00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * Version: RCSL 1.0/RPSL 1.0 00003 * 00004 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 00005 * 00006 * The contents of this file, and the files included with this file, are 00007 * subject to the current version of the RealNetworks Public Source License 00008 * Version 1.0 (the "RPSL") available at 00009 * http://www.helixcommunity.org/content/rpsl unless you have licensed 00010 * the file under the RealNetworks Community Source License Version 1.0 00011 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 00012 * in which case the RCSL will apply. You may also obtain the license terms 00013 * directly from RealNetworks. You may not use this file except in 00014 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 00015 * applicable to this file, the RCSL. Please see the applicable RPSL or 00016 * RCSL for the rights, obligations and limitations governing use of the 00017 * contents of the file. 00018 * 00019 * This file is part of the Helix DNA Technology. RealNetworks is the 00020 * developer of the Original Code and owns the copyrights in the portions 00021 * it created. 00022 * 00023 * This file, and the files included with this file, is distributed and made 00024 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 00025 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 00026 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 00027 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 00028 * 00029 * Technology Compatibility Kit Test Suite(s) Location: 00030 * http://www.helixcommunity.org/content/tck 00031 * 00032 * Contributor(s): 00033 * 00034 * ***** END LICENSE BLOCK ***** */ 00035 00036 /************************************************************************************** 00037 * Fixed-point MP3 decoder 00038 * Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com) 00039 * June 2003 00040 * 00041 * mp3common.h - implementation-independent API's, datatypes, and definitions 00042 **************************************************************************************/ 00043 00044 #ifndef _MP3COMMON_H 00045 #define _MP3COMMON_H 00046 00047 #include <contrib/hxmp3/mp3dec.h> 00048 #include <contrib/hxmp3/statname.h> /* do name-mangling for static linking */ 00049 00050 #define MAX_SCFBD 4 /* max scalefactor bands per channel */ 00051 #define NGRANS_MPEG1 2 00052 #define NGRANS_MPEG2 1 00053 00054 /* 11-bit syncword if MPEG 2.5 extensions are enabled */ 00055 #define SYNCWORDH 0xff 00056 #define SYNCWORDL 0xe0 00057 00058 /* 12-bit syncword if MPEG 1,2 only are supported */ 00059 //#define SYNCWORDH 0xff 00060 //#define SYNCWORDL 0xf0 00061 00062 typedef struct _MP3DecInfo { 00063 /* pointers to platform-specific data structures */ 00064 void *FrameHeaderPS; 00065 void *SideInfoPS; 00066 void *ScaleFactorInfoPS; 00067 void *HuffmanInfoPS; 00068 void *DequantInfoPS; 00069 void *IMDCTInfoPS; 00070 void *SubbandInfoPS; 00071 00072 /* buffer which must be large enough to hold largest possible main_data section */ 00073 unsigned char mainBuf[MAINBUF_SIZE]; 00074 00075 /* special info for "free" bitrate files */ 00076 int freeBitrateFlag; 00077 int freeBitrateSlots; 00078 00079 /* user-accessible info */ 00080 int bitrate; 00081 int nChans; 00082 int samprate; 00083 int nGrans; /* granules per frame */ 00084 int nGranSamps; /* samples per granule */ 00085 int nSlots; 00086 int layer; 00087 MPEGVersion version; 00088 00089 int mainDataBegin; 00090 int mainDataBytes; 00091 00092 int part23Length[MAX_NGRAN][MAX_NCHAN]; 00093 00094 } MP3DecInfo; 00095 00096 typedef struct _SFBandTable { 00097 short l[23]; 00098 short s[14]; 00099 } SFBandTable; 00100 00101 /* decoder functions which must be implemented for each platform */ 00102 MP3DecInfo *AllocateBuffers(void); 00103 void FreeBuffers(MP3DecInfo *mp3DecInfo); 00104 int CheckPadBit(MP3DecInfo *mp3DecInfo); 00105 int UnpackFrameHeader(MP3DecInfo *mp3DecInfo, unsigned char *buf); 00106 int UnpackSideInfo(MP3DecInfo *mp3DecInfo, unsigned char *buf); 00107 int DecodeHuffman(MP3DecInfo *mp3DecInfo, unsigned char *buf, int *bitOffset, int huffBlockBits, int gr, int ch); 00108 int Dequantize(MP3DecInfo *mp3DecInfo, int gr); 00109 int IMDCT(MP3DecInfo *mp3DecInfo, int gr, int ch); 00110 int UnpackScaleFactors(MP3DecInfo *mp3DecInfo, unsigned char *buf, int *bitOffset, int bitsAvail, int gr, int ch); 00111 int Subband(MP3DecInfo *mp3DecInfo, short *pcmBuf); 00112 00113 /* mp3tabs.c - global ROM tables */ 00114 extern const int samplerateTab[3][3]; 00115 extern const short bitrateTab[3][3][15]; 00116 extern const short samplesPerFrameTab[3][3]; 00117 extern const short bitsPerSlotTab[3]; 00118 extern const short sideBytesTab[3][2]; 00119 extern const short slotTab[3][3][15]; 00120 extern const SFBandTable sfBandTable[3][3]; 00121 00122 #endif /* _MP3COMMON_H */