Microsoft Windows CE 3.0  

Playing Waveform Audio Files

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After opening a waveform audio output device driver successfully and preparing the header file, you can begin playing a sound. Windows provides the waveOutWriteand waveInAddBufferfunctions for sending data blocks to a waveform audio output device.

Use the WAVEHDRstructure to specify the waveform audio data block that you are sending by using the waveOutWriteor waveInAddBufferfunction. This structure contains a pointer to a locked data block, the length of the data block, and some flags. After you send a data block to an output device, wait until the device driver is finished with the data block before you free it. If you are sending multiple data blocks, monitor the completion of data blocks to know when to send additional blocks.

Note   Unless the waveform audio input and output data is contained in a single data block, an application must supply the device driver with data blocks continually until recording or playback is complete.

 Last updated on Tuesday, May 18, 2004

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