ALACDecoder.h

/*
 * 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 */