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 #include <unordered_map> 24 25 #include <utils/RefBase.h> 26 #include <utils/String8.h> 27 #include <utils/Timers.h> 28 29 #include <media/RingBuffer.h> 30 #include <system/camera_metadata.h> 31 #include <system/camera_vendor_tags.h> 32 #include <camera/CameraMetadata.h> 33 34 namespace android { 35 36 /** 37 * A monitor for camera metadata values. 38 * Tracks changes to specified metadata values over time, keeping a circular 39 * buffer log that can be dumped at will. */ 40 class TagMonitor { 41 public: 42 43 // Monitor argument 44 static const String16 kMonitorOption; 45 46 enum eventSource { 47 REQUEST, 48 RESULT 49 }; 50 51 TagMonitor(); 52 initialize(metadata_vendor_id_t id)53 void initialize(metadata_vendor_id_t id) { mVendorTagId = id; } 54 55 // Parse tag name list (comma-separated) and if valid, enable monitoring 56 // If invalid, do nothing. 57 // Recognizes "3a" as a shortcut for enabling tracking 3A state, mode, and 58 // triggers 59 void parseTagsToMonitor(String8 tagNames); 60 61 // Disable monitoring; does not clear the event log 62 void disableMonitoring(); 63 64 // Scan through the metadata and update the monitoring information 65 void monitorMetadata(eventSource source, int64_t frameNumber, 66 nsecs_t timestamp, const CameraMetadata& metadata, 67 const std::unordered_map<std::string, CameraMetadata>& physicalMetadata); 68 69 // Dump current event log to the provided fd 70 void dumpMonitoredMetadata(int fd); 71 72 private: 73 74 static void printData(int fd, const uint8_t *data_ptr, uint32_t tag, 75 int type, int count, int indentation); 76 77 void monitorSingleMetadata(TagMonitor::eventSource source, int64_t frameNumber, 78 nsecs_t timestamp, const std::string& cameraId, uint32_t tag, 79 const CameraMetadata& metadata); 80 81 std::atomic<bool> mMonitoringEnabled; 82 std::mutex mMonitorMutex; 83 84 // Current tags to monitor and record changes to 85 std::vector<uint32_t> mMonitoredTagList; 86 87 // Latest-seen values of tracked tags 88 CameraMetadata mLastMonitoredRequestValues; 89 CameraMetadata mLastMonitoredResultValues; 90 91 std::unordered_map<std::string, CameraMetadata> mLastMonitoredPhysicalRequestKeys; 92 std::unordered_map<std::string, CameraMetadata> mLastMonitoredPhysicalResultKeys; 93 94 /** 95 * A monitoring event 96 * Stores a new metadata field value and the timestamp at which it changed. 97 * Copies the source metadata value array and frees it on destruct. 98 */ 99 struct MonitorEvent { 100 template<typename T> 101 MonitorEvent(eventSource src, uint32_t frameNumber, nsecs_t timestamp, 102 const T &newValue, const std::string& cameraId); 103 ~MonitorEvent(); 104 105 eventSource source; 106 uint32_t frameNumber; 107 nsecs_t timestamp; 108 uint32_t tag; 109 uint8_t type; 110 std::vector<uint8_t> newData; 111 std::string cameraId; 112 }; 113 114 // A ring buffer for tracking the last kMaxMonitorEvents metadata changes 115 static const int kMaxMonitorEvents = 100; 116 RingBuffer<MonitorEvent> mMonitoringEvents; 117 118 // 3A fields to use with the "3a" option 119 static const char *k3aTags; 120 metadata_vendor_id_t mVendorTagId; 121 }; 122 123 } // namespace android 124 125 #endif 126