/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavutil/common.h
+ * @file
* common internal and external API header
*/
#ifndef AVUTIL_COMMON_H
#define AVUTIL_COMMON_H
-#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
+#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#ifdef HAVE_AV_CONFIG_H
-#include "config.h"
-#endif
-
-#ifdef __GNUC__
-# define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
-#else
-# define AV_GCC_VERSION_AT_LEAST(x,y) 0
-#endif
-
-#ifndef av_always_inline
-#if AV_GCC_VERSION_AT_LEAST(3,1)
-# define av_always_inline __attribute__((always_inline)) inline
-#else
-# define av_always_inline inline
-#endif
-#endif
-
-#ifndef av_noinline
-#if AV_GCC_VERSION_AT_LEAST(3,1)
-# define av_noinline __attribute__((noinline))
-#else
-# define av_noinline
-#endif
-#endif
-
-#ifndef av_pure
-#if AV_GCC_VERSION_AT_LEAST(3,1)
-# define av_pure __attribute__((pure))
-#else
-# define av_pure
-#endif
-#endif
-
-#ifndef av_const
-#if AV_GCC_VERSION_AT_LEAST(2,6)
-# define av_const __attribute__((const))
-#else
-# define av_const
-#endif
-#endif
-
-#ifndef av_cold
-#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
-# define av_cold __attribute__((cold))
-#else
-# define av_cold
-#endif
-#endif
-
-#ifndef av_flatten
-#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,1)
-# define av_flatten __attribute__((flatten))
-#else
-# define av_flatten
-#endif
-#endif
-
-#ifndef attribute_deprecated
-#if AV_GCC_VERSION_AT_LEAST(3,1)
-# define attribute_deprecated __attribute__((deprecated))
-#else
-# define attribute_deprecated
-#endif
-#endif
+#include "attributes.h"
+#include "macros.h"
+#include "version.h"
+#include "libavutil/avconfig.h"
-#ifndef av_unused
-#if defined(__GNUC__)
-# define av_unused __attribute__((unused))
+#if AV_HAVE_BIGENDIAN
+# define AV_NE(be, le) (be)
#else
-# define av_unused
-#endif
-#endif
-
-#ifndef av_uninit
-#if defined(__GNUC__) && !defined(__ICC)
-# define av_uninit(x) x=x
-#else
-# define av_uninit(x) x
-#endif
-#endif
-
-#ifdef HAVE_AV_CONFIG_H
-# include "intmath.h"
+# define AV_NE(be, le) (le)
#endif
//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))
+
+/**
+ * Fast a / (1 << b) rounded toward +inf, assuming a >= 0 and b >= 0.
+ */
+#define AV_CEIL_RSHIFT(a, b) \
+ (av_builtin_constant_p(b) ? ((a) + (1 << (b)) - 1) >> (b) \
+ : -((-(a)) >> (b)))
+
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
#define FFSIGN(a) ((a) > 0 ? 1 : -1)
#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];
+#ifdef HAVE_AV_CONFIG_H
+# include "config.h"
+# include "intmath.h"
+#endif
-#ifndef av_log2
-static inline av_const int av_log2(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];
+/* Pull in unguarded fallback defines at the end of this file. */
+#include "common.h"
- return n;
-}
+#ifndef av_log2
+av_const int av_log2(unsigned v);
#endif
#ifndef av_log2_16bit
-static inline av_const int av_log2_16bit(unsigned int v)
-{
- int n = 0;
- if (v & 0xff00) {
- v >>= 8;
- n += 8;
- }
- n += ff_log2_tab[v];
-
- return n;
-}
+av_const int av_log2_16bit(unsigned v);
#endif
/**
- * Clips a signed integer value into the amin-amax range.
+ * 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 av_const int av_clip(int a, int amin, int amax)
+static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
{
if (a < amin) return amin;
else if (a > amax) return amax;
}
/**
- * Clips a signed integer value into the 0-255 range.
+ * Clip a signed integer value into the 0-255 range.
+ * @param a value to clip
+ * @return clipped value
+ */
+static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
+{
+ if (a&(~0xFF)) return (-a)>>31;
+ else return a;
+}
+
+/**
+ * Clip a signed integer value into the -128,127 range.
* @param a value to clip
* @return clipped value
*/
-static inline av_const uint8_t av_clip_uint8(int a)
+static av_always_inline av_const int8_t av_clip_int8_c(int a)
{
- if (a&(~255)) return (-a)>>31;
- else return a;
+ if ((a+0x80) & ~0xFF) return (a>>31) ^ 0x7F;
+ else return a;
}
/**
- * Clips a signed integer value into the 0-65535 range.
+ * Clip 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)
+static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
{
- if (a&(~65535)) return (-a)>>31;
- else return a;
+ if (a&(~0xFFFF)) return (-a)>>31;
+ else return a;
}
/**
- * Clips a signed integer value into the -32768,32767 range.
+ * Clip 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)
+static av_always_inline av_const int16_t av_clip_int16_c(int a)
{
- if ((a+32768) & ~65535) return (a>>31) ^ 32767;
- else return a;
+ if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
+ else return a;
}
/**
- * Clips a float value into the amin-amax range.
+ * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
+ * @param a value to clip
+ * @return clipped value
+ */
+static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
+{
+ if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF;
+ else return a;
+}
+
+/**
+ * Clip a signed integer into the -(2^p),(2^p-1) range.
+ * @param a value to clip
+ * @param p bit position to clip at
+ * @return clipped value
+ */
+static av_always_inline av_const int av_clip_intp2_c(int a, int p)
+{
+ if ((a + (1 << p)) & ~((1 << (p + 1)) - 1))
+ return (a >> 31) ^ ((1 << p) - 1);
+ else
+ return a;
+}
+
+/**
+ * Clip a signed integer to an unsigned power of two range.
+ * @param a value to clip
+ * @param p bit position to clip at
+ * @return clipped value
+ */
+static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
+{
+ if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
+ else return a;
+}
+
+/**
+ * Add two signed 32-bit values with saturation.
+ *
+ * @param a one value
+ * @param b another value
+ * @return sum with signed saturation
+ */
+static av_always_inline int av_sat_add32_c(int a, int b)
+{
+ return av_clipl_int32((int64_t)a + b);
+}
+
+/**
+ * Add a doubled value to another value with saturation at both stages.
+ *
+ * @param a first value
+ * @param b value doubled and added to a
+ * @return sum with signed saturation
+ */
+static av_always_inline int av_sat_dadd32_c(int a, int b)
+{
+ return av_sat_add32(a, av_sat_add32(b, b));
+}
+
+/**
+ * Clip 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)
+static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
{
if (a < amin) return amin;
else if (a > amax) return amax;
else return a;
}
-/** Computes ceil(log2(x)).
+/** Compute 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)
+static av_always_inline av_const int av_ceil_log2_c(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.
+/**
+ * Count number of bits set to one in x
+ * @param x value to count bits of
+ * @return the number of bits set to one in x
+ */
+static av_always_inline av_const int av_popcount_c(uint32_t x)
+{
+ x -= (x >> 1) & 0x55555555;
+ x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
+ x = (x + (x >> 4)) & 0x0F0F0F0F;
+ x += x >> 8;
+ return (x + (x >> 16)) & 0x3F;
+}
+
+/**
+ * Count number of bits set to one in x
+ * @param x value to count bits of
+ * @return the number of bits set to one in x
+ */
+static av_always_inline av_const int av_popcount64_c(uint64_t x)
+{
+ return av_popcount(x) + av_popcount(x >> 32);
+}
+
+#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
+#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
+
+/**
+ * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
+ *
+ * @param val Output value, must be an lvalue of type uint32_t.
+ * @param GET_BYTE Expression reading one byte from the input.
+ * Evaluated up to 7 times (4 for the currently
+ * assigned Unicode range). With a memory buffer
+ * input, this could be *ptr++.
+ * @param ERROR Expression to be evaluated on invalid input,
+ * typically a goto statement.
*/
#define GET_UTF8(val, GET_BYTE, ERROR)\
val= GET_BYTE;\
{\
- int ones= 7 - av_log2(val ^ 255);\
- if(ones==1)\
+ uint32_t top = (val & 128) >> 1;\
+ if ((val & 0xc0) == 0x80)\
ERROR\
- val&= 127>>ones;\
- while(--ones > 0){\
+ while (val & top) {\
int tmp= GET_BYTE - 128;\
if(tmp>>6)\
ERROR\
val= (val<<6) + tmp;\
+ top <<= 5;\
}\
+ val &= (top << 1) - 1;\
}
-/*!
- * \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.
+/**
+ * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
+ *
+ * @param val Output value, must be an lvalue of type uint32_t.
+ * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
+ * to native byte order. Evaluated one or two times.
+ * @param ERROR Expression to be evaluated on invalid input,
+ * typically a goto statement.
*/
#define GET_UTF16(val, GET_16BIT, ERROR)\
val = GET_16BIT;\
}\
}\
-/*!
- * \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
+/**
+ * @def PUT_UTF8(val, tmp, PUT_BYTE)
+ * Convert 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
+ * @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.
+ * @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
}\
}
-/*!
- * \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
+/**
+ * @def PUT_UTF16(val, tmp, PUT_16BIT)
+ * Convert 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
+ * @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
+ * @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.
#endif /* HAVE_AV_CONFIG_H */
#endif /* AVUTIL_COMMON_H */
+
+/*
+ * The following definitions are outside the multiple inclusion guard
+ * to ensure they are immediately available in intmath.h.
+ */
+
+#ifndef av_ceil_log2
+# define av_ceil_log2 av_ceil_log2_c
+#endif
+#ifndef av_clip
+# define av_clip av_clip_c
+#endif
+#ifndef av_clip_uint8
+# define av_clip_uint8 av_clip_uint8_c
+#endif
+#ifndef av_clip_int8
+# define av_clip_int8 av_clip_int8_c
+#endif
+#ifndef av_clip_uint16
+# define av_clip_uint16 av_clip_uint16_c
+#endif
+#ifndef av_clip_int16
+# define av_clip_int16 av_clip_int16_c
+#endif
+#ifndef av_clipl_int32
+# define av_clipl_int32 av_clipl_int32_c
+#endif
+#ifndef av_clip_intp2
+# define av_clip_intp2 av_clip_intp2_c
+#endif
+#ifndef av_clip_uintp2
+# define av_clip_uintp2 av_clip_uintp2_c
+#endif
+#ifndef av_sat_add32
+# define av_sat_add32 av_sat_add32_c
+#endif
+#ifndef av_sat_dadd32
+# define av_sat_dadd32 av_sat_dadd32_c
+#endif
+#ifndef av_clipf
+# define av_clipf av_clipf_c
+#endif
+#ifndef av_popcount
+# define av_popcount av_popcount_c
+#endif
+#ifndef av_popcount64
+# define av_popcount64 av_popcount64_c
+#endif
projects / ffmpeg / blobdiff