FFMPEG -- WMA 轉換為 AAC 並存檔為 MP4

台灣地區的網路線上廣播，一般都是採用微軟的方式，其方法主要有兩個重點

• 透過 MMS(Microsoft Media Server) 協定來傳送音樂
• 使用 WMA(Windows Media Audio) 的格式來封裝音樂

ONVIF -- WS-Discovery spec

WS-Discovery 全名為 Web Service Dynamic Discovery

本篇將針對 WS-Discovery spec 作一整理，並介紹 ONVIF 使用 WS-Discovery 時，需做的一些變更，另外此處也介紹該如何使用 gSOAP 來進行實作。

一、WS-Discovery 定義三個角色

• Client
• Target Service
• Discovery Proxy

ONVIF -- WS-Discovery implementation

Here is a guide to teach you how to implement WS-Discovery by gSOAP. You can also find sample code here.

1. Xml Schema of WS-Discovery 

Use the typemap.dat file located in "\gsoap-2.8\gsoap\wsdl\".
WS-Discovery is already defined in typemap.dat.

 1 # WS-Discovery 1.1 and 1.0
 2 
 3 wsdd = <http://docs.oasis-open.org/ws-dd/ns/discovery/2009/01>
 4 wsdd10 = <http://schemas.xmlsoap.org/ws/2005/04/discovery>
 5 
 6 wsdd10__HelloType  = | wsdd__HelloType
 7 wsdd10__ByeType   = | wsdd__ByeType
 8 wsdd10__ProbeType  = | wsdd__ProbeType
 9 wsdd10__ProbeMatchesType = | wsdd__ProbeMatchesType
10 wsdd10__ProbeMatchType  = | wsdd__ProbeMatchType
11 wsdd10__ResolveType  = | wsdd__ResolveType
12 wsdd10__ResolveMatchesType = | wsdd__ResolveMatchesType
13 wsdd10__ResolveMatchType = | wsdd__ResolveMatchType
14 wsdd10__ScopesType  = | wsdd__ScopesType
15 wsdd10__SecurityType  = | wsdd__SecurityType
16 wsdd10__SigType   = | wsdd__SigType
17 wsdd10__AppSequenceType  = | wsdd__AppSequenceType

ONVIF -- Support Customized Event

If you want to support a customized event which not belong to ONVIF spec.
You can follow below setup to re-generate your gSoap code by gSOAP.

1. Revise WS-typemap.dat to add customized namespace

tnsMy = <http://www.avigilon.com/onvif/ver10/topics>

iOS -- Packet Tracing

當我們在 iOS Device 撰寫網路相關的 APP 時，時常需要分析網路上所傳送/接收的封包，由於 iOS 本身並沒有直接支援擷取封包的功能，因此需要使用其他方法來擷取網路封包。以下參考 developer.apple.com，整理封包擷取的方法。