如何解析返回空的DefaultTrackSelector#getCurrentMappedTrackInfo？
如何解析返回空的DefaultTrackSelector#getCurrentMappedTrackInfo？
提问于 2020-02-06 13:31:59
我使用的是Exoplayer版本的2.7.2，我想在MappedTrackInfo上迭代以获得一个DASH视频的所有可用TrackGroupArray。但是DefaultTrackSelector#getCurrentMappedTrackInfo返回null。
这是我的密码：
PlayerTrackSelector.kt
class PlayerTrackSelector : TrackSelection.Factory {
override fun createTrackSelection(
group: TrackGroup?,
bandwidthMeter: BandwidthMeter?,
vararg tracks: Int
): TrackSelection {
return AdaptiveTrackSelection(
group!!, tracks,bandwidthMeter,
AdaptiveTrackSelection.DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS.toLong(),
AdaptiveTrackSelection.DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS.toLong(),
AdaptiveTrackSelection.DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS.toLong(),
AdaptiveTrackSelection.DEFAULT_BANDWIDTH_FRACTION,
AdaptiveTrackSelection.DEFAULT_BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE,
AdaptiveTrackSelection.DEFAULT_MIN_TIME_BETWEEN_BUFFER_REEVALUTATION_MS,
Clock.DEFAULT
)
}
}MainActivity.kt
logTracks(DefualtTrackSelector(PlayerTrackSelector())) // This is called after Player#prepare
private fun logTracks(trackSelector: DefaultTrackSelector?) {
var trackGroupArray: TrackGroupArray? = null
val mappedTrackInfo = trackSelector!!.currentMappedTrackInfo
if(mappedTrackInfo != null) {
if (mappedTrackInfo!!.rendererCount != 0) {
for (i in 0 until mappedTrackInfo.rendererCount) {
if (mappedTrackInfo.getTrackGroups(i) != null) {
val tempTrackGroupArray = mappedTrackInfo.getTrackGroups(i)
if (tempTrackGroupArray.length != 0 && player!!.getRendererType(i) == C.TRACK_TYPE_VIDEO) {
trackGroupArray = tempTrackGroupArray
}
} else {
Log.d(TAG, "Null, MappedTrackInfo#getTrackGroups(index)")
}
}
for (i in 0 until trackGroupArray!!.length) {
val trackGroup = trackGroupArray.get(i)
for (j in 0 until trackGroup.length) {
val format = trackGroup.getFormat(j)
Log.d(TAG,"Height = ${format.height} GroupIndex = $i TrackIndex = $j")
}
}
} else {
Log.d(TAG, "Empty, MappedTrackInfo#renderCount")
}
}else{
Log.d(TAG, "Null, MappedTrackInfo") //This is what shows in logcat.
}
}我也尝试过不同的MPD。
信息：
1)属地：
实现'com.google.android.exoplayer:exoplayer:2.7.2‘
实现'com.google.android.exoplayer:exoplayer-core:2.10.5‘
实现'com.google.android.exoplayer:exoplayer-dash:2.10.5‘
实现'com.google.android.exoplayer:exoplayer-ui:2.10.5‘
2)网址：https://s3.amazonaws.com/_bc_dml/example-content/sintel_dash/sintel_vod.mpd
回答 1
Stack Overflow用户
发布于 2020-02-06 15:59:03
您需要添加Player.EventListener并等待playbackState位于Player.STATE_READY
private val eventListener: Player.EventListener = object : Player.EventListener {
override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
if (playbackState == Player.STATE_READY) {
// look for MappedTrackInfo
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60096164
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