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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 unsigned avutil_version(void)
31 {
32  static int checks_done;
33  if (checks_done)
34  return LIBAVUTIL_VERSION_INT;
35 
36  av_assert0(AV_PIX_FMT_VDA_VLD == 81); //check if the pix fmt enum has not had anything inserted or removed by mistake
41  av_assert0(HAVE_MMX2 == HAVE_MMXEXT);
42 
43  av_assert0(((size_t)-1) > 0); // C guarantees this but if false on a platform we care about revert at least b284e1ffe343d6697fb950d1ee517bafda8a9844
44 
45  if (av_sat_dadd32(1, 2) != 5) {
46  av_log(NULL, AV_LOG_FATAL, "Libavutil has been build with a broken binutils, please upgrade binutils and rebuild\n");
47  abort();
48  }
49 
50  if (llrint(1LL<<60) != 1LL<<60) {
51  av_log(NULL, AV_LOG_ERROR, "Libavutil has been linked to a broken llrint()\n");
52  }
53 
54 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 0
56 #endif
57  checks_done = 1;
58  return LIBAVUTIL_VERSION_INT;
59 }
60 
61 const char *avutil_configuration(void)
62 {
63  return FFMPEG_CONFIGURATION;
64 }
65 
66 const char *avutil_license(void)
67 {
68 #define LICENSE_PREFIX "libavutil license: "
69  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
70 }
71 
72 const char *av_get_media_type_string(enum AVMediaType media_type)
73 {
74  switch (media_type) {
75  case AVMEDIA_TYPE_VIDEO: return "video";
76  case AVMEDIA_TYPE_AUDIO: return "audio";
77  case AVMEDIA_TYPE_DATA: return "data";
78  case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
79  case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
80  default: return NULL;
81  }
82 }
83 
85 {
86  switch (pict_type) {
87  case AV_PICTURE_TYPE_I: return 'I';
88  case AV_PICTURE_TYPE_P: return 'P';
89  case AV_PICTURE_TYPE_B: return 'B';
90  case AV_PICTURE_TYPE_S: return 'S';
91  case AV_PICTURE_TYPE_SI: return 'i';
92  case AV_PICTURE_TYPE_SP: return 'p';
93  case AV_PICTURE_TYPE_BI: return 'b';
94  default: return '?';
95  }
96 }
97 
98 unsigned av_int_list_length_for_size(unsigned elsize,
99  const void *list, uint64_t term)
100 {
101  unsigned i;
102 
103  if (!list)
104  return 0;
105 #define LIST_LENGTH(type) \
106  { type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
107  switch (elsize) {
108  case 1: LIST_LENGTH(uint8_t); break;
109  case 2: LIST_LENGTH(uint16_t); break;
110  case 4: LIST_LENGTH(uint32_t); break;
111  case 8: LIST_LENGTH(uint64_t); break;
112  default: av_assert0(!"valid element size");
113  }
114  return i;
115 }
116 
118 {
119  return (AVRational){1, AV_TIME_BASE};
120 }