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建筑企业登录哪个网站,免费自助建站网站建设免费信息发布,凡科网建站入门教程,中国建设银行北京天竺支行网站调试rtsp收发流时#xff0c;经常会需要抓包以确认是网络问题还是程序问题还是其它问题。通过tcpdump或者wireshark抓到的包通常是rtp流#xff0c;保存为.pcap格式文件后中#xff0c;可通过wireshark进行解析#xff0c;得出h264裸流#xff0c;并保存为文件。 1.wires… 调试rtsp收发流时经常会需要抓包以确认是网络问题还是程序问题还是其它问题。通过tcpdump或者wireshark抓到的包通常是rtp流保存为.pcap格式文件后中可通过wireshark进行解析得出h264裸流并保存为文件。 1.wireshark配置 从gitee上可以直接下载的  WiresharkPlugin: The H265 H264 PS PCM AMR SILK plugin for Wireshark Lua (gitee.com) 1.1 下载rtp_h365_extractor.lua  – Dump RTP h.265 payload to raw h.265 file (*.265) – According to RFC7798 to dissector H265 payload of RTP to NALU, and write it – to fromsourceIp_sourcePorttodstIp_dstPort.265 file. – By now, we support Single NAL Unit Packets, Aggregation Packets (APs) – and Fragmentation Units (FUs) format RTP payload for H.265. – You can access this feature by menu Tools – Reference from Huang Qiangxiong (qiangxiong.huanggmail.com)

– Author: Yang Xing (hongch_911126.com)

dolocal version_str string.match(_VERSION, %d[.]%d*)local version_num version_str and tonumber(version_str) or 5.1local bit (version_num 5.2) and require(bit32) or require(bit)function string.starts(String,Start)return string.sub(String,1,string.len(Start))Startendfunction string.ends(String,End)return End or string.sub(String,-string.len(End))Endendfunction get_temp_path()local tmp nilif tmp nil or tmp thentmp os.getenv(HOME)if tmp nil or tmp thentmp os.getenv(USERPROFILE)if tmp nil or tmp thentmp persconffile_path(temp)elsetmp tmp .. /wireshark_tempendelsetmp tmp .. /wireshark_tempendendreturn tmpendfunction get_ffmpeg_path()local tmp nilif tmp nil or tmp thentmp os.getenv(FFMPEG)if tmp nil or tmp thentmp elseif not string.ends(tmp, /bin/) thentmp tmp .. /bin/endendendreturn tmpend– for geting h265 data (the fields value is type of ByteArray)local f_h265 Field.new(h265) local f_rtp Field.new(rtp) local f_rtp_seq Field.new(rtp.seq)local f_rtp_timestamp Field.new(rtp.timestamp)local filter_string nil– menu action. When you click Tools-Export H265 to file will run this functionlocal function export_h265_to_file()– window for showing informationlocal tw TextWindow.new(Export H265 to File Info Win)local pgtw;– add message to information windowfunction twappend(str)tw:append(str)tw:append(\n)endlocal ffmpeg_path get_ffmpeg_path()– temp pathlocal temp_path get_temp_path()– running first time for counting and finding spspps, second time for real savinglocal first_run true local writed_nalu_begin false– variable for storing rtp stream and dumping parameterslocal stream_infos nil– trigered by all h265 packatslocal list_filter if filter_string nil or filter_string thenlist_filter h265elseif string.find(filter_string,h265)~nil thenlist_filter filter_stringelselist_filter h265 ..filter_stringendtwappend(Listener filter: .. list_filter .. \n)local my_h265_tap Listener.new(frame, list_filter)– get rtp stream info by src and dst addressfunction get_streaminfo(pinfo)local key from .. tostring(pinfo.src) .. _ .. tostring(pinfo.src_port) .. to .. tostring(pinfo.dst) .. _ .. tostring(pinfo.dst_port)key key:gsub(:, .)local stream_info stream_infos[key]if not stream_info then – if not exists, create onestream_info { }stream_info.filename key.. .265– stream_info.filepath stream_info.filename– stream_info.file,msg io.open(stream_info.filename, wb)if not Dir.exists(temp_path) thenDir.make(temp_path)endstream_info.filepath temp_path../..stream_info.filenamestream_info.file,msg io.open(temp_path../..stream_info.filename, wb)if msg thentwappend(io.open ..stream_info.filepath.., error ..msg)end– twappend(Output file path: .. stream_info.filepath)stream_info.counter 0 – counting h265 total NALUsstream_info.counter2 0 – for second time runningstream_infos[key] stream_infotwappend(Ready to export H.265 data (RTP from .. tostring(pinfo.src) .. : .. tostring(pinfo.src_port) .. to .. tostring(pinfo.dst) .. : .. tostring(pinfo.dst_port) .. write to file:[ .. stream_info.filename .. ] …)endreturn stream_infoend– write a NALU or part of NALU to file.local function write_to_file(stream_info, str_bytes, begin_with_nalu_hdr, end_of_nalu)if first_run thenstream_info.counter stream_info.counter 1if begin_with_nalu_hdr then– save VPS SPS PPSlocal nalu_type bit.rshift(bit.band(str_bytes:byte(0,1), 0x7e),1)if not stream_info.vps and nalu_type 32 thenstream_info.vps str_byteselseif not stream_info.sps and nalu_type 33 thenstream_info.sps str_byteselseif not stream_info.pps and nalu_type 34 thenstream_info.pps str_bytesendendelse – second time runningif not writed_nalu_begin thenif begin_with_nalu_hdr thenwrited_nalu_begin trueelsereturnendendif stream_info.counter2 0 thenlocal nalu_type bit.rshift(bit.band(str_bytes:byte(0,1), 0x7e),1)if nalu_type ~ 32 then– write VPS SPS and PPS to file header firstif stream_info.vps thenstream_info.file:write(\x00\x00\x00\x01)stream_info.file:write(stream_info.vps)elsetwappend(Not found VPS for [ .. stream_info.filename .. ], it might not be played!)endif stream_info.sps thenstream_info.file:write(\x00\x00\x00\x01)stream_info.file:write(stream_info.sps)elsetwappend(Not found SPS for [ .. stream_info.filename .. ], it might not be played!)endif stream_info.pps thenstream_info.file:write(\x00\x00\x00\x01)stream_info.file:write(stream_info.pps)elsetwappend(Not found PPS for [ .. stream_info.filename .. ], it might not be played!)endendendif begin_with_nalu_hdr then– *.265 raw file format seams that every nalu start with 0x00000001stream_info.file:write(\x00\x00\x00\x01)endstream_info.file:write(str_bytes)stream_info.counter2 stream_info.counter2 1– update progress windows progress barif stream_info.counter 0 and stream_info.counter2 stream_info.counter thenpgtw:update(stream_info.counter2 / stream_info.counter)endendend– read RFC3984 about single nalu/ap/fu H265 payload format of rtp– single NALU: one rtp payload contains only NALUlocal function process_single_nalu(stream_info, h265)write_to_file(stream_info, h265:tvb():raw(), true, true)end– APs: one rtp payload contains more than one NALUslocal function process_ap(stream_info, h265)local h265tvb h265:tvb()local offset 2repeatlocal size h265tvb(offset,2):uint()write_to_file(stream_info, h265tvb:raw(offset2, size), true, true)offset offset 2 sizeuntil offset h265tvb:len()end– FUs: one rtp payload contains only one part of a NALU (might be begin, middle and end part of a NALU)local function process_fu(stream_info, h265)local h265tvb h265:tvb()local start_of_nalu (h265tvb:range(2, 1):bitfield(0,1) ~ 0)local end_of_nalu (h265tvb:range(2, 1):bitfield(1,1) ~ 0)if start_of_nalu then– start bit is set then save nalu header and bodylocal nalu_hdr_0 bit.bor(bit.band(h265:get_index(0), 0x81), bit.lshift(bit.band(h265:get_index(2),0x3F), 1))local nalu_hdr_1 h265:get_index(1)write_to_file(stream_info, string.char(nalu_hdr_0, nalu_hdr_1) .. h265tvb:raw(3), start_of_nalu, end_of_nalu)else– start bit not set, just write part of nalu bodywrite_to_file(stream_info, h265tvb:raw(3), start_of_nalu, end_of_nalu)endend– call this function if a packet contains h265 payloadfunction my_h265_tap.packet(pinfo,tvb)if stream_infos nil then– not triggered by button event, so do nothing.returnendlocal h265s { f_h265() } – using table because one packet may contains more than one RTPfor i,h265_f in ipairs(h265s) doif h265_f.len 5 thenreturnendlocal h265 h265_f.range:bytes() local hdr_type h265_f.range(0,1):bitfield(1,6)local stream_info get_stream_info(pinfo)if hdr_type 0 and hdr_type 48 then– Single NALUprocess_single_nalu(stream_info, h265)elseif hdr_type 48 then– APsprocess_ap(stream_info, h265)elseif hdr_type 49 then– FUsprocess_fu(stream_info, h265)elsetwappend(Error: No. .. tostring(pinfo.number) .. unknown type .. hdr_type .. ; we only know 1-47(Single NALU),48(APs),49(FUs)!)endendend– close all open fileslocal function close_all_files()twappend()local index 0;if stream_infos thenlocal no_streams truefor id,stream in pairs(stream_infos) doif stream and stream.file thenstream.file:flush()stream.file:close()stream.file nilindex index 1twappend(index .. : [ .. stream.filename .. ] generated OK!)local anony_fuc function ()twappend(ffplay -x 640 -y 640 -autoexit ..stream.filename)–copy_to_clipboard(ffplay -x 640 -y 640 -autoexit ..stream.filepath)os.execute(ffmpeg_path..ffplay -x 640 -y 640 -autoexit ..stream.filepath)endtw:add_button(Play ..index, anony_fuc)no_streams falseendendif no_streams thentwappend(Not found any H.265 over RTP streams!)elsetw:add_button(Browser, function () browser_open_data_file(temp_path) end)endendendfunction my_h265_tap.reset()– do nothing nowendtw:set_atclose(function ()my_h265_tap:remove()if Dir.exists(temp_path) thenDir.remove_all(temp_path)endend)local function export_h265()pgtw ProgDlg.new(Export H265 to File Process, Dumping H265 data to file…)first_run truestream_infos {}– first time it runs for counting h.265 packets and finding SPS and PPSretap_packets()first_run false– second time it runs for saving h265 data to target file.retap_packets()close_all_files()– close progress windowpgtw:close()stream_infos nilendtw:add_button(Export All, function ()export_h265()end)tw:add_button(Set Filter, function ()tw:close()dialog_menu()end)endlocal function dialog_func(str)filter_string strexport_h265_to_file()endfunction dialog_menu()new_dialog(Filter Dialog,dialog_func,Filter)endlocal function dialog_default()filter_string get_filter()export_h265_to_file()end– Find this feature in menu Toolsregister_menu(Video/Export H265, dialog_default, MENU_TOOLS_UNSORTED) end 1.2 rtp_h365_extractor.lua放在 Wireshark 安装目录中 1.3 修改init.lua配置文件 2. 流分析 2.1.  解码为RTP数据包 使用wireshark抓包工具抓取码流包如下图基于UDP传输。 选中其中一个数据包(包要选择正确,可根据protocol的类型选择)右键选择解码为如下图。 新增解码规则选择解码为RTP流如下图。 解码后可看到数据包解码成了RTP包如下图。 导出h265视频流 2.2. vlc播放视频流