Media.Streaming.GStreamer.Core.Event

An object describing events that are passed up and down a pipeline.

Detail

An Event is a message that is passed up and down a pipeline.

There are a number of predefined events and functions returning events. To send an event an application will usually use elementSendEvent, and elements will use padSendEvent or padPushEvent.

Types

data Event

Instances

Eq Event

Ord Event

MiniObjectClass Event

EventClass Event

class MiniObjectClass o => EventClass o

Instances

EventClass Event

data EventType

The event types that may occur in a pipeline.

Constructors

EventUnknown

an unknown event

EventFlushStart

start a flush operation

EventFlushStop

stop a flush operation

EventEOS

end of stream

EventNewSegment

a new segment follows in the dataflow

EventTag

a new set of metadata tags has been found

EventBufferSize

notification of buffering requirements

EventQOS

quality of service notification

EventSeek

a request for a new playback position and rate

EventNavigation

notification of user request

EventLatency

notification of latency adjustment

EventCustomUpstream

custom upstream event

EventCustomDownstream

custom downstream event

EventCustomDownstreamOOB

custom downstream out-of-band event

EventCustomBoth

custom bidirectional event

EventCustomBothOOB

custom bidirectional out-of-band event

Instances

Bounded EventType

Enum EventType

Eq EventType

Show EventType

data SeekFlags

Constructors

SeekFlagNone

SeekFlagFlush

SeekFlagAccurate

SeekFlagKeyUnit

SeekFlagSegment

SeekFlagSkip

Instances

Bounded SeekFlags

Enum SeekFlags

Eq SeekFlags

Show SeekFlags

Flags SeekFlags

data SeekType

Constructors

SeekTypeNone

SeekTypeCur

SeekTypeSet

SeekTypeEnd

Instances

Enum SeekType

Eq SeekType

Show SeekType

Event Operations

eventType :: EventClass event => event -> EventType

eventNewCustom :: EventType -> Structure -> IO Event

eventNewEOS :: IO Event

eventNewFlushStart :: IO Event

eventNewFlushStop :: IO Event

eventNewLatency :: ClockTime -> IO Event

eventNewNavigation :: Structure -> IO Event

eventNewNewSegment :: Bool -> Double -> Format -> Int64 -> Int64 -> Int64 -> IO Event

eventNewNewSegmentFull :: Bool -> Double -> Double -> Format -> Int64 -> Int64 -> Int64 -> IO Event

eventNewQOS :: Double -> ClockTimeDiff -> ClockTime -> IO Event

eventNewSeek :: Double -> Format -> [SeekFlags] -> SeekType -> Int64 -> SeekType -> Int64 -> IO Event

eventNewTag :: TagList -> IO Event

eventParseBufferSize :: EventClass event => event -> Maybe (Format, Int64, Int64, Bool)

eventParseLatency :: EventClass event => event -> Maybe ClockTime

eventParseNewSegment :: EventClass event => event -> Maybe (Bool, Double, Format, Int64, Int64, Int64)

eventParseNewSegmentFull :: EventClass event => event -> Maybe (Bool, Double, Double, Format, Int64, Int64, Int64)

eventParseQOS :: EventClass event => event -> Maybe (Double, ClockTimeDiff, ClockTime)

eventParseSeek :: EventClass event => event -> Maybe (Double, Format, [SeekFlags], SeekType, Int64, SeekType, Int64)

eventParseTag :: EventClass event => event -> Maybe TagList

eventTypeGetName :: EventType -> String

eventTypeGetFlags :: EventType -> [EventTypeFlags]