fbdev_common.c 4.6 KB

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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. #include <unistd.h>
  23. #include <fcntl.h>
  24. #include <sys/ioctl.h>
  25. #include <stdlib.h>
  26. #include "fbdev_common.h"
  27. #include "libavutil/common.h"
  28. #include "libavutil/file_open.h"
  29. #include "avdevice.h"
  30. struct rgb_pixfmt_map_entry {
  31. int bits_per_pixel;
  32. int red_offset, green_offset, blue_offset, alpha_offset;
  33. enum AVPixelFormat pixfmt;
  34. };
  35. static const struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = {
  36. // bpp, red_offset, green_offset, blue_offset, alpha_offset, pixfmt
  37. { 32, 0, 8, 16, 24, AV_PIX_FMT_RGBA },
  38. { 32, 16, 8, 0, 24, AV_PIX_FMT_BGRA },
  39. { 32, 8, 16, 24, 0, AV_PIX_FMT_ARGB },
  40. { 32, 3, 2, 8, 0, AV_PIX_FMT_ABGR },
  41. { 24, 0, 8, 16, 0, AV_PIX_FMT_RGB24 },
  42. { 24, 16, 8, 0, 0, AV_PIX_FMT_BGR24 },
  43. { 16, 11, 5, 0, 0, AV_PIX_FMT_RGB565 },
  44. };
  45. enum AVPixelFormat ff_get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo)
  46. {
  47. int i;
  48. for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) {
  49. const struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i];
  50. if (entry->bits_per_pixel == varinfo->bits_per_pixel &&
  51. entry->red_offset == varinfo->red.offset &&
  52. entry->green_offset == varinfo->green.offset &&
  53. entry->blue_offset == varinfo->blue.offset)
  54. return entry->pixfmt;
  55. }
  56. return AV_PIX_FMT_NONE;
  57. }
  58. const char* ff_fbdev_default_device()
  59. {
  60. const char *dev = getenv("FRAMEBUFFER");
  61. if (!dev)
  62. dev = "/dev/fb0";
  63. return dev;
  64. }
  65. int ff_fbdev_get_device_list(AVDeviceInfoList *device_list)
  66. {
  67. struct fb_var_screeninfo varinfo;
  68. struct fb_fix_screeninfo fixinfo;
  69. char device_file[12];
  70. AVDeviceInfo *device = NULL;
  71. int i, fd, ret = 0;
  72. const char *default_device = ff_fbdev_default_device();
  73. if (!device_list)
  74. return AVERROR(EINVAL);
  75. for (i = 0; i <= 31; i++) {
  76. snprintf(device_file, sizeof(device_file), "/dev/fb%d", i);
  77. if ((fd = avpriv_open(device_file, O_RDWR)) < 0) {
  78. int err = AVERROR(errno);
  79. if (err != AVERROR(ENOENT))
  80. av_log(NULL, AV_LOG_ERROR, "Could not open framebuffer device '%s': %s\n",
  81. device_file, av_err2str(err));
  82. continue;
  83. }
  84. if (ioctl(fd, FBIOGET_VSCREENINFO, &varinfo) == -1)
  85. goto fail_device;
  86. if (ioctl(fd, FBIOGET_FSCREENINFO, &fixinfo) == -1)
  87. goto fail_device;
  88. device = av_mallocz(sizeof(AVDeviceInfo));
  89. if (!device) {
  90. ret = AVERROR(ENOMEM);
  91. goto fail_device;
  92. }
  93. device->device_name = av_strdup(device_file);
  94. device->device_description = av_strdup(fixinfo.id);
  95. if (!device->device_name || !device->device_description) {
  96. ret = AVERROR(ENOMEM);
  97. goto fail_device;
  98. }
  99. if ((ret = av_dynarray_add_nofree(&device_list->devices,
  100. &device_list->nb_devices, device)) < 0)
  101. goto fail_device;
  102. if (default_device && !strcmp(device->device_name, default_device)) {
  103. device_list->default_device = device_list->nb_devices - 1;
  104. default_device = NULL;
  105. }
  106. close(fd);
  107. continue;
  108. fail_device:
  109. if (device) {
  110. av_freep(&device->device_name);
  111. av_freep(&device->device_description);
  112. av_freep(&device);
  113. }
  114. if (fd >= 0)
  115. close(fd);
  116. if (ret < 0)
  117. return ret;
  118. }
  119. return 0;
  120. }