音频WAV头

文件头结构体定义：

#pragma pack(1)
struct wave_header {
    char riff[4];
    unsigned long fileLength;
    char wavTag[4];
    char fmt[4];

    unsigned long size;
    unsigned short formatTag;
    unsigned short channel;
    unsigned long sampleRate;
    unsigned long bytePerSec;
    unsigned short blockAlign;
    unsigned short bitPerSample;
    char data[4];
    unsigned long dataSize;
};
#pragma pack()

数据初始化：

     wave_header header;
     memset(&header, 0, sizeof(header));
     header.riff[0] = 'R';
     header.riff[1] = 'I';
     header.riff[2] = 'F';
     header.riff[3] = 'F';
     header.fileLength = (ULONG)PCMNum*1764 + (44 - 8);

     header.wavTag[0] = 'W';
     header.wavTag[1] = 'A';
     header.wavTag[2] = 'V';
     header.wavTag[3] = 'E';

     header.fmt[0] = 'f';
     header.fmt[1] = 'm';
     header.fmt[2] = 't';
     header.fmt[3] = ' ';

     header.size = 16;
     header.formatTag = 1;
     header.channel = 2;
     header.sampleRate = 44100;
     header.bitPerSample = 16;
     header.blockAlign = header.channel * header.bitPerSample / 8;
     header.bytePerSec = header.blockAlign * header.sampleRate;

     header.data[0] = 'd';
     header.data[1] = 'a';
     header.data[2] = 't';
     header.data[3] = 'a';
     header.dataSize = (ULONG)PCMNum * 1764;