cpu.c
资源名称:X264CODEC.rar [点击查看]
上传用户:lctgjx
上传日期:2022-06-04
资源大小:8887k
文件大小:11k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*****************************************************************************
- * cpu.c: h264 encoder library
- *****************************************************************************
- * Copyright (C) 2003-2008 x264 project
- *
- * Authors: Loren Merritt <lorenm@u.washington.edu>
- * Laurent Aimar <fenrir@via.ecp.fr>
- * Jason Garrett-Glaser <darkshikari@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
- *****************************************************************************/
- #if defined(HAVE_PTHREAD) && defined(SYS_LINUX)
- #define _GNU_SOURCE
- #include <sched.h>
- #endif
- #ifdef SYS_BEOS
- #include <kernel/OS.h>
- #endif
- #if defined(SYS_MACOSX) || defined(SYS_FREEBSD)
- #include <sys/types.h>
- #include <sys/sysctl.h>
- #endif
- #ifdef SYS_OPENBSD
- #include <sys/param.h>
- #include <sys/sysctl.h>
- #include <machine/cpu.h>
- #endif
- #include "common.h"
- #include "cpu.h"
- const x264_cpu_name_t x264_cpu_names[] = {
- {"Altivec", X264_CPU_ALTIVEC},
- // {"MMX", X264_CPU_MMX}, // we don't support asm on mmx1 cpus anymore
- {"MMX2", X264_CPU_MMX|X264_CPU_MMXEXT},
- {"MMXEXT", X264_CPU_MMX|X264_CPU_MMXEXT},
- // {"SSE", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE}, // there are no sse1 functions in x264
- {"SSE2Slow",X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SSE2_IS_SLOW},
- {"SSE2", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2},
- {"SSE2Fast",X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SSE2_IS_FAST},
- {"SSE3", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SSE3},
- {"SSSE3", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SSE3|X264_CPU_SSSE3},
- {"FastShuffle", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SHUFFLE_IS_FAST},
- {"SSE4.1", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SSE3|X264_CPU_SSSE3|X264_CPU_SSE4},
- {"SSE4.2", X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2|X264_CPU_SSE3|X264_CPU_SSSE3|X264_CPU_SSE4|X264_CPU_SSE42},
- {"Cache32", X264_CPU_CACHELINE_32},
- {"Cache64", X264_CPU_CACHELINE_64},
- {"SSEMisalign", X264_CPU_SSE_MISALIGN},
- {"LZCNT", X264_CPU_LZCNT},
- {"Slow_mod4_stack", X264_CPU_STACK_MOD4},
- {"ARMv6", X264_CPU_ARMV6},
- {"NEON", X264_CPU_NEON},
- {"Fast_NEON_MRC", X264_CPU_FAST_NEON_MRC},
- {"", 0},
- };
- #if (defined(ARCH_PPC) && defined(SYS_LINUX)) || (defined(ARCH_ARM) && !defined(HAVE_NEON))
- #include <signal.h>
- #include <setjmp.h>
- static sigjmp_buf jmpbuf;
- static volatile sig_atomic_t canjump = 0;
- static void sigill_handler( int sig )
- {
- if( !canjump )
- {
- signal( sig, SIG_DFL );
- raise( sig );
- }
- canjump = 0;
- siglongjmp( jmpbuf, 1 );
- }
- #endif
- #ifdef HAVE_MMX
- extern int x264_cpu_cpuid_test( void );
- extern uint32_t x264_cpu_cpuid( uint32_t op, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx );
- uint32_t x264_cpu_detect( void )
- {
- uint32_t cpu = 0;
- uint32_t eax, ebx, ecx, edx;
- uint32_t vendor[4] = {0};
- int max_extended_cap;
- int cache;
- #ifndef ARCH_X86_64
- if( !x264_cpu_cpuid_test() )
- return 0;
- #endif
- x264_cpu_cpuid( 0, &eax, vendor+0, vendor+2, vendor+1 );
- if( eax == 0 )
- return 0;
- x264_cpu_cpuid( 1, &eax, &ebx, &ecx, &edx );
- if( edx&0x00800000 )
- cpu |= X264_CPU_MMX;
- else
- return 0;
- if( edx&0x02000000 )
- cpu |= X264_CPU_MMXEXT|X264_CPU_SSE;
- if( edx&0x04000000 )
- cpu |= X264_CPU_SSE2;
- if( ecx&0x00000001 )
- cpu |= X264_CPU_SSE3;
- if( ecx&0x00000200 )
- cpu |= X264_CPU_SSSE3;
- if( ecx&0x00080000 )
- cpu |= X264_CPU_SSE4;
- if( ecx&0x00100000 )
- cpu |= X264_CPU_SSE42;
- if( cpu & X264_CPU_SSSE3 )
- cpu |= X264_CPU_SSE2_IS_FAST;
- if( cpu & X264_CPU_SSE4 )
- cpu |= X264_CPU_SHUFFLE_IS_FAST;
- x264_cpu_cpuid( 0x80000000, &eax, &ebx, &ecx, &edx );
- max_extended_cap = eax;
- if( !strcmp((char*)vendor, "AuthenticAMD") && max_extended_cap >= 0x80000001 )
- {
- x264_cpu_cpuid( 0x80000001, &eax, &ebx, &ecx, &edx );
- if( edx&0x00400000 )
- cpu |= X264_CPU_MMXEXT;
- if( cpu & X264_CPU_SSE2 )
- {
- if( ecx&0x00000040 ) /* SSE4a */
- {
- cpu |= X264_CPU_SSE2_IS_FAST;
- cpu |= X264_CPU_SSE_MISALIGN;
- cpu |= X264_CPU_LZCNT;
- cpu |= X264_CPU_SHUFFLE_IS_FAST;
- x264_cpu_mask_misalign_sse();
- }
- else
- cpu |= X264_CPU_SSE2_IS_SLOW;
- }
- }
- if( !strcmp((char*)vendor, "GenuineIntel") )
- {
- int family, model, stepping;
- x264_cpu_cpuid( 1, &eax, &ebx, &ecx, &edx );
- family = ((eax>>8)&0xf) + ((eax>>20)&0xff);
- model = ((eax>>4)&0xf) + ((eax>>12)&0xf0);
- stepping = eax&0xf;
- /* 6/9 (pentium-m "banias"), 6/13 (pentium-m "dothan"), and 6/14 (core1 "yonah")
- * theoretically support sse2, but it's significantly slower than mmx for
- * almost all of x264's functions, so let's just pretend they don't. */
- if( family==6 && (model==9 || model==13 || model==14) )
- {
- cpu &= ~(X264_CPU_SSE2|X264_CPU_SSE3);
- assert(!(cpu&(X264_CPU_SSSE3|X264_CPU_SSE4)));
- }
- }
- if( (!strcmp((char*)vendor, "GenuineIntel") || !strcmp((char*)vendor, "CyrixInstead")) && !(cpu&X264_CPU_SSE42))
- {
- /* cacheline size is specified in 3 places, any of which may be missing */
- x264_cpu_cpuid( 1, &eax, &ebx, &ecx, &edx );
- cache = (ebx&0xff00)>>5; // cflush size
- if( !cache && max_extended_cap >= 0x80000006 )
- {
- x264_cpu_cpuid( 0x80000006, &eax, &ebx, &ecx, &edx );
- cache = ecx&0xff; // cacheline size
- }
- if( !cache )
- {
- // Cache and TLB Information
- static const char cache32_ids[] = { 0x0a, 0x0c, 0x41, 0x42, 0x43, 0x44, 0x45, 0x82, 0x83, 0x84, 0x85, 0 };
- static const char cache64_ids[] = { 0x22, 0x23, 0x25, 0x29, 0x2c, 0x46, 0x47, 0x49, 0x60, 0x66, 0x67, 0x68, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7c, 0x7f, 0x86, 0x87, 0 };
- uint32_t buf[4];
- int max, i=0, j;
- do {
- x264_cpu_cpuid( 2, buf+0, buf+1, buf+2, buf+3 );
- max = buf[0]&0xff;
- buf[0] &= ~0xff;
- for(j=0; j<4; j++)
- if( !(buf[j]>>31) )
- while( buf[j] )
- {
- if( strchr( cache32_ids, buf[j]&0xff ) )
- cache = 32;
- if( strchr( cache64_ids, buf[j]&0xff ) )
- cache = 64;
- buf[j] >>= 8;
- }
- } while( ++i < max );
- }
- if( cache == 32 )
- cpu |= X264_CPU_CACHELINE_32;
- else if( cache == 64 )
- cpu |= X264_CPU_CACHELINE_64;
- else
- fprintf( stderr, "x264 [warning]: unable to determine cacheline sizen" );
- }
- #ifdef BROKEN_STACK_ALIGNMENT
- cpu |= X264_CPU_STACK_MOD4;
- #endif
- return cpu;
- }
- #elif defined( ARCH_PPC )
- #if defined(SYS_MACOSX) || defined(SYS_OPENBSD)
- #include <sys/sysctl.h>
- uint32_t x264_cpu_detect( void )
- {
- /* Thank you VLC */
- uint32_t cpu = 0;
- #ifdef SYS_OPENBSD
- int selectors[2] = { CTL_MACHDEP, CPU_ALTIVEC };
- #else
- int selectors[2] = { CTL_HW, HW_VECTORUNIT };
- #endif
- int has_altivec = 0;
- size_t length = sizeof( has_altivec );
- int error = sysctl( selectors, 2, &has_altivec, &length, NULL, 0 );
- if( error == 0 && has_altivec != 0 )
- {
- cpu |= X264_CPU_ALTIVEC;
- }
- return cpu;
- }
- #elif defined( SYS_LINUX )
- uint32_t x264_cpu_detect( void )
- {
- static void (* oldsig)( int );
- oldsig = signal( SIGILL, sigill_handler );
- if( sigsetjmp( jmpbuf, 1 ) )
- {
- signal( SIGILL, oldsig );
- return 0;
- }
- canjump = 1;
- asm volatile( "mtspr 256, %0nt"
- "vand 0, 0, 0nt"
- :
- : "r"(-1) );
- canjump = 0;
- signal( SIGILL, oldsig );
- return X264_CPU_ALTIVEC;
- }
- #endif
- #elif defined( ARCH_ARM )
- void x264_cpu_neon_test();
- int x264_cpu_fast_neon_mrc_test();
- uint32_t x264_cpu_detect( void )
- {
- int flags = 0;
- #ifdef HAVE_ARMV6
- flags |= X264_CPU_ARMV6;
- // don't do this hack if compiled with -mfpu=neon
- #ifndef HAVE_NEON
- static void (* oldsig)( int );
- oldsig = signal( SIGILL, sigill_handler );
- if( sigsetjmp( jmpbuf, 1 ) )
- {
- signal( SIGILL, oldsig );
- return flags;
- }
- canjump = 1;
- x264_cpu_neon_test();
- canjump = 0;
- signal( SIGILL, oldsig );
- #endif
- flags |= X264_CPU_NEON;
- // fast neon -> arm (Cortex-A9) detection relies on user access to the
- // cycle counter; this assumes ARMv7 performance counters.
- // NEON requires at least ARMv7, ARMv8 may require changes here, but
- // hopefully this hacky detection method will have been replaced by then.
- // Note that there is potential for a race condition if another program or
- // x264 instance disables or reinits the counters while x264 is using them,
- // which may result in incorrect detection and the counters stuck enabled.
- flags |= x264_cpu_fast_neon_mrc_test() ? X264_CPU_FAST_NEON_MRC : 0;
- // TODO: write dual issue test? currently it's A8 (dual issue) vs. A9 (fast mrc)
- #endif
- return flags;
- }
- #else
- uint32_t x264_cpu_detect( void )
- {
- return 0;
- }
- #endif
- #ifndef HAVE_MMX
- void x264_emms( void )
- {
- }
- #endif
- int x264_cpu_num_processors( void )
- {
- #if !defined(HAVE_PTHREAD)
- return 1;
- #elif defined(_WIN32)
- return pthread_num_processors_np();
- #elif defined(SYS_LINUX)
- unsigned int bit;
- int np;
- cpu_set_t p_aff;
- memset( &p_aff, 0, sizeof(p_aff) );
- sched_getaffinity( 0, sizeof(p_aff), &p_aff );
- for( np = 0, bit = 0; bit < sizeof(p_aff); bit++ )
- np += (((uint8_t *)&p_aff)[bit / 8] >> (bit % 8)) & 1;
- return np;
- #elif defined(SYS_BEOS)
- system_info info;
- get_system_info( &info );
- return info.cpu_count;
- #elif defined(SYS_MACOSX) || defined(SYS_FREEBSD) || defined(SYS_OPENBSD)
- int numberOfCPUs;
- size_t length = sizeof( numberOfCPUs );
- #ifdef SYS_OPENBSD
- int mib[2] = { CTL_HW, HW_NCPU };
- if( sysctl(mib, 2, &numberOfCPUs, &length, NULL, 0) )
- #else
- if( sysctlbyname("hw.ncpu", &numberOfCPUs, &length, NULL, 0) )
- #endif
- {
- numberOfCPUs = 1;
- }
- return numberOfCPUs;
- #else
- return 1;
- #endif
- }