C++读取WAV音频文件的头部数据的实现方法

#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;}