blob: 91bd8e1a911545b952473e5c9531a123aafefbd5
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 | |
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 | |
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 | |
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 |