| /* |
| * 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 |