/*
* 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 ANDROID_CLIENT_CAMERA2_CAMERAMETADATA_CPP
#define ANDROID_CLIENT_CAMERA2_CAMERAMETADATA_CPP
#include "system/camera_metadata.h"
#include <utils/String8.h>
#include <utils/Vector.h>
namespace android {
class Parcel;
/**
* A convenience wrapper around the C-based camera_metadata_t library.
*/
class CameraMetadata {
public:
/** Creates an empty object; best used when expecting to acquire contents
* from elsewhere */
CameraMetadata();
/** Creates an object with space for entryCapacity entries, with
* dataCapacity extra storage */
CameraMetadata(size_t entryCapacity, size_t dataCapacity = 10);
~CameraMetadata();
/** Takes ownership of passed-in buffer */
CameraMetadata(camera_metadata_t *buffer);
/** Clones the metadata */
CameraMetadata(const CameraMetadata &other);
/**
* Assignment clones metadata buffer.
*/
CameraMetadata &operator=(const CameraMetadata &other);
CameraMetadata &operator=(const camera_metadata_t *buffer);
/**
* Get reference to the underlying metadata buffer. Ownership remains with
* the CameraMetadata object, but non-const CameraMetadata methods will not
* work until unlock() is called. Note that the lock has nothing to do with
* thread-safety, it simply prevents the camera_metadata_t pointer returned
* here from being accidentally invalidated by CameraMetadata operations.
*/
const camera_metadata_t* getAndLock() const;
/**
* Unlock the CameraMetadata for use again. After this unlock, the pointer
* given from getAndLock() may no longer be used. The pointer passed out
* from getAndLock must be provided to guarantee that the right object is
* being unlocked.
*/
status_t unlock(const camera_metadata_t *buffer);
/**
* Release a raw metadata buffer to the caller. After this call,
* CameraMetadata no longer references the buffer, and the caller takes
* responsibility for freeing the raw metadata buffer (using
* free_camera_metadata()), or for handing it to another CameraMetadata
* instance.
*/
camera_metadata_t* release();
/**
* Clear the metadata buffer and free all storage used by it
*/
void clear();
/**
* Acquire a raw metadata buffer from the caller. After this call,
* the caller no longer owns the raw buffer, and must not free or manipulate it.
* If CameraMetadata already contains metadata, it is freed.
*/
void acquire(camera_metadata_t* buffer);
/**
* Acquires raw buffer from other CameraMetadata object. After the call, the argument
* object no longer has any metadata.
*/
void acquire(CameraMetadata &other);
/**
* Append metadata from another CameraMetadata object.
*/
status_t append(const CameraMetadata &other);
/**
* Append metadata from a raw camera_metadata buffer
*/
status_t append(const camera_metadata* other);
/**
* Number of metadata entries.
*/
size_t entryCount() const;
/**
* Is the buffer empty (no entires)
*/
bool isEmpty() const;
/**
* Sort metadata buffer for faster find
*/
status_t sort();
/**
* Update metadata entry. Will create entry if it doesn't exist already, and
* will reallocate the buffer if insufficient space exists. Overloaded for
* the various types of valid data.
*/
status_t update(uint32_t tag,
const uint8_t *data, size_t data_count);
status_t update(uint32_t tag,
const int32_t *data, size_t data_count);
status_t update(uint32_t tag,
const float *data, size_t data_count);
status_t update(uint32_t tag,
const int64_t *data, size_t data_count);
status_t update(uint32_t tag,
const double *data, size_t data_count);
status_t update(uint32_t tag,
const camera_metadata_rational_t *data, size_t data_count);
status_t update(uint32_t tag,
const String8 &string);
template<typename T>
status_t update(uint32_t tag, Vector<T> data) {
return update(tag, data.array(), data.size());
}
/**
* Check if a metadata entry exists for a given tag id
*
*/
bool exists(uint32_t tag) const;
/**
* Get metadata entry by tag id
*/
camera_metadata_entry find(uint32_t tag);
/**
* Get metadata entry by tag id, with no editing
*/
camera_metadata_ro_entry find(uint32_t tag) const;
/**
* Delete metadata entry by tag
*/
status_t erase(uint32_t tag);
/**
* Swap the underlying camera metadata between this and the other
* metadata object.
*/
void swap(CameraMetadata &other);
/**
* Dump contents into FD for debugging. The verbosity levels are
* 0: Tag entry information only, no data values
* 1: Level 0 plus at most 16 data values per entry
* 2: All information
*
* The indentation parameter sets the number of spaces to add to the start
* each line of output.
*/
void dump(int fd, int verbosity = 1, int indentation = 0) const;
/**
* Serialization over Binder
*/
// Metadata object is unchanged when reading from parcel fails.
status_t readFromParcel(Parcel *parcel);
status_t writeToParcel(Parcel *parcel) const;
/**
* Caller becomes the owner of the new metadata
* 'const Parcel' doesnt prevent us from calling the read functions.
* which is interesting since it changes the internal state
*
* NULL can be returned when no metadata was sent, OR if there was an issue
* unpacking the serialized data (i.e. bad parcel or invalid structure).
*/
static status_t readFromParcel(const Parcel &parcel,
camera_metadata_t** out);
/**
* Caller retains ownership of metadata
* - Write 2 (int32 + blob) args in the current position
*/
static status_t writeToParcel(Parcel &parcel,
const camera_metadata_t* metadata);
private:
camera_metadata_t *mBuffer;
mutable bool mLocked;
/**
* Check if tag has a given type
*/
status_t checkType(uint32_t tag, uint8_t expectedType);
/**
* Base update entry method
*/
status_t updateImpl(uint32_t tag, const void *data, size_t data_count);
/**
* Resize metadata buffer if needed by reallocating it and copying it over.
*/
status_t resizeIfNeeded(size_t extraEntries, size_t extraData);
};
}; // namespace android
#endif