MultiSource/Applications/ALAC/decode/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 */