| /* |
| * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia) |
| * |
| * 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 drawing filter. Also a nice template for a filter that needs to |
| * write in the input frame. |
| */ |
| |
| #include "libavutil/colorspace.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavutil/parseutils.h" |
| #include "avfilter.h" |
| |
| enum { Y, U, V, A }; |
| |
| typedef struct { |
| int x, y, w, h; |
| unsigned char yuv_color[4]; |
| int vsub, hsub; //< chroma subsampling |
| } DrawBoxContext; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| DrawBoxContext *drawbox= ctx->priv; |
| char color_str[1024] = "black"; |
| uint8_t rgba_color[4]; |
| |
| drawbox->x = drawbox->y = drawbox->w = drawbox->h = 0; |
| |
| if (args) |
| sscanf(args, "%d:%d:%d:%d:%s", |
| &drawbox->x, &drawbox->y, &drawbox->w, &drawbox->h, color_str); |
| |
| if (av_parse_color(rgba_color, color_str, -1, ctx) < 0) |
| return AVERROR(EINVAL); |
| |
| drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]); |
| drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0); |
| drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0); |
| drawbox->yuv_color[A] = rgba_color[3]; |
| |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| enum PixelFormat pix_fmts[] = { |
| PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, |
| PIX_FMT_YUV411P, PIX_FMT_YUV410P, |
| PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, |
| PIX_FMT_YUV440P, PIX_FMT_YUVJ440P, |
| PIX_FMT_NONE |
| }; |
| |
| avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| return 0; |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| DrawBoxContext *drawbox = inlink->dst->priv; |
| |
| drawbox->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w; |
| drawbox->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h; |
| |
| if (drawbox->w == 0) drawbox->w = inlink->w; |
| if (drawbox->h == 0) drawbox->h = inlink->h; |
| |
| av_log(inlink->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n", |
| drawbox->w, drawbox->y, drawbox->w, drawbox->h, |
| drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]); |
| |
| return 0; |
| } |
| |
| static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir) |
| { |
| DrawBoxContext *drawbox = inlink->dst->priv; |
| int plane, x, y, xb = drawbox->x, yb = drawbox->y; |
| unsigned char *row[4]; |
| AVFilterBufferRef *picref = inlink->cur_buf; |
| |
| for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + drawbox->h); y++) { |
| row[0] = picref->data[0] + y * picref->linesize[0]; |
| |
| for (plane = 1; plane < 3; plane++) |
| row[plane] = picref->data[plane] + |
| picref->linesize[plane] * (y >> drawbox->vsub); |
| |
| for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) { |
| double alpha = (double)drawbox->yuv_color[A] / 255; |
| |
| if ((y - yb < 3) || (yb + drawbox->h - y < 4) || |
| (x - xb < 3) || (xb + drawbox->w - x < 4)) { |
| row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y]; |
| row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U]; |
| row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V]; |
| } |
| } |
| } |
| |
| avfilter_draw_slice(inlink->dst->outputs[0], y0, h, 1); |
| } |
| |
| AVFilter avfilter_vf_drawbox = { |
| .name = "drawbox", |
| .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."), |
| .priv_size = sizeof(DrawBoxContext), |
| .init = init, |
| |
| .query_formats = query_formats, |
| .inputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input, |
| .get_video_buffer = avfilter_null_get_video_buffer, |
| .start_frame = avfilter_null_start_frame, |
| .draw_slice = draw_slice, |
| .end_frame = avfilter_null_end_frame, |
| .min_perms = AV_PERM_WRITE | AV_PERM_READ, |
| .rej_perms = AV_PERM_PRESERVE }, |
| { .name = NULL}}, |
| .outputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |