4.ExoPlayer源码分析之prepare序列图

上面源码分析完了后，发现一脸懵逼，只是简单的知道了怎么调用的，都是啥，但是并不知道每个类具体是干啥的，以及他们之间的关联关系

SimpleExoPlayer->ExoPlayerImpl: player.prepare(mediaSource)
ExoPlayerImpl->ExoPlayerImplInternal: internalPlayer.prepare(mediaSource)
ExoPlayerImplInternal->ExoPlayerImplInternal: MSG_PREPARE
ExoPlayerImplInternal->ExoPlayerImplInternal: prepareInternal
ExoPlayerImplInternal->MediaSource: mediaSource.prepareSource()
ExoPlayerImplInternal->ExoPlayerImplInternal: DO_SOME_WORK
ExoPlayerImplInternal->MediaPeriodQueue: doSomeWork()
ExoPlayerImplInternal->Renderer: renderer.render()
MediaPeriodQueue->MediaPeriodHolder: queue.getPlayingPeriod()
MediaPeriodHolder->MediaPeriod: createMediaPeriod()
ExoPlayerImplInternal->MediaPeriod: doSomeWork(updatePeriods())
MediaPeriod->ExtractingLoadable: prepare()
ExtractingLoadable->DataSource: load()
ExtractingLoadable->Extracotr(Mp4Extractor): load()
Extracotr(Mp4Extractor)->Extracotr(Mp4Extractor): readAtomHeader() processAtomEnded()processMoovAtom
Extracotr(Mp4Extractor)->ProgressiveMediaPeriod: endTracks()
ProgressiveMediaPeriod->ExoPlayerImplInternal: onPrepared(MediaPeriod source)
ExoPlayerImplInternal->ExoPlayerImplInternal: handlePeriodPrepared
ExoPlayerImplInternal->Renderer: enableRenderer
Renderer->Renderer: if (isPlaying) {renderer.start()}

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