wav文件的读取

最新推荐文章于 2024-08-13 16:42:11 发布

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#wav #文件读取 #c语言

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该博客介绍了如何使用C语言读取wav文件，特别是针对双声道的情况。内容提到，即使文件可能是单声道，也可以根据头文件参数进行判断。每个声道的数据由两个字节组成，因此左声道的总数据量等于数据大小（以字节为单位）除以4。

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wav文件的读取，默认为双声道（若为单声道根据头文件中的参数做个判断即可），一个声道的一组数据为两个字节，所以左声道总数据数为dataSize（字节为单位）/4

#include <stdlib.h>
#include <stdio.h>
#include<malloc.h>
#include <math.h>

struct RIFF_HEADER
{
    //RIFF_HEADER
    unsigned   char     szRiffID[4];           //   'R','I','F','F'
    unsigned   long     dwRiffSize;
    unsigned   char     szRiffFormat[4];     //   'W','A','V','E'
    //   WAVE_FORMAT
}riff_header;

struct FMT_BLOCK
{
    //   FMT_BLOCK
    unsigned   char     szFmtID[4];           //   'f','m','t','   '
    unsigned   long     dwFmtSize;
    // dwFmtSize为16则其后16字节，否则为18，末尾有2个字节的附加信息

    unsigned   short   wFormatTag;
    unsigned   short   wChannels;
    unsigned   long     dwSamplesPerSec;
    unsigned   long     dwAvgBytesPerSec;
    unsigned   short   wBlockAlign;
    unsigned   short   wBitsPerSample;

    //  unsigned   short   ultraMessage;
}fmt_block;

struct FACT_BLOCK
{
    unsigned   char     szFactID[4];   //   'f','a','c','t'
    unsigned   long     dwFactSize;
}fact_block;

struct DATA_BLOCK
{
    //   DATA_BLOCK
    unsigned   char   szDataID[4];   //   'd','a','t','a'
    unsigned   long   dwDataSize;
}data_block;


int main()
{
    // int i;   //用作循环计数
    //unsigned char ch[ch_size];  //用来存储wav文件的头信息
    FILE *fp;
    const char* wav_path= "d:\\wavcs\\cat.wav";

    fp=fopen(wav_path,"rb");//为读，打开一个wav文件

    if((fp=fopen(wav_path,"rb"))==NULL) //若打开文件失败，退出
    {
        printf("can't open this file\n");
        exit(0);
    }

    fread(&riff_header,sizeof(struct RIFF_HEADER),1,fp);
    printf("riff_header\n");
    printf("%10s%10x%10s",riff_header.szRiffID,riff_header.dwRiffSize,riff_header.szRiffFormat);
    printf("\n");

    fread(&fmt_block,sizeof(struct FMT_BLOCK),1,fp);
    printf("fmt_block\n");
    printf("%10s%10x%10x%10x\n%10x%10x%10x%10x",fmt_block.szFmtID,fmt_block.dwFmtSize,fmt_block.wFormatTag,fmt_block.wChannels,fmt_block.dwSamplesPerSec,fmt_block.dwAvgBytesPerSec,fmt_block.wBlockAlign,fmt_block.wBitsPerSample);
    printf("\n");

    fread(&data_block,sizeof(struct DATA_BLOCK),1,fp);
    printf("data_block\n");
    printf("%10s%10x",data_block.szDataID,data_block.dwDataSize);
    printf("\n");


    int data_size=data_block.dwDataSize/2;
    printf("datasize%d\n",data_size);

    short *datacontent=(short *)malloc(sizeof(short)*data_size);
    fread(&datacontent,sizeof(short),data_size,fp);

    printf("datacontent\n");
    // 读取数据
    //    int m;//全数据输出的测试
    //    for(m=354303;m<354304;m++)
    //    {
    //    printf("datacount%d\n",m);
    //    float databyfloat=datacontent[m]/32768.0000;
    //    printf("%0.4f\n",databyfloat);
    //    };


    int i=0;//取出右声道部分
    int n=0;

    int single_size=data_block.dwDataSize/4;
    printf("singletracksize%d\n",single_size);

    float *singletrackdata = (float *)malloc(single_size*sizeof(float));


    for(;i <data_size;i++) {//取出左声道部分数据放入数组singletrackdata
        if(i%2 == 0) {
            singletrackdata[n] = datacontent[i]/32768.0000;
            //printf("singletrackdata%d\n",n+1);
            //printf("%0.4f\n",singletrackdata[n]);
            n++;
        }
    }

    //    int m;//单声道数据输出的测试
    //    for(m=354301;m<354304;m++)
    //    {
    //    printf("datacount%d\n",m);
    //    float databyfloat=singletrackdata[m];
    //    printf("%0.4f\n",databyfloat);
    //    };