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 <pthread.h> 21 #include <hardware/hardware.h> 22 #include <hardware/camera3.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 class Camera { 32 public: 33 // id is used to distinguish cameras. 0 <= id < NUM_CAMERAS. 34 // module is a handle to the HAL module, used when the device is opened. 35 Camera(int id); 36 ~Camera(); 37 38 // Common Camera Device Operations (see <hardware/camera_common.h>) 39 int open(const hw_module_t *module, hw_device_t **device); 40 int getInfo(struct camera_info *info); 41 int close(); 42 43 // Camera v3 Device Operations (see <hardware/camera3.h>) 44 int initialize(const camera3_callback_ops_t *callback_ops); 45 int configureStreams(camera3_stream_configuration_t *stream_list); 46 int registerStreamBuffers(const camera3_stream_buffer_set_t *buf_set); 47 const camera_metadata_t *constructDefaultRequestSettings(int type); 48 int processCaptureRequest(camera3_capture_request_t *request); 49 void getMetadataVendorTagOps(vendor_tag_query_ops_t *ops); 50 void dump(int fd); 51 52 // Camera device handle returned to framework for use 53 camera3_device_t mDevice; 54 55 private: 56 // Separate initialization method for static metadata 57 camera_metadata_t *initStaticInfo(); 58 // Reuse a stream already created by this device 59 Stream *reuseStream(camera3_stream_t *astream); 60 // Destroy all streams in a stream array, and the array itself 61 void destroyStreams(Stream **array, int count); 62 // Verify a set of streams is valid in aggregate 63 bool isValidStreamSet(Stream **array, int count); 64 // Calculate usage and max_bufs of each stream 65 void setupStreams(Stream **array, int count); 66 // Copy new settings for re-use and clean up old settings. 67 void setSettings(const camera_metadata_t *new_settings); 68 // Verify settings are valid for a capture 69 bool isValidCaptureSettings(const camera_metadata_t *settings); 70 // Verify settings are valid for reprocessing an input buffer 71 bool isValidReprocessSettings(const camera_metadata_t *settings); 72 // Process an output buffer 73 int processCaptureBuffer(const camera3_stream_buffer_t *in, 74 camera3_stream_buffer_t *out); 75 // Send a shutter notify message with start of exposure time 76 void notifyShutter(uint32_t frame_number, uint64_t timestamp); 77 78 // Identifier used by framework to distinguish cameras 79 const int mId; 80 // Metadata containing persistent camera characteristics 81 Metadata mMetadata; 82 // camera_metadata structure containing static characteristics 83 camera_metadata_t *mStaticInfo; 84 // Busy flag indicates camera is in use 85 bool mBusy; 86 // Camera device operations handle shared by all devices 87 const static camera3_device_ops_t sOps; 88 // Methods used to call back into the framework 89 const camera3_callback_ops_t *mCallbackOps; 90 // Lock protecting the Camera object for modifications 91 pthread_mutex_t mMutex; 92 // Lock protecting only static camera characteristics, which may 93 // be accessed without the camera device open 94 pthread_mutex_t mStaticInfoMutex; 95 // Array of handles to streams currently in use by the device 96 Stream **mStreams; 97 // Number of streams in mStreams 98 int mNumStreams; 99 // Static array of standard camera settings templates 100 Metadata *mTemplates[CAMERA3_TEMPLATE_COUNT]; 101 // Most recent request settings seen, memoized to be reused 102 camera_metadata_t *mSettings; 103 }; 104 } // namespace default_camera_hal 105 106 #endif // CAMERA_H_ 107
