Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia) 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00027 #include "libavutil/colorspace.h" 00028 #include "libavutil/pixdesc.h" 00029 #include "libavutil/parseutils.h" 00030 #include "avfilter.h" 00031 00032 enum { Y, U, V, A }; 00033 00034 typedef struct { 00035 int x, y, w, h; 00036 unsigned char yuv_color[4]; 00037 int vsub, hsub; //< chroma subsampling 00038 } DrawBoxContext; 00039 00040 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) 00041 { 00042 DrawBoxContext *drawbox= ctx->priv; 00043 char color_str[1024] = "black"; 00044 uint8_t rgba_color[4]; 00045 00046 drawbox->x = drawbox->y = drawbox->w = drawbox->h = 0; 00047 00048 if (args) 00049 sscanf(args, "%d:%d:%d:%d:%s", 00050 &drawbox->x, &drawbox->y, &drawbox->w, &drawbox->h, color_str); 00051 00052 if (av_parse_color(rgba_color, color_str, -1, ctx) < 0) 00053 return AVERROR(EINVAL); 00054 00055 drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]); 00056 drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0); 00057 drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0); 00058 drawbox->yuv_color[A] = rgba_color[3]; 00059 00060 return 0; 00061 } 00062 00063 static int query_formats(AVFilterContext *ctx) 00064 { 00065 enum PixelFormat pix_fmts[] = { 00066 PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, 00067 PIX_FMT_YUV411P, PIX_FMT_YUV410P, 00068 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, 00069 PIX_FMT_YUV440P, PIX_FMT_YUVJ440P, 00070 PIX_FMT_NONE 00071 }; 00072 00073 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 00074 return 0; 00075 } 00076 00077 static int config_input(AVFilterLink *inlink) 00078 { 00079 DrawBoxContext *drawbox = inlink->dst->priv; 00080 00081 drawbox->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w; 00082 drawbox->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h; 00083 00084 if (drawbox->w == 0) drawbox->w = inlink->w; 00085 if (drawbox->h == 0) drawbox->h = inlink->h; 00086 00087 av_log(inlink->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n", 00088 drawbox->w, drawbox->y, drawbox->w, drawbox->h, 00089 drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]); 00090 00091 return 0; 00092 } 00093 00094 static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir) 00095 { 00096 DrawBoxContext *drawbox = inlink->dst->priv; 00097 int plane, x, y, xb = drawbox->x, yb = drawbox->y; 00098 unsigned char *row[4]; 00099 AVFilterBufferRef *picref = inlink->cur_buf; 00100 00101 for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + drawbox->h); y++) { 00102 row[0] = picref->data[0] + y * picref->linesize[0]; 00103 00104 for (plane = 1; plane < 3; plane++) 00105 row[plane] = picref->data[plane] + 00106 picref->linesize[plane] * (y >> drawbox->vsub); 00107 00108 for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) { 00109 double alpha = (double)drawbox->yuv_color[A] / 255; 00110 00111 if ((y - yb < 3) || (yb + drawbox->h - y < 4) || 00112 (x - xb < 3) || (xb + drawbox->w - x < 4)) { 00113 row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y]; 00114 row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U]; 00115 row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V]; 00116 } 00117 } 00118 } 00119 00120 avfilter_draw_slice(inlink->dst->outputs[0], y0, h, 1); 00121 } 00122 00123 AVFilter avfilter_vf_drawbox = { 00124 .name = "drawbox", 00125 .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."), 00126 .priv_size = sizeof(DrawBoxContext), 00127 .init = init, 00128 00129 .query_formats = query_formats, 00130 .inputs = (AVFilterPad[]) {{ .name = "default", 00131 .type = AVMEDIA_TYPE_VIDEO, 00132 .config_props = config_input, 00133 .get_video_buffer = avfilter_null_get_video_buffer, 00134 .start_frame = avfilter_null_start_frame, 00135 .draw_slice = draw_slice, 00136 .end_frame = avfilter_null_end_frame, 00137 .min_perms = AV_PERM_WRITE | AV_PERM_READ, 00138 .rej_perms = AV_PERM_PRESERVE }, 00139 { .name = NULL}}, 00140 .outputs = (AVFilterPad[]) {{ .name = "default", 00141 .type = AVMEDIA_TYPE_VIDEO, }, 00142 { .name = NULL}}, 00143 };