "set the box width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
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{ "height", "set the box height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
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{ "h", "set the box height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
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{ "color", "set the box edge color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c", "set the box edge color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "thickness", "set the box maximum thickness", OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
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{ "t", "set the box maximum thickness", OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(drawbox);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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DrawBoxContext *drawbox = ctx->priv;
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uint8_t rgba_color[4];
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static const char *shorthand[] = { "x", "y", "w", "h", "color", "thickness", NULL };
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int ret;
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drawbox->class = &drawbox_class;
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av_opt_set_defaults(drawbox);
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if ((ret = av_opt_set_from_string(drawbox, args, shorthand, "=", ":")) < 0)
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return ret;
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if (!strcmp(drawbox->color_str, "invert"))
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drawbox->invert_color = 1;
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else if (av_parse_color(rgba_color, drawbox->color_str, -1, ctx) < 0)
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return AVERROR(EINVAL);
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if (!drawbox->invert_color) {
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drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
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drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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drawbox->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 av_cold void uninit(AVFilterContext *ctx)
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{
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DrawBoxContext *drawbox = ctx->priv;
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av_opt_free(drawbox);
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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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DrawBoxContext *drawbox = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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drawbox->hsub = desc->log2_chroma_w;
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drawbox->vsub = desc->log2_chroma_h;
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if (drawbox->w == 0) drawbox->w = inlink->w;
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if (drawbox->h == 0) drawbox->h = inlink->h;
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av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
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drawbox->x, drawbox->y, drawbox->w, drawbox->h,
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drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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{
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DrawBoxContext *drawbox = inlink->dst->priv;
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int plane, x, y, xb = drawbox->x, yb = drawbox->y;
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unsigned char *row[4];
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for (y = FFMAX(yb, 0); y < frame->video->h && y < (yb + drawbox->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 >> drawbox->vsub);
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if (drawbox->invert_color) {
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for (x = FFMAX(xb, 0); x < xb + drawbox->w && x < frame->video->w; x++)
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if ((y - yb < drawbox->thickness-1) || (yb + drawbox->h - y < drawbox->thickness) ||
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(x - xb < drawbox->thickness-1) || (xb + drawbox->w - x < drawbox->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 + drawbox->w && x < frame->video->w; x++) {
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double alpha = (double)drawbox->yuv_color[A] / 255;
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if ((y - yb < drawbox->thickness-1) || (yb + drawbox->h - y < drawbox->thickness) ||
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(x - xb < drawbox->thickness-1) || (xb + drawbox->w - x < drawbox->thickness)) {
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row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y];
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row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U];
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row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->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 AVFilterPad avfilter_vf_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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.get_video_buffer = ff_null_get_video_buffer,
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.filter_frame = filter_frame,
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.min_perms = AV_PERM_WRITE | AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_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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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = avfilter_vf_drawbox_inputs,
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.outputs = avfilter_vf_drawbox_outputs,
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.priv_class = &drawbox_class,
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};
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