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175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
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/***************************************************************************\
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*
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* MPEG Layer3-Audio Decoder
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* <EFBFBD> 1997-2006 by Fraunhofer IIS
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* All Rights Reserved
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*
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* filename: mpeg.h
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* project : ISO/MPEG-Decoder
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* author : Markus Werner, addings: Martin Sieler
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* date : 1995-07-07
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* contents/description: HEADER - iso/mpeg-definitions
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*
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*
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\***************************************************************************/
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/*
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* $Date: 2011/01/20 22:14:40 $
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* $Id: mpeg.h,v 1.3 2011/01/20 22:14:40 audiodsp Exp $
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*/
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/*-------------------------------------------------------------------------*/
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#ifndef __MPEG_H__
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#define __MPEG_H__
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#include "foundation/align.h"
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/* ------------------------ includes --------------------------------------*/
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/* ------------------------------------------------------------------------*/
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//
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// MPEG ID (fhgVersion)
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//
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#define MPG_MPEG1 1
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#define MPG_MPEG2 0
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#define MPG_MPEG25 2
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/* ------------------------------------------------------------------------*/
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//
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// sample rate
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//
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#define MPG_SF_LOW 2
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/* ------------------------------------------------------------------------*/
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//
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// header-mode field
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//
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#define MPG_MD_STEREO 0
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#define MPG_MD_JOINT_STEREO 1
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#define MPG_MD_DUAL_CHANNEL 2
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#define MPG_MD_MONO 3
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/*-------------------------------------------------------------------------*/
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//
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// channels
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//
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#define MONO 1
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#define STEREO 2
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/* ------------------------------------------------------------------------*/
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//
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// subbands, samples/subband
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//
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#define SBLIMIT 32
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#define SSLIMIT 18
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/* ------------------------------------------------------------------------*/
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//
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// info structure
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//
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typedef struct
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{
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int stereo;
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int sample_rate_ndx;
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int frame_bits;
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int mode;
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int mode_ext;
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int header_size;
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int fhgVersion;
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int protection;
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bool IsMpeg1;
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} MPEG_INFO;
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/* ------------------------------------------------------------------------*/
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//
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// MPEG Layer-3 sideinfo (per channel/granule)
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//
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typedef struct
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{
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int part2_3_length;
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int big_values;
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int global_gain;
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int scalefac_compress;
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int window_switching_flag;
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int block_type;
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int mixed_block_flag;
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int table_select[3];
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int subblock_gain[3];
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int region0_count;
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int region1_count;
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int preflag;
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int scalefac_scale;
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int count1table_select;
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// additional calced values
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int intensity_scale; // MPEG 2, MPEG 2.5 only
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int zeroStartNdx;
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int zeroSfbStartNdxIsLong;
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int zeroSfbStartNdxL;
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int zeroSfbStartNdxSMax;
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int zeroSfbStartNdxS[3];
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int zeroSbStartNdx;
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} MP3SI_GRCH;
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/* ------------------------------------------------------------------------*/
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//
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// MPEG Layer-3 sideinfo
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//
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typedef struct
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{
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int main_data_begin;
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int private_bits;
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struct
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{
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int scfsi[4];
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MP3SI_GRCH gr[2];
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} ch[2];
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} MP3SI;
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/* ------------------------------------------------------------------------*/
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//
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// MPEG Layer-3 scalefactors
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//
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typedef struct
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{
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// scalefactors
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int l[23];
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int s[3][13];
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// illegal intensity position
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int l_iip[23];
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int s_iip[13];
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} MP3SCF;
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/* ------------------------------------------------------------------------*/
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//
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// spectrum (as transmitted)
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//
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typedef NALIGN(16) float SPECTRUM[2][SBLIMIT][SSLIMIT];
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//
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// spectrum (after mdct)
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//
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typedef NALIGN(16) float POLYSPECTRUM[2][SSLIMIT][SBLIMIT];
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/* Nullsoft added 25 Oct 2007 */
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struct DecoderHooks
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{
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void (*layer3_vis)(SPECTRUM vistable,int gr, int nch);
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void (*layer2_eq)(float *xr, int nch, int srate, int nparts);
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void (*layer3_eq)(float *xr, int nch, int srate);
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};
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/* ------------------------------------------------------------------------*/
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#endif
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