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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* common internal and external api header.
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#ifdef HAVE_AV_CONFIG_H
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/* only include the following when compiling package */
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#endif /* HAVE_AV_CONFIG_H */
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#ifndef av_always_inline
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#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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# define av_always_inline __attribute__((always_inline)) inline
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# define av_noinline __attribute__((noinline))
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# define av_always_inline inline
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#ifdef HAVE_AV_CONFIG_H
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# include "internal.h"
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#endif /* HAVE_AV_CONFIG_H */
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#ifndef attribute_deprecated
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#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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# define attribute_deprecated __attribute__((deprecated))
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# define attribute_deprecated
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//rounded divison & shift
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#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
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#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
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#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
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#define FFSIGN(a) ((a) > 0 ? 1 : -1)
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#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
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/* misc math functions */
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extern const uint8_t ff_log2_tab[256];
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static inline int av_log2(unsigned int v)
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static inline int av_log2_16bit(unsigned int v)
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static inline int mid_pred(int a, int b, int c)
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int t= (a-b)&((a-b)>>31);
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b-= (b-c)&((b-c)>>31);
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b+= (a-b)&((a-b)>>31);
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* clip a signed integer value into the amin-amax range
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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static inline int av_clip(int a, int amin, int amax)
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if (a < amin) return amin;
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else if (a > amax) return amax;
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* clip a signed integer value into the 0-255 range
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* @param a value to clip
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* @return clipped value
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static inline uint8_t av_clip_uint8(int a)
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if (a&(~255)) return (-a)>>31;
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int64_t ff_gcd(int64_t a, int64_t b);
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* converts fourcc string to int
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static inline int ff_get_fourcc(const char *s){
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#ifdef HAVE_AV_CONFIG_H
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assert( strlen(s)==4 );
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return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
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#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
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#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
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* \def GET_UTF8(val, GET_BYTE, ERROR)
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* converts a utf-8 character (up to 4 bytes long) to its 32-bit ucs-4 encoded form
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* \param val is the output and should be of type uint32_t. It holds the converted
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* ucs-4 character and should be a left value.
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* \param GET_BYTE gets utf-8 encoded bytes from any proper source. It can be
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* a function or a statement whose return value or evaluated value is of type
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* uint8_t. It will be executed up to 4 times for values in the valid utf-8 range,
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* and up to 7 times in the general case.
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* \param ERROR action that should be taken when an invalid utf-8 byte is returned
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* from GET_BYTE. It should be a statement that jumps out of the macro,
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* like exit(), goto, return, break, or continue.
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#define GET_UTF8(val, GET_BYTE, ERROR)\
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int ones= 7 - av_log2(val ^ 255);\
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int tmp= GET_BYTE - 128;\
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val= (val<<6) + tmp;\
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* \def PUT_UTF8(val, tmp, PUT_BYTE)
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* converts a 32-bit unicode character to its utf-8 encoded form (up to 4 bytes long).
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* \param val is an input only argument and should be of type uint32_t. It holds
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* a ucs4 encoded unicode character that is to be converted to utf-8. If
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* val is given as a function it's executed only once.
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* \param tmp is a temporary variable and should be of type uint8_t. It
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* represents an intermediate value during conversion that is to be
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* outputted by PUT_BYTE.
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* \param PUT_BYTE writes the converted utf-8 bytes to any proper destination.
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* It could be a function or a statement, and uses tmp as the input byte.
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* For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
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* executed up to 4 times for values in the valid utf-8 range and up to
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* 7 times in the general case, depending on the length of the converted
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#define PUT_UTF8(val, tmp, PUT_BYTE)\
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bytes = (av_log2(in) + 4) / 5;\
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shift = (bytes - 1) * 6;\
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tmp = (256 - (256 >> bytes)) | (in >> shift);\
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while (shift >= 6) {\
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tmp = 0x80 | ((in >> shift) & 0x3f);\
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#if defined(ARCH_X86) || defined(ARCH_POWERPC)
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#if defined(ARCH_X86_64)
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static inline uint64_t read_time(void)
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asm volatile( "rdtsc\n\t"
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return (d << 32) | (a & 0xffffffff);
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#elif defined(ARCH_X86_32)
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static inline long long read_time(void)
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asm volatile( "rdtsc\n\t"
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#else //FIXME check ppc64
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static inline uint64_t read_time(void)
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uint32_t tbu, tbl, temp;
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/* from section 2.2.1 of the 32-bit PowerPC PEM */
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__asm__ __volatile__(
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: "=r"(tbl), "=r"(tbu), "=r"(temp)
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return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
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#define START_TIMER \
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uint64_t tstart= read_time();\
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#define STOP_TIMER(id) \
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static uint64_t tsum=0;\
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static int tcount=0;\
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static int tskip_count=0;\
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if(tcount<2 || tend - tstart < FFMAX(8*tsum/tcount, 2000)){\
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tsum+= tend - tstart;\
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if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
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av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
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#define STOP_TIMER(id) {}
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#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
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#define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
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void *av_malloc(unsigned int size);
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void *av_realloc(void *ptr, unsigned int size);
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void av_free(void *ptr);
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void *av_mallocz(unsigned int size);
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char *av_strdup(const char *s);
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void av_freep(void *ptr);
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#endif /* COMMON_H */
added
removed
ffmpeg/common.h
