/* MPEG/WAVE Sound library (C) 1997 by Jung woo-jae */ // Filter.cc // Subbandsynthesis routines from maplay 1.2 for Linux // I've modified some macros for reducing source code. #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "MPEGaudio.h" void MPEGaudio::computebuffer_2(REAL *fraction,REAL buffer[2][CALCBUFFERSIZE]) { REAL p0,p1,p2,p3,p4,p5,p6,p7,p8,p9,pa,pb,pc,pd,pe,pf; REAL q0,q1,q2,q3,q4,q5,q6,q7,q8,q9,qa,qb,qc,qd,qe,qf; REAL *out1,*out2; out1=buffer[currentcalcbuffer]+calcbufferoffset; out2=buffer[currentcalcbuffer^1]+calcbufferoffset; #define OUT1(v,t) out1[(32-(v))*16] =(-(out1[(v)*16]=t)) #define OUT2(v) out2[(96-(v)-32)*16]=out2[((v)-32)*16] // compute new values via a fast cosine transform: /* { register REAL *x=fraction; p0=x[ 0]+x[31];p1=x[ 1]+x[30];p2=x[ 2]+x[29];p3=x[ 3]+x[28]; p4=x[ 4]+x[27];p5=x[ 5]+x[26];p6=x[ 6]+x[25];p7=x[ 7]+x[24]; p8=x[ 8]+x[23];p9=x[ 9]+x[22];pa=x[10]+x[21];pb=x[11]+x[20]; pc=x[12]+x[19];pd=x[13]+x[18];pe=x[14]+x[17];pf=x[15]+x[16]; } q0=p0+pf;q1=p1+pe;q2=p2+pd;q3=p3+pc; q4=p4+pb;q5=p5+pa;q6=p6+p9;q7=p7+p8; q8=hcos_32[0]*(p0-pf);q9=hcos_32[1]*(p1-pe); qa=hcos_32[2]*(p2-pd);qb=hcos_32[3]*(p3-pc); qc=hcos_32[4]*(p4-pb);qd=hcos_32[5]*(p5-pa); qe=hcos_32[6]*(p6-p9);qf=hcos_32[7]*(p7-p8); */ { register REAL *x=fraction; q0=x[ 0]+x[15];q1=x[ 1]+x[14];q2=x[ 2]+x[13];q3=x[ 3]+x[12]; q4=x[ 4]+x[11];q5=x[ 5]+x[10];q6=x[ 6]+x[ 9];q7=x[ 7]+x[ 8]; q8=hcos_32[0]*(x[ 0]-x[15]);q9=hcos_32[1]*(x[ 1]-x[14]); qa=hcos_32[2]*(x[ 2]-x[13]);qb=hcos_32[3]*(x[ 3]-x[12]); qc=hcos_32[4]*(x[ 4]-x[11]);qd=hcos_32[5]*(x[ 5]-x[10]); qe=hcos_32[6]*(x[ 6]-x[ 9]);qf=hcos_32[7]*(x[ 7]-x[ 8]); } p0=q0+q7;p1=q1+q6;p2=q2+q5;p3=q3+q4; p4=hcos_16[0]*(q0-q7);p5=hcos_16[1]*(q1-q6); p6=hcos_16[2]*(q2-q5);p7=hcos_16[3]*(q3-q4); p8=q8+qf;p9=q9+qe;pa=qa+qd;pb=qb+qc; pc=hcos_16[0]*(q8-qf);pd=hcos_16[1]*(q9-qe); pe=hcos_16[2]*(qa-qd);pf=hcos_16[3]*(qb-qc); q0=p0+p3;q1=p1+p2;q2=hcos_8[0]*(p0-p3);q3=hcos_8[1]*(p1-p2); q4=p4+p7;q5=p5+p6;q6=hcos_8[0]*(p4-p7);q7=hcos_8[1]*(p5-p6); q8=p8+pb;q9=p9+pa;qa=hcos_8[0]*(p8-pb);qb=hcos_8[1]*(p9-pa); qc=pc+pf;qd=pd+pe;qe=hcos_8[0]*(pc-pf);qf=hcos_8[1]*(pd-pe); p0=q0+q1;p1=hcos_4*(q0-q1);p2=q2+q3;p3=hcos_4*(q2-q3); p4=q4+q5;p5=hcos_4*(q4-q5);p6=q6+q7;p7=hcos_4*(q6-q7); p8=q8+q9;p9=hcos_4*(q8-q9);pa=qa+qb;pb=hcos_4*(qa-qb); pc=qc+qd;pd=hcos_4*(qc-qd);pe=qe+qf;pf=hcos_4*(qe-qf); { register REAL tmp; tmp=p6+p7; OUT2(36)=-(p5+tmp); OUT2(44)=-(p4+tmp); tmp=pb+pf; OUT1(10,tmp); OUT1(6,pd+tmp); tmp=pe+pf; OUT2(46)=-(p8+pc+tmp); OUT2(34)=-(p9+pd+tmp); tmp+=pa+pb; OUT2(38)=-(pd+tmp); OUT2(42)=-(pc+tmp); OUT1(2,p9+pd+pf); OUT1(4,p5+p7); OUT2(48)=-p0; out2[0]=-(out1[0]=p1); OUT1( 8,p3); OUT1(12,p7); OUT1(14,pf); OUT2(40)=-(p2+p3); } { register REAL *x=fraction; /* p0=hcos_64[ 0]*(x[ 0]-x[31]);p1=hcos_64[ 1]*(x[ 1]-x[30]); p2=hcos_64[ 2]*(x[ 2]-x[29]);p3=hcos_64[ 3]*(x[ 3]-x[28]); p4=hcos_64[ 4]*(x[ 4]-x[27]);p5=hcos_64[ 5]*(x[ 5]-x[26]); p6=hcos_64[ 6]*(x[ 6]-x[25]);p7=hcos_64[ 7]*(x[ 7]-x[24]); p8=hcos_64[ 8]*(x[ 8]-x[23]);p9=hcos_64[ 9]*(x[ 9]-x[22]); pa=hcos_64[10]*(x[10]-x[21]);pb=hcos_64[11]*(x[11]-x[20]); pc=hcos_64[12]*(x[12]-x[19]);pd=hcos_64[13]*(x[13]-x[18]); pe=hcos_64[14]*(x[14]-x[17]);pf=hcos_64[15]*(x[15]-x[16]); */ p0=hcos_64[ 0]*x[ 0];p1=hcos_64[ 1]*x[ 1]; p2=hcos_64[ 2]*x[ 2];p3=hcos_64[ 3]*x[ 3]; p4=hcos_64[ 4]*x[ 4];p5=hcos_64[ 5]*x[ 5]; p6=hcos_64[ 6]*x[ 6];p7=hcos_64[ 7]*x[ 7]; p8=hcos_64[ 8]*x[ 8];p9=hcos_64[ 9]*x[ 9]; pa=hcos_64[10]*x[10];pb=hcos_64[11]*x[11]; pc=hcos_64[12]*x[12];pd=hcos_64[13]*x[13]; pe=hcos_64[14]*x[14];pf=hcos_64[15]*x[15]; } q0=p0+pf;q1=p1+pe;q2=p2+pd;q3=p3+pc; q4=p4+pb;q5=p5+pa;q6=p6+p9;q7=p7+p8; q8=hcos_32[0]*(p0-pf);q9=hcos_32[1]*(p1-pe); qa=hcos_32[2]*(p2-pd);qb=hcos_32[3]*(p3-pc); qc=hcos_32[4]*(p4-pb);qd=hcos_32[5]*(p5-pa); qe=hcos_32[6]*(p6-p9);qf=hcos_32[7]*(p7-p8); p0=q0+q7;p1=q1+q6;p2=q2+q5;p3=q3+q4; p4=hcos_16[0]*(q0-q7);p5=hcos_16[1]*(q1-q6); p6=hcos_16[2]*(q2-q5);p7=hcos_16[3]*(q3-q4); p8=q8+qf;p9=q9+qe;pa=qa+qd;pb=qb+qc; pc=hcos_16[0]*(q8-qf);pd=hcos_16[1]*(q9-qe); pe=hcos_16[2]*(qa-qd);pf=hcos_16[3]*(qb-qc); q0=p0+p3;q1=p1+p2;q2=hcos_8[0]*(p0-p3);q3=hcos_8[1]*(p1-p2); q4=p4+p7;q5=p5+p6;q6=hcos_8[0]*(p4-p7);q7=hcos_8[1]*(p5-p6); q8=p8+pb;q9=p9+pa;qa=hcos_8[0]*(p8-pb);qb=hcos_8[1]*(p9-pa); qc=pc+pf;qd=pd+pe;qe=hcos_8[0]*(pc-pf);qf=hcos_8[1]*(pd-pe); p0=q0+q1;p1=hcos_4*(q0-q1); p2=q2+q3;p3=hcos_4*(q2-q3); p4=q4+q5;p5=hcos_4*(q4-q5); p6=q6+q7;p7=hcos_4*(q6-q7); p8=q8+q9;p9=hcos_4*(q8-q9); pa=qa+qb;pb=hcos_4*(qa-qb); pc=qc+qd;pd=hcos_4*(qc-qd); pe=qe+qf;pf=hcos_4*(qe-qf); { REAL tmp; tmp=pd+pf; OUT1(5,p5+p7+pb+tmp); tmp+=p9; OUT1(1,p1+tmp); OUT2(33)=-(p1+pe+tmp); tmp+=p5+p7; OUT1(3,tmp); OUT2(35)=-(p6+pe+tmp); tmp=pa+pb+pc+pd+pe+pf; OUT2(39)=-(p2+p3+tmp-pc); OUT2(43)=-(p4+p6+p7+tmp-pd); OUT2(37)=-(p5+p6+p7+tmp-pc); OUT2(41)=-(p2+p3+tmp-pd); tmp=p8+pc+pe+pf; OUT2(47)=-(p0+tmp); OUT2(45)=-(p4+p6+p7+tmp); tmp=pb+pf; OUT1(11,p7+tmp); tmp+=p3; OUT1( 9,tmp); OUT1( 7,pd+tmp); OUT1(13,p7+pf); OUT1(15,pf); } } #define SAVE \ raw=(int)(r*scalefactor); \ if(raw>MAXSCALE)raw=MAXSCALE;else if(rawMAXSCALE)raw=MAXSCALE;else if(rawMAXSCALE)raw=MAXSCALE;else if(raw