C++实现CD抓轨转WAV
2006-07-23 11:32:25 来源:WEB开发网本文示例源代码或素材下载
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();
详细请看源代码。以上在 VC7+Window2000+NTDDK 测试通过。
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