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宜阳建站,网站销售流程,哈尔滨高端模板建站,wordpress怎么填写Miracast 协议详解 一、Miracast 概述 Miracast 基于 Wi‑Fi Display (WFD) 标准#xff0c;用于将移动设备屏幕无线投射到显示设备。主要组件#xff1a; Wi‑Fi Direct (P2P)#xff1a;建立直连RTSP#xff1a;会话控制RTP/RTCP#xff1a;音视频传输UIBC#xff1a;用…Miracast 协议详解一、Miracast 概述Miracast 基于 Wi‑Fi Display (WFD) 标准用于将移动设备屏幕无线投射到显示设备。主要组件Wi‑Fi Direct (P2P)建立直连RTSP会话控制RTP/RTCP音视频传输UIBC用户输入回传二、Miracast 交互流程阶段1设备发现与 P2P 连接Source (手机) Sink (接收端) | | |--- Probe Request (WFD IE) ----| |-- Probe Response (WFD IE) ----| | | |--- P2P Device Discovery ------| |-- P2P Device Discovery ------| | | |--- P2P GO Negotiation --------| |-- P2P GO Negotiation ---------| | | |--- P2P Provisioning ----------| |-- P2P Provisioning -----------| | | |--- DHCP (获取IP) -------------| |-- DHCP (分配IP) --------------|阶段2RTSP 会话建立RTSP 用于能力协商和会话控制。2.1 M1 - RTSP OptionsSource - Sink: OPTIONS * RTSP/1.0 CSeq: 1 Require: org.wfa.wfd1.0 User-Agent: WFD/1.0 Sink - Source: RTSP/1.0 200 OK CSeq: 1 Public: org.wfa.wfd1.0, GET_PARAMETER, SET_PARAMETER2.2 M2 - Get Parameter (能力查询)Source - Sink: GET_PARAMETER rtsp://192.168.49.1/wfd1.0 RTSP/1.0 CSeq: 2 Content-Type: text/parameters Content-Length: length wfd_video_formats wfd_audio_codecs wfd_client_rtp_ports wfd_uibc_capability wfd_standby_resume_capabilitySink 响应包含支持的能力Sink - Source: RTSP/1.0 200 OK CSeq: 2 Content-Type: text/parameters Content-Length: length wfd_video_formats: 00 00 01 01 00000001 00 00000000 00000000 00 0000 0000 00 none none wfd_audio_codecs: AAC 00000001 00 wfd_client_rtp_ports: RTP/AVP/UDP;unicast 19000 0 modeplay wfd_uibc_capability: input_category_listHIDC;hidc_cap_listnone2.3 M3 - Set Parameter (能力协商)Source 选择参数并发送Source - Sink: SET_PARAMETER rtsp://192.168.49.1/wfd1.0 RTSP/1.0 CSeq: 3 Content-Type: text/parameters Content-Length: length wfd_video_formats: 00 00 01 01 00000001 00 00000000 00000000 00 0000 0000 00 none none wfd_audio_codecs: AAC 00000001 00 wfd_client_rtp_ports: RTP/AVP/UDP;unicast 19000 0 modeplay wfd_uibc_setting: enable2.4 M4 - Setup (建立传输通道)Source - Sink: SETUP rtsp://192.168.49.1/wfd1.0 RTSP/1.0 CSeq: 4 Transport: RTP/AVP/UDP;unicast;client_port19000-19001 Require: org.wfa.wfd1.0 Sink - Source: RTSP/1.0 200 OK CSeq: 4 Transport: RTP/AVP/UDP;unicast;client_port19000-19001;server_port19002-19003 Session: 12345678;timeout602.5 M5 - Play (开始播放)Source - Sink: PLAY rtsp://192.168.49.1/wfd1.0 RTSP/1.0 CSeq: 5 Session: 12345678 Sink - Source: RTSP/1.0 200 OK CSeq: 5 Session: 12345678阶段3RTP/RTCP 音视频传输RTP 包结构RTP Header (12 bytes): 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 -------------------------------- |V2|P|X| CC |M| PT | sequence number | -------------------------------- | timestamp | -------------------------------- | synchronization source (SSRC) identifier | -------------------------------- RTP Payload: - Video: H.264 NAL units - Audio: AAC framesRTCP 包结构RTCP SR (Sender Report): 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 -------------------------------- |V2|P| RC | PTSR200 | length | -------------------------------- | SSRC of sender | -------------------------------- | NTP timestamp, most significant word | -------------------------------- | NTP timestamp, least significant word | -------------------------------- | RTP timestamp | -------------------------------- | senders packet count | -------------------------------- | senders octet count | --------------------------------阶段4UIBC (用户输入回传)UIBC 允许 Sink 将触摸、键盘等输入回传给 Source。Source - Sink (M16): SET_PARAMETER rtsp://192.168.49.1/wfd1.0 RTSP/1.0 CSeq: 16 Content-Type: text/parameters Content-Length: length wfd_uibc_setting: enable wfd_uibc_capability: input_category_listHIDC;hidc_cap_listmouse keyboard三、WiFi 数据包解析1. Probe Request/Response (WFD IE)Probe Request Frame: [802.11 Header] [SSID: DIRECT-xx] [Supported Rates] [WFD IE] ← Miracast关键信息 - Device Type (Source/Sink) - Session Management Control Port (7236) - Maximum Throughput - WFD Information ElementsWFD IE 结构WFD IE (Information Element): Element ID: 221 (Vendor Specific) Length: Variable OUI: 50-6F-9A (Wi-Fi Alliance) OUI Type: 0x0A (WFD) Sub-elements: - Device Type (0x00) - Session Management Control Port (0x01) - Maximum Throughput (0x02) - WFD Extended Capability (0x03) - Local IP Address (0x04) - Associated BSSID (0x05) - WFD Session Information (0x06) - WFD Alternative MAC Address (0x07)2. P2P Action FrameP2P Action Frame: [802.11 Header] [Category: Public Action (0x04)] [Action: P2P (0x7F)] [P2P Attributes] - P2P Capability - P2P Device Info - P2P Group Owner Intent - P2P Configuration Timeout - P2P Listen Channel - P2P Operating Channel3. RTSP 数据包TCPEthernet Header (14 bytes) IP Header (20 bytes) TCP Header (20 bytes) RTSP Message: OPTIONS * RTSP/1.0\r\n CSeq: 1\r\n Require: org.wfa.wfd1.0\r\n User-Agent: WFD/1.0\r\n \r\n4. RTP 数据包UDPEthernet Header (14 bytes) IP Header (20 bytes) UDP Header (8 bytes) RTP Header (12 bytes) RTP Payload (H.264 NAL or AAC)四、关键参数说明视频格式参数 (wfd_video_formats)格式: 00 00 01 01 00000001 00 00000000 00000000 00 0000 0000 00 none none 解析: - 00 00: Native (1920x1080p60) - 01: Preferred Display Mode - 01: H264 Profile (High) - 00000001: H264 Level (4.0) - 00: CEA Mask (支持的分辨率位图) - 00000000: VESA Mask - 00000000: HH Mask - 00: Latency - 0000: Minimum Slice Size - 0000: Slice Encapsulation - 00: Frame Rate Control - none: 3D Video Formats - none: 3D Video Formats音频编解码参数 (wfd_audio_codecs)格式: AAC 00000001 00 解析: - AAC: 音频编解码器 - 00000001: 支持的AAC模式位图 - 00: LPCM模式不支持五、完整交互时序图Source Sink | | |-- Wi-Fi Probe (WFD IE) ------| |-- Wi-Fi Probe Response ------| | | |-- P2P Device Discovery -------| |-- P2P Device Discovery ------| | | |-- P2P GO Negotiation --------| |-- P2P GO Negotiation --------| | | |-- P2P Provisioning -----------| |-- P2P Provisioning ----------| | | |-- DHCP Request ---------------| |-- DHCP Response (IP分配) -----| | | |-- RTSP OPTIONS --------------| |-- RTSP 200 OK --------------| | | |-- RTSP GET_PARAMETER --------| |-- RTSP 200 OK (能力列表) -----| | | |-- RTSP SET_PARAMETER --------| |-- RTSP 200 OK --------------| | | |-- RTSP SETUP ----------------| |-- RTSP 200 OK (端口信息) -----| | | |-- RTSP PLAY -----------------| |-- RTSP 200 OK --------------| | | |-- RTP Video Stream ----------| |-- RTP Audio Stream ----------| |-- RTCP SR/RR ----------------| | | |-- RTSP TEARDOWN -------------| |-- RTSP 200 OK --------------|