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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 "internal.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  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 }
#define NULL
Definition: coverity.c:32
BI type.
Definition: avutil.h:273
S(GMC)-VOP MPEG4.
Definition: avutil.h:270
const char * avutil_configuration(void)
Return the libavutil build-time configuration.
Definition: utils.c:61
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
const char av_util_ffversion[]
Definition: utils.c:31
double, planar
Definition: samplefmt.h:71
external API header
#define LICENSE_PREFIX
Switching Intra.
Definition: avutil.h:271
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:196
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:84
#define av_log(a,...)
unsigned avutil_version(void)
Return the LIBAVUTIL_VERSION_INT constant.
Definition: utils.c:33
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned av_int_list_length_for_size(unsigned elsize, const void *list, uint64_t term)
Compute the length of an integer list.
Definition: utils.c:98
#define LIBAVUTIL_VERSION_MICRO
Definition: version.h:60
simple assert() macros that are a bit more flexible than ISO C assert().
common internal API header
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:247
Opaque data information usually sparse.
Definition: avutil.h:198
const char * avutil_license(void)
Return the libavutil license.
Definition: utils.c:66
#define LIST_LENGTH(type)
#define llrint(x)
Definition: libm.h:112
Switching Predicted.
Definition: avutil.h:272
rational number numerator/denominator
Definition: rational.h:43
AVMediaType
Definition: avutil.h:192
AVPictureType
Definition: avutil.h:265
AVRational av_get_time_base_q(void)
Return the fractional representation of the internal time base.
Definition: utils.c:117
const char * av_get_media_type_string(enum AVMediaType media_type)
Return a string describing the media_type enum, NULL if media_type is unknown.
Definition: utils.c:72
hardware decoding through VDA
Definition: pixfmt.h:168
Bi-dir predicted.
Definition: avutil.h:269
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: log.h:170
Predicted.
Definition: avutil.h:268