1 /*****************************************************************************
2 * utils.h
3 *****************************************************************************
4 * Copyright (C) 2010-2017 L-SMASH project
5 *
6 * Authors: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
7 *
8 * Permission to use, copy, modify, and/or distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 *****************************************************************************/
20
21 /* This file is available under an ISC license. */
22
23 #ifndef LSMASH_UTIL_H
24 #define LSMASH_UTIL_H
25
26 #define debug_if(x) if(x)
27
28 #define LSMASH_MAX( a, b ) ((a) > (b) ? (a) : (b))
29 #define LSMASH_MIN( a, b ) ((a) < (b) ? (a) : (b))
30
31 #define EXPAND_VA_ARGS( ... ) __VA_ARGS__
32
33 /* default arguments
34 * Use only CALL_FUNC_DEFAULT_ARGS().
35 * The defined macros can't be passed a macro argument requiring the empty parameter list.
36 *
37 * The following is an example.
38 * #define TEMPLATE_A( ... ) CALL_FUNC_DEFAULT_ARGS( TEMPLATE_A, __VA_ARGS__ )
39 * #define TEMPLATE_A_1( _1 ) _1( 1 )
40 * #define TEMPLATE_B( ... ) CALL_FUNC_DEFAULT_ARGS( TEMPLATE_B, __VA_ARGS__ )
41 * #define TEMPLATE_B_2( _1, _2 ) ((_1) + (_2))
42 * #define TEMPLATE_B_1( _1 ) TEMPLATE_B_2( _1, 0 )
43 * #define TEMPLATE_B_0()
44 * int main( void )
45 * {
46 * TEMPLATE_A( TEMPLATE_B_1 ); // OK
47 * TEMPLATE_A( TEMPLATE_B ); // NG
48 * TEMPLATE_B( 1, 2 ); // OK
49 * TEMPLATE_B(); // NG
50 * return 0;
51 * }
52 * */
53 #define NUM_ARGS( _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, ... ) _12
54 #ifdef _MSC_VER
55 #define COUNT_NUM_ARGS( ... ) EXPAND_VA_ARGS( NUM_ARGS( __VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0 ) )
56 #else
57 #define COUNT_NUM_ARGS( ... ) NUM_ARGS( __VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0 )
58 #endif
59 #define GET_FUNC_BY_NUM_ARGS_EXN( func_name, N ) func_name ## _ ## N
60 #define GET_FUNC_BY_NUM_ARGS_EX0( func_name, N ) GET_FUNC_BY_NUM_ARGS_EXN( func_name, N )
61 #define GET_FUNC_BY_NUM_ARGS_EX1( func_name, ... ) GET_FUNC_BY_NUM_ARGS_EX0( func_name, COUNT_NUM_ARGS( __VA_ARGS__ ) )
62 #define CALL_FUNC_DEFAULT_ARGS( func_name, ... ) GET_FUNC_BY_NUM_ARGS_EX1( func_name, __VA_ARGS__ ) ( __VA_ARGS__ )
63
64 /*---- class ----*/
65 typedef struct
66 {
67 char *name;
68 size_t log_level_offset; /* offset in the struct where 'log_level' is placed
69 * If set to 0, 'log_level' is unavailable and implicitly set to LSMASH_LOG_INFO. */
70 } lsmash_class_t;
71
72 /*---- type ----*/
73 double lsmash_fixed2double( uint64_t value, int frac_width );
74 float lsmash_int2float32( uint32_t value );
75 double lsmash_int2float64( uint64_t value );
76
77 /*---- others ----*/
78 typedef enum
79 {
80 LSMASH_LOG_QUIET = 0,
81 LSMASH_LOG_ERROR,
82 LSMASH_LOG_WARNING,
83 LSMASH_LOG_INFO,
84 } lsmash_log_level;
85
86 typedef struct
87 {
88 uint64_t n;
89 uint64_t d;
90 } lsmash_rational_u64_t;
91
92 typedef struct
93 {
94 int64_t n;
95 uint64_t d;
96 } lsmash_rational_s64_t;
97
98 void lsmash_log
99 (
100 const void *class,
101 lsmash_log_level level,
102 const char *message,
103 ...
104 );
105
106 void lsmash_log_refresh_line
107 (
108 const void *class
109 );
110
111 uint32_t lsmash_count_bits
112 (
113 uint32_t bits
114 );
115
116 void lsmash_ifprintf
117 (
118 FILE *fp,
119 int indent,
120 const char *format, ...
121 );
122
123 int lsmash_ceil_log2
124 (
125 uint64_t value
126 );
127
128 int lsmash_compare_dts
129 (
130 const lsmash_media_ts_t *a,
131 const lsmash_media_ts_t *b
132 );
133
134 int lsmash_compare_cts
135 (
136 const lsmash_media_ts_t *a,
137 const lsmash_media_ts_t *b
138 );
139
lsmash_get_gcd(uint64_t a,uint64_t b)140 static inline uint64_t lsmash_get_gcd
141 (
142 uint64_t a,
143 uint64_t b
144 )
145 {
146 if( !b )
147 return a;
148 while( 1 )
149 {
150 uint64_t c = a % b;
151 if( !c )
152 return b;
153 a = b;
154 b = c;
155 }
156 }
157
lsmash_get_lcm(uint64_t a,uint64_t b)158 static inline uint64_t lsmash_get_lcm
159 (
160 uint64_t a,
161 uint64_t b
162 )
163 {
164 if( !a )
165 return 0;
166 return (a / lsmash_get_gcd( a, b )) * b;
167 }
168
lsmash_reduce_fraction(uint64_t * a,uint64_t * b)169 static inline void lsmash_reduce_fraction
170 (
171 uint64_t *a,
172 uint64_t *b
173 )
174 {
175 if( !a || !b )
176 return;
177 uint64_t gcd = lsmash_get_gcd( *a, *b );
178 if( gcd )
179 {
180 *a /= gcd;
181 *b /= gcd;
182 }
183 }
184
lsmash_reduce_fraction_su(int64_t * a,uint64_t * b)185 static inline void lsmash_reduce_fraction_su
186 (
187 int64_t *a,
188 uint64_t *b
189 )
190 {
191 if( !a || !b )
192 return;
193 uint64_t c = *a > 0 ? *a : -(*a);
194 uint64_t gcd = lsmash_get_gcd( c, *b );
195 if( gcd )
196 {
197 c /= gcd;
198 *b /= gcd;
199 *a = *a > 0 ? (signed)c : -(signed)c;
200 }
201 }
202
203 #endif
204