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