MediaPlayerSourceObserver

onAudioVolumeIndication

Reports the volume of the media player.

final void Function(int volume)? onAudioVolumeIndication;

The SDK triggers this callback every 200 milliseconds to report the current volume of the media player.

Parameters

volume: The volume of the media player. The value ranges from 0 to 255.

onMetaData

Occurs when the media metadata is received.

final void Function(Uint8List data, int length)? onMetaData;

The callback occurs when the player receives the media metadata and reports the detailed information of the media metadata.

Parameters

data: The detailed data of the media metadata.
length: The data length (bytes).

onPlayBufferUpdated

Reports the playback duration that the buffered data can support.

final void Function(int playCachedBuffer)? onPlayBufferUpdated;

When playing online media resources, the SDK triggers this callback every two seconds to report the playback duration that the currently buffered data can support.

When the playback duration supported by the buffered data is less than the threshold (0 by default), the SDK returns playerEventBufferLow (6).
When the playback duration supported by the buffered data is greater than the threshold (0 by default), the SDK returns playerEventBufferRecover (7).

Parameters

playCachedBuffer: The playback duration (ms) that the buffered data can support.

onPlayerCacheStats

Reports the statistics of the media file being cached.

final void Function(CacheStatistics stats)? onPlayerCacheStats;

Details

After you call the openWithMediaSource method and set enableCache as true, the SDK triggers this callback once per second to report the statistics of the media file being cached.

Parameters

stats: The statistics of the media file being cached. See CacheStatistics.

onPlayerEvent

Reports the player events.

final void Function(
          MediaPlayerEvent eventCode, int elapsedTime, String message)?
      onPlayerEvent;

After calling the seek method, the SDK triggers the callback to report the results of the seek operation.

Parameters

eventCode: The player event. See MediaPlayerEvent.
elapsedTime: The time (ms) when the event occurs.
message: Information about the event.

onPlayerInfoUpdated

Occurs when information related to the media player changes.

final void Function(PlayerUpdatedInfo info)? onPlayerInfoUpdated;

When the information about the media player changes, the SDK triggers this callback. You can use this callback for troubleshooting.

Parameters

info: Information related to the media player. See PlayerUpdatedInfo.

onPlayerPlaybackStats

The statistics of the media file being played.

final void Function(PlayerPlaybackStats stats)? onPlayerPlaybackStats;

Details

The SDK triggers this callback once per second to report the statistics of the media file being played.

Parameters

stats: The statistics of the media file. See PlayerPlaybackStats.

onPlayerSourceStateChanged

Reports the changes of playback state.

final void Function(MediaPlayerState state, MediaPlayerReason reason)?
    onPlayerSourceStateChanged;

When the state of the media player changes, the SDK triggers this callback to report the current playback state.

Parameters

state: The playback state. See MediaPlayerState.
reason: The reason for the changes in the media player status. See MediaPlayerReason.

onPlayerSrcInfoChanged

Occurs when the video bitrate of the media resource changes.

final void Function(SrcInfo from, SrcInfo to)? onPlayerSrcInfoChanged;

Parameters

from: Information about the video bitrate of the media resource being played. See SrcInfo.
to: Information about the changed video bitrate of media resource being played. See SrcInfo.

onPositionChanged

Reports the playback progress of the media file.

final void Function(int position)? onPositionChanged;

When playing media files, the SDK triggers this callback every two second to report current playback progress.

Parameters

positionMs: The playback position (ms) of media files.
timeStampMs: The NTP timestamp (ms) of the current playback progress.

onPreloadEvent

Reports the events of preloaded media resources.

final void Function(String src, PlayerPreloadEvent event)? onPreloadEvent;

Parameters

src: The URL of the media resource.
event: Events that occur when media resources are preloaded. See PlayerPreloadEvent.