WO2010074399A2 - Appareil et procédé pour le multiplexage et le démultiplexage basé sur la diffusion multimédia numérique - Google Patents

Appareil et procédé pour le multiplexage et le démultiplexage basé sur la diffusion multimédia numérique Download PDF

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Publication number
WO2010074399A2
WO2010074399A2 PCT/KR2009/006287 KR2009006287W WO2010074399A2 WO 2010074399 A2 WO2010074399 A2 WO 2010074399A2 KR 2009006287 W KR2009006287 W KR 2009006287W WO 2010074399 A2 WO2010074399 A2 WO 2010074399A2
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Prior art keywords
section
object information
enhancement layer
base layer
stream
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PCT/KR2009/006287
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English (en)
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WO2010074399A3 (fr
Inventor
Kugjin Yun
Gwangsoon Lee
Namho Hur
Hyun Lee
Bongho Lee
Kwang-Yong Kim
Kyutae Yang
Jong-Soo Lim
Jinwoong Kim
Soo-In Lee
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Electronics And Telecommunications Research Institute
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Priority to CN200980157200.5A priority Critical patent/CN102326387B/zh
Publication of WO2010074399A2 publication Critical patent/WO2010074399A2/fr
Publication of WO2010074399A3 publication Critical patent/WO2010074399A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4341—Demultiplexing of audio and video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • H04H20/72—Wireless systems of terrestrial networks
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234327—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by decomposing into layers, e.g. base layer and one or more enhancement layers
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2362—Generation or processing of Service Information [SI]
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2368—Multiplexing of audio and video streams
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • 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 an apparatus and method for multiplexing and demultiplexing and, more particularly, to an apparatus and method for multiplexing and demultiplexing based on a digital multimedia broadcasting (DMB).
  • DMB digital multimedia broadcasting
  • a digital multimedia broadcasting (DMB) transmitter provides various multimedia services such as an audio service and a video service in a mobile environment.
  • DMB transmitter includes a multiplexing apparatus for generating one transmission stream to provide a Quarter Video Graphics Array (QVGA) video service and a stereo audio service.
  • QVGA Quarter Video Graphics Array
  • a multiplexing apparatus of a typical DMB transmitter will be described with reference to Fig. 1.
  • Fig. 1 is a block diagram illustrating a multiplexing apparatus 200 in a DMB transmitter according to the related art.
  • the DMB transmitter includes a video encoder 101, an audio encoder 102, and a supplementary data encoder 103, and a multiplexing apparatus 200.
  • the video encoder 101 generates an elementary stream (ES) by encoding an input video signal based on the H.264/AVC standard.
  • the audio encoder 102 generates an audio elementary stream (ES) by encoding an input audio signal based on the ISO/IEC 14496-3 BSAC standard.
  • the supplementary data encoder 103 generates a supplementary data elementary stream (ES) by encoding a supplementary data signal.
  • the multiplexing apparatus 200 includes an initial object descriptor (IOD) generator 201, an object descriptor (OD)/binary format for scene (BIFS) generator 203, a SL packetizer 205, a section generator 207, a PES packetizer 209, a transport stream (TS) multiplexer 211.
  • IOD initial object descriptor
  • OD object descriptor
  • BIFS object descriptor/binary format for scene
  • SL packetizer 205 a section generator 207
  • PES packetizer 209 a transport stream (TS) multiplexer 211.
  • the IOD generator 201 generates IOD data based on the ISO/IEC 14496-1 standard and provides the generated IOD data to the section generator 207.
  • the IOD includes a profile and level information of a BIFS for reproducing an object description (OD) and a scene for a DMB AV service.
  • the OD is a set of ES descriptors that describe information about media data for forming a scene.
  • the OD connects an ES with a BIFS of each media data.
  • the BIFS describes a spatial/temporal location and action of video and audio objects forming a scene. That is, the IOD includes basic information that requires an initial setting of a DMB receiver for reproducing each media data included in one program. Table 1 shows an example of a typical IOD structure.
  • the OD/BIFS generator 203 generates an OD/BIFS stream based on the ISO/IEC 14496-1 standard and provides the generated OD/BIFS stream to the SL packetizer 205.
  • the SL packetizer 205 generates SL packets which are synchronized streams of input streams based on the ISO/IEC 14496-1 standard. That is, the SL packetizer 205 receives the OD/BIFS stream, the video ES, the audio ES, the supplementary data ES and generates the OD/BIFS SL packet, the video SL packet, the audio SL packet, and the supplementary data SL packet.
  • the section generator 207 generates program specific information (PSI) including a program map table (PMT) having an IOD descriptor and a program association table (PAT) including the location information of the PMT.
  • PSI program specific information
  • PMT program map table
  • PAT program association table
  • the section generator 207 also packetizes the OD/BIFS SL packet to a 14496 section.
  • Such a section generator 207 employs the ISO/IEC 13818-1 standard.
  • the PES packetizer 209 receives an OD/BIFS SL packet, a video SL packet, an audio SL packet, a supplementary data SL packet and generates a PES packet based on the ISO/IEC 13818-1 standard.
  • the TS multiplexer 211 generates a MPEG-2 TS by multiplexing input sections and PES packets.
  • the typical DMB transmitter having the multiplexing apparatus 200 shown in Fig. 1 performs a typical DMB AV service using one TS.
  • a typical DMB receiver incapable of performing the scalable service transmits unnecessary information. the transmitted unnecessary information becomes the overhead of the typical DMB receiver.
  • An embodiment of the present invention is directed to providing a multiplexing apparatus and method for providing a high definition/high quality DMB AV service to a Digital Multimedia Broadcasting (DMB) receiver capable of receiving a scalable service while sustaining comparability with a typical DMB receiver incapable of receiving a scalable service.
  • DMB Digital Multimedia Broadcasting
  • Another embodiment of the present invention is directed to providing a demultiplexing apparatus and method for enabling a DMB receiver capable of receiving a scalable service to receive a high definition/high quality DMB AV service.
  • a multiplexing apparatus including: a packetizer configured to receive and packetize an element stream and object information of a base layer and an element stream and object information of an enhancement layer; a section generator configured to generate a 14496 section including the object information of the base layer, a 14496 section including the object information of the enhancement layer, and a scalable contents service table (SCST) section having element stream information of the enhancement layer, and generate an initial object descriptor (IOD) having descriptors describing the object information of the base layer and the object information of the enhancement layer as a dependent or independent relation and a program specific information (PSI) section having a descriptor connecting the SCST; and a multiplexer configured to generate a base layer transport stream by multiplexing the packetized element stream and the packetized object information of the base layer, the 14496 section including the object information of the base layer, and the PSI section, and generate an enhancement layer transport stream by multiplexing the packetized element stream and the packetized object information of
  • a multiplexing method including receiving and packetizing an element stream and object information of a base layer and an element stream and object information of an enhancement layer; generating a 14496 section including the object information of the base layer, a 14496 section including the object information of the enhancement layer, and a scalable contents service table (SCST) section having element stream information of the enhancement layer, and generating an initial object descriptor (IOD) having descriptors describing the object information of the base layer and the object information of the enhancement layer as a dependent or independent relation and a program specific information (PSI) section having a descriptor connecting the SCST; and generating a base layer transport stream by multiplexing the packetized element stream and the packetized object information of the base layer, the 14496 section including the object information of the base layer, and the PSI section, and generating an enhancement layer transport stream by multiplexing the packetized element stream and the packetized object information of the enhancement layer, the 14496 section having the object information of the enhancement layer, the 14496 section having the object information of the
  • a demultiplexing apparatus including a demultiplexer configured to separate a base layer transport stream (TS) into a packetized element stream and packetized object information of a base layer and a 14496 section and a program specific information (PSI) section including object information of the base layer by demultiplexing the base layer TS, and separate an enhancement layer transport stream (TS) into a packetized element stream and packetized object information of an enhancement layer and a 14496 section and a scalable contents service table (SCST) section including object information of the enhancement layer by demultiplexing the enhancement layer TS; a section analyzer configured to parse the PSI section, the SCST section, the 14496 section including the object information of the base layer, and the 14496 section including the object information of the enhancement layer based on the parsed PSI section; and a depacketizer configured to depacketize the packetized element stream and the packetized object information of the base layer and the packetized element stream and the packetized
  • PSI program specific information
  • a demultiplexing method including: separating a base layer transport stream (TS) into a packetized element stream and packetized object information of a base layer and a 14496 section and a program specific information (PSI) section including object information of the base layer by demultiplexing the base layer TS, and separating an enhancement layer transport stream (TS) into a packetized element stream and packetized object information of an enhancement layer and a 14496 section and a scalable contents service table (SCST) section including object information of the enhancement layer by demultiplexing the enhancement layer TS; parsing the PSI section and parsing the SCST section, the 14496 section including the object information of the base layer, and the 14496 section including the object information of the enhancement layer based on the parsed PSI section; and depacketizing the packetized element stream and the packetized object information of the base layer and the packetized element stream and the packetized object information of the enhancement layer based on the parsing result from the section analyze
  • PSI program specific information
  • the multiplexing apparatus and method according to the present invention enables a transmitter to provide high quality AV contents to a DMB receiver capable of receiving a scalable service while sustaining comparability with a typical DMB receiver incapable of receiving the scalable service. Also, the multiplexing apparatus and method according to the present invention enables a transmitter to provide digital broadcasting based 3D realistic contents.
  • the demultiplexing apparatus and method according to the present invention enables a receiver to receive a high quality DMB AV service while sustaining comparability with a typical DMB receiver. Also, the demultiplexing apparatus and method according to the present invention enable a receiver to receive digital broadcasting based 3D realistic contents.
  • Fig. 1 is a block diagram illustrating a multiplexing apparatus in a DMB transmitter according to the related art.
  • Fig. 2 is a block diagram illustrating a multiplexing apparatus in accordance with an embodiment of the present invention.
  • Fig. 3 is a block diagram illustrating a multiplexing apparatus in accordance with another embodiment of the present invention.
  • Fig. 4 is a block diagram illustrating a demultiplexing apparatus in accordance with an embodiment of the present invention.
  • Figs. 5 and 6 are diagrams for describing operation of a demultiplexing apparatus in accordance with another embodiment of the present invention.
  • Fig. 2 is a block diagram illustrating a multiplexing apparatus in accordance with an embodiment of the present invention.
  • the multiplexing apparatus according to the present embodiment enables a transmitter to provide a 'spatial scalability' service.
  • the multiplexing apparatus includes an IOD generator 310, a base layer OD/BIFS generator 320, an enhancement layer OD/BIFS generator 330, a SL packetizer 340, a base layer section generator 350, an enhancement layer section generator 360, a PES packetizer 370, a base layer TS multiplexer 380, and an enhancement layer TS multiplexer 390.
  • the IOD generator 310 generates IOD data including descriptors object information of a base layer and object information of an enhancement layer.
  • the object information of the base layer denotes an OD stream and a BIFS stream of a base layer.
  • the object information of the enhancement layer indicates an OD stream and a BIFS stream of the enhancement layer. That is, the IOD generator 310 generates IOD data including descriptors for describing an OD stream and a BIFS stream of a base layer and descriptors for describing an OD stream and a BIFS stream of an enhancement layer.
  • Such an IOD data includes a profile and a BIFS and level information for reproducing an OD and a scene.
  • the OD is a set of ES-Descriptors that describe information about a base layer and an enhancement layer.
  • the OD connects an ES with a BIFS.
  • the BIFS describes spatial/temporal location and action of video/audio objects forming a scene.
  • the IOD data includes basic information requiring an initial setting of a DMB receiver for reproducing one program. Then, an IOD structure used in the multiplexing apparatus according to the present embodiment will be described with reference to Table 2.
  • the IOD data for initial setting of a DMB terminal is included only in a base layer TS generated by the base layer multiplexer 380 and is not included in an enhancement layer TS generated by the enhancement multiplexer 390.
  • the IOD data includes OD information and BIFS information of a base layer video for providing a typical DMB AV service.
  • the IOD data also includes OD information and BIFS information of an enhancement layer video for providing a scalable video service.
  • the OD information and the BIFS information of the enhancement layer video depend on the OD information and the BIFS information of the base layer video. It is because the scalable video service is equivalent to the combination of the base layer video service and the enhancement layer video service, and one scene is reproduced for a predetermined time. That is, in order to reproduce the base layer video and the enhancement layer video at the same time while producing one scene, the OD information and the BIFS information of the enhancement layer video should depend on the OD information and the BIFS information of the base layer video, respectively like table 2.
  • the base layer OD/BIFS generator 320 generates an OD/BIFS stream of a base layer video and provides the generated OD/BIFS stream to the SL packetizer 340.
  • the enhancement layer OD/BIFS generator 330 generates an OD/BIFS stream of the enhancement layer video and provides the generated OD/BIFS stream to the SL packetizer 340.
  • the SL packetizer 340 receives the base layer video ES, the base layer audio ES, the enhancement layer video ES, the OD/BIFS stream of the base layer video, and the OD/BIFS stream of the enhancement layer video. Then, the SL packetizer synchronizes the received streams and generates synchronized SL packets.
  • the base layer section generator 350 receives the IOD data generated from the IOD generator 310 and generates a program specific information (PSI) section including a program association table (PAT) and a program map table (PMT).
  • PSI program specific information
  • PAT program association table
  • PMT program map table
  • the PMT includes IOD to be transmitted at first to form a scene, packet identifier (PID) for each ES, and descriptors for each ES, thereby providing information of ES for media data forming a broadcasting program. Since the PMT expresses basic characteristics of constituent elements of one broadcasting program, one broadcasting program includes one PMT.
  • PID packet identifier
  • Table 3 shows a structure of a PMT generated used for DMB.
  • the descriptor of a row A includes IOD data.
  • the descriptor of a row B includes OD/BIFS of the base layer video, descriptors of a SL packet, and ES_ID.
  • the PMT used in the multiplexer according to the present embodiment further includes a descriptor ASS_Descriptor connecting a SCST table with the structure of Table 3.
  • a descriptor ASS_Descriptor denotes correlation between streams transmitted as TS of a base layer and an enhancement layer.
  • the descriptor ASS_Descriptor is included in the PMT of the base layer, it satisfies requirement that one broadcasting program includes one PMT. And, it is possible to service a high quality of AV contents to a DMB receiver capable of receiving a scalable service.
  • descriptor_tag indicates ASS_descriptor.
  • descriptor_length indicates a length of a descriptor.
  • auxiliary_PID denotes a packet identifier (PID of a scalable contents service table (SCST) showing information of a basic stream of an enhancement layer included in the enhancement layer TS in order to provide a scalable high definition/high quality service.
  • SCST scalable contents service table
  • the descriptor ASS_Descriptor describing the SCST is described as a type of a descriptor and as being included in the PMT. However, the descriptor ASS_Descriptor may be included in the PMT as a general field.
  • the base layer section generator 350 receives an OD/BIFS SL packet of the base layer video and generates a 14496 section.
  • the enhancement layer section generator 360 receives an OD/BIFS SL packet of the enhancement layer video and generates a 14496 section and a scalable contents service table (SCST).
  • SCST scalable contents service table
  • the SCST table is not used as a PMT structure like Table 3.
  • the SCST table is used to recognize a related TS ID of an enhancement layer basic stream, to recognize a scalable service type, and to describe information of a basic stream. Such a SCST is to describe information of the enhancement layer basic stream.
  • the scalable service according to the present embodiment should have one PMT structure as single broadcasting program. If a PMT structure is used for each layer, it is recognized as two broadcasting programs. Therefore, an additional SCST table is defined and used for the enhancement layer.
  • Table 5 is a SCST used in a multiplexer according to the present embodiment.
  • 'table_id' denotes a table ID of the SCST.
  • 'stream_type' describes a stream type of a typical DMB specification.
  • 'elementary_PID' indicates a PID of a TS packet transmitting ES included in the enhancement layer TS.
  • the descriptor of a raw A includes an ES_ID and a descriptor of an OD/BIFS SL packet of the enhancement layer video.
  • 'service_type_indicator' denotes a scalable service type and is used to identify a type of a transmitted scalable service.
  • Table 6 shows a scalable service type identified through 'service_type_indicator'.
  • the SCST includes 'service_type_indicator' to identify services.
  • the scalable data service provides various enhancement layer data service through the enhancement layer TS except a base layer data service transmitted through the base layer TS.
  • a user can receive a data service for weather information through the base layer TS and can receive further various data such as stack and news information by combining the enhancement layer TS.
  • New service types can be added into table 6 as well as the scalable service types, and a new service type may be added through combination of the scalable service types.
  • a 'Reserved' bit may be used to define new service types.
  • the scalable video service may have various service types such as "spatial scalability" and "SNR scalability".
  • SCST includes an additional descriptor or a field.
  • Table 7 shows a descriptor for identifying a scalable video service type.
  • 'scalability_type' denotes various scalable video service types.
  • Table 8 shows a scalable video service type. Also, it is possible to provide a hybrid type video service such as spatial and SNR scalable service. Such a service can be defined through 'Reserved' bit.
  • the PES packetizer 370 receives SL packets from the SL packetizer 340 and generates PES packets by PES-packetizing the received SL packets.
  • the base layer TS multiplexer 380 generates a base layer TS by multiplexing the PSI section, the 14496 section, the base layer OD/BIFS PES, the base layer video PES, and the base layer audio PES.
  • the enhancement layer TS multiplexer 390 generates an enhancement layer TS by multiplexing the SCST section, the 14496 section, and the enhancement layer video PES.
  • the multiplexing apparatus generates two base layer TSs and an enhancement layer TS in order to provide a scalable service while sustaining the comparability with the typical DMB receiver.
  • the base layer TS includes the PMT and the enhancement layer TS includes the SCST.
  • Such a PMT includes the descriptor 'ASS_descriptor' expressing relation of the base layer TS and the enhancement layer TS. Therefore, the multiplexing apparatus according to the present embodiment can provide a high quality of AV service while sustaining the comparability with a conventional DMB receiver based on the hierarchical transport stream structure generating two transport streams.
  • the multiplexing apparatus can provide various high definition/high quality contents such as a scalable video service, a scalable audio service, a scalable audio/video service, a scalable data service, and a stereo 3D video service.
  • the multiplexing apparatus according to the present embodiment can advantageously minimize system supplementary information transmitted as a transport stream of each layer.
  • the multiplexing apparatus shown in Fig. 2 operates as follows.
  • the IOD generator 310 generates IOD data including descriptors that describe object information (OD/BIFS) of a base layer and object information (OD/BIFS) of an enhancement layer.
  • the SL packetizer 340 receives the ES of the base layer, the object information of the base layer generated by the base layer OD/BIFS generator 320, the ES of the enhancement layer, and the object information of the enhancement layer generated by the enhancement layer OD/BIFS generator 330 and generates SL packets by synchronizing the received data. Then, the PES packetizer 370 receives SL packets outputted from the SL packetizer 340 and generates PES packets through PES packetizing.
  • the base layer section generator 350 receives the IOD data generated by the IOD generator 310 and the SL packet of the object information of the base layer and generates a PSI section and a 14496 section.
  • the PMT in the PSI includes a descriptor ASS_Descriptor connecting the SCST.
  • the enhancement layer section generator 360 receives the SL packet of the object information of the enhancement layer and generates a SCST section and a 14496 section.
  • the base layer TS multiplexer 380 generates a base layer TS by multiplexing the PSI section generated by the base layer section generator 350, the 14496 section of the base layer, and the PES packet of the base layer generated by the PES packetizer 370.
  • the enhancement layer multiplexer 390 generates an enhancement layer TS by multiplexing the SCST section generated by the enhancement layer section generator 360, the 14496 section of the enhancement layer, and the PES packet of the enhancement layer generated from the PES packetizer 370.
  • Fig. 3 is a block diagram illustrating a multiplexing apparatus in accordance with another embodiment of the present invention.
  • the multiplexing apparatus according to another embodiment enables a transmitter to provide an SNR scalability service or a temporal scalability service.
  • the multiplexing apparatus is different from the multiplexing apparatus of Fig. 2 in an enhancement layer OD generator 530.
  • the SNR scalability service and the temporal scalability service are provided for a scalable video service. That is, the SNR scalability service and the temporal scalability service are provided to service the scene reproduced in a typical DMB receiver in high quality. That is, while providing a QVGA level quality service through a base layer TS, a further higher quality service, such as a QVGA level quality service, is provided by adding the enhancement layer TS.
  • the multiplexing apparatus outputs an enhancement layer TS without BIFS because BIFS information included in the enhancement layer TS includes the same information in the base layer TS.
  • Table 9 shows a structure of IOD data for providing the SNR scalability service or the temporal scalability service.
  • a multiplexing apparatus can provide a callable high quality video/audio service by providing an enhancement layer audio ES to the SL packetizer 340 of Fig. 2.
  • the multiplexing apparatuses of Figs. 2 and 3 use MPEG-4 object data such as IOD and OD BIFS for a scalable service.
  • a multiplexing apparatus according to further another embodiment of the present invention may use MPEG-2 data for a high quality service. That is, the multiplexing apparatus according to further another embodiment includes a packetizer, a section generator, and a multiplexer.
  • the packetizer receives an element stream of a base layer and an element stream of an enhancement layer and packetizes the received element streams through PES packetization.
  • the section generator generates a PSI section including a descriptor connecting an element stream of a base layer and a SCST.
  • a PMT in a PSI section includes a descriptor or a field connecting the SCST.
  • the section generator generates a scalable contents service table (SCST) section including information about an element stream of an enhancement layer.
  • SCST scalable contents service table
  • the multiplexer generates a base layer transport stream by multiplexing the PES packet of the elementary stream of the base layer and the PSI section and generates an enhancement layer transport stream by multiplexing the packetized element stream of the enhancement layer with the SCST section.
  • Fig. 4 is a block diagram illustrating a demultiplexing apparatus in accordance with an embodiment of the present invention.
  • the de-multiplexing apparatus includes a demultiplexer 410, a section analyzer 420, and a depacketizer 430.
  • the demultiplexer 410 receives a base layer TS and an enhancement layer TS.
  • the demultiplexer 410 separates the base layer TS into a packetized element stream and packetized object information of a base layer, and a 14496 section and a PSI section which include object information of the base layer by demultiplexing the base layer TS.
  • the demultiplexer 410 also separates the enhancement layer TS into a packetized element stream and packetized object information of the enhancement layer and a 14496 section and a SCST section which include object information of the enhancement layer.
  • the section analyzer 420 parses the PSI section.
  • the section analyzer 420 also parses the 14496 section including the object information of the base layer and the 14496 section including the object information of the enhancement layer based on the parsed PSI section. It will be described in later with reference to Figs. 5 and 6.
  • the depacketizer 430 depacketizes the packetized element stream and the packetized object information of the base layer and the packetized element stream and the packetized object information of the enhancement layer based on the parsing result of the section analyzer 420. It will be described in detail with reference to Figs. 5 and 6.
  • Figs. 5 and 6 are diagrams for describing operation of a demultiplexing apparatus in accordance with an embodiment of the present invention.
  • the demultiplexing apparatus receives a base layer TS and an enhancement layer TS and finds a program association table (PAT) of the base layer TS, which is a start point of multiplexing information from the received base layer TS and enhancement layer TS.
  • PAT program association table
  • the demultiplexing apparatus finds a value where a PID become '0' from the received base layer TS and the enhancement layer TS. If the demultiplexing apparatus according to the present embodiment finds a PAT where the PID becomes '0', the demultiplexing apparatus according to the present embodiment parses the base layer TS. That is, the PAT is parsed.
  • the demultiplexing apparatus searches a BIFS in an IOD located at the first position of the parsed PMT and ES_IDs of OD.
  • the demultiplexing apparatus searches a PID connected to the ES_IDs by searching the remaining parts of the IOD of the PMT.
  • the demultiplexing apparatus searches a BIFS stream and an OD stream of the base layer by parsing the 14496.
  • the demultiplexing apparatus searches a base layer audio PES. If the searched PID denotes a basic video data, the demultiplexing apparatus according to the present embodiment searches a base layer video PES. Then, the demultiplexing apparatus according to the present embodiment depacketizes the searched base layer audio PES and the searched base layer video PES using a PES depacketizer and outputs a base layer audio ES and a base layer video ES.
  • the enhancement layer TS is parsed when the demultiplexing apparatus according to the present embodiment searches a descriptor ASS_Descriptor connecting a SCST in the parsed PMT.
  • the demultiplexing apparatus searches a SCST section from a PID. Then, the searched SCST is parsed.
  • a PID connected to ES_ID is searched.
  • the searched PID denotes a 14496 section
  • a BIFS stream and an OD stream of the enhancement layer are searched by parsing the 14496 section.
  • an enhancement layer video PES is searched. Then, the searched enhancement layer video PES is depacketize using a PES depacketizer and an enhancement layer video ES is outputted.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Systems (AREA)

Abstract

La présente invention concerne un appareil et un procédé pour le multiplexage et le démultiplexage basé sur la diffusion multimédia numérique. L'appareil de multiplexage comporte un paquetiseur, un générateur de sections, et un multiplexeur. Le paquetiseur assure la paquetisation de flux d'éléments et d'une information d'objets d'une couche de base et d'une couche d'amélioration. Le générateur de sections génère 14496 sections comprenant l'information d'objets de la couche de base et de la couche d'amélioration, une section SCST comprenant une information de flux d'éléments de la couche d'amélioration, un IOD comprenant des descripteurs pour l'information d'objets de la couche de base et de la couche d'amélioration, et une section PSI comprenant un descripteur reliant le SCST. Le multiplexeur génère des TS de couche de base et de couche d'amélioration par le multiplexage des flux d'éléments paquetisés et de l'information d'objets paquetisée de la couche de base et de la couche d'amélioration, les 14496 sections comprenant l'information d'objets de la couche de base et de la couche d'amélioration, la section PSI, et la section SCST.
PCT/KR2009/006287 2008-12-22 2009-10-29 Appareil et procédé pour le multiplexage et le démultiplexage basé sur la diffusion multimédia numérique WO2010074399A2 (fr)

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CN200980157200.5A CN102326387B (zh) 2008-12-22 2009-10-29 用于基于数字多媒体广播来进行多路复用和解多路复用的设备和方法

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CN103533404B (zh) * 2012-07-04 2016-12-21 扬智电子科技(上海)有限公司 数字广播电视的接收方法
KR102553316B1 (ko) * 2015-03-06 2023-07-10 한국전자통신연구원 레이어드 디비전 멀티플렉싱을 이용한 방송 신호 프레임 생성 장치 및 방송 신호 프레임 생성 방법
KR101638791B1 (ko) * 2015-03-13 2016-07-12 한국디엠비 (주) 고화질 dmb를 위한 계층적 비디오 스트림 다중화 방법, 역다중화 방법

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CN102326387B (zh) 2014-07-09
KR101201206B1 (ko) 2012-11-15

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