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source: webrtc/talk/media/base/cpuid.cc @ 0:4bda6873e34c

pub_scrub_3792 tip
Last change on this file since 0:4bda6873e34c was 0:4bda6873e34c, checked in by Michael Prittie <mprittie@…>, 6 years ago

Scrubbed password for publication.

File size: 3.2 KB
Line 
1/*
2 * libjingle
3 * Copyright 2011 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "talk/media/base/cpuid.h"
29
30#if !defined(DISABLE_YUV)
31#include "libyuv/cpu_id.h"
32#endif
33
34namespace cricket {
35
36bool CpuInfo::TestCpuFlag(int flag) {
37#if !defined(DISABLE_YUV)
38  return libyuv::TestCpuFlag(flag) ? true : false;
39#else
40  return false;
41#endif
42}
43
44void CpuInfo::MaskCpuFlagsForTest(int enable_flags) {
45#if !defined(DISABLE_YUV)
46  libyuv::MaskCpuFlags(enable_flags);
47#endif
48}
49
50// Detect an Intel Core I5 or better such as 4th generation Macbook Air.
51bool IsCoreIOrBetter() {
52#if !defined(DISABLE_YUV) && (defined(__i386__) || defined(__x86_64__) || \
53    defined(_M_IX86) || defined(_M_X64))
54  uint32 cpu_info[4];
55  libyuv::CpuId(0, 0, &cpu_info[0]);  // Function 0: Vendor ID
56  if (cpu_info[1] == 0x756e6547 && cpu_info[3] == 0x49656e69 &&
57      cpu_info[2] == 0x6c65746e) {  // GenuineIntel
58    // Detect CPU Family and Model
59    // 3:0 - Stepping
60    // 7:4 - Model
61    // 11:8 - Family
62    // 13:12 - Processor Type
63    // 19:16 - Extended Model
64    // 27:20 - Extended Family
65    libyuv::CpuId(1, 0, &cpu_info[0]);  // Function 1: Family and Model
66    int family = ((cpu_info[0] >> 8) & 0x0f) | ((cpu_info[0] >> 16) & 0xff0);
67    int model = ((cpu_info[0] >> 4) & 0x0f) | ((cpu_info[0] >> 12) & 0xf0);
68    // CpuFamily | CpuModel |  Name
69    //         6 |       14 |  Yonah -- Core
70    //         6 |       15 |  Merom -- Core 2
71    //         6 |       23 |  Penryn -- Core 2 (most common)
72    //         6 |       26 |  Nehalem -- Core i*
73    //         6 |       28 |  Atom
74    //         6 |       30 |  Lynnfield -- Core i*
75    //         6 |       37 |  Westmere -- Core i*
76    const int kAtom = 28;
77    const int kCore2 = 23;
78    if (family < 6 || family == 15 ||
79        (family == 6 && (model == kAtom || model <= kCore2))) {
80      return false;
81    }
82    return true;
83  }
84#endif
85  return false;
86}
87
88}  // namespace cricket
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