rhubarb-lip-sync/rhubarb/lib/webrtc-8d2248ff/webrtc/media/base/cpuid.cc

64 lines
2.1 KiB
C++

/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/media/base/cpuid.h"
#include "libyuv/cpu_id.h"
namespace cricket {
bool CpuInfo::TestCpuFlag(int flag) {
return libyuv::TestCpuFlag(flag) ? true : false;
}
void CpuInfo::MaskCpuFlagsForTest(int enable_flags) {
libyuv::MaskCpuFlags(enable_flags);
}
// Detect an Intel Core I5 or better such as 4th generation Macbook Air.
bool IsCoreIOrBetter() {
#if defined(__i386__) || defined(__x86_64__) || \
defined(_M_IX86) || defined(_M_X64)
uint32_t cpu_info[4];
libyuv::CpuId(0, 0, &cpu_info[0]); // Function 0: Vendor ID
if (cpu_info[1] == 0x756e6547 && cpu_info[3] == 0x49656e69 &&
cpu_info[2] == 0x6c65746e) { // GenuineIntel
// Detect CPU Family and Model
// 3:0 - Stepping
// 7:4 - Model
// 11:8 - Family
// 13:12 - Processor Type
// 19:16 - Extended Model
// 27:20 - Extended Family
libyuv::CpuId(1, 0, &cpu_info[0]); // Function 1: Family and Model
int family = ((cpu_info[0] >> 8) & 0x0f) | ((cpu_info[0] >> 16) & 0xff0);
int model = ((cpu_info[0] >> 4) & 0x0f) | ((cpu_info[0] >> 12) & 0xf0);
// CpuFamily | CpuModel | Name
// 6 | 14 | Yonah -- Core
// 6 | 15 | Merom -- Core 2
// 6 | 23 | Penryn -- Core 2 (most common)
// 6 | 26 | Nehalem -- Core i*
// 6 | 28 | Atom
// 6 | 30 | Lynnfield -- Core i*
// 6 | 37 | Westmere -- Core i*
const int kAtom = 28;
const int kCore2 = 23;
if (family < 6 || family == 15 ||
(family == 6 && (model == kAtom || model <= kCore2))) {
return false;
}
return true;
}
#endif
return false;
}
} // namespace cricket