WO2010015882A1 - Zapping de chaîne rapide - Google Patents

Zapping de chaîne rapide Download PDF

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Publication number
WO2010015882A1
WO2010015882A1 PCT/IB2008/053180 IB2008053180W WO2010015882A1 WO 2010015882 A1 WO2010015882 A1 WO 2010015882A1 IB 2008053180 W IB2008053180 W IB 2008053180W WO 2010015882 A1 WO2010015882 A1 WO 2010015882A1
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WO
WIPO (PCT)
Prior art keywords
stream
decrypted
acquired
video frames
access point
Prior art date
Application number
PCT/IB2008/053180
Other languages
English (en)
Inventor
David Fink
Sara Novogrodsky
Yair Mirsky
Kevin Murray
Original Assignee
Nds Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nds Limited filed Critical Nds Limited
Priority to PCT/IB2008/053180 priority Critical patent/WO2010015882A1/fr
Publication of WO2010015882A1 publication Critical patent/WO2010015882A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/42623—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific decryption arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8455—Structuring of content, e.g. decomposing content into time segments involving pointers to the content, e.g. pointers to the I-frames of the video stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Definitions

  • channel zapping Changing channels, in modern television systems, is referred to as "channel zapping".
  • the time required for a set top box to tune to a new channel; begin decrypting an encrypted broadcast on the new channel; decompress (that is to say, using the correct term of the art: "decode”) decrypted video on the new channel; and actually begin displaying decompressed (decoded) decrypted video on the new channel is, accordingly, referred to as zapping time.
  • a method including tuning a set top box to a carrier frequency, the carrier frequency carrying a transport stream, acquiring a subset of transport stream associated metadata, the subset of transport stream associated metadata including a plurality of pointers to a plurality of elementary streams, the plurality of elementary streams including data and metadata associated with a desired content item, acquiring the plurality of elementary streams indicated in the subset of transport stream associated metadata, the plurality of elementary streams including at least a first stream including encrypted video frames, the encrypted video frames including at least one frame which includes an encrypted access point, and a second stream including an entitlement control word (ECM) stream, caching the encrypted video frames acquired from the first stream, acquiring an ECM from the second stream, the acquired ECM being associated with the cached acquired encrypted video frames, deriving a control word (CW) from the acquired ECM, decrypting the cached acquired encrypted video frames according to the CW, locating the at least one decrypted access point in the first stream, decrypting encrypted video frames
  • ECM entitlement control word
  • the displaying includes at least one of displaying all decrypted decoded frames until the decoding of the video has caught up with the real time broadcast, displaying only some of the decrypted decoded frames until the decoding of the video has caught up with the real time broadcast, displaying only a single decrypted decoded I-frame until the decoding of the video has caught up with the real time broadcast, and not displaying any video until the decoding of the video has caught up with the real time broadcast.
  • the access point includes a recovery point.
  • the set top box includes a personal video recorder.
  • the displaying includes displaying substantially immediately after decoding the decrypted first stream.
  • the decrypting, decoding and displaying is performed at better than real-time until the displaying catches-up to a real-time display.
  • the decrypting, decoding and displaying includes not decoding and not displaying selected decrypted frames.
  • the selected decrypted frames include at least one frame that can be used as a reference for decoding at least one other frame.
  • the selected decrypted frames include at least one of an I-frame and a P- frame.
  • the selected decrypted frames include non-advertisement associated frames.
  • the at least one decrypted access point includes one of an intra-coded frame (I-frame), and an Instantaneous Decoding Refresh frame (IDR-frame).
  • the acquiring the plurality of elementary streams indicated in the subset of transport stream associated metadata includes acquiring a program association table (PAT) from the transport stream, based on information in the PAT, acquiring a program map table (PMT), acquiring the plurality of elementary streams indicated in the PMT.
  • PAT program association table
  • PMT program map table
  • the acquiring the plurality of elementary streams indicated in the subset of transport stream associated metadata includes acquiring out-of-band data
  • the acquiring the plurality of elementary streams includes acquiring the plurality of elementary streams indicated in the acquired out-of-band data .
  • the acquired out-of-band data includes data in a proprietary format. Still further in accordance with an embodiment of the present invention the acquired out-of-band data includes non-DVB format data.
  • the decrypting includes partial decrypting.
  • the decoding includes partial decoding.
  • a method including tuning a set top box to a carrier frequency, the carrier frequency carrying a transport stream, acquiring a program association table (PAT) from the transport stream, based on information in the PAT, acquiring a program map table (PMT), acquiring elementary streams indicated in the PMT, the elementary streams including at least a stream including encrypted video frames, the encrypted video frames including at least one frame which includes an encrypted access point, and an entitlement control word (ECM) stream, caching the acquired encrypted video frames, acquiring an ECM from the ECM stream, deriving a control word (CW) from the ECM, decrypting the cached acquired encrypted video frames according to the CW, locating the at least one decrypted access point in the cached video stream, decoding at least one decrypted video frame from the at least one decrypted access point, and displaying the at least one decoded decrypted video frame beginning at the located at least one decrypted access point, wherein the decrypt
  • a system including a tuner included in a set top box which tunes the set top box to a carrier frequency, the carrier frequency carrying a transport stream, a subset of transport stream associated metadata acquired by the set top box, the subset of transport stream associated metadata including a plurality of pointers to a plurality of elementary streams, the plurality of elementary streams including data and metadata associated with a desired content item, the plurality of elementary streams indicated in the subset of transport stream associated metadata acquired by the set top box, the plurality of elementary streams including at least a first stream including encrypted video frames, the encrypted video frames including at least one frame which includes an encrypted access point, and a second stream including an entitlement control word (ECM) stream, a cache included in the set top box that caches the encrypted video frames acquired from the first stream, an ECM from the second stream which is acquired by the set top box, the acquired ECM being associated with the cached acquired encrypted video frames, a control word (CW) derived by the set top box from the acquired E
  • ECM entitlement control word
  • a system including a tuner included in a set top box which tunes the set top box, the carrier frequency carrying a transport stream, a program association table (PAT) which is acquired from the transport stream by the set top box, a program map table (PMT) which is acquired by the set top box based on information in the PAT, acquiring, elementary streams indicated in the PMT which are acquired by the set top box, the elementary streams including at least a stream including encrypted video frames, the encrypted video frames including at least one frame which includes an encrypted access point, and an entitlement control word (ECM) stream, a cache which caches the acquired encrypted video frames, an ECM acquired by the set top box from the ECM stream, a control word (CW) derived by the set top box from the ECM, a decryptor which decrypts the cached acquired encrypted video frames according to the CW, a locator which locates the at least one decrypted access point in the cached video stream, a video decoder which de
  • FIG. 1 is a simplified partly pictorial partly block diagram illustration of a system for fast channel zapping constructed and operative in accordance with an embodiment of the present invention
  • Fig. 2 is a simplified block diagram illustration of the operation of the system of Fig. 1 in an MPEG environment
  • Fig. 3 is a simplified flowchart of the method of operation of the system of Fig. 2;
  • Fig. 4 is a graphical representation depicting a plot of time from PID filter set up until the first I-frame is acquired vs. time until the decoding of the video has caught up with the real time broadcast, with the system of Fig. 1 utilized, and in the absence of the system of Fig. 1;
  • Fig. 5 is a graphical representation similar to Fig. 4, utilizing a less conservative estimate of burst time
  • Fig. 6 is a simplified flowchart of methods of operation of the present invention.
  • Fig. 1 is a simplified partly pictorial partly block diagram illustration of a system for fast channel zapping constructed and operative in accordance with an embodiment of the present invention.
  • the system of Fig. 1 comprises a video transport stream 10, the video transport stream comprising transport stream associated metadata 15 and elementary streams comprising a video stream 20 and an entitlement control word (ECM) stream 30.
  • ECM entitlement control word
  • the system of Fig. 1 further comprises a set top box (STB) 40, the STB 40 comprising a cache 50, a decryptor 60 and a decoder 70.
  • STB 40 comprises standard hardware components and software components, as is known in the art.
  • the STB 40 may comprise a personal video recorder (PVR), also known in the art as a digital video recorder (DVR).
  • PVR personal video recorder
  • DVR digital video recorder
  • a video headend 80 broadcasts the transport stream 10 comprising the video stream 20, the ECM stream, and the transport stream associated metadata 15.
  • the STB 40 acquires the transport stream 10.
  • the transport stream associated metadata 15 comprises pointers to the elementary streams.
  • particular transport stream associated metadata 15 directs the STB 40 to locate particular packets in the video transport stream 10, the particular packets being packets comprising encrypted video frames 21a, 21b, ..., 2 Ix comprised in the video stream 20 for the particular content item and packets comprising ECMs 31a, 31b, ..., 3 Ix in an associated ECM stream 30.
  • the ECMs comprising the associated ECM elementary stream 30 comprise ECMs required for decryption of the encrypted video frames 21a, 21b, ..., 21x.
  • the decryption of the encrypted video frames 21a, 21b, ..., 21x may comprise partial decryption.
  • some video standards comprise plain text indicators as to where encrypted access points are located in the transport stream 10. In such a case, decryption would begin at the located access point, and possibly only some of the following frames would be decrypted.
  • the plain text indicators can be used to indicate the access point or a recovery point, in standards which support recovery points.
  • the encrypted video frames 21a, 21b, ..., 21x are stored in the cache 50.
  • a control word (CW) 90 is derived from one ECM 31b, being an ECM associated with the cached acquired encrypted video frames 21a, 21b, ..., 2 Ix.
  • the control word 90 is sent to the decryptor 60 and is used to decrypt the cached acquired encrypted video frames 21a, 21b, ..., 2 Ix.
  • the decrypted video frames 121a, 121b, ..., 121x are sent to the decoder 70.
  • the term decoder is used in its conventional use in the art to refer to a video decompressor.
  • the decoder 70 decodes the decrypted video frames 121a, 121b, ..., 121x beginning at an access point.
  • the decoded decrypted video frames 221a, 221b, ..., 221x are sent to a video display 230 for displaying. It is appreciated that in the operation of system of Fig. 1, as described above, the decrypting, the decoding and the displaying are all performed at speeds better than real-time. It is anticipated that by performing the decrypting, the decoding and the displaying at speeds better than real-time, the displaying of the video will eventually catch up with the real time broadcast. Alternatively, any one of the decrypting and the decoding may occur at better than real-time, while the displaying may occur at real-time.
  • the decoding of the decrypted video frames 121a, 121b, ..., 121x may comprise partial decoding.
  • some or all decrypted bi-directional picture or equivalent frames may not be decoded, as discussed below.
  • the access point mentioned above comprises any frame after which the video stream can be decoded without reference to other frames.
  • access points comprise intra-coded frames (I-frames), Instantaneous Decoding Refresh frames (IDR- frames), or equivalent frames.
  • I-frames intra-coded frames
  • IDR- frames Instantaneous Decoding Refresh frames
  • a recovery point may also comprise an access point.
  • the access point mentioned above may also comprise a frame and a count where the video stream can be decoded and displayed without reference to other frames after "count" frames beyond the access point frame.
  • the frame from which decoding can begin may be of any type (for example and without limiting the generality of the foregoing, an MPEG-2 I-frame, or a bi-directionally predicted frame in H.264 comprising a progressive I-slice).
  • some frames may be suitable for displaying as they have been completely decoded whereas other frames may not be suitable for displaying as some of the information required for decoding such frames is based on frames that have not been received.
  • One method to perform the decrypting, the decoding and the displaying at speeds better than real-time comprises not displaying every decrypted and decoded bi-directional picture frames (B-frames), or the equivalent frames that are not required as input to decoding other frames.
  • B-frames may be decrypted
  • the decrypted B-frames may not be decoded.
  • the B-frames which are not decoded comprise B-frames which are associated with content items and not with advertisements.
  • the B-frames which are not decoded may comprise B-frames which are associated with advertisements and not with content items.
  • a first I-frame after the access point may be displayed, and no change of display may occur until the decoding of the video has caught up with the real time broadcast.
  • the implementation of this invention may result in a video stream being displayed slightly behind or slightly ahead of the normal expected display time, as encoded in the video.
  • the stream can be adjusted either to the correct display time using the better-than real time mechanisms described above, or, alternatively, using the well-known technique of displaying all of the frames, at a slightly faster than real-time rate.
  • some video encoding systems support self-decodable frames (e.g. I-frames) that are not access points, i.e. such frames do not allow the decoding of all the following frames up until the next access point.
  • I-frames self-decodable frames
  • one I-frame followed by a second intra-coded frame I-frame would comprise an I-frame which is not an access point.
  • a somewhat more complex example of an I-frame which is not an access point is where the I-frame is used for decoding some of the images following the I-frame, but not many, and it is not sufficient to enter the video stream.
  • Such a case might be a "pop" video which has a sequence of fast cuts between scenes Sl, S2 and back to Sl .
  • Sl starts with an I-frame from which all the frames in both portions of Sl are predicted
  • S2 starts with an I-frame from which all the frames in Sl are predicted.
  • the I-frame beginning Sl is an access point, but the I-frame beginning S2 is not, since the "back to Sl" stream requires the I-frame that occurred at the start of the first Sl segment.
  • Such frames that occurred before the access point may be ignored, while those after the access point would be handled as described above.
  • video encoding is sometimes performed with a "long GOP" structure, which means that there is a large gap between access points.
  • an access point has not been cached by the time the control word is available. In such cases, it may be desirable to decode and display any such I-frames received in advance of the access point.
  • Fig. 2 is a simplified block diagram illustration of the operation of the system of Fig. 1 in an MPEG environment
  • Fig. 3 is a simplified flowchart of the method of operation of the system of Fig. 2.
  • the method and system depicted in Figs. 2 and 3 are intended to illustrate one embodiment of the present invention.
  • the method and system depicted in Figs. 2 and 3 are by way of example only, and do not limit the generality of the foregoing description of Fig. 1.
  • the general description of Fig. 1 applies, without recourse to the system and method depicted in Figs. 2 and 3.
  • the STB 40 acquires the stream of metadata 15.
  • the stream of metadata 15 comprises a Program Association Table (PAT) 310 and a Program Map Table (PMT) 320. Additionally, the STB 40 acquires the video stream 20 and the ECM stream 30. Having acquired the PAT 310, the STB 40 is able to locate the PMT 320 in the metadata stream and acquire the PMT 320. Having acquired the PMT 320, the STB 40 is able to locate the particular content item desired and to begin acquiring elementary streams comprising the video elementary stream 20 and the ECM stream 30. The STB 40 acquires the ECM 31b from the ECM stream, the ECM 31b being associated with the desired particular content item. The ECM 31b is utilized by the STB 40 in order to derive the control word 90.
  • PAT Program Association Table
  • PMT Program Map Table
  • the STB 40 also acquires video frames 21a, 21b, ..., 21x from the elementary video stream 20.
  • the STB 40 caches video frames 21a, 21b, ..., 21x in the cache 50.
  • the STB 40 sends the control word 90 and the cached video frames 21a, 21b, ..., 21x to the decryptor 60.
  • the control word 90 is derived from the ECM 31b. Deriving the control word 90 from the ECM 31b is a time-consuming process, involving cryptographic calculations.
  • the decryptor 60 produces decrypted compressed video frames, as described above, with reference to Fig. 1.
  • the STB 40 determines which of the decrypted compressed video frames is the first decrypted compressed video frames comprising an access point. Beginning with the first decrypted compressed video frames comprising one of an access point and a recovery point, the decrypted compressed video frames are sent to the decoder 70, which decodes the decrypted compressed video frames, thereby producing decrypted decoded video frames, as described above, with reference to Fig. 1. As described above, with reference to Fig. 1 , the decrypted decoded video frames can be sent to the display 230 for displaying.
  • Fig. 4 is a graphical representation depicting a plot of time from PID filter set up until the first I-frame is acquired vs. time until the decoding of the video has caught up with the real time broadcast, with the system of Fig. 1 utilized, and in the absence of the system of Fig. 1.
  • the abscissa of Fig. 4 is denoted as "I-frame time”.
  • I-frame time is defined as a time from PID filter set up until the first I-frame is acquired.
  • the ordinate of Fig. 4 is denoted as "Decode time" which is defined as the time from acquisition of the video frames until decoding can start.
  • Fig. 4 and Fig. 5 utilizes MPEG-2 terminology, for example and without limiting the generality of the foregoing, describing the access point as an I-frame. It is appreciated that the discussion of Fig. 4 and Fig. 5 can be adapted appropriately for other video standards, such as H.264 and VC-I .
  • Burst time - a time required for the decoder 70 (Fig. 1) to processed cached content and catch up to a live broadcast.
  • Burst time also includes decoder and stream specific overhead, such as, and not limited to, time required for hardware setup, and software overhead, as is known in the art.
  • burst time is assumed to be 50 milliseconds.
  • Control Word (CW) time - a time required to acquire an ECM 31a, 31b, ..., 31x (Fig. 1) and produce a control word 90 (Fig. 1) from the ECM 31a, 31b, ..., 31x (Fig. 1).
  • CW time is assumed to be 300 milliseconds. Those skilled in the art will appreciate that CW time in a typical STB varies from about 200 - 400 milliseconds.
  • GOP time - a time between starts of groups of pictures (GOPs).
  • GOP time is assumed to be 500 milliseconds, since the GOP time for DVB is 500 milliseconds.
  • Fig. 4, and Fig. 5 below are described in MPEG-2 terminology. Accordingly, those skilled in the art will appreciate that the GOP discussed herein is a closed GOP, that is, a GOP beginning with an access point. As described above, the present invention is operable in systems which allow either a closed GOP or an open GOP.
  • Fig. 4 depicts two lines: a first (solid) line with I-frame caching (that is to say, implementing an embodiment of the present invention). Specifically, with caching
  • I-frame time I-frame time.
  • I-frame time is statistically evenly distributed over the indicated I-frame time between 0 to GOP time. That is to say, someone who tunes to the transport stream 10 (Fig. 1) is as likely to have any one I-frame time between 0 to GOP time as any other I-frame time between 0 to GOP time.
  • burst time is the time required for the decoder 70 (Fig. 1) to processed cached content and catch up to a live broadcast.
  • burst time is set to 5 milliseconds.
  • I-frame time is statistically evenly distributed over the indicated I-frame time between 0 to GOP time. That is to say, someone who tunes to the transport stream 10 (Fig. 1) is as likely to have any one I-frame time between 0 to GOP time as any other I-frame time between 0 to GOP time.
  • Fig. 6 is a simplified flowchart of methods of operation of the present invention.
  • the method of Fig. 6 is believed to be self-explanatory in light of the above discussion.
  • software components of the present invention may, if desired, be implemented in ROM (read only memory) form.
  • the software components may, generally, be implemented in hardware, if desired, using conventional techniques.
  • the software components may be instantiated, for example: as a computer program product; on a tangible medium; or as a signal interpretable by an appropriate computer.

Abstract

L'invention concerne un procédé et un système pour accorder un boîtier décodeur (STB) sur une fréquence porteuse, la fréquence porteuse transportant un flux de transport, pour acquérir un sous-ensemble de métadonnées associées au flux de transport, le sous-ensemble de métadonnées associées au flux de transport comprenant une pluralité de pointeurs vers une pluralité de flux élémentaires, la pluralité de flux élémentaires comprenant des données et des métadonnées associées à un élément de contenu désiré, pour acquérir la pluralité de flux élémentaires indiqués dans le sous-ensemble de métadonnées associées au flux de transport, la pluralité de flux élémentaires comprenant au moins un premier flux comprenant des images vidéo cryptées, les images vidéo cryptées comprenant au moins une image qui comprend un point d'accès crypté, et un second flux comprenant un flux de messages de commande d'accès (ECM), pour mettre en mémoire cache les images vidéo cryptées acquises à partir du premier flux, pour acquérir un ECM à partir du second flux, l'ECM acquis étant associé aux images vidéo cryptées acquises mises en mémoire cache, pour obtenir un mot de commande (CW) à partir de l’ECM acquis, pour décrypter les images vidéo cryptées acquises mises en mémoire cache selon le CW, pour localiser le ou les points d'accès décryptés dans le premier flux, pour décrypter des images vidéo cryptées incluses dans le premier flux mis en mémoire cache, pour décoder les images vidéo décryptées à partir du ou des points d'accès décryptés et pour afficher les images vidéo décryptées décodées incluses dans le premier flux, en commençant au niveau du ou des points d'accès décryptés localisés, le décryptage, le décodage et l'affichage étant effectués plus rapidement qu'en temps réel. L'invention concerne également des systèmes et des procédés correspondants.
PCT/IB2008/053180 2008-08-07 2008-08-07 Zapping de chaîne rapide WO2010015882A1 (fr)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2012176118A1 (fr) 2011-06-22 2012-12-27 Nds Limited Changement rapide de service
US8925030B2 (en) 2011-07-18 2014-12-30 Cisco Technology Inc. Fast channel change via a mosaic channel

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