TITRE Adaptive Packet Video Streaming Over IP Networks - LaBRI

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A.3 Object Description Framework The purpose of the MPEG-4 object descriptor framework is to identify, describe and associate elementary streams with the various components of an audiovisual scene [22]. A “bootstrap” stream describes the streaming resources used in a virtual world. A media object is associated to its elementary stream resources via an object descriptor. The Figure A-4 shows the principle of MPEG- 4 Object Descriptor. initial ObjectDescriptor ES_Descriptor : ES_Descriptor ES_ID BIFS Update (Replace Scene) Scene Description Scene Description Stream e.g. Audio Source e.g. Video Object 2D ES_ID ObjectDescriptorID ObjectDescriptorUpdate ObjectDescriptor Object Descriptor Stream Object Descriptor ES_D ES_D Object Descriptor ... ... ES_D ... ... ES_Descriptor : ES_Descriptor ES_ID ES_ID Visual Stream (e.g. base layer) Visual Stream (e.g. temporal enhancement) Audio Stream Figure A-4: MPEG-4 object descriptor structure A.3.1 Object Descriptor An object descriptor is a collection of one or more Elementary Stream descriptors that provide configuration and other information for the streams that relate to a single object (media object or scene description. Each object descriptor is assigned an identifying number (Object Descriptor ID), which is unique within the current session. This identifier is used to associate media objects in the Scene Description with a particular object descriptor, and thus the elementary streams related to that particular object. Elementary Stream descriptors include information about the source of the stream data, in form of a unique numeric identifier (the Elementary Stream ID) or a URL pointing to a remote source for the stream. ES IDs are resolved to particular delivery channels at the transport layer. ES Descriptors also include information about the encoding format, configuration information for the decoding process and the Sync Layer packetization, as well as QoS (quality of service) requirements for the transmission of the stream and intellectual property identification. Dependencies between streams can also be signalled, for example to indicate dependence of an enhancement stream to its base stream in scalable AVO representations, or the availability of the same speech content in various languages. A.3.2 Initial Object Descriptor Initial object descriptors (IODs) serve to access MPEG-4 content. The IOD is an object descriptor that does not only describe a set of elementary streams, but it also conveys the set of profile and level information that is needed by a receiver to assess the processing resources needed for that content. 172
A.3.3 Scene Description Streams Scene description addresses the organization of AVOs in a scene, in terms of both spatial and temporal positioning. This information allows the composition and rendering of individual AVOs after their respective decoders reconstruct them. This specification, however, does not mandate particular composition or rendering algorithms or architectures since they are implementationdependent. A.3.4 ES_Descriptor ES_Descriptor conveys all information related to a particular elementary stream and has three major parts. 1. The first part consists of the identifier ES_ID, which is a unique reference to the elementary stream within its name scope, a mechanism to group elementary streams within this ObjectDescriptor and an optional URL string. 2. The second part is a set of optional extension descriptors that support the inclusion of future extensions as well as the transport of private data in a backward compatible way. 3. The third part consists of the DecoderConfigDescriptor, SLConfigDescriptor, IPI_Descriptor and QoS_Descriptor structures, which convey the parameters and requirements of the elementary stream. Appendix A gives a structure example of an ES_Descriptor. A.3.5 DecoderConfigDescriptor DecoderConfigDescriptor provides information about the decoder type and the required decoder resources needed for the associated elementary stream. This is needed at the receiver to determine whether it is able to decode the elementary stream. A stream type identifies the category of the stream while the optional decoder specific information descriptor contains stream specific information for the set up of the decoder in a stream specific format that is opaque to this layer. A.3.6 DecoderSpecificInfo Decoder specific information constitutes an opaque container with information for a specific media decoder. Depending on the required amount of data, two classes with a maximum of 255 and 2 32 -1 bytes of data are provided. A.3.7 SLConfigDescriptor This descriptor defines the configuration of the Sync Layer header for this elementary stream. A.3.8 IP Identification Data Set Intellectual Property Identification Data Set is used to identify content. All types of elementary streams carrying content can be identified using this mechanism. The content types include audio, visual and scene description data. Multiple IP_IdentificationDataSet may be associated to one elementary stream. The IPI information shall never be detached from the ES_Descriptor. 173
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UNIVERSITÉ DE VERSAILLES SAINT-QUE
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Résumé Nous constatons aujourd’
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3 Related Work ....................
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5.5.1.2 Simulation Results.........
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List of Figures Figure 1-1: Structu
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Figure 5-15: End-to-end packet tran
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Acknowledgments The first person I
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[11] Toufik Ahmed, Guillaume Burida
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d’accès. Les interactions de QoS
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Métrique MAX_DELAY PREF_MAX_DELAY
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1.1.2 Proposition dun Protocole d'E
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des paquets RTP. Reste toujours le
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Nous pouvons distinguer trois possi
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1.1.2.5.2 Multiplexage des Flux El
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l’horloge est par défaut égale
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La valeur R TCP représente le déb
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Pour ces raisons, nous nous intére
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Telles que illustrés par la Figure
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3. DMIF2SIP vérifie si son propre
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utilisée optionnellement pour loca
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Chapter 2 2 Introduction 2.1 Motiva
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conditions. Based on end-to-end fee
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Chapter 3 3 Related Work Nowadays,
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• multicasting: it takes the stre
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expensive, fixed delivery and recep
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3.1.6 Static vs. Dynamic Channels T
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environment because they require a
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H.261 is called video codec for aud
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VideoScene (VS) VideoObject (VO) Vi
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The emphasis of MPEG-7 will be the
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Temporal scalability involves parti
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multitude of streams. It can switch
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increased linearly in the absence o
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3.2.2.1 End-to-End Retransmission R
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correctly received block. The missi
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epresent user traffic. The delay ca
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3.2.5 IP Signaling Protocols for Pa
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two H.323 endpoints or between an e
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Chapter 4 4 Adaptive Packet Video T
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4.1.1 Video Classification Model Pr
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attributes can refer to the QoS par
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In RBF, 2 D = X − is the distance
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Figure 4-6: Experiment testbed In t
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190 180 170 End-to-end delay MPEG-4
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Sync Layer. The SL-packetized strea
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conveyed by MIME format parameters
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the same value. This timing informa
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4.2.2.1 Fragmentation We propose to
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Timestamp: Indicates the sampling i
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When G is used as generator matrix,
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4.2.3 Performance Evaluation Intens
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0.3 0.25 our proposal classical app
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lost packet at the receiver. Conseq
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marking scheme. The server must be
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The video server adds audio-visual
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Marker (TR3CM) [131] to mark the ba
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VO1 VO2 AVO Scenario Audio BL EL1 E
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Throughput (Kbits) 3000 2500 2000 1
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Throughput (Kbits) 3000 2500 2000 1
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4000 3500 3000 2500 2000 1500 1000
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45 40 Original Quality Received Qua
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Chapter 5 5 A Dynamic Packet Video
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The TCM algorithm is based on a tok
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BEGIN Initialize the classification
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User Profile (Token Bucket) Traffic
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5.3.3 QoS Management Algorithm Spec
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Figure 5-7: Hierarchical aggregatio
Page 137 and 138: • Filters: to put packets into cl
Page 139 and 140: mechanism associated with the Drop
Page 141 and 142: Figure 5-16: Packets loss with IP D
Page 143 and 144: 5.5.2.3 Experimental Results Figure
Page 145 and 146: 1 MPEG-4 Based Layer Stream -AF11 M
Page 147 and 148: 0.2 0.18 MPEG-4 Based Layer Stream
Page 149 and 150: By using our PBNM tool, we allocate
Page 151 and 152: Id Condition Indicator Action 1 Net
Page 153 and 154: The proposed marking algorithm bett
Page 155 and 156: Chapter 6 6 A SIP/MPEG-4 Multimedia
Page 157 and 158: performed by many ways like SLA (Se
Page 159 and 160: 6.1.1.4 SIP Communication Model SIP
Page 161 and 162: • It assign a value (network sess
Page 163 and 164: 6.2.1 SIP2DMIF Subsystem The SIP2DM
Page 165 and 166: Step 1: The MPEG-4 Terminal passes
Page 167 and 168: 1. Set the result C to the empty se
Page 169 and 170: TCP/UDP port, our implementation us
Page 171 and 172: Control & Data Plan Video Rate Cont
Page 173 and 174: characteristics and relevance of ea
Page 175 and 176: References [1] Kazaa Media Desktop
Page 177 and 178: [43] B. Schuster, “Fine granular
Page 179 and 180: [79] D. Bansal and H. Balakrishnan,
Page 181 and 182: [115] N. Laoutaris, I. Stavrakakis,
Page 183 and 184: [154] W. Almesberger, J. H. Salim,
Page 185 and 186: Appendix A A Appendix A: Overview o
Page 187: Media aware Delivery unaware ISO/IE
Page 191: This appendix presents structure ex
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