1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef ANDROID_MEDIA_REPORTPERFORMANCE_H
18 #define ANDROID_MEDIA_REPORTPERFORMANCE_H
19
20 #include <deque>
21 #include <map>
22 #include <vector>
23
24 namespace android {
25
26 // The String8 class is used by reportPerformance function
27 class String8;
28
29 namespace ReportPerformance {
30
31 constexpr int kMsPerSec = 1000;
32 constexpr int kSecPerMin = 60;
33
34 constexpr int kJiffyPerMs = 10; // time unit for histogram as a multiple of milliseconds
35
36 // stores a histogram: key: observed buffer period (multiple of jiffy). value: count
37 using Histogram = std::map<int, int>;
38
39 using msInterval = double;
40 using jiffyInterval = double;
41
42 using timestamp = int64_t;
43
44 using log_hash_t = uint64_t;
45
deltaMs(int64_t ns1,int64_t ns2)46 static inline int deltaMs(int64_t ns1, int64_t ns2) {
47 return (ns2 - ns1) / (1000 * 1000);
48 }
49
deltaJiffy(int64_t ns1,int64_t ns2)50 static inline int deltaJiffy(int64_t ns1, int64_t ns2) {
51 return (kJiffyPerMs * (ns2 - ns1)) / (1000 * 1000);
52 }
53
log2(uint32_t x)54 static inline uint32_t log2(uint32_t x) {
55 // This works for x > 0
56 return 31 - __builtin_clz(x);
57 }
58
59 // Writes outlier intervals, timestamps, peaks timestamps, and histograms to a file.
60 void writeToFile(const std::deque<std::pair<timestamp, Histogram>> &hists,
61 const std::deque<std::pair<msInterval, timestamp>> &outlierData,
62 const std::deque<timestamp> &peakTimestamps,
63 const char * kDirectory, bool append, int author, log_hash_t hash);
64
65 } // namespace ReportPerformance
66
67 } // namespace android
68
69 #endif // ANDROID_MEDIA_REPORTPERFORMANCE_H
70