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/* ***** BEGIN LICENSE BLOCK *****
* Version: RCSL 1.0/RPSL 1.0
*
* Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
*
* The contents of this file, and the files included with this file, are
* subject to the current version of the RealNetworks Public Source License
* Version 1.0 (the "RPSL") available at
* http://www.helixcommunity.org/content/rpsl unless you have licensed
* the file under the RealNetworks Community Source License Version 1.0
* (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
* in which case the RCSL will apply. You may also obtain the license terms
* directly from RealNetworks. You may not use this file except in
* compliance with the RPSL or, if you have a valid RCSL with RealNetworks
* applicable to this file, the RCSL. Please see the applicable RPSL or
* RCSL for the rights, obligations and limitations governing use of the
* contents of the file.
*
* This file is part of the Helix DNA Technology. RealNetworks is the
* developer of the Original Code and owns the copyrights in the portions
* it created.
*
* This file, and the files included with this file, is distributed and made
* available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
*
* Technology Compatibility Kit Test Suite(s) Location:
* http://www.helixcommunity.org/content/tck
*
* Contributor(s):
*
* ***** END LICENSE BLOCK ***** */
/**************************************************************************************
* Fixed-point MP3 decoder
* Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
* June 2003
*
* mp3common.h - implementation-independent API's, datatypes, and definitions
**************************************************************************************/
#ifndef _MP3COMMON_H
#define _MP3COMMON_H
#include "mp3dec.h"
#include "statname.h" /* do name-mangling for static linking */
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_SCFBD 4 /* max scalefactor bands per channel */
#define NGRANS_MPEG1 2
#define NGRANS_MPEG2 1
/* 11-bit syncword if MPEG 2.5 extensions are enabled */
#define SYNCWORDH 0xff
#define SYNCWORDL 0xe0
/* 12-bit syncword if MPEG 1,2 only are supported
* #define SYNCWORDH 0xff
* #define SYNCWORDL 0xf0
*/
typedef struct _MP3DecInfo {
/* pointers to platform-specific data structures */
void *FrameHeaderPS;
void *SideInfoPS;
void *ScaleFactorInfoPS;
void *HuffmanInfoPS;
void *DequantInfoPS;
void *IMDCTInfoPS;
void *SubbandInfoPS;
/* buffer which must be large enough to hold largest possible main_data section */
unsigned char mainBuf[MAINBUF_SIZE];
/* special info for "free" bitrate files */
int freeBitrateFlag;
int freeBitrateSlots;
/* user-accessible info */
int bitrate;
int nChans;
int samprate;
int nGrans; /* granules per frame */
int nGranSamps; /* samples per granule */
int nSlots;
int layer;
MPEGVersion version;
int mainDataBegin;
int mainDataBytes;
int part23Length[MAX_NGRAN][MAX_NCHAN];
} MP3DecInfo;
typedef struct _SFBandTable {
short l[23];
short s[14];
} SFBandTable;
/* decoder functions which must be implemented for each platform */
MP3DecInfo *AllocateBuffers(void);
void FreeBuffers(MP3DecInfo *mp3DecInfo);
int CheckPadBit(MP3DecInfo *mp3DecInfo);
int UnpackFrameHeader(MP3DecInfo *mp3DecInfo, unsigned char *buf);
int UnpackSideInfo(MP3DecInfo *mp3DecInfo, unsigned char *buf);
int DecodeHuffman(MP3DecInfo *mp3DecInfo, unsigned char *buf, int *bitOffset, int huffBlockBits, int gr, int ch);
int Dequantize(MP3DecInfo *mp3DecInfo, int gr);
int IMDCT(MP3DecInfo *mp3DecInfo, int gr, int ch);
int UnpackScaleFactors(MP3DecInfo *mp3DecInfo, unsigned char *buf, int *bitOffset, int bitsAvail, int gr, int ch);
int Subband(MP3DecInfo *mp3DecInfo, short *pcmBuf);
/* mp3tabs.c - global ROM tables */
extern const int samplerateTab[3][3];
extern const short bitrateTab[3][3][15];
extern const short samplesPerFrameTab[3][3];
extern const short bitsPerSlotTab[3];
extern const short sideBytesTab[3][2];
extern const short slotTab[3][3][15];
extern const SFBandTable sfBandTable[3][3];
#ifdef __cplusplus
}
#endif
#endif /* _MP3COMMON_H */
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