2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
23 * common internal and external api header.
31 #ifdef HAVE_AV_CONFIG_H
32 /* only include the following when compiling package */
42 #endif /* HAVE_AV_CONFIG_H */
44 #ifndef av_always_inline
45 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
46 # define av_always_inline __attribute__((always_inline)) inline
47 # define av_noinline __attribute__((noinline))
49 # define av_always_inline inline
54 #ifdef HAVE_AV_CONFIG_H
55 # include "internal.h"
56 #endif /* HAVE_AV_CONFIG_H */
58 #ifndef attribute_deprecated
59 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
60 # define attribute_deprecated __attribute__((deprecated))
62 # define attribute_deprecated
68 # define av_unused __attribute__((unused))
76 //rounded divison & shift
77 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
79 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
80 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
81 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
83 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
84 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
86 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
88 /* misc math functions */
89 extern const uint8_t ff_log2_tab[256];
91 static inline int av_log2(unsigned int v)
109 static inline int av_log2_16bit(unsigned int v)
124 static inline int mid_pred(int a, int b, int c)
141 int t= (a-b)&((a-b)>>31);
144 b-= (b-c)&((b-c)>>31);
145 b+= (a-b)&((a-b)>>31);
165 * clip a signed integer value into the amin-amax range
166 * @param a value to clip
167 * @param amin minimum value of the clip range
168 * @param amax maximum value of the clip range
169 * @return clipped value
171 static inline int av_clip(int a, int amin, int amax)
173 if (a < amin) return amin;
174 else if (a > amax) return amax;
179 * clip a signed integer value into the 0-255 range
180 * @param a value to clip
181 * @return clipped value
183 static inline uint8_t av_clip_uint8(int a)
185 if (a&(~255)) return (-a)>>31;
190 int64_t ff_gcd(int64_t a, int64_t b);
193 * converts fourcc string to int
195 static inline int ff_get_fourcc(const char *s){
196 #ifdef HAVE_AV_CONFIG_H
197 assert( strlen(s)==4 );
200 return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
203 #define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
204 #define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
207 * \def GET_UTF8(val, GET_BYTE, ERROR)
208 * converts a UTF-8 character (up to 4 bytes long) to its 32-bit UCS-4 encoded form
209 * \param val is the output and should be of type uint32_t. It holds the converted
210 * UCS-4 character and should be a left value.
211 * \param GET_BYTE gets UTF-8 encoded bytes from any proper source. It can be
212 * a function or a statement whose return value or evaluated value is of type
213 * uint8_t. It will be executed up to 4 times for values in the valid UTF-8 range,
214 * and up to 7 times in the general case.
215 * \param ERROR action that should be taken when an invalid UTF-8 byte is returned
216 * from GET_BYTE. It should be a statement that jumps out of the macro,
217 * like exit(), goto, return, break, or continue.
219 #define GET_UTF8(val, GET_BYTE, ERROR)\
222 int ones= 7 - av_log2(val ^ 255);\
227 int tmp= GET_BYTE - 128;\
230 val= (val<<6) + tmp;\
235 * \def PUT_UTF8(val, tmp, PUT_BYTE)
236 * converts a 32-bit unicode character to its UTF-8 encoded form (up to 4 bytes long).
237 * \param val is an input only argument and should be of type uint32_t. It holds
238 * a ucs4 encoded unicode character that is to be converted to UTF-8. If
239 * val is given as a function it's executed only once.
240 * \param tmp is a temporary variable and should be of type uint8_t. It
241 * represents an intermediate value during conversion that is to be
242 * outputted by PUT_BYTE.
243 * \param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
244 * It could be a function or a statement, and uses tmp as the input byte.
245 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
246 * executed up to 4 times for values in the valid UTF-8 range and up to
247 * 7 times in the general case, depending on the length of the converted
250 #define PUT_UTF8(val, tmp, PUT_BYTE)\
258 bytes = (av_log2(in) + 4) / 5;\
259 shift = (bytes - 1) * 6;\
260 tmp = (256 - (256 >> bytes)) | (in >> shift);\
262 while (shift >= 6) {\
264 tmp = 0x80 | ((in >> shift) & 0x3f);\
270 #if defined(ARCH_X86) || defined(ARCH_POWERPC) || defined(ARCH_BFIN)
271 #if defined(ARCH_X86_64)
272 static inline uint64_t read_time(void)
275 asm volatile( "rdtsc\n\t"
278 return (d << 32) | (a & 0xffffffff);
280 #elif defined(ARCH_X86_32)
281 static inline long long read_time(void)
284 asm volatile( "rdtsc\n\t"
290 static inline uint64_t read_time(void)
297 unsigned long long c;
299 asm volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi));
302 #else //FIXME check ppc64
303 static inline uint64_t read_time(void)
305 uint32_t tbu, tbl, temp;
307 /* from section 2.2.1 of the 32-bit PowerPC PEM */
308 __asm__ __volatile__(
315 : "=r"(tbl), "=r"(tbu), "=r"(temp)
319 return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
323 #define START_TIMER \
325 uint64_t tstart= read_time();\
327 #define STOP_TIMER(id) \
330 static uint64_t tsum=0;\
331 static int tcount=0;\
332 static int tskip_count=0;\
333 if(tcount<2 || tend - tstart < FFMAX(8*tsum/tcount, 2000)){\
334 tsum+= tend - tstart;\
338 if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
339 av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
344 #define STOP_TIMER(id) {}
347 #endif /* COMMON_H */