WO2002087223A1 - Procede et dispositif de traitement des donnees d'un flux multiplexe - Google Patents
Procede et dispositif de traitement des donnees d'un flux multiplexe Download PDFInfo
- Publication number
- WO2002087223A1 WO2002087223A1 PCT/FR2002/001332 FR0201332W WO02087223A1 WO 2002087223 A1 WO2002087223 A1 WO 2002087223A1 FR 0201332 W FR0201332 W FR 0201332W WO 02087223 A1 WO02087223 A1 WO 02087223A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- filtering
- identifier
- context
- packet
- Prior art date
Links
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
- H04N21/43—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
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
Definitions
- the present invention relates to a method and a device for processing the data of a multiplex stream.
- the invention will find its application particularly for filtering data received in the context of digital broadcasting, for example digital television transmission, in particular by satellite.
- it allows the filtering of data received in multiplexed form, for example in the standardized MPEG format.
- the stream received by a remote receiver is multiplexed, namely that the data is organized in packets each provided with an identifier making it possible to recognize the type of data that they contain and particularly the channel that they represent. .
- document FR-A-2,743,245 discloses a demultiplexing device comprising means for storing data of a multiplex stream, programmable means for storing data filters, means of comparison between the data of the multiplex stream and the data filters thus obtained means for transferring the data of the multiplex stream to storage means according to the comparisons carried out.
- This demultiplexing device is complex and has a plurality of filtering processors.
- the present invention relates to a method and a device for processing data of a particularly advantageous multiplex stream.
- a single filtering processor is used for all of the filtering steps to be executed on the different types of packets contained in the flow, according to their identifier commonly called Channel identifier, Channel being in the sense of data flow and not TV channel.
- the identifier is a number which describes to which source the data of the packet belongs, the source being for example in the case of digital television, audio, video or information data. Consequently, the invention considerably reduces the structural heaviness of the filtering circuit which hitherto included as many filters as types of packets.
- Another advantage of the invention is to ensure continuous processing of the multiplex signal with intermediate storage and the possibility of marking filtered data enabling them to be identified for later use.
- Another object of the invention is to combine a structural arrangement (hardware) and software (software) in an advantageous manner.
- the processor virtually executes several programs simultaneously, the passage from one program to another being automatically conditioned by the identifier of each packet with which the incoming data is associated.
- the filters are no longer treated in isolation but, advantageously, all the filters linked to a packet identifier are compiled in a tree-like fashion which makes it possible to deduce a filtering program executed in an optimized manner by the multitasking processor.
- the present invention relates to a method for processing the data of a multiplex stream in which the data is organized in packets provided with an identifier making it possible to describe to which source the data which they contain belongs, said method comprising a step of filtering the data, characterized by the fact c) that a correspondence table is established associating each identifier with a processing context, d) that for each incoming packet:
- the filtered data with the preceding context is stored in a FIFO register of the first in first out type and a FIFO register pointer is associated with them;
- the filtering parameters of each processing context include one or more filters, each having the characteristics of filtering data, mask and length;
- - filtering is carried out by organizing the filters in a tree structure, the common elements of the filters being grouped on the same branch.
- the invention also relates to a device for processing the data of a multiplex stream in which the data is organized in packets provided with an identifier corresponding to the type of data which they contain, said device comprising means for filtering data, suitable to be implemented by the method characterized in that it comprises: means for storing a correspondence table associating each identifier with a processing context,
- a filtering processor associated with a memory containing the filtering parameters included in each processing context
- the means for storing the filtered data consist of a FIFO register of the first in first out type, the pointers of which are associated with the filtered data according to their context;
- It includes a marker to add to the filtered data marking data of the identifier of the packet to which they belong and of the filter used for their filtering;
- - the multiplex stream is a digital broadcast stream; - the multiplex stream is a digital television stream.
- FIG. 1 is a block diagram representative of the constituent elements of the present invention.
- Figure 2 is an example of the context filter tree.
- a multiplex stream is composed of data packets, each provided with an identifier generally called Channel ID allowing the source of data contained in the packet to be known.
- each packet corresponds to a television channel.
- the packets contained in the multiplex stream are filtered.
- the device according to the invention allows the processing and in particular the filtering necessary for this purpose.
- the incoming multiplex stream is marked with the arrow
- This stream is received at the level of a controller identified 2 performing a step of recognizing the identifier of the incoming packet.
- the controller 2 is for example a component such as ASIC or FPGA.
- the controller 2 integrates a battery 2a of the first in first out type.
- Channel ID recognition Any common means of Channel ID recognition can be used at this level.
- Channel ID is called the identifier of a packet and context the set of processing parameters to be carried out, including the necessary filtering parameters relating to a determined Channel ID (i.e. a type of package).
- Each Channel ID that is to say each type of packet, corresponds to a television program channel for an application on digital television.
- the controller 2 further comprises a correspondence table 2c constituted by a memory of a current type associated with the detection means 2b.
- table 2c provides a correspondence between the identity of the Channel ID and a context to be applied for further processing.
- a context change signal S is sent for this purpose as shown diagrammatically in FIG. 1 in the direction of the blocks 3, 4 and 5 shown.
- the context change signal indicating the new context to be used is received at the block formed by the filtering processor 3.
- the processor 3 contains in its associated memory the filtering parameters included in each processing context. On reception of the signal S, the processor is able to recover from its memory the filtering parameters corresponding to the context to be applied.
- the memory dedicated to the processor (which will commonly be a random access memory RAM) is used both for storing contexts and for storing filtering programs.
- the processor 3 executes the program corresponding to the context by means of a suitable set of instructions.
- the processor registers are saved in the memory dedicated to the processor.
- the processor uses a payload start signal to reset its program counter if the packet corresponding to the modification of the context contains the start of the payload.
- It also contains an internal counter which makes it possible to know the number of bytes remaining in the data to be filtered.
- the device Downstream of the filtering processor, the device according to the invention comprises a FIFO 4 register (first in first out) itself also indexed to the context thanks to the context change signal s received during the controller 2 .
- the FIFO register 4 contains a random access random access memory (RAM) allowing the storage of data organized in FIFO. Furthermore, pointers to the FIFO register 4 are associated when the context changes with the data contained in the memory.
- RAM random access random access memory
- the FIFO register 4 will store the data during the match period (match period) of the filter before sending it to the next block or deleting it.
- the next block is the marker marked 5 in Figure 1.
- the marker 5 adds to the filtered data marking data corresponding to the packet identifier (Channel ID) to which they belong as well as a marking of the filter used for their filtering.
- the filtered data can be used by an operating device of a current type and in particular a direct access memory.
- the packet When it enters, the packet is recognized by the detection means 2b which withdraw information as to the Channel ID of the packet. Depending on the Channel ID, the controller 2 associates a context with it according to a correspondence table 2c.
- the controller 2 returns the output of the data stream with a regulated rate as well as information as to the context, revealed by a signal s for changing the context.
- the memory associated with a filtering processor 3 updates the filtering program according to the instructions relating to the context to be applied.
- New filtering parameters are therefore used by processor 3.
- the program implemented for each context by the filtering processor 3 can be presented as follows.
- a limited set of instructions can be used, however it allows all the necessary filtering to be carried out.
- a register contains the current byte coming from the stream which will be used for the comparison operated by the filtering.
- the program stops and resumes at the beginning, at the end of the current section.
- the filters to be created for each of the Channel IDs are organized in a particular way.
- the corresponding computer coding for the program can be structured as follows, for example: Start:
- An optimized filtering step is therefore obtained using at the hardware level a single filtering processor but capable of implementing several filtering parameters according to the Channel ID associated with the packets.
- Controller 2a FIFO stack
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/475,123 US20040151185A1 (en) | 2001-04-19 | 2002-04-18 | Method and device for processing multiplexed flow data |
EP02727672A EP1380160A1 (fr) | 2001-04-19 | 2002-04-18 | Procede et dispositif de traitement des donnees d'un flux multiplexe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0105280A FR2823926B1 (fr) | 2001-04-19 | 2001-04-19 | Procede et dispositif de traitement des donnees d'un flux multiplexe |
FR01/05280 | 2001-04-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002087223A1 true WO2002087223A1 (fr) | 2002-10-31 |
Family
ID=8862458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001332 WO2002087223A1 (fr) | 2001-04-19 | 2002-04-18 | Procede et dispositif de traitement des donnees d'un flux multiplexe |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040151185A1 (fr) |
EP (1) | EP1380160A1 (fr) |
FR (1) | FR2823926B1 (fr) |
WO (1) | WO2002087223A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040133669A1 (en) * | 2001-11-28 | 2004-07-08 | Esa Jalonen | Event or polling driven DVB-T filter detection |
US7512084B2 (en) * | 2001-11-28 | 2009-03-31 | Nokia Corporation | Event driven filter monitoring for IP multicast services |
US20050013274A1 (en) * | 2003-03-05 | 2005-01-20 | Harri Pekonen | System and method for data transmission and reception |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0939546A1 (fr) * | 1998-01-30 | 1999-09-01 | STMicroelectronics Limited | Filtrage de données numériques |
EP0999679A2 (fr) * | 1998-08-31 | 2000-05-10 | Matsushita Electric Industrial Co., Ltd. | Appareil pour le filtrage de paquets qui applique à chaque paquet plusieurs conditions de filtrage avec différent comparisons |
FR2785755A1 (fr) * | 1998-11-09 | 2000-05-12 | Sagem | Procede de restitution de donnees de datagrammes encapsules dans des paquets de transport et recepteur pour la mise en oeuvre du procede |
WO2000028739A1 (fr) * | 1998-11-10 | 2000-05-18 | Open Tv, Inc. | Systeme et procede de filtrage d'informations |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6275507B1 (en) * | 1997-09-26 | 2001-08-14 | International Business Machines Corporation | Transport demultiplexor for an MPEG-2 compliant data stream |
JP3189889B2 (ja) * | 1998-02-20 | 2001-07-16 | 日本電気株式会社 | Pidフィルタ回路 |
US7133400B1 (en) * | 1998-08-07 | 2006-11-07 | Intel Corporation | System and method for filtering data |
US6438145B1 (en) * | 1998-12-04 | 2002-08-20 | Koninklijke Philips Electronics N.V. | Transport packet distribution system and method using local header |
IT1308484B1 (it) * | 1999-05-13 | 2001-12-17 | Cselt Centro Studi Lab Telecom | Apparecchiatura per la rimultiplazione di flussi audiovisivinumerizzati |
US6643298B1 (en) * | 1999-11-23 | 2003-11-04 | International Business Machines Corporation | Method and apparatus for MPEG-2 program ID re-mapping for multiplexing several programs into a single transport stream |
EP1258144A1 (fr) * | 1999-12-14 | 2002-11-20 | General Instrument Corporation | Configuration dynamique de parametres de filtrage d'entree pour un remultiplexeur mpeg |
US6944154B2 (en) * | 2000-12-06 | 2005-09-13 | International Business Machines Corporation | System and method for remultiplexing of a filtered transport stream with new content in real-time |
-
2001
- 2001-04-19 FR FR0105280A patent/FR2823926B1/fr not_active Expired - Fee Related
-
2002
- 2002-04-18 US US10/475,123 patent/US20040151185A1/en not_active Abandoned
- 2002-04-18 EP EP02727672A patent/EP1380160A1/fr not_active Withdrawn
- 2002-04-18 WO PCT/FR2002/001332 patent/WO2002087223A1/fr not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0939546A1 (fr) * | 1998-01-30 | 1999-09-01 | STMicroelectronics Limited | Filtrage de données numériques |
EP0999679A2 (fr) * | 1998-08-31 | 2000-05-10 | Matsushita Electric Industrial Co., Ltd. | Appareil pour le filtrage de paquets qui applique à chaque paquet plusieurs conditions de filtrage avec différent comparisons |
FR2785755A1 (fr) * | 1998-11-09 | 2000-05-12 | Sagem | Procede de restitution de donnees de datagrammes encapsules dans des paquets de transport et recepteur pour la mise en oeuvre du procede |
WO2000028739A1 (fr) * | 1998-11-10 | 2000-05-18 | Open Tv, Inc. | Systeme et procede de filtrage d'informations |
Also Published As
Publication number | Publication date |
---|---|
US20040151185A1 (en) | 2004-08-05 |
EP1380160A1 (fr) | 2004-01-14 |
FR2823926A1 (fr) | 2002-10-25 |
FR2823926B1 (fr) | 2004-06-04 |
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