Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2010 Stefano Sabatini 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 00021 #include "avfilter.h" 00022 #include "libavutil/pixdesc.h" 00023 #include "libavutil/colorspace.h" 00024 #include "libavutil/imgutils.h" 00025 #include "libavutil/parseutils.h" 00026 #include "drawutils.h" 00027 00028 typedef struct { 00029 int w, h; 00030 uint8_t color[4]; 00031 AVRational time_base; 00032 uint8_t *line[4]; 00033 int line_step[4]; 00034 int hsub, vsub; 00035 uint64_t pts; 00036 } ColorContext; 00037 00038 static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque) 00039 { 00040 ColorContext *color = ctx->priv; 00041 char color_string[128] = "black"; 00042 char frame_size [128] = "320x240"; 00043 char frame_rate [128] = "25"; 00044 AVRational frame_rate_q; 00045 int ret; 00046 00047 if (args) 00048 sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate); 00049 00050 if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) { 00051 av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size); 00052 return AVERROR(EINVAL); 00053 } 00054 00055 if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 || 00056 frame_rate_q.den <= 0 || frame_rate_q.num <= 0) { 00057 av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate); 00058 return AVERROR(EINVAL); 00059 } 00060 color->time_base.num = frame_rate_q.den; 00061 color->time_base.den = frame_rate_q.num; 00062 00063 if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0) 00064 return ret; 00065 00066 return 0; 00067 } 00068 00069 static av_cold void color_uninit(AVFilterContext *ctx) 00070 { 00071 ColorContext *color = ctx->priv; 00072 int i; 00073 00074 for (i = 0; i < 4; i++) { 00075 av_freep(&color->line[i]); 00076 color->line_step[i] = 0; 00077 } 00078 } 00079 00080 static int query_formats(AVFilterContext *ctx) 00081 { 00082 static const enum PixelFormat pix_fmts[] = { 00083 PIX_FMT_ARGB, PIX_FMT_RGBA, 00084 PIX_FMT_ABGR, PIX_FMT_BGRA, 00085 PIX_FMT_RGB24, PIX_FMT_BGR24, 00086 00087 PIX_FMT_YUV444P, PIX_FMT_YUV422P, 00088 PIX_FMT_YUV420P, PIX_FMT_YUV411P, 00089 PIX_FMT_YUV410P, PIX_FMT_YUV440P, 00090 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, 00091 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P, 00092 PIX_FMT_YUVA420P, 00093 00094 PIX_FMT_NONE 00095 }; 00096 00097 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 00098 return 0; 00099 } 00100 00101 static int color_config_props(AVFilterLink *inlink) 00102 { 00103 AVFilterContext *ctx = inlink->src; 00104 ColorContext *color = ctx->priv; 00105 uint8_t rgba_color[4]; 00106 int is_packed_rgba; 00107 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; 00108 00109 color->hsub = pix_desc->log2_chroma_w; 00110 color->vsub = pix_desc->log2_chroma_h; 00111 00112 color->w &= ~((1 << color->hsub) - 1); 00113 color->h &= ~((1 << color->vsub) - 1); 00114 if (av_image_check_size(color->w, color->h, 0, ctx) < 0) 00115 return AVERROR(EINVAL); 00116 00117 memcpy(rgba_color, color->color, sizeof(rgba_color)); 00118 ff_fill_line_with_color(color->line, color->line_step, color->w, color->color, 00119 inlink->format, rgba_color, &is_packed_rgba, NULL); 00120 00121 av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n", 00122 color->w, color->h, color->time_base.den, color->time_base.num, 00123 color->color[0], color->color[1], color->color[2], color->color[3], 00124 is_packed_rgba ? "rgba" : "yuva"); 00125 inlink->w = color->w; 00126 inlink->h = color->h; 00127 00128 return 0; 00129 } 00130 00131 static int color_request_frame(AVFilterLink *link) 00132 { 00133 ColorContext *color = link->src->priv; 00134 AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h); 00135 picref->video->pixel_aspect = (AVRational) {1, 1}; 00136 picref->pts = av_rescale_q(color->pts++, color->time_base, AV_TIME_BASE_Q); 00137 picref->pos = 0; 00138 00139 avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0)); 00140 ff_draw_rectangle(picref->data, picref->linesize, 00141 color->line, color->line_step, color->hsub, color->vsub, 00142 0, 0, color->w, color->h); 00143 avfilter_draw_slice(link, 0, color->h, 1); 00144 avfilter_end_frame(link); 00145 avfilter_unref_buffer(picref); 00146 00147 return 0; 00148 } 00149 00150 AVFilter avfilter_vsrc_color = { 00151 .name = "color", 00152 .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"), 00153 00154 .priv_size = sizeof(ColorContext), 00155 .init = color_init, 00156 .uninit = color_uninit, 00157 00158 .query_formats = query_formats, 00159 00160 .inputs = (AVFilterPad[]) {{ .name = NULL}}, 00161 00162 .outputs = (AVFilterPad[]) {{ .name = "default", 00163 .type = AVMEDIA_TYPE_VIDEO, 00164 .request_frame = color_request_frame, 00165 .config_props = color_config_props }, 00166 { .name = NULL}}, 00167 };