Sound.ALSA.Sequencer.Event.RemoveMonad

This module allows to cancel events according to some criteria. In all cases other than setInput and setOutput the criteria are combined by logical AND. For every criterion we provide three kinds of accessors:

• set: enable a criterion
• put: enable or disable a criterion
• get: query, whether the criterion is enabled or disabled.

Currently only the set functions are really usable. The put and get functions would become useful for manipulating the remove criterion record, that ALSA maintains.

Documentation

data T a

Instances

Applicative T

Defined in Sound.ALSA.Sequencer.Event.RemoveMonad

Methods

pure :: a -> T a

(<*>) :: T (a -> b) -> T a -> T b

liftA2 :: (a -> b -> c) -> T a -> T b -> T c

(*>) :: T a -> T b -> T b

(<*) :: T a -> T b -> T a

Functor T

Defined in Sound.ALSA.Sequencer.Event.RemoveMonad

Methods

fmap :: (a -> b) -> T a -> T b

(<$) :: a -> T b -> T a

Monad T

Defined in Sound.ALSA.Sequencer.Event.RemoveMonad

Methods

(>>=) :: T a -> (a -> T b) -> T b

(>>) :: T a -> T b -> T b

return :: a -> T a

run :: T mode -> T a -> IO a

Remove events according to the given conditions

setInput :: T ()

All events in the local input buffer are removed. The conditions are not checked for these events. This is equivalent to dropInputBuffer.

putInput :: Bool -> T ()

getInput :: T Bool

setOutput :: T ()

Matching events in the local output buffer are removed, too. Matching events in the kernel buffer are removed in any case. If there are no further conditions, then this is equivalent to dropOutputBuffer.

putOutput :: Bool -> T ()

getOutput :: T Bool

setChannel :: Channel -> T ()

putChannel :: Maybe Channel -> T ()

getChannel :: T (Maybe Channel)

setEventType :: Type e => e -> T ()

putEventType :: Type e => Maybe e -> T ()

setTag :: Tag -> T ()

putTag :: Maybe Tag -> T ()

getTag :: T (Maybe Tag)

setDest :: (T, T) -> T ()

ALSA maintainers say, that destination address and queue are checked together, at least in the kernel buffer. However up to ALSA-1.0.22 the check for the queue is missing in libasound for the local buffer.

putDest :: Maybe (T, T) -> T ()

getDest :: T (Maybe (T, T))

setTime :: Ordering -> Stamp -> T ()

putTime :: Maybe Ordering -> Stamp -> T ()

getTime :: T (Maybe Ordering, Stamp)

setIgnoreOff :: T ()

NoteOff events are kept in any case.

putIgnoreOff :: Bool -> T ()

getIgnoreOff :: T Bool