CN101102509A - A data synchronization method for mobile multimedia broadcast system - Google Patents
A data synchronization method for mobile multimedia broadcast system Download PDFInfo
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Abstract
The method comprises: a) when generating the multiplexing frame, adding a separator into the media segment tail of each multiplexing subframe, and making the encapsulation for it; b) transmitting the generated multiplexing frame; when the mobile multimedia broadcast has a transmission error, the receiving end uses the separator to extract the service data stream of the media segment in order to make the fault-tolerant treatment.
Description
Technical field
The present invention relates to the China mobile multi-media broadcasting technology field, particularly the method for synchronous of business data flow in the mobile multimedia broadcast system.
Background technology
Mobile Multimedia Broadcasting is the Play Technique for Multimedia of a kind of broadcast mode of rising in recent years.By hand-held terminal, under the situation of high-speed mobile, can watch multimedia services such as TV.Terminal receives the multimedia service programme by wireless broadcast channel, and can select the channel of oneself having the right to watch, accepts to select the multi-medium data of channel, sees TV on the portable terminal thereby be implemented in.
Present most of mobile multimedia broadcast system adopts the MPEG2 transport stream mode to realize the synchronous of data flow, and this is a kind of transmission mode of fixed length; Its first byte is fixed, thereby reaches the purpose of synchronization of data streams.And in the mobile multimedia broadcast system of China, the multiplexed frame structure is a kind of elongated transmission mode.The multiplexed frame structure comprises Payload, and the multiplexed frame frame head of being made up of contents such as length information and media parameter.Realize the synchronous of data flow at the initial code of one 32 of multiplex frame head definition.Because multiplexed frame is long, in the process of wireless environment transmission, it is bigger wrong possibility to occur, take place easily such as situations such as error code, dislocation, loss of datas, cause multiplexed frame imperfect, need thus the business data flow of whole multiplexed frame is abandoned, make the transmission benefit of China Mobile multimedia broadcasting system descend, and do not reach purpose of design.
The multiplexed frame of China Mobile multimedia broadcasting system has defined the encapsulation format of data flow, and a multiplexed frame is made up of a plurality of multiplexed sub frames, and the quantity of multiplexed sub frame is included in the multiplex frame head.Wherein in each multiplexed sub frame the encapsulation multi-media broadcasting service content, its structure as shown in Figure 1, multiplexed sub frame comprises multiplexed sub frame head, video-frequency band, audio section and data segment.
And in a multiplexed frame, do not have separator to separate between multiplexed sub frame and the multiplexed sub frame, can not indicate the end and the beginning of different multiplexed sub frames; Equally, do not have separator to isolate between video-frequency band, audio section and the data segment in multiplexed sub frame yet, in wireless broadcast network, transmit lost part data when making a mistake, cause the data shift of multiplexed frame when the multiplexed frame data flow; And according to the locator data stream exactly of the length information in multiplex frame head or the multiplexed sub frame head, can't correctly parse the data of multiplexed sub frame or video-frequency band, audio section and data segment, thereby can't realize wrong the isolation, the diffusion that leads to errors has greatly influenced the efficiency of transmission of multi-media broadcasting system.Therefore, the multiplexed frame of existing mobile multimedia broadcast system need increase separator, realizes the synchronous of business data flow, thereby realizes transmission efficiently.
Summary of the invention
Technical problem to be solved by this invention provides the method for synchronous of business data flow in a kind of mobile multimedia broadcast system, the business data flow that can correctly extract each media segment in the multiplexed sub frame when multiplexed frame generation data generation error of transmission is isolated thereby realization is wrong effectively for fault-tolerant processing.
In order to solve the problems of the technologies described above, the invention provides the method for synchronous of business data flow in a kind of mobile multimedia broadcast system, it may further comprise the steps:
When (a) generating multiplexed frame, add separator and encapsulate at the media segment afterbody of the multiplexed sub frame of multiplexed frame;
(b) multiplexed frame that send to generate, when Mobile Multimedia Broadcasting generation error of transmission, receiving terminal correctly extracts the business data flow of media segment according to separator, to carry out fault-tolerant processing.
Further, step (a) also is included in the length that comprises separator in the length of media segment of multiplexed sub frame head indication.
Further, media segment comprises one or more in video-frequency band, audio section and the data segment, and the afterbody of the one or more media segments that comprise at multiplexed sub frame is inserted with corresponding separator.
Further, step (b) also is included in and is provided for the separation designator of representing whether separator exists in the multiplexed frame.
Further, separating designator is arranged in the control information table of multiplexed frame.
Further, separator comprises one or more in first separator, second separator and the 3rd separator; Wherein:
Step (a) first separator is added in the afterbody of video-frequency band, and the length of first separator is included in the length of the described video-frequency band in the multiplexed sub frame head; Second separator is added in the audio section afterbody, and the length of second separator is included in the length of the audio section in the multiplexed sub frame head; The 3rd separator is added in the afterbody of data segment; And the length of the 3rd separator is included in the length of the data segment in the multiplexed sub frame head;
Step (b) receiving terminal judges that according to first separator data flow of video-frequency band finishes, and begins to extract the data flow of media segment thereafter or next multiplexed sub frame; Or separate to judge that according to second the data flow of audio section finishes, the data flow of media segment thereafter or next multiplexed sub frame is correctly extracted in beginning; Or finish the correct business data flow that extracts next multiplexed sub frame of beginning according to the data flow of the 3rd separator judgment data section.
Further, step (a) encapsulation comprises: the regulation according to the multiplexed frame form is pressed the encapsulation of video unit form with first separator, and second separator is pressed the encapsulation of audio unit form, and the 3rd separator is encapsulated by the data cell form.
Further, step (a) encapsulation comprises: the regulation according to the multiplexed frame form is encapsulated in first separator in the video unit by the video multiplex block format, second separator is encapsulated in the audio unit by the audio-frequency multiplex block format, the 3rd separator is encapsulated in the data cell by the data multiplex block format.
In order to solve the problems of the technologies described above, the invention provides the multiplexing frame generating method of business data flow in a kind of mobile multimedia broadcast system, comprise step: the media segment afterbody at the multiplexed sub frame of described multiplexed frame adds separator, and encapsulates.
Further, the inventive method also comprises step: the length that comprises described separator in the length of the described media segment that described multiplexed sub frame head is indicated.
Further, media segment comprises one or more in video-frequency band, audio section and the data segment, and described method is inserted with corresponding separator at the afterbody of one or more media segments that multiplexed sub frame comprises.
Further, separator comprises one or more in first separator, second separator and the 3rd separator; Wherein:
First separator is added in the afterbody of video-frequency band, and the length of first separator is included in the length of the video-frequency band in the multiplexed sub frame head; Second separator is added in the audio section afterbody, and the length of second separator is included in the length of the audio section in the multiplexed sub frame head; The 3rd separator is added in the afterbody of data segment; And the length of the 3rd separator is included in the length of the data segment in the multiplexed sub frame head.
Further, described encapsulation comprises: the regulation according to the multiplexed frame form is pressed the encapsulation of video unit form with first separator, and second separator is pressed the encapsulation of audio unit form, and the 3rd separator is encapsulated by the data cell form.
Further, described encapsulation comprises: the regulation according to the multiplexed frame form is encapsulated in first separator in the video unit by the video multiplex block format, second separator is encapsulated in the audio unit by the audio-frequency multiplex block format, the 3rd separator is encapsulated in the data cell by the data multiplex block format.
Adopt the present invention in multiplexed sub frame, to introduce the multiplexed frame structure of separator, can realize the synchronous of each multiplexed sub frame and video-frequency band thereof, audio section and data segment.Thereby can cause data to be destroyed in the error of transmission that wireless broadcast network takes place the time, data sync by each several part is correctly extracted business data flows such as video, audio frequency, handle for fault-tolerant software, realization is to the timely isolation of mistake, thereby mobile multi-media broadcast service data stream is transmitted efficiently.
Description of drawings
Fig. 1 is the structural representation of prior art multiplexed sub frame;
Fig. 2 increases the multiplexed frame structural representation of separator for the present invention.
Embodiment
The method for synchronous of business data flow in the mobile multimedia broadcast system provided by the invention, on the basis of original multiplex frame head definition initial code, the afterbody at video-frequency band, audio section and the data segment of multiplexed sub frame adds first separator, second separator and the 3rd separator respectively; Wherein, first separator is used to indicate the end of video-frequency band and the beginning of audio section, to realize the synchronizing traffic data of video-frequency band; Second separator is used to indicate the end of audio section and the beginning of data segment, to realize the synchronizing traffic data of audio section; The 3rd separator is used to indicate the end of a multiplexed sub frame and the beginning of next multiplexed sub frame, to realize the synchronizing traffic data of multiplexed sub frame.Such multiplexed frame structure can not only realize the synchronous of multiplexed frame, and can realize the synchronous of multiplexed sub frame, video-frequency band, audio section and data segment one by one.If the error of transmission of wireless broadcast network takes place, cause the data of video-frequency band or audio section to be destroyed, need not abandon whole multiplexed frame, and can correctly extract business data flows such as video, audio frequency according to above-mentioned separator, fault-tolerant software for video, audio frequency is handled, thereby realized wrong isolation effectively, made that the China Mobile multimedia broadcasting business data flow can high efficiency of transmission.
Below in conjunction with accompanying drawing and a plurality of embodiment technique scheme of the present invention is elaborated.
Main design of the present invention is to add separator at the afterbody of video-frequency band, audio section and the data segment of multiplexed sub frame respectively, sees first separator of video-frequency band afterbody among Fig. 2, is used for video-frequency band and audio section are separated; Second separator of audio section afterbody is used for audio section and data segment are separated; The 3rd separator of data segment afterbody is used to carry out the separation between multiplexed sub frame.Such multiplexed frame structure can utilize the multiplexed frame initial code to realize the synchronous of multiplexed frame, to indicate the beginning of each multiplexed frame; Equally, utilize the 3rd separator can realize multiplexed sub frame synchronously, with the end of indicating a multiplexed sub frame and the beginning of next multiplexed sub frame; Utilize first separator to realize the synchronizing traffic data of video-frequency band, with the end of instruction video section and the beginning of audio section; Utilize second separator to realize the synchronizing traffic data of audio section, with the end of indicative audio section and the beginning of data segment; Utilize the end that the 3rd separator both can the designation data section, also indicate the end of multiplexed sub frame and the beginning of next multiplexed sub frame simultaneously.
Embodiment one, and the method for synchronous of business data flow in a kind of mobile multimedia broadcast system may further comprise the steps:
Step 1: when generating multiplexed frame, add first separator at multiplexed sub frame video-frequency band afterbody according to the multiplexed frame structure of Mobile Multimedia Broadcasting standard definition; Afterbody at the multiplexed sub frame audio section adds second separator; Afterbody at the multiplexed sub frame data segment adds the 3rd separator;
Wherein, utilize first separator to come the end of instruction video section and the beginning of audio section, thereby realize the synchronizing traffic data of video-frequency band; Utilize the end of the second separator indicative audio section and the beginning of data segment, thereby realize the synchronizing traffic data of audio section; Utilize the end that the 3rd separator both can the designation data section, also indicate the end of a multiplexed sub frame and the beginning of next multiplexed sub frame simultaneously.
At this, first separator, second separator and the 3rd separator can according to circumstances only use wherein a kind of, also can according to circumstances these three kinds be used in combination.For example, only there are video-frequency band and audio section in the multiplexed frame, so, only use first separator and second separator to get final product.Again for example, have video-frequency band, audio section and data segment in the multiplexed frame, and wherein the data volume of audio section seldom, adapted second separator not then.In a word, first separator, second separator and the 3rd separator can be selected adapted according to the particular content of multi-media broadcasting service in the multiplexed frame.
Step 2: in order to keep the compatibility with existing mobile multimedia broadcast system, the length with first separator is not included in the video paragraph header respectively, and is included in the indicated video-frequency band length of multiplexed sub frame head; Equally, the length with second separator is included in the indicated audio section length of multiplexed sub frame head; The length of the 3rd separator is included in the indicated data segment, length of multiplexed sub frame head;
In order to keep the compatibility with existing mobile multimedia broadcast system, the length of first separator is not included in the video paragraph header, and is included in the indicated video-frequency band length of multiplexed sub frame head; The length of second separator is not included in the audio frequency paragraph header, and is included in the indicated audio section length of multiplexed sub frame head; The length of the 3rd separator is not included in the data segment header, and is included in the indicated data segment, length of multiplexed sub frame head.
Step 3: can but be not necessary, in multiplexed frame or control information table, the separation designator is set, have first separator, second separator and the 3rd separator in order to be illustrated in this multiplexed frame;
Step 4: send the multiplexed frame that generates, when Mobile Multimedia Broadcasting generation error of transmission, receiving terminal correctly extracts business data flows such as video, audio frequency according to above-mentioned separator, handles for the fault-tolerant software of video, audio frequency, thereby realizes wrong the isolation.
Embodiment two is on the basis of the foregoing description, and various separators are specifically realized with corresponding media units (video, audio frequency and data cell).
The method for synchronous of business data flow in a kind of mobile multimedia broadcast system may further comprise the steps:
Step 1: when generating multiplexed frame, add first separator at multiplexed sub frame video-frequency band afterbody according to the multiplexed frame structure of Mobile Multimedia Broadcasting standard definition; Afterbody at the multiplexed sub frame audio section adds second separator; Afterbody at the multiplexed sub frame data segment adds the 3rd separator;
Wherein, first separator, second separator and the 3rd separator can according to circumstances only use wherein a kind of, also can according to circumstances these three kinds be used in combination.
Step 2: in order to keep the compatibility with existing mobile multimedia broadcast system, the video unit that can further first separator be defined as specific type (promptly identifies it with special separator identifier and had both belonged to the special video cell type, conformance with standard is different from general video unit again to the requirement of video unit); The audio unit that second separator is defined as specific type (promptly identifies it with special separator identifier and had both belonged to the special audio cell type, conformance with standard is to the requirement of audio unit, be different from general audio unit again), the data cell that the 3rd separator is defined as specific type (promptly identifies it with special separator identifier and had both belonged to the special data cell type, conformance with standard is different from the general data unit again to the requirement of data unit); Regulation encapsulation according to the mobile multimedia broadcasting multiplex frame structure comprises the video unit of first separator, the data cell that comprises the audio unit of second separator and comprise the 3rd separator then;
Step 3: can but be not necessary, in this multiplexed frame or control information table, the separation designator is set, be illustrated in this multiplexed frame and have first separator, second separator and the 3rd separator;
Step 4: send the multiplexed frame that generates, when Mobile Multimedia Broadcasting generation error of transmission, receiving terminal correctly extracts business data flows such as video, audio frequency according to above-mentioned separator, handles for the fault-tolerant software of video, audio frequency.
Present embodiment three is on the basis of the foregoing description, and the various separators media multiplexing piece more tiny than media units (video, audio frequency and data multiplex piece) realized.
The method for synchronous of business data flow in a kind of mobile multimedia broadcast system may further comprise the steps:
Step 1: the multiplexed frame structure according to the Mobile Multimedia Broadcasting standard definition adds first separator at multiplexed sub frame video-frequency band afterbody; Afterbody at the multiplexed sub frame audio section adds second separator; Afterbody at the multiplexed sub frame data segment adds the 3rd separator;
Wherein, first separator, second separator, the 3rd separator may be used alone, can also be used in combination;
Step 2: in order to keep the compatibility with existing mobile multimedia broadcast system, multiplexing that can further first separator be defined as specific type (at this, can go out it with multiplexing type identification is multiplexing that separator is made in special use, is different to be used for video, audio frequency, data multiplexing piece); Second separator is defined as multiplexing of specific type, the 3rd separator is defined as multiplexing of specific type; Then according to the regulation of mobile multimedia broadcasting multiplex frame structure, multiplexing that will comprise first separator is encapsulated in the video unit, multiplexing that will comprise second separator is encapsulated in the audio unit, and multiplexing that will comprise the 3rd separator is encapsulated in the data cell.
Step 3: can but be not necessary, in this multiplexed frame or control information table, the separation designator is set, be illustrated in this multiplexed frame and have first separator, second separator and the 3rd separator;
Step 4: send the multiplexed frame that generates, when Mobile Multimedia Broadcasting generation error of transmission, receiving terminal correctly extracts business data flows such as video, audio frequency according to above-mentioned separator, handles for the fault-tolerant software of video, audio frequency.
The present invention introduces the multiplexed frame structure of separator in multiplexed sub frame, both can realize the synchronous of multiplexed frame, can realize the synchronous of each multiplexed sub frame and video-frequency band thereof, audio section and data segment again.Thereby, when the error of transmission of wireless broadcast network takes place, correctly extract business data flows such as video, audio frequency by the data sync of each several part, handle for fault-tolerant software, realization is to the timely isolation of mistake, thereby mobile multi-media broadcast service data stream is transmitted efficiently.
Certainly; the present invention also can have other multiple enforcements; 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 be according to the present invention; make various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (14)
1, the method for synchronous of business data flow in a kind of mobile multimedia broadcast system, it comprises the steps:
When (a) generating multiplexed frame, add separator and encapsulate at the media segment afterbody of the multiplexed sub frame of described multiplexed frame;
(b) the described multiplexed frame that send to generate, when described Mobile Multimedia Broadcasting generation error of transmission, receiving terminal is according to the correct business data flow that extracts described media segment of described separator, to carry out fault-tolerant processing.
According to the method for synchronous of the described business data flow of claim 1, it is characterized in that 2, step (a) also is included in the length that comprises described separator in the length of described media segment of described multiplexed sub frame head indication.
3, according to the method for synchronous of the described business data flow of claim 2, it is characterized in that, described media segment comprises one or more in video-frequency band, audio section and the data segment, and the afterbody of the one or more media segments that comprise at described multiplexed sub frame is inserted with corresponding separator.
According to the method for synchronous of claim 1 or 2 described business data flows, it is characterized in that 4, step (b) also is included in and is provided for the separation designator of representing whether described separator exists in the described multiplexed frame.
According to the method for synchronous of the described business data flow of claim 4, it is characterized in that 5, described separation designator is arranged in the control information table of described multiplexed frame.
According to the method for synchronous of the described business data flow of claim 3, it is characterized in that 6, described separator comprises one or more in first separator, second separator and the 3rd separator; Wherein:
Described first separator of step (a) is added in the afterbody of described video-frequency band, and the length of described first separator is included in the length of the described video-frequency band in the described multiplexed sub frame head; Described second separator is added in described audio section afterbody, and the length of described second separator is included in the length of the described audio section in the described multiplexed sub frame head; Described the 3rd separator is added in the afterbody of described data segment; And the length of described the 3rd separator is included in the length of the described data segment in the described multiplexed sub frame head;
The described receiving terminal of step (b) judges that according to described first separator data flow of described video-frequency band finishes, and begins to extract the data flow of media segment thereafter or next multiplexed sub frame; Or separate to judge that according to described second the data flow of described audio section finishes, the data flow of media segment thereafter or next multiplexed sub frame is correctly extracted in beginning; Or judge that the data flow of described data segment finishes, the correct business data flow that extracts next multiplexed sub frame of beginning according to described the 3rd separator.
7, according to the method for synchronous of the described data flow of claim 6, it is characterized in that, the described encapsulation of step (a) comprises: the regulation according to described multiplexed frame form is pressed the encapsulation of video unit form with described first separator, described second separator is pressed the encapsulation of audio unit form, described the 3rd separator is encapsulated by the data cell form.
8, according to the method for synchronous of the described data flow of claim 6, it is characterized in that, the described encapsulation of step (a) comprises: the regulation according to described multiplexed frame form is encapsulated in described first separator in the video unit by the video multiplex block format, described second separator is encapsulated in the audio unit by the audio-frequency multiplex block format, described the 3rd separator is encapsulated in the data cell by the data multiplex block format.
9, the multiplexing frame generating method of business data flow in a kind of mobile multimedia broadcast system comprises step: the media segment afterbody at the multiplexed sub frame of described multiplexed frame adds separator, and encapsulates.
10, according to the described multiplexing frame generating method of claim 9, it is characterized in that, also comprise step: the length that in the length of the described media segment that described multiplexed sub frame head is indicated, comprises described separator.
11, according to the described multiplexing frame generating method of claim 10, it is characterized in that, described media segment comprises one or more in video-frequency band, audio section and the data segment, and described method is inserted with corresponding separator at the afterbody of one or more media segments that described multiplexed sub frame comprises.
According to the described multiplexing frame generating method of claim 11, it is characterized in that 12, described separator comprises one or more in first separator, second separator and the 3rd separator; Wherein:
Described first separator is added in the afterbody of described video-frequency band, and the length of described first separator is included in the length of the described video-frequency band in the described multiplexed sub frame head; Described second separator is added in described audio section afterbody, and the length of described second separator is included in the length of the described audio section in the described multiplexed sub frame head; Described the 3rd separator is added in the afterbody of described data segment; And the length of described the 3rd separator is included in the length of the described data segment in the described multiplexed sub frame head.
13, according to the described multiplexing frame generating method of claim 12, it is characterized in that, described encapsulation comprises: the regulation according to described multiplexed frame form is pressed the encapsulation of video unit form with described first separator, described second separator is pressed the encapsulation of audio unit form, described the 3rd separator is encapsulated by the data cell form.
14, according to the described multiplexing frame generating method of claim 12, it is characterized in that, described encapsulation comprises: the regulation according to described multiplexed frame form is encapsulated in described first separator in the video unit by the video multiplex block format, described second separator is encapsulated in the audio unit by the audio-frequency multiplex block format, described the 3rd separator is encapsulated in the data cell by the data multiplex block format.
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| CNB2007101431565A CN100568981C (en) | 2007-08-03 | 2007-08-03 | A kind of method of data synchronization of mobile multimedia broadcast system |
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| CNB2007101431565A CN100568981C (en) | 2007-08-03 | 2007-08-03 | A kind of method of data synchronization of mobile multimedia broadcast system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103051861A (en) * | 2013-01-25 | 2013-04-17 | 上海德思普微电子技术有限公司 | Data transmission method and device |
| CN107257326A (en) * | 2010-04-20 | 2017-10-17 | 三星电子株式会社 | For transmitting interface arrangement and method with receiving media data |
| CN108992923A (en) * | 2018-06-22 | 2018-12-14 | 腾讯科技（深圳）有限公司 | Resource allocation method and device, storage medium and electronic device |
| CN115396687A (en) * | 2022-08-25 | 2022-11-25 | 广州方硅信息技术有限公司 | Method, device, live broadcast system and equipment for processing service data in media resource |
-
2007
- 2007-08-03 CN CNB2007101431565A patent/CN100568981C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107257326A (en) * | 2010-04-20 | 2017-10-17 | 三星电子株式会社 | For transmitting interface arrangement and method with receiving media data |
| US10609106B2 (en) | 2010-04-20 | 2020-03-31 | Samsung Electronics Co., Ltd | Interface apparatus and method for transmitting and receiving media data |
| US11196786B2 (en) | 2010-04-20 | 2021-12-07 | Samsung Electronics Co., Ltd | Interface apparatus and method for transmitting and receiving media data |
| US11621984B2 (en) | 2010-04-20 | 2023-04-04 | Samsung Electronics Co., Ltd | Interface apparatus and method for transmitting and receiving media data |
| CN103051861A (en) * | 2013-01-25 | 2013-04-17 | 上海德思普微电子技术有限公司 | Data transmission method and device |
| CN103051861B (en) * | 2013-01-25 | 2016-08-03 | 上海德思普微电子技术有限公司 | A kind of data transmission method and device |
| CN108992923A (en) * | 2018-06-22 | 2018-12-14 | 腾讯科技（深圳）有限公司 | Resource allocation method and device, storage medium and electronic device |
| CN108992923B (en) * | 2018-06-22 | 2019-09-13 | 腾讯科技（深圳）有限公司 | Resource allocation method and device, storage medium and electronic device |
| CN115396687A (en) * | 2022-08-25 | 2022-11-25 | 广州方硅信息技术有限公司 | Method, device, live broadcast system and equipment for processing service data in media resource |
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