diff options
Diffstat (limited to 'mpeglib/lib/splay/mpegsound.h')
| -rw-r--r-- | mpeglib/lib/splay/mpegsound.h | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/mpeglib/lib/splay/mpegsound.h b/mpeglib/lib/splay/mpegsound.h new file mode 100644 index 00000000..cd0c3571 --- /dev/null +++ b/mpeglib/lib/splay/mpegsound.h @@ -0,0 +1,248 @@ +// MPEG/WAVE Sound library + +// (C) 1997 by Woo-jae Jung + +// Mpegsound.h +// This is typeset for functions in MPEG/WAVE Sound library. +// Now, it's for only linux-pc-?86 + +/************************************/ +/* Include default library packages */ +/************************************/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + + + +#include "mpegAudioStream.h" +#include "common.h" + +class Synthesis; +class AudioFrame; + + +#ifndef _L__SOUND__ +#define _L__SOUND__ + +#include "mpegAudioHeader.h" +#include "mpegAudioBitWindow.h" + + +//#define DEBUG_LAYER(x) x +#define DEBUG_LAYER(x) + + +/**************************/ +/* Define values for MPEG */ +/**************************/ +#define SCALEBLOCK 12 +#define MAXSUBBAND 32 +#define MAXCHANNEL 2 +#define RAWDATASIZE (2*2*2*32*SSLIMIT) + + + +// Huffmancode +#define HTN 34 + + + +#define MODE_MONO 0 +#define MODE_STEREO 1 + +/********************/ +/* Type definitions */ +/********************/ + +typedef struct { + bool generalflag; + unsigned int part2_3_length; + unsigned int big_values; + unsigned int global_gain; + unsigned int scalefac_compress; + unsigned int window_switching_flag; + unsigned int block_type; + unsigned int mixed_block_flag; + unsigned int table_select[3]; + unsigned int subblock_gain[3]; + unsigned int region0_count; + unsigned int region1_count; + unsigned int preflag; + unsigned int scalefac_scale; + unsigned int count1table_select; +}layer3grinfo; + +typedef struct { + unsigned main_data_begin; + unsigned private_bits; + struct { + unsigned scfsi[4]; + layer3grinfo gr[2]; + }ch[2]; +}layer3sideinfo; + +typedef struct { + int l[23]; /* [cb] */ + int s[3][13]; /* [window][cb] */ +}layer3scalefactor; /* [ch] */ + +typedef struct { + int tablename; + unsigned int xlen,ylen; + unsigned int linbits; + unsigned int treelen; + const unsigned int (*val)[2]; +}HUFFMANCODETABLE; + + + + + + + +class DCT; +class Dump; + +// Class for converting mpeg format to raw format +class Mpegtoraw { + /*****************************/ + /* Constant tables for layer */ + /*****************************/ +private: + static const int bitrate[2][3][15]; + static const int frequencies[2][3]; + static const REAL scalefactorstable[64]; + static const ATTR_ALIGN(64) HUFFMANCODETABLE ht[HTN]; + + + friend class HuffmanLookup; + + /*************************/ + /* MPEG header variables */ + /*************************/ + + // comes from constructor, decoder works on them + MpegAudioStream* mpegAudioStream; + MpegAudioHeader* mpegAudioHeader; + AudioFrame* audioFrame; + Dump* dump; + Synthesis* synthesis; + + /***************************************/ + /* Interface for setting music quality */ + /***************************************/ + + int lWantStereo; + int lOutputStereo; + int lDownSample; + +public: + Mpegtoraw(MpegAudioStream* mpegAudioStream, + MpegAudioHeader* mpegAudioHeader); + + + ~Mpegtoraw(); + int decode(AudioFrame* audioFrame); + + + void setStereo(int lStereo); + int getStereo(); + + void setDownSample(int lDownSample); + int getDownSample(); + + + +private: + void initialize(); + + + + /*****************************/ + /* Loading MPEG-Audio stream */ + /*****************************/ + + union + { + unsigned char store[4]; + unsigned int current; + }u; + + + int getbyte() { return mpegAudioStream->getbyte(); } + int getbits(int bits) { return mpegAudioStream->getbits(bits); } + int getbits9(int bits) { return mpegAudioStream->getbits9(bits); } + int getbits8() { return mpegAudioStream->getbits8(); } + int getbit() { return mpegAudioStream->getbit(); } + + + void sync() { mpegAudioStream->sync(); } + bool issync() { return mpegAudioStream->issync(); } + + + /********************/ + /* Global variables */ + /********************/ + + // optimisation from maplay12+ + // 0/1: nonzero for channel 0/1 2: max position for both + int nonzero[3]; + + // for Layer3 + + int layer3framestart; + int layer3part2start; + + ATTR_ALIGN(64) REAL prevblck[2][2][SBLIMIT][SSLIMIT]; + int currentprevblock; + ATTR_ALIGN(64) layer3sideinfo sideinfo; + ATTR_ALIGN(64) layer3scalefactor scalefactors[2]; + + ATTR_ALIGN(64) MpegAudioBitWindow bitwindow; + MpegAudioBitWindow lastValidBitwindow; + + int wgetbit(void); + int wgetbits9(int bits); + int wgetbits(int bits); + int wgetCanReadBits(); + + /*************************************/ + /* Decoding functions for each layer */ + /*************************************/ + + // Extractor + void extractlayer1(void); // MPEG-1 + void extractlayer2(void); + void extractlayer3(void); + void extractlayer3_2(void); // MPEG-2 + + + // Functions for layer 3 + void layer3initialize(void); + bool layer3getsideinfo(void); + bool layer3getsideinfo_2(void); + void layer3getscalefactors(int ch,int gr); + void layer3getscalefactors_2(int ch); + void layer3huffmandecode(int ch,int gr,int out[SBLIMIT][SSLIMIT]); + REAL layer3twopow2(int scale,int preflag,int pretab_offset,int l); + REAL layer3twopow2_1(int a,int b,int c); + void layer3dequantizesample(int ch,int gr,int in[SBLIMIT][SSLIMIT], + REAL out[SBLIMIT][SSLIMIT]); + void adjustNonZero(REAL in[2][SBLIMIT][SSLIMIT]); + void layer3fixtostereo(int gr,REAL in[2][SBLIMIT][SSLIMIT]); + void layer3reorderandantialias(int ch,int gr,REAL in[SBLIMIT][SSLIMIT], + REAL out[SBLIMIT][SSLIMIT]); + + void layer3hybrid(int ch,int gr,REAL in[SBLIMIT][SSLIMIT], + REAL out[SSLIMIT][SBLIMIT]); + + void huffmandecoder_1(const HUFFMANCODETABLE *h,int *x,int *y); + void huffmandecoder_2(const HUFFMANCODETABLE *h,int *x,int *y,int *v,int *w); + +}; + + + +#endif |