1 /* 2 * Copyright (C) 2016 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_TAGMONITOR_H 18 #define ANDROID_SERVERS_CAMERA_TAGMONITOR_H 19 20 #include <vector> 21 #include <atomic> 22 #include <mutex> 23 24 #include <utils/RefBase.h> 25 #include <utils/String8.h> 26 #include <utils/Timers.h> 27 28 #include <media/RingBuffer.h> 29 #include <system/camera_metadata.h> 30 #include <camera/CameraMetadata.h> 31 32 namespace android { 33 34 /** 35 * A monitor for camera metadata values. 36 * Tracks changes to specified metadata values over time, keeping a circular 37 * buffer log that can be dumped at will. */ 38 class TagMonitor { 39 public: 40 enum eventSource { 41 REQUEST, 42 RESULT 43 }; 44 45 TagMonitor(); 46 47 // Parse tag name list (comma-separated) and if valid, enable monitoring 48 // If invalid, do nothing. 49 // Recognizes "3a" as a shortcut for enabling tracking 3A state, mode, and 50 // triggers 51 void parseTagsToMonitor(String8 tagNames); 52 53 // Disable monitoring; does not clear the event log 54 void disableMonitoring(); 55 56 // Scan through the metadata and update the monitoring information 57 void monitorMetadata(eventSource source, int64_t frameNumber, 58 nsecs_t timestamp, const CameraMetadata& metadata); 59 60 // Dump current event log to the provided fd 61 void dumpMonitoredMetadata(int fd); 62 63 private: 64 65 static void printData(int fd, const uint8_t *data_ptr, uint32_t tag, 66 int type, int count, int indentation); 67 68 std::atomic<bool> mMonitoringEnabled; 69 std::mutex mMonitorMutex; 70 71 // Current tags to monitor and record changes to 72 std::vector<uint32_t> mMonitoredTagList; 73 74 // Latest-seen values of tracked tags 75 CameraMetadata mLastMonitoredRequestValues; 76 CameraMetadata mLastMonitoredResultValues; 77 78 /** 79 * A monitoring event 80 * Stores a new metadata field value and the timestamp at which it changed. 81 * Copies the source metadata value array and frees it on destruct. 82 */ 83 struct MonitorEvent { 84 template<typename T> 85 MonitorEvent(eventSource src, uint32_t frameNumber, nsecs_t timestamp, 86 const T &newValue); 87 ~MonitorEvent(); 88 89 eventSource source; 90 uint32_t frameNumber; 91 nsecs_t timestamp; 92 uint32_t tag; 93 uint8_t type; 94 std::vector<uint8_t> newData; 95 }; 96 97 // A ring buffer for tracking the last kMaxMonitorEvents metadata changes 98 static const int kMaxMonitorEvents = 100; 99 RingBuffer<MonitorEvent> mMonitoringEvents; 100 101 // 3A fields to use with the "3a" option 102 static const char *k3aTags; 103 }; 104 105 } // namespace android 106 107 #endif 108