Log File..

mpallavi

Hi.. I had posted this query few days back also.. i am still not able to get the solution.. I need to maintain a log file that should contain the entries for the time a playback started and the time it ended. I am playing the wave files using Directx's DirectSound.. A separate thread takes care of the playback.. Mr. cedric had told me to find out what the callback function does.. the SetCallback function gets the audio stream data.. Is it possible to record the start and end times of the playback??? I am giving the related code here... ================================================== void CPhoneDlg::OnPlay() { ...... CTime theTime=CTime::GetCurrentTime(); CString startTime=theTime.Format( "%H:%M:%S, %B %d, %Y" ); WriteLogFile(startTime); m_pMyDS->Play(); m_timerID = timeSetEvent(500, 100, TimerProc, (DWORD)this, TIME_PERIODIC | TIME_CALLBACK_FUNCTION); CTime getTime=CTime::GetCurrentTime(); CString endTime=getTime.Format( "%H:%M:%S, %B %d, %Y" ); WriteLogFile(endTime); ...... } void CPhoneDlg::WriteLogFile(const char* szString) { FILE* pFile = fopen("logFile.txt", "a"); fprintf(pFile, "%s\n",szString); fclose(pFile); } //Some methods in the MyDirSound Class void CALLBACK TimerProcess(UINT uTimerID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2) { CMyDirSound *pDDS = (CMyDirSound *)dwUser; pDDS->TimerCallback(); } void CMyDirSound::SetCallback(LPGETAUDIOSAMPLES_PROGRESS Function_Callback, LPVOID lpData) { m_lpGETAUDIOSAMPLES = Function_Callback; m_lpData = lpData; } void CMyDirSound::Play() { //Check if the DirectSound was created successfully .......................... //Check if the callback function is valid .......................... //Check if SetFormat successfully .......................... if (0 == m_dwCircles1) { //Get audio data by callback function DWORD dwRetSamples = 0, dwRetBytes = 0; m_lpGETAUDIOSAMPLES(m_lpAudioBuf, m_WFE.nSamplesPerSec, dwRetSamples, m_lpData); dwRetBytes = dwRetSamples*m_WFE.nBlockAlign; //Write the audio data to DirectSoundBuffer ..... //Lock DirectSoundBuffer ..... //Copy Audio Buffer to DirectSoundBuffer ..... //Unlock DirectSoundBuffer .... } //Beging Play m_lpDSB->Play(0, 0, DSBPLAY_LOOPING); //timeSetEvent m_timerID = timeSetEvent(300, 100, TimerProcess, (DWORD)this, TIME_PERIODIC | TIME_CALLBACK_FUNCTION); } ============================================================== The waveforms which i play are

Christian Graus

I presume there's a callback you can register for that will notify you when the file stops playing. Christian Graus - Microsoft MVP - C++

mpallavi

Hi.. thank you.. Can you explain it in a bit detail.. I am new to DirectSound and programming multimedia applications.. What i should do exactly? regards pallavi

PJ Arends

Have a look at the IDirectSoundNotify interface.

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