Android-7.0-Nuplayer-启动流程

2019-11-07 23:32:21

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Nuplayer为异步架构，随处可见的AMessage看代码着实头大，以下为个人总结，供大家参考，如有错误不吝赐教。

Nuplayer简介

Android2.3时引入流媒体框架，而流媒体框架的核心是NuPlayer。Android4.0之后HttpLive和RTSP协议开始使用NuPlayer播放器，Android5.0（L版本）之后本地播放也开始使用NuPlayer播放器。

启动Nuplayer

发送kWhatStart消息即可启动player启动Decoder之后是一直polling input buffer

Start流程

ConfigDecoder流程

初始化Decoder ACodec OMX将Output Buffer塞给OMX填充Input Buffer

ConfigDecoder流程

Input-Output Buffer流程

将Input Buffer送给OMX，并再次填充将Output Buffer设置给OMX，并取得解码后的data见解码后的data送给Render做AV同步

Input-Output Buffer流程

完整序列图

Start流程

完整序列图源码

打开Web Sequence Diagrams网址，直接粘贴进去即可。

Title Start流程participant NuPlayerDriverparticipant NuPlayerparticipant DecoderBaseparticipant Decoderparticipant MediaCodecparticipant ACodecparticipant BaseStateparticipant UninitializedStateparticipant LoadedStateparticipant LoadedToIdleStateparticipant IdleToExecutingStateparticipant ExecutingStateparticipant OMXopt Start NuPlayerDriver->+NuPlayer: start() NuPlayer-->NuPlayer: kWhatStart NuPlayer-->-NuPlayerDriver: NuPlayer->+NuPlayer: onStart() NuPlayer->+DecoderBase: setRenderer() DecoderBase-->DecoderBase: kWhatSetRenderer DecoderBase-->-NuPlayer: NuPlayer->NuPlayer: postScanSources() NuPlayer-->-NuPlayer: kWhatScanSourcesend opt Polling InputBuffer DecoderBase->+Decoder: onSetRenderer() loop Decoder->DecoderBase: onRequestInputBuffers() DecoderBase->Decoder: doRequestBuffers() Decoder->Decoder: fetchInputData() Decoder->Decoder: onInputBufferFetched() Decoder-->DecoderBase: kWhatRequestInputBuffers end Decoder-->-DecoderBase:endopt ConfigDecoder NuPlayer->+NuPlayer: instantiateDecoder() NuPlayer->+DecoderBase: init() DecoderBase-->-NuPlayer: NuPlayer->+DecoderBase: configure() DecoderBase-->DecoderBase: kWhatConfigure DecoderBase-->-NuPlayer: NuPlayer-->-NuPlayer: DecoderBase->+Decoder: onConfigure() Decoder->+MediaCodec: CreateByType() MediaCodec->MediaCodec: init() MediaCodec-->MediaCodec: kWhatInit MediaCodec-->-Decoder: MediaCodec->+ACodec: initiateAllocateComponent ACodec-->ACodec:kWhatAllocateComponent ACodec-->-MediaCodec: ACodec->+UninitializedState: onAllocateComponent() UninitializedState->+OMX: allocateNode() OMX-->-UninitializedState: UninitializedState->+LoadedState: stateEntered() LoadedState-->-UninitializedState: UninitializedState-->-ACodec: Decoder->+MediaCodec: configure() MediaCodec-->MediaCodec: kWhatConfigure MediaCodec-->-Decoder: MediaCodec->+ACodec:initiateConfigureComponent() ACodec-->ACodec: kWhatConfigureComponent ACodec-->-MediaCodec: ACodec->+LoadedState: onConfigureComponent() LoadedState->-ACodec: configureCodec() Decoder->+MediaCodec: setCallback() MediaCodec-->-Decoder: Decoder->+MediaCodec: start() MediaCodec-->MediaCodec: kWhatStart MediaCodec->+ACodec: initiateStart() ACodec-->ACodec: kWhatStart ACodec-->-MediaCodec: MediaCodec-->-Decoder: Decoder-->-DecoderBase: ACodec->+LoadedState: onStart() LoadedState-->OMX: sendCommand(OMX_StateIdle) LoadedState->+LoadedToIdleState: stateEntered() LoadedToIdleState->LoadedToIdleState: allocateBuffers() LoadedToIdleState->+ACodec: allocateBuffersOnPort() ACodec-->-LoadedToIdleState: LoadedToIdleState-->-LoadedState: LoadedState-->-ACodec: OMX-->+LoadedToIdleState: OMX_EventCmdComplete LoadedToIdleState-->OMX: sendCommand(OMX_StateExecuting) LoadedToIdleState->+IdleToExecutingState: stateEntered() IdleToExecutingState-->-LoadedToIdleState: LoadedToIdleState-->-OMX: OMX-->+IdleToExecutingState: OMX_EventCmdComplete IdleToExecutingState->+ExecutingState: resume() ExecutingState->ExecutingState: submitOutputBuffers() ExecutingState->ExecutingState: submitRegularOutputBuffers ExecutingState-->OMX: fillBuffer() ExecutingState-->BaseState: postFillThisBuffer() IdleToExecutingState->ExecutingState: stateEntered() ExecutingState-->-IdleToExecutingState: IdleToExecutingState-->-OMX:endloop InputBuffer OMX-->+BaseState: omx_message::EMPTY_BUFFER_DONE BaseState->BaseState: onOMXEmptyBufferDone() BaseState->BaseState: postFillThisBuffer() BaseState-->MediaCodec: CodecBase::kWhatFillThisBuffer BaseState-->-OMX: MediaCodec->+MediaCodec: onInputBufferAvailable() MediaCodec-->-Decoder: MediaCodec::CB_INPUT_AVAILABLE Decoder->+Decoder: handleAnInputBuffer() Decoder->Decoder: onInputBufferFetched() Decoder->+MediaCodec: queueInputBuffer() MediaCodec-->MediaCodec: kWhatQueueInputBuffer MediaCodec-->-Decoder: Decoder-->-DecoderBase: onRequestInputBuffers() MediaCodec->+MediaCodec: onQueueInputBuffer() MediaCodec-->-BaseState: kWhatInputBufferFilled BaseState->+BaseState: onInputBufferFilled() BaseState-->-OMX: emptyBuffer()endloop OutputBuffer OMX-->+BaseState: omx_message::FILL_BUFFER_DONE BaseState->BaseState: onOMXEmptyBufferDone() BaseState-->MediaCodec: CodecBase::kWhatDrainThisBuffer BaseState-->-OMX: MediaCodec->+MediaCodec:updateBuffers MediaCodec->MediaCodec: onOutputBufferAvailable() MediaCodec-->-Decoder: MediaCodec::CB_OUTPUT_AVAILABLE Decoder->+Decoder: handleAnOutputBuffer() Decoder->Decoder: onRenderBuffer() Decoder->-MediaCodec: renderOutputBufferAndRelease() MediaCodec-->MediaCodec: kWhatReleaSEOutputBuffer MediaCodec->+MediaCodec: onReleaseOutputBuffer() MediaCodec-->-BaseState: kWhatOutputBufferDrained BaseState->+BaseState: onOutputBufferDrained() BaseState-->-OMX: fillBuffer()end

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