BassAsioBASS_ASIO_Init Method

[DllImportAttribute("bassasio")]
public static bool BASS_ASIO_Init(
	int device,
	BASSASIOInit flags
)

<DllImportAttribute("bassasio">]
Public Shared Function BASS_ASIO_Init ( 
	device As Integer,
	flags As BASSASIOInit
) As Boolean

Parameters

device

Type: SystemInt32
The device to use... 0 = first device, -1 = first available device. BASS_ASIO_GetDeviceInfo(Int32, BASS_ASIO_DEVICEINFO) can be used to get the total number of devices.

flags

Type: Un4seen.BassAsioBASSASIOInit
Any combination of these flags (see BASSASIOInit):

BASS_ASIO_THREAD	Host the driver in a dedicated thread, else the current thread.
BASS_ASIO_JOINORDER	Place joined channels in the order in which BASS_ASIO_ChannelJoin(Boolean, Int32, Int32) was called to join them, else place them in numerically ascending order.
BASS_ASIO_VOLRAMP	Ramp volume changes (of output channels).

Return Value

This function must be successfully called before any input or output can be performed. When the first available device is initialized, BASS_ASIO_GetDeviceInfo(Int32, BASS_ASIO_DEVICEINFO) can be used afterwards to find out which device that is.

The ASIO driver is accessed via a COM object using the single-threaded apartment model, which means that requests to the driver go through the thread that initialized it, so the thread needs to exist as long as the driver remains initialized. The thread should also have a message queue. If device initializing and releasing from multiple threads is required, or the application does not have a message queue (eg. a console application), then the BASS_ASIO_THREAD flag can be used to have BASSASIO create a dedicated thread to host the ASIO driver.

Simultaneously using multiple devices is supported in the BASSASIO API via a context switching system - instead of there being an extra "device" parameter in the function calls, the device to be used is set prior to calling the functions. BASS_ASIO_SetDevice(Int32) is used to switch the current device. When successful, BASS_ASIO_Init automatically sets the current thread's device to the one that was just initialized.

Reference