Waveform Audio Messages
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4/8/2010
Wave application programming interface (API) messages fall into two categories: window messages and callback function messages. The following table shows these messages.
| Programming element | Description |
|---|---|
This message is used to query the preferred device, using the existing waveInMessage or waveOutMessage function to the WAVE_MAPPER device id. |
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This message is sent through the waveInMessage or waveOutMessage function to set the preferred device ID of the device referenced by WAVE_MAPPER to a new value. |
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Commands the driver to stop generating a MIDI note at a specified frequency. |
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Commands the driver to begin generating a MIDI note at a specified frequency. |
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Sent to the driver to set a new tempo for MIDI playback. |
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This message is sent to a window when a waveform-audio input device is closed. |
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This message is sent to a window when waveform-audio data is present in the input buffer and the buffer is being returned to the application. |
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This message is sent to a window when a waveform-audio input device is opened. |
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This message indicates that an audio stream is controlled by an audio gain class. |
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This message is sent to a window when a waveform-audio output device is closed. |
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This message is sent to a window when the given output buffer is being returned to the application. |
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This message is used to make sure that an audio stream is routed to the external speaker on a Windows Mobile device. |
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This message is sent to a window when the given waveform-audio output device is opened. |
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This message associates a stream context with an attenuation class. |
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This message places a limit on the maximum volume for all streams associated with an attenuation class and scales the streams' volumes accordingly. |
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This message is sent to the given waveInProc callback function when a waveform-audio input device is closed. |
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This message is sent to the given waveInProc callback function when waveform-audio data is present in the input buffer and the buffer is being returned to the application. |
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This message is sent to a waveInProc callback function when a waveform-audio input device is opened. |
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This message is sent to a waveOutProc callback function when a waveform-audio output device is closed. |
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This message is sent to a waveOutProc callback function when the given output buffer is being returned to the application. |
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This message is sent to a waveOutProc callback function when a waveform-audio output device is opened. |