CN103647981B - Method for realizing multiplexing of command and transport stream in DVB-CI interface - Google Patents
Method for realizing multiplexing of command and transport stream in DVB-CI interface Download PDFInfo
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- CN103647981B CN103647981B CN201310720051.7A CN201310720051A CN103647981B CN 103647981 B CN103647981 B CN 103647981B CN 201310720051 A CN201310720051 A CN 201310720051A CN 103647981 B CN103647981 B CN 103647981B
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Abstract
The invention discloses a method for realizing multiplexing of a command and a transport stream in a DVB-CI interface. The method comprises the steps of: packaging command data in a user-defined segmentation format of a link layer of a command interface of the DVB-CI interface according to a transport stream data packet format in an ISO/IEC 13818-1 standard, wherein values of synchronous bytes in the packaged command data packet are not equal to values of synchronous bytes in the transport stream data packet; performing time division multiplexing transmission on the data packet of the transport stream and the data packet of the command data by the data sending end of the DVB-CI interface by utilizing a time division multiplexer; analyzing each received data packet by the data receiving end of the DVB-CI interface by utilizing the time division demultiplexer, and distinguishing the transport stream data packet from the command data packet based on the synchronous bytes of the data packets. Only a rapid bidirectional channel is necessary when one time division multiplexer is used for processing data bandwidth distribution, so that requirements on driving of a transmission interface are simple, and multiple physic interface also can be selected to realize the DVB-CI interface; in addition, the communication real-time performance of the DVB-CI interface can be adjusted based on the practical need.
Description
Technical field
The present invention relates to the communication technology between the machine card of DTV, realized in DVB-CI interfaces more particularly, to one kind
Order and the method for transmission flow multiplex.
Background technology
At present, DVB-CI standards are that an interface standard is defined between main frame and module.This standard implementation is based on physics
Pcmcia interface, defines two logic interfacings on a physics pcmcia interface：One interface（Or passage）For transmitting
Stream（Transport Stream, TS, are also called code stream）；Another interface（Or passage）Transmitted for ordering（Main frame and transmission
Instruction between module）.Main frame as shown in Figure 1（Such as digital television receiving apparatus）With card module（Such as, CAM cards）Between adopt
It is connected with DVB-CI interfaces, main frame sends the code stream and command information of scrambling respectively by respective channel transfer to card module,
And it is also to be passed by respective passage respectively that card module solves scrambled transmission streams and the command information to main frame generation response main frame
It is defeated.
In general, DVB-CI interfaces are realized based on being pcmcia interface, but are had on the physical interface of PCMCIA
68 pins, physically connect complicated.
As the interface popularization of USB2.0 and transmission speed are improved, two logic interfacings can be realized by different end points.
One USB end points can only transmit data to a direction, and exit point is that from main frame to device orientation, input endpoint is from setting
Standby to arrive main frame direction, end points is seen as a unidirectional pipeline.But USB2.0 is physically semiduplex differential signal to be passed
Defeated, two the four of logic interfacing end points are that timesharing uses a physical channel, are accounted for by usb protocol distribution port by host driven
Use the time.Order is higher than code stream requirement of real time, but code stream is also in real time have time requirement, and otherwise audio frequency and video are not smooth.It is right
The host driven of USB2.0 needs particular/special requirement.
Therefore, if DVB-CI interfaces can be realized in USB interface, DVB-CI interface complexities and difficulty are realized into reduction
Degree.However, how to realize this technical barrier, continue one of technical barrier of solution at present as those skilled in the art.
The content of the invention
To overcome the defect of prior art, the present invention to propose that one kind realizes order and transmission flow multiplex in DVB-CI interfaces
Method, to solve to be realized using pcmcia interface at present to have physics baroque technical problem during DVB-CI interfaces.
The present invention adopts the following technical scheme that realization：A kind of side that order and transmission flow multiplex are realized in DVB-CI interfaces
Method, it includes step：
The order data of the self-defined zoned format of the link layer of command interface in DVB-CI interfaces is pressed into ISO/IEC
Transport stream data packet form is packaged in 13818-1 standards, and the value of sync byte and biography in the command packet being packaged into
The value of sync byte is unequal in defeated stream packets；
The data sending terminal of DVB-CI interfaces utilizes adaptive multiplexer by the order of the packet of transport stream and zoned format
The packet time multiplexed transmission of data；
Each packet that the data receiver of DVB-CI interfaces is received using time-division demultiplexer parsing, according to data
The sync byte of bag distinguishes the command packet of transport stream data packet and zoned format.
Wherein, it is described to realize that order also includes step with the method for transmission flow multiplex in DVB-CI interfaces：Configuring time division
The code stream interval bag parameter of multiplexer, adaptive multiplexer is spaced bag parameter by the packet and zoned format of transport stream according to code stream
Command packet carry out interval transmission.
Wherein, when code stream interval bag parameter is configured to zero, adaptive multiplexer temporarily interrupts transmission packet, it would be desirable to pass
The command packet of defeated zoned format is inserted into the transmit queue of transport stream data packet.
Wherein, it is described to realize that order also includes step with the method for transmission flow multiplex in DVB-CI interfaces：According to DVB-
The code stream interval bag parameter of the requirement of real-time dynamic configuration adaptive multiplexer of CI interface communications.
Wherein, if sync byte is 0x47 in packet, the packet is transport stream data packet, is otherwise command number
According to bag.
Wherein, an order data of DVB-CI interfaces link layer is packaged into an order segments under normal circumstances
According to if a command data length is very long（More than 65524 bytes）, multiple order segment datas will be packaged into.Order point
Segment data presses standard ISO/IEC 13818-1 mode encapsulated delivery streams（TS）Bag form.
Wherein, it is described to realize that order also includes step with the method for transmission flow multiplex in DVB-CI interfaces：When decompose
After multiplexer is parsed and is judged as command packet, the correctness of order segment data in check command packet, then from order
The order data of link layer is extracted in segment data.
Wherein, the self-defined zoned format includes：The table_id of 8 bit；The piecemeal synchronizing indication position of 1bit
Section_syntax_indicator, should put ' 1 '；The order block length command_section_length of 16bit, shows
The byte number of this segmentation after command_section_length fields；The piecemeal numbering section_number of 16bit,
The section_number of the segmentation of order data first should be 0x00, and it will increase each additional segments with order data
Plus 1；The bit fields of last_section_number 16, represent the number of last segmentation of order data；data_byte
Data are the fragment or data cell of link layer order data；The CRC_32 fields of 32bit, are included in complete order point for the treatment of
The value that CRC is output as zero CRC is calculated after section.
Compared with prior art, the present invention has the advantages that：
The present invention presses ISO/IEC 13818-1 standards, and the order data of zoned format is packaged into transport stream format, utilizes
Adaptive multiplexer will be transmitted after the order data and transmission flow multiplex of zoned format in a passage, and be demultiplexed by the time-division
The order data of transport stream and zoned format is determined by the value of sync byte sync_byte in each packet with device, because
This, the present invention only need to provide quick duplex channel by an adaptive multiplexer processing data bandwidth allocation, not only to passing
Defeated interface driver requirement is simple, it is also an option that in various physical interfaces（Such as USB2.0 interfaces, USB3.0 interfaces,
IEEE1394 etc.）On realize DVB-CI interfaces.Also, the present invention is spaced bag parameter by setting the code stream of adaptive multiplexer, just
Can realize that the band width in physical to transport stream and order data in a bi-directional transfer path carries out reasonable distribution, such that it is able to
Take into account the real-time of transport stream and order data.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of existing DVB-CI interfaces；
Fig. 2 is the encapsulating structure schematic diagram of the packet of transport stream；
Fig. 3 is the schematic diagram of order fragment data structure in DVB-CI interfaces；
Fig. 4 is command packet segmental structure schematic diagram in DVB-CI interfaces；
Fig. 5 is the schematic flow sheet of one embodiment of the invention；
Fig. 6 is that transport stream and order are carried out into time-multiplexed schematic diagram using time division multiplex；
Fig. 7 is the schematic diagram that decomposition multiplex distinguishes transport stream and order when utilizing；
Fig. 8 is to realize structural representation of the invention in the DVB-CI interfaces of television reception terminal.
Specific embodiment
In order to make it easy to understand, first to ISO/IEC13818-1 encapsulated delivery streams（TS）The encapsulating structure of packet is retouched
State.As shown in Fig. 2 each TS packet is 188 bytes, it is divided into head（Header）And pay(useful) load.Wherein, head includes：
The sync byte sync_byte, sync_byte of 8bit are fixed as 0x47, represent that head is unwrapped in a transmission；The transmission of 1bit is wrong
Miss flag bit transport_error_indicator；The pay(useful) load starting indicating bit payload_unit_ of 1bit
start_indicator；The transmission priority bit transport_priority of 1bit；The PID of 13bit, PID indicate this
The type of the effective load data of individual bag；The transmission control extension position transport_scrambling_control of 2bit；
The adaptation field control bit adaptation_field_control of 2bit；The continuous counter continuity_ of 4bit
counter ；Remaining byte is adaptation field adaptation_field.
With reference to shown in Fig. 3 and Fig. 4, the command number of the self-defined zoned format of the link layer of command interface in DVB-CI interfaces
It is segmented according to multiple orders are packaged into（Or data block）, than the data block of a link layer order is divided into four as shown in Figure 4
Order segment data, each order segment data（Or data block）The value of middle section_number is respectively 0,1,2,3,
The value of last_section_number is 3.
Wherein, such as Fig. 3, custom command fragment data structure includes：The table_id of 8 bit（Order table id）, its value
The order table belonging to this segmentation is recognized, table_id chooses a value according to actual needs, and span is 0x40 ~ 0xFE；
The piecemeal synchronizing indication position section_syntax_indicator of 1bit, should put ' 1 '；The order block length of 16bit
Command_section_length, it shows the byte number of this segmentation after command_section_length fields,
Comprising CRC；The piecemeal numbering section_number of 16bit, the section_number of the segmentation of command link data first should
Should be 0x00, it will increase by 1 each additional segments with order data；The bit fields of last_section_number 16,
Represent the number of last segmentation of order data in linking layer；Data_byte data are order data fragment in link layer
Or data cell；The CRC_32 of 32bit, the value that CRC is output as zero CRC is calculated after being included in complete order segmentation for the treatment of.
The length of command_section_length fields 16, represents up to 65535 words of order segment data
Section.Subtract other bytes of expense 11（Reserve bytes, number-of-fragments, maximum segment numbering, CRC byte）, link layer can be encapsulated
Data cell do not surpass 65524 bytes.If an order data（The data cell of link layer）Length is very long（More than 65524
Byte）, multiple order segment datas will be packaged into.
With reference to shown in Fig. 5, a preferred embodiment of the invention includes step is implemented as described below：
The order data of the zoned format of the link layer of command interface in DVB-CI interfaces is pressed ISO/ by step S1, the present invention
Transport stream data packet form is packaged in IEC 13818-1 standards, as shown in Figure 3.Sync byte in order segment data packet
With non-zero x47 values（For example：0x57,0x67,0x77,0x37,0x48 or 0x49 etc.）, it is easy to recognition command packet；The value of PID
Value be 0x2 or other.
The data sending terminal of step S2, DVB-CI interface, the code stream interval bag parameter of configuring time division multiplexer, using the time-division
Multiplexer is by the packet of transport stream（Also referred to as transport stream data packet）With the packet of order data（Also referred to as command number
According to bag）Interval transmission is carried out according to code stream interval bag parameter.
The information content of transport stream is very big, the information content very little of order, but the real-time of order is higher than transport stream.Time-division answers
There is a code stream to be spaced bag parameter with device to configure, when code stream interval bag parameter is configured to zero, temporarily interrupt transmission packet, and
The command packet of transmission will be needed to be inserted into the transmit queue of transport stream data packet.When code stream interval, bag parameter is configured to 1
When, transport stream data packet and command packet alternate transport.When code stream interval bag parameter is configured to 2,2 transport streams are often transmitted
Packet, then 1 command packet is transmitted, circulation is carried out, such as Fig. 6.When the Configuration Values of code stream interval bag parameter are bigger, command number
The time is more long the need for according to bag transmission, and real-time is poorer.Therefore, it can configure reasonable code stream interval bag ginseng according to the actual requirements
Number.
The data receiver of step S3, DVB-CI interface is using time-division demultiplexer according to sync byte in each packet
Sync_byte, distinguishes the command packet of transport stream data packet and zoned format.
After the order data of zoned format is packaged into the data packet format of transport stream, order data can with transmission flow data
Transmitted by a passage or interface with mixing, receive a side of packet when packet is parsed, it is only necessary to which detection is every
Sync byte sync_byte in individual packet.If sync byte sync_byte is 0x47, show current data packet to pass
Defeated stream packets, otherwise for zoned format order data packet.Therefore, time-division demultiplexer is according in each packet
Sync byte sync_byte, you can accurately distribute transport stream data packet and command packet, as shown in Figure 7.
For the command packet of zoned format（One order segment information includes an order data under normal circumstances
Bag）, the correctness of check command segment data.Then, the order data of link layer is extracted from order segment data.
As shown in figure 8, being transmitted after transport stream and order multiplexing are realized in the DVB-CI interfaces of television reception terminal.This reality
The television reception terminal for applying example uses separation between machine and card, so-called separation between machine and card to refer to the common segment in digital TV terminal
（Hardware）It is independent, " machine " is made, and the CA of various regions radio and TV operator（Condition receives system）And EPG（Electronic programming refers to
South）, middleware, many value-added service parts such as data broadcasting make " card ".Main frame from demodulation module receive code stream information by
TS circulation roads are transmitted to card module, after card module descrambles to code stream as needed, then by TS circulation road hero of biography machines.Main frame receives solution
Rear code stream is disturbed, code stream is transmitted to demultiplexing module.Command information is transmitted to card module by main frame, and card module treatment command information is returned
Return the corresponding command information.Command information is divided into application layer, transaction layer, transport layer, link layer, physics in the standards of DVB-CI 1.0
Layer.All it is to be realized by software on link layer, has a buffer size before the driving communication of pcmcia interface（BN）Consult
Process.Buffer size（BN the size of link layer data units LPDU) is determined.Each LPDU is by 2 heads of byte, TPDU
Block composition, total size is without departing from the buffer size consulted.If buffer size（BN）2048 bytes are defined as, are ordered
The size of the data cell LPDU of the link layer of information is made to be no more than 2048 bytes.The physical layer of command information and bit stream
Physical layer is realized by pcmcia interface.
First the link layer data and transport stream of command information are multiplexed in adaptive multiplexer, then interface（Such as,
USB2.0 or USB3.0 interfaces）Only it is responsible for quick transmission.
Therefore, as long as the enough fast duplex channel of transmission speed just meets requirement between main frame and card module, it is indifferent to physics
Upper full duplex or half-duplex.The driving requirement communicated between main frame and card module is very simple, there is provided an input and an output
Just can be with.
To sum up, the present invention presses ISO/IEC 13818-1 standards, and the zoned format of order data is packaged into transmitting stream（TS）
Bag form, will be transmitted after order data and transmission flow multiplex using adaptive multiplexer in a passage, and by when decompose
Multiplexer determines transport stream and order data by the value of sync byte sync_byte in each packet, therefore, the present invention
By an adaptive multiplexer processing data bandwidth allocation, quick duplex channel only need to be provided, not only coffret is driven
It is dynamic to require simply, it is also an option that in various physical interfaces（Such as USB2.0 interfaces, USB3.0 interfaces, IEEE1394 etc.）Upper reality
Existing DVB-CI interfaces.Also, the present invention is spaced bag parameter by setting the code stream of adaptive multiplexer, it is possible to realize double at one
Reasonable distribution is carried out to the band width in physical in transmission channel to transport stream and order data, such that it is able to take into account transport stream and order
The real-time of data.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. it is a kind of to realize ordering the method with transmission flow multiplex in DVB-CI interfaces, it is characterised in that including step：
The order data of the self-defined zoned format of the link layer of command interface in DVB-CI interfaces is pressed into ISO/IEC 13818-1
Transport stream data packet form is packaged in standard, and the value of sync byte and transmission flow data in the command packet being packaged into
The value of sync byte is unequal in bag；
The data sending terminal of DVB-CI interfaces using adaptive multiplexer by the packet of the packet of transport stream and order data when
Divide multiplexing transmission；
Each packet that the data receiver of DVB-CI interfaces is received using time-division demultiplexer parsing, according to packet
Sync byte distinguishes transport stream data packet and command packet；
Also include step：The code stream interval bag parameter of configuring time division multiplexer, adaptive multiplexer will according to code stream interval bag parameter
The packet and command packet of transport stream carry out interval transmission, and the value of code stream interval bag parameter is bigger, command packet transmission
The time of needs is more long.
2. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 1, it is characterised in that when
When code stream interval bag parameter is configured to zero, adaptive multiplexer temporarily interrupts transmission packet, it would be desirable to the command packet of transmission
It is inserted into the transmit queue of transport stream data packet.
3. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 1, it is characterised in that also
Including step：The code stream interval bag parameter of the requirement of real-time dynamic configuration adaptive multiplexer according to DVB-CI interface communications.
4. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 1, it is characterised in that such as
Sync byte is 0x47 in fruit packet, then the packet is transport stream data packet, is otherwise command packet.
5. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 1, it is characterised in that institute
It is the data block for order data being packaged into self-defined zoned format to state self-defined zoned format.
6. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 1, it is characterised in that
The order data of the self-defined zoned format of the link layer of command interface is packaged into one under normal circumstances in DVB-CI interfaces
Order segment data；If a command data length is more than 65524 bytes, multiple order segment datas will be packaged into,
Each order segment data is packaged by transport stream data packet form in ISO/IEC 13818-1 standards.
7. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 6, it is characterised in that also
Including step：After time-division demultiplexer is parsed and is judged as command packet, order segment data in check command packet
Correctness, then the order data that link layer is extracted from order segment data.
8. the method for realizing order and transmission flow multiplex in DVB-CI interfaces according to claim 1-7 any one, its
It is characterised by, the self-defined zoned format includes：The table_id of 8 bit；The piecemeal synchronizing indication position of 1bit
Section_syntax_indicator, should put ' 1 '；The order block length command_section_length of 16bit, shows
The byte number of this segmentation after command_section_length fields；The piecemeal numbering section_number of 16bit,
The section_number of the segmentation of order data first should be 0x00, and it will increase each additional segments with order data
Plus 1；The bit fields of last_section_number 16, represent the number of last segmentation of order data；data_byte
Data are the fragment or data cell of link layer order data；The CRC_32 fields of 32bit, are included in complete order point for the treatment of
The value that CRC is output as zero CRC is calculated after section.
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| CN106330629A (en) * | 2015-06-29 | 2017-01-11 | 深圳市中兴微电子技术有限公司 | Ethernet interface and data processing device and method thereof |
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| CN1481158A (en) * | 2003-07-22 | 2004-03-10 | 深圳市国微电子股份有限公司 | Method for realizing common interface based on USB bus |
| CN1581868A (en) * | 2003-08-03 | 2005-02-16 | 清华大学 | General serial data two-way transmission interface |
| CN101803360A (en) * | 2007-07-30 | 2010-08-11 | 索尼英国有限公司 | Transport stream module for digital television receiver |
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| JP4006612B2 (en) * | 1999-09-27 | 2007-11-14 | ソニー株式会社 | DATA PROCESSING DEVICE AND DATA PROCESSING METHOD, RECORDING MEDIUM, DIGITAL BROADCAST RECEIVING DEVICE, AND RECORDING / REPRODUCING METHOD IN DIGITAL BROADCAST RECEIVING DEVICE |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481158A (en) * | 2003-07-22 | 2004-03-10 | 深圳市国微电子股份有限公司 | Method for realizing common interface based on USB bus |
| CN1581868A (en) * | 2003-08-03 | 2005-02-16 | 清华大学 | General serial data two-way transmission interface |
| CN101803360A (en) * | 2007-07-30 | 2010-08-11 | 索尼英国有限公司 | Transport stream module for digital television receiver |
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