实现声音的-算法描述

最新推荐文章于 2023-06-18 10:56:36 发布

原创最新推荐文章于 2023-06-18 10:56:36 发布 · 726 阅读

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#算法 #file #buffer #null #include

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#include "stdafx.h"
#include "mmsystem.h"
#include "makewave.h"

int makewave(CString filename, short * buffer, DWORD size)
{
char fname[300];
strcpy(fname,filename);
HMMIO file1;
file1 = mmioOpen(fname,NULL,MMIO_CREATE | MMIO_WRITE);
long i;
char title0[5]="RIFF";
i=mmioWrite(file1,title0,4);
DWORD j;
j = 4*4+sizeof(PCMWAVEFORMAT)+size*2;
i=mmioWrite(file1,(char*)&j,4);
char title1[5]="WAVE";
i=mmioWrite(file1,title1,4);
char title2[5]="fmt ";
i=mmioWrite(file1,title2,4);
j=sizeof(PCMWAVEFORMAT);
i=mmioWrite(file1,(char *)&j,4);
PCMWAVEFORMAT vf;
vf.wf.wFormatTag=WAVE_FORMAT_PCM;
vf.wf.nChannels=1;
vf.wf.nSamplesPerSec = 44100;
vf.wf.nAvgBytesPerSec = 44100*2;
vf.wf.nBlockAlign = 2;
vf.wBitsPerSample = 16;
i=mmioWrite(file1,(char*)&vf,sizeof(PCMWAVEFORMAT));
char title3[5]="data";
i=mmioWrite(file1, title3, 4);
j=size*2;
i=mmioWrite(file1,(char *)&j, 4);
i=mmioWrite(file1,(char *)buffer,size*2);
i=mmioClose(file1,0);
return 0;
}

int readwave(CString filename, short * buffer, DWORD maxsize)
{
char fname[300];
strcpy(fname,filename);
HMMIO file1;
file1 = mmioOpen(fname,NULL,MMIO_READ);
if(file1==NULL) throw "faie to open file";
long i;
char title0[5]="RIFF";
i=mmioRead(file1,title0,4);
DWORD j;
j = 4*4+sizeof(PCMWAVEFORMAT)+maxsize;
i=mmioRead(file1,(char*)&j,4);
char title1[5]="WAVE";
i=mmioRead(file1,title1,4);
char title2[5]="fmt ";
i=mmioRead(file1,title2,4);
j=sizeof(PCMWAVEFORMAT);
i=mmioRead(file1,(char *)&j,4);
PCMWAVEFORMAT vf;
vf.wf.wFormatTag=WAVE_FORMAT_PCM;
vf.wf.nChannels=1;
vf.wf.nSamplesPerSec = 44100;
vf.wf.nAvgBytesPerSec = 44100*2;
vf.wf.nBlockAlign = 2;
vf.wBitsPerSample = 16;
i=mmioRead(file1,(char*)&vf,sizeof(PCMWAVEFORMAT));
char title3[5]="data";
i=mmioRead(file1, title3, 4);
j=maxsize;
i=mmioRead(file1,(char *)&j, 4);
i=mmioRead(file1,(char *)buffer,maxsize*2);
mmioClose(file1,0);
return i/2;
}