WebRTC 源码分析 (四) Android 、IOS 、Windows 端视频数据流程分析

DevYK2023-08-29 16:25

1. 简介

该篇文章主要针对在 (IOS、Android、Windows)平台上的视频数据的流程，只有当我们熟悉了这些流程后，才能快速针对性的去看某块代码。下面是一个简要的流程图，我们根据这个流程图然后来分析。

环境:

  • webrtc: m98
  • Android / IOS 编解码：MediaCodec / VideoToolBox
  • Windows 编解码：OpenH264 / FFmpeg H264
  • Android / IOS / Windows 渲染：OpenGL ES / Metal / StretchDIBits

引用李超老师的一张数据流程图:

建议阅读顺序:

第一种方式:

  • IOS 阅读的话，可以参考 #? 序号，其它平台参考 IOS 阅读的顺序即可

第二种方式:

  • 平台采集 -> 公共编码 -> 平台编码 -> 公共编码 -> 封包 -> 发送->接收 -> 解包 -> 公共解码 -> 平台解码

    -> 公共解码 -> 平台渲染

2. 发送

2.1 采集

2.1.1 IOS

tex 复制代码 
#8	webrtc::ObjCVideoTrackSource::OnCapturedFrame(RTCVideoFrame*) at webrtc/sdk/objc/native/src/objc_video_track_source.mm:124
#7	[RTCVideoSource capturer:didCaptureVideoFrame:] at webrtc/sdk/objc/api/peerconnection/RTCVideoSource.mm:79
#6	[RTCCameraVideoCapturer captureOutput:didOutputSampleBuffer:fromConnection:] at webrtc/sdk/objc/components/capturer/RTCCameraVideoCapturer.m:299
#5	[videoDataOutput setSampleBufferDelegate:self queue:self.frameQueue];
#4	[RTCCameraVideoCapturer setupVideoDataOutput] at webrtc/sdk/objc/components/capturer/RTCCameraVideoCapturer.m:455
#3	[RTCCameraVideoCapturer setupCaptureSession:] at webrtc/sdk/objc/components/capturer/RTCCameraVideoCapturer.m:438
#2	[RTCCameraVideoCapturer initWithDelegate:captureSession:] at webrtc/sdk/objc/components/capturer/RTCCameraVideoCapturer.m:73
#1	[RTCCameraVideoCapturer initWithDelegate:] at webrtc/sdk/objc/components/capturer/RTCCameraVideoCapturer.m:62

2.1.2 Android

makefile 复制代码 
########################### jni ###########################
webrtc::jni::AndroidVideoTrackSource::OnFrameCaptured
->android_video_track_source.cc:129
Java_org_webrtc_NativeAndroidVideoTrackSource_nativeOnFrameCaptured
->NativeAndroidVideoTrackSource_jni.h:109
########################### java ###########################
onFrameCaptured:58, NativeAndroidVideoTrackSource.java
nativeAndroidVideoTrackSource.onFrameCaptured(adaptedFrame):73, VideoSource.java
onFrameCaptured:62, VideoSource.java
onFrameCaptured:155, CameraCapture.java
events.onFrameCaptured:207, Camera2Session.java
listener.onFrame(frame):384, SurfaceTextureHelper.java
tryDeliverTextureFrame:207, SurfaceTextureHelper.java
capturer.startCapture(videoWidth, videoHeight, videoFps):960, PeerConnectionClient.java
setOnFrameAvailableListener:201, SurfaceTextureHelper.java
new SurfaceTextureHelper:75, SurfaceTextureHelper.java
create:64, SurfaceTextureHelper.java
create:92, SurfaceTextureHelper.java
SurfaceTextureHelper.create: SurfaceTextureHelper.java
createVideoTrack:957, PeerConnectionClient.java

2.1.3 Windows

rust 复制代码 
TestVideoCapturer::OnFrame(const VideoFrame& original_frame) test_video_captureer.cc 62
VcmCapturer::OnFrame(const VideoFrame& frame) vcm_capturer.cc 94
VideoCaptureImpl::DeliverCapturedFrame(VideoFrame& captureFrame) video_capture_impl.cc 107
VideoCaptureImpl::IncomingFrame  video_capture_impl.cc 117
CaptureSinkFilter::ProcessCapturedFrame sink_filter_ds.cc 916
CaptureInputPin::Receive(IMediaSample* media_sample) sink_filter_ds.cc 732

VideoCaptureDS::StartCapture(const VideoCaptureCapability& capability) video_capture_ds.cc 132
vcm_->StartCapture(capability_)  vcm_capturer.cc 55
VideoCaptureDS::Init(const char* deviceUniqueIdUTF8) video_capture_ds.cc 58
VideoCaptureImpl::Create video_capture_factory_windows.cc 31
VideoCaptureFactory::Create video_capture_factory.cc 22
VcmCapturer::Init vcm_capturer.cc 42
VcmCapturer::Create vcm_capturer.cc 70
CapturerTrackSource::Create()  conductor.cc 85
Conductor::AddTracks() conductor.cc 487

2.2 编码

公共部分:

rust 复制代码 
#24	webrtc::VideoStreamEncoder::OnEncodedImage 
-> webrtc/video/video_stream_encoder.cc:1834

...//中间部分在下面的平台编码

#18	webrtc::VideoStreamEncoder::EncodeVideoFrame 
-> webrtc/video/video_stream_encoder.cc:1760
#17	webrtc::VideoStreamEncoder::MaybeEncodeVideoFrame
-> webrtc/video/video_stream_encoder.cc:1619
#16	webrtc::VideoStreamEncoder::OnFrame 
-> webrtc/video/video_stream_encoder.cc:1308
#15	webrtc::VideoStreamEncoder::CadenceCallback::OnFrame 
-> webrtc/video/video_stream_encoder.h:152
#14	webrtc::(anonymous namespace)::PassthroughAdapterMode::OnFrame(
-> webrtc/video/frame_cadence_adapter.cc:64
#13	webrtc::(anonymous namespace)::FrameCadenceAdapterImpl::OnFrameOnMainQueue
-> webrtc/video/frame_cadence_adapter.cc:269
#12	 webrtc::(anonymous namespace)::FrameCadenceAdapterImpl::OnFrame
-> webrtc/video/frame_cadence_adapter.cc:245
#11	webrtc::(anonymous namespace)::FrameCadenceAdapterImpl::OnFrame
-> webrtc/video/frame_cadence_adapter.cc:239
#10	rtc::VideoBroadcaster::OnFrame
-> webrtc/media/base/video_broadcaster.cc:97

//ios & android ,Windows 不执行 跳过， ↑ ↑ ↑ ↑
#9	rtc::AdaptedVideoTrackSource::OnFrame
-> webrtc/media/base/adapted_video_track_source.cc:60

2.2.1 硬编码

2.2.1.1 IOS
shell 复制代码 
↑↑↑↑↑↑↑↑↑↑↑↑
看上面公共部分代码
↑↑↑↑↑↑↑↑↑↑↑↑

#23	invocation function for block in webrtc::(anonymous namespace)::ObjCVideoEncoder::RegisterEncodeCompleteCallback
-> webrtc/sdk/objc/native/src/objc_video_encoder_factory.mm:63

#22	-[RTCVideoEncoderH264 frameWasEncoded:flags:sampleBuffer:
codecSpecificInfo:width:height:renderTimeMs:timestamp:rotation:] 
-> webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm:853

#21 in (anonymous namespace)::compressionOutputCallback
-> webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm:161

#20	-[RTCVideoEncoderH264 encode:codecSpecificInfo:frameTypes:] 
-> webrtc/sdk/objc/components/video_codec/RTCVideoEncoderH264.mm:392

#19	webrtc::(anonymous namespace)::ObjCVideoEncoder::Encode
-> webrtc/sdk/objc/native/src/objc_video_encoder_factory.mm:81
2.2.1.1 Android
makefile 复制代码 
########################### jni ###########################
↑↑↑↑↑↑↑↑↑↑↑↑
看上面公共部分代码
↑↑↑↑↑↑↑↑↑↑↑↑

callback_->OnEncodedImage video_encoder_wrapper.cc:310
VideoEncoderWrapper::OnEncodedFrame video_encoder_wrapper.cc:258
Java_org_webrtc_VideoEncoderWrapper_nativeOnEncodedFrame VideoEncoderWrapper_jni.h:41
########################### java ###########################
nativeOnEncodedFrame:41 VideoEncoderWrapper.java
callback.onEncodedFrame:642 HardwareVideoEncoder.java
deliverEncodedImage():565 HardwareVideoEncoder.java
textureEglBase.swapBuffers:425  HardwareVideoEncoder.java
videoFrameDrawer.drawFrame:424  HardwareVideoEncoder.java
encodeTextureBuffer:414  HardwareVideoEncoder.java
encode:344 HardwareVideoEncoder.java
########################### jni ###########################
Java_VideoEncoder_encode VideoEncoder_jni.h :492
webrtc::jni::VideoEncoderWrapper::Encode
->video_encoder_wrapper.cc:147
2.2.1.1 Windows
arduino 复制代码 
//todo...没有硬编码环境

2.2.3 软编码

OpenH264:

arduino 复制代码 
↑↑↑↑↑↑↑↑↑↑↑↑
看上面公共部分代码
↑↑↑↑↑↑↑↑↑↑↑↑
H264EncoderImpl::Encode h264_encoder_impl.cc 365

2.3 编码结束 -> RTP 打包

shell 复制代码 
#36	webrtc::RtpPacketizerH264::PacketizeStapA
-> webrtc/modules/rtp_rtcp/source/rtp_format_h264.cc:161
#35	webrtc::RtpPacketizerH264::GeneratePackets
-> webrtc/modules/rtp_rtcp/source/rtp_format_h264.cc:103
#34	webrtc::RtpPacketizerH264::RtpPacketizerH264
-> webrtc/modules/rtp_rtcp/source/rtp_format_h264.cc:62
#33	webrtc::RtpPacketizerH264::RtpPacketizerH264
-> webrtc/modules/rtp_rtcp/source/rtp_format_h264.cc:51
#32	
#31 webrtc::RtpPacketizer::Create
-> webrtc/modules/rtp_rtcp/source/rtp_format.cc:43
#30	webrtc::RTPSenderVideo::SendVideo
-> webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc:486
#29	webrtc::RTPSenderVideo::SendEncodedImage
-> webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc:774
#28 webrtc::RtpVideoSender::OnEncodedImage
-> webrtc/call/rtp_video_sender.cc:600
#27	webrtc::internal::VideoSendStreamImpl::OnEncodedImage
-> webrtc/video/video_send_stream_impl.cc:566
#26 
#25 webrtc::VideoStreamEncoder::OnEncodedImage
-> webrtc/video/video_stream_encoder.cc:1904

2.4 打包完成 -> PacedSender 队列

rust 复制代码 
#41	webrtc::PacingController::EnqueuePacket
-> webrtc/modules/pacing/pacing_controller.cc:241
#40	webrtc::TaskQueuePacedSender::EnqueuePackets 
-> webrtc/modules/pacing/task_queue_paced_sender.cc:145
#39 webrtc::TaskQueuePacedSender::EnqueuePackets
-> webrtc/modules/pacing/task_queue_paced_sender.cc:140
#38 webrtc::RTPSender::EnqueuePackets
-> webrtc/modules/rtp_rtcp/source/rtp_sender.cc:509
#37 webrtc::RTPSenderVideo::LogAndSendToNetwork
-> webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc:210

2.5 Socket#send

shell 复制代码 
#59 ::sendto
#58 rtc::PhysicalSocket::DoSendTo
-> webrtc/rtc_base/physical_socket_server.cc:510
#57 rtc::PhysicalSocket::SendTo
-> webrtc/rtc_base/physical_socket_server.cc:375
#56 rtc::AsyncUDPSocket::SendTo
-> webrtc/rtc_base/async_udp_socket.cc:84
#55 cricket::UDPPort::SendTo
-> webrtc/p2p/base/stun_port.cc:286
#54 cricket::ProxyConnection::Send
-> webrtc/p2p/base/connection.cc:1371
#53 cricket::P2PTransportChannel::SendPacket
-> webrtc/p2p/base/p2p_transport_channel.cc:1616
#52 cricket::DtlsTransport::SendPacket
-> webrtc/p2p/base/dtls_transport.cc:417
#51 webrtc::RtpTransport::SendPacket
-> webrtc/pc/rtp_transport.cc:147
#50 webrtc::SrtpTransport::SendRtpPacket
-> webrtc/pc/srtp_transport.cc:173
#49 cricket::BaseChannel::SendPacket
-> webrtc/pc/channel.cc:437
#48 cricket::BaseChannel::SendPacket
-> webrtc/pc/channel.cc:318
#47 cricket::MediaChannel::DoSendPacket
-> webrtc/media/base/media_channel.cc:163
#46	 cricket::MediaChannel::SendPacket
-> webrtc/media/base/media_channel.cc:71
#45	 cricket::MediaChannel::SendRtp
-> webrtc/media/base/media_channel.cc:184
#44	 cricket::WebRtcVideoChannel::SendRtp
-> webrtc/media/engine/webrtc_video_engine.cc:2058
#43	 webrtc::RtpSenderEgress::SendPacketToNetwork
-> webrtc/modules/rtp_rtcp/source/rtp_sender_egress.cc:553
#42	 webrtc::RtpSenderEgress::SendPacket
-> webrtc/modules/rtp_rtcp/source/rtp_sender_egress.cc:273
#41	 webrtc::ModuleRtpRtcpImpl2::TrySendPacket
-> webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl2.cc:376
#40	 webrtc::PacketRouter::SendPacket
-> webrtc/modules/pacing/packet_router.cc:160
#39	 webrtc::PacingController::ProcessPackets
-> webrtc/modules/pacing/pacing_controller.cc:585
#38	webrtc::TaskQueuePacedSender::MaybeProcessPackets
-> webrtc/modules/pacing/task_queue_paced_sender.cc:234

3. 接收

3.1 接收 RTP 包

shell 复制代码 
#12	cricket::WebRtcVideoChannel::OnPacketReceived
-> webrtc/media/engine/webrtc_video_engine.cc:1744
#11	cricket::BaseChannel::OnRtpPacket
-> webrtc/pc/channel.cc:467
#10	webrtc::RtpDemuxer::OnRtpPacket
-> webrtc/call/rtp_demuxer.cc:249
#09	webrtc::RtpTransport::DemuxPacket
-> webrtc/pc/rtp_transport.cc:194
#08	webrtc::SrtpTransport::OnRtpPacketReceived
-> webrtc/pc/srtp_transport.cc:226
#07	webrtc::RtpTransport::OnReadPacket
-> webrtc/pc/rtp_transport.cc:268
#06	 cricket::DtlsTransport::OnReadPacket
-> webrtc/p2p/base/dtls_transport.cc:627
#05	cricket::P2PTransportChannel::OnReadPacket
-> webrtc/p2p/base/p2p_transport_channel.cc:2215
#04	cricket::Connection::OnReadPacket
-> webrtc/p2p/base/connection.cc:465
#03	cricket::UDPPort::OnReadPacket
-> webrtc/p2p/base/stun_port.cc:394
#02	cricket::UDPPort::HandleIncomingPacket
-> webrtc/p2p/base/stun_port.cc:335
#01	cricket::AllocationSequence::OnReadPacket
-> webrtc/p2p/client/basic_port_allocator.cc:1639

3.2 解包 & 放入缓冲区

rust 复制代码 
#25 webrtc::video_coding::FrameBuffer::InsertFrame
-> webrtc/modules/video_coding/frame_buffer2.cc:407
#24 webrtc::internal::VideoReceiveStream2::OnCompleteFrame
-> webrtc/video/video_receive_stream2.cc:660
#23 webrtc::RtpVideoStreamReceiver2::OnCompleteFrames
-> webrtc/video/rtp_video_stream_receiver2.cc:862
#22 webrtc::RtpVideoStreamReceiver2::OnAssembledFrame
-> webrtc/video/rtp_video_stream_receiver2.cc:850
#21 webrtc::RtpVideoStreamReceiver2::OnInsertedPacket
-> webrtc/video/rtp_video_stream_receiver2.cc:755
#20 webrtc::RtpVideoStreamReceiver2::OnReceivedPayloadData
-> webrtc/video/rtp_video_stream_receiver2.cc:620
#19 webrtc::RtpVideoStreamReceiver2::ReceivePacket
-> webrtc/video/rtp_video_stream_receiver2.cc:965
#18 webrtc::RtpVideoStreamReceiver2::OnRtpPacket
-> webrtc/video/rtp_video_stream_receiver2.cc:654
#17 webrtc::RtpDemuxer::OnRtpPacket
-> webrtc/call/rtp_demuxer.cc:249
#16 webrtc::RtpStreamReceiverController::OnRtpPacket
-> webrtc/call/rtp_stream_receiver_controller.cc:52
#15 webrtc::internal::Call::DeliverRtp
-> webrtc/call/call.cc:1615
#14	 webrtc::internal::Call::DeliverPacket
-> webrtc/call/call.cc:1637
#13	cricket::WebRtcVideoChannel::OnPacketReceived
-> webrtc/media/engine/webrtc_video_engine.cc:1748

3.3 解码

rust 复制代码 
#48 rtc::VideoBroadcaster::OnFrame
-> webrtc/media/base/video_broadcaster.cc:97
#47 cricket::WebRtcVideoChannel::WebRtcVideoReceiveStream::OnFrame
-> webrtc/media/engine/webrtc_video_engine.cc:3129
#46 webrtc::internal::VideoReceiveStream2::OnFrame
-> webrtc/video/video_receive_stream2.cc:589
#45 webrtc::IncomingVideoStream::Dequeue
-> webrtc/common_video/incoming_video_stream.cc:56
#44 webrtc::IncomingVideoStream::OnFrame
-> webrtc/common_video/incoming_video_stream.cc:47
#43 webrtc::IncomingVideoStream::OnFrame
-> webrtc/common_video/incoming_video_stream.cc:44
#42 webrtc::internal::VideoStreamDecoder::FrameToRender
-> webrtc/video/video_stream_decoder2.cc:51
#41 webrtc::VCMDecodedFrameCallback::Decoded
-> webrtc/modules/video_coding/generic_decoder.cc:74
#39	 webrtc::VCMDecodedFrameCallback::Decoded
-> webrtc/modules/video_coding/generic_decoder.cc:69


//....看个平台的实现

#34 webrtc::VCMGenericDecoder::Decode
-> webrtc/modules/video_coding/generic_decoder.cc:283

#33 webrtc::VideoReceiver2::Decode
-> webrtc/modules/video_coding/video_receiver2.cc:109

#32 webrtc::internal::VideoReceiveStream2::DecodeAndMaybeDispatchEncodedFrame
-> webrtc/video/video_receive_stream2.cc:842

#31 webrtc::internal::VideoReceiveStream2::HandleEncodedFrame
-> webrtc/video/video_receive_stream2.cc:776

#30 webrtc::internal::VideoReceiveStream2::StartNextDecode
-> webrtc/video/video_receive_stream2.cc:729

#29 webrtc::video_coding::FrameBuffer::StartWaitForNextFrameOnQueue
-> webrtc/modules/video_coding/frame_buffer2.cc:131

#28 webrtc::RepeatingTaskHandle webrtc::RepeatingTaskHandle::
DelayedStart<webrtc::video_coding::FrameBuffer::StartWaitForNextFrameOnQueue
-> webrtc/rtc_base/task_utils/repeating_task.h:130

#27 webrtc::video_coding::FrameBuffer::StartWaitForNextFrameOnQueue
-> webrtc/modules/video_coding/frame_buffer2.cc:106

#26 webrtc::video_coding::FrameBuffer::InsertFrame
-> webrtc/modules/video_coding/frame_buffer2.cc:499

3.3.1 硬解码

3.3.1.1 IOS
shell 复制代码 
↑↑↑↑↑↑↑↑↑↑↑↑
看上面公共部分代码
↑↑↑↑↑↑↑↑↑↑↑↑

#38	webrtc::(anonymous namespace)::ObjCVideoDecoder::RegisterDecodeCompleteCallback(
-> webrtc/sdk/objc/native/src/objc_video_decoder_factory.mm:70


#37	decompressionOutputCallback
-> webrtc/sdk/objc/components/video_codec/RTCVideoDecoderH264.mm:53

#36 -[RTCVideoDecoderH264 decode:missingFrames:codecSpecificInfo:renderTimeMs:] 
-> webrtc/sdk/objc/components/video_codec/RTCVideoDecoderH264.mm:107
#35	webrtc::(anonymous namespace)::ObjCVideoDecoder::Decode
-> webrtc/sdk/objc/native/src/objc_video_decoder_factory.mm:51
3.3.1.2 Android
ruby 复制代码 
↑↑↑↑↑↑↑↑↑↑↑↑
看上面公共部分代码
↑↑↑↑↑↑↑↑↑↑↑↑
########################### jni ###########################
webrtc::jni::VideoDecoderWrapper video_deocder_wrapper.cc 191
Java_org_webrtc_VideoDecoderWrapper_nativeOnDecodedFrame VideoDecoderWrapper_jni.cc 50
Java_org_webrtc_VideoDecoderWrapper_nativeOnDecodedFrame VideoDecoderWrapper_jni.cc 41
########################### java ###########################
lambda$createDecoderCallback$0:22, VideoDecoderWrapper.java
onFrame:451, AndroidVideoDecoder.java
tryDeliverTextureFrame:384, SurfaceTextureHelper.java
lambda$new$tryDeliverTextureFrame$SurfaceTextureHelper:207, SurfaceTextureHelper.java
deliverDecodedFrame:402, AndroidVideoDecoder.java
decode:209, AndroidVideoDecoder.java
########################### jni ###########################
Java_VideoDecoder_decode VideoDecoder_jni.cc 146
webrtc::jni::VideoDecoderWrapper::Decode video_decoder_wrapper.cc 123
webrtc::VideoDecoderSoftwareFallbackWrapper video_decoder_software_fallback_wrapper.cc 187
3.3.1.3 Windows
arduino 复制代码 
//todo ... 没有硬解码环境

3.3.2 软解码

FFmpeg h264:

arduino 复制代码 
↑↑↑↑↑↑↑↑↑↑↑↑
看上面公共部分代码
↑↑↑↑↑↑↑↑↑↑↑↑
H264DecoderImpl::Decode h264_decoder_impl.cc 256

3.4 视频渲染

3.4.1 IOS

shell 复制代码 
#51	 -[RTCMTLVideoView renderFrame:] 
-> webrtc/sdk/objc/components/renderer/metal/RTCMTLVideoView.m:253
#50	 webrtc::VideoRendererAdapter::OnFrame
-> webrtc/sdk/objc/api/RTCVideoRendererAdapter.mm:40
#49	 webrtc::VideoRendererAdapter::OnFrame
-> webrtc/sdk/objc/api/RTCVideoRendererAdapter.mm:30

3.4.2 Android

makefile 复制代码 
########################### java ###########################
eglBase.swapBuffers:669 EglRenderer.java
frameDrawer.drawFrame:664 EglRenderer.java
renderFrameOnRenderThread:597 EglRenderer.java
onFrame:102 SurfaceEglRenderer.java
onFrame:184 SurfaceVideoRenderer.java
onFrame:138, CallActivity$ProxyVideoSink.java
########################### jni ###########################
Java_VideoSink_onFrame VideoSink_jni.h 43
webrtc::jni::VideoSinkWrapper::OnFrame video_sink.cc 24

3.4.3 Windows

rust 复制代码 
MainWnd::VideoRenderer::OnFrame(const webrtc::VideoFrame& video_frame) main_wnd.cc 613

总结

通过该篇文章我们已经大致熟悉了 WebRTC 在 IOS 、Android 、Windows 平台上的视频数据流程，在阅读代码的过程中，我们可以看一下它是如何做到的跨平台，相关跨平台的 API 又是如何设计的？这些都是值得我们去学习的。

相关推荐
似霰1 小时前
安卓智能指针sp、wp、RefBase浅析
android·c++·binder
大风起兮云飞扬丶1 小时前
Android——网络请求
android
干一行，爱一行1 小时前
android camera data -＞ surface 显示
android
断墨先生1 小时前
uniapp—android原生插件开发（3Android真机调试）
android·uni-app
无极程序员3 小时前
PHP常量
android·ide·android studio
萌面小侠Plus4 小时前
Android笔记(三十三)：封装设备性能级别判断工具——低端机还是高端机
android·性能优化·kotlin·工具类·低端机
慢慢成长的码农4 小时前
Android Profiler 内存分析
android
大风起兮云飞扬丶4 小时前
Android——多线程、线程通信、handler机制
android
L72564 小时前
Android的Handler
android
清风徐来辽4 小时前
Android HandlerThread 基础
android
热门推荐
01【HarmonyOS】HUAWEI DevEco Studio 下载地址汇总02(欧拉)openEuler系统添加网卡文件配置流程、(欧拉)openEuler系统手动配置ipv6地址流程、(欧拉)openEuler系统网络管理说明03组基轨迹建模 GBTM的介绍与实现（Stata 或 R）04【AIGC】重塑未来的科技巨轮05全面解析：构建基于深度学习的安全帽检测系统（UI界面+YOLO代码+数据集）06【经验分享】Ubuntu22.04安装微信(linux官方版)07基于YOLOv10深度学习的CT扫描图像肾结石智能检测系统【python源码+Pyqt5界面+数据集+训练代码】深度学习实战、目标检测08Ubuntu 20.04使用Livox mid 360 测试 FAST_LIO09RAG 实践- Ollama+RagFlow 部署本地知识库10【TC3xx芯片】TC3xx芯片电源管理系统PMS详解