diff options
Diffstat (limited to 'libavdevice/fbdev_common.c')
| -rw-r--r-- | libavdevice/fbdev_common.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libavdevice/fbdev_common.c b/libavdevice/fbdev_common.c new file mode 100644 index 0000000000..98f96de2af --- /dev/null +++ b/libavdevice/fbdev_common.c @@ -0,0 +1,134 @@ +/* + * Copyright (c) 2011 Stefano Sabatini + * Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com> + * Copyright (C) 2002 Gunnar Monell <gmo@linux.nu> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <unistd.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <stdlib.h> +#include "fbdev_common.h" +#include "libavutil/common.h" +#include "avdevice.h" + +struct rgb_pixfmt_map_entry { + int bits_per_pixel; + int red_offset, green_offset, blue_offset, alpha_offset; + enum AVPixelFormat pixfmt; +}; + +static const struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = { + // bpp, red_offset, green_offset, blue_offset, alpha_offset, pixfmt + { 32, 0, 8, 16, 24, AV_PIX_FMT_RGBA }, + { 32, 16, 8, 0, 24, AV_PIX_FMT_BGRA }, + { 32, 8, 16, 24, 0, AV_PIX_FMT_ARGB }, + { 32, 3, 2, 8, 0, AV_PIX_FMT_ABGR }, + { 24, 0, 8, 16, 0, AV_PIX_FMT_RGB24 }, + { 24, 16, 8, 0, 0, AV_PIX_FMT_BGR24 }, + { 16, 11, 5, 0, 16, AV_PIX_FMT_RGB565 }, +}; + +enum AVPixelFormat ff_get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo) +{ + int i; + + for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) { + const struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i]; + if (entry->bits_per_pixel == varinfo->bits_per_pixel && + entry->red_offset == varinfo->red.offset && + entry->green_offset == varinfo->green.offset && + entry->blue_offset == varinfo->blue.offset) + return entry->pixfmt; + } + + return AV_PIX_FMT_NONE; +} + +const char* ff_fbdev_default_device() +{ + const char *dev = getenv("FRAMEBUFFER"); + if (!dev) + dev = "/dev/fb0"; + return dev; +} + +int ff_fbdev_get_device_list(AVDeviceInfoList *device_list) +{ + struct fb_var_screeninfo varinfo; + struct fb_fix_screeninfo fixinfo; + char device_file[12]; + AVDeviceInfo *device = NULL; + int i, fd, ret = 0; + const char *default_device = ff_fbdev_default_device(); + + if (!device_list) + return AVERROR(EINVAL); + + for (i = 0; i <= 31; i++) { + snprintf(device_file, sizeof(device_file), "/dev/fb%d", i); + + if ((fd = avpriv_open(device_file, O_RDWR)) < 0) { + int err = AVERROR(errno); + if (err != AVERROR(ENOENT)) + av_log(NULL, AV_LOG_ERROR, "Could not open framebuffer device '%s': %s\n", + device_file, av_err2str(err)); + continue; + } + if (ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) == -1) + goto fail_device; + if (ioctl(fd, FBIOGET_FSCREENINFO, &fixinfo) == -1) + goto fail_device; + + device = av_mallocz(sizeof(AVDeviceInfo)); + if (!device) { + ret = AVERROR(ENOMEM); + goto fail_device; + } + device->device_name = av_strdup(device_file); + device->device_description = av_strdup(fixinfo.id); + if (!device->device_name || !device->device_description) { + ret = AVERROR(ENOMEM); + goto fail_device; + } + + if ((ret = av_dynarray_add_nofree(&device_list->devices, + &device_list->nb_devices, device)) < 0) + goto fail_device; + + if (default_device && !strcmp(device->device_name, default_device)) { + device_list->default_device = device_list->nb_devices - 1; + default_device = NULL; + } + close(fd); + continue; + + fail_device: + if (device) { + av_freep(&device->device_name); + av_freep(&device->device_description); + av_freep(&device); + } + if (fd >= 0) + close(fd); + if (ret < 0) + return ret; + } + return 0; +} |