Expway

Institut Mines-telecom

Eexpway

Cédric Thienot

Claude Seyrat

Jean Le Feuvre

Romain Lahore-Carraté

Tuan Tran Thai

Christophe Burdinat

David Lambert

Gwenael Durand

Romain Lahore-CarratÉ

A method for multicasting multimedia content to receivers, the method comprising: receiving, by a multicast middleware (MCMF) from a server (BMS), manifest files to access contents according to different adaptive bitrate streaming communication protocols, one of the manifest files being consistent with the MPEG-DASH protocol and describing media segments of a content, another of the manifest files being a master playlist consistent with the HLS protocol and defining locations where media playlists to access the media segments of the content are available; receiving, by the middleware from the server, the media segments of the content, transmitted in a multicast session, receiving, by the middleware from the server, the playlists, the received playlists referencing the media segments transmitted in the multicast session, and currently received by the middleware; and storing by the middleware the manifest files, the media segments and the playlists, to make them available to receivers (UD, UD, UD).

Method for broadcasting DASH/HLS hybrid multimedia streams

A method for accessing a service delivering content from a user terminal includes: transmitting a Uniform Resource Locator to a client module of the terminal, the URL including an identifier of a requested content and a command specifying a request or condition related to delivery to the user terminal of the requested content, if the requested content is available in the user terminal according to the specified condition, receiving the requested content from the client module, and if the requested content is not available in the user terminal according to the specified condition, transmitting the URL to a service broadcasting server.

Method for transmitting content to mobile user devices

A method of retrieving a file, the method including: receiving a portion of a content transmitted in accordance with a multicast protocol via a file delivery service, wherein the content includes data fragments forming a file; receiving a file delivery table (FDT) from the file delivery service; reading in the file delivery table location attributes indicating locations of the data fragments in the file; and determining from the location attributes locations of non-corrupted data fragments in the content portion.

Method of handling packet losses in transmissions based on DASH standard and FLUTE protocol

A method for playing back an item of multimedia content by user devices, the method including steps of: receiving segments of an item of multimedia content by a server, storing the received segments in a buffer memory, transmitting a segment request from a multimedia player of a user device to the server, and transmitting, in response, a requested segment from the server to the multimedia player, if the segment is present in the buffer memory, transmitting a request for synchronization data from the multimedia player to the server, and transmitting, in response to the request, synchronization data from the server to the multimedia player, the data including an identifier of a last segment received, and a datum defining the time of receipt of the last segment by the user's device.

Method of synchronization during the processing, by a multimedia player, of an item of multimedia content transmitted by an MBMS service

The invention concerns a method for compressing and decompressing a structured document, associated with at least a tree diagram structure defining a document structure and comprising nested structure elements, associated with a type of information, and representing sets of data, the method comprising steps which consists in: performing a syntactic analysis of the structure diagram and standardizing it so as to obtain a single predefined sequence of the elements of the diagram; compiling the standardized diagram to obtain finite automata, each automaton comprising states interconnected by transitions respectively representing the elements of the structure; and compressing the document, and executing at least a compression algorithm associated with a type of information, when a set of data having the type of information is encountered in the document.

Method for compressing/decompressing structure documents

A method for encoding a group of several structured fragments includes analyzing structure schemas of the fragments in order to obtain sequences of executable instructions for each component of the schemas. The instruction sequences are executed on the structured fragments so as to obtain an encoded binary stream containing the control codes and the information elements values of the fragments. The values of the information elements of the fragments in data blocks are distributed as a function of the respective types of the elements. The respective positions in the structure block are stored in a pointer table for each fragment and in the data blocks of the control codes and the information element values of the fragment. Compression algorithms are applied to the blocks adapted to the contents thereof, and the contents of the pointer table and data blocks are concatenated into an encoded binary container.

Method for compressing and decompressing structured documents

The method applies to a structured document presenting a hierarchical structure defined by a structure schema, the document combining a main structured set of information including information subsets at least some of the information subsets being structured and being capable of including information subsets of lower hierarchical level, each information subset being associated in the higher level information set with a respective information type. The method includes: dividing the document into structured portions capable of being handled individually, namely a main portion and at least one secondary portion, the main portion containing at least the main set of information, and the secondary portion containing an information subset which is removed from the main set of information, each secondary portion being attached to the main portion or to another secondary portion; and allocating a predefined value to the information type of each information subset that has been removed from an information set of higher hierarchical level.

Method for dividing structured documents into several parts

An encoding method for enabling a decoder to decode a structured document having a structure defined in a first schema not accessible to the decoder and resulting from a change of a second schema accessible to the decoder, the first schema defining at least one information element which is derived from a corresponding element defined in the second schema, the encoding method comprising the steps of: encoding the document using said first and second schemas into a binary stream comprising for each elements of the document a binary sequence encoding the element, and inserting in the binary sequence encoding the derived element a reference designating the first schema in which the structure of the derived element is defined, said reference designating the first schema being defined in a schema reference list containing references to all schemas used for encoding the document, the schema reference list being made accessible to the decoder.

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Paris, France

Cédric Thienot