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view libavutil/common.h @ 9:ea1ba68cf0ed
update to match api changes + add sscc produced source
| author | Nina Engelhardt <nengel@mailbox.tu-berlin.de> |
|---|---|
| date | Wed, 05 Jun 2013 14:43:26 +0200 |
| parents | |
| children |
line source
1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
21 /**
22 * @file
23 * common internal and external API header
24 */
26 #ifndef AVUTIL_COMMON_H
27 #define AVUTIL_COMMON_H
29 #include <ctype.h>
30 #include <errno.h>
31 #include <inttypes.h>
32 #include <limits.h>
33 #include <math.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include "attributes.h"
39 //rounded division & shift
40 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
41 /* assume b>0 */
42 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
43 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
44 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
46 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
47 #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
48 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
49 #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
51 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
52 #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
53 #define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
55 /* misc math functions */
56 extern const uint8_t ff_log2_tab[256];
58 static inline av_const int av_log2_c(unsigned int v)
59 {
60 int n = 0;
61 if (v & 0xffff0000) {
62 v >>= 16;
63 n += 16;
64 }
65 if (v & 0xff00) {
66 v >>= 8;
67 n += 8;
68 }
69 n += ff_log2_tab[v];
71 return n;
72 }
74 static inline av_const int av_log2_16bit_c(unsigned int v)
75 {
76 int n = 0;
77 if (v & 0xff00) {
78 v >>= 8;
79 n += 8;
80 }
81 n += ff_log2_tab[v];
83 return n;
84 }
86 #ifdef HAVE_AV_CONFIG_H
87 # include "config.h"
88 #endif
90 /**
91 * Clips a signed integer value into the amin-amax range.
92 * @param a value to clip
93 * @param amin minimum value of the clip range
94 * @param amax maximum value of the clip range
95 * @return clipped value
96 */
97 static inline av_const int av_clip(int a, int amin, int amax)
98 {
99 if (a < amin) return amin;
100 else if (a > amax) return amax;
101 else return a;
102 }
104 /**
105 * Clips a signed integer value into the 0-255 range.
106 * @param a value to clip
107 * @return clipped value
108 */
109 static inline av_const uint8_t av_clip_uint8(int a)
110 {
111 if (a&(~0xFF)) return (-a)>>31;
112 else return a;
113 }
115 /**
116 * Clips a signed integer value into the 0-65535 range.
117 * @param a value to clip
118 * @return clipped value
119 */
120 static inline av_const uint16_t av_clip_uint16(int a)
121 {
122 if (a&(~0xFFFF)) return (-a)>>31;
123 else return a;
124 }
126 /**
127 * Clips a signed integer value into the -32768,32767 range.
128 * @param a value to clip
129 * @return clipped value
130 */
131 static inline av_const int16_t av_clip_int16(int a)
132 {
133 if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
134 else return a;
135 }
137 /**
138 * Clips a signed 64-bit integer value into the -2147483648,2147483647 range.
139 * @param a value to clip
140 * @return clipped value
141 */
142 static inline av_const int32_t av_clipl_int32(int64_t a)
143 {
144 if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF;
145 else return a;
146 }
148 /**
149 * Clips a float value into the amin-amax range.
150 * @param a value to clip
151 * @param amin minimum value of the clip range
152 * @param amax maximum value of the clip range
153 * @return clipped value
154 */
155 static inline av_const float av_clipf(float a, float amin, float amax)
156 {
157 if (a < amin) return amin;
158 else if (a > amax) return amax;
159 else return a;
160 }
162 /** Computes ceil(log2(x)).
163 * @param x value used to compute ceil(log2(x))
164 * @return computed ceiling of log2(x)
165 */
166 static inline av_const int av_ceil_log2(int x)
167 {
168 return av_log2_c((x - 1) << 1);
169 }
171 #define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
172 #define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
174 /*!
175 * \def GET_UTF8(val, GET_BYTE, ERROR)
176 * Converts a UTF-8 character (up to 4 bytes long) to its 32-bit UCS-4 encoded form
177 * \param val is the output and should be of type uint32_t. It holds the converted
178 * UCS-4 character and should be a left value.
179 * \param GET_BYTE gets UTF-8 encoded bytes from any proper source. It can be
180 * a function or a statement whose return value or evaluated value is of type
181 * uint8_t. It will be executed up to 4 times for values in the valid UTF-8 range,
182 * and up to 7 times in the general case.
183 * \param ERROR action that should be taken when an invalid UTF-8 byte is returned
184 * from GET_BYTE. It should be a statement that jumps out of the macro,
185 * like exit(), goto, return, break, or continue.
186 */
187 #define GET_UTF8(val, GET_BYTE, ERROR)\
188 val= GET_BYTE;\
189 {\
190 int ones= 7 - av_log2(val ^ 255);\
191 if(ones==1)\
192 ERROR\
193 val&= 127>>ones;\
194 while(--ones > 0){\
195 int tmp= GET_BYTE - 128;\
196 if(tmp>>6)\
197 ERROR\
198 val= (val<<6) + tmp;\
199 }\
200 }
202 /*!
203 * \def GET_UTF16(val, GET_16BIT, ERROR)
204 * Converts a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form
205 * \param val is the output and should be of type uint32_t. It holds the converted
206 * UCS-4 character and should be a left value.
207 * \param GET_16BIT gets two bytes of UTF-16 encoded data converted to native endianness.
208 * It can be a function or a statement whose return value or evaluated value is of type
209 * uint16_t. It will be executed up to 2 times.
210 * \param ERROR action that should be taken when an invalid UTF-16 surrogate is
211 * returned from GET_BYTE. It should be a statement that jumps out of the macro,
212 * like exit(), goto, return, break, or continue.
213 */
214 #define GET_UTF16(val, GET_16BIT, ERROR)\
215 val = GET_16BIT;\
216 {\
217 unsigned int hi = val - 0xD800;\
218 if (hi < 0x800) {\
219 val = GET_16BIT - 0xDC00;\
220 if (val > 0x3FFU || hi > 0x3FFU)\
221 ERROR\
222 val += (hi<<10) + 0x10000;\
223 }\
224 }\
226 /*!
227 * \def PUT_UTF8(val, tmp, PUT_BYTE)
228 * Converts a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
229 * \param val is an input-only argument and should be of type uint32_t. It holds
230 * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
231 * val is given as a function it is executed only once.
232 * \param tmp is a temporary variable and should be of type uint8_t. It
233 * represents an intermediate value during conversion that is to be
234 * output by PUT_BYTE.
235 * \param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
236 * It could be a function or a statement, and uses tmp as the input byte.
237 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
238 * executed up to 4 times for values in the valid UTF-8 range and up to
239 * 7 times in the general case, depending on the length of the converted
240 * Unicode character.
241 */
242 #define PUT_UTF8(val, tmp, PUT_BYTE)\
243 {\
244 int bytes, shift;\
245 uint32_t in = val;\
246 if (in < 0x80) {\
247 tmp = in;\
248 PUT_BYTE\
249 } else {\
250 bytes = (av_log2(in) + 4) / 5;\
251 shift = (bytes - 1) * 6;\
252 tmp = (256 - (256 >> bytes)) | (in >> shift);\
253 PUT_BYTE\
254 while (shift >= 6) {\
255 shift -= 6;\
256 tmp = 0x80 | ((in >> shift) & 0x3f);\
257 PUT_BYTE\
258 }\
259 }\
260 }
262 /*!
263 * \def PUT_UTF16(val, tmp, PUT_16BIT)
264 * Converts a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
265 * \param val is an input-only argument and should be of type uint32_t. It holds
266 * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
267 * val is given as a function it is executed only once.
268 * \param tmp is a temporary variable and should be of type uint16_t. It
269 * represents an intermediate value during conversion that is to be
270 * output by PUT_16BIT.
271 * \param PUT_16BIT writes the converted UTF-16 data to any proper destination
272 * in desired endianness. It could be a function or a statement, and uses tmp
273 * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
274 * PUT_BYTE will be executed 1 or 2 times depending on input character.
275 */
276 #define PUT_UTF16(val, tmp, PUT_16BIT)\
277 {\
278 uint32_t in = val;\
279 if (in < 0x10000) {\
280 tmp = in;\
281 PUT_16BIT\
282 } else {\
283 tmp = 0xD800 | ((in - 0x10000) >> 10);\
284 PUT_16BIT\
285 tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
286 PUT_16BIT\
287 }\
288 }\
292 #include "mem.h"
294 #ifdef HAVE_AV_CONFIG_H
295 # include "internal.h"
296 #endif /* HAVE_AV_CONFIG_H */
298 #endif /* AVUTIL_COMMON_H */