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  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.