臺灣博碩士論文加值系統

在觀賞影片的過程中，使用者對於影片播放品質之需求可能會改變，同時網路狀態亦會改變，為因應網際網路上不可預期的變化以及使用者的自主性需求，並且確保影片播放時的順暢度的前提下，本論文提出並建置出一具使用者導向之動態串流服務品質播放系統(User-Oriented QoS Streaming Presentation System, UQSP)，UQSP系統為整合式與分化式混合網路架構，UQSP系統利用所設計的使用者導向之動態性服務品質播放控制(User-Oriented Dynamic QoS Presentation Control, UDQP)機制，提供使用者方便地來設定所需要的媒體與傳輸服務品質參數，並透過服務品質交換(QoS Switching)技術達成即時且動態地調整所設定之影片品質。此外，本論文提出無中斷緩衝與傳送控制(Seamless Buffering and Transmission Control, SBTC)機制，其功能在來解決傳統QoS Switching技術所遭遇到的交換時間(switching time)過長問題，讓使用者可以提早獲得到品質調整並維持播放時的順暢度。另一方面，本論文在多頻串流(multiple streaming)傳送下，設計MPEG影音同步與播放(MPEG Audio/Video Synchronization and Presentation, MAVSP)機制，以解決因遭遇封包延遲與封包遺失所造成之媒體流不同步以及影片播放品質下降的問題。

With the advance of Internet and broadband, the potential of Internet multimedia application is growing rapidly. However, during the process of movie playback, the functions of the traditional Internet multimedia application can’t satisfy the QoS requirement of the user and the variation of network status. Therefore, in this paper, we propose and implement the User-Oriented QoS Streaming Presentation System (UQSP) based on the combination of DiffServ and IntServ network. Furthermore, in this system, we present the User-Oriented Dynamic QoS Presentation control (UDQP) mechanism, the Seamless Buffering and Transmission Control (SBTC) mechanism and the MPEG Audio/Video Synchronization and Presentation (MAVSP) mechanism. The main advantages of UQSP are as follows. (i) During the process of movie playback, the user can select the mode is fit for the user and set the media and traffic control parameters in the mode selected by the user. Additionally, by the implement of QoS switching technology for multimedia streaming, the UDQP mechanism can provide real-time adaptation of media QoS with the user. (ii) Besides, the SBTC mechanism can improve the time length problem of switching that traditional QoS switching scheme meets. (iii) Finally, the MAVSP mechanism can solve the problems of stream asynchronism and playback quality degradation that resulted from the packet delay and packet loss.

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VI
表目錄 IX
1. 緒論 1
1.1 研究背景與動機 1
1.3 研究目的 4
1.3 論文架構 6
2. 文獻探討 8
2.1 MPEG實作原理 8
2.2 多媒體服務品質 14
2.2.1 整合式服務 14
2.2.2 分化式服務 16
2.3 DirectShow運作原理探討 18
2.4 流量控制 22
2.5 多媒體同步控制 24
3. 系統架構與服務品質控制策略 27
3.1 使用者導向之動態服務品質播放控制機制 27
3.1.1 使用者導向介面設計與多媒體服務品質參數對應 27
3.1.2 動態品質認知播放控制 30
3.1.2.1 使用者導向之動態媒體服務品質調整 30
3.1.2.2 視窗符合播放控制 34
3.1.2.3 播放視窗大小控制 36
3.2 無中斷緩衝與傳送控制機制 37
3.3 MPEG影音同步播放機制 47
3.3.1 影音同步控制機制 47
3.3.2 訊框遺失控制機制 51
3.3.2.1視訊流封包遺失控制 53
3.3.2.2音訊流封包遺失控制 58
4. 系統實作 60
4-1 系統架構與系統元件 60
4-2 系統運作流程 65
4.3 建立連線與資源保留之流程 69
5. 系統效能與分析 72
6. 結論 82
參考文獻 84
作者簡介 89

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