PDD_AudioGetInterruptType (Windows CE 5.0)
This function determines the cause of the audio interrupt and returns the current device status.
AUDIO_STATE PDD_AudioGetInterruptType(void);
Return Values
An integer indicating the type of interrupt. The defined values are listed as follows.
| Defined value | Description |
|---|---|
| AUDIO_STATE_OUT_PLAYING | Sound is currently playing. |
| AUDIO_STATE_OUT_UNDERFLOW | Sound was playing, but not enough data has been supplied to continue. |
| AUDIO_STATE_OUT_STOPPED | Playback is stopped. |
| AUDIO_STATE_IN_RECORDING | Sound is currently recording. |
| AUDIO_STATE_IN_OVERFLOW | Sound was recording, but the reserve buffer was not processed in time before the DMA needed to write to it again. |
| AUDIO_STATE_IN_STOPPED | Recording is stopped. |
| AUDIO_STATE_IGNORE | The interrupt does not represent a state change or update and should be ignored by the MDD. This state can be used to report a PDD private interrupt. For example, initializing a CODEC may generate an interrupt that need not be reported. |
| AUDIO_STATE_OUT_MASK | Bitmask for the output state (0xF0). |
| AUDIO_STATE_IN_MASK | Bitmask for the input state (0x0F). |
Remarks
This function supports the implementation of the audio PDD.
The PDD reports the status of the playback or record circuitry. The interrupt occurs when the audio DMA passes a buffer boundary. See the AUDIO_STATE return values for the possible states that an interrupt can represent.
AUDIO_STATE is the state of the audio device. This value can represent a state change of either the input or the output circuit or both. The lower 4 bits represents the input status, and the upper 4 bits represents the output status; so if the current interrupt is for both input and output, the values can be combined using the OR operator. However, if the interrupt represents only one circuit, the other 4 bits should remain 0; otherwise, the MDD interprets this as a change or update in the circuit's status.
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Waveddsi.h.
See Also
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