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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  if (av_sat_dadd32(1, 2) != 5) {
44  av_log(NULL, AV_LOG_FATAL, "Libavutil has been build with a broken binutils, please upgrade binutils and rebuild\n");
45  abort();
46  }
47 
48  if (llrint(1LL<<60) != 1LL<<60) {
49  av_log(NULL, AV_LOG_ERROR, "Libavutil has been linked to a broken llrint()\n");
50  }
51 
53  checks_done = 1;
54  return LIBAVUTIL_VERSION_INT;
55 }
56 
57 const char *avutil_configuration(void)
58 {
59  return FFMPEG_CONFIGURATION;
60 }
61 
62 const char *avutil_license(void)
63 {
64 #define LICENSE_PREFIX "libavutil license: "
65  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
66 }
67 
68 const char *av_get_media_type_string(enum AVMediaType media_type)
69 {
70  switch (media_type) {
71  case AVMEDIA_TYPE_VIDEO: return "video";
72  case AVMEDIA_TYPE_AUDIO: return "audio";
73  case AVMEDIA_TYPE_DATA: return "data";
74  case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
75  case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
76  default: return NULL;
77  }
78 }
79 
81 {
82  switch (pict_type) {
83  case AV_PICTURE_TYPE_I: return 'I';
84  case AV_PICTURE_TYPE_P: return 'P';
85  case AV_PICTURE_TYPE_B: return 'B';
86  case AV_PICTURE_TYPE_S: return 'S';
87  case AV_PICTURE_TYPE_SI: return 'i';
88  case AV_PICTURE_TYPE_SP: return 'p';
89  case AV_PICTURE_TYPE_BI: return 'b';
90  default: return '?';
91  }
92 }
93 
94 unsigned av_int_list_length_for_size(unsigned elsize,
95  const void *list, uint64_t term)
96 {
97  unsigned i;
98 
99  if (!list)
100  return 0;
101 #define LIST_LENGTH(type) \
102  { type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
103  switch (elsize) {
104  case 1: LIST_LENGTH(uint8_t); break;
105  case 2: LIST_LENGTH(uint16_t); break;
106  case 4: LIST_LENGTH(uint32_t); break;
107  case 8: LIST_LENGTH(uint64_t); break;
108  default: av_assert0(!"valid element size");
109  }
110  return i;
111 }