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