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