How to set defaultPositionUs of a Window in the Timeline?

[akshdeep-singh]

How to set defaultPositionUs of a Window in the Timeline?

[akshdeep-singh]

I got a solution based on this google/ExoPlayer#9122 (comment):

class MyMediaSource(mediaSource: MediaSource, private val startPositionMs: Long): WrappingMediaSource(mediaSource) {
    override fun onChildSourceInfoRefreshed(newTimeline: Timeline) {
        super.onChildSourceInfoRefreshed(MyTimeline(newTimeline, startPositionMs))
    }

    class MyTimeline(timeline: Timeline, private val startPositionMs: Long): ForwardingTimeline(timeline) {
        override fun getWindow(windowIndex: Int, window: Window, defaultPositionProjectionUs: Long): Window {
            return super.getWindow(windowIndex, window, defaultPositionProjectionUs).apply {
                defaultPositionUs = Util.msToUs(startPositionMs)
            }
        }
    }
}

val defaultMediaSourceFactory = DefaultMediaSourceFactory(this)
val mediaSourceFactory = object : MediaSource.Factory {
    override fun setDrmSessionManagerProvider(drmSessionManagerProvider: DrmSessionManagerProvider): MediaSource.Factory {
        return defaultMediaSourceFactory.setDrmSessionManagerProvider(drmSessionManagerProvider)
    }

    override fun setLoadErrorHandlingPolicy(loadErrorHandlingPolicy: LoadErrorHandlingPolicy): MediaSource.Factory {
        return defaultMediaSourceFactory.setLoadErrorHandlingPolicy(loadErrorHandlingPolicy)
    }

    override fun getSupportedTypes(): IntArray {
        return defaultMediaSourceFactory.supportedTypes
    }

    override fun createMediaSource(mediaItem: MediaItem): MediaSource {
        return MyMediaSource(
            defaultMediaSourceFactory.createMediaSource(mediaItem),
            mediaItem.mediaMetadata.extras?.getLong("startPositionMs") ?: 0,
        )
    }
}

player = ExoPlayer.Builder(this)
    .setMediaSourceFactory(mediaSourceFactory)
    .build()

[marcbaechinger]

I think you can do this only if you own the media. This is AFAIK used with live streams.

The feature request for VOD is a duplicate of #6373 and #1041 I think.

You can use MediaItem.ClippingProperties to clip a media item. However, this removes the part before the clipping start position. A user can't seek back beyond this because it's clipped. So this isn't exactly the same as a start position but about the same as a default position. :)

If this isn't helpful you need to use a seek for this. This was discussed in #1041