FFmpeg  1.2.12
Macros | Functions
cpu.h File Reference
#include "attributes.h"

Go to the source code of this file.

Macros

#define AV_CPU_FLAG_FORCE   0x80000000 /* force usage of selected flags (OR) */
#define AV_CPU_FLAG_MMX   0x0001
 standard MMX
#define AV_CPU_FLAG_MMXEXT   0x0002
 SSE integer functions or AMD MMX ext.
#define AV_CPU_FLAG_MMX2   0x0002
 SSE integer functions or AMD MMX ext.
#define AV_CPU_FLAG_3DNOW   0x0004
 AMD 3DNOW.
#define AV_CPU_FLAG_SSE   0x0008
 SSE functions.
#define AV_CPU_FLAG_SSE2   0x0010
 PIV SSE2 functions.
#define AV_CPU_FLAG_SSE2SLOW   0x40000000
 SSE2 supported, but usually not faster.
#define AV_CPU_FLAG_3DNOWEXT   0x0020
 AMD 3DNowExt.
#define AV_CPU_FLAG_SSE3   0x0040
 Prescott SSE3 functions.
#define AV_CPU_FLAG_SSE3SLOW   0x20000000
 SSE3 supported, but usually not faster.
#define AV_CPU_FLAG_SSSE3   0x0080
 Conroe SSSE3 functions.
#define AV_CPU_FLAG_ATOM   0x10000000
 Atom processor, some SSSE3 instructions are slower.
#define AV_CPU_FLAG_SSE4   0x0100
 Penryn SSE4.1 functions.
#define AV_CPU_FLAG_SSE42   0x0200
 Nehalem SSE4.2 functions.
#define AV_CPU_FLAG_AVX   0x4000
 AVX functions: requires OS support even if YMM registers aren't used.
#define AV_CPU_FLAG_XOP   0x0400
 Bulldozer XOP functions.
#define AV_CPU_FLAG_FMA4   0x0800
 Bulldozer FMA4 functions.
#define AV_CPU_FLAG_CMOV   0x1001000
 supports cmov instruction
#define AV_CPU_FLAG_ALTIVEC   0x0001
 standard
#define AV_CPU_FLAG_ARMV5TE   (1 << 0)
#define AV_CPU_FLAG_ARMV6   (1 << 1)
#define AV_CPU_FLAG_ARMV6T2   (1 << 2)
#define AV_CPU_FLAG_VFP   (1 << 3)
#define AV_CPU_FLAG_VFPV3   (1 << 4)
#define AV_CPU_FLAG_NEON   (1 << 5)

Functions

int av_get_cpu_flags (void)
 Return the flags which specify extensions supported by the CPU.
void av_force_cpu_flags (int flags)
 Disables cpu detection and forces the specified flags.
attribute_deprecated void av_set_cpu_flags_mask (int mask)
 Set a mask on flags returned by av_get_cpu_flags().
attribute_deprecated int av_parse_cpu_flags (const char *s)
 Parse CPU flags from a string.
int av_parse_cpu_caps (unsigned *flags, const char *s)
 Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
int ff_get_cpu_flags_arm (void)
int ff_get_cpu_flags_ppc (void)
 This function MAY rely on signal() or fork() in order to make sure AltiVec is present.
int ff_get_cpu_flags_x86 (void)

Macro Definition Documentation

#define AV_CPU_FLAG_3DNOW   0x0004

AMD 3DNOW.

Definition at line 32 of file cpu.h.

#define AV_CPU_FLAG_3DNOWEXT   0x0020

AMD 3DNowExt.

Definition at line 36 of file cpu.h.

#define AV_CPU_FLAG_ALTIVEC   0x0001

standard

Definition at line 52 of file cpu.h.

#define AV_CPU_FLAG_ARMV5TE   (1 << 0)

Definition at line 54 of file cpu.h.

#define AV_CPU_FLAG_ARMV6   (1 << 1)

Definition at line 55 of file cpu.h.

#define AV_CPU_FLAG_ARMV6T2   (1 << 2)

Definition at line 56 of file cpu.h.

#define AV_CPU_FLAG_ATOM   0x10000000

Atom processor, some SSSE3 instructions are slower.

Definition at line 40 of file cpu.h.

#define AV_CPU_FLAG_AVX   0x4000

AVX functions: requires OS support even if YMM registers aren't used.

Definition at line 43 of file cpu.h.

#define AV_CPU_FLAG_CMOV   0x1001000

supports cmov instruction

Definition at line 47 of file cpu.h.

#define AV_CPU_FLAG_FMA4   0x0800

Bulldozer FMA4 functions.

Definition at line 45 of file cpu.h.

#define AV_CPU_FLAG_FORCE   0x80000000 /* force usage of selected flags (OR) */

Definition at line 26 of file cpu.h.

#define AV_CPU_FLAG_MMX   0x0001

standard MMX

Definition at line 29 of file cpu.h.

#define AV_CPU_FLAG_MMX2   0x0002

SSE integer functions or AMD MMX ext.

Definition at line 31 of file cpu.h.

#define AV_CPU_FLAG_MMXEXT   0x0002

SSE integer functions or AMD MMX ext.

Definition at line 30 of file cpu.h.

#define AV_CPU_FLAG_NEON   (1 << 5)

Definition at line 59 of file cpu.h.

#define AV_CPU_FLAG_SSE   0x0008

SSE functions.

Definition at line 33 of file cpu.h.

#define AV_CPU_FLAG_SSE2   0x0010

PIV SSE2 functions.

Definition at line 34 of file cpu.h.

#define AV_CPU_FLAG_SSE2SLOW   0x40000000

SSE2 supported, but usually not faster.

Definition at line 35 of file cpu.h.

#define AV_CPU_FLAG_SSE3   0x0040

Prescott SSE3 functions.

Definition at line 37 of file cpu.h.

#define AV_CPU_FLAG_SSE3SLOW   0x20000000

SSE3 supported, but usually not faster.

Definition at line 38 of file cpu.h.

#define AV_CPU_FLAG_SSE4   0x0100

Penryn SSE4.1 functions.

Definition at line 41 of file cpu.h.

#define AV_CPU_FLAG_SSE42   0x0200

Nehalem SSE4.2 functions.

Definition at line 42 of file cpu.h.

#define AV_CPU_FLAG_SSSE3   0x0080

Conroe SSSE3 functions.

Definition at line 39 of file cpu.h.

#define AV_CPU_FLAG_VFP   (1 << 3)

Definition at line 57 of file cpu.h.

#define AV_CPU_FLAG_VFPV3   (1 << 4)

Definition at line 58 of file cpu.h.

#define AV_CPU_FLAG_XOP   0x0400

Bulldozer XOP functions.

Definition at line 44 of file cpu.h.

Function Documentation

void av_force_cpu_flags ( int  flags)

Disables cpu detection and forces the specified flags.

-1 is a special case that disables forcing of specific flags.

Definition at line 25 of file cpu.c.

int av_get_cpu_flags ( void  )

Return the flags which specify extensions supported by the CPU.

The returned value is affected by av_force_cpu_flags() if that was used before. So av_get_cpu_flags() can easily be used in a application to detect the enabled cpu flags.

Definition at line 48 of file cpu.c.

int av_parse_cpu_caps ( unsigned *  flags,
const char *  s 
)

Parse CPU caps from a string and update the given AV_CPU_* flags based on that.

Returns
negative on error.

Definition at line 132 of file cpu.c.

attribute_deprecated int av_parse_cpu_flags ( const char *  s)

Parse CPU flags from a string.

The returned flags contain the specified flags as well as related unspecified flags.

This function exists only for compatibility with libav. Please use av_parse_cpu_caps() when possible.

Returns
a combination of AV_CPU_* flags, negative on error.

Definition at line 68 of file cpu.c.

attribute_deprecated void av_set_cpu_flags_mask ( int  mask)

Set a mask on flags returned by av_get_cpu_flags().

This function is mainly useful for testing. Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible

Warning
this function is not thread safe.

Definition at line 61 of file cpu.c.

int ff_get_cpu_flags_arm ( void  )

Definition at line 136 of file cpu.c.

int ff_get_cpu_flags_ppc ( void  )

This function MAY rely on signal() or fork() in order to make sure AltiVec is present.

Definition at line 38 of file cpu.c.

int ff_get_cpu_flags_x86 ( void  )

Definition at line 89 of file cpu.c.