virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-01-13 21:28:01 +02:00
Code Issues Releases Activity

sqrt

Browse Source 
MAX, MIN

Originally committed as revision 637 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-06-02 12:11:44 +00:00
parent ab00685a75
commit 7fd08ac1d1
1 changed files with 36 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
libavcodec/common.h
View File

@ -151,6 +151,8 @@ inline void dprintf(const char* fmt,...) {}
/* assume b>0 */ /* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
#define ABS(a) ((a) >= 0 ? (a) : (-(a))) #define ABS(a) ((a) >= 0 ? (a) : (-(a)))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) > (b) ? (b) : (a))
/* bit output */ /* bit output */
@ -420,7 +422,6 @@ static inline void jput_bits(PutBitContext *s, int n, int value)
} }
#endif #endif
static inline uint8_t* pbBufPtr(PutBitContext *s) static inline uint8_t* pbBufPtr(PutBitContext *s)
{ {
#ifdef ALT_BITSTREAM_WRITER #ifdef ALT_BITSTREAM_WRITER
@ -897,6 +898,40 @@ void __av_freep(void **ptr);
/* math */ /* math */
int ff_gcd(int a, int b); int ff_gcd(int a, int b);
static inline int ff_sqrt(int a)
{
int ret=0;
int s;
int ret_sq=0;
for(s=15; s>=0; s--){
int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
if(b<=a){
ret_sq=b;
ret+= 1<<s;
}
}
return ret;
}
#if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
#define COPY3_IF_LT(x,y,a,b,c,d)\
asm volatile (\
"cmpl %0, %3 \n\t"\
"cmovl %3, %0 \n\t"\
"cmovl %4, %1 \n\t"\
"cmovl %5, %2 \n\t"\
: "+r" (x), "+r" (a), "+r" (c)\
: "r" (y), "r" (b), "r" (d)\
);
#else
#define COPY3_IF_LT(x,y,a,b,c,d)\
if((y)<(x)){\
(x)=(y);\
(a)=(b);\
(c)=(d);\
}
#endif
#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d) #define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
#endif #endif