Dialogic Multimedia API Programming Guide
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Dialogic® Multimedia API Programming Guide March 2008 05-2455-002_D Copyright © 2005-2008 Dialogic Corporation. All rights reserved. You may not reproduce this document in whole or in part without permission in writing from Dialogic Corporation. All contents of this document are furnished for informational use only and are subject to change without notice and do not represent a commitment on the part of Dialogic Corporation or its subsidiaries (“Dialogic”). Reasonable effort is made to ensure the accuracy of the information contained in the document. However, Dialogic does not warrant the accuracy of this information and cannot accept responsibility for errors, inaccuracies or omissions that may be contained in this document. INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH DIALOGIC® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. 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Publication Date: March 2008 Document Number: 05-2455-002_D Dialogic® Multimedia API Programming Guide – March 2008 Dialogic Corporation Contents Revision History . 5 About This Publication . 7 Purpose . 7 Applicability . 7 Intended Audience. 7 How to Use This Publication . 8 Related Information . 8 1 Product Description . 9 1.1 Overview of Video Technology . 9 1.1.1 Video Codec . 9 1.1.2 Audio Codec . 9 1.1.3 Video Standards . 10 1.1.4 Intraframe (I-Frame) . 13 1.1.5 IP Media Server . 13 1.2 Multimedia Capabilities . 13 1.3 File Formats. 15 1.4 SIP Call Control Using Global Call . 15 1.5 SDP Functionality . 16 2 Event Handling . 17 3 Error Handling . 19 4 Application Development Guidelines . 21 4.1 Developing Multimedia Applications . 21 4.1.1 Video Mail . 21 4.1.2 Video Color Ring. 22 4.1.3 Video Caller ID . 23 4.1.4 Video Location Based Services . 23 4.2 Building Blocks for Multimedia Applications . 24 4.3 Call Flow of Video Mail . 24 4.4 Requesting I-Frame Using SIP INFO . 28 4.5 Making Connections Using Virtual CT Bus and New Packet Bus . 30 4.6 Enabling Digit Detection Using DX . 34 5 Building Applications. 37 5.1 Compiling and Linking . 37 5.1.1 Include Files . 37 5.1.2 Required Libraries . 37 5.1.3 Variables for Compiling and Linking . 37 Glossary . 39 Index . 43 Dialogic® Multimedia API Programming Guide – March 2008 3 Dialogic Corporation Contents Figures 1 Typical Call Flow of Video Mail. 25 2 Incoming SIP Call with Audio and Video SDP . 26 3 Incoming SIP Call with Only Audio SDP (video part is sent via re-INVITE) . 27 4 Connection Scenario 1 . 31 5 Connection Scenario 2 . 32 6 Connection Scenario 3 . 33 4 Dialogic® Multimedia API Programming Guide – March 2008 Dialogic Corporation Revision History This revision history summarizes the changes made in each published version of this document. Document No. Publication Date Description of Revisions 05-2455-002_D March 2008 Made global changes to reflect Dialogic Brand and changed title to “Dialogic® Multimedia API Programming Guide.” Required Libraries: Added note at end of this section. 05-2455-002 January 2006 Chapter changes: Moved the file conversion information that was in chapter 5 to a new document: the Dialogic® Multimedia File Conversion Tools User Guide to (05-2453-001). Made minor change in chapter sequence. Related Information section: Added the Dialogic® Multimedia File Conversion Tools User Guide. Multimedia Capabilities section: Based on web site revisions, changed the URL for the web page used to obtain the multimedia file conversion tools. 05-2455-001 September 2005 Initial version of document. Dialogic® Multimedia API Programming Guide — March 2008 5 Dialogic Corporation Revision History 6 Dialogic® Multimedia API Programming Guide — March 2008 Dialogic Corporation About This Publication The following topics provide information about this publication: • Purpose • Applicability • Intended Audience • How to Use This Publication • Related Information Purpose This document provides information about video technology and multimedia library features, as well as guidelines for building applications using the Dialogic® Multimedia API. The Dialogic Multimedia API provides the ability to record and play back digitized multimedia (audio and video) to support video services in application programs. This publication is a companion guide to the Dialogic® Multimedia API Library Reference, which provides details on functions and parameters in the multimedia software. Applicability This document version (05-2455-002_D) is published for Dialogic® Multimedia Software for AdvancedTCA Releases 1.0, 1.1, and 2.0. This document may also apply to other Dialogic® software releases. Check the Release Guide for your software release to determine whether this document is supported. Intended Audience This information is intended for: • Distributors • System Integrators • Toolkit Developers • Independent Software Vendors (ISVs) • Value Added Resellers (VARs) • Original Equipment Manufacturers (OEMs) Dialogic® Multimedia API Programming Guide — March 2008 7 Dialogic Corporation About This Publication How to Use This Publication Refer to this publication after you have installed the Dialogic® Host Media Processing (HMP) Software which includes the Dialogic® Multimedia API software. This publication assumes that you are familiar with and have prior experience with the operating system and the C programming language. The information in this publication is organized as follows: • Chapter 1, “Product Description” – provides an overview of video technology and the multimedia features of the Dialogic® HMP software. • Chapter 2, “Event Handling” – provides information about Dialogic Multimedia API events. • Chapter 3, “Error Handling” – provides information about Dialogic Multimedia API errors. • Chapter 4, “Application Development Guidelines” – provides some guidelines for developing multimedia applications. • Chapter 5, “Building Applications” – provides general information about building applications using the Dialogic Multimedia API library. This document also includes a glossary of terms and an index. Related Information See the following for additional information: • http://www.dialogic.com/manuals/ (for Dialogic® product documentation) • http://www.dialogic.com/support/ (for Dialogic technical support) • http://www.dialogic.com/ (for Dialogic® product information) 8 Dialogic® Multimedia API Programming Guide — March 2008 Dialogic Corporation 1Product. Description 1 This chapter provides an overview of video technology and the multimedia features of the Dialogic® Host Media Processing (HMP) Software. The following topics are included: • Overview of Video Technology. ..