*/
/**
- * @file common.h
+ * @file libavutil/common.h
* 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 <stdio.h>
+#include <stdlib.h>
+#include <string.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 */
+#include "config.h"
+#endif
-#define AV_GCC_VERSION_AT_LEAST(x,y) (defined(__GNUC__) && (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y))
+#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)
#endif
#ifndef av_cold
-#if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,3)
+#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
# define av_cold __attribute__((cold))
#else
# define av_cold
#endif
#endif
-#ifdef HAVE_AV_CONFIG_H
-# include "internal.h"
-#endif /* HAVE_AV_CONFIG_H */
+#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)
#endif
#endif
-#include "mem.h"
+#ifndef av_uninit
+#if defined(__GNUC__) && !defined(__ICC)
+# define av_uninit(x) x=x
+#else
+# define av_uninit(x) x
+#endif
+#endif
-//rounded divison & shift
+//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 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];
return n;
}
-/* median of 3 */
-static inline av_const int mid_pred(int a, int b, int c)
-{
-#if 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
+ * 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
}
/**
- * clip a signed integer value into the 0-255 range
+ * Clips a signed integer value into the 0-255 range.
* @param a value to clip
* @return clipped value
*/
}
/**
- * clip a signed integer value into the -32768,32767 range
+ * 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&(~65535)) return (-a)>>31;
+ else return a;
+}
+
+/**
+ * Clips a signed integer value into the -32768,32767 range.
* @param a value to clip
* @return clipped value
*/
}
/**
- * clip a float value into the amin-amax range
+ * 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
/*!
* \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
+ * 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
/*!
* \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.
+ * 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
- * outputted by PUT_BYTE.
+ * 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.
+ * Unicode character.
*/
#define PUT_UTF8(val, tmp, PUT_BYTE)\
{\
}\
}
+#include "mem.h"
+
+#ifdef HAVE_AV_CONFIG_H
+# include "internal.h"
+#endif /* HAVE_AV_CONFIG_H */
+
#endif /* AVUTIL_COMMON_H */
projects / ffmpeg / blobdiff