请帮助我理解以下功能行。循环体执行一些浮点运算，但为什么它将浮点指针转换为char *，然后返回？
if ( CG.blockLength >= 4 )
{
nrLevel = (char *)xTime - (char *)scratch;
v8 = &scratch[CG.blockLength];
v9 = xFreq + 1;
v10 = outBuf + 2;
v7 = 0;
do
{
*(v9 - 1) = xTime[v7];
v7 += 4;
v9 += 4;
*v8 = *(v10 - 2);
v8 += 4;
*(v9 - 4) = *(float *)((char *)v9 + nrLevel - 16);
v10 += 4;
*(v8 - 3) = *(float *)((char *)v9 + (char *)outBuf - (char *)xFreq - 16);
*(v9 - 3) = *(float *)((char *)v10 + (char *)xTime - (char *)outBuf - 16);
*(v8 - 2) = *(v10 - 4);
*(v9 - 2) = xTime[v7 - 1];
*(v8 - 1) = *(v10 - 3);
}
while ( v7 < L - 3 );
}
if ( v7 < L )
{
v11 = &xFreq[v7];
v12 = &xFreq[v7 + L];
v13 = L - v7;
do
{
v14 = *(float *)((char *)v11 + (char *)xTime - (char *)xFreq);
++v11;
*(v11 - 1) = v14;
++v12;
--v13;
*(v12 - 1) = *(float *)((char *)v11 + (char *)outBuf - (char *)xFreq - 4);
}
while ( v13 );
}
完整功能在这里供快速参考
int __cdecl NR_Proc(_NoiseReduction *Q, AudioSignal2_ *signal)
{
float *scratch; // ecx@1
float *v3; // edx@1
float *xTime; // ebx@1
int v5; // esi@1
int v7; // edi@5
float *v8; // ecx@6
float *v9; // eax@6
float *v10; // edx@6
float *v11; // eax@9
float *v12; // edx@9
int v13; // ecx@9
double v14; // st7@10
double v15; // st7@14
float *v16; // eax@14
double v17; // st6@14
double v18; // rt0@15
float *v19; // ecx@16
double v20; // rt1@16
double v21; // st6@16
double v22; // st7@16
bool v23; // zf@16
double v24; // st7@18
double v25; // st6@18
double v26; // st5@18
double v27; // st4@18
double v28; // st3@18
int v29; // ecx@19
unsigned int v30; // edx@19
float *v31; // edi@19
double v32; // st2@21
double v33; // st7@21
double v34; // rtt@21
double v35; // st2@21
double v36; // st6@21
double v37; // rt0@23
double v38; // st2@23
double v39; // st4@23
double v40; // st5@23
double v41; // st2@23
double v42; // rt0@23
double v43; // st2@23
double v44; // rt1@23
double v45; // st2@23
double v46; // rtt@23
double v47; // rt0@24
double v48; // st2@24
double v49; // rtt@24
double v50; // rt0@25
double v51; // st2@25
double v52; // st7@25
double v53; // st2@26
double v54; // st6@26
double v55; // rt2@26
double v56; // st2@26
double v57; // st7@26
double v58; // rtt@28
double v59; // rtt@29
double v60; // rt1@30
double v61; // st2@30
double v62; // st6@30
double v63; // st2@31
double v64; // st7@31
double v65; // rtt@31
double v66; // st2@31
double v67; // st6@31
double v68; // rt0@33
double v69; // st2@33
double v70; // st4@33
double v71; // st5@33
double v72; // st2@33
double v73; // rt0@33
double v74; // st2@33
double v75; // rt1@33
double v76; // st2@33
double v77; // rtt@33
double v78; // rt0@34
double v79; // st2@34
double v80; // rtt@34
double v81; // rt0@35
double v82; // st2@35
double v83; // st7@35
double v84; // st2@36
double v85; // st6@36
double v86; // rt2@36
double v87; // st2@36
double v88; // rtt@38
double v89; // rtt@39
double v90; // st1@40
double v91; // rt1@40
double v92; // st2@40
float *v93; // ecx@42
int v94; // edx@42
double v95; // rt2@43
double v96; // st3@43
double v97; // rt0@43
double v98; // st2@45
double v99; // st7@45
double v100; // rt2@45
double v101; // st2@45
double v102; // st6@45
double v103; // rtt@47
double v104; // st2@47
double v105; // st4@47
double v106; // st5@47
double v107; // st2@47
double v108; // rtt@47
double v109; // st2@47
double v110; // rt0@47
double v111; // st2@47
double v112; // rt2@47
double v113; // rtt@48
double v114; // st2@48
double v115; // rt2@48
double v116; // st1@49
double v117; // rtt@49
double v118; // st2@49
double v119; // st7@49
int v120; // edx@51
int v121; // edi@51
int v122; // ecx@52
unsigned int v123; // edx@52
int v124; // eax@52
int v125; // eax@56
int v126; // edx@56
double v127; // st7@57
int v128; // edx@59
double v129; // st7@59
int v130; // edi@60
int v131; // ecx@60
float v132; // ST18_4@61
double v133; // ST30_8@61
double v134; // st1@61
bool v135; // c0@61
bool v136; // c3@61
double v137; // st1@61
float v138; // ST30_4@63
float v139; // ST30_4@63
float v140; // ST18_4@63
double v141; // ST30_8@63
double v142; // st1@63
bool v143; // c0@63
bool v144; // c3@63
double v145; // st1@63
float v146; // ST30_4@65
float v147; // ST30_4@65
float v148; // ST18_4@65
double v149; // ST30_8@65
double v150; // st1@65
bool v151; // c0@65
bool v152; // c3@65
double v153; // st1@65
float v154; // ST30_4@67
float v155; // ST30_4@67
float v156; // ST18_4@67
double v157; // ST30_8@67
double v158; // st1@67
bool v159; // c0@67
bool v160; // c3@67
double v161; // st1@67
float v162; // ST30_4@69
float v163; // ST30_4@69
int v164; // edi@71
int v165; // ecx@71
int v166; // esi@71
float v167; // ST18_4@72
double v168; // ST30_8@72
double v169; // st1@72
bool v170; // c0@72
bool v171; // c3@72
double v172; // st1@72
float v173; // ST4C_4@74
float v174; // ST4C_4@74
int v175; // edx@75
int v176; // esi@75
int v177; // ecx@76
unsigned int v178; // edx@76
int v179; // eax@76
int v180; // eax@80
int v181; // edx@80
double v182; // st7@81
float EXi; // [sp+10h] [bp-3Ch]@21 MAPDST
float y2; // [sp+14h] [bp-38h]@20 MAPDST
double y2j; // [sp+14h] [bp-38h]@61 MAPDST
int L; // [sp+20h] [bp-2Ch]@5
float *outBuf; // [sp+24h] [bp-28h]@3
float *N; // [sp+28h] [bp-24h]@1
int i; // [sp+2Ch] [bp-20h]@18
int nrLevel; // [sp+38h] [bp-14h]@6 MAPDST
float *G; // [sp+3Ch] [bp-10h]@1
float *xFreq; // [sp+40h] [bp-Ch]@1
int bufLength; // [sp+44h] [bp-8h]@1
int v218; // [sp+48h] [bp-4h]@60
scratch = CG.Scratch;
v3 = Q->G;
xTime = Q->xTime;
v5 = CG.ERB_Length;
++Q->count;
xFreq = scratch;
G = v3;
N = Q->N;
bufLength = v5;
if ( !(Q->Enabled & 0x10000000) )
return -5;
outBuf = signal->buffer;
if ( !signal->buffer )
return -1;
v7 = 0;
L = CG.blockLength;
if ( CG.blockLength >= 4 )
{
nrLevel = (char *)xTime - (char *)scratch;
v8 = &scratch[CG.blockLength];
v9 = xFreq + 1;
v10 = outBuf + 2;
v7 = 0;
do
{
*(v9 - 1) = xTime[v7];
v7 += 4;
v9 += 4;
*v8 = *(v10 - 2);
v8 += 4;
*(v9 - 4) = *(float *)((char *)v9 + nrLevel - 16);
v10 += 4;
*(v8 - 3) = *(float *)((char *)v9 + (char *)outBuf - (char *)xFreq - 16);
*(v9 - 3) = *(float *)((char *)v10 + (char *)xTime - (char *)outBuf - 16);
*(v8 - 2) = *(v10 - 4);
*(v9 - 2) = xTime[v7 - 1];
*(v8 - 1) = *(v10 - 3);
}
while ( v7 < L - 3 );
}
if ( v7 < L )
{
v11 = &xFreq[v7];
v12 = &xFreq[v7 + L];
v13 = L - v7;
do
{
v14 = *(float *)((char *)v11 + (char *)xTime - (char *)xFreq);
++v11;
*(v11 - 1) = v14;
++v12;
--v13;
*(v12 - 1) = *(float *)((char *)v11 + (char *)outBuf - (char *)xFreq - 4);
}
while ( v13 );
}
WindowFft(xFreq, L);
AmpSpectrum(xFreq, xTime);
if ( Q->count < 20 && signal->Silence )
{
if ( v5 > 0 )
{
v15 = 1.0;
v16 = N;
v17 = 0.5;
nrLevel = v5;
while ( 1 )
{
v19 = (float *)((char *)v16 + (char *)xTime - (char *)N);
v20 = v17;
v21 = v15;
v22 = v20;
*(float *)((char *)v19 + (char *)G - (char *)xTime) = v21;
++v16;
v23 = nrLevel-- == 1;
*(v16 - 1) = *v19 * v20 + *(v16 - 1) * v20;
if ( v23 )
break;
v18 = v21;
v17 = v22;
v15 = v18;
}
}
}
else
{
v24 = 0.94999999;
v25 = 0.050000001;
i = 0;
v26 = 0.99800003;
v27 = 0.0020000001;
v28 = 0.99980003;
if ( v5 >= 4 )
{
v29 = (int)(N + 1);
v30 = ((unsigned int)(v5 - 4) >> 2) + 1;
v31 = xTime + 3;
i = 4 * v30;
do
{
y2 = *(v31 - 3);
if ( *(float *)(v29 - 4) <= (double)y2 )
{
if ( Q->count >= 2000 )
{
v47 = y2;
EXi = 0.99980003;
y2 = 0.00019999999;
v48 = v24;
v33 = v47;
v49 = v48;
v35 = v25;
v36 = v49;
}
else
{
v37 = y2;
EXi = v26;
v38 = v27;
v39 = v26;
y2 = v38;
v40 = v38;
v41 = v24;
v33 = v37;
v42 = v41;
v43 = v25;
v36 = v42;
v44 = v43;
v45 = v40;
v26 = v39;
v46 = v45;
v35 = v44;
v27 = v46;
}
}
else
{
v32 = v24;
v33 = y2;
EXi = v32;
v34 = v32;
v35 = v25;
v36 = v34;
y2 = v35;
}
v50 = v35;
v51 = v33 * y2 + *(float *)(v29 - 4) * EXi;
v52 = v50;
*(float *)(v29 - 4) = v51;
y2 = *(float *)(v29 + (char *)xTime - (char *)N);
if ( *(float *)v29 <= (double)y2 )
{
if ( Q->count >= 2000 )
{
v59 = y2;
EXi = 0.99980003;
y2 = 0.00019999999;
v56 = v52;
v57 = v36;
v54 = v59;
}
else
{
v58 = y2;
EXi = v26;
y2 = v27;
v56 = v52;
v57 = v36;
v54 = v58;
}
}
else
{
v53 = v36;
v54 = y2;
EXi = v53;
v55 = v53;
v56 = v52;
v57 = v55;
y2 = v56;
}
v60 = v56;
v61 = v54 * y2 + *(float *)v29 * EXi;
v62 = v60;
*(float *)v29 = v61;
y2 = *(v31 - 1);
if ( *(float *)(v29 + 4) <= (double)y2 )
{
if ( Q->count >= 2000 )
{
v78 = y2;
EXi = 0.99980003;
y2 = 0.00019999999;
v79 = v57;
v64 = v78;
v80 = v79;
v66 = v62;
v67 = v80;
}
else
{
v68 = y2;
EXi = v26;
v69 = v27;
v70 = v26;
y2 = v69;
v71 = v69;
v72 = v57;
v64 = v68;
v73 = v72;
v74 = v62;
v67 = v73;
v75 = v74;
v76 = v71;
v26 = v70;
v77 = v76;
v66 = v75;
v27 = v77;
}
}
else
{
v63 = v57;
v64 = y2;
EXi = v63;
v65 = v63;
v66 = v62;
v67 = v65;
y2 = v66;
}
v81 = v66;
v82 = v64 * y2 + EXi * *(float *)(v29 + 4);
v83 = v81;
*(float *)(v29 + 4) = v82;
y2 = *v31;
if ( *(float *)(v29 + 8) <= (double)y2 )
{
if ( Q->count >= 2000 )
{
v89 = y2;
EXi = 0.99980003;
y2 = 0.00019999999;
v87 = v83;
v24 = v67;
v85 = v89;
}
else
{
v88 = y2;
EXi = v26;
y2 = v27;
v87 = v83;
v24 = v67;
v85 = v88;
}
}
else
{
v84 = v67;
v85 = y2;
EXi = v84;
v86 = v84;
v87 = v83;
v24 = v86;
y2 = v87;
}
v90 = *(float *)(v29 + 8);
v29 += 16;
v31 += 4;
--v30;
v91 = v87;
v92 = v85 * y2 + v90 * EXi;
v25 = v91;
*(float *)(v29 - 8) = v92;
}
while ( v30 );
}
if ( i < v5 )
{
v93 = &N[i];
v94 = v5 - i;
while ( 1 )
{
y2 = *(float *)((char *)v93 + (char *)xTime - (char *)N);
if ( *v93 <= (double)y2 )
{
if ( Q->count >= 2000 )
{
v113 = y2;
EXi = v28;
y2 = 0.00019999999;
v114 = v24;
v99 = v113;
v115 = v114;
v101 = v25;
v102 = v115;
}
else
{
v103 = y2;
EXi = v26;
v104 = v27;
v105 = v26;
y2 = v104;
v106 = v104;
v107 = v24;
v99 = v103;
v108 = v107;
v109 = v25;
v102 = v108;
v110 = v109;
v111 = v106;
v26 = v105;
v112 = v111;
v101 = v110;
v27 = v112;
}
}
else
{
v98 = v24;
v99 = y2;
EXi = v98;
v100 = v98;
v101 = v25;
v102 = v100;
y2 = v101;
}
v116 = *v93;
++v93;
--v94;
v117 = v101;
v118 = v99 * y2 + v116 * EXi;
v119 = v117;
*(v93 - 1) = v118;
if ( !v94 )
break;
v95 = v28;
v96 = v119;
v24 = v102;
v97 = v96;
v28 = v95;
v25 = v97;
}
}
}
if ( Q->Enabled & 0x2000000 )
{
v128 = 0;
v129 = CG.dbTable[Q->nrLeveldB];
if ( v5 >= 4 )
{
v130 = (int)(N + 2);
v218 = (char *)N - (char *)G;
v131 = (int)(G + 1);
nrLevel = (char *)xTime - (char *)N;
do
{
EXi = xTime[v128];
v132 = *(float *)(v130 - 8) * 8.0;
v133 = EXi - v132;
v134 = EXi * v129;
y2j = v134;
v135 = v133 < v134;
v136 = v133 == v134;
v137 = v133;
if ( v135 || v136 )
v137 = y2j;
v138 = v137;
v139 = v138 / (EXi + 1.0 + 2.0);
*(float *)(v131 - 4) = v139 * 0.300000011920929 + *(float *)(v131 - 4) * 0.699999988079071;
EXi = *(float *)(nrLevel + v131 + v218);
v140 = *(float *)(v131 + v218) * 8.0;
v141 = EXi - v140;
v142 = EXi * v129;
y2j = v142;
v143 = v141 < v142;
v144 = v141 == v142;
v145 = v141;
if ( v143 || v144 )
v145 = y2j;
v146 = v145;
v147 = v146 / (EXi + 1.0 + 2.0);
*(float *)v131 = v147 * 0.300000011920929 + *(float *)v131 * 0.699999988079071;
EXi = *(float *)(v130 + nrLevel);
v148 = *(float *)v130 * 8.0;
v149 = EXi - v148;
v150 = EXi * v129;
y2j = v150;
v151 = v149 < v150;
v152 = v149 == v150;
v153 = v149;
if ( v151 || v152 )
v153 = y2j;
v154 = v153;
v155 = v154 / (EXi + 1.0 + 2.0);
*(float *)(v131 + 4) = v155 * 0.300000011920929 + *(float *)(v131 + 4) * 0.699999988079071;
EXi = xTime[v128 + 3];
v156 = *(float *)(v130 + 4) * 8.0;
v157 = EXi - v156;
v158 = EXi * v129;
y2j = v158;
v159 = v157 < v158;
v160 = v157 == v158;
v161 = v157;
if ( v159 || v160 )
v161 = y2j;
v162 = v161;
v5 = bufLength;
v128 += 4;
v131 += 16;
v130 += 16;
v163 = v162 / (EXi + 1.0 + 2.0);
*(float *)(v131 - 8) = v163 * 0.300000011920929 + *(float *)(v131 - 8) * 0.699999988079071;
}
while ( v128 < bufLength - 3 );
}
if ( v128 < v5 )
{
v164 = (char *)N - (char *)G;
v165 = (int)&G[v128];
v166 = v5 - v128;
do
{
EXi = *(float *)(v165 + v164 + (char *)xTime - (char *)N);
v167 = *(float *)(v165 + v164) * 8.0;
v168 = EXi - v167;
v169 = EXi * v129;
y2j = v169;
v170 = v168 < v169;
v171 = v168 == v169;
v172 = v168;
if ( v170 || v171 )
v172 = y2j;
v173 = v172;
v165 += 4;
--v166;
v174 = v173 / (EXi + 1.0 + 2.0);
*(float *)(v165 - 4) = v174 * 0.300000011920929 + *(float *)(v165 - 4) * 0.699999988079071;
}
while ( v166 );
}
FreqSmooth(G, xFreq, 0.5);
v175 = L;
v176 = 0;
if ( L >= 4 )
{
v177 = (int)(outBuf + 3);
v178 = ((unsigned int)(L - 4) >> 2) + 1;
v179 = (int)(xTime + 1);
v176 = 4 * v178;
do
{
v179 += 16;
*(float *)(v179 - 20) = *(float *)(v177 - 12);
v177 += 16;
--v178;
*(float *)(v179 - 16) = *(float *)(v179 + (char *)outBuf - (char *)xTime - 16);
*(float *)(v179 - 12) = *(float *)(v177 - 20);
*(float *)(v179 - 8) = *(float *)(v177 - 16);
}
while ( v178 );
v175 = L;
}
if ( v176 < v175 )
{
v180 = (int)&xTime[v176];
v181 = v175 - v176;
do
{
v182 = *(float *)((char *)outBuf - (char *)xTime + v180);
v180 += 4;
--v181;
*(float *)(v180 - 4) = v182;
}
while ( v181 );
}
Reconstruct(xFreq, outBuf, Q->by);
return 0;
}
v120 = L;
v121 = 0;
if ( L >= 4 )
{
v122 = (int)(outBuf + 3);
v123 = ((unsigned int)(L - 4) >> 2) + 1;
v124 = (int)(xTime + 1);
v121 = 4 * v123;
do
{
v124 += 16;
*(float *)(v124 - 20) = *(float *)(v122 - 12);
v122 += 16;
--v123;
*(float *)(v124 - 16) = *(float *)((char *)outBuf - (char *)xTime + v124 - 16);
*(float *)(v124 - 12) = *(float *)(v122 - 20);
*(float *)(v124 - 8) = *(float *)(v122 - 16);
}
while ( v123 );
v120 = L;
}
if ( v121 >= v120 )
return 0;
v125 = (int)&xTime[v121];
v126 = v120 - v121;
do
{
v127 = *(float *)(v125 + (char *)outBuf - (char *)xTime);
v125 += 4;
--v126;
*(float *)(v125 - 4) = v127;
}
while ( v126 );
return 0;
}