c．调用mmioclose函数来关闭wave文件.
7.麦克录音系统的实现(micdemo)
下面是该系统的界面:
对于录音来说最重要的就是csoundin类,下面就是该类的定义:
namespace perdubug { // prevent the name-space pollution
class csoundin
{
public:
bool __initmic(); // get the best wave format supported by your sound card
// and then i will use the format to capture sound.
void __closemic();
bool __openmic(); // open device and begin to capture with the best format(when
// invoke __initmic function then you will get the best format
// supported by host's sound card
//
// if your want to capture sound and export into a wav file please invoke this function
// to tell me the full path then i will create the wav file.
//
void __createoutputwavefile(const tchar * lpszfilename);
// if you invoke any member function return error/false please
// use this function to get the result...
dword __getlasterror();
//
// when the capture buffer is filled please invoke this function to 'add buffer'(actually
// you should create two-circular buffers,when 1st buffer is filled then switch to 2st,1st
// buffer will be wrote into wav file.
//
void addbuffer();
virtual ~csoundin();
friend csoundin & thesoundcapture();
private:
bool getbestwaveformat(waveformatex & waveformatex);
// because sound card is one and only so i must limit the number of csoundin object,
// but how to limit the class object nums?maybe put constructor into private scope is
// a good idea,:-)
csoundin();
private:
waveincaps m_waveindevcaps;
hwavein m_wavein;
wavehdr m_waveheader;
waveformatex m_waveformat;
uint m_waveinsamplerate;
int m_nbmaxsamples;
uint m_sizerecord;
dword m_dwlasterror;
enum { max_size_input_buffer = 1 * 2 * 1024 }; // samples * voie * size_samples
public:
short inputbuffer[max_size_input_buffer]; // used for int fft,many gui application
// want to display sound peak so..
bool m_bterminatethread; // to 'kill' wavecallback function
bool m_bimporttowavefile;
cwavefile m_wavefile;
};
} // end namespace perdubug
对于将录音保存在wav文件的工作主要是由cwavefile类来完成.下面是该类的定义:
//
// encapsulates reading or writing sound data to or from a wave file
//-----------------------------------------------------------------------------
class cwavefile
{
public:
waveformatex* m_pwfx; // pointer to waveformatex structure
