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-rw-r--r--mpeglib/lib/splay/synth_Down.cpp231
1 files changed, 231 insertions, 0 deletions
diff --git a/mpeglib/lib/splay/synth_Down.cpp b/mpeglib/lib/splay/synth_Down.cpp
new file mode 100644
index 00000000..fbe3887b
--- /dev/null
+++ b/mpeglib/lib/splay/synth_Down.cpp
@@ -0,0 +1,231 @@
+/*
+ downsample implementation
+ Copyright (C) 2001 Martin Vogt
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Library General Public License as published by
+ the Free Software Foundation.
+
+ For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#include "synthesis.h"
+#include "dct64_down.cpp"
+
+#include <iostream>
+
+using namespace std;
+
+
+void Synthesis::computebuffer_Down(REAL *fraction,
+ REAL buffer[2][CALCBUFFERSIZE]){
+ REAL *out1,*out2;
+
+ out1=buffer[currentcalcbuffer]+calcbufferoffset;
+ out2=buffer[currentcalcbuffer^1]+calcbufferoffset;
+ dct64_downsample(out1,out2,fraction);
+}
+
+
+
+#define SAVE putraw(r); \
+ dp+=16;vp+=15+(15-14)
+#define OS r=*vp * *dp++
+#define XX vp+=15;r+=*vp * *dp++
+#define OP r+=*--vp * *dp++
+
+inline void Synthesis::generatesingle_Down(void)
+{
+ int i;
+ register REAL r, *vp;
+ register const REAL *dp;
+
+ i=32/2;
+ dp=filter;
+ vp=calcbuffer[LS][currentcalcbuffer]+calcbufferoffset;
+// actual_v+actual_write_pos;
+
+ switch (calcbufferoffset)
+ {
+ case 0:for(;i;i--,vp+=15){
+ OS;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 1:for(;i;i--,vp+=15){
+ OS;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 2:for(;i;i--,vp+=15){
+ OS;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 3:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 4:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 5:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 6:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 7:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 8:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 9:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 10:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;
+ SAVE;}break;
+ case 11:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;
+ SAVE;}break;
+ case 12:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;
+ SAVE;}break;
+ case 13:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;
+ SAVE;}break;
+ case 14:for(;i;i--,vp+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;
+ SAVE;}break;
+ case 15:for(;i;i--,vp+=31){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ }
+}
+
+#undef OS
+#undef XX
+#undef OP
+#undef SAVE
+
+#define SAVE \
+ putraw(r1); \
+ putraw(r2); \
+ dp+=16;vp1+=15+(15-14);vp2+=15+(15-14)
+#define OS r1=*vp1 * *dp; \
+ r2=*vp2 * *dp++
+#define XX vp1+=15;r1+=*vp1 * *dp; \
+ vp2+=15;r2+=*vp2 * *dp++
+#define OP r1+=*--vp1 * *dp; \
+ r2+=*--vp2 * *dp++
+
+
+inline void Synthesis::generate_Down(void)
+{
+ int i;
+ REAL r1,r2;
+ register REAL *vp1,*vp2;
+ register const REAL *dp;
+
+ dp=filter;
+ vp1=calcbuffer[LS][currentcalcbuffer]+calcbufferoffset;
+ vp2=calcbuffer[RS][currentcalcbuffer]+calcbufferoffset;
+// actual_v+actual_write_pos;
+
+ i=32/2;
+ switch (calcbufferoffset)
+ {
+ case 0:for(;i;i--,vp1+=15,vp2+=15){
+ OS;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 1:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 2:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 3:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 4:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 5:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 6:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 7:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 8:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 9:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ case 10:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;OP;
+ SAVE;}break;
+ case 11:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;OP;
+ SAVE;}break;
+ case 12:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;OP;
+ SAVE;}break;
+ case 13:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;OP;
+ SAVE;}break;
+ case 14:for(;i;i--,vp1+=15,vp2+=15){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;XX;
+ SAVE;}break;
+ case 15:for(;i;i--,vp1+=31,vp2+=31){
+ OS;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;OP;
+ SAVE;}break;
+ }
+}
+
+
+
+void Synthesis::synth_Down(int lOutputStereo,REAL *fractionL,REAL *fractionR) {
+ switch(lOutputStereo) {
+ case true:
+ computebuffer_Down(fractionL,calcbuffer[LS]);
+ computebuffer_Down(fractionR,calcbuffer[RS]);
+ generate_Down();
+ nextOffset();
+ break;
+ case false:
+ computebuffer_Down(fractionL,calcbuffer[LS]);
+ generatesingle_Down();
+ nextOffset();
+ break;
+ default:
+ cout << "unknown lOutputStereo in Synthesis::synth_Std"<<endl;
+ exit(0);
+ }
+}
+
+
+void Synthesis::synthMP3_Down(int lOutputStereo,
+ REAL hout [2][SSLIMIT][SBLIMIT]) {
+ int ss;
+ switch(lOutputStereo) {
+ case true:
+ for(ss=0;ss<SSLIMIT;ss++) {
+ computebuffer_Down(hout[LS][ss],calcbuffer[LS]);
+ computebuffer_Down(hout[RS][ss],calcbuffer[RS]);
+ generate_Down();
+ nextOffset();
+ }
+ break;
+ case false:
+ for(ss=0;ss<SSLIMIT;ss++) {
+ computebuffer_Down(hout[LS][ss],calcbuffer[LS]);
+ generatesingle_Down();
+ nextOffset();
+ }
+ break;
+ default:
+ cout << "unknown lOutputStereo in Synthesis::synth_Std"<<endl;
+ exit(0);
+ }
+}
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