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
23 /**
24 * @file
25 * various utility functions
26 */
27
av_get_media_type_string(enum AVMediaType media_type)28 const char *av_get_media_type_string(enum AVMediaType media_type)
29 {
30 switch (media_type) {
31 case AVMEDIA_TYPE_VIDEO: return "video";
32 case AVMEDIA_TYPE_AUDIO: return "audio";
33 case AVMEDIA_TYPE_DATA: return "data";
34 case AVMEDIA_TYPE_SUBTITLE: return "subtitle";
35 case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
36 default: return NULL;
37 }
38 }
39
av_get_picture_type_char(enum AVPictureType pict_type)40 char av_get_picture_type_char(enum AVPictureType pict_type)
41 {
42 switch (pict_type) {
43 case AV_PICTURE_TYPE_I: return 'I';
44 case AV_PICTURE_TYPE_P: return 'P';
45 case AV_PICTURE_TYPE_B: return 'B';
46 case AV_PICTURE_TYPE_S: return 'S';
47 case AV_PICTURE_TYPE_SI: return 'i';
48 case AV_PICTURE_TYPE_SP: return 'p';
49 case AV_PICTURE_TYPE_BI: return 'b';
50 default: return '?';
51 }
52 }
53
av_int_list_length_for_size(unsigned elsize, const void *list, uint64_t term)54 unsigned av_int_list_length_for_size(unsigned elsize,
55 const void *list, uint64_t term)
56 {
57 unsigned i;
58
59 if (!list)
60 return 0;
61 #define LIST_LENGTH(type) \
62 { type t = term, *l = (type *)list; for (i = 0; l[i] != t; i++); }
63 switch (elsize) {
64 case 1: LIST_LENGTH(uint8_t); break;
65 case 2: LIST_LENGTH(uint16_t); break;
66 case 4: LIST_LENGTH(uint32_t); break;
67 case 8: LIST_LENGTH(uint64_t); break;
68 default: av_assert0(!"valid element size");
69 }
70 return i;
71 }
72
av_fourcc_make_string(char *buf, uint32_t fourcc)73 char *av_fourcc_make_string(char *buf, uint32_t fourcc)
74 {
75 int i;
76 char *orig_buf = buf;
77 size_t buf_size = AV_FOURCC_MAX_STRING_SIZE;
78
79 for (i = 0; i < 4; i++) {
80 const int c = fourcc & 0xff;
81 const int print_chr = (c >= '0' && c <= '9') ||
82 (c >= 'a' && c <= 'z') ||
83 (c >= 'A' && c <= 'Z') ||
84 (c && strchr(". -_", c));
85 const int len = snprintf(buf, buf_size, print_chr ? "%c" : "[%d]", c);
86 if (len < 0)
87 break;
88 buf += len;
89 buf_size = buf_size > len ? buf_size - len : 0;
90 fourcc >>= 8;
91 }
92
93 return orig_buf;
94 }
95
av_get_time_base_q(void)96 AVRational av_get_time_base_q(void)
97 {
98 return (AVRational){1, AV_TIME_BASE};
99 }
100
av_assert0_fpu(void)101 void av_assert0_fpu(void) {
102 #if HAVE_MMX_INLINE
103 uint16_t state[14];
104 __asm__ volatile (
105 "fstenv %0 \n\t"
106 : "+m" (state)
107 :
108 : "memory"
109 );
110 av_assert0((state[4] & 3) == 3);
111 #endif
112 }
113