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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 const char *av_version_info(void)
34 {
35  return FFMPEG_VERSION;
36 }
37 
38 unsigned avutil_version(void)
39 {
40  static int checks_done;
41  if (checks_done)
42  return LIBAVUTIL_VERSION_INT;
43 
48  av_assert0(HAVE_MMX2 == HAVE_MMXEXT);
49 
50  av_assert0(((size_t)-1) > 0); // C guarantees this but if false on a platform we care about revert at least b284e1ffe343d6697fb950d1ee517bafda8a9844
51 
52  if (av_sat_dadd32(1, 2) != 5) {
53  av_log(NULL, AV_LOG_FATAL, "Libavutil has been built with a broken binutils, please upgrade binutils and rebuild\n");
54  abort();
55  }
56 
57  if (llrint(1LL<<60) != 1LL<<60) {
58  av_log(NULL, AV_LOG_ERROR, "Libavutil has been linked to a broken llrint()\n");
59  }
60 
61  checks_done = 1;
62  return LIBAVUTIL_VERSION_INT;
63 }
64 
65 const char *avutil_configuration(void)
66 {
67  return FFMPEG_CONFIGURATION;
68 }
69 
70 const char *avutil_license(void)
71 {
72 #define LICENSE_PREFIX "libavutil license: "
73  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
74 }
75 
76 const char *av_get_media_type_string(enum AVMediaType media_type)
77 {
78  switch (media_type) {
79  case AVMEDIA_TYPE_VIDEO: return "video";
80  case AVMEDIA_TYPE_AUDIO: return "audio";
81  case AVMEDIA_TYPE_DATA: return "data";
82  case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
83  case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
84  default: return NULL;
85  }
86 }
87 
89 {
90  switch (pict_type) {
91  case AV_PICTURE_TYPE_I: return 'I';
92  case AV_PICTURE_TYPE_P: return 'P';
93  case AV_PICTURE_TYPE_B: return 'B';
94  case AV_PICTURE_TYPE_S: return 'S';
95  case AV_PICTURE_TYPE_SI: return 'i';
96  case AV_PICTURE_TYPE_SP: return 'p';
97  case AV_PICTURE_TYPE_BI: return 'b';
98  default: return '?';
99  }
100 }
101 
102 unsigned av_int_list_length_for_size(unsigned elsize,
103  const void *list, uint64_t term)
104 {
105  unsigned i;
106 
107  if (!list)
108  return 0;
109 #define LIST_LENGTH(type) \
110  { type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
111  switch (elsize) {
112  case 1: LIST_LENGTH(uint8_t); break;
113  case 2: LIST_LENGTH(uint16_t); break;
114  case 4: LIST_LENGTH(uint32_t); break;
115  case 8: LIST_LENGTH(uint64_t); break;
116  default: av_assert0(!"valid element size");
117  }
118  return i;
119 }
120 
121 char *av_fourcc_make_string(char *buf, uint32_t fourcc)
122 {
123  int i;
124  char *orig_buf = buf;
125  size_t buf_size = AV_FOURCC_MAX_STRING_SIZE;
126 
127  for (i = 0; i < 4; i++) {
128  const int c = fourcc & 0xff;
129  const int print_chr = (c >= '0' && c <= '9') ||
130  (c >= 'a' && c <= 'z') ||
131  (c >= 'A' && c <= 'Z') ||
132  (c && strchr(". -_", c));
133  const int len = snprintf(buf, buf_size, print_chr ? "%c" : "[%d]", c);
134  if (len < 0)
135  break;
136  buf += len;
137  buf_size = buf_size > len ? buf_size - len : 0;
138  fourcc >>= 8;
139  }
140 
141  return orig_buf;
142 }
143 
145 {
146  return (AVRational){1, AV_TIME_BASE};
147 }
148 
149 void av_assert0_fpu(void) {
150 #if HAVE_MMX_INLINE
151  uint16_t state[14];
152  __asm__ volatile (
153  "fstenv %0 \n\t"
154  : "+m" (state)
155  :
156  : "memory"
157  );
158  av_assert0((state[4] & 3) == 3);
159 #endif
160 }
#define NULL
Definition: coverity.c:32
BI type.
Definition: avutil.h:280
uint32_t fourcc
Definition: hwcontext_qsv.c:90
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
const char * avutil_configuration(void)
Return the libavutil build-time configuration.
Definition: utils.c:65
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char av_util_ffversion[]
Definition: utils.c:31
double, planar
Definition: samplefmt.h:70
Convenience header that includes libavutil's core.
#define LICENSE_PREFIX
Switching Intra.
Definition: avutil.h:278
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:203
void av_assert0_fpu(void)
Assert that floating point opperations can be executed.
Definition: utils.c:149
static struct @281 state
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:88
#define av_log(a,...)
unsigned avutil_version(void)
Return the LIBAVUTIL_VERSION_INT constant.
Definition: utils.c:38
#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:102
#define LIBAVUTIL_VERSION_MICRO
Definition: version.h:83
#define AV_FOURCC_MAX_STRING_SIZE
Definition: avutil.h:346
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:254
const char * av_version_info(void)
Return an informative version string.
Definition: utils.c:33
Opaque data information usually sparse.
Definition: avutil.h:205
char * av_fourcc_make_string(char *buf, uint32_t fourcc)
Fill the provided buffer with a string containing a FourCC (four-character code) representation.
Definition: utils.c:121
const char * avutil_license(void)
Return the libavutil license.
Definition: utils.c:70
#define LIST_LENGTH(type)
void * buf
Definition: avisynth_c.h:690
#define llrint(x)
Definition: libm.h:394
Switching Predicted.
Definition: avutil.h:279
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVMediaType
Definition: avutil.h:199
AVPictureType
Definition: avutil.h:272
#define snprintf
Definition: snprintf.h:34
AVRational av_get_time_base_q(void)
Return the fractional representation of the internal time base.
Definition: utils.c:144
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:76
static double c[64]
Bi-dir predicted.
Definition: avutil.h:276
int len
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: log.h:170
Predicted.
Definition: avutil.h:275