1 /* 2 * Copyright (C) 2015 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 CAMERA_H_ 18 #define CAMERA_H_ 19 20 #include <hardware/hardware.h> 21 #include <hardware/camera3.h> 22 #include <utils/Mutex.h> 23 #include <utils/Vector.h> 24 #include "Metadata.h" 25 #include <sync/sync.h> 26 #include "Stream.h" 27 28 #define CAMERA_SYNC_TIMEOUT_MS 5000 29 30 namespace usb_camera_hal { 31 // Camera represents a physical camera on a device. 32 // This is constructed when the HAL module is loaded, one per physical camera. 33 // It is opened by the framework, and must be closed before it can be opened 34 // again. 35 // This is an abstract class, containing all logic and data shared between all 36 // camera devices. 37 class Camera { 38 public: 39 // id is used to distinguish cameras. 0 <= id < NUM_CAMERAS. 40 // module is a handle to the HAL module, used when the device is opened. 41 explicit Camera(int id); 42 virtual ~Camera(); 43 44 // Common Camera Device Operations (see <hardware/camera_common.h>) 45 int open(const hw_module_t *module, hw_device_t **device); 46 int getInfo(struct camera_info *info); 47 int close(); 48 49 // Camera v3 Device Operations (see <hardware/camera3.h>) 50 int initialize(const camera3_callback_ops_t *callback_ops); 51 int configureStreams(camera3_stream_configuration_t *stream_list); 52 const camera_metadata_t *constructDefaultRequestSettings(int type); 53 int processCaptureRequest(camera3_capture_request_t *request); 54 int flush(); 55 void dump(int fd); 56 57 // Update static camera characteristics. This method could be called by 58 // HAL hotplug thread when camera is plugged. 59 void updateInfo(); 60 61 protected: 62 // Initialize static camera characteristics. 63 virtual int initStaticInfo() = 0; 64 // Verify settings are valid for a capture 65 virtual bool isValidCaptureSettings(const camera_metadata_t *) = 0; 66 // Separate open method for individual devices 67 virtual int openDevice() = 0; 68 // Separate initialization method for individual devices when opened 69 virtual int initDevice() = 0; 70 // Flush camera pipeline for each individual device 71 virtual int flushDevice() = 0; 72 // Separate close method for individual devices 73 virtual int closeDevice() = 0; 74 // Capture and file an output buffer for an input buffer. 75 virtual int processCaptureBuffer(const camera3_stream_buffer_t *in, 76 camera3_stream_buffer_t *out) = 0; 77 // Accessor method used by initDevice() to set the templates' metadata 78 int setTemplate(int type, camera_metadata_t *settings); 79 // Prettyprint template names 80 const char* templateToString(int type); 81 // Process an output buffer 82 83 // Identifier used by framework to distinguish cameras 84 const int mId; 85 // Metadata containing persistent camera characteristics 86 Metadata mMetadata; 87 // camera_metadata structure containing static characteristics 88 camera_metadata_t *mStaticInfo; 89 90 private: 91 // Camera device handle returned to framework for use 92 camera3_device_t mDevice; 93 // Reuse a stream already created by this device. Must be called with mDeviceLock held. 94 Stream *reuseStreamLocked(camera3_stream_t *astream); 95 // Destroy all streams in a stream array, and the array itself. Must be called with 96 // mDeviceLock held. 97 void destroyStreamsLocked(android::Vector<Stream *> &streams); 98 // Verify a set of streams is valid in aggregate. Must be called with mDeviceLock held. 99 bool isValidStreamSetLocked(const android::Vector<Stream *> &streams); 100 // Calculate usage and max_bufs of each stream. Must be called with mDeviceLock held. 101 void setupStreamsLocked(android::Vector<Stream *> &streams); 102 // Update new settings for re-use and clean up old settings. Must be called with 103 // mDeviceLock held. 104 void updateSettingsLocked(const camera_metadata_t *new_settings); 105 // Send a shutter notify message with start of exposure time 106 void notifyShutter(uint32_t frame_number, uint64_t timestamp); 107 // Is type a valid template type (and valid index into mTemplates) 108 bool isValidTemplateType(int type); 109 110 // Busy flag indicates camera is in use 111 bool mBusy; 112 // Camera device operations handle shared by all devices 113 const static camera3_device_ops_t sOps; 114 // Methods used to call back into the framework 115 const camera3_callback_ops_t *mCallbackOps; 116 // Lock protecting the Camera object for modifications 117 android::Mutex mDeviceLock; 118 // Lock protecting only static camera characteristics, which may 119 // be accessed without the camera device open 120 android::Mutex mStaticInfoLock; 121 // Array of handles to streams currently in use by the device 122 android::Vector<Stream *> mStreams; 123 // Static array of standard camera settings templates 124 camera_metadata_t *mTemplates[CAMERA3_TEMPLATE_COUNT]; 125 // Most recent request settings seen, memoized to be reused 126 camera_metadata_t *mSettings; 127 bool mIsInitialized; 128 }; 129 } // namespace usb_camera_hal 130 131 #endif // CAMERA_H_ 132
