1 /*
2 * Copyright (c) 2011 Stefano Sabatini
3 * Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com>
4 * Copyright (C) 2002 Gunnar Monell <gmo@linux.nu>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <unistd.h>
24 #include <fcntl.h>
25 #include <sys/ioctl.h>
26 #include <stdlib.h>
27 #include "fbdev_common.h"
28 #include "libavutil/common.h"
29 #include "avdevice.h"
30
31 struct rgb_pixfmt_map_entry {
32 int bits_per_pixel;
33 int red_offset, green_offset, blue_offset, alpha_offset;
34 enum AVPixelFormat pixfmt;
35 };
36
37 static const struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = {
38 // bpp, red_offset, green_offset, blue_offset, alpha_offset, pixfmt
39 { 32, 0, 8, 16, 24, AV_PIX_FMT_RGBA },
40 { 32, 16, 8, 0, 24, AV_PIX_FMT_BGRA },
41 { 32, 8, 16, 24, 0, AV_PIX_FMT_ARGB },
42 { 32, 3, 2, 8, 0, AV_PIX_FMT_ABGR },
43 { 24, 0, 8, 16, 0, AV_PIX_FMT_RGB24 },
44 { 24, 16, 8, 0, 0, AV_PIX_FMT_BGR24 },
45 { 16, 11, 5, 0, 0, AV_PIX_FMT_RGB565 },
46 };
47
ff_get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo * varinfo)48 enum AVPixelFormat ff_get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo)
49 {
50 int i;
51
52 for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) {
53 const struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i];
54 if (entry->bits_per_pixel == varinfo->bits_per_pixel &&
55 entry->red_offset == varinfo->red.offset &&
56 entry->green_offset == varinfo->green.offset &&
57 entry->blue_offset == varinfo->blue.offset)
58 return entry->pixfmt;
59 }
60
61 return AV_PIX_FMT_NONE;
62 }
63
ff_fbdev_default_device()64 const char* ff_fbdev_default_device()
65 {
66 const char *dev = getenv("FRAMEBUFFER");
67 if (!dev)
68 dev = "/dev/fb0";
69 return dev;
70 }
71
ff_fbdev_get_device_list(AVDeviceInfoList * device_list)72 int ff_fbdev_get_device_list(AVDeviceInfoList *device_list)
73 {
74 struct fb_var_screeninfo varinfo;
75 struct fb_fix_screeninfo fixinfo;
76 char device_file[12];
77 AVDeviceInfo *device = NULL;
78 int i, fd, ret = 0;
79 const char *default_device = ff_fbdev_default_device();
80
81 if (!device_list)
82 return AVERROR(EINVAL);
83
84 for (i = 0; i <= 31; i++) {
85 snprintf(device_file, sizeof(device_file), "/dev/fb%d", i);
86
87 if ((fd = avpriv_open(device_file, O_RDWR)) < 0) {
88 int err = AVERROR(errno);
89 if (err != AVERROR(ENOENT))
90 av_log(NULL, AV_LOG_ERROR, "Could not open framebuffer device '%s': %s\n",
91 device_file, av_err2str(err));
92 continue;
93 }
94 if (ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) == -1)
95 goto fail_device;
96 if (ioctl(fd, FBIOGET_FSCREENINFO, &fixinfo) == -1)
97 goto fail_device;
98
99 device = av_mallocz(sizeof(AVDeviceInfo));
100 if (!device) {
101 ret = AVERROR(ENOMEM);
102 goto fail_device;
103 }
104 device->device_name = av_strdup(device_file);
105 device->device_description = av_strdup(fixinfo.id);
106 if (!device->device_name || !device->device_description) {
107 ret = AVERROR(ENOMEM);
108 goto fail_device;
109 }
110
111 if ((ret = av_dynarray_add_nofree(&device_list->devices,
112 &device_list->nb_devices, device)) < 0)
113 goto fail_device;
114
115 if (default_device && !strcmp(device->device_name, default_device)) {
116 device_list->default_device = device_list->nb_devices - 1;
117 default_device = NULL;
118 }
119 close(fd);
120 continue;
121
122 fail_device:
123 if (device) {
124 av_freep(&device->device_name);
125 av_freep(&device->device_description);
126 av_freep(&device);
127 }
128 if (fd >= 0)
129 close(fd);
130 if (ret < 0)
131 return ret;
132 }
133 return 0;
134 }
135