Function

ALSARawmidiget_substream_info

Declaration [src]

gboolean
alsarawmidi_get_substream_info (
  guint card_id,
  guint device_id,
  ALSARawmidiStreamDirection direction,
  guint subdevice_id,
  ALSARawmidiSubstreamInfo** substream_info,
  GError** error
)

Description [src]

Get the information of substream pointed by the numeric identifier of card, device, subdevice, and the direction.

The call of function executes open(2), close(2), and ioctl(2) system call with SNDRV_CTL_IOCTL_RAWMIDI_INFO command for ALSA control character device.

Parameters

`card_id`	`guint`
	The numeric value for sound card to query.
`device_id`	`guint`
	The numeric value of rawmidi device to query.
`direction`	`ALSARawmidiStreamDirection`
	The direction of stream, one of `ALSARawmidiStreamDirection`.
`subdevice_id`	`guint`
	The numeric value of subdevice in rawmidi device.
`substream_info`	`ALSARawmidiSubstreamInfo`
	The information of substream for the subdevice.
	The argument will be set by the function.
	The called function takes ownership of the data, and is responsible for freeing it.
`error`	`GError **`
	The return location for a `GError*`, or `NULL`.

Return value

Returns:	`gboolean`
	`TRUE` when the overall operation finishes successfully, else `FALSE`.