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