EP2077017A1 - Method of memory management in a client terminal, corresponding signal, computer program and terminal - Google Patents

Method of memory management in a client terminal, corresponding signal, computer program and terminal

Info

Publication number
EP2077017A1
EP2077017A1 EP07821398A EP07821398A EP2077017A1 EP 2077017 A1 EP2077017 A1 EP 2077017A1 EP 07821398 A EP07821398 A EP 07821398A EP 07821398 A EP07821398 A EP 07821398A EP 2077017 A1 EP2077017 A1 EP 2077017A1
Authority
EP
European Patent Office
Prior art keywords
scene
multimedia
terminal
multimedia content
memory
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07821398A
Other languages
German (de)
French (fr)
Inventor
Julien Perron
Elouan Le Coq
Jean-Claude Dufourd
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Streamazzo
Streamezzo SA
Original Assignee
Streamazzo
Streamezzo SA
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 Streamazzo, Streamezzo SA filed Critical Streamazzo
Publication of EP2077017A1 publication Critical patent/EP2077017A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio

Definitions

  • Memory management method in a client terminal, signal, computer program and corresponding terminal Memory management method in a client terminal, signal, computer program and corresponding terminal.
  • the field of the invention is that of the reproduction of multimedia content on a radiocommunication terminal, for example of the radiotelephone type, PDA (in English “Personal Digital Assistant", in French “personal digital assistant”), laptop, etc.
  • the invention is based on memory management in such a terminal and the simultaneous reproduction of multimedia content in continuous charging mode, also called "streaming" mode, or in progressive loading mode, in which the consumption of content by the terminal starts before the end of the download of this content.
  • Multimedia content includes a set consisting of at least one animated graphic scene, also called multimedia scene, and a series of commands to change this scene from one state to another.
  • a multimedia scene corresponds in particular to the arrangement of a set of graphic objects in time and in space, with which the user of the radiocommunication terminal can interact.
  • the invention finds applications in all fields requiring a representation of the signals in the form of a spatio-temporal arrangement of graphic objects, with interactivity, and in particular to the domains enabling the client to consume the multimedia scenes in streaming mode, or progressive .
  • a first technique applies to transmissions using the protocol HTTP ("Hyper Text Transport Protocol").
  • HTTP Hyper Text Transport Protocol
  • This communication protocol provides a parameter, at the level of the transport layer, indicating that the transported content must be stored in the communication terminal, called “cache memory”. This setting tells the client terminal that it should keep the cached content for a certain amount of time.
  • a disadvantage of this technique is that the cache storage indication parameter applies to the entire transported content, which is not always necessary, and can lead to unnecessary cache congestion at the expense of data transmitted later. Moreover, this technique also does not allow the terminal to memorize a cache content, while simultaneously rendering it, in streaming mode for example.
  • Another known technique is the insertion in a multimedia scene of another multimedia scene intended to be cached in the radiocommunications terminal. This technique makes it possible to meet the needs of advance transmission of multimedia scenes, intended to be stored for later playback.
  • a disadvantage of this technique is again to require the caching, again, of all the content transmitted.
  • Another disadvantage of this technique is that rendering multimedia content as a sub-scene inserted into a main scene is much more expensive in terms of resources than that of the same content organized as a single scene.
  • the invention particularly aims to overcome these disadvantages of the prior art.
  • an objective of the invention is to provide a technique enabling a client terminal to manage the cache memory, in particular to allow the memorization of a part of a multimedia content only.
  • the invention also aims to enable this memory management while maintaining the restitution mode of continuous or progressive loading of this content.
  • Another object of the invention is to provide such a technique allowing a precise configuration of the memory management in the client terminal, in particular in terms of delimiting the elements of the multimedia content intended to be memorized. in the terminal.
  • the invention aims to provide such a technique having better performance in terms of memory management in the terminal of a portion of a multimedia content and simultaneous reproduction of this content in continuous or progressive loading mode.
  • the invention proposes a new solution that does not have all of these disadvantages of the prior art, in the form of a memory management method in a mobile communication terminal able to process information representative of a scene.
  • such a method comprises the following steps, implemented simultaneously: a step of restoring said scene in continuous loading mode or progressive on said terminal; a step of memorizing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
  • the method according to the invention makes it possible to restore a multimedia scene, in continuous or progressive loading mode, while memorizing pre-identified portions of this scene, in order to be able to restore them later, without making requests to an external server. , but only by retrieving them in the local memory of the terminal.
  • the storage is selective, since only one (or more) part of the content is stored. This operation is carried out simultaneously with the restitution of the scene, without disturbance for it.
  • the storage step is associated with a step of managing a table assigning to an address remote from said portion, in a server, a local address in said memory of said terminal, so that a call to said remote address is systematically transformed into a call to said local address.
  • the terminal implements a correspondence between a remote address, corresponding for example to the access address on a server to the portion of the scene to be stored, and an address in the terminal's local memory.
  • this call to the remote address is in fact transformed into a call to the local address corresponding to the location in memory of the terminal of the portion previously stored (if, of course, this portion has already been transmitted and memorized).
  • the step of storing a pre-identified portion of said multimedia content is implemented according to at least one storage indicator.
  • said storage indicator is associated with a configuration area of the description file of said multimedia scene and is defined by information according to which a pre-identified portion of said multimedia content representative of said scene must be stored in said memory of said terminal. customer or not.
  • This configuration area of the scene description file can be anywhere in the file. It can be for example a file header.
  • this storage indicator allows the determination of the portion of the scene to be memorized, and the terminal, when it recognizes it, knows that it must memorize a portion of the scene, simultaneously with the restitution of the scene.
  • the configuration area of the description file of said multimedia scene further comprises at least one parameter defining a maximum duration of storage of said portion of said multimedia content in the memory of said client terminal.
  • the configuration area of the description file of said multimedia scene further defines at least one of the parameters belonging to the group comprising: an address remote from said portion of said multimedia content stored in said memory of said client terminal; an information according to which said portion of said multimedia content must be stored in said memory of said client terminal, beyond a user session.
  • the configuration zone of the description file also makes it possible to give indications to the terminal concerning the portion to be memorized, specifying the address at which the portion is accessible (for example on a server remote).
  • a parameter of this configuration area may indicate to the terminal if the portion to be memorized must be beyond the user session, for example in the case where the portion of the scene is reusable in d ' other multimedia scenes, the rendering of which may be required in another user session.
  • said storage indicator forms a means of discriminating between at least a portion of said multimedia content of said multimedia scene to be stored in said memory of said client terminal and at least one other portion not having to be .
  • the memory indicator makes it possible to memorize only one portion, or several portions of a multimedia scene, while other portions are not.
  • the terminal knows which portion of the scene should be memorized and which portion should not be memorized.
  • said at least one storage indicator is in the form of a temporal signal determining that the portion of said multimedia scene received before said signal must be memorized while the portion of said multimedia scene received after said signal must be not be memorized. The terminal knows that from the detection of this time indicator it must no longer memorize the rest of the scene.
  • Another aspect of the invention relates to a computer program product downloadable from a communication network and / or stored on a computer readable medium and / or executable by a microprocessor, including program code instructions for implementation. the memory management method of a client terminal as described above.
  • Another aspect of the invention relates to a signal representative of a multimedia scene in the form of a multimedia content comprising a set of multimedia elements, transmitted in continuous loading mode between at least one multimedia scene server terminal and at least one client terminal on which said scene is restored.
  • a signal comprises at least one indicator for storing in said client terminal a portion of said multimedia content representative of said multimedia scene, said indicator being directly interpretable by the memory management method in a terminal.
  • a radiocommunication terminal comprising means for receiving a multimedia scene in the form of a multimedia content comprising multimedia elements.
  • a terminal notably comprises the following means, implemented simultaneously: means for rendering said scene in continuous loading mode on said terminal, means for storing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
  • FIG. 1 illustrates an exemplary memory management method implemented in a client terminal according to a particular embodiment of the invention
  • FIG. 2 presents an example of a description file of a multimedia scene according to a particular embodiment of the invention
  • FIG. 3 shows an example of a part of the simplified structure of a client terminal implementing a memory management technique according to a particular embodiment of the invention.
  • the general principle of the invention relies on the memorization of a portion of a multimedia scene, simultaneously with the rendering of the scene, in a client terminal.
  • the method according to the invention allows the storage of a portion of a multimedia scene without altering the simultaneous reproduction of the same multimedia scene, in continuous or progressive loading mode.
  • FIG. 1 shows an exemplary implementation of the memory management method in a client terminal, according to a particular embodiment of the invention.
  • a multimedia stream, described in accordance with this embodiment of the invention is considered, transmitted by a server to a client terminal.
  • the memory management method firstly comprises a step 10 of reception, by the client terminal, of the multimedia scene transmitted in the stream, and two simultaneous steps, one of rendering the scene in the mode streaming or progressive, the other memorizing 12 a portion of the scene.
  • the storage step 12 is active only when the data being received corresponds to a portion of the scene to be stored.
  • the client terminal detects a storage indicator (described below in connection with Figure 2) for a portion of the scene, it stores the portion in question, while continuing the restitution of the scene.
  • this storage step 12 is associated, according to the present embodiment, with a step 121 of management of an address table, in which a remote address is associated, for example corresponding to the address used for the request to the scene, also called URL ("Uniform Resource Locator" in English), and a local address for memorizing the portion of the scene in the terminal.
  • a remote address is associated, for example corresponding to the address used for the request to the scene, also called URL ("Uniform Resource Locator" in English
  • URL Uniform Resource Locator
  • This rendering of a portion of the scene corresponds to a request, that is to say a call to a remote address, defining the means of accessing the portion in question.
  • the memory management according to this embodiment makes it possible to know, thanks to the address table, whether this portion is stored in the terminal. If this is the case, the terminal retrieves the portion in question in memory, so as to restore it during a step 14 of restitution.
  • the terminal searches, in the address association table previously entered (at moment of the memory of the portion), the local address where the portion is stored.
  • the terminal can locally find the stored portion instead of making a request corresponding to the remote address.
  • the client terminal receives this description file 20 from the scene and processes it so that it can render the scene.
  • a file 20 for describing a multimedia scene comprises a header 21 (or a configuration area placed in the description file), in which parameters are defined allowing, in particular, the terminal of manage portions of the scene in memory.
  • a storage indicator 22 allows the terminal to know if one or more portions of the scene must be memorized or not.
  • the indicator 22 may for example be a Boolean, equal to 1 to indicate a request for storage and equal to 0 otherwise.
  • this indicator whatever its value, can mean a storage request, and consequently the absence of this indicator implies that no storage is required. required.
  • the indicator 22 may be a temporal signal, that is to say transmitted at a certain moment of the transmission of the multimedia scene, indicating that the portion of the scene received by the terminal before this indicator must stored, and the portion received afterwards must not be.
  • this indicator allows the terminal to know if one or more portions of the scene must be stored.
  • the header 21 of the description file 20 also includes an expiry parameter, defining a maximum storage duration 23 of the portion of the scene in the memory of the client terminal.
  • This parameter also called TTL ("Time To Live” in English), makes it possible to define the lifetime in memory in a terminal of a portion of a multimedia scene.
  • a file header or a file configuration area, including a storage flag (specifying a request to store a portion of a multimedia scene), followed by a maximum storage duration. equal to one minute.
  • the client terminal After processing this description file of the scene, and particularly of its header, the client terminal will memorize the portion of the scene in question for one minute, and will release the memory at the end of this minute.
  • the header 21 of the file may also include an address, called remote address 24, corresponding to the means of accessing a portion of the scene for its return.
  • This remote address may correspond for example to the URL used in the request to the scene, that is to say the address to access the server hosting all the data corresponding to the scene.
  • the memory management method implemented in the terminal will store, at the same time as the scene portion considered, the remote address corresponding to the access to this element, and associate it with the local address in the terminal memory. This address association, managed in an address table, allows the terminal to access the portion of scene in memory instead of making a request to the remote address.
  • the remote address parameter does not appear in the header of the file.
  • the terminal can then use the referencing address used to obtain the scene portion to be stored as a local memory address, which will then allow it to find the scene portion locally.
  • This "permanent" parameter may be for example a boolean indicating, when it is equal to 1, that the portion of the scene to be stored must be stored in memory beyond the client session for the maximum storage duration specified in the parameter 23. When it is equal to 0, the terminal knows that the memorized portion should not be kept beyond the client session.
  • this parameter indicates, by its only presence in the header of the file, and whatever its value, that the portion of the stored scene must be kept beyond the user session .
  • This parameter allows the terminal to retain portions of multimedia scene that can be used for the rendering of several different scenes, and thus saves in terms of data transmitted, some data not being transmitted because already stored in the terminal.
  • This "permanent" parameter can also be called “non-transient”.
  • the following parameters can be considered in the header of the description file of the multimedia scene: storage indicator 22: "Cacheable”; maximum storage time 23: “clientCacheTtl”; - parameter 25: "permanent”.
  • Such a client terminal comprises a memory 31 consisting of a buffer memory, a processing unit 32, equipped for example with a microprocessor ⁇ P, and driven by the computer program 33, implementing the memory management method according to the invention.
  • the code instructions of the computer program 33 are for example loaded into a RAM memory before being executed by the processor of the processing unit 32.
  • the processing unit 32 receives as input a stream multimedia device comprising at least one multimedia scene.
  • the microprocessor of the processing unit 32 implements the steps of the memory management method described above, according to the instructions of the computer program 33, for rendering the multimedia scene in a streaming (streaming) or progressive loading mode. and memorize a portion of the scene.
  • the client terminal comprises, in addition to the buffer memory 31, means for rendering the multimedia scene in streaming or progressive mode and means for memorizing a portion of the scene. These means are controlled by the microprocessor of the processing unit 32.
  • the processing unit 32 thus makes it possible simultaneously to restore the scene and to memorize portions of the scene.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Information Transfer Between Computers (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The invention relates to a method of memory management in a mobile communication terminal able to process information representative of a multimedia scene taking the form of a multimedia content comprising multimedia elements, comprising a step (10) of receiving said multimedia scene. According to the invention, such a method comprises the following steps, implemented simultaneously: - a step (11) of restoring said scene in continuous or progressive loading mode on said terminal; - a step (12) of storing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.

Description

Procédé de gestion de mémoire dans un terminal client, signal, programme d'ordinateur et terminal correspondants. Memory management method in a client terminal, signal, computer program and corresponding terminal.
1. Domaine de l'invention1. Field of the invention
Le domaine de l'invention est celui de la restitution de contenus multimédia sur un terminal de radiocommunication, par exemple de type radiotéléphone, PDA (en anglais "Personal Digital Assistant", en français "assistant numérique personnel"), ordinateur portable, etc.The field of the invention is that of the reproduction of multimedia content on a radiocommunication terminal, for example of the radiotelephone type, PDA (in English "Personal Digital Assistant", in French "personal digital assistant"), laptop, etc.
Plus précisément, l'invention repose sur la gestion de mémoire dans un tel terminal et la restitution simultanée de contenus multimédia en mode de chargement continu, encore appelé mode "streaming", ou en mode de chargement progressif, mode dans lequel la consommation du contenu par le terminal débute avant la fin du téléchargement de ce contenu.More specifically, the invention is based on memory management in such a terminal and the simultaneous reproduction of multimedia content in continuous charging mode, also called "streaming" mode, or in progressive loading mode, in which the consumption of content by the terminal starts before the end of the download of this content.
On entend notamment par contenu multimédia un ensemble composé d'au moins une scène graphique animée, encore appelée scène multimédia, et d'une série de commandes permettant de faire évoluer cette scène d'un état à un autre. Une scène multimédia correspond notamment à l'agencement d'un ensemble d'objets graphiques dans le temps et dans l'espace, avec lesquels l'utilisateur du terminal de radiocommunication peut interagir.Multimedia content includes a set consisting of at least one animated graphic scene, also called multimedia scene, and a series of commands to change this scene from one state to another. A multimedia scene corresponds in particular to the arrangement of a set of graphic objects in time and in space, with which the user of the radiocommunication terminal can interact.
L'invention trouve des applications dans tous les domaines nécessitant une représentation des signaux sous forme d'un agencement spatio-temporel d'objets graphiques, avec interactivité, et notamment aux domaines permettant au client de consommer les scènes multimédia en mode streaming, ou progressif.The invention finds applications in all fields requiring a representation of the signals in the form of a spatio-temporal arrangement of graphic objects, with interactivity, and in particular to the domains enabling the client to consume the multimedia scenes in streaming mode, or progressive .
2. Art antérieur2. Prior Art
Des techniques de transmission d'un contenu multimédia vers un terminal de radiocommunication et de restitution d'un tel contenu sur un tel terminal sont déjà connues.Techniques for transmitting multimedia content to a radiocommunication terminal and for rendering such content on such a terminal are already known.
Ces terminaux proposent également des techniques mettant en oeuvre une configuration de gestion de mémoire dans un terminal de radiocommunication existent également. Un première technique s'applique aux transmissions utilisant le protocole de communication HTTP ("Hyper Text Transport Protocol"). Ce protocole de communication prévoit un paramètre, au niveau de la couche transport, indiquant que le contenu transporté doit être mis en mémoire, appelée mémoire "cache", dans le terminal de communication. Ce paramètre indique au terminal client qu'il doit conserver le contenu en question en cache, pour une certaine durée.These terminals also offer techniques implementing a memory management configuration in a radiocommunication terminal also exist. A first technique applies to transmissions using the protocol HTTP ("Hyper Text Transport Protocol"). This communication protocol provides a parameter, at the level of the transport layer, indicating that the transported content must be stored in the communication terminal, called "cache memory". This setting tells the client terminal that it should keep the cached content for a certain amount of time.
Un inconvénient de cette technique est que le paramètre d'indication de mémorisation en cache s'applique à la totalité du contenu transporté, ce qui n'est pas toujours nécessaire, et peut conduire à un encombrement inutile de la mémoire cache, au détriment de données transmises plus tard. De plus, cette technique ne permet pas non plus au terminal de mémoriser un contenu en cache, tout en le restituant simultanément, en mode streaming par exemple.A disadvantage of this technique is that the cache storage indication parameter applies to the entire transported content, which is not always necessary, and can lead to unnecessary cache congestion at the expense of data transmitted later. Moreover, this technique also does not allow the terminal to memorize a cache content, while simultaneously rendering it, in streaming mode for example.
Une autre technique connue est l'insertion dans une scène multimédia d'une autre scène multimédia destinée à être mise en mémoire cache dans le terminal de radiocommunications. Cette technique permet de répondre aux besoins de transmission anticipée de scènes multimédia, destinées à être mémorisées pour une restitution ultérieure.Another known technique is the insertion in a multimedia scene of another multimedia scene intended to be cached in the radiocommunications terminal. This technique makes it possible to meet the needs of advance transmission of multimedia scenes, intended to be stored for later playback.
Un inconvénient de cette technique est encore une fois de nécessiter la mise en cache, là encore, de la totalité du contenu transmis. Un autre inconvénient de cette technique est que le rendu d'un contenu multimédia sous forme d'une sous-scène insérée dans une scène principale est beaucoup plus coûteux en terme de ressources que celui du même contenu organisé sous forme d'une seule scène.A disadvantage of this technique is again to require the caching, again, of all the content transmitted. Another disadvantage of this technique is that rendering multimedia content as a sub-scene inserted into a main scene is much more expensive in terms of resources than that of the same content organized as a single scene.
De plus, un autre inconvénient de cette technique est de ne pas permettre simultanément la restitution et la mise en cache de la sous-scène. En effet, avant d'être restituée, la sous-scène doit être transmise et mise en mémoire cache entièrement.In addition, another disadvantage of this technique is not to simultaneously allow the rendering and caching of the sub-scene. Indeed, before being rendered, the sub-scene must be transmitted and cached entirely.
Enfin, la sous-scène destinée à être mise en cache doit être accompagnée d'une commande indiquant au terminal qu'il doit la restituer après l'avoir chargée entièrement. 3. Objectifs de l'inventionFinally, the sub-scene to be cached must be accompanied by a command indicating to the terminal that it must return it after having fully loaded. 3. Objectives of the invention
L'invention a notamment pour objectif de pallier ces inconvénients de l'art antérieur.The invention particularly aims to overcome these disadvantages of the prior art.
Plus précisément, un objectif de l'invention, selon au moins un mode de réalisation, est de fournir une technique permettant à un terminal client de gérer la mémoire cache, notamment pour permettre la mémorisation d'une partie d'un contenu multimédia seulement.More precisely, an objective of the invention, according to at least one embodiment, is to provide a technique enabling a client terminal to manage the cache memory, in particular to allow the memorization of a part of a multimedia content only.
L'invention a également pour objectif de permettre cette gestion de mémoire tout en conservant la restitution en mode de chargement continu ou progressif de ce contenu.The invention also aims to enable this memory management while maintaining the restitution mode of continuous or progressive loading of this content.
Un autre objectif de l'invention, selon au moins un mode de réalisation, est de fournir une telle technique permettant une configuration précise de la gestion de mémoire dans le terminal client, notamment en termes de délimitation des éléments du contenu multimédia destinés à être mémorisés dans le terminal. Notamment, l'invention a pour objectif de fournir une telle technique présentant de meilleures performances en termes de gestion de mémoire dans le terminal d'une partie d'un contenu multimédia et de restitution simultanée de ce contenu en mode de chargement continu ou progressif.Another object of the invention, according to at least one embodiment, is to provide such a technique allowing a precise configuration of the memory management in the client terminal, in particular in terms of delimiting the elements of the multimedia content intended to be memorized. in the terminal. In particular, the invention aims to provide such a technique having better performance in terms of memory management in the terminal of a portion of a multimedia content and simultaneous reproduction of this content in continuous or progressive loading mode.
Il est à noter que la formulation de ces objectifs repose sur l'identification d'un problème nouveau, non suggéré par l'état de l'art.It should be noted that the formulation of these objectives is based on the identification of a new problem, not suggested by the state of the art.
4. Exposé de l'invention4. Presentation of the invention
L'invention propose une solution nouvelle qui ne présente pas l'ensemble de ces inconvénients de l'art antérieur, sous la forme d'un procédé de gestion de mémoire dans un terminal de communication mobile apte à traiter des informations représentatives d'une scène multimédia se présentant sous la forme d'un contenu multimédia comprenant des éléments multimédia, comprenant une étape de réception de ladite scène multimédia.The invention proposes a new solution that does not have all of these disadvantages of the prior art, in the form of a memory management method in a mobile communication terminal able to process information representative of a scene. multimedia presentation in the form of a multimedia content comprising multimedia elements, comprising a step of receiving said multimedia scene.
Selon l'invention, un tel procédé comprend les étapes suivantes, mises en oeuvre simultanément : - une étape de restitution de ladite scène en mode de chargement continu ou progressif sur ledit terminal ; une étape de mémorisation d'une portion dudit contenu multimédia représentatif de ladite scène multimédia, ladite portion étant préidentifiée dans ledit contenu multimédia. Ainsi, le procédé selon l'invention permet de restituer une scène multimédia, en mode de chargement continu ou progressif, tout en mémorisant des portions pré-identifïées de cette scène, afin de pouvoir les restituer ultérieurement, sans faire de requêtes à un serveur externe, mais uniquement en les récupérant dans la mémoire local du terminal. La mémorisation est sélective, puisque seule une (ou plusieurs) partie du contenu est mémorisée. Cette opération s'effectue simultanément à la restitution de la scène, sans perturbation pour celle-ci.According to the invention, such a method comprises the following steps, implemented simultaneously: a step of restoring said scene in continuous loading mode or progressive on said terminal; a step of memorizing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content. Thus, the method according to the invention makes it possible to restore a multimedia scene, in continuous or progressive loading mode, while memorizing pre-identified portions of this scene, in order to be able to restore them later, without making requests to an external server. , but only by retrieving them in the local memory of the terminal. The storage is selective, since only one (or more) part of the content is stored. This operation is carried out simultaneously with the restitution of the scene, without disturbance for it.
De façon préférentielle, l'étape de mémorisation est associée à une étape de gestion d'une table affectant à une adresse distante de ladite portion, dans un serveur, une adresse locale dans ladite mémoire dudit terminal, de façon qu'un appel à ladite adresse distante soit systématiquement transformé en un appel à ladite adresse locale.Preferably, the storage step is associated with a step of managing a table assigning to an address remote from said portion, in a server, a local address in said memory of said terminal, so that a call to said remote address is systematically transformed into a call to said local address.
De cette façon, le terminal met en oeuvre une correspondance entre une adresse distante, correspondant par exemple à l'adresse d'accès sur un serveur à la portion de la scène à mémoriser, et une adresse en mémoire locale du terminal.In this way, the terminal implements a correspondence between a remote address, corresponding for example to the access address on a server to the portion of the scene to be stored, and an address in the terminal's local memory.
Ainsi, quand le terminal doit restituer une portion de la scène, par exemple suite à une requête de l'utilisateur, cela se traduit classiquement par un appel à l'adresse distante d'accès à la portion en question. Selon l'invention, cet appel à l'adresse distante est en fait transformé en un appel à l'adresse locale correspondant à l'emplacement en mémoire du terminal de la portion préalablement mémorisée (si, bien sûr, cette portion a déjà été transmise et mémorisée).Thus, when the terminal has to restore a portion of the scene, for example following a request from the user, this conventionally results in a call to the remote access address to the portion in question. According to the invention, this call to the remote address is in fact transformed into a call to the local address corresponding to the location in memory of the terminal of the portion previously stored (if, of course, this portion has already been transmitted and memorized).
Selon un aspect particulier de l'invention, l'étape de mémorisation d'une portion pré-identifïée dudit contenu multimédia est mise en oeuvre en fonction d'au moins un indicateur de mémorisation. Avantageusement, ledit un indicateur de mémorisation est associé à une zone de configuration du fichier de description de ladite scène multimédia et est défini par une information selon laquelle une portion pré-identifîée dudit contenu multimédia représentatif de ladite scène doit être stockée dans ladite mémoire dudit terminal client ou non.According to a particular aspect of the invention, the step of storing a pre-identified portion of said multimedia content is implemented according to at least one storage indicator. Advantageously, said storage indicator is associated with a configuration area of the description file of said multimedia scene and is defined by information according to which a pre-identified portion of said multimedia content representative of said scene must be stored in said memory of said terminal. customer or not.
Cette zone de configuration du fichier de description de la scène peut se situer à n'importe quel emplacement du fichier. Il peut s'agir par exemple d'un entête de fichier.This configuration area of the scene description file can be anywhere in the file. It can be for example a file header.
Ainsi, cet indicateur de mémorisation permet la détermination de la portion de scène à mémoriser, et le terminal, quand il le reconnaît, sait qu'il doit mémoriser une portion de scène, simultanément à la restitution de la scène.Thus, this storage indicator allows the determination of the portion of the scene to be memorized, and the terminal, when it recognizes it, knows that it must memorize a portion of the scene, simultaneously with the restitution of the scene.
En particulier, la zone de configuration du fichier de description de ladite scène multimédia comprend en outre au moins un paramètre définissant une durée maximum de stockage de ladite portion dudit contenu multimédia dans la mémoire dudit terminal client.In particular, the configuration area of the description file of said multimedia scene further comprises at least one parameter defining a maximum duration of storage of said portion of said multimedia content in the memory of said client terminal.
Ce paramètre permet ainsi au terminal de savoir la durée pendant laquelle il doit conserver en mémoire la portion de scène, ce qui permet une meilleure gestion de la mémoire, en libérant l'espace occupé par une portion de scène comme spécifié par ce paramètre de péremption. De façon préférentielle, la zone de configuration du fichier de description de ladite scène multimédia définit en outre au moins un des paramètres appartenant au groupe comprenant : une adresse distante de ladite portion dudit contenu multimédia stockée dans ladite mémoire dudit terminal client; - une information selon laquelle ladite portion dudit contenu multimédia doit être stockée dans ladite mémoire dudit terminal client, au-delà d'une session utilisateur.This parameter thus enables the terminal to know the time during which it must keep in memory the portion of scene, which allows a better management of the memory, by freeing the space occupied by a portion of scene as specified by this parameter of expiry . Preferably, the configuration area of the description file of said multimedia scene further defines at least one of the parameters belonging to the group comprising: an address remote from said portion of said multimedia content stored in said memory of said client terminal; an information according to which said portion of said multimedia content must be stored in said memory of said client terminal, beyond a user session.
Ainsi, la zone de configuration du fichier de description permet également de donner des indications au terminal concernant la portion à mémoriser, en précisant l'adresse à laquelle la portion est accessible (par exemple sur un serveur distant).Thus, the configuration zone of the description file also makes it possible to give indications to the terminal concerning the portion to be memorized, specifying the address at which the portion is accessible (for example on a server remote).
De plus, un paramètre de cette zone de configuration peut permettre d'indiquer au terminal si la portion à mémoriser doit l'être au-delà de la session utilisateur, par exemple dans le cas où la portion de la scène est réutilisable dans d'autres scènes multimédia, dont la restitution peut être requise dans une autre session utilisateur.In addition, a parameter of this configuration area may indicate to the terminal if the portion to be memorized must be beyond the user session, for example in the case where the portion of the scene is reusable in d ' other multimedia scenes, the rendering of which may be required in another user session.
Selon un aspect particulier de l'invention, ledit indicateur de mémorisation forme moyen de discrimination entre au moins une portion dudit contenu multimédia de ladite scène multimédia devant être stockée dans ladite mémoire dudit terminal client et au moins une autre portion ne devant pas l'être.According to one particular aspect of the invention, said storage indicator forms a means of discriminating between at least a portion of said multimedia content of said multimedia scene to be stored in said memory of said client terminal and at least one other portion not having to be .
Ainsi, l'indicateur de mémoire permet de ne mémoriser qu'une portion, ou plusieurs portions d'une scène multimédia, alors que d'autres portions ne le sont pas. Grâce à cet indicateur, le terminal sait quelle portion de la scène doit être mémoriser et quelle portion ne doit pas l'être. De façon préférentielle, ledit au moins un indicateur de mémorisation se présente sous la forme d'un signal temporel déterminant que la portion de ladite scène multimédia reçue avant ledit signal doit être mémorisée alors que la portion de ladite scène multimédia reçue après ledit signal ne doit pas être mémorisée. Le terminal sait qu'à partir de la détection de cet indicateur temporel il ne doit plus mémoriser le reste de la scène.Thus, the memory indicator makes it possible to memorize only one portion, or several portions of a multimedia scene, while other portions are not. With this indicator, the terminal knows which portion of the scene should be memorized and which portion should not be memorized. Preferably, said at least one storage indicator is in the form of a temporal signal determining that the portion of said multimedia scene received before said signal must be memorized while the portion of said multimedia scene received after said signal must be not be memorized. The terminal knows that from the detection of this time indicator it must no longer memorize the rest of the scene.
Un autre aspect de l'invention concerne un produit programme d'ordinateur téléchargeable depuis un réseau de communication et/ou stocké sur un support lisible par ordinateur et/ou exécutable par un microprocesseur, comprenant des instructions de code de programme pour la mise en œuvre du procédé de gestion de mémoire d'un terminal client tel que décrit ci-dessus.Another aspect of the invention relates to a computer program product downloadable from a communication network and / or stored on a computer readable medium and / or executable by a microprocessor, including program code instructions for implementation. the memory management method of a client terminal as described above.
Un autre aspect de l'invention concerne un signal représentatif d'une scène multimédia se présentant sous la forme d'un contenu multimédia comprenant un ensemble d'éléments multimédia, transmise en mode de chargement continu entre au moins un terminal serveur de scènes multimédia et au moins un terminal client sur lequel ladite scène est restituée. Un tel signal comprend au moins un indicateur de mémorisation dans ledit terminal client, d'une portion dudit contenu multimédia représentatif de ladite scène multimédia, ledit indicateur étant directement interprétable par le procédé de gestion de mémoire dans un terminal.Another aspect of the invention relates to a signal representative of a multimedia scene in the form of a multimedia content comprising a set of multimedia elements, transmitted in continuous loading mode between at least one multimedia scene server terminal and at least one client terminal on which said scene is restored. Such a signal comprises at least one indicator for storing in said client terminal a portion of said multimedia content representative of said multimedia scene, said indicator being directly interpretable by the memory management method in a terminal.
Finalement, un autre aspect de l'invention concerne un terminal de radiocommunication comprenant des moyens de réception d'une scène multimédia se présentant sous la forme d'un contenu multimédia comprenant des éléments multimédia. Un tel terminal comprend notamment les moyens suivants, mis en oeuvre simultanément : des moyens de restitution de ladite scène en mode de chargement continu sur ledit terminal, des moyens de mémorisation d'une portion dudit contenu multimédia représentatif de ladite scène multimédia, ladite portion étant préidentifiée dans ledit contenu multimédia.Finally, another aspect of the invention relates to a radiocommunication terminal comprising means for receiving a multimedia scene in the form of a multimedia content comprising multimedia elements. Such a terminal notably comprises the following means, implemented simultaneously: means for rendering said scene in continuous loading mode on said terminal, means for storing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
5. Liste des figures D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante d'un mode de réalisation particulier, donné à titre de simple exemple illustratif et non limitatif, et des dessins annexés, parmi lesquels : la figure 1 illustre un exemple de procédé de gestion de mémoire mis en oeuvre dans un terminal client selon un mode de réalisation particulier de l'invention ; la figure 2 présente un exemple de fichier de description d'une scène multimédia selon un mode de réalisation particulier de l'invention ; la figure 3 présente un exemple d'une partie de la structure simplifiée d'un terminal client mettant en œuvre une technique de gestion de mémoire selon un mode de réalisation particulier de l'invention.5. List of Figures Other features and advantages of the invention will appear more clearly on reading the following description of a particular embodiment, given as a simple illustrative and nonlimiting example, and the accompanying drawings, among which: FIG. 1 illustrates an exemplary memory management method implemented in a client terminal according to a particular embodiment of the invention; FIG. 2 presents an example of a description file of a multimedia scene according to a particular embodiment of the invention; FIG. 3 shows an example of a part of the simplified structure of a client terminal implementing a memory management technique according to a particular embodiment of the invention.
6. Description d'un mode de réalisation de l'invention6. Description of an embodiment of the invention
Le principe général de l'invention repose sur la mémorisation d'une portion d'une scène multimédia, simultanément à la restitution de la scène, dans un terminal client. Ainsi, le procédé selon l'invention permet la mise en mémoire d'une portion d'une scène multimédia sans altérer la restitution simultanée de la même scène multimédia, en mode de chargement continu ou progressif.The general principle of the invention relies on the memorization of a portion of a multimedia scene, simultaneously with the rendering of the scene, in a client terminal. Thus, the method according to the invention allows the storage of a portion of a multimedia scene without altering the simultaneous reproduction of the same multimedia scene, in continuous or progressive loading mode.
On présente, en relation avec la figure 1, un exemple de mise en oeuvre du procédé de gestion de mémoire dans un terminal client, selon un mode de réalisation particulier de l'invention.FIG. 1 shows an exemplary implementation of the memory management method in a client terminal, according to a particular embodiment of the invention.
On considère un flux multimédia, décrit conformément à ce mode de réalisation de l'invention (voir plus loin la description de la figure 2), transmis par un serveur à un terminal client. Le procédé de gestion de mémoire selon l'invention comprend d'abord une étape 10 de réception, par le terminal client, de la scène multimédia transmise dans le flux, et deux étapes simultanées, l'une de restitution 11 de la scène en mode streaming ou progressif, l'autre de mémorisation 12 d'une portion de la scène. Bien sûr, l'étape de mémorisation 12 n'est active que lorsque les données en cours de réception correspondent à une portion de la scène devant être stockée. Ainsi, quand le terminal client détecte un indicateur de mise en mémoire (décrit plus loin en relation avec la figure 2) pour une portion de la scène, il mémorise la portion en question, tout en poursuivant la restitution de la scène.A multimedia stream, described in accordance with this embodiment of the invention (see below the description of FIG. 2), is considered, transmitted by a server to a client terminal. The memory management method according to the invention firstly comprises a step 10 of reception, by the client terminal, of the multimedia scene transmitted in the stream, and two simultaneous steps, one of rendering the scene in the mode streaming or progressive, the other memorizing 12 a portion of the scene. Of course, the storage step 12 is active only when the data being received corresponds to a portion of the scene to be stored. Thus, when the client terminal detects a storage indicator (described below in connection with Figure 2) for a portion of the scene, it stores the portion in question, while continuing the restitution of the scene.
Pour l'utilisateur, cette étape de mémorisation n'est pas visible et n'interfère pas avec la restitution. Au contraire, la mémorisation de certaines portions de la scène permet une meilleure gestion d'une scène multimédia au sein du terminal, en utilisant les portions mémorisées localement au lieu d'aller les chercher sur un serveur à chaque fois que la scène en a besoin, et donc une réduction des données transmises et une meilleure fluidité dans l'évolution d'une scène multimédia. Cette étape 12 de mémorisation est associée, selon le présent mode de réalisation, à une étape 121 de gestion d'une table d'adresses, dans laquelle sont associées une adresse distante, pouvant correspondre par exemple à l'adresse utilisée pour la requête à la scène, encore appelée URL ("Uniform Resource Locator" en anglais), et une adresse locale de mémorisation de la portion de la scène dans le terminal. On considère, au cours de la restitution de la scène en mode streaming, ou en mode progressif, une portion de la scène devant être restituée à un instant donné, par exemple suite à une action de l'utilisateur.For the user, this storage step is not visible and does not interfere with the playback. On the contrary, the memorization of certain portions of the scene allows a better management of a multimedia scene within the terminal, by using the locally stored portions instead of picking them up on a server whenever the scene needs it. , and therefore a reduction of the transmitted data and a better fluidity in the evolution of a multimedia scene. This storage step 12 is associated, according to the present embodiment, with a step 121 of management of an address table, in which a remote address is associated, for example corresponding to the address used for the request to the scene, also called URL ("Uniform Resource Locator" in English), and a local address for memorizing the portion of the scene in the terminal. During the rendering of the scene in streaming mode, or in progressive mode, it is considered a portion of the scene to be restored at a given moment, for example following an action by the user.
Cette restitution d'une portion de la scène correspond à une requête, c'est- à-dire un appel 13 à une adresse distante, définissant le moyen d'accéder à la portion en question.This rendering of a portion of the scene corresponds to a request, that is to say a call to a remote address, defining the means of accessing the portion in question.
La gestion de mémoire selon ce mode de réalisation permet de savoir, grâce à la table d'adresses, si cette portion est mémorisée dans le terminal. Si tel est le cas, le terminal récupère la portion en question en mémoire, de façon à la restituer lors d'une étape 14 de restitution.The memory management according to this embodiment makes it possible to know, thanks to the address table, whether this portion is stored in the terminal. If this is the case, the terminal retrieves the portion in question in memory, so as to restore it during a step 14 of restitution.
Pour récupérer en mémoire la portion de la scène correspondant à l'appel 13 d'une adresse distante, par exemple l'URL de la requête à la scène, le terminal recherche, dans la table d'association d'adresses préalablement renseignée (au moment de la mémoire de la portion), l'adresse locale où la portion est mémorisée. Ainsi, le terminal peut retrouver localement la portion mémorisée au lieu d'effectuer une requête correspondant à l'adresse distante.To recover in memory the portion of the scene corresponding to the call 13 of a remote address, for example the URL of the request to the scene, the terminal searches, in the address association table previously entered (at moment of the memory of the portion), the local address where the portion is stored. Thus, the terminal can locally find the stored portion instead of making a request corresponding to the remote address.
Plus précisément, on présente maintenant, en relation avec la figure 2, les paramètres de description d'une scène multimédia permettant au terminal de gérer des portions de scène en mémoire, dans le présent mode de réalisation. On considère une scène multimédia décrite dans un fichier de descriptionMore specifically, the description parameters of a multimedia scene enabling the terminal to manage scene portions in memory in the present embodiment are now presented in relation to FIG. 2. We consider a multimedia scene described in a description file
20, lui-même transmis d'un serveur vers un terminal client. Le terminal client reçoit ce fichier de description 20 de la scène et le traite de manière à pouvoir restituer la scène.20, itself transmitted from a server to a client terminal. The client terminal receives this description file 20 from the scene and processes it so that it can render the scene.
Selon ce mode de mise en œuvre particulier, un fichier 20 de description d'une scène multimédia comprend un en-tête 21 (ou une zone de configuration placée dans le fichier de description), dans lequel sont définis des paramètres permettant notamment au terminal de gérer des portions de scène en mémoire.According to this particular embodiment, a file 20 for describing a multimedia scene comprises a header 21 (or a configuration area placed in the description file), in which parameters are defined allowing, in particular, the terminal of manage portions of the scene in memory.
Notamment, un indicateur de mémorisation 22 permet au terminal de savoir si une ou plusieurs portions de la scène doivent être mémorisées ou non. Ainsi, l'indicateur 22 peut par exemple être un booléen, égal à 1 pour indiquer une demande de mise en mémoire et égal à O dans le cas contraire.In particular, a storage indicator 22 allows the terminal to know if one or more portions of the scene must be memorized or not. Thus, the indicator 22 may for example be a Boolean, equal to 1 to indicate a request for storage and equal to 0 otherwise.
Selon une variante de ce mode de mise en œuvre, la seule présence de cet indicateur, quelle que soit sa valeur, peut signifier une requête de mise en mémoire, et par conséquent l'absence de cet indicateur implique qu'aucune mémorisation n'est requise.According to a variant of this implementation mode, the mere presence of this indicator, whatever its value, can mean a storage request, and consequently the absence of this indicator implies that no storage is required. required.
Dans une autre variante, l'indicateur 22 peut être un signal temporel, c'est- à-dire transmis à un certain moment de la transmission de la scène multimédia, indiquant que la portion de la scène reçue par le terminal avant cet indicateur doit être mise en mémoire, et la portion reçue après ne doit pas l'être. D'une manière générale, cet indicateur permet au terminal de savoir si une ou plusieurs portions de la scène doivent être mises en mémoire.In another variant, the indicator 22 may be a temporal signal, that is to say transmitted at a certain moment of the transmission of the multimedia scene, indicating that the portion of the scene received by the terminal before this indicator must stored, and the portion received afterwards must not be. In general, this indicator allows the terminal to know if one or more portions of the scene must be stored.
L'en-tête 21 du fichier de description 20 comprend également un paramètre de péremption, définissant une durée maximale de stockage 23 de la portion de la scène dans la mémoire du terminal client. Ce paramètre, encore appelé TTL ("Time To Live" en anglais), permet de définir la durée de vie en mémoire dans un terminal d'une portion d'une scène multimédia.The header 21 of the description file 20 also includes an expiry parameter, defining a maximum storage duration 23 of the portion of the scene in the memory of the client terminal. This parameter, also called TTL ("Time To Live" in English), makes it possible to define the lifetime in memory in a terminal of a portion of a multimedia scene.
Par exemple, on considère un en-tête de fichier, ou une zone de configuration de fichier, comprenant un indicateur de mémorisation (spécifiant une demande de mémorisation d'une portion d'une scène multimédia), suivi d'une durée maximale de stockage égale à une minute.For example, consider a file header, or a file configuration area, including a storage flag (specifying a request to store a portion of a multimedia scene), followed by a maximum storage duration. equal to one minute.
Après traitement de ce fichier de description de la scène, et particulièrement de son en-tête, le terminal client va mémoriser la portion de scène en question pendant une minute, et va libérer la mémoire à la fin de cette minute.After processing this description file of the scene, and particularly of its header, the client terminal will memorize the portion of the scene in question for one minute, and will release the memory at the end of this minute.
L'en-tête 21 du fichier peut également comprendre une adresse, appelée adresse distante 24, correspondant au moyen d'accéder à une portion de la scène pour sa restitution. Cette adresse distante peut correspondre par exemple à l'URL utilisée dans la requête à la scène, c'est-à-dire l'adresse permettant d'accéder au serveur hébergeant toutes les données correspondant à la scène. Dans le cas de cet exemple, le procédé de gestion de mémoire mis en oeuvre dans le terminal va mémoriser, en même temps que la portion de scène considérée, l'adresse distante correspondant à l'accès à cet élément, et lui associer l'adresse locale dans la mémoire du terminal. Cette association d'adresse, gérée dans une table d'adresses, permet au terminal d'accéder à la portion de scène en mémoire au lieu de faire une requête à l'adresse distante.The header 21 of the file may also include an address, called remote address 24, corresponding to the means of accessing a portion of the scene for its return. This remote address may correspond for example to the URL used in the request to the scene, that is to say the address to access the server hosting all the data corresponding to the scene. In the case of this example, the memory management method implemented in the terminal will store, at the same time as the scene portion considered, the remote address corresponding to the access to this element, and associate it with the local address in the terminal memory. This address association, managed in an address table, allows the terminal to access the portion of scene in memory instead of making a request to the remote address.
Selon une variante de ce mode de réalisation particulier de l'invention, le paramètre d'adresse distante ne figure pas dans l'en-tête du fichier. Le terminal peut alors se servir de l'adresse de référencement utilisée pour obtenir la portion de scène à mémoriser comme adresse de mémoire locale, qui lui permettra ensuite de retrouver localement la portion de scène.According to a variant of this particular embodiment of the invention, the remote address parameter does not appear in the header of the file. The terminal can then use the referencing address used to obtain the scene portion to be stored as a local memory address, which will then allow it to find the scene portion locally.
On considère maintenant un autre paramètre 25, nommé "permanent", de l'en-tête du fichier, permettant d'indiquer au terminal que la ou les portions de la scène à mémoriser doivent être conservées en mémoire au-delà de la session client.We now consider another parameter 25, named "permanent", of the file header, to indicate to the terminal that the portion or portions of the scene to be stored must be stored in memory beyond the client session .
Ce paramètre "permanent" peut être par exemple un booléen indiquant, quand il est égal à 1, que la portion de la scène à mettre en mémoire doit être conservée en mémoire au-delà de la session client pendant la durée maximale de stockage spécifiée dans le paramètre 23. Quand il est égal à 0, le terminal sait que la portion mémorisée ne doit pas être conservée au-delà de la session client.This "permanent" parameter may be for example a boolean indicating, when it is equal to 1, that the portion of the scene to be stored must be stored in memory beyond the client session for the maximum storage duration specified in the parameter 23. When it is equal to 0, the terminal knows that the memorized portion should not be kept beyond the client session.
Selon une variante, on peut prévoir que ce paramètre 25 indique, par sa seule présence dans l'en-tête du fichier, et quelle que soit sa valeur, que la portion de la scène mémorisée doit être conservée au-delà de la session utilisateur. Ce paramètre permet au terminal de conserver des portions de scène multimédia pouvant servir à la restitution de plusieurs scènes différentes, et permet ainsi des économies en terme de données transmises, certaines données n'étant pas retransmises car déjà en mémoire dans le terminal.According to one variant, it can be provided that this parameter indicates, by its only presence in the header of the file, and whatever its value, that the portion of the stored scene must be kept beyond the user session . This parameter allows the terminal to retain portions of multimedia scene that can be used for the rendering of several different scenes, and thus saves in terms of data transmitted, some data not being transmitted because already stored in the terminal.
Ce paramètre « permanent » peut également être appelé « non transient ». Selon un exemple de mise en oeuvre du procédé de gestion de mémoire, on peut considérer les paramètres suivants dans l'en-tête du fichier de description de la scène multimédia : indicateur de mémorisation 22 : "Cacheable" ; durée maximale de stockage 23 : "clientCacheTtl" ; - paramètre 25 : "permanent".This "permanent" parameter can also be called "non-transient". According to an exemplary implementation of the memory management method, the following parameters can be considered in the header of the description file of the multimedia scene: storage indicator 22: "Cacheable"; maximum storage time 23: "clientCacheTtl"; - parameter 25: "permanent".
On peut obtenir alors l'exemple suivant d'un en-tête du fichier de description : <header cacheable="true" clientCacheTtl="lmn" permanent="true"/>We can then get the following example of a description file header: <header cacheable = "true" clientCacheTtl = "lmn" permanent = "true" />
On présente finalement, en relation avec la figure 3, une partie de la structure simplifiée d'un terminal client mettant en œuvre une technique de gestion de mémoire selon le mode de réalisation particulier décrit ci-dessus.Finally, in connection with FIG. 3, a part of the simplified structure of a client terminal implementing a memory management technique according to the particular embodiment described above is presented.
Un tel terminal client comprend une mémoire 31 constituée d'une mémoire tampon, une unité de traitement 32, équipée par exemple d'un microprocesseur μP, et pilotée par le programme d'ordinateur 33, mettant en œuvre le procédé de gestion de mémoire selon l'invention.Such a client terminal comprises a memory 31 consisting of a buffer memory, a processing unit 32, equipped for example with a microprocessor μP, and driven by the computer program 33, implementing the memory management method according to the invention.
A l'initialisation, les instructions de code du programme d'ordinateur 33 sont par exemple chargées dans une mémoire RAM avant d'être exécutées par le processeur de l'unité de traitement 32. L'unité de traitement 32 reçoit en entrée un flux multimédia comprenant au moins une scène multimédia. Le microprocesseur de l'unité de traitement 32 met en œuvre les étapes du procédé de gestion de mémoire décrit précédemment, selon les instructions du programme d'ordinateur 33, pour restituer la scène multimédia en mode de chargement continu ("streaming") ou progressif et mémoriser une portion de la scène. Pour cela, le terminal client comprend, outre la mémoire tampon 31, des moyens de restitution de la scène multimédia en mode streaming ou progressif et des moyens de mémorisation d'une portion de la scène. Ces moyens sont pilotés par le microprocesseur de l'unité de traitement 32.At initialization, the code instructions of the computer program 33 are for example loaded into a RAM memory before being executed by the processor of the processing unit 32. The processing unit 32 receives as input a stream multimedia device comprising at least one multimedia scene. The microprocessor of the processing unit 32 implements the steps of the memory management method described above, according to the instructions of the computer program 33, for rendering the multimedia scene in a streaming (streaming) or progressive loading mode. and memorize a portion of the scene. For this, the client terminal comprises, in addition to the buffer memory 31, means for rendering the multimedia scene in streaming or progressive mode and means for memorizing a portion of the scene. These means are controlled by the microprocessor of the processing unit 32.
L'unité de traitement 32 permet donc, simultanément, la restitution de la scène et la mémorisation de portions de la scène. The processing unit 32 thus makes it possible simultaneously to restore the scene and to memorize portions of the scene.

Claims

REVENDICATIONS
1. Procédé de gestion de mémoire dans un terminal de communication mobile apte à traiter des informations représentatives d'une scène multimédia se présentant sous la forme d'un contenu multimédia comprenant des éléments multimédia, comprenant une étape de réception (10) de ladite scène multimédia, caractérisé en ce qu'il comprend les étapes suivantes, mises en oeuvre simultanément : une étape de restitution (11) de ladite scène en mode de chargement continu ou progressif sur ledit terminal ; - une étape de mémorisation (12) d'une portion dudit contenu multimédia représentatif de ladite scène multimédia, ladite portion étant pré-identifîée dans ledit contenu multimédia.A memory management method in a mobile communication terminal adapted to process information representative of a multimedia scene in the form of multimedia content comprising multimedia elements, comprising a step of receiving said scene multimedia, characterized in that it comprises the following steps, implemented simultaneously: a step of restitution (11) of said scene in continuous or progressive loading mode on said terminal; a step of memorizing (12) a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
2. Procédé selon la revendication 1, caractérisé en ce que ladite étape de mémorisation est associée à une étape de gestion d'une table affectant à une adresse distante de ladite portion, dans un serveur, une adresse locale dans ladite mémoire dudit terminal, de façon qu'un appel à ladite adresse distante soit systématiquement transformé en un appel à ladite adresse locale.2. Method according to claim 1, characterized in that said storage step is associated with a step of managing a table assigning to an address remote from said portion, in a server, a local address in said memory of said terminal, way a call to said remote address is systematically transformed into a call to said local address.
3. Procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce que ladite étape de mémorisation d'une portion pré-identifiée dudit contenu multimédia est mise en oeuvre en fonction d'au moins un indicateur de mémorisation.3. Method according to any one of claims 1 and 2, characterized in that said step of storing a pre-identified portion of said multimedia content is implemented according to at least one storage indicator.
4. Procédé selon la revendication 3, caractérisé en ce que ledit au moins un indicateur de mémorisation est associé à une zone de configuration du fichier de description de ladite scène multimédia et est défini par une information selon laquelle une portion pré-identifîée dudit contenu multimédia représentatif de ladite scène doit être stockée dans ladite mémoire dudit terminal client ou non.4. Method according to claim 3, characterized in that said at least one storage indicator is associated with a configuration area of the description file of said multimedia scene and is defined by information according to which a pre-identified portion of said multimedia content representative of said scene must be stored in said memory of said client terminal or not.
5. Procédé selon la revendication 4, caractérisé en ce que ladite zone de configuration du fichier de description de ladite scène multimédia comprend en outre au moins un paramètre définissant une durée maximum de stockage de ladite portion dudit contenu multimédia dans ladite mémoire dudit terminal client. 5. Method according to claim 4, characterized in that said configuration area of the description file of said multimedia scene further comprises at least one parameter defining a maximum duration of storage of said portion of said multimedia content in said memory of said client terminal.
6. Procédé selon l'une quelconque des revendications 4 et 5, caractérisé en ladite zone de configuration du fichier de description de ladite scène multimédia définit en outre au moins un des paramètres appartenant au groupe comprenant : une adresse distante de ladite portion dudit contenu multimédia stockée dans ladite mémoire dudit terminal client; une information selon laquelle ladite portion dudit contenu multimédia doit être stockée dans ladite mémoire dudit terminal client, au-delà d'une session utilisateur.6. Method according to any one of claims 4 and 5, characterized in said configuration area of the description file of said multimedia scene further defines at least one of the parameters belonging to the group comprising: an address remote from said portion of said multimedia content stored in said memory of said client terminal; an information according to which said portion of said multimedia content must be stored in said memory of said client terminal, beyond a user session.
7. Procédé selon l'une quelconque des revendications 3 à 6, caractérisé en ce que ledit au moins un indicateur de mémorisation forme moyen de discrimination entre au moins une portion dudit contenu multimédia de ladite scène multimédia devant être stockée dans ladite mémoire dudit terminal client et au moins une autre portion ne devant pas l'être.7. Method according to any one of claims 3 to 6, characterized in that said at least one storage indicator forms a means of discrimination between at least a portion of said multimedia content of said multimedia scene to be stored in said memory of said client terminal and at least one other portion not to be.
8. Procédé selon l'une quelconque des revendications 3 à 7, caractérisé en ce ledit au moins un indicateur de mémorisation se présente sous la forme d'un signal temporel déterminant que la portion de ladite scène multimédia reçue avant ledit signal doit être mémorisée alors que la portion de ladite scène multimédia reçue après ledit signal ne doit pas être mémorisée.8. Method according to any one of claims 3 to 7, characterized in that said at least one storage indicator is in the form of a temporal signal determining that the portion of said multimedia scene received before said signal must be stored then that the portion of said multimedia scene received after said signal should not be stored.
9. Produit programme d'ordinateur téléchargeable depuis un réseau de communication et/ou stocké sur un support lisible par ordinateur et/ou exécutable par un microprocesseur, caractérisé en ce qu'il comprend des instructions de code de programme pour la mise en œuvre du procédé de gestion d'un terminal client, selon l'une quelconque des revendications 1 à 8, lorsqu'il est exécuté sur un ordinateur. 9. Computer program product downloadable from a communication network and / or stored on a computer readable medium and / or executable by a microprocessor, characterized in that it comprises program code instructions for the implementation of the method of managing a client terminal, according to any one of claims 1 to 8, when it is executed on a computer.
10. Signal représentatif d'une scène multimédia se présentant sous la forme d'un contenu multimédia comprenant un ensemble d'éléments multimédia, transmise en mode de chargement continu entre au moins un terminal serveur de scènes multimédia et au moins un terminal client sur lequel ladite scène est restituée, caractérisé en ce qu'il comprend au moins un indicateur de mémorisation dans ledit terminal client, d'une portion dudit contenu multimédia représentatif de ladite scène multimédia, ledit indicateur étant directement interprétable par le procédé de gestion de mémoire dans un terminal selon l'une quelconque des revendications 1 à 8. 10. Signal representative of a multimedia scene in the form of a multimedia content comprising a set of multimedia elements, transmitted in a continuous loading mode between at least one multimedia scene server terminal and at least one client terminal on which said scene is restored, characterized in that it comprises at least one memory indicator in said client terminal, a portion of said multimedia content representative of said multimedia scene, said indicator being directly interpretable by the memory management method in a terminal according to any one of claims 1 to 8.
11. Terminal de radiocommunication comprenant des moyens de réception d'une scène multimédia se présentant sous la forme d'un contenu multimédia comprenant des éléments multimédia, caractérisé en ce qu'il comprend les moyens suivants, mis en oeuvre simultanément : - des moyens de restitution de ladite scène en mode de chargement continu sur ledit terminal, des moyens de mémorisation d'une portion dudit contenu multimédia représentatif de ladite scène multimédia, ladite portion étant préidentifiée dans ledit contenu multimédia. 11. A radiocommunication terminal comprising means for receiving a multimedia scene in the form of a multimedia content comprising multimedia elements, characterized in that it comprises the following means, implemented simultaneously: rendering said scene in continuous charging mode on said terminal, means for storing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
EP07821398A 2006-10-18 2007-10-16 Method of memory management in a client terminal, corresponding signal, computer program and terminal Withdrawn EP2077017A1 (en)

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FR0609144A FR2907625B1 (en) 2006-10-18 2006-10-18 METHOD FOR MEMORY MANAGEMENT IN CLIENT TERMINAL, COMPUTER PROGRAM SIGNAL AND CORRESPONDING TERMINAL
PCT/EP2007/061032 WO2008046827A1 (en) 2006-10-18 2007-10-16 Method of memory management in a client terminal, corresponding signal, computer program and terminal

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US8527885B2 (en) 2013-09-03
WO2008046827A1 (en) 2008-04-24
CN101529855B (en) 2014-05-07

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