MediaRecorder QML 类型

要编码和录制的媒体生成于 CaptureSession . 更多...

import 语句：	import QtMultimedia
实例化：	QMediaRecorder

所有成员列表，包括继承成员

特性

actualLocation : QUrl
duration : qint64
error : enumeration
errorString : string
isAvailable : bool
mediaFormat : MediaFormat
metaData : mediaMetaData
outputLocation : QUrl
quality : enumeration
recorderState : enumeration

信号

actualLocationChanged (const QUrl & location )
durationChanged (qint64 duration )
errorOccurred (Error error , const QString & errorString )
metaDataChanged ()
recorderStateChanged (RecorderState state )

方法

pause ()
record ()
stop ()

详细描述

The MediaRecorder element can be used within a CaptureSession to record and encode audio and video captured from a microphone and camera

The code below shows a simple capture session containing a MediaRecorder using the default camera and default audio input.

CaptureSession {
    id: captureSession
    camera: Camera {
        id: camera
        active: true
    }
    audioInput: AudioInput {}
    recorder: MediaRecorder {
        id: recorder
    }
}

The code below shows how the recording can be started and stopped.

CameraButton {
    text: "Record"
    visible: recorder.recorderState !== MediaRecorder.RecordingState
    onClicked: recorder.record()
}
CameraButton {
    id: stopButton
    text: "Stop"
    visible: recorder.recorderState === MediaRecorder.RecordingState
    onClicked: recorder.stop()
}

另请参阅 CaptureSession , Camera , AudioInput ，和 ImageCapture .

特性文档编制

[read-only] actualLocation : QUrl

The actual location of the last media content.

The actual location is usually available after recording starts, and reset when new location is set or new recording starts.

[read-only] duration : qint64

此特性保持录制媒体的持续时间 (以毫秒为单位)。

[read-only] error : enumeration

This property holds the current media recorder error state.

常量	描述
`MediaRecorder.NoError`	Not in an error state.
`MediaRecorder.ResourceError`	Not enough system resources
`MediaRecorder.FormatError`	the current format is not supported.
`MediaRecorder.OutOfSpaceError`	设备没有剩余空间。
`MediaRecorder.LocationNotWriteable`	输出位置不可写。

[read-only] errorString : string

This property holds a string describing the current error state.

另请参阅 error .

isAvailable : bool

This property holds whether the recorder service is ready to use.

返回 true if media recorder service ready to use.

mediaFormat : MediaFormat

This property holds the current MediaFormat of the recorder.

metaData : mediaMetaData

This property holds meta data associated with the recording.

When a recording is started, any meta-data assigned will be attached to that recording.

注意： Ensure that meta-data is assigned correctly by assigning it before starting the recording.

另请参阅 mediaMetaData .

outputLocation : QUrl

The destination location of media content.

Setting the location can fail, for example when the service supports only local file system locations but a network URL was passed. If the operation fails an errorOccured() signal is emitted.

The location can be relative or empty. If empty the recorder uses the system specific place and file naming scheme.

另请参阅 errorOccurred ().

quality : enumeration

枚举品质编码级别。

常量	值
`MediaRecorder.VeryLowQuality`
`MediaRecorder.LowQuality`
`MediaRecorder.NormalQuality`
`MediaRecorder.HighQuality`
`MediaRecorder.VeryHighQuality`

[read-only] recorderState : enumeration

This property holds the current media recorder state.

The state property represents the user request and is changed synchronously during record (), pause () 或 stop () calls. RecorderSstate may also change asynchronously when recording fails.

常量	描述
`MediaRecorder.StoppedState`	录制器不活动。
`MediaRecorder.RecordingState`	请求录制。
`MediaRecorder.PausedState`	The recorder is pause.

信号文档编制

actualLocationChanged (const QUrl & location )

Signals that the actual location of the recorded media has changed.

This signal is usually emitted when recording starts.

注意： 相应处理程序是 onActualLocationChanged .

durationChanged ( qint64 duration )

信号 duration of the recorded media has changed.

注意： 相应处理程序是 onDurationChanged .

errorOccurred ( Error error , const QString & errorString )

Signals that an error has occurred.

The errorString contains a description of the error.

注意： 相应处理程序是 onErrorOccurred .

metaDataChanged ()

Signals that a media object's meta-data has changed.

If multiple meta-data elements are changed metaDataChanged() is emitted once.

注意： 相应处理程序是 onMetaDataChanged .

recorderStateChanged ( RecorderState state )

Signals that a media recorder's state 已改变。

注意： 相应处理程序是 onRecorderStateChanged .

方法文档编制

pause ()

暂停录制。

The recorder state is changed to QMediaRecorder .PausedState.

Depending on the platform, pausing recording may be not supported. In this case the recorder state is unchanged.

record ()

Starts recording.

While the recorder state is changed immediately to MediaRecorder.RecordingState , recording may start asynchronously.

If recording fails, the error() signal is emitted with recorder state being reset back to QMediaRecorder.StoppedState .

注意： On mobile devices, recording will happen in the orientation the device had when calling record and is locked for the duration of the recording. To avoid artifacts on the user interface, we recommend to keep the user interface locked to the same orientation as long as the recording is ongoing using the contentOrientation property of the Window and unlock it again once the recording is finished.

stop ()

Stops the recording.

The recorder will stop the recording. Processing pending video and audio data might however still take some time. The recording is finished, once the state of the media recorder changes to QMediaRecorder::StoppedState .