Qt由pcm数据生成wav文件

void AudioGrabber::saveWave(const QString &fileName, const QByteArray
&raw, const QAudioFormat &format)
{
    typedef
struct{
        char
riff_fileid[4];//"RIFF"
        DWORD
riff_fileLen;
        char
waveid[4];//"WAVE"

        char
fmt_chkid[4];//"fmt"
        DWORD
fmt_chkLen;

       
WORD    wFormatTag;        /*
format type */
       
WORD   
nChannels;         /* number of channels
(i.e. mono, stereo, etc.) */
       
DWORD   nSamplesPerSec;    /* sample rate
*/
        DWORD  
nAvgBytesPerSec;   /* for buffer estimation
*/
        WORD   
nBlockAlign;       /* block size of data
*/
        WORD   
wBitsPerSample;

        char
data_chkid[4];//"DATA"
        WORD
data_chkLen;
    }WaveHeader;

   
WaveHeader wh={0};
    strcpy(wh.riff_fileid,
"RIFF");
    wh.riff_fileLen = raw.length() +
32;
    strcpy(wh.waveid, "WAVE");

   
strcpy(wh.fmt_chkid, "fmt ");
    wh.fmt_chkLen =
16;

    wh.wFormatTag =
WAVE_FORMAT_PCM;
    wh.nChannels =
format.channels();
    wh.nSamplesPerSec =
format.frequency();
    wh.wBitsPerSample =
format.sampleSize();
    wh.nBlockAlign
=wh.nChannels*wh.wBitsPerSample/8;
    wh.nAvgBytesPerSec
=   wh.nBlockAlign*wh.nSamplesPerSec;

   
strcpy(wh.data_chkid, "data");
    wh.data_chkLen =
raw.length();

    QFile f(fileName);
   
f.open(QFile::WriteOnly);
    f.write((char *)&wh,
sizeof(wh));
    f.write(raw);
   
f.close();
}