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Voice Recording/Playing back using simple classes

, , 17 Apr 2005
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This article introduces some useful classes that wrap the WAVE APIs.


Most of us are familiar with at least one multimedia recording software. Windows has one of the simplest ones: Sound Recorder. In this article I want to introduce some simple but useful classes for recording/playing back of voice that wrap the WAVE APIs.


Here is the list of all the Wave APIs that I have used:


waveInOpen Open the Wave device for recording.
waveInPrepareHeader Prepare the Wave header for recording.
waveInAddBuffer Add buffer
waveInStart Start recording. Recorded data will be saved in a specified buffer.
waveInUnprepareHeader After finishing the record process, should un-prepare Wave header.
waveInClose Close the recording device.


waveOutOpen Open the Wave device for playing.
waveOutPrepareHeader Prepare the Wave header for playing.
waveOutWrite Play the buffer.
waveOutUnprepareHeader Un-prepare the Wave header.
waveOutClose Close the playing device.

As you can see, working with these APIs are straightforward but if you want to skip them and simply do a copy/paste code in your project, my classes are for you.

Here is the definition of the classes:

class CVoiceBase  
    CString m_result;
    MMRESULT res;


    char* buffer;
    WAVEHDR WaveHeader;

    void SetFormat(DWORD nSamplesPerSec,  
            WORD  wBitsPerSample,WORD  nChannels);
    BOOL CopyBuffer(LPVOID lpBuffer, DWORD ntime);
    CString GetLastError();
    void GetMMResult(MMRESULT res);
    void DestroyBuffer();
    BOOL PrepareBuffer(DWORD ntime);
    virtual ~CVoiceBase();

class CVoiceRecording : public CVoiceBase  
    void RecordFinished();
    BOOL IsOpen();
    BOOL Close();
    BOOL Open();    
    BOOL Record();
    HWAVEIN hWaveIn;
    virtual ~CVoiceRecording();

class CVoicePlaying : public CVoiceBase  
    void PlayFinished();
    BOOL IsOpen();
    BOOL Close();
    BOOL Open();
    BOOL Play();

    HWAVEOUT hWaveOut;

    virtual ~CVoicePlaying();

Also, for notifying of events, such as finishing recording/playing, I have used two callback functions:

BOOL CALLBACK VoiceWaveInProc(HWAVEIN hwi,       
            UINT uMsg,         
            DWORD dwInstance,  
            DWORD dwParam1,    
            DWORD dwParam2     

BOOL CALLBACK VoiceWaveOutProc(HWAVEOUT hwi,       
            UINT uMsg,         
            DWORD dwInstance,  
            DWORD dwParam1,    
            DWORD dwParam2     


Just declare two variables of type CVoiceRecording and CVoicePlaying. Use SetFormat, PrepareBuffer, Open and Record or Play member functions to work with them:

CVoiceRecording m_Record;
CVoicePlaying m_Play;

m_Record.PrepareBuffer(10);    //prepare buffer for recording 10 seconds.
m_Play.PrepareBuffer(10);    //prepare buffer for playing of 10 seconds of data

if (m_Record.IsOpen())

//after finishing the record scenario,
//play the buffer, first copy recorded buffer to m_Play buffer
m_Play.CopyBuffer(m_Record.buffer, 10);
if (m_Play.IsOpen())



This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Authors

A. Riazi
CEO Misbah3Com
Iran (Islamic Republic Of) Iran (Islamic Republic Of)
I was born in Shiraz, a very beautiful famous city in Iran. I started programming when I was 12 years old with GWBASIC. Since now, I worked with various programming languages from Basic, Foxpro, C/C++, Visual Basic, Pascal to MATLAB and now Visual C++.
I graduated from Iran University of Science & Technology in Communication Eng., and now work as a system programmer for a telecommunication industry.
I wrote several programs and drivers for Synthesizers, Power Amplifiers, GPIB, GPS devices, Radio cards, Data Acqusition cards and so many related devices.
I'm author of several books like Learning C (primary and advanced), Learning Visual Basic, API application for VB, Teach Yourself Object Oriented Programming (OOP) and etc.
I'm winner of January, May, August 2003 and April 2005 best article of month competetion, my articles are:

You can see list of my articles, by clicking here

Web Developer
Iran (Islamic Republic Of) Iran (Islamic Republic Of)
No Biography provided

Comments and Discussions

Questionrecording wave file from voice modem Pingroupzendehdel19-Jul-14 23:47 
GeneralMy vote of 5 PinmemberMember 1038781122-Jan-14 19:56 
QuestionMMSystem.h PinmemberMember 1030607430-Sep-13 0:58 
AnswerRe: MMSystem.h PinprofessionalFrans Jan17-Jun-14 0:34 
Questionwriting a wave file to currecnt directory from buffer PinmemberMember 87012356-Apr-12 5:26 
GeneralMy vote of 4 PinmemberMember 87012356-Apr-12 5:24 
GeneralMy vote of 5 Pinmembermanoj kumar choubey26-Feb-12 20:50 
GeneralMy vote of 3 Pinmemberzwj72319-Feb-12 23:03 
Generalسلام Pinmembermahboob4666822-May-11 9:50 
GeneralI fatted this project,now can recording and playback at the same time ,minimal 50MA delay can play normal [modified] Pinmembererben16-Jan-11 17:20 
QuestionCould you please write it using VB .net? Pinmemberlowisdom8-Jun-10 18:08 
GeneralRecord only internal sound not what ever we talk too (how).. Pinmembersunil1501877-Apr-10 20:59 
Generalexecuting the program doesnt play nethn Pinmemberniki parmar17-Mar-10 9:06 
GeneralRe: executing the program doesnt play nethn Pinmemberniki parmar18-Mar-10 1:14 
GeneralA Little doubt Pinmemberblaomiao8-Nov-09 7:16 
GeneralPlay an array Pinmemberasef31-Oct-09 1:45 
GeneralTest of script Pinmembersupertotal3-Aug-09 11:42 
QuestionReg: How many minutes can I buffer I have to save it to a file PinmemberNikhil_777712-Jun-09 6:48 
QuestionHow do I make this program record until the user presses a key PinmemberNikhil_77772-Jun-09 9:02 
QuestionRe: How do I make this program record until the user presses a key PinmemberNikhil_77773-Jun-09 11:05 
Generalcall recording Pinmemberjoshi aniruddha27-Apr-09 1:52 
GeneralRe: call recording Pinmembervvhhbc23-Dec-09 19:20 
QuestionI successfully compiled the files. How do I save them to a file !! **Urgent** PinmemberNikhil_77775-Mar-09 12:28 
QuestionHas anyone successfully compiled this program ?? PinmemberNikhil_777719-Feb-09 17:41 
GeneralAbout License !! PinmemberNikhil_777713-Feb-09 7:08 

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