EP1433328A1 - Method for converting a video and/or audio data flow - Google Patents

Method for converting a video and/or audio data flow

Info

Publication number
EP1433328A1
EP1433328A1 EP02762220A EP02762220A EP1433328A1 EP 1433328 A1 EP1433328 A1 EP 1433328A1 EP 02762220 A EP02762220 A EP 02762220A EP 02762220 A EP02762220 A EP 02762220A EP 1433328 A1 EP1433328 A1 EP 1433328A1
Authority
EP
European Patent Office
Prior art keywords
program
dvd
compatible
stream
mpeg
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.)
Ceased
Application number
EP02762220A
Other languages
German (de)
French (fr)
Inventor
Alexander Romanowski
Stephan Lietz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1433328A1 publication Critical patent/EP1433328A1/en
Ceased legal-status Critical Current

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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H04N21/440209—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display for formatting on an optical medium, e.g. DVD
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/20—Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards

Definitions

  • the invention is based on a method for converting a digital compressed video and / or audio transport stream, in particular according to the MPEG-2 standard, as used, for example, in a digital broadcasting system.
  • MPEG transcoders are known for converting MPEG transport streams, which disassemble, process and reassemble the MPEG transport stream in another form, for example after modification of control bits or a conversion of the bit rate.
  • EP 11 04 198 AI describes such an MPEG transcoder.
  • DE 199 08 488 AI discloses a method in which the packets of the desired program are selected from a DVD / MPEG transport stream via the PIDs.
  • claims 1 or 5 show a method / device with which it is possible to generate a digital, compressed video and / or audio transport stream, in particular an MPEG-2 transport stream, such as is used, for example, in digital
  • DVD Broadcasting systems
  • DMB Broadcasting systems
  • a terminal device that only has a basic functionality, for example a networked MPEG display, which was originally only used to play back DVD data was designed over a local network ' .
  • program-accompanying, in particular program-specific, information or other data describing the content of the transport stream e.g. easily convert DVB service information into a DVD-compatible MPEG-2 program stream.
  • the information accompanying the program some of which are known as "private streams" and part of an MPEG-2
  • Transport stream or MPEG-2 program stream can differ greatly in their structure.
  • DVB compatibility can be achieved here in any case.
  • MOST Multimedia buses in motor vehicles
  • DMB digital broadcasting systems
  • the invention makes it possible to provide the MOST MPEG displays only with the required basic functionality (here DVD-compatible MPEG-2 program stream decoding) and to implement further functionalities in the signal source.
  • the format of the MPEG2 program stream resulting from the conversion according to the invention corresponds completely to a program stream output by a networked DVD player.
  • DVD playback device DVD player
  • the actual source is then only signaled in a higher-level protocol by the identifiers of the individual connected in the network
  • the advantage of the method according to the invention lies in particular in the fact that expanding a networked DVD player to transport stream-based content (digital broadcasting) would only mean additional effort on the source side (receiving module), but not on the sink side (MPEG display) , Since there will generally be more sinks (displays) than signal sources (receiver modules) in such a networked system, there is significant potential for cost reduction.
  • the program-accompanying information for example MPEG-PSI and DVG-SI, which are part of the received MPEG-2 transport stream, processed in such a way that they can be embedded in the resulting MPEG-2 program stream in a DVD-compatible manner, eg as subpictures. If necessary, the audio and / or video data must also be converted into a format corresponding to the DVD specifications.
  • FIG. 1 shows a block diagram of a device for converting an MPEG-2 transport stream
  • FIG. 2 shows a block diagram of a menu generator '
  • 3 shows a bus with connected devices.
  • the method according to the invention is used to convert the digitally compressed video and / or audio transport data stream, in particular according to the MPEG-2 standard, into a DVD-compatible program stream. Both video and / or audio data and program-accompanying, in particular program-describing, data can be converted.
  • the conversion is carried out on the basis of the MP ⁇ G-2 system specification by breaking down the MPEG-2 transport stream into individual audio and video PES streams (Packetised Elementary Streams), according to FIG. 1 by means of multiplexer 1, and their subsequent multiplexing using multiplexer 2 into one valid MPEG-2 program stream.
  • the audio data contained in the MPEG-2 transport stream can differ in sampling rate, word length and compression algorithm from that of a DVD-typical program stream. Therefore, an additional adaptation stage - format converter 3 - for audio data may be necessary here before the formation of the program stream.
  • This audio data like the video data, is processed at the PES packet level.
  • the information accompanying the program or describing the program (MPEG-PSI, DVB-SI) in the transport stream is separated by means of the multiplexer 3 and converted in such a way that it can also be multiplexed into the resulting program stream using multiplexer 2 in accordance with the DVD specification.
  • MPEG-2 transport streams also contain additional information describing the program.
  • An example of such program-describing information is the EPG (Electronic program guide) in DVB transmissions.
  • This data originally transmitted in the transport stream must be able to be visualized or processed in a DVD-compatible manner in the display unit in the terminal. This is only possible in a DVD compliant way if it is as
  • Presentation Control Information or "Sub-pictures” are multiplexed into the corresponding MPEG-2 program stream.
  • this data is converted into a DVD-compatible data stream by a so-called menu generator 4. If program-descriptive information is to be displayed at the user's request, the Menu generator 4 from these DVD-compatible menus and feeds them with the program stream into the network or system.
  • the menu generator 4 is also for part of the
  • the control of the modules required for the conversion - menu generator 4 and multiplexer 3 - is carried out on the basis of user input (user control information 8) via the control unit 5 and device-specific
  • the permitted user inputs are part of the interactions permitted for DVD playback.
  • the control unit 5 controls the assemblies 1, 2, 3, 4, 9 and 10.
  • a separate signaling channel for controlling the menu generator 4 is advantageously provided from at least one DVD-compatible terminal.
  • the menu generator 4 generates two DVD-compatible bit streams 6 and 7, namely a bit stream 6 consisting of bit maps according to the MPEG-2 standard and a further bit stream 7 for playback control, in particular for generating selection menus for the
  • FIG. 1 shows yet another multiplexer 9 on the input side, which is provided in particular to separate overhead information, e.g. for the interaction with the multiplexer 2.
  • the structure of the menu generator 4 is shown in FIG. 2.
  • This menu generator 4 has the task of converting the program-accompanying information contained in an MPEG-2 transport stream into DVD-compatible sub-pictures.
  • This is the MPEG-PSI (Program Specific Information), which are present in every MPEG-2 transport stream and around system-specific information of the transport stream source such as DVB-SI (DVB-System Information) or EPG (Electronic Program Guide), which are only used in certain systems and are partly optional.
  • MPEG-PSI Program Specific Information
  • DVB-SI DVD-System Information
  • EPG Electronic Program Guide
  • the sub-pictures on a DVD always consist of 16-color bitmaps. These bitmaps must be compressed and packed in sub-picture units.
  • the sub-picture units consist of a header and a display control sequence table. This table describes changes in the appearance of the bitmap during the display, e.g. Color and contrast.
  • DVD-compliant presentation control information can also be generated. These include, among other things, the highlight information, with which individual parts of the overall picture can be deposited with different colors. This makes it possible to select menus, e.g. for the selection of a specific language or a specific program.
  • the highlight information generated is transmitted in a different stream - Private Stream 7 - than the sub-pictures - Private Stream 6.
  • the bitmap generator 10 uses the program-accompanying information of the MPEG-2 transport stream, which it receives from the multiplexer 3, to generate bitmaps that are compatible with the MPEG-2 transport stream
  • bitmap generator 10 can Generate compatible highlight information (Private Stream 7).
  • the RUN length encoder 12 compresses the bitmap in accordance with the DVD specification.
  • the sub-picture packer 13 uses the compressed bitmap and the header and a display control sequence table to produce a DVD-compatible sub-picture unit. This is fed into the program stream multiplexer 2 via the private stream 6.
  • FIG. 3 shows a bus 14 which is suitable for transmitting multimedia information.
  • a digital compressed video and / or audio transport data stream for example an MPEG-2 transport data stream, is supplied from a signal source 16.
  • the terminals 15 connected to the bus 14 should at least partially only have a basic functionality, e.g. for receiving DVD compatible MPEG-2 program streams. So that a conversion to a DVD-compatible format is not necessary for each of the terminals 15 connected to the bus, there is a device 17 according to the invention between the signal source 16 and the bus 14, the function and structure of which has been previously discussed.
  • a bus it is of course also possible to provide a branched network for supplying the terminals 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

In order to convert an MPEG-2-compatible transport flow, said flow is decomposed into video and/or audio parts and program-accompanying information messages. The program-accompanying information messages are converted into a DVD-compatible format and are integrated into a DVD-compatible program flow together with the video and/or audio parts. Said measure enables an enlarged display possibility to be provided in simple terminals which only have one base functionality.

Description

Verfahren zur Umwandlung eines Video- und/oder Audio- DatenstromesProcess for converting a video and / or audio data stream
Die Erfindung geht aus von einem Verfahren zur Umwandlung eines digitalen komprimierten Video- und/oder Audio- Transportstromes, insbesondere nach dem MPEG-2 Standard, wie er beispielsweise in einem digitalen Rundfunksystem Anwendung findet .The invention is based on a method for converting a digital compressed video and / or audio transport stream, in particular according to the MPEG-2 standard, as used, for example, in a digital broadcasting system.
Stand der TechnikState of the art
Zur Umwandlung von MPEG-Transportströmen sind Einrichtungen, sogenannte MPEG-Transcoder bekannt, die den MPEG- Transportstrom zerlegen, aufarbeiten und in anderer Form wieder zusammensetzen, beispielsweise nach Modifikation von Steuerbits oder einer Umwandlung der Bitrate. Die EP 11 04 198 AI beschreibt einen solchen MPEG-Transcoder . Aus der DE 199 08 488 AI ist ein Verfahren bekannt, bei dem aus einem DVD/MPEG-Transportstrom über die PIDs die Pakete des gewünschten Programms ausgewählt werden.Devices, so-called MPEG transcoders, are known for converting MPEG transport streams, which disassemble, process and reassemble the MPEG transport stream in another form, for example after modification of control bits or a conversion of the bit rate. EP 11 04 198 AI describes such an MPEG transcoder. DE 199 08 488 AI discloses a method in which the packets of the desired program are selected from a DVD / MPEG transport stream via the PIDs.
Vorteile der Erfindung Mit. den Merkmalen der Ansprüche 1 oder 5 wird ein Verfahren/eine Einrichtung aufgezeigt, mit dem/der es möglich ist, einen digitalen, komprimierten Video- und/oder Audio-Transportstrom, insbesondere einen MPEG-2 Transportstrom, wie er beispielsweise in digitalenAdvantages of the invention With. The features of claims 1 or 5 show a method / device with which it is possible to generate a digital, compressed video and / or audio transport stream, in particular an MPEG-2 transport stream, such as is used, for example, in digital
Rundfunksysteme verwendet wird (DVB, DMB) , in einem DVD- kompatiblen MPEG-2 Programmstrom umzuwandeln, damit er für die Wiedergabe auf einem Endgerät geeignet ist, welches nur eine Grundfunktionalität aufweist, beispielsweise ein vernetztes MPEG-Display, welches ursprünglich lediglich zur Wiedergabe von DVD-Daten über ein lokales Netz konzipiert wurde'.Broadcasting systems is used (DVB, DMB) to convert it into a DVD-compatible MPEG-2 program stream so that it is suitable for playback on a terminal device that only has a basic functionality, for example a networked MPEG display, which was originally only used to play back DVD data was designed over a local network ' .
Mit der Erfindung lassen sich programmbegleitende, insbesondere programmspezifische, Informationen oder weitere den Inhalt des Transportstromes beschreibende Daten, z.B. DVB-Serviceinformationen auf einfache Weise in einen DVD- kompatiblen MPEG-2 Programmstrom konvertieren. Insbesondere die programmbegleitenden Informationen, die zum Teil als sogenannte „private streams" Teil eines MPEG-2With the invention, program-accompanying, in particular program-specific, information or other data describing the content of the transport stream, e.g. Easily convert DVB service information into a DVD-compatible MPEG-2 program stream. In particular the information accompanying the program, some of which are known as "private streams" and part of an MPEG-2
Transportstromes oder MPEG-2 Programmstromes sind, können sich in ihrem Aufbau stark unterscheiden. Durch die erfindungsgemäßen Maßnahmen ist hier in jedem Falle eine DVB-Ko patibilität erreichbar.Transport stream or MPEG-2 program stream, can differ greatly in their structure. With the measures according to the invention, DVB compatibility can be achieved here in any case.
In der Praxis besteht relativ selten Anlaß MPEG-2 Transportströme und MPEG-2 Programmströme ineinander zu konvertieren. Ausnahmen bilden hierbei die Studio- und Sendetechnik und die Übertragung von MPEG-Datenströmen über ein Netzwerk, welches aus Gründen der jeweiligenIn practice, there is a relatively rare occasion to convert MPEG-2 transport streams and MPEG-2 program streams into one another. Exceptions to this are the studio and broadcast technology and the transmission of MPEG data streams over a network, which for reasons of the respective
Spezifikation oder der besseren Adaption ein bestimmtes MPEG-Format bevorzugt. Als Beispiel seien hier Multimediataugliche Busse in Kraftfahrzeugen (MOST, IEEE1394 automotive) genannt. Ein solches MOST MPEG-Display sollte insbesondere zur Dekodierung von DVD-kompatiblen MPEG-2 Programmströmen geeignet sein. Die Dekodierung von Transportströmen, z.B. beim Empfang digitaler Rundfunksysteme (DVB, DMB) , ist optional möglich. Diese Option ist allerdings nur mit zusätzlichem Hardwareaufwand, also mit höheren Gerätekosten, zu erreichen. Die Erfindung ermöglicht es, die MOST MPEG-Displays nur mit der erforderlichen Grundfunktionalität (hier DVD-kompatible MPEG-2 Programstrom-Dekodierung) auszustatten und weitere Funktionalitäten bei der Signalquelle zu implementieren.Specification or better adaptation preferred a certain MPEG format. Multimedia buses in motor vehicles (MOST, IEEE1394 automotive) may be mentioned here as an example. Such a MOST MPEG display should be particularly suitable for decoding DVD-compatible MPEG-2 program streams. The decoding of Transport streams, for example when receiving digital broadcasting systems (DVB, DMB), are optionally possible. However, this option can only be achieved with additional hardware expenditure, i.e. with higher device costs. The invention makes it possible to provide the MOST MPEG displays only with the required basic functionality (here DVD-compatible MPEG-2 program stream decoding) and to implement further functionalities in the signal source.
Der aus der erfindungsgemäßen Konvertierung resultierende MPEG2-Programmstrom entspricht bezüglich seines Formates vollständig einem von einem vernetzten DVD-Player ausgegebenen Programmstrom.The format of the MPEG2 program stream resulting from the conversion according to the invention corresponds completely to a program stream output by a networked DVD player.
Die Navigation durch verschiedene Programme undNavigating through various programs and
Zusatzinformationen kann ebenfalls kompatibel zum DVD- Wiedergabegerät (DVD-Player) erfolgen.Additional information can also be compatible with the DVD playback device (DVD player).
Die Signalisierung der tatsächlichen Quelle geschieht dann lediglich in einem übergeordneten Protokoll durch die Identifikatoren der einzelnen im Netzwerk verbundenenThe actual source is then only signaled in a higher-level protocol by the identifiers of the individual connected in the network
Geräte .Equipment .
Der Vorteil des erfindungsgemäßen Verfahrens liegt insbesondere in der Tatsache, dass eine Erweiterung eines vernetzten DVD-Players auf Transportstrom-basierte Inhalte (digitaler Rundfunk) lediglich zusätzlichen Aufwand auf der Quellenseite (Empfangsmodul) , nicht jedoch auf der Senkenseite (MPEG-Display) bedeuten würde. Da in einem derart vernetzten System in aller Regel mehr Senken (Displays) als Signalquellen (Empfangsmodule) vorhanden sein werden, eröffnet sich hier ein deutliches Potenzial zur Kostenreduzierung.The advantage of the method according to the invention lies in particular in the fact that expanding a networked DVD player to transport stream-based content (digital broadcasting) would only mean additional effort on the source side (receiving module), but not on the sink side (MPEG display) , Since there will generally be more sinks (displays) than signal sources (receiver modules) in such a networked system, there is significant potential for cost reduction.
Gemäß Anspruch 6 ist es vorteilhaft zur Umsetzung der programmbegleitenden Information einen Menü-Generator vorzusehen, der die programmbegleitende Information, z.B. MPEG-PSI und DVG-SI, die Teil des empfangenen MPEG-2 Transportstromes sind, so verarbeitet, dass sie DVD- kompatibel, z.B. als Subpictures, im resultierenden MPEG-2 Programmstrom eingebettet werden können. Gegebenenfalls müssen auch die Audio- und/oder Videodaten in ein den DVD- Spezifikationen entsprechendes Format konvertiert werden.According to claim 6, it is advantageous to provide a menu generator for implementing the program-accompanying information, which the program-accompanying information, for example MPEG-PSI and DVG-SI, which are part of the received MPEG-2 transport stream, processed in such a way that they can be embedded in the resulting MPEG-2 program stream in a DVD-compatible manner, eg as subpictures. If necessary, the audio and / or video data must also be converted into a format corresponding to the DVD specifications.
Zeichnungendrawings
Anhand der Zeichnungen werden Ausführungsbeispiele derBased on the drawings, embodiments of the
Erfindung näher erläutert. Es zeigenInvention explained in more detail. Show it
Figur 1 ein Blockschaltbild einer Einrichtung zur Umwandlung eines MPEG-2 Transportstromes,FIG. 1 shows a block diagram of a device for converting an MPEG-2 transport stream,
Figur 2 ein Blockschaltbild eines Menügenerators', Figur 3 einen Bus mit angeschlossenen Endgeräten.2 shows a block diagram of a menu generator ', 3 shows a bus with connected devices.
Beschreibung von Ausführungsbeispielen • Description of exemplary embodiments •
Das erfindungsgemäße Verfahren dient zur Umwandlung des digital komprimierten Video- und/oder Audio-Transport- Datenstromes insbesondere nach dem MPEG-2 Standard in einen DVD-kompatiblen Programmstrom. Dabei können sowohl Video- und/oder Audiodaten als auch programmbegleitende, insbesondere programmbeschreibende Daten konvertiert werden. Die Konvertierung erfolgt auf Basis der MPΞG-2 Systemspezifikation durch Zerlegung des MPEG-2 Transportstromes in einzelne Audio- und Video-PES-Ströme (Packetised Elementary Streams) , gemäß Figur 1 mittels dem Multiplexer 1, und ihr anschließendes Multiplexen mittels Multiplexer 2 in einen gültigen MPEG-2 Programmstrom.The method according to the invention is used to convert the digitally compressed video and / or audio transport data stream, in particular according to the MPEG-2 standard, into a DVD-compatible program stream. Both video and / or audio data and program-accompanying, in particular program-describing, data can be converted. The conversion is carried out on the basis of the MPΞG-2 system specification by breaking down the MPEG-2 transport stream into individual audio and video PES streams (Packetised Elementary Streams), according to FIG. 1 by means of multiplexer 1, and their subsequent multiplexing using multiplexer 2 into one valid MPEG-2 program stream.
Die im MPEG-2 Transportstrom enthaltenen Audiodaten können sich in seltenen Fällen in Abtastrate, Wortbreite und Komprimierungsalgorithmus von denen eines DVD-typischen Programmstromes unterscheiden. Darum ist hier vor der Bildung des Programmstromes gegebenenfalls eine zusätzliche Anpaßstufe - Formatwandler 3 - für Audiodaten notwendig. Diese Audiodaten werden ebenso wie die Videodaten auf der Ebene der PES Packets verarbeitet.In rare cases, the audio data contained in the MPEG-2 transport stream can differ in sampling rate, word length and compression algorithm from that of a DVD-typical program stream. Therefore, an additional adaptation stage - format converter 3 - for audio data may be necessary here before the formation of the program stream. This audio data, like the video data, is processed at the PES packet level.
Gleichzeitig werden die im Transportstrom vorhandenen ' programmbegleitenden beziehungsweise programmbeschreibenden Infomationen (MPEG-PSI, DVB-SI) abgetrennt mittels dem Multiplexer 3 und derart konvertiert, dass sie im Einklang mit der DVD-Spezifikation in den entstehenden Programmstrom mittels Multiplexer 2 ebenfalls gemultiplext werden können.At the same time, the information accompanying the program or describing the program (MPEG-PSI, DVB-SI) in the transport stream is separated by means of the multiplexer 3 and converted in such a way that it can also be multiplexed into the resulting program stream using multiplexer 2 in accordance with the DVD specification.
In MPEG-2 Transportströmen sind neben Audio- und Videodaten auch zusätzliche programmbeschreibende Informationen enthalten. Ein Beispiel für solche programmbeschreibende Informationen ist das EPG (Electronic program guide) in DVB- Übertragungen.In addition to audio and video data, MPEG-2 transport streams also contain additional information describing the program. An example of such program-describing information is the EPG (Electronic program guide) in DVB transmissions.
Diese ursprünglich im Transportstrom übertragenen Daten müssen in der Anzeigeeinheit im Endgerät auf DVD-kompatible Weise visualisiert oder verarbeitet werden können. Das ist auf DVD-konforme Weise nur möglich, wenn sie alsThis data originally transmitted in the transport stream must be able to be visualized or processed in a DVD-compatible manner in the display unit in the terminal. This is only possible in a DVD compliant way if it is as
„Presentation Control Information" oder „Sub-pictures" in den entsprechenden MPEG-2 Programmstrom gemultiplext werden, Die Umwandlung dieser Daten in einen DVD-kompatiblen Datenstrom übernimmt gemäß Figur 3 ein sogenannter Menügenerator 4. Sollen programmbeschreibende Informationen auf Benutzerwunsch dargestellt werden, erzeugt der Menügenerator 4 aus diesen DVD-kompatiblen Menüs und speist sie mit dem Programmstrom in das Netzwerk oder System ein."Presentation Control Information" or "Sub-pictures" are multiplexed into the corresponding MPEG-2 program stream. According to FIG. 3, this data is converted into a DVD-compatible data stream by a so-called menu generator 4. If program-descriptive information is to be displayed at the user's request, the Menu generator 4 from these DVD-compatible menus and feeds them with the program stream into the network or system.
Der Menügenerator 4 ist ebenfalls für einen Teil derThe menu generator 4 is also for part of the
Interaktion zwischen Benutzer und Signalquelle verantwortlich. Während in MPEG-2 Transportströmen die Informationen über die enthaltenen Programme in Form von Tabellen mit verschiedenen Querverweisen übertragen werden, sind zusätzliche Informationen etwa über vorhandene Titel, Sprachen oder Untertitel in DVD-kompatiblen Programmströmen als komplette Menüs enthalten. Diese bestehen aus einem Hintergrund, den Menüdaten und den Highlight-Informationen. Die Aufbereitung der in MPEG-2 Transportströmen enthaltenen programmspezifischen Daten in DVD-konforme- Menüs ist daher ebenfalls Aufgabe des Menügenerators ' 4.Interaction between user and signal source responsible. While in MPEG-2 transport streams the information about the programs contained is transmitted in the form of tables with various cross-references, additional information is about existing titles, languages or subtitles in DVD-compatible program streams included as complete menus. These consist of a background, the menu data and the highlight information. The processing of the program-specific data contained in MPEG-2 transport streams in DVD-compliant menus is therefore also the task of the menu generator ' 4.
Die Steuerung der für die Konvertierung notwendigen Baugruppen - Menügenerator 4 und Multiplexer 3 - erfolgt auf der Basis von Benutzereingaben (User Control Information 8) über die Kontrolleinheit 5 und gerätespezifischenThe control of the modules required for the conversion - menu generator 4 and multiplexer 3 - is carried out on the basis of user input (user control information 8) via the control unit 5 and device-specific
Voreinstellungen. Die erlaubten Benutzereingaben sind Teil der für die DVD-Wiedergabe erlaubten Interaktionen. Die Kontrolleinheit 5 steuert die Baugruppen 1, 2, 3, 4, 9 und 10.Preferences. The permitted user inputs are part of the interactions permitted for DVD playback. The control unit 5 controls the assemblies 1, 2, 3, 4, 9 and 10.
Für die „User Control Information" ist vorteilhafterweise ein separater Signalisierungskanal zur Steuerung des Menügenerators 4 von mindestens einem DVD-kompatiblen Endgerät aus vorgesehen.For the "User Control Information", a separate signaling channel for controlling the menu generator 4 is advantageously provided from at least one DVD-compatible terminal.
Wie in Figur 1 dargestellt, erzeugt der Menügenerator 4 zwei DVD-kompatible Bitströme 6 und 7 und zwar einen aus Bitmaps bestehenden Bitstrom 6 gemäß dem MPEG-2-Standard und einen weiteren Bitstrom 7 für eine Wiedergabesteuerung, insbesondere zur Erzeugung von Auswahlmenüs für dieAs shown in Figure 1, the menu generator 4 generates two DVD-compatible bit streams 6 and 7, namely a bit stream 6 consisting of bit maps according to the MPEG-2 standard and a further bit stream 7 for playback control, in particular for generating selection menus for the
Wiedergabe in einem DVD- ompatiblen Endgerät.Playback in a DVD compatible device.
Figur 1 zeigt eingangsseitig noch einen weiteren Multiplexer 9, der insbesondere vorgesehen ist, Overhead-Informationen abzutrennen, z.B. für die Interaktion mit dem Multiplexer 2.FIG. 1 shows yet another multiplexer 9 on the input side, which is provided in particular to separate overhead information, e.g. for the interaction with the multiplexer 2.
Den Aufbau des Menügenerators 4 zeigt Figur 2. Dieser Menügenerator 4 hat die Aufgabe, die in einem MPEG-2 Transportstrom enthaltenen programmbegleitenden Informationen in DVD-kompatible Sub-Pictures umzuwandeln. Dabei handelt es sich um die MPEG-PSI (Programms Specific Information) , die in jedem MPEG-2 Transportstrom vorhanden sind und um systemspezifische Informationen der Transportstromquelle wie DVB-SI (DVB-System Information) oder EPG (Electronic Program Guide) , die nur in bestimmten Systemen verwendet werden, und zum Teil optional sind.The structure of the menu generator 4 is shown in FIG. 2. This menu generator 4 has the task of converting the program-accompanying information contained in an MPEG-2 transport stream into DVD-compatible sub-pictures. This is the MPEG-PSI (Program Specific Information), which are present in every MPEG-2 transport stream and around system-specific information of the transport stream source such as DVB-SI (DVB-System Information) or EPG (Electronic Program Guide), which are only used in certain systems and are partly optional.
Während die programmbegleitenden Informationen eines MPEG-2 Transportstromes z.B. im ASCII-Textfor at vorliegen können, bestehen die Sub-Pictures einer DVD immer aus 16-farbigen Bitmaps. Diese Bitmaps müssen komprimiert und in Sub-Picture Units gepackt vorliegen. Die Sub-Picture Units bestehen zusätzlich zum komprimierten Bitmap aus einem Header und einer Display Control Sequence Table. Diese Tabelle beschreibt Änderungen der Erscheinung der Bitmap während der Darstellung, z.B. Farbe und Kontrast.While the program accompanying information of an MPEG-2 transport stream e.g. in the ASCII text format, the sub-pictures on a DVD always consist of 16-color bitmaps. These bitmaps must be compressed and packed in sub-picture units. In addition to the compressed bitmap, the sub-picture units consist of a header and a display control sequence table. This table describes changes in the appearance of the bitmap during the display, e.g. Color and contrast.
Zusätzlich zu den Sub-Pictures können optional auch DVD- konforme, sogenannte Presentation Control Information erzeugt werden. Diese beinhalten unter anderem die Higlight- Information, mit denen einzelne Teile des Gesamtbildes mit unterschiedlichen Farben hinterlegt werden können. Dadurch wird es möglich, Auswahlmenüs, z.B. für die Wahl einer bestimmten Sprache oder eines bestimmten Programmes, zu erzeugen. Die erzeugten Highlight Information werden in einem anderen Stream - Private Stream 7 - als die Sub- Pictures - Private Stream 6 - übertragen.In addition to the sub-pictures, DVD-compliant presentation control information can also be generated. These include, among other things, the highlight information, with which individual parts of the overall picture can be deposited with different colors. This makes it possible to select menus, e.g. for the selection of a specific language or a specific program. The highlight information generated is transmitted in a different stream - Private Stream 7 - than the sub-pictures - Private Stream 6.
Der Bitmap-Generator 10 erzeugt aus den programmbegleitenden Informationen des MPEG-2 Transportstromes, die er von dem Multiplexer 3 erhält, Bitmaps, die kompatibel zu denThe bitmap generator 10 uses the program-accompanying information of the MPEG-2 transport stream, which it receives from the multiplexer 3, to generate bitmaps that are compatible with the
Vorgaben der DVD-Spezifikation sind. Dazu kann er z.B. auf vordefinierte Bitmaps zugreifen, die beispielsweise im Speicher 11 abgelegt sind, und diese je nach Darzustellendem zu einer Gesamt-Bitmap zusammenstellen. Er kann die Gesam - Bitmap jedoch auch während der Laufzeit berechnen.Requirements of the DVD specification are. For this he can e.g. access predefined bitmaps, which are stored in memory 11, for example, and, depending on what is to be shown, compile them into an overall bitmap. However, he can also calculate the overall bitmap during runtime.
Zusätzlich zu den Bitmaps kann der Bitmap-Generator 10 DVD- kompatible Highlight-Information erzeugen (Private Stream 7) .In addition to the bitmaps, the bitmap generator 10 can Generate compatible highlight information (Private Stream 7).
Der RUN-Length-Coder 12 komprimiert die Bitmap entsprechend DVD-Spezifikation.The RUN length encoder 12 compresses the bitmap in accordance with the DVD specification.
Der Sub-picture Packer 13 erzeugt aus der komprimierten Bitmap sowie aus dem Header und einer Display Control Sequence Table eine DVD-kompatibles Sub-Picture unit. Dieses wird im Programmstrom-Multiplexer 2 über den Private Stream 6 zugeführt.The sub-picture packer 13 uses the compressed bitmap and the header and a display control sequence table to produce a DVD-compatible sub-picture unit. This is fed into the program stream multiplexer 2 via the private stream 6.
Figur 3 zeigt einen Bus 14, welcher geeignet ist, Multimedia-Informationen zu übertragen. Multimedia- Informationen zu übertragen. Von einer Signalquelle 16 aus wird ein digitaler komprimierter Video- und/oder Audio- Transportdatenstrom, beispielsweise ein MPEG-2 Transportdatenstrom angeliefert. Die an den Bus 14 angeschlossenen Endgeräte 15 sollen zumindest teilweise nur eine Grundfunktionalität, z.B. zum Empfang von DVD- kompatiblen MPEG-2 Programströmen, aufweisen. Damit nicht bei jedem der an den Bus angeschlossenen Endgeräte 15 eine Umsetzung in ein DVD-kompatibles Format notwendig ist, befindet sich zwischen Signalquelle 16 und dem Bus 14 eine erfindungsgemäße Einrichtung 17, deren Funktion und Aufbau zuvor behandelt wurde. An Stelle eines Bus kann natürlich auch ein verzweigtes Netz zur Speisung der Endgeräte 15 vorgesehen sein.FIG. 3 shows a bus 14 which is suitable for transmitting multimedia information. To transmit multimedia information. A digital compressed video and / or audio transport data stream, for example an MPEG-2 transport data stream, is supplied from a signal source 16. The terminals 15 connected to the bus 14 should at least partially only have a basic functionality, e.g. for receiving DVD compatible MPEG-2 program streams. So that a conversion to a DVD-compatible format is not necessary for each of the terminals 15 connected to the bus, there is a device 17 according to the invention between the signal source 16 and the bus 14, the function and structure of which has been previously discussed. Instead of a bus, it is of course also possible to provide a branched network for supplying the terminals 15.
Bisher wurde die Erfindung ausgehend von einem MPEG-Standard erläutert. Natürlich kann das Verfahren/die Einrichtung nach der Erfindung auch für andere Bildverarbeitungs-Standards , z.B. MPEG-4, MPEG-7 verwendet werden mit gegebenenfalls notwendigen Modifikationen. So far, the invention has been explained based on an MPEG standard. Of course, the method / device according to the invention can also be used for other image processing standards, e.g. MPEG-4, MPEG-7 are used with any necessary modifications.

Claims

Patentansprüche claims
1. Verfahren zur Umwandlung eines digitalen komprimierten Video- und/oder Audio-Datenstromes, insbesondere nach dem MPEG-2 Standard, wie er beispielsweise in einem digitalen Rundfunksystem Anwendung findet, mit folgenden Schritten: Zerlegung des Transportstromes in Video- und/oder Audioanteile sowie in programmbegleitende Information, Umwandlung zumindest der programmbegleitenden Information in ein DVD-kompatibles Format, sowie gegebenenfalls der Video- und/oder Audio-Anteile, wenn sie im Transportstrom insbesondere nicht in einem DVD- kompatiblen Format vorliegen,1. A method for converting a digital compressed video and / or audio data stream, in particular according to the MPEG-2 standard, as used, for example, in a digital broadcasting system, with the following steps: decomposing the transport stream into video and / or audio parts and in program-accompanying information, conversion of at least the program-accompanying information into a DVD-compatible format, and, if appropriate, the video and / or audio components if they are not present in a DVD-compatible format in the transport stream,
Einbettung der umgewandelten programmbegleitenden Informationen in einen DVD-kompatiblen Programmstrom zusammen mit den Video- und/oder Audio-Anteilen.Embedding the converted information accompanying the program in a DVD-compatible program stream together with the video and / or audio components.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der DVD-kompatible Programmstrom in ein Netz oder einen Bus gespeist wird, an welches/welchem eine Mehrzahl von DVD-kompatiblen Endgeräten anschließbar ist.2. The method according to claim 1, characterized in that the DVD-compatible program stream is fed into a network or a bus to which / which a plurality of DVD-compatible terminals can be connected.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass neben der programmbegleitenden Information des Transportstromes zusätzliche Nutzer - und/oder Geräte-spezifische Informationen in den DVD- kompatiblen Programmstrom eingebettet werden.3. The method according to claim 1 or 2, characterized in that in addition to the program-accompanying information of the transport stream, additional user and / or device-specific information are embedded in the DVD-compatible program stream.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die programmbegleitende4. The method according to any one of claims 1 to 3, characterized in that the program accompanying
Information und gegebenenfalls die zusätzliche Information als „Presentation Control Information" oder „Subpictures" in einen MPEG-Programmstrom gemultiplext werden.Information and, if necessary, the additional Information as "Presentation Control Information" or "Subpictures" are multiplexed into an MPEG program stream.
5. Einrichtung zur Umwandlung eines digitalen komprimierten Video- und/oder Audiodaten- Transportstromes, insbesondere nach dem MPEG-2-Standard mit folgenden Einheiten: mindestens einer Demultiplexereinheit (1, 3) zur Trennung von Video- und/oder Audiodaten des5. Device for converting a digital compressed video and / or audio data transport stream, in particular according to the MPEG-2 standard with the following units: at least one demultiplexer unit (1, 3) for separating video and / or audio data from the
Transportstromes und programmbegleitender Information, einer Einheit (4) zur Umwandlung der programmbegleitenden Information in ein DVD-kompatibles Format, - einer Multiplexer-Einheit (2) zur Einbettung der umgewandelten programmbegleitenden Information in einen DVD-kompatiblen Programmstrom zusammen mit den Video- und/oder Audioanteilen im Transportstrom, für die gegebenenfalls ein Formatwandler (31) vorgesehen ist, insbesondere wenn sie nicht bereits in einem DVD- kompatiblen Format vorliegen.Transport stream and program-accompanying information, a unit (4) for converting the program-accompanying information into a DVD-compatible format, - a multiplexer unit (2) for embedding the converted program-accompanying information in a DVD-compatible program stream together with the video and / or Audio components in the transport stream for which a format converter (31) may be provided, in particular if they are not already available in a DVD-compatible format.
6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, dass zur Umwandlung der programmbegleitenden Informationen in ein DVD-kompatibles Format ein6. Device according to claim 5, characterized in that for converting the program-accompanying information into a DVD-compatible format
Menügenerator (4) vorgesehen ist, der insbesondere einen Bitmap-Generator (10) enthält zur Umwandlung der programmbegleitenden Informationen in Bitmaps.Menu generator (4) is provided, which in particular contains a bitmap generator (10) for converting the information accompanying the program into bitmaps.
7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Menügenerator (4) eingerichtet ist, zwei DVD- kompatible Bitströme abzugeben und zwar einen insbesondere aus Bitmaps bestehenden Bitstrom (6) gemäß dem MPEG-2 Standard und einen weiteren Bitström (7) für eine Wiedergabesteuerung, insbesondere zur Erzeugung von Auswahlmenüs für die Wiedergabe in einem DVD- kompatiblen Endgerät.7. Device according to claim 6, characterized in that the menu generator (4) is set up to deliver two DVD-compatible bit streams, specifically a bit stream (6) consisting of bit maps according to the MPEG-2 standard and a further bit stream (7) for a playback control, especially for generation selection menus for playback in a DVD-compatible device.
8. Einrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass dem Menügenerator (4) ein Speicher8. Device according to claim 6 or 7, characterized in that the menu generator (4) has a memory
(11) für vordefinierte Bitmaps zugeordnet ist.(11) is assigned for predefined bitmaps.
9. Einrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass dem Menügenerator (4) eine Einheit9. Device according to claim 7 or 8, characterized in that the menu generator (4) is a unit
(12) für die Kompression der Bitmaps zugeordnet ist und eine Einrichtung (13) zur Packung der komprimierten Bitmaps in Subpicture-Units gemäß dem DVD-Standard.(12) for the compression of the bitmaps and a device (13) for packing the compressed bitmaps in subpicture units according to the DVD standard.
10. Einrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass der Menügenerator (4) eingerichtet ist -in den weiteren Bitstrom (7) Informationen über Benutzer-individuelle Auswahl-Menüs einzufügen.10. Device according to one of claims 7 to 9, characterized in that the menu generator (4) is set up - to insert information about user-specific selection menus into the further bit stream (7).
11. Einrichtung nach Anspruch 10, dadurch gekennzeichnet, dass ein separater Signalisierungskanal vorgesehen ist, zur Steuerung des Menügenerators (4) bezüglich eines nutzerindividuellen Auswahlmenüs von mindestens einem DVD-kompatiblen Endgerät aus.11. The device according to claim 10, characterized in that a separate signaling channel is provided for controlling the menu generator (4) with respect to a user-specific selection menu from at least one DVD-compatible terminal.
12. System, bestehend aus einem Multimedia-tauglichen Bus (14) und daran anschließbaren Endgeräten (15) , die zumindest teilweise nur eine Grundfunktionalität aufweisen, z.B. zum Empfang von DVD-kompatiblen MPEG-212. System consisting of a multimedia-compatible bus (14) and terminal devices (15) which can be connected to it and which at least partially have only a basic functionality, e.g. for receiving DVD compatible MPEG-2
Programmströmen, mindestens einer Signalquelle (16) , die einen digitalen komprimierten Video- und/oder Audio Datenstrom liefert, der mit der Grundfunktionalität mindestens eines der Endgeräte (15) nicht dekodierbar ist, sowie einer Einrichtung (17) zur Umwandlung gemäßProgram streams, at least one signal source (16) which supplies a digital compressed video and / or audio data stream which cannot be decoded with the basic functionality of at least one of the terminals (15), and a device (17) for conversion in accordance with
Anspruch 5. Claim 5.
EP02762220A 2001-09-18 2002-07-10 Method for converting a video and/or audio data flow Ceased EP1433328A1 (en)

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