/* * copyright (c) 2006 Michael Niedermayer * * 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 internal and external API header */ #ifndef AVUTIL_COMMON_H #define AVUTIL_COMMON_H #include #include #ifdef _MSC_VER #include #else #include #endif #include #include #include #include #include #include "attributes.h" //rounded division & 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 FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c) #define FFMIN(a,b) ((a) > (b) ? (b) : (a)) #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c) #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0])) #define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1)) /* misc math functions */ extern const uint8_t ff_log2_tab[256]; extern const uint8_t av_reverse[256]; static inline av_const int av_log2_c(unsigned int v) { int 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 av_const int av_log2_16bit_c(unsigned int v) { int n = 0; if (v & 0xff00) { v >>= 8; n += 8; } n += ff_log2_tab[v]; return n; } #ifdef HAVE_AV_CONFIG_H # include "config.h" # include "intmath.h" #endif #ifndef av_log2 # define av_log2 av_log2_c #endif #ifndef av_log2_16bit # define av_log2_16bit av_log2_16bit_c #endif /** * Clips 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 av_const int av_clip(int a, int amin, int amax) { if (a < amin) return amin; else if (a > amax) return amax; else return a; } /** * Clips a signed integer value into the 0-255 range. * @param a value to clip * @return clipped value */ static inline av_const uint8_t av_clip_uint8(int a) { if (a&(~0xFF)) return (-a)>>31; else return a; } /** * Clips a signed integer value into the 0-65535 range. * @param a value to clip * @return clipped value */ static inline av_const uint16_t av_clip_uint16(int a) { if (a&(~0xFFFF)) return (-a)>>31; else return a; } /** * Clips a signed integer value into the -32768,32767 range. * @param a value to clip * @return clipped value */ static inline av_const int16_t av_clip_int16(int a) { if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF; else return a; } /** * Clips a signed 64-bit integer value into the -2147483648,2147483647 range. * @param a value to clip * @return clipped value */ static inline av_const int32_t av_clipl_int32(int64_t a) { if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF; else return a; } /** * Clips a float 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 av_const float av_clipf(float a, float amin, float amax) { if (a < amin) return amin; else if (a > amax) return amax; else return a; } /** Computes ceil(log2(x)). * @param x value used to compute ceil(log2(x)) * @return computed ceiling of log2(x) */ static inline av_const int av_ceil_log2(int x) { return av_log2((x - 1) << 1); } #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 GET_UTF16(val, GET_16BIT, ERROR) * Converts a UTF-16 character (2 or 4 bytes) 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_16BIT gets two bytes of UTF-16 encoded data converted to native endianness. * It can be a function or a statement whose return value or evaluated value is of type * uint16_t. It will be executed up to 2 times. * \param ERROR action that should be taken when an invalid UTF-16 surrogate 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_UTF16(val, GET_16BIT, ERROR)\ val = GET_16BIT;\ {\ unsigned int hi = val - 0xD800;\ if (hi < 0x800) {\ val = GET_16BIT - 0xDC00;\ if (val > 0x3FFU || hi > 0x3FFU)\ ERROR\ val += (hi<<10) + 0x10000;\ }\ }\ /*! * \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 UCS-4 encoded Unicode character that is to be converted to UTF-8. If * val is given as a function it is 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 * output 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\ }\ }\ } /*! * \def PUT_UTF16(val, tmp, PUT_16BIT) * Converts a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes). * \param val is an input-only argument and should be of type uint32_t. It holds * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If * val is given as a function it is executed only once. * \param tmp is a temporary variable and should be of type uint16_t. It * represents an intermediate value during conversion that is to be * output by PUT_16BIT. * \param PUT_16BIT writes the converted UTF-16 data to any proper destination * in desired endianness. 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 1 or 2 times depending on input character. */ #define PUT_UTF16(val, tmp, PUT_16BIT)\ {\ uint32_t in = val;\ if (in < 0x10000) {\ tmp = in;\ PUT_16BIT\ } else {\ tmp = 0xD800 | ((in - 0x10000) >> 10);\ PUT_16BIT\ tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\ PUT_16BIT\ }\ }\ #include "mem.h" #ifdef HAVE_AV_CONFIG_H # include "internal.h" #endif /* HAVE_AV_CONFIG_H */ #endif /* AVUTIL_COMMON_H */