1/* 2 * Copyright (c) 2010 Stefano Sabatini 3 * 4 * This file is part of Libav. 5 * 6 * Libav is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * Libav is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with Libav; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * color source 24 */ 25 26#include "avfilter.h" 27#include "libavutil/pixdesc.h" 28#include "libavutil/colorspace.h" 29#include "libavutil/imgutils.h" 30#include "libavutil/mathematics.h" 31#include "libavutil/parseutils.h" 32#include "drawutils.h" 33 34typedef struct { 35 int w, h; 36 uint8_t color[4]; 37 AVRational time_base; 38 uint8_t *line[4]; 39 int line_step[4]; 40 int hsub, vsub; ///< chroma subsampling values 41 uint64_t pts; 42} ColorContext; 43 44static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque) 45{ 46 ColorContext *color = ctx->priv; 47 char color_string[128] = "black"; 48 char frame_size [128] = "320x240"; 49 char frame_rate [128] = "25"; 50 AVRational frame_rate_q; 51 int ret; 52 53 if (args) 54 sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate); 55 56 if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) { 57 av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size); 58 return AVERROR(EINVAL); 59 } 60 61 if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 || 62 frame_rate_q.den <= 0 || frame_rate_q.num <= 0) { 63 av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate); 64 return AVERROR(EINVAL); 65 } 66 color->time_base.num = frame_rate_q.den; 67 color->time_base.den = frame_rate_q.num; 68 69 if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0) 70 return ret; 71 72 return 0; 73} 74 75static av_cold void color_uninit(AVFilterContext *ctx) 76{ 77 ColorContext *color = ctx->priv; 78 int i; 79 80 for (i = 0; i < 4; i++) { 81 av_freep(&color->line[i]); 82 color->line_step[i] = 0; 83 } 84} 85 86static int query_formats(AVFilterContext *ctx) 87{ 88 static const enum PixelFormat pix_fmts[] = { 89 PIX_FMT_ARGB, PIX_FMT_RGBA, 90 PIX_FMT_ABGR, PIX_FMT_BGRA, 91 PIX_FMT_RGB24, PIX_FMT_BGR24, 92 93 PIX_FMT_YUV444P, PIX_FMT_YUV422P, 94 PIX_FMT_YUV420P, PIX_FMT_YUV411P, 95 PIX_FMT_YUV410P, PIX_FMT_YUV440P, 96 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, 97 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P, 98 PIX_FMT_YUVA420P, 99 100 PIX_FMT_NONE 101 }; 102 103 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 104 return 0; 105} 106 107static int color_config_props(AVFilterLink *inlink) 108{ 109 AVFilterContext *ctx = inlink->src; 110 ColorContext *color = ctx->priv; 111 uint8_t rgba_color[4]; 112 int is_packed_rgba; 113 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; 114 115 color->hsub = pix_desc->log2_chroma_w; 116 color->vsub = pix_desc->log2_chroma_h; 117 118 color->w &= ~((1 << color->hsub) - 1); 119 color->h &= ~((1 << color->vsub) - 1); 120 if (av_image_check_size(color->w, color->h, 0, ctx) < 0) 121 return AVERROR(EINVAL); 122 123 memcpy(rgba_color, color->color, sizeof(rgba_color)); 124 ff_fill_line_with_color(color->line, color->line_step, color->w, color->color, 125 inlink->format, rgba_color, &is_packed_rgba, NULL); 126 127 av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n", 128 color->w, color->h, color->time_base.den, color->time_base.num, 129 color->color[0], color->color[1], color->color[2], color->color[3], 130 is_packed_rgba ? "rgba" : "yuva"); 131 inlink->w = color->w; 132 inlink->h = color->h; 133 inlink->time_base = color->time_base; 134 135 return 0; 136} 137 138static int color_request_frame(AVFilterLink *link) 139{ 140 ColorContext *color = link->src->priv; 141 AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h); 142 picref->video->pixel_aspect = (AVRational) {1, 1}; 143 picref->pts = color->pts++; 144 picref->pos = -1; 145 146 avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0)); 147 ff_draw_rectangle(picref->data, picref->linesize, 148 color->line, color->line_step, color->hsub, color->vsub, 149 0, 0, color->w, color->h); 150 avfilter_draw_slice(link, 0, color->h, 1); 151 avfilter_end_frame(link); 152 avfilter_unref_buffer(picref); 153 154 return 0; 155} 156 157AVFilter avfilter_vsrc_color = { 158 .name = "color", 159 .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"), 160 161 .priv_size = sizeof(ColorContext), 162 .init = color_init, 163 .uninit = color_uninit, 164 165 .query_formats = query_formats, 166 167 .inputs = (AVFilterPad[]) {{ .name = NULL}}, 168 169 .outputs = (AVFilterPad[]) {{ .name = "default", 170 .type = AVMEDIA_TYPE_VIDEO, 171 .request_frame = color_request_frame, 172 .config_props = color_config_props }, 173 { .name = NULL}}, 174}; 175