FFmpeg  2.1.1
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
42 
43  av_assert0(((size_t)-1) > 0); // C gurantees 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 
55  checks_done = 1;
56  return LIBAVUTIL_VERSION_INT;
57 }
58 
59 const char *avutil_configuration(void)
60 {
61  return FFMPEG_CONFIGURATION;
62 }
63 
64 const char *avutil_license(void)
65 {
66 #define LICENSE_PREFIX "libavutil license: "
67  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
68 }
69 
70 const char *av_get_media_type_string(enum AVMediaType media_type)
71 {
72  switch (media_type) {
73  case AVMEDIA_TYPE_VIDEO: return "video";
74  case AVMEDIA_TYPE_AUDIO: return "audio";
75  case AVMEDIA_TYPE_DATA: return "data";
76  case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
77  case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
78  default: return NULL;
79  }
80 }
81 
83 {
84  switch (pict_type) {
85  case AV_PICTURE_TYPE_I: return 'I';
86  case AV_PICTURE_TYPE_P: return 'P';
87  case AV_PICTURE_TYPE_B: return 'B';
88  case AV_PICTURE_TYPE_S: return 'S';
89  case AV_PICTURE_TYPE_SI: return 'i';
90  case AV_PICTURE_TYPE_SP: return 'p';
91  case AV_PICTURE_TYPE_BI: return 'b';
92  default: return '?';
93  }
94 }
95 
96 unsigned av_int_list_length_for_size(unsigned elsize,
97  const void *list, uint64_t term)
98 {
99  unsigned i;
100 
101  if (!list)
102  return 0;
103 #define LIST_LENGTH(type) \
104  { type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
105  switch (elsize) {
106  case 1: LIST_LENGTH(uint8_t); break;
107  case 2: LIST_LENGTH(uint16_t); break;
108  case 4: LIST_LENGTH(uint32_t); break;
109  case 8: LIST_LENGTH(uint64_t); break;
110  default: av_assert0(!"valid element size");
111  }
112  return i;
113 }
#define LIBAVUTIL_VERSION_INT
Definition: avcodec.h:820
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
#define LICENSE_PREFIX
#define FFMPEG_LICENSE
Definition: config.h:5
Predicted.
Definition: avcodec.h:2305
simple assert() macros that are a bit more flexible than ISO C assert().
uint8_t
S(GMC)-VOP MPEG4.
Definition: avcodec.h:2307
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:82
void ff_check_pixfmt_descriptors(void)
Definition: pixdesc.c:1994
unsigned avutil_version(void)
Return the LIBAVUTIL_VERSION_INT constant.
Definition: utils.c:30
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
unsigned av_int_list_length_for_size(unsigned elsize, const void *list, uint64_t term) av_pure
Compute the length of an integer list.
Definition: utils.c:96
#define LIBAVUTIL_VERSION_MICRO
Definition: avcodec.h:818
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:70
Opaque data information usually continuous.
Definition: avcodec.h:2233
const char * avutil_license(void)
Return the libavutil license.
Definition: utils.c:64
Switching Predicted.
Definition: avcodec.h:2309
#define LIST_LENGTH(type)
external API header
#define llrint(x)
Definition: libm.h:112
Bi-dir predicted.
Definition: avcodec.h:2306
AVMediaType
Definition: avutil.h:180
AVPictureType
Definition: avutil.h:253
Switching Intra.
Definition: avcodec.h:2308
hardware decoding through VDA
Definition: avcodec.h:4632
#define HAVE_MMXEXT
Definition: config.h:51
#define FFMPEG_CONFIGURATION
Definition: config.h:4
Opaque data information usually sparse.
Definition: avcodec.h:2235
#define HAVE_MMX2
Definition: config.h:13
const char * avutil_configuration(void)
Return the libavutil build-time configuration.
Definition: utils.c:59
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: avcodec.h:4141
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
double, planar
Definition: samplefmt.h:61