/*
 * Copyright (C) 2009 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 META_DATA_H_

#define META_DATA_H_

#include <sys/types.h>

#include <stdint.h>

#include <utils/RefBase.h>
#include <utils/KeyedVector.h>

namespace android {

// The following keys map to int32_t data unless indicated otherwise.
enum {
    kKeyMIMEType          = 'mime',  // cstring
    kKeyWidth             = 'widt',
    kKeyHeight            = 'heig',
    kKeyChannelCount      = '#chn',
    kKeySampleRate        = 'srte',
    kKeyBitRate           = 'brte',  // int32_t (bps)
    kKeyESDS              = 'esds',  // raw data
    kKeyAVCC              = 'avcc',  // raw data
    kKeyVorbisInfo        = 'vinf',  // raw data
    kKeyVorbisBooks       = 'vboo',  // raw data
    kKeyWantsNALFragments = 'NALf',
    kKeyIsSyncFrame       = 'sync',  // int32_t (bool)
    kKeyIsCodecConfig     = 'conf',  // int32_t (bool)
    kKeyTime              = 'time',  // int64_t (usecs)
    kKeyDuration          = 'dura',  // int64_t (usecs)
    kKeyColorFormat       = 'colf',
    kKeyPlatformPrivate   = 'priv',  // pointer
    kKeyDecoderComponent  = 'decC',  // cstring
    kKeyBufferID          = 'bfID',
    kKeyMaxInputSize      = 'inpS',
    kKeyThumbnailTime     = 'thbT',  // int64_t (usecs)

    kKeyAlbum             = 'albu',  // cstring
    kKeyArtist            = 'arti',  // cstring
    kKeyAlbumArtist       = 'aart',  // cstring
    kKeyComposer          = 'comp',  // cstring
    kKeyGenre             = 'genr',  // cstring
    kKeyTitle             = 'titl',  // cstring
    kKeyYear              = 'year',  // cstring
    kKeyAlbumArt          = 'albA',  // compressed image data
    kKeyAlbumArtMIME      = 'alAM',  // cstring
    kKeyAuthor            = 'auth',  // cstring
    kKeyCDTrackNumber     = 'cdtr',  // cstring
    kKeyDiscNumber        = 'dnum',  // cstring
    kKeyDate              = 'date',  // cstring
    kKeyWriter            = 'writ',  // cstring
};

enum {
    kTypeESDS        = 'esds',
    kTypeAVCC        = 'avcc',
};

class MetaData : public RefBase {
public:
    MetaData();
    MetaData(const MetaData &from);

    enum Type {
        TYPE_NONE     = 'none',
        TYPE_C_STRING = 'cstr',
        TYPE_INT32    = 'in32',
        TYPE_INT64    = 'in64',
        TYPE_FLOAT    = 'floa',
        TYPE_POINTER  = 'ptr ',
    };

    void clear();
    bool remove(uint32_t key);

    bool setCString(uint32_t key, const char *value);
    bool setInt32(uint32_t key, int32_t value);
    bool setInt64(uint32_t key, int64_t value);
    bool setFloat(uint32_t key, float value);
    bool setPointer(uint32_t key, void *value);

    bool findCString(uint32_t key, const char **value);
    bool findInt32(uint32_t key, int32_t *value);
    bool findInt64(uint32_t key, int64_t *value);
    bool findFloat(uint32_t key, float *value);
    bool findPointer(uint32_t key, void **value);

    bool setData(uint32_t key, uint32_t type, const void *data, size_t size);

    bool findData(uint32_t key, uint32_t *type,
                  const void **data, size_t *size) const;

protected:
    virtual ~MetaData();

private:
    struct typed_data {
        typed_data();
        ~typed_data();

        typed_data(const MetaData::typed_data &);
        typed_data &operator=(const MetaData::typed_data &);

        void clear();
        void setData(uint32_t type, const void *data, size_t size);
        void getData(uint32_t *type, const void **data, size_t *size) const;

    private:
        uint32_t mType;
        size_t mSize;

        union {
            void *ext_data;
            float reservoir;
        } u;

        bool usesReservoir() const {
            return mSize <= sizeof(u.reservoir);
        }

        void allocateStorage(size_t size);
        void freeStorage();

        void *storage() {
            return usesReservoir() ? &u.reservoir : u.ext_data;
        }

        const void *storage() const {
            return usesReservoir() ? &u.reservoir : u.ext_data;
        }
    };

    KeyedVector<uint32_t, typed_data> mItems;

    // MetaData &operator=(const MetaData &);
};

}  // namespace android

#endif  // META_DATA_H_