FFmpeg
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fbdev_common.c
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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 <stdlib.h>
24 #include "fbdev_common.h"
25 #include "libavutil/common.h"
26 
31 };
32 
33 static const struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = {
34  // bpp, red_offset, green_offset, blue_offset, alpha_offset, pixfmt
35  { 32, 0, 8, 16, 24, AV_PIX_FMT_RGBA },
36  { 32, 16, 8, 0, 24, AV_PIX_FMT_BGRA },
37  { 32, 8, 16, 24, 0, AV_PIX_FMT_ARGB },
38  { 32, 3, 2, 8, 0, AV_PIX_FMT_ABGR },
39  { 24, 0, 8, 16, 0, AV_PIX_FMT_RGB24 },
40  { 24, 16, 8, 0, 0, AV_PIX_FMT_BGR24 },
41  { 16, 11, 5, 0, 16, AV_PIX_FMT_RGB565 },
42 };
43 
44 enum AVPixelFormat ff_get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo)
45 {
46  int i;
47 
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 
57  return AV_PIX_FMT_NONE;
58 }
59 
61 {
62  const char *dev = getenv("FRAMEBUFFER");
63  if (!dev)
64  dev = "/dev/fb0";
65  return dev;
66 }
67