CN101267571B - A reuse device and method - Google Patents
A reuse device and method Download PDFInfo
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- CN101267571B CN101267571B CN200810093234XA CN200810093234A CN101267571B CN 101267571 B CN101267571 B CN 101267571B CN 200810093234X A CN200810093234X A CN 200810093234XA CN 200810093234 A CN200810093234 A CN 200810093234A CN 101267571 B CN101267571 B CN 101267571B
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Abstract
The invention relates to a re-multiplexing device, consisting of an input module, a central processing module, an output module, a console module and a standard time module. The invention also relates to a re-multiplexing method, comprising the steps that the input module composes the multi-channel inputted PMS format bit stream data into a multiplexing frame and caches the multiplexing frame; the central processing module decomposes the multiplexing frame in the input module into multiplexing subframes, and generates a multiplexing frame with the needed multiplexing subframes, the control information sent by the console module, and the standard time provided by the standard time module, according to a multiplexing protocol; the central processing module writes the generated multiplexing frame into the output module; the output module caches and segments the received multiplexing frame, and packs into PMS format bit stream data and then outputs the bit stream data. By using the invention, no special FIFO cache chip is needed, and the load of re-multiplexing software module can be reduced.
Description
Technical field
The present invention relates to the China Mobile multimedia broadcasting field, relate in particular to a kind of reuse device and method.
Background technology
Mobile Multimedia Broadcasting (mobile TV) is a kind of Play Technique for Multimedia of rising in recent years.The user can watch multimedia programmings such as TV by using portable terminal under the situation of high-speed mobile.Portable terminal can receive the multimedia service programme by wireless broadcast channel, and can select own programs of interest, thus receiving multimedia data stream, to be implemented in the function of multimedia programmings such as televiewing on the portable terminal.
Mobile Multimedia Broadcasting has a plurality of industry standards and deposits in the world at present, and wherein CMMB (ChinaMultimedia Mobile Broadcasting, China Mobile multimedia broadcasting) is the mobile TV industry standard of Chinese independent research, has been subjected to paying attention to widely.This standard comprises a plurality of parts, wherein the multiplexing normalized definition of part 2 what transmit on the mobile multimedia broadcasting channel is broadcast channel frame, wherein broadcast channel frame is made up of a plurality of multiplexed frames, each multiplexed frame is made up of a plurality of multiplexed sub frames, is encapsulating data such as video, audio frequency, data and control information in the multiplexed sub frame.What multiplexer was exported is its bit stream data that multiplexed frame is carried out PMS (Packetized Multiplexing Stream, the multiplex stream of the packing) form of cutting and the formation of encapsulation back according to certain size.Multiplexing again is to export after PMS bit stream data with multiplexer output is multiplexed with one road PMS bit stream data again, launches the function of exporting again after so just can realizing the program source of a plurality of multiplexers outputs merged into one tunnel program source.
The mode of at present common multiplexing main employing software repeated usage: the input transport stream enters special-purpose FIFO (first-in first-out) chip buffer memory through behind the input interface chip; CPU (central processing unit) or DSP (Digital Signal Processing) read transmit flow data and handle with multiplexing from fifo chip, output to buffer memory in special-purpose fifo chip or SRAM (static RAM) chip then; Transport stream after multiplexing is exported from output interface chip.Adopt this method to carry out again the multiplexing following problem that exists: 1) the special-purpose FIFO cache chip of needs; 2) there is not standard time information; 3) all multiplexing again operations are all finished by software, and this will cause the Multiplexing module load very big again; 4) can't be configured with unit state multiplex data again and monitor.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of multiplexing again apparatus and method, the PMS code stream of multiplexer output is multiplexed with one road PMS code stream again, to realize " People's Republic of China's radio, film and television industry standard Mobile Multimedia Broadcasting part 2: multiplexing " defined multiplexing again function.
For addressing the above problem, the invention provides a kind of reuse device, be applied in the China Mobile multimedia broadcasting system, comprise input module, output module, central processing module, control desk module and standard time module;
Described input module is used for buffer memory behind the bit stream data composition multiplexed frame of the multiplex stream PMS form of the multichannel packing of outside input; Described central processing module is used for the multiplexed frame of described input module is decomposed into multiplexed sub frame, and forms multiplexed frame according to the control information that multiplex protocol is its configuration with required multiplexed sub frame and described control desk module; Described output module is used for the multiplexed frame after the processing of the described central processing module of buffer memory output, and exports with its cutting and after being packaged as the bit stream data of PMS form; Employed control information when described control desk module is used to described central processing module configuration multiplexing again; Described standard time module is used to described central processing module that the standard time is provided.
Further, said apparatus also can have following feature:
Described central processing module also is used for sending to described control desk module the running state information of described re-multiplexer device; Described control desk module also is used to show the running state information of described central processing module to the described re-multiplexer device of its transmission;
Further, said apparatus also can have following feature:
Comprise at least one input interface chip and a framing unit in the described input module, described framing unit is used for the bit stream data of multichannel PMS form that will be by the input of described input interface chip and forms multiplexed frame and buffer memory.
Further, said apparatus also can have following feature:
Described framing unit is a field programmable gate array chip.
Further, said apparatus also can have following feature:
Comprise CPU, internal storage location and memory cell in the described central processing module; Described CPU is used for multiplexed frame is handled; Described internal storage location is used to the operation of program that internal memory is provided; Described memory cell is used to store the program file and the configuration information of needs operation.
Further, said apparatus also can have following feature:
Described CPU is a central processing unit; Described internal storage location is the static RAM storage chip; Described memory cell is the FLASH storage chip.
Further, said apparatus also can have following feature:
Comprise all subdivisions and one first output interface chip in the described output module; Described cutting unit is used for the multiplexed frame after the processing of the described central processing module of buffer memory output, and to its bit stream data that carries out cutting and be packaged as the PMS form; Described first output interface chip is used for the output with the bit stream data of described PMS form.
Further, said apparatus also can have following feature:
Also comprise one second interface chip in the described output module, it is used for when described first output interface chip is exported the bit stream data of described PMS form, described bit stream data is detected or by it described bit stream data is transferred to other place by it and launch.
Further, said apparatus also can have following feature:
Described cutting unit is a field programmable gate array chip.
Further, said apparatus also can have following feature:
Described control desk module is realized by operation special-purpose software on computers.
Further, said apparatus also can have following feature:
Described standard time module is made of GPS module, and the described standard time is the global positioning system standard time.
Further, said apparatus also can have following feature:
The data/address bus of described central processing module by central processing unit on it respectively with described input module in framing unit and the cutting unit in the output module carry out the data write operation; It also carries out communication by Fast Ethernet mouth and the described control desk module of 100M, receives described standard time module to the standard time of its transmission data message by serial ports.
The present invention also provides a kind of remultiplexing method, is applied to may further comprise the steps in the above-mentioned reuse device:
Buffer memory got up after a, input module were formed multiplexed frame with the bit stream data of the multiplex stream PMS form of the packing of multichannel input;
B, central processing module are decomposed into multiplexed sub frame with the multiplexed frame in the described input module, and required multiplexed sub frame, control desk module are reached the standard time that is provided by the standard time module to the control information of its transmission, generate multiplexed frame according to multiplex protocol;
C, described central processing module write output module with the multiplexed frame that generates;
D, described output module carry out buffer memory to the multiplexed frame that receives, and export with its cutting and after being packaged into the bit stream data of PMS form then.
Further, said method also can have following feature:
Among the step c, described central processing module writes described output module according to the parameter channel configuration in the described control information with described multiplexed frame.
Further, said method also can have following feature:
In any step after step a, also comprise: described central processing module sends to described control desk module with the running status of described reuse device.
Adopt the present invention, by using FPGA (field programmable gate array) chip that the PMS bit stream data of input is carried out framing, the multiplexed frame of exporting is decomposed into the PMS flow data, no longer need to use special-purpose FIFO cache chip, can also reduce again the load of multiplexing software module simultaneously.The control desk module that increases realized the configuration and the condition monitoring of multiplex data again, and the GPS module that increases provides standard time information for multiplexing operation again.
Description of drawings
Fig. 1 is a reuse device hardware configuration schematic diagram in the embodiment of the invention;
Fig. 2 is the flow chart of remultiplexing method in the embodiment of the invention;
Fig. 3 is a multiplexing again application example schematic diagram in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Reuse device provided by the invention as shown in Figure 1, comprises input module, output module, central processing module, standard time module and control desk module.
Input module is used for buffer memory behind the multichannel PMS code stream composition multiplexed frame of outside input.Comprising a FPGA (field programmable gate array) chip and at least one input interface chip;
Central processing module is used for the multiplexed frame of input module is decomposed into multiplexed sub frame, and is receiving the control desk module after the control information of its transmission, according to multiplex protocol required multiplexed sub frame and above-mentioned control information is reformulated multiplexed frame; It also is used for the running status to control desk module output reuse device, and running status comprises: whether operation is normal, warning information, service data etc.Central processing module is made up of CPU (central processing unit) chip, multi-disc SRAM storage chip and FLASH (flash memory) storage chip.SRAM is the effect that internal memory is played in program running, and the FLASH storage chip is the program file that is used to store the needs operation, the data of configuration information etc., and it can guarantee that data are not lost when power down;
Output module is used for the multiplexed frame after the processing of buffer memory central processing module output, and is to export behind the bit stream data of PMS form its cutting.Be used for the output of PMS code stream and the fpga chip of a realization multiplexed frame cutting function comprising one first output interface chip.Can also comprise other output interface chip (as second interface chip) in this output module, be used for launching again at the second interface chip place these data being detected or be transferred to other place by this second interface chip in the PMS bit stream data output at first output interface chip;
The standard time module is used to central processing module that GPS is provided (global positioning system) standard time.This module is made of the GPS module;
Employed control information when the control desk module is used to the central processing module configuration multiplexing again comprises the channel configuration information of configuration information table, network configuration information table, service configuration information table, multiplexed frame etc.; Also be used to show the running status of central processing module to the re-multiplexer device of its transmission.The control desk module can be finished by operation special-purpose software on computers.
The data/address bus of central processing module by cpu chip respectively with input module and output module in fpga chip carry out the data write operation, the control desk module of moving on Fast Ethernet mouth by 100M and the computer is carried out communication, the standard time data message that sends by serial ports acceptance criteria time module.
This device is realized multiplexing again method, as shown in Figure 2, may further comprise the steps:
The first step: input module is formed multiplexed frame with the PMS bit stream data of multichannel input;
Second step: central processing module is decomposed into multiplexed sub frame respectively with each multiplexed frame in the input module.After to be decomposed the finishing, central processing module to the control information of its transmission and the GPS standard time that is provided by the standard time module, generates multiplexed frame according to multiplex protocol with multiplexed sub frame, control desk module.Above-mentioned control information comprises: the channel configuration information of configuration information table, network configuration information table, service configuration information table, multiplexed frame etc.;
The 3rd step: central processing module writes output module with the multiplexed frame that generates according to the parameter channel configuration that control information provides;
The 4th step: output module carries out buffer memory to the multiplexed frame that receives, and the multiplexed frame of receiving is carried out cutting and packing processing, exports behind the bit stream data of generation PMS form.
In any step after the first step, when central processing module need (break down in as processing procedure) when the control desk module reports its running status, its running status with reuse device sends to the control desk module.
This device has carried out rational decomposition to " People's Republic of China's radio, film and television industry standard Mobile Multimedia Broadcasting part 2: multiplexing " defined multiplexing again function, realizes on different modules respectively.The invention of this device can be finished the function that the PMS code stream of multiplexer output is multiplexed into again one road PMS code stream accurately and efficiently.
As shown in Figure 3, the China Mobile multimedia broadcasting system is made up of encoder, multiplexer, reuse device, modulator, transmitter and portable terminal.Reuse device provided by the invention is applied in the mobile multi-medium system, the PMS code stream of multiplexer output is inserted reuse device, PMS bit stream data after multiplexing is again outputed to modulator, by transmitter broadcast channel data is launched afterwards.Portable terminal is with the broadcast channel data that the receives broadcast of decoding.The invention of these apparatus and method provides possibility for the wireless transmission of the TV programme of multichannel PMS code stream, and this device can be widely used in broadcast television industry as a kind of key device of the mobile multi-media service that provides.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (15)
1. a reuse device is applied to it is characterized in that in the China Mobile multimedia broadcasting system, comprises input module, output module, central processing module, control desk module and standard time module;
Described input module is used for buffer memory behind the bit stream data composition multiplexed frame of the multiplex stream PMS form of the multichannel packing of outside input; Described central processing module is used for the multiplexed frame of described input module is decomposed into multiplexed sub frame, and is that multiplexed frame is formed in the control information of described central processing module configuration according to multiplex protocol with described multiplexed sub frame and described control desk module; Described output module is used for the multiplexed frame after the processing of the described central processing module of buffer memory output, and exports with its cutting and after being packaged as the bit stream data of PMS form; Employed control information when described control desk module is used to described central processing module configuration multiplexing again; Described standard time module is used to described central processing module that the standard time is provided.
2. device as claimed in claim 1 is characterized in that,
Described central processing module also is used for sending to described control desk module the running state information of described reuse device; Described control desk module also is used to show the running state information of described central processing module to the described reuse device of its transmission;
3. device as claimed in claim 1 is characterized in that,
Comprise at least one input interface chip and a framing unit in the described input module, described framing unit is used for the bit stream data of multichannel PMS form that will be by the input of described input interface chip and forms multiplexed frame and buffer memory.
4. device as claimed in claim 3 is characterized in that,
Described framing unit is a field programmable gate array chip.
5. device as claimed in claim 1 is characterized in that,
Comprise CPU, internal storage location and memory cell in the described central processing module; Described CPU is used for multiplexed frame is handled; Described internal storage location is used to the operation of program that internal memory is provided; Described memory cell is used to store the program file and the configuration information of needs operation.
6. device as claimed in claim 5 is characterized in that,
Described CPU is a central processing unit; Described internal storage location is the static RAM storage chip; Described memory cell is the FLASH storage chip.
7. device as claimed in claim 1 is characterized in that,
Comprise all subdivisions and one first output interface chip in the described output module; Described cutting unit is used for the multiplexed frame after the processing of the described central processing module of buffer memory output, and to its bit stream data that carries out cutting and be packaged as the PMS form; Described first output interface chip is used for the bit stream data output with described PMS form.
8. device as claimed in claim 7 is characterized in that,
Also comprise one second interface chip in the described output module, it is used for when described first output interface chip is exported the bit stream data of described PMS form, described bit stream data is detected or by it described bit stream data is transferred to other place by it and launch.
9. device as claimed in claim 7 is characterized in that,
Described cutting unit is a field programmable gate array chip.
10. device as claimed in claim 1 or 2 is characterized in that,
Described control desk module is realized by operation special-purpose software on computers.
11. device as claimed in claim 1 is characterized in that,
Described standard time module is made of GPS module, and the described standard time is the global positioning system standard time.
12. as claim 1,2,3,5 or 7 described devices, it is characterized in that,
The data/address bus of described central processing module by central processing unit on it respectively with described input module in framing unit and the cutting unit in the output module carry out the data write operation; It also carries out communication by Fast Ethernet mouth and the described control desk module of 100M, receives described standard time module to the standard time of its transmission data message by serial ports.
13. a remultiplexing method is applied to it is characterized in that in the reuse device as claimed in claim 1, may further comprise the steps:
Buffer memory got up after a, input module were formed multiplexed frame with the bit stream data of the multiplex stream PMS form of the packing of multichannel input;
B, central processing module are decomposed into multiplexed sub frame with the multiplexed frame in the described input module, and control information that described multiplexed sub frame, control desk module are sent to described central processing module and the standard time that provides by the standard time module, generate multiplexed frame according to multiplex protocol;
C, described central processing module write output module with the multiplexed frame that generates;
D, described output module carry out buffer memory to the multiplexed frame that receives, and export with its cutting and after being packaged into the bit stream data of PMS form then.
14. method as claimed in claim 13 is characterized in that,
Among the step c, described central processing module writes described output module according to the parameter channel configuration in the described control information with described multiplexed frame.
15. method as claimed in claim 13 is characterized in that,
In any step after step a, also comprise: described central processing module sends to described control desk module with the running status of described reuse device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810093234XA CN101267571B (en) | 2008-04-23 | 2008-04-23 | A reuse device and method |
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| CN200810093234XA CN101267571B (en) | 2008-04-23 | 2008-04-23 | A reuse device and method |
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| CN101267571A CN101267571A (en) | 2008-09-17 |
| CN101267571B true CN101267571B (en) | 2011-05-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101674485B (en) * | 2009-10-13 | 2012-02-08 | 中兴通讯股份有限公司 | Selected output device of packaging multiplexing code stream and method thereof |
| CN101754024B (en) * | 2009-12-16 | 2012-01-11 | 中兴通讯股份有限公司 | Multiplexing device and multiplexing method |
| CN101977286B (en) * | 2010-11-30 | 2012-09-26 | 福州大学 | Digital television program replacing device |
| CN103152610A (en) * | 2013-02-04 | 2013-06-12 | 奥维通信股份有限公司 | China mobile multimedia broadcasting (CMMB) multiplexer (MUX) provided with Ethernet output interface |
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