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