aaccommon.h

nds上大名鼎鼎的DSOrganize 2.8最新源代码。很值得研究。

/* ***** BEGIN LICENSE BLOCK *****  
 * Source last modified: $Id: aaccommon.h,v 1.1.2.1 2005/02/26 02:05:11 jrecker Exp $ 
 *   
 * Portions Copyright (c) 1995-2005 RealNetworks, Inc. All Rights Reserved.  
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 * the file under the current version of the RealNetworks Community 
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 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL 
 * will apply. You may also obtain the license terms directly from 
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for 
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 *   
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the 
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 * ***** END LICENSE BLOCK ***** */  

/**************************************************************************************
 * Fixed-point HE-AAC decoder
 * Jon Recker ([e-mail])
 * February 2005
 *
 * aaccommon.h - implementation-independent API's, datatypes, and definitions
 **************************************************************************************/

#ifndef _AACCOMMON_H
#define _AACCOMMON_H

#include "aacdec.h"
#include "statname.h"

/* 12-bit syncword */
#define	SYNCWORDH			0xff
#define	SYNCWORDL			0xf0

#define MAX_NCHANS_ELEM		2	/* max number of channels in any single bitstream element (SCE,CPE,CCE,LFE) */

#define ADTS_HEADER_BYTES	7
#define NUM_SAMPLE_RATES	12
#define NUM_DEF_CHAN_MAPS	8
#define NUM_ELEMENTS		8
#define MAX_NUM_PCE_ADIF	16

#define MAX_WIN_GROUPS		8
#define MAX_SFB_SHORT		15
#define MAX_SF_BANDS		(MAX_SFB_SHORT*MAX_WIN_GROUPS)	/* worst case = 15 sfb's * 8 windows for short block */
#define MAX_MS_MASK_BYTES	((MAX_SF_BANDS + 7) >> 3)
#define MAX_PRED_SFB		41
#define MAX_TNS_FILTERS		8
#define MAX_TNS_COEFS		60
#define MAX_TNS_ORDER		20
#define MAX_PULSES			4
#define MAX_GAIN_BANDS		3
#define MAX_GAIN_WIN		8
#define MAX_GAIN_ADJUST		7

#define NSAMPS_LONG			1024
#define NSAMPS_SHORT		128

#define NUM_SYN_ID_BITS		3
#define NUM_INST_TAG_BITS	4

#define EXT_SBR_DATA		0x0d
#define EXT_SBR_DATA_CRC	0x0e

#define IS_ADIF(p)		((p)[0] == 'A' && (p)[1] == 'D' && (p)[2] == 'I' && (p)[3] == 'F')
#define GET_ELE_ID(p)	((AACElementID)(*(p) >> (8-NUM_SYN_ID_BITS)))

/* AAC file format */
enum {
	AAC_FF_Unknown = 0,		/* should be 0 on init */

	AAC_FF_ADTS = 1,
	AAC_FF_ADIF = 2,
	AAC_FF_RAW =  3

};

/* syntactic element type */
enum {
	AAC_ID_INVALID = -1,

	AAC_ID_SCE =  0,
	AAC_ID_CPE =  1,
	AAC_ID_CCE =  2,
	AAC_ID_LFE =  3,
	AAC_ID_DSE =  4,
	AAC_ID_PCE =  5,
	AAC_ID_FIL =  6,
	AAC_ID_END =  7
};

typedef struct _AACDecInfo {
	/* pointers to platform-specific state information */
	void *psInfoBase;	/* baseline MPEG-4 LC decoding */
	void *psInfoSBR;	/* MPEG-4 SBR decoding */
	
	/* raw decoded data, before rounding to 16-bit PCM (for postprocessing such as SBR) */
	void *rawSampleBuf[AAC_MAX_NCHANS];
	int rawSampleBytes;
	int rawSampleFBits;

	/* fill data (can be used for processing SBR or other extensions) */
	unsigned char *fillBuf;
	int fillCount;
	int fillExtType;

	/* block information */
	int prevBlockID;
	int currBlockID;
	int currInstTag;
	int sbDeinterleaveReqd[MAX_NCHANS_ELEM];
	int adtsBlocksLeft;

	/* user-accessible info */
	int bitRate;
	int nChans;
	int sampRate;
	int profile;
	int format;
	int sbrEnabled;
	int tnsUsed;
	int pnsUsed;
	int frameCount;

} AACDecInfo;

/* decoder functions which must be implemented for each platform */
AACDecInfo *AllocateBuffers(void);
void FreeBuffers(AACDecInfo *aacDecInfo);
void ClearBuffer(void *buf, int nBytes);

int UnpackADTSHeader(AACDecInfo *aacDecInfo, unsigned char **buf, int *bitOffset, int *bitsAvail);
int GetADTSChannelMapping(AACDecInfo *aacDecInfo, unsigned char *buf, int bitOffset, int bitsAvail);
int UnpackADIFHeader(AACDecInfo *aacDecInfo, unsigned char **buf, int *bitOffset, int *bitsAvail);
int SetRawBlockParams(AACDecInfo *aacDecInfo, int copyLast, int nChans, int sampRate, int profile);
int PrepareRawBlock(AACDecInfo *aacDecInfo);
int FlushCodec(AACDecInfo *aacDecInfo);

int DecodeNextElement(AACDecInfo *aacDecInfo, unsigned char **buf, int *bitOffset, int *bitsAvail);
int DecodeNoiselessData(AACDecInfo *aacDecInfo, unsigned char **buf, int *bitOffset, int *bitsAvail, int ch);

int Dequantize(AACDecInfo *aacDecInfo, int ch);
int StereoProcess(AACDecInfo *aacDecInfo);
int DeinterleaveShortBlocks(AACDecInfo *aacDecInfo, int ch);
int PNS(AACDecInfo *aacDecInfo, int ch);
int TNSFilter(AACDecInfo *aacDecInfo, int ch);
int IMDCT(AACDecInfo *aacDecInfo, int ch, int chBase, short *outbuf);

/* SBR specific functions */
int InitSBR(AACDecInfo *aacDecInfo);
void FreeSBR(AACDecInfo *aacDecInfo);
int DecodeSBRBitstream(AACDecInfo *aacDecInfo, int chBase);
int DecodeSBRData(AACDecInfo *aacDecInfo, int chBase, short *outbuf);
int FlushCodecSBR(AACDecInfo *aacDecInfo);

/* aactabs.c - global ROM tables */
extern const int sampRateTab[NUM_SAMPLE_RATES];
extern const int predSFBMax[NUM_SAMPLE_RATES];
extern const int channelMapTab[NUM_DEF_CHAN_MAPS];
extern const int elementNumChans[NUM_ELEMENTS];
extern const unsigned char sfBandTotalShort[NUM_SAMPLE_RATES];
extern const unsigned char sfBandTotalLong[NUM_SAMPLE_RATES];
extern const int sfBandTabShortOffset[NUM_SAMPLE_RATES];
extern const short sfBandTabShort[76];
extern const int sfBandTabLongOffset[NUM_SAMPLE_RATES];
extern const short sfBandTabLong[325];
extern const int tnsMaxBandsShortOffset[AAC_NUM_PROFILES];
extern const unsigned char tnsMaxBandsShort[2*NUM_SAMPLE_RATES];
extern const unsigned char tnsMaxOrderShort[AAC_NUM_PROFILES];
extern const int tnsMaxBandsLongOffset[AAC_NUM_PROFILES];
extern const unsigned char tnsMaxBandsLong[2*NUM_SAMPLE_RATES];
extern const unsigned char tnsMaxOrderLong[AAC_NUM_PROFILES];

#endif	/* _AACCOMMON_H */