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C++读取WAV音频文件的头部数据的实现方法

2017-10-30 11:31 796 查看

C++读取WAV音频文件的头部数据的实现方法

前言：

在这里分享一下自己的心得，希望和大家一起分享技术，如果有什么不足，还请大家指正。写出这篇目的，就是希望大家一起成长，我也相信技术之间没有高低，只有互补，只有分享，才能使彼此更加成长。

实现代码：

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
using std::string;
using std::fstream;
typedef struct WAV_HEADER{
char        RIFF[4];    // RIFF Header   Magic header
unsigned long    ChunkSize;   // RIFF Chunk Size
char        WAVE[4];    // WAVE Header
char        fmt[4];     // FMT header
unsigned long    Subchunk1Size; // Size of the fmt chunk
unsigned short   AudioFormat;  // Audio format 1=PCM,6=mulaw,7=alaw, 257=IBM Mu-Law, 258=IBM A-Law, 259=ADPCM
unsigned short   NumOfChan;   // Number of channels 1=Mono 2=Sterio
unsigned long    SamplesPerSec; // Sampling Frequency in Hz
unsigned long    bytesPerSec;  // bytes per second
unsigned short   blockAlign;   // 2=16-bit mono, 4=16-bit stereo
unsigned short   bitsPerSample; // Number of bits per sample
char        Subchunk2ID[4]; // "data" string
unsigned long    Subchunk2Size; // Sampled data length
}wav_hdr;
// Function prototypes
int getFileSize(FILE *inFile);
int main(int argc,char *argv[]){
wav_hdr wavHeader;
FILE *wavFile;
int headerSize = sizeof(wav_hdr),filelength = 0;
string answer;
do{
string input;
string answer;
const char* filePath;
cout << "Pick wav file from the Windows Media File: ";
cin >> input;
cin.get();
cout << endl;
path = "C:\\Windows\\Media\\" + input + ".wav";
filePath = path.c_str();
wavFile = fopen( filePath , "r" );
if(wavFile == NULL){
printf("Can not able to open wave file\n");
//exit(EXIT_FAILURE);
}
fread(&wavHeader,headerSize,1,wavFile);
filelength = getFileSize(wavFile);
fclose(wavFile);
cout << "File is          :" << filelength << " bytes." << endl;
cout << "RIFF header        :" << wavHeader.RIFF[0]
<< wavHeader.RIFF[1]
<< wavHeader.RIFF[2]
<< wavHeader.RIFF[3] << endl;
cout << "WAVE header        :" << wavHeader.WAVE[0]
<< wavHeader.WAVE[1]
<< wavHeader.WAVE[2]
<< wavHeader.WAVE[3]
<< endl;
cout << "FMT            :" << wavHeader.fmt[0]
<< wavHeader.fmt[1]
<< wavHeader.fmt[2]
<< wavHeader.fmt[3]
<< endl;
cout << "Data size         :" << wavHeader.ChunkSize << endl;
// Display the sampling Rate form the header
cout << "Sampling Rate       :" << wavHeader.SamplesPerSec << endl;
cout << "Number of bits used    :" << wavHeader.bitsPerSample << endl;
cout << "Number of channels     :" << wavHeader.NumOfChan << endl;
cout << "Number of bytes per second :" << wavHeader.bytesPerSec << endl;
cout << "Data length        :" << wavHeader.Subchunk2Size << endl;
cout << "Audio Format        :" << wavHeader.AudioFormat << endl;
// Audio format 1=PCM,6=mulaw,7=alaw, 257=IBM Mu-Law, 258=IBM A-Law, 259=ADPCM
cout << "Block align        :" << wavHeader.blockAlign << endl;
cout << "Data string        :" << wavHeader.Subchunk2ID[0]
<< wavHeader.Subchunk2ID[1]
<< wavHeader.Subchunk2ID[2]
<< wavHeader.Subchunk2ID[3]
<< endl;
cout << endl << endl << "Try something else? (y/n)";
cin >> answer;
//cin.get();
cout << endl << endl;
}while( answer == "y" );
getchar();
return 0;
}
// find the file size
int getFileSize(FILE *inFile){
int fileSize = 0;
fseek(inFile,0,SEEK_END);
fileSize=ftell(inFile);
fseek(inFile,0,SEEK_SET);
return fileSize;
}

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标签： C++ WAV音频文件

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