path: root/libavutil/utils.c (plain)
blob: 8cc7a9516cae97ebf1fd2914d5c6dc37b33a7ad6

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
44	#if FF_API_VDPAU
45	av_assert0(AV_PIX_FMT_VDA_VLD == 81); //check if the pix fmt enum has not had anything inserted or removed by mistake
46	#endif
47	av_assert0(AV_SAMPLE_FMT_DBLP == 9);
48	av_assert0(AVMEDIA_TYPE_ATTACHMENT == 4);
49	av_assert0(AV_PICTURE_TYPE_BI == 7);
50	av_assert0(LIBAVUTIL_VERSION_MICRO >= 100);
51	av_assert0(HAVE_MMX2 == HAVE_MMXEXT);
52
53	av_assert0(((size_t)-1) > 0); // C guarantees this but if false on a platform we care about revert at least b284e1ffe343d6697fb950d1ee517bafda8a9844
54
55	if (av_sat_dadd32(1, 2) != 5) {
56	av_log(NULL, AV_LOG_FATAL, "Libavutil has been built with a broken binutils, please upgrade binutils and rebuild\n");
57	abort();
58	}
59
60	if (llrint(1LL<<60) != 1LL<<60) {
61	av_log(NULL, AV_LOG_ERROR, "Libavutil has been linked to a broken llrint()\n");
62	}
63
64	checks_done = 1;
65	return LIBAVUTIL_VERSION_INT;
66	}
67
68	const char *avutil_configuration(void)
69	{
70	return FFMPEG_CONFIGURATION;
71	}
72
73	const char *avutil_license(void)
74	{
75	#define LICENSE_PREFIX "libavutil license: "
76	return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
77	}
78
79	const char *av_get_media_type_string(enum AVMediaType media_type)
80	{
81	switch (media_type) {
82	case AVMEDIA_TYPE_VIDEO: return "video";
83	case AVMEDIA_TYPE_AUDIO: return "audio";
84	case AVMEDIA_TYPE_DATA: return "data";
85	case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
86	case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
87	default: return NULL;
88	}
89	}
90
91	char av_get_picture_type_char(enum AVPictureType pict_type)
92	{
93	switch (pict_type) {
94	case AV_PICTURE_TYPE_I: return 'I';
95	case AV_PICTURE_TYPE_P: return 'P';
96	case AV_PICTURE_TYPE_B: return 'B';
97	case AV_PICTURE_TYPE_S: return 'S';
98	case AV_PICTURE_TYPE_SI: return 'i';
99	case AV_PICTURE_TYPE_SP: return 'p';
100	case AV_PICTURE_TYPE_BI: return 'b';
101	default: return '?';
102	}
103	}
104
105	unsigned av_int_list_length_for_size(unsigned elsize,
106	const void *list, uint64_t term)
107	{
108	unsigned i;
109
110	if (!list)
111	return 0;
112	#define LIST_LENGTH(type) \
113	{ type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
114	switch (elsize) {
115	case 1: LIST_LENGTH(uint8_t); break;
116	case 2: LIST_LENGTH(uint16_t); break;
117	case 4: LIST_LENGTH(uint32_t); break;
118	case 8: LIST_LENGTH(uint64_t); break;
119	default: av_assert0(!"valid element size");
120	}
121	return i;
122	}
123
124	char *av_fourcc_make_string(char *buf, uint32_t fourcc)
125	{
126	int i;
127	char *orig_buf = buf;
128	size_t buf_size = AV_FOURCC_MAX_STRING_SIZE;
129
130	for (i = 0; i < 4; i++) {
131	const int c = fourcc & 0xff;
132	const int print_chr = (c >= '0' && c <= '9') ||
133	(c >= 'a' && c <= 'z') ||
134	(c >= 'A' && c <= 'Z') ||
135	(c && strchr(". -_", c));
136	const int len = snprintf(buf, buf_size, print_chr ? "%c" : "[%d]", c);
137	if (len < 0)
138	break;
139	buf += len;
140	buf_size = buf_size > len ? buf_size - len : 0;
141	fourcc >>= 8;
142	}
143
144	return orig_buf;
145	}
146
147	AVRational av_get_time_base_q(void)
148	{
149	return (AVRational){1, AV_TIME_BASE};
150	}
151
152	void av_assert0_fpu(void) {
153	#if HAVE_MMX_INLINE
154	uint16_t state[14];
155	__asm volatile (
156	"fstenv %0 \n\t"
157	: "+m" (state)
158	:
159	: "memory"
160	);
161	av_assert0((state[4] & 3) == 3);
162	#endif
163	}
164