audiowrap.h

本程序为ST公司开发的源代码

/**************************************************
 *
 * mp3wrap.h
 *
 * CVS ID:   $Id: audiowrap.h,v 1.4 2006/09/18 09:55:21 belardi Exp $
 * Author:   Raffaele Belardi [RB] - STM
 * Date:     $Date: 2006/09/18 09:55:21 $
 * Revision: $Revision: 1.4 $
 * 
 * Description:
 * 
 * Wrapper functions around the ARM MP3 library functions.
 * 
 ***************************************************
 * 
 * COPYRIGHT (C) ST Microelectronics  2005
 *            All Rights Reserved
 *
 ****************************************************
 *
 * STM CVS Log:
 *
 * $Log: audiowrap.h,v $
 * Revision 1.4  2006/09/18 09:55:21  belardi
 * Corrected CVS keyword usage
 *
 * Revision 1.3  2006/09/18 09:23:01  belardi
 * Added Log CVS keyword into file header
 *
 *
 ***************************************************/
#ifndef _AUDIOWRAP_H_
#define _AUDIOWRAP_H_



#include "decoder_task.h"


typedef enum AudioDecoderState_tag {
	notInitializedAudioDec,
	waitingFrameDataAudioDec,
	decodingBlocksAudioDec,
	waitingAudioBufferHeaderAudioDec,
	waitingAudioBufferAudioDec,
	waitingAudioBufferEOFAudioDec,
	fatalErrorAudioDec
} AudioDecoderStateType;

// Used by MPeDecode() to check if the SRC was already initialized



typedef enum AudioUpdateStatus_tag {
	dataReadyAudioDec,
	waitingForDataAudioDec,
	immediateEOFAudioDec,
	dataErrorAudioDec,
	dataEOFAudioDec
} AudioUpdateStatus;


typedef struct tagAudioDecoderBitstream
{
/* output/updated */
    /* the next data offset requested by the decoder from the address
       in the bitstream referenced by 'data'; all 'dataOffset' bytes in
       memory from 'data' can be discarded. This value may be set negative
       by the decoder only if the BitstreamSeekBytes or BitstreamSeekTime
       functions are called with the first parameter (offset) being negative.
       At all other times, this value will be positive
        */
    int                 dataOffset ;
    
    /* the next number of bytes required by the decoder to make some 
       progress; this is guaranteed to be less than or equal to the value of
       'inputSize' returned in the decoder requirements */
    unsigned int        dataRequired ;

/* input */
    /* pointer to the next bitstream bytes */
    unsigned char                *data ;
    
    /* the number of input bytes presented to the decoder. */
    unsigned int        dataLength ;
    
} sAudioDecoderBitstream ;


typedef struct
{
  uint8 flags_4n;
  uint8 flags_4np1;
  uint8 flags_4np2;
  uint8 flags_4np3;
} C2_FLAGS_STRUCT;

typedef union
{
  C2_FLAGS_STRUCT field;
  uint32 all;
} C2_FLAGS_UNION;




//#define outputBufferSamplesNumber 1152
//#define sizeOfSampleInBytes 2

// Function prototypes
void AudioInit(void);
decoderReturnType AudioDecode(int flag);
void AudioKill(DecoderKillType);

#endif //_MP3WRAP_H_