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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 <hardware/hardware.h>
#include <hardware/camera3.h>
#include <utils/Mutex.h>
#include "Metadata.h"
#include "Stream.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.
// This is an abstract class, containing all logic and data shared between all
// camera devices (front, back, etc) and common to the ISP.
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);
virtual ~Camera();
// Common Camera Device Operations (see <hardware/camera_common.h>)
int open(const hw_module_t *module, hw_device_t **device);
int getInfo(struct camera_info *info);
int close();
// Camera v3 Device Operations (see <hardware/camera3.h>)
int initialize(const camera3_callback_ops_t *callback_ops);
int configureStreams(camera3_stream_configuration_t *stream_list);
int registerStreamBuffers(const camera3_stream_buffer_set_t *buf_set);
const camera_metadata_t *constructDefaultRequestSettings(int type);
int processCaptureRequest(camera3_capture_request_t *request);
void dump(int fd);
protected:
// Initialize static camera characteristics for individual device
virtual camera_metadata_t *initStaticInfo() = 0;
// Verify settings are valid for a capture
virtual bool isValidCaptureSettings(const camera_metadata_t *) = 0;
// Separate initialization method for individual devices when opened
virtual int initDevice() = 0;
// Accessor used by initDevice() to set the templates' metadata
int setTemplate(int type, camera_metadata_t *static_info);
// Prettyprint template names
const char* templateToString(int type);
private:
// Camera device handle returned to framework for use
camera3_device_t mDevice;
// Reuse a stream already created by this device
Stream *reuseStream(camera3_stream_t *astream);
// Destroy all streams in a stream array, and the array itself
void destroyStreams(Stream **array, int count);
// Verify a set of streams is valid in aggregate
bool isValidStreamSet(Stream **array, int count);
// Calculate usage and max_bufs of each stream
void setupStreams(Stream **array, int count);
// Copy new settings for re-use and clean up old settings.
void setSettings(const camera_metadata_t *new_settings);
// Verify settings are valid for reprocessing an input buffer
bool isValidReprocessSettings(const camera_metadata_t *settings);
// Process an output buffer
int processCaptureBuffer(const camera3_stream_buffer_t *in,
camera3_stream_buffer_t *out);
// Send a shutter notify message with start of exposure time
void notifyShutter(uint32_t frame_number, uint64_t timestamp);
// Is type a valid template type (and valid index into mTemplates)
bool isValidTemplateType(int type);
// Identifier used by framework to distinguish cameras
const int mId;
// Metadata containing persistent camera characteristics
Metadata mMetadata;
// camera_metadata structure containing static characteristics
camera_metadata_t *mStaticInfo;
// Busy flag indicates camera is in use
bool mBusy;
// Camera device operations handle shared by all devices
const static camera3_device_ops_t sOps;
// Methods used to call back into the framework
const camera3_callback_ops_t *mCallbackOps;
// Lock protecting the Camera object for modifications
android::Mutex mDeviceLock;
// Lock protecting only static camera characteristics, which may
// be accessed without the camera device open
android::Mutex mStaticInfoLock;
// Array of handles to streams currently in use by the device
Stream **mStreams;
// Number of streams in mStreams
int mNumStreams;
// Static array of standard camera settings templates
camera_metadata_t *mTemplates[CAMERA3_TEMPLATE_COUNT];
// Most recent request settings seen, memoized to be reused
camera_metadata_t *mSettings;
};
} // namespace default_camera_hal
#endif // CAMERA_H_
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