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The following table lists the messages that the ACM passes to the ACM drivers.
| Programming element | Description |
|---|---|
| ACMDM_DRIVER_ABOUT | Message that requests that the driver display its About dialog box. |
| ACMDM_DRIVER_DETAILS | Message that requests that the driver return detailed information about its capabilities. |
| ACMDM_DRIVER_NOTIFY | Message that notifies the driver of changes to other ACM drivers. |
| ACMDM_FILTER_DETAILS | Message that requests information about a filter that is associated with a specified filter tag. |
| ACMDM_FILTERTAG_DETAILS | Message that requests information about a specified filter tag. |
| ACMDM_FORMAT_DETAILS | Message that requests information about the format that is associated with a specified filter tag. |
| ACMDM_FORMAT_SUGGEST | Message that requests that the driver suggest a target conversion format for a specified source format. |
| ACMDM_FORMATTAG_DETAILS | Message that requests information about a format tag. |
| ACMDM_HARDWARE_WAVE_CAPS_INPUT | Message that requests information about the input capabilities of the audio hardware. |
| ACMDM_HARDWARE_WAVE_CAPS_OUTPUT | Message that requests information about the output capabilities of the audio hardware. |
| ACMDM_STREAM_CLOSE | Message that requests that the driver close a conversion stream. |
| ACMDM_STREAM_CONVERT | Message that requests that the driver convert an audio stream. |
| ACMDM_STREAM_OPEN | Message that requests that the driver open a new audio stream. |
| ACMDM_STREAM_PREPARE | Message that requests that the driver prepare any buffers that are associated with an audio stream. |
| ACMDM_STREAM_RESET | Message that requests that the driver stop operations on an audio stream. |
| ACMDM_STREAM_SIZE | Message that requests that the driver return the size that is required for a source or destination buffer. |
| ACMDM_STREAM_UNPREPARE | Message that requests that the driver clear any prepared buffers that are associated with an audio stream. |
| DRV_CLOSE | This message requests a driver to be closed. The codec receives a DRV_CLOSE message for each DRV_OPEN message that succeeds. |
| DRV_OPEN | This message requests a driver to be opened. Drivers are opened for many reasons. The most common reason is preparation for data conversion. Your driver must be able to handle multiple open-driver instances correctly. Multiple streams can and will be opened on a single driver instance. Do not store and/or create instance data that is unique to a stream. |
See Also
ACM Driver Functions | ACM Driver Structures
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