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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CAMERA_H_
#define CAMERA_H_
#include <pthread.h>
#include <hardware/camera2.h>
namespace default_camera_hal {
// Camera represents a physical camera on a device.
// This is constructed when the HAL module is loaded, one per physical camera.
// It is opened by the framework, and must be closed before it can be opened
// again.
// Also, the framework can query for camera metadata with getCameraInfo.
// For the first query, the metadata must first be allocated and initialized,
// but once done it is used for all future calls.
// It is protected by @mMutex, and functions that modify the Camera object hold
// this lock when performing modifications. Currently these functions are:
// @open, @close, and @init.
class Camera {
public:
// id is used to distinguish cameras. 0 <= id < NUM_CAMERAS.
// module is a handle to the HAL module, used when the device is opened.
Camera(int id, const hw_module_t* module);
~Camera();
// Open this camera, preparing it for use. Returns nonzero on failure.
int open();
// Close this camera. Returns nonzero on failure.
int close();
// Query for camera metadata, filling info struct. Returns nonzero if
// allocation or initialization failed.
int getCameraInfo(struct camera_info* info);
// Handle to this device passed to framework in response to open().
camera2_device_t mDevice;
private:
// One-time initialization of camera metadata.
void init();
// Identifier used by framework to distinguish cameras
int mId;
// True indicates camera is already open.
bool mBusy;
// Camera characteristics. NULL means it has not been allocated yet.
camera_metadata_t* mMetadata;
// Lock protecting the Camera object for modifications
pthread_mutex_t mMutex;
};
} // namespace default_camera_hal
#endif // CAMERA_H_
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