This wrapper class implements standard waveform APIs in object oriented way. It supports following features :
- Supports both wave_in and wave_out object in one class. You can indicate which type of stream to use by setting Direction.
- Use my own private stream device interface to abstract the real world stream behavior. This interface is still under development.
- All memory allocation and deallocation is managed by theobject itself. That is, the caller never worries about memory. This is achieved by using
IIDataSink interface defined by myself.
- The use of callback functions instead of callback windows. This is especially suitable for drawing intensive programs.
- The use of the private
IIAdvise interface, through which you can notify the client by window, thread ID, event and callback function. Very flexible. In my own project I use a separate thread to process the wave data.
- Support volume control on wave_in and wave_out stream.
- The use of
Release() to manage the object life cycle. (Similar to COM)
The package includes three files.
How to use my classes:
- Create a wave object
This contractor has couples parameters. Stream direction (in or out), wave in device id, wave out device id, wave in format, wave out format, wave in volume, wave out volume. Remember to call
- Wave device operation sequence :
- Whenever wave in data is incoming, the object itself will invoke, that is, callback to the client. Then client calls the
Read(ppData) function to get data buffer. After processing, client calls
ReadDone(pData) to return data buffer.
- Whenever the client wants to send data to the wave out device, it can call
Write() twice. The first call should provides an empty pointer, which will be filled with a valid buffer address. Then the client can write any data to this buffer, then call
Write() again to queue this buffer back to wave out object.
- Please call
Release() to free wave object.
- Create new wave object:
WaveForm = new CWaveForm
- Client advises call back interface:
(DWORD)m_hThread, 0, WM_STREAM_NOTIFY, CALLBACK_THREAD );
- Whenever wave in data is coming:
Invoke(WM_STREAM_NOTIFY, SUB_EVENT_WAVE_IN, 0);
- Client reading data:
- Client write data to wave out device:
PWAVEFRAME pWaveFrame = NULL;
- After using wave object: