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