WO2015109904A1 - Procédé d'identification de flux de transport multiples reposant sur une interface usb - Google Patents

Procédé d'identification de flux de transport multiples reposant sur une interface usb Download PDF

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Publication number
WO2015109904A1
WO2015109904A1 PCT/CN2014/094034 CN2014094034W WO2015109904A1 WO 2015109904 A1 WO2015109904 A1 WO 2015109904A1 CN 2014094034 W CN2014094034 W CN 2014094034W WO 2015109904 A1 WO2015109904 A1 WO 2015109904A1
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WO
WIPO (PCT)
Prior art keywords
transport stream
usb
television receiver
digital television
packet
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Application number
PCT/CN2014/094034
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English (en)
Chinese (zh)
Inventor
李艳荣
林铠鹏
向柄宇
李�诚
Original Assignee
深圳国微技术有限公司
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Application filed by 深圳国微技术有限公司 filed Critical 深圳国微技术有限公司
Publication of WO2015109904A1 publication Critical patent/WO2015109904A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
    • H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/42615—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific demultiplexing arrangements
    • 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
    • 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
    • H04N21/4347—Demultiplexing of several video streams

Definitions

  • the present invention relates to the field of digital television, and more particularly to a method for identifying a multi-path transport stream based on a USB interface.
  • a digital television receiver (host) and a conditional receiving device (CAM, Conditional Access Module) is separated, the host completes the signal receiving and decoding work, the CAM completes the signal descrambling and decryption work, and the host uses a standard interface between the host and the CAM, and the access between the host and the CAM can be completed by using the standard interface. It is not necessary to consider the specific implementation details.
  • CAM is more than just a single conditional access device. More and more applications are being expanded on CAM, and users will have more personalized needs, such as watching another program while recording another program.
  • simultaneous processing of multiple streams TS, Transport
  • Stream can not meet the user to watch while recording (such as watching TS A's program, while recording TS
  • the demand for B's program The host supporting multiple TS processing functions in the market integrates two or more public interfaces, and realizes the functions of simultaneously processing multiple TSs based on multiple CAMs. The implementation process is complicated, the cost is high, the products are not compact, and it is difficult to promote.
  • the main object of the present invention is to provide a method for identifying a multi-path transmission stream based on a USB interface, which aims to solve the problem that a digital television receiver and a conditional receiving device cannot recognize a multi-path transmission stream, and only one conditional receiving device cannot simultaneously process multiple channels.
  • the problem with the transport stream is to provide a method for identifying a multi-path transmission stream based on a USB interface, which aims to solve the problem that a digital television receiver and a conditional receiving device cannot recognize a multi-path transmission stream, and only one conditional receiving device cannot simultaneously process multiple channels. The problem with the transport stream.
  • the present invention provides a method for identifying a multi-path transport stream based on a USB interface, including the following steps:
  • the digital television receiver identifies and multiplexes the multiple transport streams into one transport stream
  • the digital television receiver encapsulates the multiplexed one-way transport stream into a USB packet, and sends the same to the conditional receiving device through a pair of USB transport stream endpoints of the USB interface;
  • the conditional receiving device unpacks and descrambles the USB packet sent by the digital television receiver, and then returns the packet to the digital television receiver after being encapsulated;
  • the digital television receiver unpacks, demultiplexes, and decodes the USB packet after receiving the USB packet returned by the conditional receiving device through the receiving end of the pair of USB transport stream endpoints of the USB interface.
  • the method further comprises the following steps:
  • the digital television receiver filters the PID of the transport stream.
  • the specific steps of the digital television receiver to separately identify the multiplexed transport stream are:
  • the digital television receiver modifies the sync bytes of the transport stream packet header in the multiplex transport stream to different transport stream numbers for identification.
  • the specific steps of the digital television receiver to separately identify the multiplexed transport stream are:
  • the digital television receiver adds a transport stream number to identify the sync byte of the transport stream packet header in the multiplex transport stream.
  • one USB packet contains an integer number of transport stream packets.
  • the method for identifying a multiplexed transport stream based on a USB interface further includes the following steps:
  • the command is transmitted through a pair of USB command transceiving endpoints, and the commands related to the transport stream are distinguished by adding a transport stream number corresponding to the transport stream on the command.
  • a method for identifying a multi-path transport stream based on a USB interface further comprising the following steps:
  • the digital television receiver packages the multiple transmission streams into a plurality of USB packets respectively;
  • the digital television receiver transmits the plurality of USB packets to the same conditional receiving device through the sending end points of the plurality of pairs of USB transport stream endpoints of the USB interface;
  • the conditional receiving device unpacks and descrambles the plurality of USB packets sent by the digital television receiver, and then returns the packet to the digital television receiver after being encapsulated;
  • the receiving end of the plurality of pairs of USB transport stream endpoints of the digital television receiver respectively unpacks and decodes the USB packet.
  • the method further comprises the following steps:
  • the digital television receiver filters the PID of the transport stream.
  • the method for identifying a multiplexed transport stream based on a USB interface further includes the following steps:
  • the commands related to the transport stream are distinguished by adding an endpoint number to the command.
  • the method for identifying a multiplexed transport stream based on a USB interface further includes the following steps:
  • the command interaction between the digital television receiver and the conditional receiving device if the command is transmitted through a plurality of pairs of USB command transceiving endpoints, the command related to the transport stream is transmitted through the command transmitting and receiving endpoint corresponding to the transport stream, and the command independent of the transport stream, Then, a pair of command sending and receiving endpoints corresponding to a certain transport stream are designated for transmission.
  • the digital television receiver separately identifies and multiplexes the multi-path transport streams into one transport stream; the digital television receiver encapsulates the multiplexed one-way transport stream into a USB package. Transmitting a pair of USB transport stream endpoints to the conditional receiving device through the USB interface; the conditional receiving device unpacks and descrambles the USB packet sent by the digital television receiver, and then transmits the packet back to the digital television receiver; The television receiver unpacks, demultiplexes, and decodes the USB packet after receiving the USB packet returned by the conditional receiving device through the receiving end of the pair of USB transport stream endpoints of the USB interface.
  • the beneficial effect of the realization is: in the machine card separation system, the identification and processing of the multi-path transmission stream is realized through the USB interface, and the user can realize the cross-TS "viewing and recording” and “painting” by using only one conditional receiving device. "Drawing” and other functions; and based on the standard USB protocol, easy to develop and promote.
  • FIG. 1 is a schematic flowchart of a first embodiment of a method for identifying a multi-path transport stream based on a USB interface according to the present invention
  • FIG. 2 is a diagram showing an example of TS transmission in the method for identifying a multi-path transport stream based on a USB interface shown in FIG. 1;
  • FIG. 3 is a schematic flowchart of a second embodiment of a method for identifying a multi-path transport stream based on a USB interface according to the present invention
  • FIG. 4 is a diagram showing an example of TS transmission in the method of identifying a multiplexed transport stream based on a USB interface shown in FIG.
  • the embodiment provides a method for identifying a multiplexed transport stream based on a USB interface.
  • the method for identifying a multiplexed transport stream based on a USB interface includes the following steps:
  • the digital television receiver separately identifies and multiplexes the multiple transport streams into one transport stream;
  • Digital TV receiver is responsible for each TS (Transport) Stream, multiplex stream) for identification, TS packet transmission, each packet length is 188 bytes, you can fill in many types of data in the TS, such as video, audio, custom information.
  • the structure of the TS packet is that the TS header is 4 bytes (the first byte is the sync byte 0x47), and the load is 184 bytes (the 184 bytes are not necessarily all valid data, and some may be padded) data).
  • the TS header includes synchronization information, packet information, and the like, and the payload is the transmitted data, and the transmitted data may be an audio stream or a video stream.
  • the digital television receiver separately identifies the multiple transmission streams to facilitate subsequent identification of the TS, and the digital television receiver multiplexes the multiple TSs into one TS for transmission.
  • the digital television receiver encapsulates the multiplexed one-way transport stream into a USB packet, and sends the same to the conditional receiving device through a pair of USB transport stream endpoints of the USB interface;
  • USB endpoint of a pair of USB transport stream endpoints (Conditional Access) Module, conditional receiving device), in USB communication
  • the USB endpoint is the most basic form of USB data transmission.
  • a USB endpoint can only transmit data in one direction, for example, from the host to the CAM (called the sending endpoint) or from the CAM to the host. (called the receiving endpoint).
  • the purpose of providing a pair of USB endpoints (i.e., transmitting and receiving both endpoints) between the digital television receiver and the conditional access device is to achieve bidirectional transmission between the digital television receiver and the conditional access device.
  • the conditional receiving device unpacks and descrambles the USB packet sent by the digital television receiver, and then returns the packet to the digital television receiver after being encapsulated;
  • the digital television receiver receives, after the receiving end of the pair of USB transport stream endpoints of the USB interface, the USB packet that is sent back by the conditional receiving device, and then unpacks, demultiplexes, and decodes the USB packet.
  • the digital television receiver separately identifies and multiplexes the multi-path transport streams into one transport stream; the digital television receiver encapsulates the multiplexed one-way transport stream into a USB
  • the packet is sent to the conditional receiving device by the sending end of the pair of USB transport stream endpoints through the USB interface; the conditional receiving device unpacks and descrambles the USB packet sent by the digital television receiver, and then transmits the packet back to the digital television receiver after being encapsulated;
  • the digital television receiver unpacks, demultiplexes, and decodes the USB packet after receiving the USB packet returned by the conditional receiving device through the receiving end of the pair of USB transport stream endpoints of the USB interface.
  • the beneficial effect of the realization is: in the machine card separation system, the identification and processing of the multi-path transmission stream is realized through the USB interface, and the user can realize the cross-TS "viewing and recording” and “painting” by using only one conditional receiving device. "Drawing” and other functions; and based on the standard USB protocol, easy to develop and promote.
  • the method further includes the following steps:
  • the digital television receiver filters the PID of the transport stream.
  • the digital television receiver filters the PID of the TS, where the PID (Packet).
  • PID Packet
  • the identifier packet identifier is an important parameter for identifying the TS packet and is used to identify the data carried by the TS packet.
  • the basic code stream of each type of service (video, audio, data) is given a different identification number PID, and the digital television receiver can use the PID to determine where a TS packet belongs by decoding.
  • the basic code stream of a type of service The digital TV receiver pre-screens the TS's PID to save USB interface bandwidth.
  • the digital television receiver modifies the sync bytes of the transport stream packet header in the multiplex transport stream to different transport stream numbers for identification.
  • the digital television receiver in this embodiment is responsible for identifying each transport stream, and the digital television receiver modifies the sync byte (0x47) of the TS packet header of each transport stream in the TS to a different transport stream number.
  • the identifier is specifically: the synchronization byte (0x47) of the original TS is modified as the TS code.
  • the modified TS is defined as Local.
  • LTS_ID a encoding of the TS
  • LTS_ID the synchronization byte (0x47)
  • LTS_ID of the second Local TS can be set to 0x48, and so on.
  • LTS_ID of the TS is incremented by one.
  • the LTS_ID can also be set according to other rules.
  • the LTS_IDs in different Local TSs are different, that is, each way Local
  • the TS sets a unique LTS_ID to identify the transport stream.
  • the modified Local is modified.
  • the TS does not change the length of the original TS packet, that is, each packet length of the TS packet is still 188 bytes.
  • the specific steps of the digital television receiver for separately identifying the multiple transport streams may also be:
  • the digital television receiver adds a transport stream number to identify the sync byte of the transport stream packet header in the multiplex transport stream.
  • the digital television receiver in this embodiment is responsible for encoding each transport stream, or adding a byte to a new transport stream in the TS packet of each transport stream without modifying the sync byte (0x47).
  • the number is used for identification. Specifically, a byte is added in front of the synchronization byte (0x47) of the original TS packet, and one byte can be a letter or a symbol, and the data of the original TS packet does not change. After adding one byte, the TS packet length is increased by 1 byte over the length of the original TS packet.
  • the transport stream encoding of the first TS stream is set to 1
  • the transport stream encoding of the second TS stream can be set to 2, and so on, for each additional transport stream, the basis of the transport stream number of the previous transport stream. Add 1 to the top, of course, you can also set the transport stream according to other rules.
  • the transport stream numbers in the same USB packet are different, that is, each transport stream packet is set with a unique transport stream number. logo.
  • the TS packet with the newly added transport stream number increases the length of the packet, that is, one byte is added on the original basis, and the packet length of the TS packet becomes 189 bytes.
  • one USB packet contains an integer number of transport stream packets.
  • USB packet Data integrity must be ensured when the TS package is transmitted.
  • the digital TV receiver performs USB packet, it is necessary to ensure that each USB packet contains a complete TS packet, that is, the original TS is implemented by using the USB packet. Synchronization function of the sync byte (0x47). If the TS packet packaged by the digital TV receiver is not an integer multiple of the USB packet, for example, 2.5 times, the device cannot be synchronized when receiving, which may result in data loss.
  • the method for identifying a multiplexed transport stream based on a USB interface further includes the following steps:
  • the command is transmitted through a pair of USB command transceiving endpoints, and the commands related to the transport stream are distinguished by adding a transport stream number corresponding to the transport stream on the command.
  • the entire process of transmitting the TS of the digital television receiver and the conditional receiving device on the USB interface is as follows;
  • the digital television receiver includes a multi-stream processing module and a command module, wherein the multi-stream processing module includes a PID screening, a TS multiplexing, and a USB sealing/unpacking function.
  • the conditional receiving device comprises a multi-stream processing module and a command module, wherein the multi-stream processing module comprises a USB sealing/unpacking and descrambling function.
  • DVB Digital Broadcasting System
  • DVB-S is a digital satellite live broadcast system
  • DVB-C is a digital cable broadcast power system
  • DVB-T is a digital terrestrial broadcast system.
  • the digital television receiver identifies multiple different TSs, multiplexes them into one TS, and then encapsulates the multiplexed TS into a USB package, and sends the USB packet through the sending endpoint in the USB interface of the USB interface.
  • the conditional receiving device unpacks and descrambles and encapsulates the USB packet, and then receives the USB packet to the digital television receiver through the receiving endpoint in the pair of USB transport stream endpoints of the USB interface, and the digital television receiver receives the back After the USB packet is transmitted, the USB packet is unpacked, demultiplexed, and decoded.
  • the digital television receiver transmits different TSs through the transceiver endpoints of a pair of USB transport stream endpoints. If the interface bandwidth is not sufficient, the digital television receiver can filter the PID of the TS and only transmit the necessary PID to the CAM.
  • the input mode of this embodiment is not limited to RF IN (RF input signal) and IP (network TV signal), can also be storage media input or wireless transmission, etc.
  • the input content format is not limited to TS, but also can be MPEG4 and other video formats.
  • the method for identifying a multiplexed transport stream based on a USB interface includes the following steps:
  • the S210 and the digital television receiver respectively package the multiple transmission streams into a plurality of USB packages
  • the digital television receiver separately packs the TSs of each channel, and how many TS packets are packaged into a number of USB packets.
  • the digital television receiver sends the plurality of USB packets to the same conditional receiving device through the sending end points of the plurality of pairs of USB transport stream endpoints of the USB interface;
  • the digital television receiver sends the packaged first USB packet to the same conditional receiving device through the corresponding transmitting terminal of the pair of USB transport stream endpoints, wherein each USB packet corresponds to a pair of USB transport stream endpoints respectively. Send and receive endpoints.
  • S230 The conditional receiving device unpacks and descrambles the plurality of USB packets sent by the digital television receiver, and then returns the packet to the digital television receiver after being encapsulated;
  • the conditional receiving device After the conditional receiving device receives the plurality of USB packets sent by the digital television receiver, after unpacking the plurality of USB packets, the TS is De-scrambling is performed, and the descrambled TS is re-packed and transmitted back to the television receiver.
  • the S240 and the digital television receiver respectively perform receiving and decoding operations on the USB packet after receiving the plurality of USB packets returned by the conditional receiving device through the receiving end of the pair of USB transport stream endpoints of the USB interface.
  • Each USB packet returned is received by the receiving endpoint of the corresponding USB transport stream endpoint of the digital television receiver, and finally unpacked and decoded.
  • the method for recognizing a multi-channel transmission stream based on a USB interface the digital television receiver separately packages the multiple transmission streams into a plurality of USB packets; the digital television receiver passes the plurality of USB packets through the USB interface of the plurality of pairs of USB The transmitting end of the transport stream endpoint is respectively sent to the same conditional receiving device; the conditional receiving device unpacks and descrambles the plurality of USB packets sent by the digital television receiver, and then transmits the packet back to the digital television receiver; the digital television receiver The receiving end of the pair of USB transport stream endpoints through the USB interface respectively receives the USB packets returned by the conditional receiving device, and then unpacks and decodes the USB packet.
  • the beneficial effect of the realization is that the identification and processing of the multi-path transmission stream is realized through the USB interface in the card separation system, and the user can realize the “viewing and recording” and “picture-in-picture” across the TS by using only one conditional receiving device. And other functions; and the embodiment is based on the standard USB protocol, and has the advantages of convenient development and easy promotion.
  • the method further includes the following steps:
  • the digital television receiver filters the PID of the transport stream.
  • the digital television receiver filters the PID of the TS header, where the PID (Packet).
  • PID Packet
  • the identifier packet identifier is an important parameter for identifying the TS packet and is used to identify the data carried by the TS packet.
  • the basic code stream of each type of service (video, audio, data) is given a different identification number PID, and the digital television receiver can use the PID to determine where a TS packet belongs by decoding.
  • the basic code stream of a type of service The digital TV receiver pre-screens the TS's PID to save USB interface bandwidth.
  • the method for identifying a multiplexed transport stream based on a USB interface further includes the following steps:
  • the commands related to the transport stream are distinguished by adding an endpoint number to the command.
  • the command transmission in this embodiment can be transmitted only through a pair of USB command transceiving endpoints, and the TS-related commands are added with an endpoint number on the original command to distinguish.
  • the method for identifying a multiplexed transport stream based on a USB interface further includes the following steps:
  • the command interaction between the digital television receiver and the conditional receiving device if the command is transmitted through a plurality of pairs of USB command transceiving endpoints, the command related to the transport stream is transmitted through the command transmitting and receiving endpoint corresponding to the transport stream, and the command independent of the transport stream, Then, a pair of USB command sending and receiving endpoints corresponding to a certain transport stream are designated for transmission.
  • the command transmission in this embodiment may also be that each TS has a pair of corresponding USB command transceiving endpoints, and the TS-related commands are transmitted on the corresponding USB command transceiving endpoint; the commands not related to the TS stream are specified in a certain path.
  • the TS (such as the first TS or the second TS) transmits on the corresponding USB command transceiver end point.
  • the entire process of transmitting the TS of the digital television receiver and the conditional receiving device on the USB interface is as follows;
  • the digital television receiver separately encapsulates multiple different TSs into multiple USB packets, and sends multiple USB packets to the same conditional receiving device through the sending endpoints of the multiple pairs of USB transport stream endpoints of the USB interface, and the conditional receiving device pairs USB
  • the packet is unpacked and descrambled and encapsulated, and then the plurality of USB packets are received by the corresponding receiving endpoints in the pair of USB transport stream endpoints of the USB interface, and the digital television receiver receives the returned multiple USB packets. Unpack and decode the USB package.
  • the digital television receiver transmits different TSs through the transceiver terminals of multiple pairs of USB transport stream endpoints. If the interface bandwidth is not sufficient, the digital television receiver can filter the PID of the TS and only transmit the necessary PID to the CAM.

Abstract

La présente invention concerne un procédé d'identification de flux de transport (TS) multiples reposant sur une interface USB, comprenant les étapes suivantes : un récepteur de télévision numérique identifie des TS multiples respectivement et les multiplexe en un TS ; le récepteur de télévision numérique encapsule le TS dans un paquet USB et le transmet à un module d'accès conditionnel (CAM) par le biais d'un point terminal de transmission d'une paire de points terminaux USB sur l'interface USB ; le CAM décapsule et désembrouille le paquet USB transmis par le récepteur de télévision numérique, et le retransmet en retour vers le récepteur de télévision numérique après l'encapsulation ; et le récepteur de télévision numérique reçoit le paquet USB renvoyé par le biais d'un point terminal de réception de la paire de points terminaux USB sur l'interface USB, décapsule, démultiplexe et décode le paquet USB. La présente invention met en œuvre une identification et un traitement de TS multiples par le biais d'une interface USB dans un système de séparation carte-machine, de sorte que l'utilisateur puisse mettre en œuvre des fonctions inter-TS « d'enregistrement lors du visionnage » et « d'incrustation d'image » simplement à l'aide d'un CAM. En outre, la présente invention est basée sur un protocole USB standard, facilitant ainsi le développement et la promotion.
PCT/CN2014/094034 2014-01-22 2014-12-17 Procédé d'identification de flux de transport multiples reposant sur une interface usb WO2015109904A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410030693.9 2014-01-22
CN201410030693.9A CN103763579A (zh) 2014-01-22 2014-01-22 基于usb接口识别多路传输流的方法

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