C++读取WAV音频文件的头部数据的实现方法

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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