CN101094418A - Data process method of mobile multimedia terminal - Google Patents
Data process method of mobile multimedia terminal Download PDFInfo
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- CN101094418A CN101094418A CN 200710129498 CN200710129498A CN101094418A CN 101094418 A CN101094418 A CN 101094418A CN 200710129498 CN200710129498 CN 200710129498 CN 200710129498 A CN200710129498 A CN 200710129498A CN 101094418 A CN101094418 A CN 101094418A
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Abstract
The method comprises: 1)the receiving end makes cyclic redundancy check for the data segment head of the received multiplexing sub frame; if it is correct, then buffering the length of the data segment head; 2) if it is wrong, then getting the buffered data segment head length of previous multiplexing subframe, and according to the data segment head length of previous multiplexing subframe, determining the initial location of current multiplexing subframe data segment, and analyzing the data segment in current multiplexing subframe from the initial location of said data segment.
Description
Technical field
The present invention relates to the digital mobile communication field, relate in particular to a kind of data processing method of mobile multi-media terminal.
Background technology
In recent years, digital mobile multimedia broadcasting (being mobile TV again) technical development is rapid, for its terminal use provides many service content, programs such as for example advertisement, weather forecast, news, sports cast, variety, multimedia broadcasting play, film, the user can select the service program of Mobile Multimedia Broadcasting according to the hobby of oneself.Corresponding therewith, the also corresponding appearance of various mobile multimedia standards, Ou Zhou DVB-H (Digital Video Broadcast Handheld for example, the reception of digital video broadcast-handheld formula) MediaFLO (the Media Forward Link Only of standard, the U.S., the single forward link of medium) CMMB (China Mobile Multimedia Broadcasting, the Mobile Multimedia Broadcasting) standard etc. of standard and China.
In Chinese CMMB standard, Mobile Multimedia Broadcasting adopts time division way to send various multi-media broadcasting services, the duration of a broadcast channel frame is 1 second, is made up of 40 25 milliseconds of time slots, and one or more time slots can carry the data of a multiplexed frame encapsulation.One and another multiplexed frame sends continuously, passes to information such as terminal sound, image.
With reference to shown in Figure 1, be the schematic diagram that concerns of multiplexed frame and multiplexed sub frame.Multiplexed frame 0 is used for communicating control information, and the structure of other multiplexed frames except that multiplexed frame 0 is divided into multiplex frame head, multiplexed frame payload and fills three parts.The multiplexed frame payload is made up of one or more multiplexed sub frames, comprises 15 multiplexed sub frames at most.Multimedia service of each multiplexed sub frame carrying.
With reference to shown in Figure 2, be the structural representation of multiplex frame head.The length information that has also comprised each multiplexed sub frame in the multiplex frame head except various control information table updating sequence numbers, multiplex frame head adopt CRC (Cyclic Redundancy Check, the cyclic redundancy check (CRC)) verification of 32 bits.
With reference to shown in Figure 3, be the structural representation of multiplexed sub frame.Multiplexed sub frame is made up of subframe head, video-frequency band, audio section and data segment.The multiplexed sub frame head has comprised multiplexed sub frame head length degree, initial reproduction time, video-frequency band length, audio section length, data segment, length, expansion area parameter etc., adopts 32 bit CRC check.
With reference to shown in Figure 4, be the structural representation of data segment.Data segment is made up of data segment header and a plurality of data cell.Data segment header has been described the parameter of each data cell, adopts 32 bit CRC check.
With reference to shown in Figure 5, be the structural representation of data cell.Each data cell can be carried the packet on one or more upper strata, and beginning of each data cell is the initial code sign 0X112F of one 16 bit, the beginning of a data unit of sign.In the practical application, can separate sign to the initial sum that initial code be regarded a data unit as, define some data cells in the data buffer zone of containing a plurality of data cells with this.
After mobile multi-media broadcast terminal is received multiplexed frame in the CMMB system, carry out following several demultiplexing processing procedure:
1) multiplexed frame is resolved obtains needed multiplexed sub frame, promptly current multiplexed sub frame;
2) current multiplexed sub frame is parsed video-frequency band, audio section and data segment;
3) video-frequency band, audio section, data segment are resolved to the payload of video unit, audio unit, data cell respectively.
Structure to multiplexed sub frame is analyzed, and we can find following characteristics:
1) each segment length in multiplexed sub frame length=multiplexed sub frame head length degree+4 bytes+subframe;
2) the multiplexed sub frame head consists of: 15 bytes+4 bytes (CRC32)+expansion area length; Consider the characteristics of broadcasting service, expansion area length is generally 0 or regular length;
3) for a multiplexed sub frame, the length of each section can obtain from the multiplexed sub frame head in the subframe, in addition, also has a kind of method can obtain the length of each section, promptly resolves when correct when the video paragraph header in the subframe, audio frequency paragraph header and data segment header:
The length of video-frequency band=video-frequency band head length degree+4 (length of CRC32)+each video unit length;
The length of audio section=audio section head length degree+4 (length of CRC32)+each audio unit length;
The length of data segment=data segment header length+4 (length of CRC32)+each data unit length.
The CMMB system carries out multimedia broadcasting by air traffic channel, because wireless environment is very complicated, even if adopted the chnnel coding of excellent performance, also can't avoid occurring the situation of channel error code.Mobile multi-media broadcast terminal relates to the data segment header CRC check of multiplexed sub frame when the reception data are carried out the demultiplexing processing.General way is that the data segment header CRC check of multiplexed sub frame is calculated at present, if detect crc error, terminal just abandons all data of the data segment of this multiplexed sub frame.
With reference to shown in Figure 6, be existing data segment process flow figure.This method may further comprise the steps:
Step 601: obtain multiplex frame head length;
Step 602: obtain the data of multiplex frame head and carry out the CRC32 verification;
Step 603: handle for the multiplex frame head data,, comprise the urgent broadcast indication as the control information table updating sequence number is handled; If next frame parameter is arranged, the buffer memory relevant parameter obtains the length of each multiplexed sub frame in the multiplexed frame;
Step 604: according to current subframe sequence number data pointer is moved on to the section start of current multiplexed sub frame, (deviant is: each subframe lengths sum before the current subframe of multiplex frame head+CRC32+) to begin to handle current multiplexed sub frame;
Step 605: obtain the length of current multiplexed sub frame head, obtain multiplexed sub frame head data then, and the multiplexed sub frame head is carried out the CRC32 verification;
Step 606: the length and the initial reproduction time that obtain each section in the subframe;
Step 607: obtain the length of data segment header, obtain the data segment header data then and carry out the CRC32 verification;
Step 608: whether judgment data paragraph header CRC check is correct; Correct execution in step 610 then, otherwise execution in step 609;
Step 609: abandon multiplexed sub frame data segment data, finish.
Step 610: data cell is handled in the multiplexed sub frame, finishes.
Multiplexed frame was that unit carries out multiplexing to business with one second, all data segment data that the data that abandon a multiplexed frame are equivalent to transmit in one second all abandon, can cause the Data Receiving of terminal temporarily to stop, having a strong impact on the data service on upper strata, efficiency of transmission is very low.
Such processing procedure just causes the reception of terminal very responsive to channel bit error rate, and anti-error ratio characteristic is very poor, has had a strong impact on user experience.
As previously mentioned, in actual applications, press for the receptivity that improves mobile multi-media broadcast terminal.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of data processing method of mobile multi-media terminal, improves the receptivity of terminal.
In order to solve the problems of the technologies described above, the invention provides a kind of data processing method of mobile multi-media terminal, said method comprising the steps of:
(1) receiving terminal carries out cyclic redundancy check (CRC) to the data segment header data of the multiplexed sub frame that receives, and verification is correct, then data cached paragraph header length;
(2) if the cyclic redundancy check error of the data segment header of current multiplexed sub frame, then obtain the data segment header length of a last multiplexed sub frame of buffer memory, determine the original position of current multiplexed sub frame data segment according to the data segment header length of a described last multiplexed sub frame, and begin data segment the current multiplexed sub frame is resolved from the original position of described data segment.
Further, described method is further comprising the steps of:
(3) seek the initial code sign of each data cell, obtain the data of each data cell according to the initial code sign of described each data cell.
Further, determine the original position of current multiplexed sub frame data segment described in the step (2) according to the data segment header length of a last multiplexed sub frame, comprising: cross the original position of a deviant as current multiplexed sub frame data segment according to the data segment header length of jump of a last multiplexed sub frame.
Further, described deviant is that the data segment header length of a described last multiplexed sub frame adds 4 bytes.
Further, step also comprises in (1): the length of each unit in data cached section, and obtain the data of each unit according to the initial code of each unit sign.
With respect to the demultiplexing processing method of existing mobile multi-media terminal to data segment, method of the present invention can avoid abandoning because of the data segment header mistake data of whole multiplexed sub frame data segment, the data of having avoided transmitting in one second all abandon, thereby the Data Receiving of having avoided terminal temporarily stops, having a strong impact on the data service on upper strata and causes the low situation of efficiency of transmission, has improved the receptivity of terminal.
Description of drawings
Fig. 1 is the schematic diagram that concerns of multiplexed frame and multiplexed sub frame;
Fig. 2 is the structural representation of multiplex frame head;
Fig. 3 is the structural representation of multiplexed sub frame;
Fig. 4 is the structural representation of data segment;
Fig. 5 is the structural representation of data cell;
Fig. 6 is existing data segment process flow figure;
Fig. 7 is data segment process flow figure of the present invention.
Embodiment
The present invention improves the method for receiving performance of mobile multimedia broadcasting terminal, make terminal detect under the vicious situation of data segment header CRC, the location of data segment original position is undertaken by the data segment header information that provides in the multiplexed sub frame of once receiving before making full use of, and employing data cell initial code mark location data cell, extract relevant data unit data, improve the receptivity of terminal.
The present invention mainly may further comprise the steps:
(1) when the deal with data paragraph header, if check CRC correct, handles the data cell in the multiplexed sub frame, obtains the length of each unit of data segment, and obtains the data of each unit, preserves data segment header length;
(2) if multiplex frame head data segment header crc error, utilize last time data segment header length of jump to cross the data that respective length adds 4 byte CRC32 and come the locator data paragraph header, and seek data cell initial code sign, locate corresponding data cell, thereby obtain each cell data.
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail:
With reference to shown in Figure 7, be data segment process flow figure of the present invention.This method may further comprise the steps:
Step 701: terminal at first obtains multiplex frame head length when carrying out the multiplexed frame processing;
Step 702: read the data of multiplex frame head,
Step 703: handle for the multiplex frame head data,, comprise the urgent broadcast indication as handling for the control information table updating sequence number; Preserve multiplex frame head length, if next frame parameter is arranged, the buffer memory relevant parameter; Obtain each subframe lengths in the multiplexed frame;
Step 704: according to the target-subframe sequence number, (deviant is: each subframe lengths sum before multiplex frame head+CRC32+ target-subframe) data to read target-subframe according to deviant;
Step 705: obtain the length of target multiplexed sub frame head, obtain target multiplexed sub frame head data then;
Step 706: obtain the data segment header data and carry out the CRC32 verification;
Step 707: whether judgment data paragraph header CRC is correct, as correctly, and execution in step 710, otherwise execution in step 708;
Step 708: utilize last time data segment header length of jump to cross the data of respective length+4 byte CRC32;
Step 709: seek data cell initial code sign 0X112F and locate units corresponding, thereby obtain each cell data, finish;
Step 710: data cell is handled in the multiplexed sub frame;
Step 711: obtain the length of each unit of data segment, and obtain the data of each unit, preserve data segment header length, finish.
So far, finished the reception processing procedure of the data segment of a multiplexed sub frame.
To the processing of the data segment header of multiplexed sub frame, make full use of the data segment header length information of a last multiplexed sub frame among the present invention, and utilized the initial code of data cell to identify the data that obtain data cell behind the locator data unit.When the data segment header crc error, avoid professional inefficiency of terminal data and serious interrupted situation like this, can improve the receptivity of terminal under the error code condition significantly.
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 skilled 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 (5)
1, a kind of data processing method of mobile multi-media terminal is characterized in that, said method comprising the steps of:
(1) receiving terminal carries out cyclic redundancy check (CRC) to the data segment header data of the multiplexed sub frame that receives, and verification is correct, then data cached paragraph header length;
(2) if the cyclic redundancy check error of the data segment header of current multiplexed sub frame, then obtain the data segment header length of a last multiplexed sub frame of buffer memory, determine the original position of current multiplexed sub frame data segment according to the data segment header length of a described last multiplexed sub frame, and begin data segment the current multiplexed sub frame is resolved from the original position of described data segment.
2, the method for claim 1 is characterized in that, described method is further comprising the steps of:
(3) seek the initial code sign of each data cell, obtain the data of each data cell according to the initial code sign of described each data cell.
3, the method for claim 1, it is characterized in that, determine the original position of current multiplexed sub frame data segment described in the step (2) according to the data segment header length of a last multiplexed sub frame, comprising: cross the original position of a deviant as current multiplexed sub frame data segment according to the data segment header length of jump of a last multiplexed sub frame.
4, method as claimed in claim 3 is characterized in that, described deviant is that the data segment header length of a described last multiplexed sub frame adds 4 bytes.
5, the method for claim 1 is characterized in that, step also comprises in (1): the length of each unit in data cached section, and obtain the data of each unit according to the initial code of each unit sign.
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| CN 200710129498 CN100551077C (en) | 2007-07-19 | 2007-07-19 | A kind of data processing method of mobile multi-media terminal |
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| CN 200710129498 CN100551077C (en) | 2007-07-19 | 2007-07-19 | A kind of data processing method of mobile multi-media terminal |
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| CN101094418A true CN101094418A (en) | 2007-12-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272220B (en) * | 2008-04-30 | 2010-05-12 | 中兴通讯股份有限公司 | Data resolution method |
| CN102196273A (en) * | 2010-03-10 | 2011-09-21 | 中兴通讯股份有限公司 | Method and device for protecting mobile multimedia broadcasting interframe data |
| CN103607258A (en) * | 2013-11-18 | 2014-02-26 | 深圳市道通科技有限公司 | Method, device and system for communication between primary device and secondary device in vehicle computer diagnosis device |
| CN106019325A (en) * | 2015-03-25 | 2016-10-12 | 马维尔国际贸易有限公司 | Method and apparatus for updating and providing satellite navigation message |
| CN111540456A (en) * | 2020-06-08 | 2020-08-14 | 安翰科技(武汉)股份有限公司 | Data loading method and capsule endoscope image acquisition system thereof |
-
2007
- 2007-07-19 CN CN 200710129498 patent/CN100551077C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272220B (en) * | 2008-04-30 | 2010-05-12 | 中兴通讯股份有限公司 | Data resolution method |
| CN102196273A (en) * | 2010-03-10 | 2011-09-21 | 中兴通讯股份有限公司 | Method and device for protecting mobile multimedia broadcasting interframe data |
| CN102196273B (en) * | 2010-03-10 | 2013-08-07 | 中兴通讯股份有限公司 | Method and device for protecting mobile multimedia broadcasting interframe data |
| CN103607258A (en) * | 2013-11-18 | 2014-02-26 | 深圳市道通科技有限公司 | Method, device and system for communication between primary device and secondary device in vehicle computer diagnosis device |
| CN103607258B (en) * | 2013-11-18 | 2018-07-06 | 深圳市道通科技股份有限公司 | The communication means of master-slave equipment, apparatus and system in Development in Vehicle On-Board Diagnostics equipment |
| CN106019325A (en) * | 2015-03-25 | 2016-10-12 | 马维尔国际贸易有限公司 | Method and apparatus for updating and providing satellite navigation message |
| CN106019325B (en) * | 2015-03-25 | 2021-01-08 | 马维尔亚洲私人有限公司 | Method and apparatus for updating and providing satellite navigation messages |
| CN111540456A (en) * | 2020-06-08 | 2020-08-14 | 安翰科技(武汉)股份有限公司 | Data loading method and capsule endoscope image acquisition system thereof |
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| CN100551077C (en) | 2009-10-14 |
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