/*
 * Copyright (c) 2011 Apple Inc. All rights reserved.
 *
 * @APPLE_APACHE_LICENSE_HEADER_START@
 *
 * 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.
 *
 * @APPLE_APACHE_LICENSE_HEADER_END@
 */

/*
        File:		ALACDecoder.h
*/

#ifndef _ALACDECODER_H
#define _ALACDECODER_H

#if PRAGMA_ONCE
#pragma once
#endif

#include <stdint.h>

#include "ALACAudioTypes.h"

struct BitBuffer;

class ALACDecoder
{
public:
    ALACDecoder();
    ~ALACDecoder();

    int32_t Init(void *inMagicCookie, uint32_t inMagicCookieSize);
    int32_t Decode(struct BitBuffer *bits, uint8_t *sampleBuffer, uint32_t numSamples, uint32_t numChannels, uint32_t *outNumSamples);

public:
    // decoding parameters (public for use in the analyzer)
    ALACSpecificConfig mConfig;

protected:
    int32_t FillElement(struct BitBuffer *bits);
    int32_t DataStreamElement(struct BitBuffer *bits);

    uint16_t mActiveElements;

    // decoding buffers
    int32_t  *mMixBufferU;
    int32_t  *mMixBufferV;
    int32_t  *mPredictor;
    uint16_t *mShiftBuffer; // note: this points to mPredictor's memory but different
                            //		 variable for clarity and type difference
};

#endif /* _ALACDECODER_H */
