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
25namespace android {
26
27// Histogram for camera latency characteristic
28class CameraLatencyHistogram {
29public:
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, ...);
37private:
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