版本：

webrtc M59

收包流程：

AsyncUDPSocket::OnReadEvent

AllocationSequence::OnReadPacket

HandleIncomingPacket

UDPPort::OnReadPacket

Connection::OnReadPacket

P2PTransportChannel::OnReadPacke

SignalReadPacket

BaseChannel::OnPacketRead

BaseChannel::HandlePacket(該接口內的WantsPacket會判斷rtp包的payload type是否在std::set<int> payload_types_集合內，不在的話不會處理)

BaseChannel::OnPacketReceived

WebRtcVoiceMediaChannel::OnPacketReceived

PacketReceiver::DeliveryStatus Call::DeliverRtp

AudioReceiveStream::OnRtpPacket（video通話為VideoReceiveStream::OnRtpPacket）

Channel::OnRtpPacket

Channel::ReceivePacket

RtpReceiverImpl::IncomingRtpPacket

?NetEqImpl::InsertPacket

NetEqImpl::InsertPacketInternal

語音流程：

WebRtcVoiceMediaChannel::OnPacketReceived

?AudioReceiveStream::OnRtpPacket

ChannelProxy::OnRtpPacket

?Channel::OnRtpPacket

Channel::ReceivePacket

RtpReceiverImpl::IncomingRtpPacket

RTPReceiverAudio::ParseAudioCodecSpecific

Channel::OnReceivedPayloadData

AudioCodingModuleImpl::IncomingPacket

AcmReceiver::InsertPacket

ps：可參考http://www.it610.com/article/5250159.htm

視頻收包流程：

WebRtcVideoChannel2::OnPacketReceived

PacketReceiver::DeliveryStatus Call::DeliverRtp

RtpStreamReceiver::ReceivePacket

RtpReceiverImpl::IncomingRtpPacket

RTPReceiverVideo::ParseRtpPacket

RtpStreamReceiver::OnReceivedPayloadData

PacketBuffer::InsertPacket（組幀）

?RtpStreamReceiver::OnReceivedFrame（檢查是否需要請求關鍵幀、再查找幀的參考關系是否滿足）

void RtpFrameReferenceFinder::ManageFrame

void RtpFrameReferenceFinder::ManageFrameGeneric

VideoReceiveStream::OnCompleteFrame

FrameBuffer::InsertFrame (將幀插入到jitter buffter至此數據包的接收和處理已經完成）

?

視頻解碼流程：

VideoReceiveStream::VideoReceiveStream（創建解碼線程在該構造函數里面，調用VideoReceiveStream::DecodeThreadFunction）

VideoReceiveStream::Decode（ 如果有幀才會去解碼，最長等待3秒，在VideoReceiveStream::Decode中有設置等待時間）

FrameBuffer::ReturnReason FrameBuffer::NextFrame (獲取幀)

VideoReceiver::Decode

VCMGenericDecoder* VCMCodecDataBase::GetDecoder（獲取解碼，如果沒有創建則調用）

CreateAndInitDecoder(硬解的話走的是External codec流程也就是new VCMGenericDecoder(external_dec_item->external_decoder_instance, true)）

VCMGenericDecoder::InitDecode

MediaCodecVideoDecoder::InitDecode

MediaCodecVideoDecoder::InitDecodeOnCodecThread()

VCMDecodedFrameCallback::Decoded（解碼完成）

VideoStreamDecoder::FrameToRender（收到解碼后的數據）

IncomingVideoStream::OnFrame? ?（將幀放入隊列VideoRenderFrames（incoming_video_stream_接收解碼對象通過VideoStreamDecoder::VideoStreamDecoder ->VideoReceiver::RegisterReceiveCallback(this)–>VCMDecodedFrameCallback::SetUserReceiveCallback）

IncomingVideoStream::Dequeue

?

?

ps: 這個只是一部分，其余的后續補充

?

轉載于:https://my.oschina.net/xgcode/blog/2120620

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