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

ConfigDecoder流程

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

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

完整序列图

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 NuPlayerDriver
participant NuPlayer
participant DecoderBase
participant Decoder
participant MediaCodec
participant ACodec
participant BaseState
participant UninitializedState
participant LoadedState
participant LoadedToIdleState
participant IdleToExecutingState
participant ExecutingState
participant OMXopt StartNuPlayerDriver->+NuPlayer: start()NuPlayer-->NuPlayer: kWhatStartNuPlayer-->-NuPlayerDriver:NuPlayer->+NuPlayer: onStart()NuPlayer->+DecoderBase: setRenderer()DecoderBase-->DecoderBase: kWhatSetRendererDecoderBase-->-NuPlayer: NuPlayer->NuPlayer: postScanSources()NuPlayer-->-NuPlayer: kWhatScanSources
end opt Polling InputBufferDecoderBase->+Decoder: onSetRenderer()loop Decoder->DecoderBase: onRequestInputBuffers()DecoderBase->Decoder: doRequestBuffers()Decoder->Decoder: fetchInputData()Decoder->Decoder: onInputBufferFetched()Decoder-->DecoderBase: kWhatRequestInputBuffersendDecoder-->-DecoderBase:
endopt ConfigDecoderNuPlayer->+NuPlayer: instantiateDecoder()NuPlayer->+DecoderBase: init()DecoderBase-->-NuPlayer:NuPlayer->+DecoderBase: configure()DecoderBase-->DecoderBase: kWhatConfigureDecoderBase-->-NuPlayer: NuPlayer-->-NuPlayer:DecoderBase->+Decoder: onConfigure()Decoder->+MediaCodec: CreateByType()MediaCodec->MediaCodec: init()MediaCodec-->MediaCodec: kWhatInitMediaCodec-->-Decoder:MediaCodec->+ACodec: initiateAllocateComponentACodec-->ACodec:kWhatAllocateComponentACodec-->-MediaCodec: ACodec->+UninitializedState: onAllocateComponent()UninitializedState->+OMX: allocateNode()OMX-->-UninitializedState: UninitializedState->+LoadedState: stateEntered()LoadedState-->-UninitializedState: UninitializedState-->-ACodec: Decoder->+MediaCodec: configure()MediaCodec-->MediaCodec: kWhatConfigureMediaCodec-->-Decoder: MediaCodec->+ACodec:initiateConfigureComponent()ACodec-->ACodec: kWhatConfigureComponentACodec-->-MediaCodec:ACodec->+LoadedState: onConfigureComponent()LoadedState->-ACodec: configureCodec()Decoder->+MediaCodec: setCallback()MediaCodec-->-Decoder: Decoder->+MediaCodec: start()MediaCodec-->MediaCodec: kWhatStartMediaCodec->+ACodec: initiateStart()ACodec-->ACodec: kWhatStartACodec-->-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_EventCmdCompleteLoadedToIdleState-->OMX: sendCommand(OMX_StateExecuting)LoadedToIdleState->+IdleToExecutingState: stateEntered()IdleToExecutingState-->-LoadedToIdleState:LoadedToIdleState-->-OMX:OMX-->+IdleToExecutingState: OMX_EventCmdCompleteIdleToExecutingState->+ExecutingState: resume()ExecutingState->ExecutingState: submitOutputBuffers()ExecutingState->ExecutingState: submitRegularOutputBuffersExecutingState-->OMX: fillBuffer()ExecutingState-->BaseState: postFillThisBuffer()IdleToExecutingState->ExecutingState: stateEntered()ExecutingState-->-IdleToExecutingState:IdleToExecutingState-->-OMX:
endloop InputBufferOMX-->+BaseState: omx_message::EMPTY_BUFFER_DONEBaseState->BaseState: onOMXEmptyBufferDone()BaseState->BaseState: postFillThisBuffer()BaseState-->MediaCodec: CodecBase::kWhatFillThisBufferBaseState-->-OMX:MediaCodec->+MediaCodec: onInputBufferAvailable()MediaCodec-->-Decoder: MediaCodec::CB_INPUT_AVAILABLEDecoder->+Decoder: handleAnInputBuffer()Decoder->Decoder: onInputBufferFetched()Decoder->+MediaCodec: queueInputBuffer()MediaCodec-->MediaCodec: kWhatQueueInputBufferMediaCodec-->-Decoder:Decoder-->-DecoderBase: onRequestInputBuffers()MediaCodec->+MediaCodec: onQueueInputBuffer()MediaCodec-->-BaseState: kWhatInputBufferFilledBaseState->+BaseState: onInputBufferFilled()BaseState-->-OMX: emptyBuffer()
endloop OutputBufferOMX-->+BaseState: omx_message::FILL_BUFFER_DONEBaseState->BaseState: onOMXEmptyBufferDone()BaseState-->MediaCodec: CodecBase::kWhatDrainThisBufferBaseState-->-OMX:MediaCodec->+MediaCodec:updateBuffersMediaCodec->MediaCodec: onOutputBufferAvailable()MediaCodec-->-Decoder: MediaCodec::CB_OUTPUT_AVAILABLEDecoder->+Decoder: handleAnOutputBuffer()Decoder->Decoder: onRenderBuffer()Decoder->-MediaCodec: renderOutputBufferAndRelease()MediaCodec-->MediaCodec: kWhatReleaseOutputBufferMediaCodec->+MediaCodec: onReleaseOutputBuffer()MediaCodec-->-BaseState: kWhatOutputBufferDrainedBaseState->+BaseState: onOutputBufferDrained()BaseState-->-OMX: fillBuffer()
end

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Android-7.0-Nuplayer-启动流程

Nuplayer简介

启动Nuplayer

ConfigDecoder流程

Input-Output Buffer流程

完整序列图

完整序列图源码

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