MediaStreamSource.SampleRequested 事件

  • 参考

定义

命名空间:
Windows.Media.Core
编辑

当 MediaStreamSource 请求指定流的 MediaStreamSample 时发生。

// Register
event_token SampleRequested(TypedEventHandler<MediaStreamSource, MediaStreamSourceSampleRequestedEventArgs const&> const& handler) const;

// Revoke with event_token
void SampleRequested(event_token const* cookie) const;

// Revoke with event_revoker
MediaStreamSource::SampleRequested_revoker SampleRequested(auto_revoke_t, TypedEventHandler<MediaStreamSource, MediaStreamSourceSampleRequestedEventArgs const&> const& handler) const;
public event TypedEventHandler<MediaStreamSource,MediaStreamSourceSampleRequestedEventArgs> SampleRequested;
function onSampleRequested(eventArgs) { /* Your code */ }
mediaStreamSource.addEventListener("samplerequested", onSampleRequested);
mediaStreamSource.removeEventListener("samplerequested", onSampleRequested);
- or -
mediaStreamSource.onsamplerequested = onSampleRequested;
Public Custom Event SampleRequested As TypedEventHandler(Of MediaStreamSource, MediaStreamSourceSampleRequestedEventArgs)

事件类型

TypedEventHandler<MediaStreamSource,MediaStreamSourceSampleRequestedEventArgs>

注解

收到此事件后，应用程序应向 MediaStreamSourceSampleRequest 对象的 Sample 属性分配请求流的 MediaStreamSample。

如果应用程序暂时无法传递 MediaStreamSample，它应获取 MediaStreamSourceSampleRequestDeferral 对象并定期调用 ReportSampleProgress，直到它将 MediaStreamSample 分配给 Sample 属性，并在 MediaStreamSourceSampleRequestDeferral 对象上调用 Complete。 每次调用 ReportSampleProgress 之间的建议间隔为 500 毫秒。

如果指定的流没有更多示例，则应用程序应取消分配 Sample 属性或将其设置为 null。

适用于

另请参阅