C++实现CD抓轨转WAV

C++实现CD抓轨转WAV

作者:黄利龙

现在介绍一下C++实现CD抓轨转WAV,CD抓轨的方法有好几种,现在介绍其中一种。我们可以通过API函数CreateFile获得设备句柄,再用API函数DeviceIoControl来实现对设备的访问获取信息。再此还会用到WAVE文件结构WAVEFORMATEX,再把读到的信息写到文件里生成WAVE格式的文件。

我们要用到的头文件有: ntddcdrm.h(NTDDK开发包) winioctl.h Mmreg.h

1、搜索光驱
我们可以用GetDriveType来判断设备类型,5为CDROM类型。返回类型可以参看MSDN,里面有详细介绍。

2、打开设备
用CreateFile获得设备句柄,例子如下:
    HANDLE m_hDevice;
    CString FileName=”F:”;
    m_hDevice =CreateFile("////.//"+FileName,                // 文件名路径
    GENERIC_READ,                                            // 读写方式
    FILE_SHARE_READ | FILE_SHARE_WRITE,                      // 共享方式
    NULL,                                                    // 默认的安全描述符
    OPEN_EXISTING,                                           // 创建方式
    0,                                                       // 不需设置文件属性
    NULL);                                                   // 不需参照模板文件

3、读取CD参数
得到了设备句柄,我们就可以用DeviceIoControl来获息相关信息.
DeviceIoControl函数原型:
    BOOL DeviceIoControl(
    HANDLE hDevice,                                 // 设备句柄
    DWORD dwIoControlCode,                          // 控制码
    LPVOID lpInBuffer,                              // 输入数据缓冲区指针
    DWORD nInBufferSize,                           // 输入数据缓冲区长度
    LPVOID lpOutBuffer,                             // 输出数据缓冲区指针
    DWORD nOutBufferSize,                          // 输出数据缓冲区长度
    LPDWORD lpBytesReturned,                        // 输出数据实际长度单元长度
    LPOVERLAPPED lpOverlapped                      // 重叠操作结构指针
    );

4、获取曲目
使用IOCTL_CDROM_READ_TOC控制码输出CDROM_TOC结构
  BOOL bResult;
  DWORD dwOutBytes;
  CDROM_TOC CdromTOC;               //曲目信息结构,详细请看MSDN
  bResult=DeviceIoControl(m_hDevice,
     IOCTL_CDROM_READ_TOC,NULL,0,
     &CdromTOC,
     sizeof(CdromTOC),
     &dwOutBytes, 
     (LPOVERLAPPED)NULL);

5、获取曲目始点
DWORD CCdToWavDlg::GetStartSector(int track)
{
         return (CdromTOC.TrackData[track-1].Address[1]*60*75     +
           CdromTOC.TrackData[track-1].Address[2]*75 +
           CdromTOC.TrackData[track-1].Address[3])-150;
}

6、获取曲目终点 DWORD CCdToWavDlg::GetEndSector(int track)
{
      return (CdromTOC.TrackData[track].Address[1]*60*75  +
         CdromTOC.TrackData[track].Address[2]*75 +
         CdromTOC.TrackData[track].Address[3])-151;
}

7、读取曲目信息
使用IOCTL_CDROM_RAW_READ输入RAW_READ_INFO结构信息,输出来获取区域内容 BOOL CCdToWavDlg::ReadSector(int sector,BYTE Buffer[], int NumSectors)
{
 DWORD dwOutBytes;
 RAW_READ_INFO rri; //结构详细请看MSDN
 rri.TrackMode =(TRACK_MODE_TYPE)2;
 rri.SectorCount = (DWORD)NumSectors;
 rri.DiskOffset =(DWORD64)(sector*CB_CDROMSECTOR);
 if (DeviceIoControl(m_hDevice,IOCTL_CDROM_RAW_READ,
  &rri,
  sizeof(rri),
  Buffer,
  (DWORD)NumSectors*CB_AUDIO,&dwOutBytes,
  (LPOVERLAPPED)NULL)) return true;
 return false;
}

8、文件生成

WAVE文件是非常简单的一种RIFF文件,它的格式类型为"WAVE"。RIFF块包含两个子块,这两个子块的ID分别是"fmt"和"data",其中"fmt"子块由结构WAVEFORMATEX所组成,其子块的大小就是sizeofof(WAVEFORMATEX),数据组成就是WAVEFORMATEX结构中的数据。WAVE文件的结构如下图所示:

标志符(RIFF)

数据大小

格式类型("WAVE")

"fmt"

Sizeof(WAVEFORMATEX)

WAVEFORMATEX

"data"

声音数据大小

声音数据

WAVEFORMATEX结构原型:
  typedef struct
  {
       WORD wFormatTag; //编码格式,包括WAVE_FORMAT_PCM,WAVEFORMAT_ADPCM等
       WORD nChannels; //声道数,单声道为1,双声道为2
       DWORD nSamplesPerSec; //采样频率
       DWORD nAvgBytesPerSec; //每秒的数据量
       WORD nBlockAlign; //块对齐
       WORD wBitsPerSample; //WAVE文件的采样大小
       WORD cbSize;
   } WAVEFORMATEX; *PWAVEFORMATEX;

9、定义WAVE文件结构    DWORD m_WaveHeaderSize = 38;
    DWORD m_WaveFormatSize = 18;
    DWORD m_AudioDataSize =0;
    DWORD m_WrittenBytes = 0;
    WAVEFORMATEX m_WaveFormatEx;
    m_WaveFormatEx.wFormatTag=WAVE_FORMAT_PCM ;
    m_WaveFormatEx.nSamplesPerSec=48000;
    m_WaveFormatEx.wBitsPerSample=16;
    m_WaveFormatEx.nChannels=2;
    m_WaveFormatEx.cbSize=0;
    m_WaveFormatEx.nBlockAlign=m_WaveFormatEx.nChannels*(m_WaveFormatEx.wBitsPerSample/8);
    m_WaveFormatEx.nAvgBytesPerSec=m_WaveFormatEx.nSamplesPerSec*m_WaveFormatEx.nBlockAlign;

10、创建新文件
    CFile m_file;
    CFileException fileException;
    CString m_csFileName= m_SavePath;
    m_file.Open(m_csFileName,CFile::modeCreate|CFile::modeReadWrite, &fileException);
    int StartSect=GetStartSector(m_List.GetCurSel()+1);
    int EndSect=GetEndSector(m_List.GetCurSel()+1);
    DWORD Bytes2Read=(EndSect - StartSect)*CB_AUDIO;
    m_AudioDataSize=Bytes2Read;
    BYTE Data[CB_AUDIO*NSECTORS];

11、写入WAV文件头
  WAV文件头一定要按顺序写入
  m_file.SeekToBegin();
  m_file.Write("RIFF",4);
  unsigned int Sec=(m_AudioDataSize + m_WaveHeaderSize);
  m_file.Write(&Sec,sizeof(Sec));
  m_file.Write("WAVE",4);
  m_file.Write("fmt ",4);
  m_file.Write(&m_WaveFormatSize,sizeof(m_WaveFormatSize));
  m_file.Write(&m_WaveFormatEx.wFormatTag,sizeof(m_WaveFormatEx.wFormatTag));
  m_file.Write(&m_WaveFormatEx.nChannels,sizeof(m_WaveFormatEx.nChannels));
  m_file.Write(&m_WaveFormatEx.nSamplesPerSec,sizeof(m_WaveFormatEx.nSamplesPerSec));
  m_file.Write(&m_WaveFormatEx.nAvgBytesPerSec,sizeof(m_WaveFormatEx.nAvgBytesPerSec));
  m_file.Write(&m_WaveFormatEx.nBlockAlign,sizeof(m_WaveFormatEx.nBlockAlign));
  m_file.Write(&m_WaveFormatEx.wBitsPerSample,sizeof(m_WaveFormatEx.wBitsPerSample));
  m_file.Write(&m_WaveFormatEx.cbSize,sizeof(m_WaveFormatEx.cbSize));
  m_file.Write("data",4);
  m_file.Write(&m_AudioDataSize,sizeof(m_AudioDataSize));

12、写入音频数据
把音频数据放到WAV文件头后写入
   DWORD m_seek=46; //文件头长度为46个字,必须从46后写入
   for (int sector = StartSect; (sector < EndSect); sector+=NSECTORS)
   {
         int Sectors2Read = ( (sector + NSECTORS) < EndSect )?NSECTORS:(EndSect-sector);
         if (ReadSector(sector, Data, Sectors2Read))
         {
               m_file.Write(Data,CB_AUDIO*Sectors2Read);
               m_file.Seek(m_seek+=CB_AUDIO*Sectors2Read,CFile::begin);
         }
   }
   m_file.Close();

以上在 VC7+Window2000+NTDDK 测试通过。

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