1 /* 2 * Copyright (C) 2012 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 "Metadata.h" 24 #include "Stream.h" 25 26 namespace default_camera_hal { 27 // Camera represents a physical camera on a device. 28 // This is constructed when the HAL module is loaded, one per physical camera. 29 // It is opened by the framework, and must be closed before it can be opened 30 // again. 31 // This is an abstract class, containing all logic and data shared between all 32 // camera devices (front, back, etc) and common to the ISP. 33 class Camera { 34 public: 35 // id is used to distinguish cameras. 0 <= id < NUM_CAMERAS. 36 // module is a handle to the HAL module, used when the device is opened. 37 explicit Camera(int id); 38 virtual ~Camera(); 39 40 // Common Camera Device Operations (see <hardware/camera_common.h>) 41 int open(const hw_module_t *module, hw_device_t **device); 42 int getInfo(struct camera_info *info); 43 int close(); 44 45 // Camera v3 Device Operations (see <hardware/camera3.h>) 46 int initialize(const camera3_callback_ops_t *callback_ops); 47 int configureStreams(camera3_stream_configuration_t *stream_list); 48 int registerStreamBuffers(const camera3_stream_buffer_set_t *buf_set); 49 const camera_metadata_t *constructDefaultRequestSettings(int type); 50 int processCaptureRequest(camera3_capture_request_t *request); 51 void dump(int fd); 52 53 54 protected: 55 // Initialize static camera characteristics for individual device 56 virtual camera_metadata_t *initStaticInfo() = 0; 57 // Verify settings are valid for a capture 58 virtual bool isValidCaptureSettings(const camera_metadata_t *) = 0; 59 // Separate initialization method for individual devices when opened 60 virtual int initDevice() = 0; 61 // Accessor used by initDevice() to set the templates' metadata 62 int setTemplate(int type, camera_metadata_t *static_info); 63 // Prettyprint template names 64 const char* templateToString(int type); 65 66 private: 67 // Camera device handle returned to framework for use 68 camera3_device_t mDevice; 69 // Reuse a stream already created by this device 70 Stream *reuseStream(camera3_stream_t *astream); 71 // Destroy all streams in a stream array, and the array itself 72 void destroyStreams(Stream **array, int count); 73 // Verify a set of streams is valid in aggregate 74 bool isValidStreamSet(Stream **array, int count); 75 // Calculate usage and max_bufs of each stream 76 void setupStreams(Stream **array, int count); 77 // Copy new settings for re-use and clean up old settings. 78 void setSettings(const camera_metadata_t *new_settings); 79 // Verify settings are valid for reprocessing an input buffer 80 bool isValidReprocessSettings(const camera_metadata_t *settings); 81 // Process an output buffer 82 int processCaptureBuffer(const camera3_stream_buffer_t *in, 83 camera3_stream_buffer_t *out); 84 // Send a shutter notify message with start of exposure time 85 void notifyShutter(uint32_t frame_number, uint64_t timestamp); 86 // Is type a valid template type (and valid index into mTemplates) 87 bool isValidTemplateType(int type); 88 89 // Identifier used by framework to distinguish cameras 90 const int mId; 91 // Metadata containing persistent camera characteristics 92 Metadata mMetadata; 93 // camera_metadata structure containing static characteristics 94 camera_metadata_t *mStaticInfo; 95 // Busy flag indicates camera is in use 96 bool mBusy; 97 // Camera device operations handle shared by all devices 98 const static camera3_device_ops_t sOps; 99 // Methods used to call back into the framework 100 const camera3_callback_ops_t *mCallbackOps; 101 // Lock protecting the Camera object for modifications 102 android::Mutex mDeviceLock; 103 // Lock protecting only static camera characteristics, which may 104 // be accessed without the camera device open 105 android::Mutex mStaticInfoLock; 106 // Array of handles to streams currently in use by the device 107 Stream **mStreams; 108 // Number of streams in mStreams 109 int mNumStreams; 110 // Static array of standard camera settings templates 111 camera_metadata_t *mTemplates[CAMERA3_TEMPLATE_COUNT]; 112 // Most recent request settings seen, memoized to be reused 113 camera_metadata_t *mSettings; 114 }; 115 } // namespace default_camera_hal 116 117 #endif // CAMERA_H_ 118
