/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file common.h * common internal and external api header. */ #ifndef FFMPEG_COMMON_H #define FFMPEG_COMMON_H #include <inttypes.h> #ifdef HAVE_AV_CONFIG_H /* only include the following when compiling package */ # include "config.h" # include <stdlib.h> # include <stdio.h> # include <string.h> # include <ctype.h> # include <limits.h> # include <errno.h> # include <math.h> #endif /* HAVE_AV_CONFIG_H */ #ifndef av_always_inline #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0) # define av_always_inline __attribute__((always_inline)) inline #else # define av_always_inline inline #endif #endif #ifndef av_noinline #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0) # define av_noinline __attribute__((noinline)) #else # define av_noinline #endif #endif #ifdef HAVE_AV_CONFIG_H # include "internal.h" #endif /* HAVE_AV_CONFIG_H */ #ifndef attribute_deprecated #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0) # define attribute_deprecated __attribute__((deprecated)) #else # define attribute_deprecated #endif #endif #ifndef av_unused #if defined(__GNUC__) # define av_unused __attribute__((unused)) #else # define av_unused #endif #endif #include "mem.h" //rounded divison & shift #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) /* assume b>0 */ #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) #define FFABS(a) ((a) >= 0 ? (a) : (-(a))) #define FFSIGN(a) ((a) > 0 ? 1 : -1) #define FFMAX(a,b) ((a) > (b) ? (a) : (b)) #define FFMIN(a,b) ((a) > (b) ? (b) : (a)) #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) /* misc math functions */ extern const uint8_t ff_log2_tab[256]; static inline int av_log2(unsigned int v) { int n; n = 0; if (v & 0xffff0000) { v >>= 16; n += 16; } if (v & 0xff00) { v >>= 8; n += 8; } n += ff_log2_tab[v]; return n; } static inline int av_log2_16bit(unsigned int v) { int n; n = 0; if (v & 0xff00) { v >>= 8; n += 8; } n += ff_log2_tab[v]; return n; } /* median of 3 */ static inline int mid_pred(int a, int b, int c) { #ifdef HAVE_CMOV int i=b; asm volatile( "cmp %2, %1 \n\t" "cmovg %1, %0 \n\t" "cmovg %2, %1 \n\t" "cmp %3, %1 \n\t" "cmovl %3, %1 \n\t" "cmp %1, %0 \n\t" "cmovg %1, %0 \n\t" :"+&r"(i), "+&r"(a) :"r"(b), "r"(c) ); return i; #elif 0 int t= (a-b)&((a-b)>>31); a-=t; b+=t; b-= (b-c)&((b-c)>>31); b+= (a-b)&((a-b)>>31); return b; #else if(a>b){ if(c>b){ if(c>a) b=a; else b=c; } }else{ if(b>c){ if(c>a) b=c; else b=a; } } return b; #endif } /** * clip a signed integer value into the amin-amax range * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value of the clip range * @return clipped value */ static inline int av_clip(int a, int amin, int amax) { if (a < amin) return amin; else if (a > amax) return amax; else return a; } /** * clip a signed integer value into the 0-255 range * @param a value to clip * @return clipped value */ static inline uint8_t av_clip_uint8(int a) { if (a&(~255)) return (-a)>>31; else return a; } /** * clip a signed integer value into the -32768,32767 range * @param a value to clip * @return clipped value */ static inline int16_t av_clip_int16(int a) { if ((a+32768) & ~65535) return (a>>31) ^ 32767; else return a; } /* math */ int64_t ff_gcd(int64_t a, int64_t b); /** * converts fourcc string to int */ static inline int ff_get_fourcc(const char *s){ #ifdef HAVE_AV_CONFIG_H assert( strlen(s)==4 ); #endif return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24); } #define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24)) #define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24)) /*! * \def GET_UTF8(val, GET_BYTE, ERROR) * converts a UTF-8 character (up to 4 bytes long) to its 32-bit UCS-4 encoded form * \param val is the output and should be of type uint32_t. It holds the converted * UCS-4 character and should be a left value. * \param GET_BYTE gets UTF-8 encoded bytes from any proper source. It can be * a function or a statement whose return value or evaluated value is of type * uint8_t. It will be executed up to 4 times for values in the valid UTF-8 range, * and up to 7 times in the general case. * \param ERROR action that should be taken when an invalid UTF-8 byte is returned * from GET_BYTE. It should be a statement that jumps out of the macro, * like exit(), goto, return, break, or continue. */ #define GET_UTF8(val, GET_BYTE, ERROR)\ val= GET_BYTE;\ {\ int ones= 7 - av_log2(val ^ 255);\ if(ones==1)\ ERROR\ val&= 127>>ones;\ while(--ones > 0){\ int tmp= GET_BYTE - 128;\ if(tmp>>6)\ ERROR\ val= (val<<6) + tmp;\ }\ } /*! * \def PUT_UTF8(val, tmp, PUT_BYTE) * converts a 32-bit unicode character to its UTF-8 encoded form (up to 4 bytes long). * \param val is an input only argument and should be of type uint32_t. It holds * a ucs4 encoded unicode character that is to be converted to UTF-8. If * val is given as a function it's executed only once. * \param tmp is a temporary variable and should be of type uint8_t. It * represents an intermediate value during conversion that is to be * outputted by PUT_BYTE. * \param PUT_BYTE writes the converted UTF-8 bytes to any proper destination. * It could be a function or a statement, and uses tmp as the input byte. * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be * executed up to 4 times for values in the valid UTF-8 range and up to * 7 times in the general case, depending on the length of the converted * unicode character. */ #define PUT_UTF8(val, tmp, PUT_BYTE)\ {\ int bytes, shift;\ uint32_t in = val;\ if (in < 0x80) {\ tmp = in;\ PUT_BYTE\ } else {\ bytes = (av_log2(in) + 4) / 5;\ shift = (bytes - 1) * 6;\ tmp = (256 - (256 >> bytes)) | (in >> shift);\ PUT_BYTE\ while (shift >= 6) {\ shift -= 6;\ tmp = 0x80 | ((in >> shift) & 0x3f);\ PUT_BYTE\ }\ }\ } #if defined(ARCH_X86) || defined(ARCH_POWERPC) || defined(ARCH_BFIN) #define AV_READ_TIME read_time #if defined(ARCH_X86_64) static inline uint64_t read_time(void) { uint64_t a, d; asm volatile( "rdtsc\n\t" : "=a" (a), "=d" (d) ); return (d << 32) | (a & 0xffffffff); } #elif defined(ARCH_X86_32) static inline long long read_time(void) { long long l; asm volatile( "rdtsc\n\t" : "=A" (l) ); return l; } #elif ARCH_BFIN static inline uint64_t read_time(void) { union { struct { unsigned lo; unsigned hi; } p; unsigned long long c; } t; asm volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi)); return t.c; } #else //FIXME check ppc64 static inline uint64_t read_time(void) { uint32_t tbu, tbl, temp; /* from section 2.2.1 of the 32-bit PowerPC PEM */ __asm__ __volatile__( "1:\n" "mftbu %2\n" "mftb %0\n" "mftbu %1\n" "cmpw %2,%1\n" "bne 1b\n" : "=r"(tbl), "=r"(tbu), "=r"(temp) : : "cc"); return (((uint64_t)tbu)<<32) | (uint64_t)tbl; } #endif #elif defined(HAVE_GETHRTIME) #define AV_READ_TIME gethrtime #endif #ifdef AV_READ_TIME #define START_TIMER \ uint64_t tend;\ uint64_t tstart= AV_READ_TIME();\ #define STOP_TIMER(id) \ tend= AV_READ_TIME();\ {\ static uint64_t tsum=0;\ static int tcount=0;\ static int tskip_count=0;\ if(tcount<2 || tend - tstart < FFMAX(8*tsum/tcount, 2000)){\ tsum+= tend - tstart;\ tcount++;\ }else\ tskip_count++;\ if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\ av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\ }\ } #else #define START_TIMER #define STOP_TIMER(id) {} #endif #endif /* FFMPEG_COMMON_H */