QMediaPlayer 类

QMediaPlayer 类允许播放媒体源。更多...

头：	#include <QMediaPlayer>
qmake:	QT += multimedia
继承：	QMediaObject

公共类型

enum	Error { NoError, ResourceError, FormatError, NetworkError, AccessDeniedError, ServiceMissingError }
enum	Flag { LowLatency, StreamPlayback, VideoSurface }
flags	Flags
enum	MediaStatus { UnknownMediaStatus, NoMedia, LoadingMedia, LoadedMedia, StalledMedia, …, InvalidMedia }
enum	State { StoppedState, PlayingState, PausedState }

特性

audioAvailable : const bool
audioRole : QAudio::Role
bufferStatus : const int
currentMedia : const QMediaContent
customAudioRole : QString
duration : const qint64
error : const QString
media : QMediaContent
mediaStatus : const MediaStatus

muted : bool
playbackRate : qreal
playlist : QMediaPlaylist*
position : qint64
seekable : const bool
state : const State
videoAvailable : const bool
volume : int

公共函数

	QMediaPlayer (QObject * parent = nullptr, QMediaPlayer::Flags flags = Flags())
virtual	~QMediaPlayer ()
QAudio::Role	audioRole () const
int	bufferStatus () const
QMediaContent	currentMedia () const
QString	customAudioRole () const
qint64	duration () const
QMediaPlayer::Error	error () const
QString	errorString () const
bool	isAudioAvailable () const
bool	isMuted () const
bool	isSeekable () const
bool	isVideoAvailable () const
QMediaContent	media () const
QMediaPlayer::MediaStatus	mediaStatus () const
const QIODevice *	mediaStream () const
qreal	playbackRate () const
QMediaPlaylist *	playlist () const
qint64	position () const
void	setAudioRole (QAudio::Role audioRole )
void	setCustomAudioRole (const QString & audioRole )
void	setVideoOutput (QVideoWidget * output )
void	setVideoOutput (QGraphicsVideoItem * output )
void	setVideoOutput (QAbstractVideoSurface * surface )
void	setVideoOutput (const QVector<QAbstractVideoSurface > & surfaces* )
QMediaPlayer::State	state () const
QList<QAudio::Role>	supportedAudioRoles () const
QStringList	supportedCustomAudioRoles () const
int	volume () const

重实现公共函数

virtual QMultimedia::AvailabilityStatus

availability () const override

公共槽

void	pause ()
void	play ()
void	setMedia (const QMediaContent & media , QIODevice * stream = nullptr)
void	setMuted (bool muted )
void	setPlaybackRate (qreal rate )
void	setPlaylist (QMediaPlaylist * playlist )
void	setPosition (qint64 position )
void	setVolume (int volume )
void	stop ()

信号

void	audioAvailableChanged (bool available )
void	audioRoleChanged (QAudio::Role role )
void	bufferStatusChanged (int percentFilled )
void	currentMediaChanged (const QMediaContent & media )
void	customAudioRoleChanged (const QString & role )
void	durationChanged (qint64 duration )
void	error (QMediaPlayer::Error error )
void	mediaChanged (const QMediaContent & media )
void	mediaStatusChanged (QMediaPlayer::MediaStatus status )
void	mutedChanged (bool muted )
void	playbackRateChanged (qreal rate )
void	positionChanged (qint64 position )
void	seekableChanged (bool seekable )
void	stateChanged (QMediaPlayer::State state )
void	videoAvailableChanged (bool videoAvailable )
void	volumeChanged (int volume )

静态公共成员

QMultimedia::SupportEstimate

hasSupport (const QString & mimeType , const QStringList & codecs = QStringList(), QMediaPlayer::Flags flags = Flags())

详细描述

QMediaPlayer 类是高级媒体播放类。可用于回放歌曲、电影及互联网广播内容。将要回放的内容指定为 QMediaContent 对象，可以认为是附加了额外信息的主 URL 或典型 URL。当提供采用 QMediaContent 回放也许可以开始。

player = new QMediaPlayer;
connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));
player->setMedia(QUrl::fromLocalFile("/Users/me/Music/coolsong.mp3"));
player->setVolume(50);
player->play();

QVideoWidget can be used with QMediaPlayer for video rendering and QMediaPlaylist 为访问播放列表功能。

playlist = new QMediaPlaylist;
playlist->addMedia(QUrl("http://example.com/movie1.mp4"));
playlist->addMedia(QUrl("http://example.com/movie2.mp4"));
playlist->addMedia(QUrl("http://example.com/movie3.mp4"));
playlist->setCurrentIndex(1);
player = new QMediaPlayer;
player->setPlaylist(playlist);
videoWidget = new QVideoWidget;
player->setVideoOutput(videoWidget);
videoWidget->show();
player->play();

由于 QMediaPlayer 是 QMediaObject ，可以使用几个 QMediaObject 函数对于像这样的事情：

访问目前播放媒体元数据 ( QMediaObject::metaData () 和预定义元数据键 )
校验媒体回放服务目前是否可用 ( QMediaObject::availability ())

另请参阅 QMediaObject , QMediaService , QVideoWidget ，和 QMediaPlaylist .

成员类型文档编制

enum QMediaPlayer:: Error

定义媒体播放器错误条件。

常量	值	描述
`QMediaPlayer::NoError`	`0`	没有出现错误。
`QMediaPlayer::ResourceError`	`1`	无法解析媒体资源。
`QMediaPlayer::FormatError`	`2`	不 (完全) 支持媒体资源格式。仍可能可以回放，但没有音频或视频组件。
`QMediaPlayer::NetworkError`	`3`	发生网络错误。
`QMediaPlayer::AccessDeniedError`	`4`	没有适当权限来播放媒体资源。
`QMediaPlayer::ServiceMissingError`	`5`	找不到有效回放服务，无法继续进行播放。开头

enum QMediaPlayer:: Flag
flags QMediaPlayer:: Flags

常量	值	描述
`QMediaPlayer::LowLatency`	`0x01`	The player is expected to be used with simple audio formats, but playback should start without significant delay. Such playback service can be used for beeps, ringtones, etc.
`QMediaPlayer::StreamPlayback`	`0x02`	播放器期望播放 QIODevice 基流。若传递给 QMediaPlayer constructor, the service supporting streams playback will be chosen.
`QMediaPlayer::VideoSurface`	`0x04`	The player is expected to be able to render to a QAbstractVideoSurface output .

Flags 类型是 typedef 对于 QFlags <Flag>。它存储 Flag 值的 OR 组合。

enum QMediaPlayer:: MediaStatus

定义媒体播放器当前媒体的状态。

常量	值	描述
`QMediaPlayer::UnknownMediaStatus`	`0`	无法确定媒体状态。
`QMediaPlayer::NoMedia`	`1`	当前媒体不存在。播放器处于 StoppedState .
`QMediaPlayer::LoadingMedia`	`2`	当前正加载媒体。播放器可能处于任何状态。
`QMediaPlayer::LoadedMedia`	`3`	当前媒体已加载。播放器处于 StoppedState .
`QMediaPlayer::StalledMedia`	`4`	当前媒体的回放已失速，由于缓冲不足或某些其它临时中断。播放器在 PlayingState or PausedState .
`QMediaPlayer::BufferingMedia`	`5`	播放器正在缓冲数据，但已缓冲足够数据，以便在不久的将来能继续回放。播放器在 PlayingState or PausedState .
`QMediaPlayer::BufferedMedia`	`6`	播放器已完全缓冲当前媒体。播放器处于 PlayingState or PausedState .
`QMediaPlayer::EndOfMedia`	`7`	回放已到达当前媒体结尾。播放器处于 StoppedState .
`QMediaPlayer::InvalidMedia`	`8`	当前媒体无法播放。播放器处于 StoppedState .

enum QMediaPlayer:: State

定义媒体播放器的当前状态。

常量	值	描述
`QMediaPlayer::StoppedState`	`0`	媒体播放器未播放内容，回放将从当前轨道的起始开始。
`QMediaPlayer::PlayingState`	`1`	媒体播放器目前正在播放内容。
`QMediaPlayer::PausedState`	`2`	媒体播放器已暂停回放，当前轨道的回放将从播放器暂停位置处再继续。

特性文档编制

audioAvailable : const bool

此特性保持当前媒体的音频可用性状态。

As the life time of QMediaPlayer can be longer than the playback of one QMediaContent , this property may change over time, the audioAvailableChanged signal can be used to monitor it's status.

访问函数：

bool	isAudioAvailable () const

通知程序信号：

void	audioAvailableChanged (bool available )

audioRole : QAudio::Role

This property holds the role of the audio stream played by the media player.

It can be set to specify the type of audio being played, allowing the system to make appropriate decisions when it comes to volume, routing or post-processing.

必须设置音频角色，先于调用 setMedia ().

customAudioRole is cleared when this property is set to anything other than QAudio::CustomRole .

该特性在 Qt 5.6 引入。

访问函数：

QAudio::Role	audioRole () const
void	setAudioRole (QAudio::Role audioRole )

通知程序信号：

void	audioRoleChanged (QAudio::Role role )

另请参阅 supportedAudioRoles ().

bufferStatus : const int

This property holds the percentage of the temporary buffer filled before playback begins or resumes, from 0 (空) 到 100 (完整)。

When the player object is buffering; this property holds the percentage of the temporary buffer that is filled. The buffer will need to reach 100% filled before playback can start or resume, at which time mediaStatus () 会返回 BufferedMedia or BufferingMedia . If the value is anything lower than 100 , mediaStatus () 会返回 StalledMedia .

访问函数：

int	bufferStatus () const

通知程序信号：

void	bufferStatusChanged (int percentFilled )

另请参阅 mediaStatus ().

currentMedia : const QMediaContent

This property holds the current active media content being played by the player object. This value could be different from QMediaPlayer::media property if a playlist is used. In this case currentMedia indicates the current media content being processed by the player, while QMediaPlayer::media property contains the original playlist.

访问函数：

QMediaContent

currentMedia () const

通知程序信号：

void	currentMediaChanged (const QMediaContent & media )

另请参阅 QMediaContent and media ().

customAudioRole : QString

This property holds the role of the audio stream played by the media player.

It can be set to specify the type of audio being played when the backend supports audio roles unknown to Qt. Specifying a role allows the system to make appropriate decisions when it comes to volume, routing or post-processing.

必须设置音频角色，先于调用 setMedia ().

audioRole 被设为 QAudio::CustomRole 当此特性有设置。

该特性在 Qt 5.11 引入。

访问函数：

QString	customAudioRole () const
void	setCustomAudioRole (const QString & audioRole )

通知程序信号：

void	customAudioRoleChanged (const QString & role )

另请参阅 supportedCustomAudioRoles ().

duration : const qint64

此特性保持当前媒体的持续时间。

The value is the total playback time in milliseconds of the current media. The value may change across the life time of the QMediaPlayer object and may not be available when initial playback begins, connect to the durationChanged () signal to receive status notifications.

访问函数：

qint64

duration () const

通知程序信号：

void	durationChanged (qint64 duration )

error : const QString

此特性保持描述最后一个错误条件的字符串。

访问函数：

QString

errorString () const

另请参阅 error ().

media : QMediaContent

此特性保持播放器对象正在使用的活动媒体源。

播放器对象将使用 QMediaContent for selection of the content to be played.

默认情况下,此特性拥有 null QMediaContent .

将此特性设为 null QMediaContent will cause the player to discard all information relating to the current media source and to cease all I/O operations related to that media.

访问函数：

QMediaContent	media () const
void	setMedia (const QMediaContent & media , QIODevice * stream = nullptr)

通知程序信号：

void	mediaChanged (const QMediaContent & media )

另请参阅 QMediaContent and currentMedia ().

mediaStatus : const MediaStatus

此特性保持当前媒体流的状态。

流状态描述当前流的回放进展。

默认情况下此特性为 QMediaPlayer::NoMedia

访问函数：

QMediaPlayer::MediaStatus

mediaStatus () const

通知程序信号：

void	mediaStatusChanged (QMediaPlayer::MediaStatus status )

另请参阅 state .

muted : bool

This property holds the muted state of the current media.

The value will be true if the playback volume is muted; otherwise false.

访问函数：

bool	isMuted () const
void	setMuted (bool muted )

通知程序信号：

void	mutedChanged (bool muted )

playbackRate : qreal

此特性保持当前媒体的回放速率。

This value is a multiplier applied to the media's standard play rate. By default this value is 1.0, indicating that the media is playing at the standard pace. Values higher than 1.0 will increase the rate of play. Values less than zero can be set and indicate the media should rewind at the multiplier of the standard pace.

Not all playback services support change of the playback rate. It is framework defined as to the status and quality of audio and video while fast forwarding or rewinding.

访问函数：

qreal	playbackRate () const
void	setPlaybackRate (qreal rate )

通知程序信号：

void	playbackRateChanged (qreal rate )

playlist : QMediaPlaylist *

This property holds the media playlist being used by the player object.

The player object will use the current playlist item for selection of the content to be played.

By default this property is set to null.

If the media playlist is used as a source, QMediaPlayer::currentMedia is updated with a current playlist item. The current source should be selected with QMediaPlaylist::setCurrentIndex (int) instead of QMediaPlayer::setMedia (), otherwise the current playlist will be discarded.

访问函数：

QMediaPlaylist *	playlist () const
void	setPlaylist (QMediaPlaylist * playlist )

另请参阅 QMediaContent .

位置 : qint64

此特性保持当前媒体的回放位置。

值是当前回放位置，以从媒体开始起的毫秒数表达。将指示位置的周期性变化采用信号 positionChanged ()，可以设置更新间隔采用 QMediaObject 的方法 setNotifyInterval ().

访问函数：

qint64	位置 () const
void	setPosition (qint64 position )

通知程序信号：

void	positionChanged (qint64 position )

seekable : const bool

此特性保持当前媒体的可寻址状态

若支持寻址，此特性为 true；否则为 false。此特性的状态可能改变，当跨存活时间在 QMediaPlayer 对象，使用 seekableChanged 信号以监视改变。

访问函数：

bool	isSeekable () const

通知程序信号：

void	seekableChanged (bool seekable )

state : const State

此特性保持媒体播放器的回放状态。

默认情况下此特性为 QMediaPlayer::Stopped

访问函数：

QMediaPlayer::State

state () const

通知程序信号：

void	stateChanged (QMediaPlayer::State state )

另请参阅 mediaStatus (), play (), pause ()，和 stop ().

videoAvailable : const bool

This property holds the video availability status for the current media.

若可用， QVideoWidget class can be used to view the video. As the life time of QMediaPlayer can be longer than the playback of one QMediaContent , this property may change over time, the videoAvailableChanged signal can be used to monitor it's status.

访问函数：

bool	isVideoAvailable () const

通知程序信号：

void	videoAvailableChanged (bool videoAvailable )

另请参阅 QVideoWidget and QMediaContent .

volume : int

此特性保持当前回放音量。

The playback volume is scaled linearly, ranging from 0 (无声) 到 100 (full volume). Values outside this range will be clamped.

默认情况下，音量为 100 .

UI volume controls should usually be scaled nonlinearly. For example, using a logarithmic scale will produce linear changes in perceived loudness, which is what a user would normally expect from a volume control. See QAudio::convertVolume () 了解更多细节。

访问函数：

int	volume () const
void	setVolume (int volume )

通知程序信号：

void	volumeChanged (int volume )

成员函数文档编制

QMediaPlayer:: QMediaPlayer ( QObject * parent = nullptr, QMediaPlayer::Flags flags = Flags())

构造 QMediaPlayer 实例父级到 parent 和采用 flags .

`[signal]` void QMediaPlayer:: audioAvailableChanged ( bool available )

信号音频内容的可用性已改变成 available .

注意： 通知程序信号对于特性 audioAvailable .

`[signal]` void QMediaPlayer:: audioRoleChanged ( QAudio::Role role )

信号音频 role 为媒体播放器已改变。

注意： 通知程序信号对于特性 audioRole .

该函数在 Qt 5.6 引入。

`[signal]` void QMediaPlayer:: bufferStatusChanged ( int percentFilled )

Signal the amount of the local buffer filled as a percentage by percentFilled .

注意： 通知程序信号对于特性 bufferStatus .

`[signal]` void QMediaPlayer:: currentMediaChanged (const QMediaContent & media )

Signals that the current playing content has been changed to media .

注意： 通知程序信号对于特性 currentMedia .

另请参阅 currentMedia () 和 mediaChanged ().

`[signal]` void QMediaPlayer:: customAudioRoleChanged (const QString & role )

信号音频 role 为媒体播放器已改变。

注意： 通知程序信号对于特性 customAudioRole .

该函数在 Qt 5.11 引入。

`[signal]` void QMediaPlayer:: durationChanged ( qint64 duration )

Signal the duration of the content has changed to duration ，表达 (以毫秒为单位)。

注意： 通知程序信号对于特性 duration .

`[signal]` void QMediaPlayer:: error ( QMediaPlayer::Error error )

Signals that an error 条件已发生。

注意： 信号 error 在此类中被重载。通过使用函数指针句法连接到此信号，Qt 提供用于获得如此范例展示的函数指针的方便帮助程序：

connect(mediaPlayer, QOverload<QMediaPlayer::Error>::of(&QMediaPlayer::error),
    [=](QMediaPlayer::Error error){ /* ... */ });

另请参阅 errorString ().

`[signal]` void QMediaPlayer:: mediaChanged (const QMediaContent & media )

发射信号当媒体源已变为 media .

注意： 通知程序信号对于特性 media .

另请参阅 media () 和 currentMediaChanged ().

`[signal]` void QMediaPlayer:: mediaStatusChanged ( QMediaPlayer::MediaStatus status )

信号 status 若当前媒体已改变。

注意： 通知程序信号对于特性 mediaStatus .

另请参阅 mediaStatus ().

`[signal]` void QMediaPlayer:: mutedChanged ( bool muted )

Signal the mute state has changed to muted .

注意： 通知程序信号对于特性 muted .

`[slot]` void QMediaPlayer:: pause ()

暂停播放当前源。

`[slot]` void QMediaPlayer:: play ()

开始 (或再继续) 播放当前源。

`[signal]` void QMediaPlayer:: playbackRateChanged ( qreal rate )

信号 playbackRate 已改变成 rate .

注意： 通知程序信号对于特性 playbackRate .

`[signal]` void QMediaPlayer:: positionChanged ( qint64 position )

Signal the position of the content has changed to position ，表达 (以毫秒为单位)。

注意： 通知程序信号对于特性 position .

`[signal]` void QMediaPlayer:: seekableChanged ( bool seekable )

信号 seekable 播放器对象状态已改变。

注意： 通知程序信号对于特性 seekable .

`[slot]` void QMediaPlayer:: setMedia (const QMediaContent & media , QIODevice * stream = nullptr)

设置当前 media 源。

若 stream is supplied; media data will be read from it instead of resolving the media source. In this case the url should be provided to resolve additional information about the media such as mime type. The stream must be open and readable. For macOS the stream should be also seekable.

将媒体设为 null QMediaContent will cause the player to discard all information relating to the current media source and to cease all I/O operations related to that media.

注意： This function returns immediately after recording the specified source of the media. It does not wait for the media to finish loading and does not check for errors. Listen for the mediaStatusChanged () 和 error () signals to be notified when the media is loaded and when an error occurs during loading.

从 Qt 5.12.2 起，URL 方案 gst-pipeline provides custom pipelines for the GStreamer backend.

player = new QMediaPlayer;
player->setMedia(QUrl("gst-pipeline: videotestsrc ! autovideosink"));
player->play();

若 QAbstractVideoSurface is used as the video output, qtvideosink can be used as a video sink element directly in the pipeline. After that the surface will receive the video frames in QAbstractVideoSurface::present ().

class Surface : public QAbstractVideoSurface
{
public:
    Surface(QObject *p) : QAbstractVideoSurface(p) { }
    QList<QVideoFrame::PixelFormat> supportedPixelFormats(QAbstractVideoBuffer::HandleType) const override
    {
        // Make sure that the driver supports this pixel format.
        return QList<QVideoFrame::PixelFormat>() << QVideoFrame::Format_YUYV;
    }
    // Video frames are handled here.
    bool present(const QVideoFrame &) override { return true; }
};
player = new QMediaPlayer;
player->setVideoOutput(new Surface(player));
player->setMedia(QUrl("gst-pipeline: videotestsrc ! qtvideosink"));
player->play();

若 QVideoWidget is used as the video output and the pipeline contains a video sink element named qtvideosink , current QVideoWidget will be used to render the video.

player = new QMediaPlayer;
videoWidget = new QVideoWidget;
videoWidget->show();
player->setVideoOutput(videoWidget);
player->setMedia(QUrl("gst-pipeline: videotestsrc ! xvimagesink name=\"qtvideosink\""));
player->play();

If the pipeline contains appsrc element, it will be used to push data from stream .

QImage img("images/qt-logo.png");
img = img.convertToFormat(QImage::Format_ARGB32);
QByteArray ba(reinterpret_cast<const char *>(img.bits()), img.sizeInBytes());
QBuffer buffer(&ba);
buffer.open(QIODevice::ReadOnly);
player = new QMediaPlayer;
player->setMedia(QUrl("gst-pipeline: appsrc blocksize=4294967295 ! \
    video/x-raw,format=BGRx,framerate=30/1,width=200,height=147 ! \
    coloreffects preset=heat ! videoconvert ! video/x-raw,format=I420 ! jpegenc ! rtpjpegpay ! \
    udpsink host=127.0.0.1 port=5000"), &buffer);
player->play();
QMediaPlayer *receiver = new QMediaPlayer;
videoWidget = new QVideoWidget;
receiver->setVideoOutput(videoWidget);
receiver->setMedia(QUrl("gst-pipeline: udpsrc port=5000 ! \
    application/x-rtp,encoding-name=JPEG,payload=26 ! rtpjpegdepay ! jpegdec ! \
    xvimagesink name=qtvideosink"));
receiver->play();
// Content will be shown in this widget.
videoWidget->show();

注意： setter 函数对于特性 media .

另请参阅 media ().

`[signal]` void QMediaPlayer:: stateChanged ( QMediaPlayer::State state )

信号 state 对于播放器对象已改变。

注意： 通知程序信号对于特性 state .

`[slot]` void QMediaPlayer:: stop ()

停止播放，然后将播放位置重置到起始。

`[signal]` void QMediaPlayer:: videoAvailableChanged ( bool videoAvailable )

Signal the availability of visual content has changed to videoAvailable .

注意： 通知程序信号对于特性 videoAvailable .

`[signal]` void QMediaPlayer:: volumeChanged ( int volume )

回放音量信号已改变成 volume .

注意： 通知程序信号对于特性 volume .

`[虚拟]` QMediaPlayer:: ~QMediaPlayer ()

销毁播放器对象。

`[override virtual]` QMultimedia::AvailabilityStatus QMediaPlayer:: availability () const

重实现： QMediaObject::availability () const.

QMediaPlayer::Error QMediaPlayer:: error () const

返回当前错误状态。

`[static]` QMultimedia::SupportEstimate QMediaPlayer:: hasSupport (const QString & mimeType , const QStringList & codecs = QStringList(), QMediaPlayer::Flags flags = Flags())

Returns the level of support a media player has for a mimeType and a set of codecs .

The flags argument allows additional requirements such as performance indicators to be specified.

const QIODevice *QMediaPlayer:: mediaStream () const

返回媒体数据的流源。

This is only valid if a stream was passed to setMedia ().

另请参阅 setMedia ().

void QMediaPlayer:: setVideoOutput ( QVideoWidget * output )

Attach a QVideoWidget video output to the media player.

If the media player has already video output attached, it will be replaced with a new one.

void QMediaPlayer:: setVideoOutput ( QGraphicsVideoItem * output )

Attach a QGraphicsVideoItem video output to the media player.

If the media player has already video output attached, it will be replaced with a new one.

void QMediaPlayer:: setVideoOutput ( QAbstractVideoSurface * surface )

设置视频 surface as the video output of a media player.

If a video output has already been set on the media player the new surface will replace it.

void QMediaPlayer:: setVideoOutput (const QVector < QAbstractVideoSurface > & surfaces* )

Sets multiple video surfaces as the video output of a media player. This allows the media player to render video frames on different surfaces.

All video surfaces must support at least one shared QVideoFrame::PixelFormat .

If a video output has already been set on the media player the new surfaces will replace it.

该函数在 Qt 5.15 引入。

另请参阅 QAbstractVideoSurface::supportedPixelFormats .

QList < QAudio::Role > QMediaPlayer:: supportedAudioRoles () const

返回支持的音频角色列表。

If setting the audio role is not supported, an empty list is returned.

该函数在 Qt 5.6 引入。

另请参阅 audioRole .

QStringList QMediaPlayer:: supportedCustomAudioRoles () const

Returns a list of supported custom audio roles. An empty list may indicate that the supported custom audio roles aren't known. The list may not be complete.

该函数在 Qt 5.11 引入。

另请参阅 customAudioRole .

QMediaPlayer 类

公共类型

特性

公共函数

重实现公共函数

公共槽

信号

静态公共成员

详细描述

成员类型文档编制

enum QMediaPlayer:: Error

enum QMediaPlayer:: Flag flags QMediaPlayer:: Flags

enum QMediaPlayer:: MediaStatus

enum QMediaPlayer:: State

特性文档编制

audioAvailable : const bool

audioRole : QAudio::Role

bufferStatus : const int

currentMedia : const QMediaContent

customAudioRole : QString

duration : const qint64

error : const QString

media : QMediaContent

mediaStatus : const MediaStatus

muted : bool

playbackRate : qreal

playlist : QMediaPlaylist *

位置 : qint64

seekable : const bool

state : const State

videoAvailable : const bool

volume : int

成员函数文档编制

QMediaPlayer:: QMediaPlayer ( QObject * parent = nullptr, QMediaPlayer::Flags flags = Flags())

[signal] void QMediaPlayer:: audioAvailableChanged ( bool available )

[signal] void QMediaPlayer:: audioRoleChanged ( QAudio::Role role )

[signal] void QMediaPlayer:: bufferStatusChanged ( int percentFilled )

[signal] void QMediaPlayer:: currentMediaChanged (const QMediaContent & media )

[signal] void QMediaPlayer:: customAudioRoleChanged (const QString & role )

[signal] void QMediaPlayer:: durationChanged ( qint64 duration )

[signal] void QMediaPlayer:: error ( QMediaPlayer::Error error )

[signal] void QMediaPlayer:: mediaChanged (const QMediaContent & media )

[signal] void QMediaPlayer:: mediaStatusChanged ( QMediaPlayer::MediaStatus status )

[signal] void QMediaPlayer:: mutedChanged ( bool muted )

[slot] void QMediaPlayer:: pause ()

[slot] void QMediaPlayer:: play ()

[signal] void QMediaPlayer:: playbackRateChanged ( qreal rate )

[signal] void QMediaPlayer:: positionChanged ( qint64 position )

[signal] void QMediaPlayer:: seekableChanged ( bool seekable )

[slot] void QMediaPlayer:: setMedia (const QMediaContent & media , QIODevice * stream = nullptr)

[signal] void QMediaPlayer:: stateChanged ( QMediaPlayer::State state )

[slot] void QMediaPlayer:: stop ()

[signal] void QMediaPlayer:: videoAvailableChanged ( bool videoAvailable )

[signal] void QMediaPlayer:: volumeChanged ( int volume )

[虚拟] QMediaPlayer:: ~QMediaPlayer ()

[override virtual] QMultimedia::AvailabilityStatus QMediaPlayer:: availability () const

QMediaPlayer::Error QMediaPlayer:: error () const

[static] QMultimedia::SupportEstimate QMediaPlayer:: hasSupport (const QString & mimeType , const QStringList & codecs = QStringList(), QMediaPlayer::Flags flags = Flags())

const QIODevice *QMediaPlayer:: mediaStream () const

void QMediaPlayer:: setVideoOutput ( QVideoWidget * output )

void QMediaPlayer:: setVideoOutput ( QGraphicsVideoItem * output )

void QMediaPlayer:: setVideoOutput ( QAbstractVideoSurface * surface )

void QMediaPlayer:: setVideoOutput (const QVector < QAbstractVideoSurface *> & surfaces )

QList < QAudio::Role > QMediaPlayer:: supportedAudioRoles () const

QStringList QMediaPlayer:: supportedCustomAudioRoles () const

内容

enum QMediaPlayer:: Flag
flags QMediaPlayer:: Flags

`[signal]` void QMediaPlayer:: audioAvailableChanged ( bool available )

`[signal]` void QMediaPlayer:: audioRoleChanged ( QAudio::Role role )

`[signal]` void QMediaPlayer:: bufferStatusChanged ( int percentFilled )

`[signal]` void QMediaPlayer:: currentMediaChanged (const QMediaContent & media )

`[signal]` void QMediaPlayer:: customAudioRoleChanged (const QString & role )

`[signal]` void QMediaPlayer:: durationChanged ( qint64 duration )

`[signal]` void QMediaPlayer:: error ( QMediaPlayer::Error error )

`[signal]` void QMediaPlayer:: mediaChanged (const QMediaContent & media )

`[signal]` void QMediaPlayer:: mediaStatusChanged ( QMediaPlayer::MediaStatus status )

`[signal]` void QMediaPlayer:: mutedChanged ( bool muted )

`[slot]` void QMediaPlayer:: pause ()

`[slot]` void QMediaPlayer:: play ()

`[signal]` void QMediaPlayer:: playbackRateChanged ( qreal rate )

`[signal]` void QMediaPlayer:: positionChanged ( qint64 position )

`[signal]` void QMediaPlayer:: seekableChanged ( bool seekable )

`[slot]` void QMediaPlayer:: setMedia (const QMediaContent & media , QIODevice * stream = nullptr)

`[signal]` void QMediaPlayer:: stateChanged ( QMediaPlayer::State state )

`[slot]` void QMediaPlayer:: stop ()

`[signal]` void QMediaPlayer:: videoAvailableChanged ( bool videoAvailable )

`[signal]` void QMediaPlayer:: volumeChanged ( int volume )

`[虚拟]` QMediaPlayer:: ~QMediaPlayer ()

`[override virtual]` QMultimedia::AvailabilityStatus QMediaPlayer:: availability () const

`[static]` QMultimedia::SupportEstimate QMediaPlayer:: hasSupport (const QString & mimeType , const QStringList & codecs = QStringList(), QMediaPlayer::Flags flags = Flags())

void QMediaPlayer:: setVideoOutput (const QVector < QAbstractVideoSurface > & surfaces* )