yading@10: /*
yading@10:  * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Box drawing filter. Also a nice template for a filter that needs to
yading@10:  * write in the input frame.
yading@10:  */
yading@10: 
yading@10: #include "libavutil/colorspace.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/parseutils.h"
yading@10: #include "avfilter.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: 
yading@10: enum { Y, U, V, A };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     int x, y, w, h, thickness;
yading@10:     char *color_str;
yading@10:     unsigned char yuv_color[4];
yading@10:     int invert_color; ///< invert luma color
yading@10:     int vsub, hsub;   ///< chroma subsampling
yading@10: } DrawBoxContext;
yading@10: 
yading@10: static av_cold int init(AVFilterContext *ctx)
yading@10: {
yading@10:     DrawBoxContext *drawbox = ctx->priv;
yading@10:     uint8_t rgba_color[4];
yading@10: 
yading@10:     if (!strcmp(drawbox->color_str, "invert"))
yading@10:         drawbox->invert_color = 1;
yading@10:     else if (av_parse_color(rgba_color, drawbox->color_str, -1, ctx) < 0)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     if (!drawbox->invert_color) {
yading@10:         drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
yading@10:         drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
yading@10:         drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
yading@10:         drawbox->yuv_color[A] = rgba_color[3];
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     static const enum AVPixelFormat pix_fmts[] = {
yading@10:         AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
yading@10:         AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,
yading@10:         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
yading@10:         AV_PIX_FMT_YUV440P,  AV_PIX_FMT_YUVJ440P,
yading@10:         AV_PIX_FMT_NONE
yading@10:     };
yading@10: 
yading@10:     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_input(AVFilterLink *inlink)
yading@10: {
yading@10:     DrawBoxContext *drawbox = inlink->dst->priv;
yading@10:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
yading@10: 
yading@10:     drawbox->hsub = desc->log2_chroma_w;
yading@10:     drawbox->vsub = desc->log2_chroma_h;
yading@10: 
yading@10:     if (drawbox->w == 0) drawbox->w = inlink->w;
yading@10:     if (drawbox->h == 0) drawbox->h = inlink->h;
yading@10: 
yading@10:     av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
yading@10:            drawbox->x, drawbox->y, drawbox->w, drawbox->h,
yading@10:            drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
yading@10: {
yading@10:     DrawBoxContext *drawbox = inlink->dst->priv;
yading@10:     int plane, x, y, xb = drawbox->x, yb = drawbox->y;
yading@10:     unsigned char *row[4];
yading@10: 
yading@10:     for (y = FFMAX(yb, 0); y < frame->height && y < (yb + drawbox->h); y++) {
yading@10:         row[0] = frame->data[0] + y * frame->linesize[0];
yading@10: 
yading@10:         for (plane = 1; plane < 3; plane++)
yading@10:             row[plane] = frame->data[plane] +
yading@10:                  frame->linesize[plane] * (y >> drawbox->vsub);
yading@10: 
yading@10:         if (drawbox->invert_color) {
yading@10:             for (x = FFMAX(xb, 0); x < xb + drawbox->w && x < frame->width; x++)
yading@10:                 if ((y - yb < drawbox->thickness-1) || (yb + drawbox->h - y < drawbox->thickness) ||
yading@10:                     (x - xb < drawbox->thickness-1) || (xb + drawbox->w - x < drawbox->thickness))
yading@10:                     row[0][x] = 0xff - row[0][x];
yading@10:         } else {
yading@10:             for (x = FFMAX(xb, 0); x < xb + drawbox->w && x < frame->width; x++) {
yading@10:                 double alpha = (double)drawbox->yuv_color[A] / 255;
yading@10: 
yading@10:                 if ((y - yb < drawbox->thickness-1) || (yb + drawbox->h - y < drawbox->thickness) ||
yading@10:                     (x - xb < drawbox->thickness-1) || (xb + drawbox->w - x < drawbox->thickness)) {
yading@10:                     row[0][x                 ] = (1 - alpha) * row[0][x                 ] + alpha * drawbox->yuv_color[Y];
yading@10:                     row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U];
yading@10:                     row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V];
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return ff_filter_frame(inlink->dst->outputs[0], frame);
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(DrawBoxContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
yading@10: 
yading@10: static const AVOption drawbox_options[] = {
yading@10:     { "x",      "Horizontal position of the left box edge", OFFSET(x),         AV_OPT_TYPE_INT,    { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
yading@10:     { "y",      "Vertical position of the top box edge",    OFFSET(y),         AV_OPT_TYPE_INT,    { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
yading@10:     { "width",  "Width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
yading@10:     { "w",      "Width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
yading@10:     { "height", "Height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
yading@10:     { "h",      "Height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },
yading@10:     { "color",  "Color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, .flags = FLAGS },
yading@10:     { "c",      "Color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, .flags = FLAGS },
yading@10:     { "thickness",   "set the box maximum thickness",       OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
yading@10:     { "t",           "set the box maximum thickness",       OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(drawbox);
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_drawbox_inputs[] = {
yading@10:     {
yading@10:         .name             = "default",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .config_props     = config_input,
yading@10:         .get_video_buffer = ff_null_get_video_buffer,
yading@10:         .filter_frame     = filter_frame,
yading@10:         .needs_writable   = 1,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_drawbox_outputs[] = {
yading@10:     {
yading@10:         .name = "default",
yading@10:         .type = AVMEDIA_TYPE_VIDEO,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_drawbox = {
yading@10:     .name      = "drawbox",
yading@10:     .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
yading@10:     .priv_size = sizeof(DrawBoxContext),
yading@10:     .priv_class = &drawbox_class,
yading@10:     .init      = init,
yading@10: 
yading@10:     .query_formats   = query_formats,
yading@10:     .inputs    = avfilter_vf_drawbox_inputs,
yading@10:     .outputs   = avfilter_vf_drawbox_outputs,
yading@10: };