libavfilter/vsrc_color.c

   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 <stdio.h>
  27 #include <string.h>
  28
  29 #include "avfilter.h"
  30 #include "formats.h"
  31 #include "internal.h"
  32 #include "video.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "libavutil/colorspace.h"
  35 #include "libavutil/imgutils.h"
  36 #include "libavutil/internal.h"
  37 #include "libavutil/mathematics.h"
  38 #include "libavutil/mem.h"
  39 #include "libavutil/parseutils.h"
  40 #include "drawutils.h"
  41
  42 typedef struct {
  43     int w, h;
  44     uint8_t color[4];
  45     AVRational time_base;
  46     uint8_t *line[4];
  47     int      line_step[4];
  48     int hsub, vsub;         ///< chroma subsampling values
  49     uint64_t pts;
  50 } ColorContext;
  51
  52 static av_cold int color_init(AVFilterContext *ctx, const char *args)
  53 {
  54     ColorContext *color = ctx->priv;
  55     char color_string[128] = "black";
  56     char frame_size  [128] = "320x240";
  57     char frame_rate  [128] = "25";
  58     AVRational frame_rate_q;
  59     int ret;
  60
  61     if (args)
  62         sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
  63
  64     if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
  65         av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
  66         return AVERROR(EINVAL);
  67     }
  68
  69     if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
  70         frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
  71         av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
  72         return AVERROR(EINVAL);
  73     }
  74     color->time_base.num = frame_rate_q.den;
  75     color->time_base.den = frame_rate_q.num;
  76
  77     if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0)
  78         return ret;
  79
  80     return 0;
  81 }
  82
  83 static av_cold void color_uninit(AVFilterContext *ctx)
  84 {
  85     ColorContext *color = ctx->priv;
  86     int i;
  87
  88     for (i = 0; i < 4; i++) {
  89         av_freep(&color->line[i]);
  90         color->line_step[i] = 0;
  91     }
  92 }
  93
  94 static int query_formats(AVFilterContext *ctx)
  95 {
  96     static const enum AVPixelFormat pix_fmts[] = {
  97         AV_PIX_FMT_ARGB,         AV_PIX_FMT_RGBA,
  98         AV_PIX_FMT_ABGR,         AV_PIX_FMT_BGRA,
  99         AV_PIX_FMT_RGB24,        AV_PIX_FMT_BGR24,
 100
 101         AV_PIX_FMT_YUV444P,      AV_PIX_FMT_YUV422P,
 102         AV_PIX_FMT_YUV420P,      AV_PIX_FMT_YUV411P,
 103         AV_PIX_FMT_YUV410P,      AV_PIX_FMT_YUV440P,
 104         AV_PIX_FMT_YUVJ444P,     AV_PIX_FMT_YUVJ422P,
 105         AV_PIX_FMT_YUVJ420P,     AV_PIX_FMT_YUVJ440P,
 106         AV_PIX_FMT_YUVA420P,
 107
 108         AV_PIX_FMT_NONE
 109     };
 110
 111     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
 112     return 0;
 113 }
 114
 115 static int color_config_props(AVFilterLink *inlink)
 116 {
 117     AVFilterContext *ctx = inlink->src;
 118     ColorContext *color = ctx->priv;
 119     uint8_t rgba_color[4];
 120     int is_packed_rgba;
 121     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
 122
 123     color->hsub = pix_desc->log2_chroma_w;
 124     color->vsub = pix_desc->log2_chroma_h;
 125
 126     color->w &= ~((1 << color->hsub) - 1);
 127     color->h &= ~((1 << color->vsub) - 1);
 128     if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
 129         return AVERROR(EINVAL);
 130
 131     memcpy(rgba_color, color->color, sizeof(rgba_color));
 132     ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
 133                             inlink->format, rgba_color, &is_packed_rgba, NULL);
 134
 135     av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
 136            color->w, color->h, color->time_base.den, color->time_base.num,
 137            color->color[0], color->color[1], color->color[2], color->color[3],
 138            is_packed_rgba ? "rgba" : "yuva");
 139     inlink->w = color->w;
 140     inlink->h = color->h;
 141     inlink->time_base = color->time_base;
 142
 143     return 0;
 144 }
 145
 146 static int color_request_frame(AVFilterLink *link)
 147 {
 148     ColorContext *color = link->src->priv;
 149     AVFilterBufferRef *picref = ff_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
 150
 151     if (!picref)
 152         return AVERROR(ENOMEM);
 153
 154     picref->video->pixel_aspect = (AVRational) {1, 1};
 155     picref->pts                 = color->pts++;
 156     picref->pos                 = -1;
 157
 158     ff_draw_rectangle(picref->data, picref->linesize,
 159                       color->line, color->line_step, color->hsub, color->vsub,
 160                       0, 0, color->w, color->h);
 161     return ff_filter_frame(link, picref);
 162 }
 163
 164 static const AVFilterPad avfilter_vsrc_color_outputs[] = {
 165     {
 166         .name          = "default",
 167         .type          = AVMEDIA_TYPE_VIDEO,
 168         .request_frame = color_request_frame,
 169         .config_props  = color_config_props
 170     },
 171     { NULL }
 172 };
 173
 174 AVFilter avfilter_vsrc_color = {
 175     .name        = "color",
 176     .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
 177
 178     .priv_size = sizeof(ColorContext),
 179     .init      = color_init,
 180     .uninit    = color_uninit,
 181
 182     .query_formats = query_formats,
 183
 184     .inputs    = NULL,
 185
 186     .outputs   = avfilter_vsrc_color_outputs,
 187 };