公开(公告)号：EP2724526A1

公开(公告)日：2014-04-30

申请号：EP12737884.2

申请日：2012-06-19

申请人： NDS Limited

发明人： MEDAPATI, Arun Kumar ,  CHHABRA, Amit ,  CHANDUPATLA, Srinivas

IPC分类号： H04N5/783 ,  H04N5/913 ,  H04N21/438

CPC分类号： H04N21/2541 ,  H04N5/783 ,  H04N5/913 ,  H04N21/4384

摘要： A method and apparatus is described to achieve a fast service change. The method includes: receiving a plurality of transport streams at a client device, each transport stream including a plurality of encrypted services; decrypting an encrypted service from the plurality of encrypted services thereby forming a decrypted service; playing out the decrypted service; storing a portion of at least one encrypted service from the plurality of encrypted services in a storage device; receiving a request for displaying a different encrypted service; identifying a stored portion of the different encrypted service; decrypting the stored portion of the different encrypted service thereby forming a decrypted stored portion; playing out the decrypted stored portion of the different encrypted service at a faster than real time speed; storing a subsequent portion of the different encrypted service in the storage device, the subsequent portion corresponding to a subsequent portion of the different encrypted service received during the decrypting of the stored portion and the playing out the decrypted stored portion of the different encrypted service; decrypting the subsequent stored portion of the different encrypted service thereby forming a decrypted subsequent portion; and playing out the decrypted subsequent portion of the different encrypted service for display upon completion of the playing out of the decrypted stored portion.

摘要翻译： 描述了实现快速服务改变的方法和装置。 该方法包括：在客户端设备处接收多个传输流，每个传输流包括多个加密服务; 从所述多个加密服务解密加密服务，从而形成解密服务; 播放解密的服务; 将来自所述多个加密服务的至少一个加密服务的一部分存储在存储设备中; 接收显示不同加密服务的请求; 识别不同加密服务的存储部分; 解密所述不同加密服务的存储部分，从而形成解密的存储部分; 以比实时速度更快地播放不同加密服务的解密存储部分; 将所述不同加密服务的后续部分存储在所述存储装置中，所述后续部分对应于在所述存储部分的解密期间接收的所述不同加密服务的后续部分，以及播放所述不同加密服务的解密存储部分; 解密所述不同加密服务的后续存储部分，从而形成解密后续部分; 以及在解密的存储部分的播放完成时播放不同加密服务的解密后续部分以进行显示。