WO2008136623A1 - Method and apparatus for providing high-quality multimedia service in dmb system - Google Patents

Method and apparatus for providing high-quality multimedia service in dmb system Download PDF

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Publication number
WO2008136623A1
WO2008136623A1 PCT/KR2008/002516 KR2008002516W WO2008136623A1 WO 2008136623 A1 WO2008136623 A1 WO 2008136623A1 KR 2008002516 W KR2008002516 W KR 2008002516W WO 2008136623 A1 WO2008136623 A1 WO 2008136623A1
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WO
WIPO (PCT)
Prior art keywords
base layer
enhancement layer
packet
layer
pes
Prior art date
Application number
PCT/KR2008/002516
Other languages
French (fr)
Inventor
Kwang-Yong Kim
Gwang-Soon Lee
Joungil Yun
Young-Su Kim
Kyu-Tae Yang
Jae-Hwui Bae
Seomee Choi
Ju-Yeun Kim
Jae-Hyun Seo
Jong-Soo Lim
Soo-In Lee
Original Assignee
Electronics And Telecommunications Research Institute
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 Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to EP08753313A priority Critical patent/EP2153645A4/en
Priority to CN2008800231475A priority patent/CN101690200B/en
Publication of WO2008136623A1 publication Critical patent/WO2008136623A1/en

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Classifications

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    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
    • H04N21/43074—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of additional data with content streams on the same device, e.g. of EPG data or interactive icon with a TV program
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    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
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    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]

Definitions

  • the present invention relates to a media processing method and apparatus for providing high-quality multimedia services, by which a function for providing high-quality services is added to digital multimedia broadcasting and backward compatibility with existing receivers can be maintained.
  • the present invention is derived from a research project supported by the Information Technology (IT) Research & Development (R&D) program of the Ministry of Information and Communication (MIC) [2006-S-017-02, Development of High-Tech Terrestrial DMB Transmission].
  • IT Information Technology
  • R&D Research & Development
  • MIC Ministry of Information and Communication
  • DMB digital multimedia broadcasting
  • a multi-media service is multiplexed into a single transport stream and the multiplexed service is transmitted.
  • DMB broadcasting multi-media services are provided through a single stream, and thus there is a limit in providing a high-quality service.
  • FIG. 1 is a block diagram illustrating a structure of a media processor of a conventional transmission unit in digital multimedia broadcasting (DMB);
  • DMB digital multimedia broadcasting
  • FIG. 2 is a conceptual diagram illustrating a system for providing high-quality multimedia services in DMB, according to an embodiment of the present invention
  • FIG. 3 is a block diagram for illustrating an encoding and multiplexing method performed in an encoding unit, according to one embodiment of the present invention
  • FIG. 4 is a block diagram for illustrating an encoding and multiplexing method performed in an encoding unit, according to another embodiment of the present invention
  • FIG. 5 is a block diagram of a receiving device that performs a decoding and de-multiplexing method corresponding to the encoding and multiplexing method illustrated in FIG. 3.
  • FIG. 6 is a flowchart illustrating a decoding and de-multiplexing method performed in a decoding unit, according to one embodiment of the present invention
  • FIG. 7 is a block diagram for describing a decoding and de-multiplexing method performed in a decoding unit, according to another embodiment of the present invention.
  • FIG. 8 is a flowchart of the decoding and de-multiplexing method illustrated in FIG. 7;
  • FIG. 9 illustrates a decoding and de-multiplexing method according to another embodiment of the present invention
  • FIG. 10 illustrates an MPEG-4 object descriptor (OD) used in the present invention
  • FIG. 11 is a block diagram of a transmission device for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention
  • FIG. 12 is a block diagram of a reception device for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention.
  • the present invention provides a transceiving method and apparatus by which a function for providing high-quality services is added to digital multimedia broadcasting and backward compatibility with existing receivers can be maintained.
  • the present invention provides a structure in which a transport stream (TS) is separated into a base layer TS and an enhancement layer TS, a conventional TS is transmitted via the base layer TS and additional multimedia service information for high-quality services is multiplexed and transmitted via the enhancement layer TS, so that services transmitted through different transport channels can be incorporated with each other and provided when needed.
  • TS transport stream
  • DMB digital multimedia broadcasting
  • the present invention proposes an apparatus and method of providing high-quality multimedia services in digital multimedia broadcasting (DMB), by which a function for providing high-quality services is added to DMB and compatibility with a conventional DMB network is possible so that a predetermined quality can be maintained with the conventional DMB network even without special machine changes.
  • DMB digital multimedia broadcasting
  • a transmission device for providing high-quality multimedia services in a DMB (digital multimedia broadcasting) transmission system, the transmission device comprising: an encoding unit separating input multimedia contents into a base layer ES (elementary stream) and an enhancement layer ES and encoding the base layer ES and the enhancement layer ES, respectively; an SL (synchronization layer) packet transform unit transforming the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet, respectively; a PES (program specific information) packet transform unit transforming the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet, respectively; and a TS (transport stream) multiplexing unit multiplexing the base layer PES packet and the enhancement layer PES packet, respectively, according to a base layer ES and an enhancement layer ES and outputting a base layer TS packet and an enhancement layer TS packet.
  • a receiving device for providing high-quality multimedia services in a DMB transmission system, the receiving device comprising: a quality selection unit determining whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received; a decoding unit decoding the base layer stream and the enhancement layer stream, respectively, and outputting a base layer TS packet and an enhancement layer TS packet, respectively; a TS de-multiplexing unit de-multiplexing the base layer and enhancement layer TS packets, respectively, so as to obtain a base layer PES packet and an enhancement layer PES packet, respectively; a PES de-packet transform unit decoding the base layer and enhancement layer PES packets, respectively, so as to obtain a base layer SL packet and an enhancement layer SL packet, respectively; and an SL de-packet transform unit multiplexing the base layer and enhancement SL packets so as to obtain a base layer ES and an enhancement layer ES.
  • a transmission method for providing high-quality multimedia services in a DMB transmission system comprising: separating input multimedia contents into a base layer ES and an enhancement layer ES and encoding the base layer ES and the enhancement layer ES; transforming the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet; transforming the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet; and multiplexing the base layer PES packet and the enhancement layer PES packet according to a base layer ES and an enhancement layer ES and outputting a base layer TS packet and an enhancement layer TS packet.
  • a receiving method for providing high-quality multimedia services in a DMB transmission system comprising: a quality selection operation of determining whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received; a decoding operation of decoding the base layer stream and the enhancement layer stream and outputting a base layer TS packet and an enhancement layer TS packet; a TS de-multiplexing operation of de-multiplexing the base layer and enhancement layer TS packets so as to obtain a base layer PES packet and an enhancement layer PES packet; a PES de-packet transform operation of decoding the base layer and enhancement layer PES packets so as to obtain a base layer SL packet and an enhancement layer SL packet; and an SL de-packet transform operation of multiplexing the base layer and enhancement SL packets so as to obtain a base layer ES and an enhancement layer ES.
  • FIG. 1 is a block diagram illustrating a structure of a media processor of a conventional transmission unit in digital multimedia broadcasting (DMB).
  • DMB digital multimedia broadcasting
  • a video encoder encodes an incoming image signal in accordance with the video standard and an audio encoder encodes an incoming audio signal.
  • An initial object descriptor (IOD) generator 110 generates IOD data which is based on the ISO/IEC 14496-1 standard.
  • An object descriptor (OD)/BIFS (binary format for scenes) generator 120 generates an OD/BIFS stream which is based on the ISO/IEC 14496-1 standard.
  • An SL packetizer 130 (SL - synchronization layer) generates an SL packet, which is a packet for synchronization between incoming media streams, and follows the
  • the SL packetizer 130 receives an
  • OD/BIFS stream a video elementary stream (ES), an audio ES, and additional data and generates an OD/BIFS SL packet, a video SL packet, an audio SL packet, and additional data packet corresponding to the OD/BIFS stream, the video ES, the audio ES, and the additional data, respectively.
  • ES video elementary stream
  • audio ES audio ES
  • additional data generates an OD/BIFS SL packet, a video SL packet, an audio SL packet, and additional data packet corresponding to the OD/BIFS stream, the video ES, the audio ES, and the additional data, respectively.
  • a section generator (or a PSI generator 140) (PSI - program specific information) generates a section including received IOD/OD/BIFS, and follows the ISO/IEC 13818-1 standard.
  • the section generator 140 includes a 14496 section packetization unit for packetizing an SL packet (i.e., the OD/BIFS SL packet) into a 14496 section, and a PSI packetization unit for generating PSI information including the IOD data.
  • a PES packetizer 150 receives and PES-packetizes the SL packets, and follows the ISO/IEC 13818-1 standard.
  • a transport stream (TS) multiplexer 160 receives the section and a PES packet, which is a result of the PES packetization, from the section generator 140 and the PES packetizer 150, respectively, and multiplexes the section and the PES packet to an MPEG-2 TS.
  • FIG. 2 is a conceptual diagram illustrating a system for providing high-quality multimedia services in DMB, according to an embodiment of the present invention.
  • multimedia services are multiplexed and transmitted through a single transport stream.
  • a hierarchical modulation function is given to a DMB transmission system so as to separate a TS into a base layer TS and an enhancement layer TS, and thus a conventional TS is transmitted as the base layer TS and additional multimedia service information for high-quality services is transmitted in the enhancement layer TS.
  • basic-quality multimedia services can be provided to low-spec terminals such as cellular phones, and high-quality multimedia services can be provided to high-spec terminals.
  • An encoding unit includes a high-quality video encoder 210, a high-quality audio encoder 220, and an additional data encoder 230.
  • the high-quality video encoder 210 may be a scalable video encoder, a stereo 3D video encoder, a multi-view video encoder, a multi-channel audio encoder, or the like.
  • the high-quality video encoder 210 separates an input stream into a base layer video ES 211 and an enhancement layer video ES 212 and outputs the base layer video ES 211 and the enhancement layer video ES 212 to a media system encoding and multiplexing unit 240.
  • the media system encoding and multiplexing unit 240 multiplexes the base layer video ES 211 and the enhancement layer video ES 212.
  • the high-quality audio encoder 220 separates an input stream into a base layer audio ES and an enhancement layer audio ES and outputs the base layer audio ES and the enhancement layer audio ES to the media system encoding and multiplexing unit 240.
  • the media system encoding and multiplexing unit 240 multiplexes the base layer audio ES and the enhancement layer audio ES.
  • the additional data encoder 230 separates an input stream into a base layer data ES and an enhancement layer data ES and outputs the base layer data ES and the enhancement layer data ES to the media system encoding and multiplexing unit 240.
  • the media system encoding and multiplexing unit 240 multiplexes the base layer data ES and the enhancement layer data ES.
  • the media system encoding and multiplexing unit 240 multiplexes each of the video, audio, and data ESs respectively received from the high-quality video encoder 210, the high-quality audio encoder 220, and the additional data encoder 230 into a base layer and an enhancement layer.
  • a transmission unit 250 can transmit the multiplexed video, audio, and data ESs via either an identical channel or different channels.
  • a decoding unit includes a high-quality video decoder, a high-quality audio decoder, a reception unit, and a media system decoding and de-multiplexing unit 260.
  • FIGS. 3 and 4 illustrate embodiments of media system encoding and multiplexing methods performed in the encoding unit illustrated in FIG. 2, which are proposed in order to provide high-quality multimedia services in DMB.
  • FIG. 5 is a block diagram of a receiving device that performs a decoding and de-multiplexing method corresponding to the encoding and multiplexing method illustrated in FIG. 3.
  • FIGS. 6 and 7 illustrate decoding and de-multiplexing methods performed in a decoding unit in order to provide high-quality multimedia services in DMB, according to embodiments of the present invention.
  • FIG. 8 is a flowchart illustrating the decoding and de-multiplexing method illustrated in FIG. 7.
  • FIG. 9 illustrates a decoding and de-multiplexing method according to another embodiment of the present invention.
  • FIG. 3 is a block diagram of a media system encoding and multiplexing unit in the encoding unit illustrated in FIG. 2, according to one embodiment of the present invention.
  • an SL packetizer 310 receives a base layer ES and an enhancement layer ES from each of the high-quality video encoder 210, the high-quality audio encoder 220, and the additional data encoder 230 and transforms the received base layer ESs and the enhancement layer ESs into base layer SL packets and enhancement layer SL packets.
  • the SL packetizer 310 synchronizes streams (i.e., video, audio, and data ESs) for a base layer with the corresponding streams (i.e., video, audio, and data ESs) for an enhancement layer in a way similar to the way in which the SL packetizer 130 of FIG. 1 synchronizes video, audio, and data streams.
  • time stamp information such as a composition time stamp (CTS) is inserted into the streams based on an identical OCR (Object Clock Reference) inferred from identical system time clocks (STCs).
  • CTS composition time stamp
  • OCR Object Clock Reference
  • a PES packetizer 320 PES-packetizes the received SL packets in the same or similar way as used in the SL packetizer 130 of FIG. 1 , and inserts time stamps such as presentation time stamps (PTSs) into the base layer ESs and the enhancement layer ESs based on an identical system clock in order to perform synchronization.
  • time stamps such as presentation time stamps (PTSs)
  • Each pair of a pair of IOD generators 350 and 351 , a pair of OD/BIFS generators 360 and 361 , and a pair of section generators 370 and 371 exists for a base layer stream and an enhancement layer stream, and each pair generates a base layer stream and an enhancement layer stream.
  • the media system encoding and multiplexing unit of FIG. 3 includes two TS multiplexers, namely, a base layer TS multiplexer 330 and an enhancement layer TS multiplexer 340.
  • the media system encoding and multiplexing unit of FIG. 3 multiplexes packetized PES streams and PSI section/14496 section streams according to a base layer and an enhancement layer.
  • the two TS multiplexers 330 and 340 generate a base layer MEPG-2 TS packet and an enhancement layer MEPG-2 TS packet by using an identical STC, and also generate a program clock reference (PCR)_by using the identical STC.
  • PCR program clock reference
  • a PCR may be inserted into an audio TS packet that is generated by a relatively small amount and at relatively regular intervals. Accordingly, a PTS and an OCR may also be inserted into only an audio stream
  • the multiplexed base layer MPEG-2 TS packet and the multiplexed enhancement layer MPEG-2 TS packet are respectively encoded in channel encoders suitable for a base layer transmission channel and an enhancement transmission channel, and then respectively transmitted to the base layer transmission channel and the enhancement transmission channel.
  • a base layer stream and an enhancement layer stream may be mapped into a single symbol and transmitted to a single radio frequency (RF) channel.
  • RF radio frequency
  • the base layer PSI information 380 which corresponds to the prior art, is transmitted without changes, and only PMT/OD/BIFS information added for an enhancement layer is extracted and included in the enhancement layer PSI information 381.
  • a receiving terminal can extract corresponding packets from MPEG-2 TSs of the two layers by using the base layer PSI information 380 and the enhancement layer PSI information 381.
  • the conventional base layer PSI information 380 is transmitted without changes, and the enhancement layer PSI information 381 contains extended PMT/OD/BIFS information obtained by adding information for an enhancement layer to PMT/OD/BIFS information for a basic layer.
  • the receiving terminal can extract corresponding packets from MPEG-2 TSs of the two layers by using the base layer PSI information 380 and the enhancement layer PSI information 381 including the extended PMT/OD/BIFS information.
  • high-quality services when provision of high-quality services is selected, high-quality services can be simply provided through only an analysis of enhancement layer PSI information without need to analyze base layer PSI information.
  • the operation of extracting information required for an enhancement layer can be simplified by not performing a process of analyzing the base layer PSI information.
  • FIG. 4 is a block diagram for illustrating a media system encoding and multiplexing method performed in an encoding unit, according to another embodiment of the present invention.
  • the media system encoding and multiplexing method illustrated in FIG. 4 is the same as that illustrated in FIG. 3 in terms of synchronization, and is different therefrom in that a base layer and an enhancement layer share a single IOD generator, a single OD/BIFS generator, and a section generator.
  • IOD, OD, and BIFS which are additional data transmitted from a transmission side, are transmitted through only a base layer so that a terminal extracts ESs for two layers (i.e., a base layer and an enhancement layer) and constructs a scene by using the extracted ESs, thereby increasing transmission efficiency.
  • IOD, OD, and BIFS which are relatively small amounts of data required for the two layers, are transmitted through only a single channel (i.e., a base layer channel), overhead generated due to packetization performed in each stage can be reduced.
  • FIG. 5 is a block diagram of a receiving device that performs a decoding and de-multiplexing method corresponding to the encoding and multiplexing method illustrated in FIG. 3, according to one embodiment of the present invention.
  • a base layer stream and an enhancement layer stream received via a single transmission channel or different transmission channels due to hierarchical modulation or the like are decoded by corresponding channel decoders. Then, the decoded base layer stream is divided into section data and PES streams by a base layer TS demultiplexer 510, and the decoded enhancement layer stream is divided into section data and PES streams by an enhancement layer TS demultiplexer 511.
  • synchronization between streams inferred from an identical time clock can be achieved based on the value of a PCR inserted into an audio TS packet which is transmitted at relatively regular intervals.
  • FIG. 6 is a flowchart illustrating the decoding and de-multiplexing method performed in the receiving device of FIG. 5.
  • program map table (PMT) information included in the PAT is interpreted in order to search for a PMT from a base layer TS.
  • the found PMT is interpreted in order to extract a relation table that shows identifiers ESJD of various types of ESs and packet identifiers (PIDs).
  • TS packets of different types are separated from each other by referring to corresponding PIDs according to the extracted relation table, and then ES information is extracted from each of the separated TS packets. Then, ODs included in the ES information are interpreted so as to write a list of related information about each object and each ES.
  • an enhancement layer TS packet is extracted simultaneously with initial extraction of a base layer TS packet, and synchronization between the base layer TS packet and the enhancement layer TS packet is primarily performed.
  • operation S650 includes S651 through S654, similar to operation S640 performed when basic services are provided, a PAT and a PMT which are transmitted in the enhancement layer TS packet are interpreted, and thus each type of ES transmitted via an enhancement layer channel is extracted and a list of information about each object and each ES is written.
  • the extracted ESs (e.g., a video ES, an audio ES, and a data ES) from a base layer and an enhancement layer are combined with related information about the extracted ESs. Thereafter, in operations S670 and S680, a video and/or audio stream is decoded and constructs a scene before the data is reproduced.
  • FIG. 7 illustrates a receiving device that performs a decoding and de-multiplexing method according to another embodiment of the present invention, when information such as IOD, OD/BIFS, etc., is inserted into the bitstream and transmitted through one of a base layer and an enhancement layer.
  • the decoding and de-multiplexing method performed in the receiving device illustrated in FIG. 7 corresponds to the encoding and multiplexing method illustrated in FIG. 4.
  • the receiving device illustrated in FIG. 7 is different from the receiving device according to the first embodiment illustrated in FIG. 5 in that a section interpreter for interpreting enhancement layer IOD and OD/BIFS information is not included and information about an enhancement layer is incorporated into a PSI section for a base layer and transmitted. Accordingly, the receiving device illustrated in FIG. 7 extracts the enhancement layer IOD and OD/BIFS information from the base layer PSI section and transmits the extracted information to a scene construction unit.
  • FIG. 8 is a flowchart illustrating the decoding and de-multiplexing method performed in the receiving device of FIG. 7.
  • the decoding and de-multiplexing method illustrated in FIG. 8 is the same as that illustrated in FIG. 6.
  • the decoding and de-multiplexing method illustrated in FIG. 8 is different from that illustrated in FIG. 6 in that interpretations of a PMT and an OD are performed for only the base layer and pieces of information about the two layers are simultaneously extracted based on the interpretations and thus only incorporation of different types of ESs is performed.
  • both a mapping relationship between base layer streams and a mapping relationship between enhancement layer streams are added to a first loop and a second loop and described therein.
  • a receiving terminal extracts corresponding packets from a base layer MPEG-2 TS and an enhancement layer MPEG-2 TS by using the added mapping relationships.
  • an OD stream is also transmitted through only the basic layer, and an ES Descriptor described to construct a scene is additionally inserted into the base layer MPEG-2 TS so as to describe both a video ES, an audio ES, and a data ES for a base layer and a video ES, an audio ES, and a data ES for an enhancement layer.
  • a PCR may be inserted into an audio TS packet that is generated by a relatively small amount and at relatively regular intervals. Accordingly, even a PTS and an OCR may be inserted into only an audio stream
  • FIG. 9 illustrates a decoding and de-multiplexing method according to another embodiment of the present invention.
  • a PMT is made up of two types of loops, namely, first and second loops 910 and
  • the first loop 910 is made up of ES_Descriptors including contents about a scene description and an object description, and the second loop 920 maps PIDs,
  • both the mapping relationship between base layer streams and the mapping relationship between enhancement layer streams are added to the two loops and described therein.
  • the receiving device extracts corresponding packets from a base layer MPEG-2 TS and an enhancement layer MPEG-2 TS by using the added mapping relationships.
  • an OD stream is also transmitted through only a base layer channel, and an ES_Descriptor described to construct a scene is additionally inserted into the base layer MPEG-2 TS so as to describe both a video ES, an audio ES, and a data ES for a base layer and a video ES, an audio ES, and a data ES for an enhancement layer.
  • FIG. 10 illustrates an MPEG-4 OD according to an embodiment of the present invention.
  • a base layer stream and an enhancement layer stream may be defined as different ODs. However, in the present embodiment, two ES descriptors for a base layer and an enhancement are included in a single OD in a subordinate relationship.
  • This subordinate relationship may be expressed using "StreamDependanceFlag” and "dependsOn_ES_ID” of an MPEG-4 ES descriptor.
  • a location of an ES is designated using URL FIag in order to express that the ES itself exists in an enhancement layer.
  • a conventional terminal that recognizes only a base layer fails to recognize "ObjectTypelndication” information for an enhancement layer and thus secures compatibility.
  • a terminal for high-quality multimedia services according to the present invention recognizes the existence of a dependent stream and "ObjectTypelndication” information and thus also properly receives an enhancement layer stream.
  • FIG. 11 is a block diagram of a transmission device 1100 for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention.
  • the transmission device 1100 includes an encoding unit 1110, an SL packet transform unit 1120, a PES packet transform unit 1130, and a TS multiplexing unit 1140.
  • the encoding unit 1110 separates input multimedia contents into a base layer ES and an enhancement layer ES and encodes the base layer ES and the enhancement layer ES.
  • the SL packet transform unit 1120 transforms the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet and performs synchronization between the base layer SL packet and the enhancement layer SL packet.
  • the PES packet transform unit 1130 transforms the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet and performs synchronization between the base layer PES packet and the enhancement layer PES packet.
  • the SL packet transform unit 1120 performs synchronization by inserting time stamp information into the base layer SL packet and the enhancement layer SL packet by using OCR which is ascertained based on an identical STC.
  • the PES packet transform unit 1130 performs synchronization by inserting time stamp information into the base layer PES packet and the enhancement layer PES packet by using the PCR which is ascertained based on an identical STC. For example, the SL packet transform unit 1120 inserts a CTS as the time stamp information, and the PES packet transform unit 1130 inserts a PTS as the time stamp information.
  • the TS multiplexing unit 1140 multiplexes the PES packets according a base layer TS and an enhancement layer TS so as to generate TS packets. At this time, the TS multiplexing unit 1140 performs synchronization by inserting PCRs into the TS packets according to the base layer ES and the enhancement layer ES or by using an identical STC in the base layer ES and the enhancement layer ES.
  • FIG. 12 is a block diagram of a reception device for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention.
  • the receiving device includes a quality selection unit 1210, a decoding unit 1220, a TS de-multiplexing unit 1230, a PES de-packet transform unit 1240, and an SL de-packet transform unit 1250.
  • the quality selection unit 1210 determines, based on a selection of a user, whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received.
  • the decoding unit 1220 decodes the base layer stream and the enhancement layer stream so as to obtain TS packets.
  • the TS de-multiplexing unit 1230 demultiplexes the TS packets so as to obtain PES packets, and performs synchronization between the PES packets.
  • the F 1 ES de-packet transform unit 1240 decodes the PES packets obtained by the TS de-multiplexing unit 1230 so as to obtain SL packets, and performs synchronization between the SL packets.
  • the SL de-packet transform unit 1250 multiplexes the SL packets according to the base layer ES and the enhancement layer
  • the invention can also be embodied as computer readable codes on a computer readable recording medium.
  • the computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet).
  • the computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
  • the computer-readable media can distribute, sore and execute computer-readable codes in embedded-systems connected via a wireless network such as a sensor node.

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Abstract

A transmission device and receiving device for providing high-quality multimedia services in a digital multimedia broadcasting (DMB) transmission system is provided. The transmission device separates input multimedia contents into a base layer elementary stream and an enhancement layer elementary stream, encodes the base layer elementary stream and the enhancement layer elementary stream, transforms the base layer elementary stream and the enhancement layer elementary stream into a base layer SL packet and an enhancement layer SL packet, transforms the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet, and multiplexes the base layer PES packet and the enhancement layer PES packet according to a base layer elementary stream and an enhancement layer elementary stream and outputs a base layer TS packet and an enhancement layer TS packet.

Description

METHOD AND APPARATUS FOR PROVIDING HIGH-QUALITY MULTIMEDIA
SERVICE IN DMB SYSTEM
TECHNICAL FIELD The present invention relates to a media processing method and apparatus for providing high-quality multimedia services, by which a function for providing high-quality services is added to digital multimedia broadcasting and backward compatibility with existing receivers can be maintained.
The present invention is derived from a research project supported by the Information Technology (IT) Research & Development (R&D) program of the Ministry of Information and Communication (MIC) [2006-S-017-02, Development of High-Tech Terrestrial DMB Transmission].
BACKGROUND ART In conventional digital multimedia broadcasting (DMB), a multi-media service is multiplexed into a single transport stream and the multiplexed service is transmitted. In DMB broadcasting, multi-media services are provided through a single stream, and thus there is a limit in providing a high-quality service.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating a structure of a media processor of a conventional transmission unit in digital multimedia broadcasting (DMB);
FIG. 2 is a conceptual diagram illustrating a system for providing high-quality multimedia services in DMB, according to an embodiment of the present invention; FIG. 3 is a block diagram for illustrating an encoding and multiplexing method performed in an encoding unit, according to one embodiment of the present invention;
FIG. 4 is a block diagram for illustrating an encoding and multiplexing method performed in an encoding unit, according to another embodiment of the present invention; FIG. 5 is a block diagram of a receiving device that performs a decoding and de-multiplexing method corresponding to the encoding and multiplexing method illustrated in FIG. 3. FIG. 6 is a flowchart illustrating a decoding and de-multiplexing method performed in a decoding unit, according to one embodiment of the present invention;
FIG. 7 is a block diagram for describing a decoding and de-multiplexing method performed in a decoding unit, according to another embodiment of the present invention;
FIG. 8 is a flowchart of the decoding and de-multiplexing method illustrated in FIG. 7;
FIG. 9 illustrates a decoding and de-multiplexing method according to another embodiment of the present invention; FIG. 10 illustrates an MPEG-4 object descriptor (OD) used in the present invention;
FIG. 11 is a block diagram of a transmission device for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention; and FIG. 12 is a block diagram of a reception device for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION TECHNICAL PROBLEM
The present invention provides a transceiving method and apparatus by which a function for providing high-quality services is added to digital multimedia broadcasting and backward compatibility with existing receivers can be maintained.
TECHNICAL SOLUTION
The present invention provides a structure in which a transport stream (TS) is separated into a base layer TS and an enhancement layer TS, a conventional TS is transmitted via the base layer TS and additional multimedia service information for high-quality services is multiplexed and transmitted via the enhancement layer TS, so that services transmitted through different transport channels can be incorporated with each other and provided when needed.
In particular, when a hierarchical modulation function is given to a digital multimedia broadcasting (DMB) transmission system in order to divide a transmission mechanism into a base layer and an enhancement layer, basic-quality multimedia services can be provided to low-spec terminals such as cellular phones and high-quality multimedia services can provided to high-spec terminals.
ADVANTAGEOUS EFFECTS
The present invention proposes an apparatus and method of providing high-quality multimedia services in digital multimedia broadcasting (DMB), by which a function for providing high-quality services is added to DMB and compatibility with a conventional DMB network is possible so that a predetermined quality can be maintained with the conventional DMB network even without special machine changes.
BEST MODE
According to an aspect of the present invention, there is provided a transmission device for providing high-quality multimedia services in a DMB (digital multimedia broadcasting) transmission system, the transmission device comprising: an encoding unit separating input multimedia contents into a base layer ES (elementary stream) and an enhancement layer ES and encoding the base layer ES and the enhancement layer ES, respectively; an SL (synchronization layer) packet transform unit transforming the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet, respectively; a PES (program specific information) packet transform unit transforming the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet, respectively; and a TS (transport stream) multiplexing unit multiplexing the base layer PES packet and the enhancement layer PES packet, respectively, according to a base layer ES and an enhancement layer ES and outputting a base layer TS packet and an enhancement layer TS packet.
According to another aspect of the present invention, there is provided a receiving device for providing high-quality multimedia services in a DMB transmission system, the receiving device comprising: a quality selection unit determining whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received; a decoding unit decoding the base layer stream and the enhancement layer stream, respectively, and outputting a base layer TS packet and an enhancement layer TS packet, respectively; a TS de-multiplexing unit de-multiplexing the base layer and enhancement layer TS packets, respectively, so as to obtain a base layer PES packet and an enhancement layer PES packet, respectively; a PES de-packet transform unit decoding the base layer and enhancement layer PES packets, respectively, so as to obtain a base layer SL packet and an enhancement layer SL packet, respectively; and an SL de-packet transform unit multiplexing the base layer and enhancement SL packets so as to obtain a base layer ES and an enhancement layer ES.
According to another aspect of the present invention, there is provided a transmission method for providing high-quality multimedia services in a DMB transmission system, the transmission method comprising: separating input multimedia contents into a base layer ES and an enhancement layer ES and encoding the base layer ES and the enhancement layer ES; transforming the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet; transforming the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet; and multiplexing the base layer PES packet and the enhancement layer PES packet according to a base layer ES and an enhancement layer ES and outputting a base layer TS packet and an enhancement layer TS packet.
According to another aspect of the present invention, there is provided a receiving method for providing high-quality multimedia services in a DMB transmission system, the receiving method comprising: a quality selection operation of determining whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received; a decoding operation of decoding the base layer stream and the enhancement layer stream and outputting a base layer TS packet and an enhancement layer TS packet; a TS de-multiplexing operation of de-multiplexing the base layer and enhancement layer TS packets so as to obtain a base layer PES packet and an enhancement layer PES packet; a PES de-packet transform operation of decoding the base layer and enhancement layer PES packets so as to obtain a base layer SL packet and an enhancement layer SL packet; and an SL de-packet transform operation of multiplexing the base layer and enhancement SL packets so as to obtain a base layer ES and an enhancement layer ES. MODE OF THE INVENTION
The preferred embodiments of the present invention will now be explained with reference to the accompanying drawings. Like reference numerals or symbols in the drawings denote like elements. In order to clarify the sprit of the invention, descriptions of well known functions or constructions may be omitted.
FIG. 1 is a block diagram illustrating a structure of a media processor of a conventional transmission unit in digital multimedia broadcasting (DMB).
A video encoder encodes an incoming image signal in accordance with the video standard and an audio encoder encodes an incoming audio signal. An initial object descriptor (IOD) generator 110 generates IOD data which is based on the ISO/IEC 14496-1 standard. An object descriptor (OD)/BIFS (binary format for scenes) generator 120 generates an OD/BIFS stream which is based on the ISO/IEC 14496-1 standard.
An SL packetizer 130 (SL - synchronization layer) generates an SL packet, which is a packet for synchronization between incoming media streams, and follows the
ISO/IEC 14496-1 system standard. In other words, the SL packetizer 130 receives an
OD/BIFS stream, a video elementary stream (ES), an audio ES, and additional data and generates an OD/BIFS SL packet, a video SL packet, an audio SL packet, and additional data packet corresponding to the OD/BIFS stream, the video ES, the audio ES, and the additional data, respectively.
A section generator (or a PSI generator 140) (PSI - program specific information) generates a section including received IOD/OD/BIFS, and follows the ISO/IEC 13818-1 standard. The section generator 140 includes a 14496 section packetization unit for packetizing an SL packet (i.e., the OD/BIFS SL packet) into a 14496 section, and a PSI packetization unit for generating PSI information including the IOD data.
A PES packetizer 150 (PES - program elementary stream ) receives and PES-packetizes the SL packets, and follows the ISO/IEC 13818-1 standard. A transport stream (TS) multiplexer 160 receives the section and a PES packet, which is a result of the PES packetization, from the section generator 140 and the PES packetizer 150, respectively, and multiplexes the section and the PES packet to an MPEG-2 TS. FIG. 2 is a conceptual diagram illustrating a system for providing high-quality multimedia services in DMB, according to an embodiment of the present invention.
In conventional multimedia broadcasting, multimedia services are multiplexed and transmitted through a single transport stream. However, in the present invention, a hierarchical modulation function is given to a DMB transmission system so as to separate a TS into a base layer TS and an enhancement layer TS, and thus a conventional TS is transmitted as the base layer TS and additional multimedia service information for high-quality services is transmitted in the enhancement layer TS.
Therefore, basic-quality multimedia services can be provided to low-spec terminals such as cellular phones, and high-quality multimedia services can be provided to high-spec terminals.
An encoding unit includes a high-quality video encoder 210, a high-quality audio encoder 220, and an additional data encoder 230.
The high-quality video encoder 210 may be a scalable video encoder, a stereo 3D video encoder, a multi-view video encoder, a multi-channel audio encoder, or the like. The high-quality video encoder 210 separates an input stream into a base layer video ES 211 and an enhancement layer video ES 212 and outputs the base layer video ES 211 and the enhancement layer video ES 212 to a media system encoding and multiplexing unit 240. The media system encoding and multiplexing unit 240 multiplexes the base layer video ES 211 and the enhancement layer video ES 212.
Similarly, the high-quality audio encoder 220 separates an input stream into a base layer audio ES and an enhancement layer audio ES and outputs the base layer audio ES and the enhancement layer audio ES to the media system encoding and multiplexing unit 240. The media system encoding and multiplexing unit 240 multiplexes the base layer audio ES and the enhancement layer audio ES. Similarly, the additional data encoder 230 separates an input stream into a base layer data ES and an enhancement layer data ES and outputs the base layer data ES and the enhancement layer data ES to the media system encoding and multiplexing unit 240.
The media system encoding and multiplexing unit 240 multiplexes the base layer data ES and the enhancement layer data ES.
The media system encoding and multiplexing unit 240 multiplexes each of the video, audio, and data ESs respectively received from the high-quality video encoder 210, the high-quality audio encoder 220, and the additional data encoder 230 into a base layer and an enhancement layer. Thus, a transmission unit 250 can transmit the multiplexed video, audio, and data ESs via either an identical channel or different channels.
A decoding unit includes a high-quality video decoder, a high-quality audio decoder, a reception unit, and a media system decoding and de-multiplexing unit 260.
FIGS. 3 and 4 illustrate embodiments of media system encoding and multiplexing methods performed in the encoding unit illustrated in FIG. 2, which are proposed in order to provide high-quality multimedia services in DMB. FIG. 5 is a block diagram of a receiving device that performs a decoding and de-multiplexing method corresponding to the encoding and multiplexing method illustrated in FIG. 3. FIGS. 6 and 7 illustrate decoding and de-multiplexing methods performed in a decoding unit in order to provide high-quality multimedia services in DMB, according to embodiments of the present invention. FIG. 8 is a flowchart illustrating the decoding and de-multiplexing method illustrated in FIG. 7. FIG. 9 illustrates a decoding and de-multiplexing method according to another embodiment of the present invention.
FIG. 3 is a block diagram of a media system encoding and multiplexing unit in the encoding unit illustrated in FIG. 2, according to one embodiment of the present invention.
In the media system encoding and multiplexing unit 240 of FIG. 2, an SL packetizer 310 receives a base layer ES and an enhancement layer ES from each of the high-quality video encoder 210, the high-quality audio encoder 220, and the additional data encoder 230 and transforms the received base layer ESs and the enhancement layer ESs into base layer SL packets and enhancement layer SL packets. The SL packetizer 310 synchronizes streams (i.e., video, audio, and data ESs) for a base layer with the corresponding streams (i.e., video, audio, and data ESs) for an enhancement layer in a way similar to the way in which the SL packetizer 130 of FIG. 1 synchronizes video, audio, and data streams. For example, in order to perform this synchronization in the SL packetizer 310, time stamp information such as a composition time stamp (CTS) is inserted into the streams based on an identical OCR (Object Clock Reference) inferred from identical system time clocks (STCs).
A PES packetizer 320 PES-packetizes the received SL packets in the same or similar way as used in the SL packetizer 130 of FIG. 1 , and inserts time stamps such as presentation time stamps (PTSs) into the base layer ESs and the enhancement layer ESs based on an identical system clock in order to perform synchronization.
Each pair of a pair of IOD generators 350 and 351 , a pair of OD/BIFS generators 360 and 361 , and a pair of section generators 370 and 371 exists for a base layer stream and an enhancement layer stream, and each pair generates a base layer stream and an enhancement layer stream.
In contrast with the conventional media system encoding and multiplexing unit illustrated in FIG. 1 including the single TS multiplexer 160, the media system encoding and multiplexing unit of FIG. 3 includes two TS multiplexers, namely, a base layer TS multiplexer 330 and an enhancement layer TS multiplexer 340. The media system encoding and multiplexing unit of FIG. 3 multiplexes packetized PES streams and PSI section/14496 section streams according to a base layer and an enhancement layer.
The two TS multiplexers 330 and 340 generate a base layer MEPG-2 TS packet and an enhancement layer MEPG-2 TS packet by using an identical STC, and also generate a program clock reference (PCR)_by using the identical STC. The use of the identical STC enables the two TSs to be synchronized over the entire transceiving system.
In this case, in order to minimize an increase in surplus TS packets that may be generated by inserting a PCR into an MPEG-2 TS packet, a PCR may be inserted into an audio TS packet that is generated by a relatively small amount and at relatively regular intervals. Accordingly, a PTS and an OCR may also be inserted into only an audio stream
Finally, the multiplexed base layer MPEG-2 TS packet and the multiplexed enhancement layer MPEG-2 TS packet are respectively encoded in channel encoders suitable for a base layer transmission channel and an enhancement transmission channel, and then respectively transmitted to the base layer transmission channel and the enhancement transmission channel. When a hierarchical modulation method for use in DMB is used, a base layer stream and an enhancement layer stream may be mapped into a single symbol and transmitted to a single radio frequency (RF) channel. In the embodiment illustrated in FIG. 3, the number of unnecessary transmission packets generated due to duplicate transmission can be minimized by transmitting a PSI which is constructed with only information required for an enhancement layer. More specifically, in a method of constructing base layer PSI information 380 and enhancement layer PSI information 381 according to an embodiment of the present invention, the base layer PSI information 380, which corresponds to the prior art, is transmitted without changes, and only PMT/OD/BIFS information added for an enhancement layer is extracted and included in the enhancement layer PSI information 381. A receiving terminal can extract corresponding packets from MPEG-2 TSs of the two layers by using the base layer PSI information 380 and the enhancement layer PSI information 381.
In another embodiment, the conventional base layer PSI information 380 is transmitted without changes, and the enhancement layer PSI information 381 contains extended PMT/OD/BIFS information obtained by adding information for an enhancement layer to PMT/OD/BIFS information for a basic layer. Thus, the receiving terminal can extract corresponding packets from MPEG-2 TSs of the two layers by using the base layer PSI information 380 and the enhancement layer PSI information 381 including the extended PMT/OD/BIFS information.
According to the present invention, when provision of high-quality services is selected, high-quality services can be simply provided through only an analysis of enhancement layer PSI information without need to analyze base layer PSI information. In addition, the operation of extracting information required for an enhancement layer can be simplified by not performing a process of analyzing the base layer PSI information.
FIG. 4 is a block diagram for illustrating a media system encoding and multiplexing method performed in an encoding unit, according to another embodiment of the present invention. The media system encoding and multiplexing method illustrated in FIG. 4 is the same as that illustrated in FIG. 3 in terms of synchronization, and is different therefrom in that a base layer and an enhancement layer share a single IOD generator, a single OD/BIFS generator, and a section generator.
According to the current embodiment, IOD, OD, and BIFS, which are additional data transmitted from a transmission side, are transmitted through only a base layer so that a terminal extracts ESs for two layers (i.e., a base layer and an enhancement layer) and constructs a scene by using the extracted ESs, thereby increasing transmission efficiency. In other words, since IOD, OD, and BIFS, which are relatively small amounts of data required for the two layers, are transmitted through only a single channel (i.e., a base layer channel), overhead generated due to packetization performed in each stage can be reduced. FIG. 5 is a block diagram of a receiving device that performs a decoding and de-multiplexing method corresponding to the encoding and multiplexing method illustrated in FIG. 3, according to one embodiment of the present invention.
First, a base layer stream and an enhancement layer stream received via a single transmission channel or different transmission channels due to hierarchical modulation or the like are decoded by corresponding channel decoders. Then, the decoded base layer stream is divided into section data and PES streams by a base layer TS demultiplexer 510, and the decoded enhancement layer stream is divided into section data and PES streams by an enhancement layer TS demultiplexer 511.
Since a transmission side has already inserted PCRs into MPEG-2 TSs of the two layers by using an identical STC so that the PCRs are consecutive to one another in each of the MPEG-2 TSs, only one of the base layer TS demultiplexer 510 and the enhancement layer TS demultiplexer 511 extracts the PCRs, and the extracted PCRs are used when the STC is reproduced. In this case, in order to synchronize media reproduction between two layers, the MPEG-2 TSs for the two layers should be synchronized with each other before passing through the base layer TS demultiplexer
510 and the enhancement layer TS demultiplexer 511 , by buffering stream buffers based on the PCR.
In order to achieve this, synchronization between streams inferred from an identical time clock can be achieved based on the value of a PCR inserted into an audio TS packet which is transmitted at relatively regular intervals.
FIG. 6 is a flowchart illustrating the decoding and de-multiplexing method performed in the receiving device of FIG. 5.
[Case where provision of basic services is selected] A flowchart of signals when a user selects provision of only basic services will now be described.
In operations S610 and S611 , when a packet stream encoded using an existing MPEG-4 system is inserted into an MPEG-2 TS and transmitted, a PAT (Program Association Table) in which a PID is 0x0000 is obtained from the MPEG-2 TS in order to access media data which is multiplexed and transmitted.
In operation S630, program map table (PMT) information included in the PAT is interpreted in order to search for a PMT from a base layer TS. The found PMT is interpreted in order to extract a relation table that shows identifiers ESJD of various types of ESs and packet identifiers (PIDs).
In operation S640 and S641 through S644, TS packets of different types are separated from each other by referring to corresponding PIDs according to the extracted relation table, and then ES information is extracted from each of the separated TS packets. Then, ODs included in the ES information are interpreted so as to write a list of related information about each object and each ES.
Thereafter, in operations S670 and S680, a video or audio stream is decoded, a scene is constructed with related information extracted due to the decoding, and data is reproduced.
[Case where provision of high-quality services is selected]
A flowchart of signals when a user selects provision of high-quality services will now be described.
In operations S611 and S621 , when a user selects provision of high-quality services, an enhancement layer TS packet is extracted simultaneously with initial extraction of a base layer TS packet, and synchronization between the base layer TS packet and the enhancement layer TS packet is primarily performed.
In operations S631 and S650, wherein operation S650 includes S651 through S654, similar to operation S640 performed when basic services are provided, a PAT and a PMT which are transmitted in the enhancement layer TS packet are interpreted, and thus each type of ES transmitted via an enhancement layer channel is extracted and a list of information about each object and each ES is written.
In operation S661 , the extracted ESs (e.g., a video ES, an audio ES, and a data ES) from a base layer and an enhancement layer are combined with related information about the extracted ESs. Thereafter, in operations S670 and S680, a video and/or audio stream is decoded and constructs a scene before the data is reproduced.
FIG. 7 illustrates a receiving device that performs a decoding and de-multiplexing method according to another embodiment of the present invention, when information such as IOD, OD/BIFS, etc., is inserted into the bitstream and transmitted through one of a base layer and an enhancement layer.
The decoding and de-multiplexing method performed in the receiving device illustrated in FIG. 7 corresponds to the encoding and multiplexing method illustrated in FIG. 4.
The receiving device illustrated in FIG. 7 is different from the receiving device according to the first embodiment illustrated in FIG. 5 in that a section interpreter for interpreting enhancement layer IOD and OD/BIFS information is not included and information about an enhancement layer is incorporated into a PSI section for a base layer and transmitted. Accordingly, the receiving device illustrated in FIG. 7 extracts the enhancement layer IOD and OD/BIFS information from the base layer PSI section and transmits the extracted information to a scene construction unit.
FIG. 8 is a flowchart illustrating the decoding and de-multiplexing method performed in the receiving device of FIG. 7. When a user selects provision of only basic services, the decoding and de-multiplexing method illustrated in FIG. 8 is the same as that illustrated in FIG. 6. However, when the user selects provision of high-quality services, the decoding and de-multiplexing method illustrated in FIG. 8 is different from that illustrated in FIG. 6 in that interpretations of a PMT and an OD are performed for only the base layer and pieces of information about the two layers are simultaneously extracted based on the interpretations and thus only incorporation of different types of ESs is performed.
In the decoding and de-multiplexing method according to another embodiment of FIG. 8, both a mapping relationship between base layer streams and a mapping relationship between enhancement layer streams are added to a first loop and a second loop and described therein. A receiving terminal extracts corresponding packets from a base layer MPEG-2 TS and an enhancement layer MPEG-2 TS by using the added mapping relationships.
In addition, in the decoding and de-multiplexing method according to another embodiment of FIG. 8, an OD stream is also transmitted through only the basic layer, and an ES Descriptor described to construct a scene is additionally inserted into the base layer MPEG-2 TS so as to describe both a video ES, an audio ES, and a data ES for a base layer and a video ES, an audio ES, and a data ES for an enhancement layer. As illustrated in FIG. 6, in order to minimize an increase in surplus TS packets that may be generated by inserting PCRs into the MPEG-2 TS packets, a PCR may be inserted into an audio TS packet that is generated by a relatively small amount and at relatively regular intervals. Accordingly, even a PTS and an OCR may be inserted into only an audio stream
FIG. 9 illustrates a decoding and de-multiplexing method according to another embodiment of the present invention.
A PMT is made up of two types of loops, namely, first and second loops 910 and
920. The first loop 910 is made up of ES_Descriptors including contents about a scene description and an object description, and the second loop 920 maps PIDs,
Stream_type, etc. of the MPEG-2 TS packets for transmitting ESs which have been described in the ES_Descriptors.
In the decoding and de-multiplexing method according to another embodiment described above in conjunction with FIGS. 7 and 8, both the mapping relationship between base layer streams and the mapping relationship between enhancement layer streams are added to the two loops and described therein. The receiving device extracts corresponding packets from a base layer MPEG-2 TS and an enhancement layer MPEG-2 TS by using the added mapping relationships.
In addition, in the decoding and de-multiplexing method according to the second embodiment, an OD stream is also transmitted through only a base layer channel, and an ES_Descriptor described to construct a scene is additionally inserted into the base layer MPEG-2 TS so as to describe both a video ES, an audio ES, and a data ES for a base layer and a video ES, an audio ES, and a data ES for an enhancement layer.
FIG. 10 illustrates an MPEG-4 OD according to an embodiment of the present invention.
A base layer stream and an enhancement layer stream may be defined as different ODs. However, in the present embodiment, two ES descriptors for a base layer and an enhancement are included in a single OD in a subordinate relationship.
This subordinate relationship may be expressed using "StreamDependanceFlag" and "dependsOn_ES_ID" of an MPEG-4 ES descriptor. A location of an ES is designated using URL FIag in order to express that the ES itself exists in an enhancement layer. The base layer stream, which is an independent stream, is set as "ObjectTypelndication=0x21 (AVC), StreamType=0x04(visual stream)" according to an AVC codec which is a conventional standard. The enhancement layer stream, which is a dependent stream, is encoded according to an SVC codec or any of a plurality of other codecs and is thus set as "ObjectTypelndication=0xC0(user private), StreamType=0x04(visual stream), StreamDependanceFlag=1 , dependsOn_ES_ID=101 (base layer IESJD)".
Existence of the dependent base layer stream in an enhancement layer instead of in a base layer is expressed as "URL_Flag=1 , URLstring[URLIength]= xx (location of enhancement layer)".
Accordingly, a conventional terminal that recognizes only a base layer fails to recognize "ObjectTypelndication" information for an enhancement layer and thus secures compatibility. A terminal for high-quality multimedia services according to the present invention recognizes the existence of a dependent stream and "ObjectTypelndication" information and thus also properly receives an enhancement layer stream.
FIG. 11 is a block diagram of a transmission device 1100 for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention. The transmission device 1100 includes an encoding unit 1110, an SL packet transform unit 1120, a PES packet transform unit 1130, and a TS multiplexing unit 1140.
The encoding unit 1110 separates input multimedia contents into a base layer ES and an enhancement layer ES and encodes the base layer ES and the enhancement layer ES.
The SL packet transform unit 1120 transforms the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet and performs synchronization between the base layer SL packet and the enhancement layer SL packet. The PES packet transform unit 1130 transforms the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet and performs synchronization between the base layer PES packet and the enhancement layer PES packet. The SL packet transform unit 1120 performs synchronization by inserting time stamp information into the base layer SL packet and the enhancement layer SL packet by using OCR which is ascertained based on an identical STC. The PES packet transform unit 1130 performs synchronization by inserting time stamp information into the base layer PES packet and the enhancement layer PES packet by using the PCR which is ascertained based on an identical STC. For example, the SL packet transform unit 1120 inserts a CTS as the time stamp information, and the PES packet transform unit 1130 inserts a PTS as the time stamp information.
The TS multiplexing unit 1140 multiplexes the PES packets according a base layer TS and an enhancement layer TS so as to generate TS packets. At this time, the TS multiplexing unit 1140 performs synchronization by inserting PCRs into the TS packets according to the base layer ES and the enhancement layer ES or by using an identical STC in the base layer ES and the enhancement layer ES.
FIG. 12 is a block diagram of a reception device for providing high-quality multimedia services in a DMB transmission system, according to an exemplary embodiment of the present invention.
The receiving device includes a quality selection unit 1210, a decoding unit 1220, a TS de-multiplexing unit 1230, a PES de-packet transform unit 1240, and an SL de-packet transform unit 1250. The quality selection unit 1210 determines, based on a selection of a user, whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received.
The decoding unit 1220 decodes the base layer stream and the enhancement layer stream so as to obtain TS packets. The TS de-multiplexing unit 1230 demultiplexes the TS packets so as to obtain PES packets, and performs synchronization between the PES packets.
The F1ES de-packet transform unit 1240 decodes the PES packets obtained by the TS de-multiplexing unit 1230 so as to obtain SL packets, and performs synchronization between the SL packets. The SL de-packet transform unit 1250 multiplexes the SL packets according to the base layer ES and the enhancement layer
ES.
The invention can also be embodied as computer readable codes on a computer readable recording medium. The computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. Also, the computer-readable media can distribute, sore and execute computer-readable codes in embedded-systems connected via a wireless network such as a sensor node. While this invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The preferred embodiments should be considered in descriptive sense only and not for purposes of limitation. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

Claims

1. A transmission device for providing high-quality multimedia services in a DMB (digital multimedia broadcasting) transmission system, the transmission device comprising: an encoding unit separating input multimedia contents into a base layer ES (elementary stream) and an enhancement layer ES and encoding the base layer ES and the enhancement layer ES, respectively; an SL (synchronization layer) packet transform unit transforming the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet, respectively; a PES (program specific information) packet transform unit transforming the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet, respectively; and a TS (transport stream) multiplexing unit multiplexing the base layer PES packet and the enhancement layer PES packet, respectively, according to a base layer ES and an enhancement layer ES and outputting a base layer TS packet and an enhancement layer TS packet.
2. The transmission device of claim 1 , wherein the SL packet transform unit and the PES packet transform unit respectively perform synchronization between the SL packets and synchronization between the PES packets by, respectively, inserting time stamp information into the SL packets and the PES packets by using OCR (Object Clock Reference) which is ascertained based on an identical STC (system time clock).
3. The transmission device of claim 2, wherein the SL packet transform unit inserts a CTS (composition time stamp) as the time stamp information.
4. The transmission device of claim 2, wherein the PES packet transform unit inserts a PTS (Presentation Time Stamp) as the time stamp information.
5. The transmission device of claim 1 , wherein the TS multiplexing unit uses an identical STC in the base layer ES and the enhancement layer ES when generating the TS packets.
6. The transmission device of claim 1 , wherein the TS multiplexing unit inserts PCRs (Program reference clocks) in the base layer ES and the enhancement layer ES, respectively.
7. The transmission device of claim 1 , further comprising an additional data generation unit for generating additional data for use in scene construction, respectively, on the basis of the base layer ES and the enhancement layer ES separated in the encoding unit.
8. The transmission device of claim 7, further comprising a section generation unit for generating a PSI (PSI - program specific information) section for the base layer ES and a PSI section for the enhancement layer ES, wherein each of the PSI sections comprises the additional data.
9. The transmission device of claim 7, wherein each of the additional data are respectively transmitted to the base layer ES and the enhancement layer ES, wherein, additional data information appended only for an enhancement layer is transmitted to the enhancement layer ES.
10. The transmission device of claim 7, wherein both the additional data for the base layer and for the enhancement layer are transmitted only through the base layer ES, and when the additional data for the enhancement layer is lacking, only the additional data for the base layer is transmitted to the base layer ES.
11. A receiving device for providing high-quality multimedia services in a DMB transmission system, the receiving device comprising: a quality selection unit determining whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received; a decoding unit decoding the base layer stream and the enhancement layer stream, respectively, and outputting a base layer TS packet and an enhancement layer TS packet, respectively; a TS de-multiplexing unit de-multiplexing the base layer and enhancement layer TS packets, respectively, so as to obtain a base layer PES packet and an enhancement layer PES packet, respectively; a PES de-packet transform unit decoding the base layer and enhancement layer PES packets, respectively, so as to obtain a base layer SL packet and an enhancement layer SL packet, respectively; and an SL de-packet transform unit multiplexing the base layer and enhancement SL packets so as to obtain a base layer ES and an enhancement layer ES.
12. The receiving device of claim 11 , wherein the PES de-packet transform unit and the SL de-packet transform unit perform synchronization between the PES packets and synchronization between the SL packets, respectively, on the basis of inserted time stamp information that uses OCR which is ascertained based on an identical STC.
13. The receiving device of claim 12, wherein the PES de-packet transform unit performs synchronization by using a PTS inserted as the time stamp information
14. The receiving device of claim 12, wherein the SL de-packet transform unit performs synchronization by using a CTS inserted as the time stamp information.
15. The receiving device of claim 12, wherein the TS de-multiplexing unit performs synchronization by using a PCR included in one of the base layer ES and the enhancement layer ES.
16. The receiving device of claim 11 , wherein additional data for use in scene construction, which has been inserted in a stream transmitted by a transmission unit of the DMB transmission system, is received through each of the base layer ES and the enhancement layer ES, and additional data information added for only the enhancement layer is extracted from the enhancement layer ES.
17. The receiving device of claim 11 , wherein additional data for use in scene construction, which has been inserted in a stream transmitted by a transmission unit of the DMB transmission system, is received through the base layer ES, wherein the additional data information comprises additional data for the base layer and additional data for the enhancement layer.
18. The receiving device of claim 11 , wherein additional data information for use in scene construction, which has been inserted in a stream transmitted by a transmission unit of the DMB transmission system, is received through only the base layer ES.
19. The receiving device of any one of claims 16 through 18, wherein the additional data information comprises PSI, IOD (initial object descriptor), OD, and BIFS (binary format for scenes) information.
20. A transmission method for providing high-quality multimedia services in a DMB transmission system, the transmission method comprising: separating input multimedia contents into a base layer ES and an enhancement layer ES and encoding the base layer ES and the enhancement layer ES; transforming the base layer ES and the enhancement layer ES into a base layer SL packet and an enhancement layer SL packet; transforming the base layer SL packet and the enhancement layer SL packet into a base layer PES packet and an enhancement layer PES packet; and multiplexing the base layer PES packet and the enhancement layer PES packet according to a base layer ES and an enhancement layer ES and outputting a base layer TS packet and an enhancement layer TS packet.
21. The transmission method of claim 20, wherein the transforming into the SL packets and the transforming into the PES packets comprise performing synchronization between the SL packets and synchronization between the PES packets, respectively, by inserting time stamp information into the SL packets and time stamp information into the PES packets by using OCR which is ascertained based on an identical STC.
22. The transmission method of claim 21 , wherein in the transforming into the SL packets, a CTS is inserted as the time stamp information.
23. The transmission method of claim 21 , wherein in the transforming into the PES packets, a PTS is inserted as the time stamp information.
24. The transmission method of claim 20, wherein in the TS multiplexing, an identical STC in the base layer ES and the enhancement layer ES is used when generating the TS packets.
25. The transmission method of claim 20, wherein in the TS multiplexing, PCRs are inserted into the base layer ES and the enhancement layer ES.
26. The transmission method of claim 20, further comprising generating additional data for use in scene construction on the basis of the base layer ES and the enhancement layer ES obtained in the encoding of the base layer ES and the enhancement layer ES.
27. The transmission method of claim 26, further comprising generating a PSI section for the base layer ES and a PSI section for the enhancement layer ES, wherein each of the PSI sections comprises the additional data.
28. The transmission method of claim 26, wherein the additional data for the base layer and the additional data for the enhancement layer are transmitted to the base layer ES and the enhancement layer ES, respectively.
29. The transmission method of claim 26, wherein both the additional data for the base layer and the additional data for the enhancement layer are transmitted in the base layer ES.
30. A receiving method for providing high-quality multimedia services in a DMB transmission system, the receiving method comprising: a quality selection operation of determining whether only a base layer stream is to be received or both the base layer stream and an enhancement layer stream are to be received; a decoding operation of decoding the base layer stream and the enhancement layer stream and outputting a base layer TS packet and an enhancement layer TS packet; a TS de-multiplexing operation of de-multiplexing the base layer and enhancement layer TS packets so as to obtain a base layer PES packet and an enhancement layer PES packet; a PES de-packet transform operation of decoding the base layer and enhancement layer PES packets so as to obtain a base layer SL packet and an enhancement layer SL packet; and an SL de-packet transform operation of multiplexing the base layer and enhancement SL packets so as to obtain a base layer ES and an enhancement layer ES.
31. The receiving method of claim 30, wherein in the PES de-packet transform operation and the SL de-packet transform operation, synchronization between the PES packets and synchronization between the SL packets are performed, respectively, on the basis of inserted time stamp information that uses OCR which is ascertained based on an identical STC.
32. The receiving method of claim 31 , wherein in the PES de-packet transform operation, synchronization is performed by using a PTS inserted as the time stamp information
33. The receiving method of claim 31 , wherein in the SL de-packet transform operation, synchronization is performed by using a CTS inserted as the time stamp information.
34. The receiving method of claim 31 , wherein in the TS de-multiplexing operation, synchronization is performed by using a PCR included in one of the base layer ES and the enhancement layer ES.
35. The receiving method of claim 30, wherein additional data information for use in scene construction, which has been inserted in a stream transmitted by a transmission unit of the DMB transmission system, is received through each of the base layer ES and the enhancement layer ES, and additional data added for only the enhancement layer is extracted from the enhancement layer ES.
36. The receiving method of claim 30, wherein additional data information for use in scene construction, which has been inserted in a stream transmitted by a transmission unit of the DMB transmission system, is received through the base layer ES, wherein the additional data information comprises additional data for the base layer and additional data for the enhancement layer.
37. The receiving method of claim 30, wherein additional data information for use in scene construction, which has been inserted in a stream transmitted by a transmission unit of the DMB transmission system, is received through only the base layer ES.
38. The receiving method of any one of claims 35 through 37, wherein the additional data information comprises PSI, IOD, OD, and BIFS information.
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