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utils.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "avutil.h"
21 #include "avassert.h"
22 #include "samplefmt.h"
23 #include "pixdesc.h"
24 
25 /**
26  * @file
27  * various utility functions
28  */
29 
30 #include "libavutil/ffversion.h"
31 const char av_util_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
32 
33 unsigned avutil_version(void)
34 {
35  static int checks_done;
36  if (checks_done)
37  return LIBAVUTIL_VERSION_INT;
38 
39  av_assert0(AV_PIX_FMT_VDA_VLD == 81); //check if the pix fmt enum has not had anything inserted or removed by mistake
44  av_assert0(HAVE_MMX2 == HAVE_MMXEXT);
45 
46  av_assert0(((size_t)-1) > 0); // C guarantees this but if false on a platform we care about revert at least b284e1ffe343d6697fb950d1ee517bafda8a9844
47 
48  if (av_sat_dadd32(1, 2) != 5) {
49  av_log(NULL, AV_LOG_FATAL, "Libavutil has been build with a broken binutils, please upgrade binutils and rebuild\n");
50  abort();
51  }
52 
53  if (llrint(1LL<<60) != 1LL<<60) {
54  av_log(NULL, AV_LOG_ERROR, "Libavutil has been linked to a broken llrint()\n");
55  }
56 
57 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 0
59 #endif
60  checks_done = 1;
61  return LIBAVUTIL_VERSION_INT;
62 }
63 
64 const char *avutil_configuration(void)
65 {
66  return FFMPEG_CONFIGURATION;
67 }
68 
69 const char *avutil_license(void)
70 {
71 #define LICENSE_PREFIX "libavutil license: "
72  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
73 }
74 
75 const char *av_get_media_type_string(enum AVMediaType media_type)
76 {
77  switch (media_type) {
78  case AVMEDIA_TYPE_VIDEO: return "video";
79  case AVMEDIA_TYPE_AUDIO: return "audio";
80  case AVMEDIA_TYPE_DATA: return "data";
81  case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
82  case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
83  default: return NULL;
84  }
85 }
86 
88 {
89  switch (pict_type) {
90  case AV_PICTURE_TYPE_I: return 'I';
91  case AV_PICTURE_TYPE_P: return 'P';
92  case AV_PICTURE_TYPE_B: return 'B';
93  case AV_PICTURE_TYPE_S: return 'S';
94  case AV_PICTURE_TYPE_SI: return 'i';
95  case AV_PICTURE_TYPE_SP: return 'p';
96  case AV_PICTURE_TYPE_BI: return 'b';
97  default: return '?';
98  }
99 }
100 
101 unsigned av_int_list_length_for_size(unsigned elsize,
102  const void *list, uint64_t term)
103 {
104  unsigned i;
105 
106  if (!list)
107  return 0;
108 #define LIST_LENGTH(type) \
109  { type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
110  switch (elsize) {
111  case 1: LIST_LENGTH(uint8_t); break;
112  case 2: LIST_LENGTH(uint16_t); break;
113  case 4: LIST_LENGTH(uint32_t); break;
114  case 8: LIST_LENGTH(uint64_t); break;
115  default: av_assert0(!"valid element size");
116  }
117  return i;
118 }
119 
121 {
122  return (AVRational){1, AV_TIME_BASE};
123 }