| 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, 16, 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 | } |