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_SERVERS_CAMERA_LATENCY_HISTOGRAM_H_
18 #define ANDROID_SERVERS_CAMERA_LATENCY_HISTOGRAM_H_
19 
20 #include <vector>
21 
22 #include <utils/Timers.h>
23 #include <utils/Mutex.h>
24 
25 namespace android {
26 
27 // Histogram for camera latency characteristic
28 class CameraLatencyHistogram {
29 public:
30     CameraLatencyHistogram() = delete;
31     CameraLatencyHistogram(int32_t binSizeMs, int32_t binCount=10);
32     void add(nsecs_t start, nsecs_t end);
33     void reset();
34 
35     void dump(int fd, const char* name) const;
36     void log(const char* format, ...);
37 private:
38     int32_t mBinSizeMs;
39     int32_t mBinCount;
40     std::vector<int64_t> mBins;
41     uint64_t mTotalCount;
42 
43     void formatHistogramText(String8& lineBins, String8& lineBinCounts) const;
44 }; // class CameraLatencyHistogram
45 
46 }; // namespace android
47 
48 #endif // ANDROID_SERVERS_CAMERA_LATENCY_HISTOGRAM_H_
49