本文主要是介绍音频混音算法的实现,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
最近项目有用到混音算法,这里用比较常见的一种,就是简单的加和之后做一下归一化。
是参考这个博主实现的:
音频混音的算法实现
下面直接贴代码:
#include <stdio.h>
#include <stdlib.h>
#include <math.h> #define IN_FILE1 "mic.wav"
#define IN_FILE2 "spk.wav"
#define OUT_FILE "remix.pcm" #define SIZE_AUDIO_FRAME (2) void Mix(char sourseFile[10][SIZE_AUDIO_FRAME],int number,char *objectFile)
{ //归一化混音 int const MAX=32767; int const MIN=-32768; double f=1; int output; int i = 0,j = 0; for (i=0;i<SIZE_AUDIO_FRAME/2;i++) { int temp=0; for (j=0;j<number;j++) { temp+=*(short*)(sourseFile[j]+i*2); } output=(int)(temp*f); if (output>MAX) { f=(double)MAX/(double)(output); output=MAX; } if (output<MIN) { f=(double)MIN/(double)(output); output=MIN; } if (f<1) { f+=((double)1-f)/(double)32; } *(short*)(objectFile+i*2)=(short)output; }
} int main()
{ FILE * fp1,*fp2,*fpm; fp1 = fopen(IN_FILE1,"rb"); fp2 = fopen(IN_FILE2,"rb"); fpm = fopen(OUT_FILE,"wb"); short data1,data2,date_mix; int ret1,ret2; char sourseFile[10][2]; while(1) { ret1 = fread(&data1,2,1,fp1); ret2 = fread(&data2,2,1,fp2); *(short*) sourseFile[0] = data1; *(short*) sourseFile[1] = data2; if(ret1>0 && ret2>0) { Mix(sourseFile,2,(char *)&date_mix); if(date_mix > pow(2,16-1) || date_mix < -pow(2,16-1)) printf("mix error\n"); } else if( (ret1 > 0) && (ret2==0)) { date_mix = data1; } else if( (ret2 > 0) && (ret1==0)) { date_mix = data2; } else if( (ret1 == 0) && (ret2 == 0)) { break; } fwrite(&date_mix,2,1,fpm); } fclose(fp1); fclose(fp2); fclose(fpm); printf("Done!\n");
}
关键函数在Mix
函数里面实现,实现上来看就是加在一起,然后做一个归一化处理,就是为了防止达到上限设置了一下归一化。
测试上可以用两个dtmf的声音来测试,结果如下
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