CN108306848A - A kind of data packet length identification method based on media encapsulation format - Google Patents
A kind of data packet length identification method based on media encapsulation format Download PDFInfo
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- CN108306848A CN108306848A CN201710027491.2A CN201710027491A CN108306848A CN 108306848 A CN108306848 A CN 108306848A CN 201710027491 A CN201710027491 A CN 201710027491A CN 108306848 A CN108306848 A CN 108306848A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
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Abstract
The present invention provides a kind of data packet length identification methods based on media encapsulation format, including：Define field o, the length for identifying the data packet since terminating field o；Field a is defined, whether be used to indicate in data packet includes multiple loads；Based on field a：If only including single load in data packet, payload length is not indicated；If in data packet including multiple loads, increases field b in the data segment where each load, define field b, be used to indicate payload length in the data segment；Increase field c, defines field c, be used to indicate each field b length.The present invention is by increasing description field and corresponding indication field to data packet and payload length in data encapsulating structure, accurate description multi-medium data encapsulates the size with each load data in encapsulating structure, convenient for the decapsulation and reading of multi-medium data, time and the wasting of resources caused by it can not obtain media package size are reduced.
Description
Technical field
The present invention relates to media encapsulation format technical field, especially a kind of data packet length based on media encapsulation format
Identification method, more specifically, being related to that a kind of supported in media encapsulation format can cutting be single or logarithm when integrating multiple objects
The method being identified according to packet length.
Background technology
With the development of Digital object identifier and internet, especially high-quality video business push forward comprehensively and net
The continuous promotion of network bandwidth, user have experienced better digital media service.In addition, technology also produces one while development
The media encapsulation format and transmission standard of series.Rational data packet structure also can more effectively utilize net with transformat
Network resource, optimization data decapsulate flow, promote the promotion of user experience.
Current most of media protocols both define complete data packet structure, which includes data packet length or bear
The definition for carrying length, " PES_packet_length " instruction as defined in the common MPEG2-TS agreements of digital TV field
The length of PES；In broadband network common http protocol using defined in " transfer-coding " " chunked " or
It is to carry out designation date packet length using " Content-Length ".Most of media protocols describe data using similar method
Packet or the length individually loaded, there is no consider in an encapsulating structure comprising multiple loads.
On the other hand, the development of digital media technology meets the growing media consumption demand of user, media resource
Between content association also be media resource integration provide the foundation.Nowadays it can be enjoyed in heterogeneous networks relatively high
Thus new problem has also been introduced in the multimedia service of quality, due to causing without the difference of network different agreement encapsulating structure
User can only enjoy a certain business the same time, and can not enjoy the more extensive and higher-quality media that heterogeneous network is brought
Service does not meet the development trend of Digital Media " at any time, everywhere, any terminal, any content ".
It decapsulates and considers from data, rational data encapsulating structure can make client fast and accurately know that data are retouched
Information is stated to improve decapsulation efficiency, and the offer of personalized service is provided.
How each payload length is retouched when not considering more than existing media transmission protocol in a data packet comprising multiple loads
The problem of stating also not yet is collected into money similar both at home and abroad currently without the explanation or report for finding technology similar to the present invention
Material.
Invention content
Aiming at the above shortcomings existing in the prior art, the object of the present invention is to provide a kind of based on media encapsulation format
Data packet length identification method, by defining description of the field realization to each payload length before each load, in addition,
Effectively using each field in media encapsulation format, the production of redundant data is avoided by the way that corresponding mark bit field is arranged
It is raw.
To achieve the above object, the present invention is achieved by the following technical solutions.
A kind of data packet length identification method based on media encapsulation format, includes the following steps：
Define field o, the length for identifying the data packet since terminating field o；
Field a is defined, whether be used to indicate in data packet includes multiple loads；
Based on field a：
If only including single load in data packet, payload length is not indicated；
If in data packet including multiple loads, increase field b, defined word in the data segment where each load
Section b, is used to indicate payload length in the data segment；Increase field c, defines field c, be used to indicate each field b length.
Preferably, the field a includes two mode bits, when field a sets mode bit 1, is indicated in data packet comprising more
A load；When field a sets mode bit 0, indicate only to include 1 load in data packet.
Preferably, the field c is using following any structure：
The first structure, the field c increases in the data segment where each load, and is used to indicate the data
Field b length in section；
- second structure, the field c increases except the data segment where load, including multiple data bit, wherein often
One data bit is for the corresponding field b length indicated in each data segment.
Preferably, under the first structure, the field b is identical as load number as the presentation number of field c；Second
Under kind structure, the presentation number of the field b is identical as load number, the data bit number of field c and the presentation number of field b
It is identical.
Preferably, in the case of only including single load in the packet, the field a is set to after field o, described
Load is set to after field a；
In the case of including multiple loads in the packet, when the structure of field c is the data segment where being set to load
When middle, after the field a is set to field o, the data segment where loading is set gradually since field a；In each data
Duan Zhong, field c, field b and load are set gradually from front to back；
In the case of including multiple loads in the packet, when the structure of field c is the data segment where being set to load
When outer, after the field a is set to field o, field c is set to after field a, and the data segment where loading is since field c
It sets gradually；In each data segment, field b and load are set gradually from front to back；The data bit of the field c with it is each
Field b in a data segment is corresponded.
Preferably, the field o is defined at encapsulating structure beginning.
Compared with prior art, the present invention has the advantages that：
1, a kind of data packet length identification method based on media encapsulation format provided by the invention is increased when a number
According to, there are packet length and the payload length indicating means when multiple loads, improving decapsulation efficiency in packet.
2, technical solution using the present invention, by increasing saying to data packet and payload length in data encapsulating structure
Bright field and corresponding indication field, can with accurate description multi-medium data encapsulate in encapsulating structure each load data it is big
It is small, it is convenient for the decapsulation and reading of multi-medium data, reduces time and the wasting of resources because media package size sum can not be obtained,
Better service experience is brought to user.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is length mark schematic diagram in data encapsulation in the embodiment of the present invention 1；
Length mark schematic diagram in data encapsulation in the positions Fig. 2 embodiment of the present invention 2；
Fig. 3 is application one schematic diagram of the data packet length identification method of the present invention in MMT；
Fig. 4 is application two schematic diagram of the data packet length identification method of the present invention in MMT.
Specific implementation mode
It elaborates below to the embodiment of the present invention：The present embodiment is carried out lower based on the technical solution of the present invention
Implement, gives detailed embodiment and specific operating process.It should be pointed out that those skilled in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.
Embodiment 1
A kind of data packet length identification method based on media encapsulation format is present embodiments provided, is included the following steps：
Define field o, the length for identifying the data packet since terminating field o；
Field a is defined, whether be used to indicate in data packet includes multiple loads；
Based on field a：
If only including single load in data packet, payload length is not indicated；
If in data packet including multiple loads, increase field b, defined word in the data segment where each load
Section b, is used to indicate payload length in the data segment；Increase field c, defines field c, be used to indicate each field b length.
Further, the field a includes two mode bits, when field a sets mode bit 1, includes in expression data packet
Multiple loads；When field a sets mode bit 0, indicate only to include 1 load in data packet.
Further, the field c uses such as lower structure：
The first structure, the field c increases in the data segment where each load, and is used to indicate the data
Field b length in section.
Further, under the first structure, the field b is identical as load number as the presentation number of field c.
Further, in the case of only including single load in the packet, the field a is set to after field o, institute
Load is stated to be set to after field a；
Further, in the case of including multiple loads in the packet, where the structure of field c is to be set to load
Data segment in when, after the field a is set to field o, load where data segment set gradually since field a；Every
In one data segment, field c, field b and load are set gradually from front to back.
Further, the field o is defined at encapsulating structure beginning.
The present embodiment is further illustrated below in conjunction with the accompanying drawings.
Data packet length identification method provided in this embodiment based on media encapsulation format, includes the following steps：
Field 1 (field o), the length for identifying the data packet since terminating the field 1 are defined at encapsulating structure beginning
Degree；
Field 2 is arranged after field 1, and (field a) defines field 2, is used to indicate whether data packet includes multiple loads；Word
Two mode bits (1 and 0) of section 2 indicate that data packet includes multiple loads with data packet only comprising a load respectively.
Field 3 is defined before load, and (field b) is used to indicate the length of the load；
Field 4 is defined before field 3, and (field c) is used to indicate the length of field 3.
When field 2 sets mode bit 1, data packet includes multiple loads, and field 3, field 4 is presented for describing each load
Length；When field sets mode bit 0, data packet only includes a load, and field 3, field 4 are not presented.
As shown in Figure 1, defining the data packet field 1 is used to indicate from the field terminates at encapsulating structure beginning
Length.
Field 2 is set after field 1, defines field 2, is used to indicate whether data packet includes multiple loads；Field 2 is set to 0
When, it includes a load to indicate the data packet only；When field 2 sets 1, indicate that the data packet includes multiple loads；
Field 4 is defined after field 2, is used to indicate the length of field 3；
Field 3 is defined after field 4, is used to indicate the length of load；
As shown in Figure 1, when field 2 sets 1, it is identical as number is loaded that number is presented in field 3, field 4.Wherein data segment 1
In 4 designation date section 1 of field in field 3 length, the length loaded in the 3 designation date section 1 of field in data segment 1；
The length of the field 3 in 4 designation date section N of field in data segment N loads in the 3 designation date section N of field in data segment N
Length.
Field description word and position in Fig. 1 only make signal effect, are not set form, illustrate hereby.
Embodiment 2
Embodiment 2 is the change case of embodiment 1.
The present embodiment on the basis of embodiment 1, with embodiment 1 difference lies in：
The field c uses such as lower structure：
- second structure, the field c increases except the data segment where load, including multiple data bit, wherein often
One data bit is for the corresponding field b length indicated in each data segment.
Further, under second of structure, the presentation number of the field b is identical as load number, the data of field c
Position number is identical as the presentation number of field b.
Further, in the case of including multiple loads in the packet, where the structure of field c is to be set to load
Data segment outside when, after the field a is set to field o, field c is set to after field a, and the data segment where loading is from word
Section c starts to set gradually；In each data segment, field b and load are set gradually from front to back；The data of the field c
Position is corresponded with the field b in each data segment.
The present embodiment is further described below in conjunction with the accompanying drawings.
Data packet length identification method provided in this embodiment based on media encapsulation format, includes the following steps：
Field 1 (field o), the length for identifying the data packet since terminating the field 1 are defined at encapsulating structure beginning
Degree；
Field 2 is arranged after field 1, and (field a) defines field 2, is used to indicate whether data packet includes multiple loads；Word
Two mode bits (1 and 0) of section 2 indicate that data packet includes multiple loads with data packet only comprising a load respectively.
Field 3 is defined before load, and (field b) is used to indicate the length of the load；
Field 4 is defined after field 2, and (field c) is used to indicate the length of field 3.
When field 2 sets mode bit 1, data packet includes multiple loads, and field 3, field 4 is presented for describing each load
Length；When field sets mode bit 0, data packet only includes a load, and field 3, field 4 are not presented.
As shown in Fig. 2, defining the data packet field 1 is used to indicate from the field terminates at encapsulating structure beginning
Length.
Field 2 is set after field 1, defines field 2, is used to indicate whether data packet includes multiple loads；Field 2 is set to 0
When, it includes a load to indicate the data packet only；When field 2 sets 1, indicate that the data packet includes multiple loads；
Field 4 is defined after field 2, is used to indicate the length of field 3；
Field 3 is defined before load, is used to indicate the length of load；
As shown in Fig. 2, when field 2 sets 1, the presentation number of field 3 is identical as load number, the data bit position of field 4
Number is identical as the presentation number of field 3.The wherein length of the field 3 of the 1st designation date section 1 of field 4, in data segment 1
The length of load in 3 designation date section 1 of field；The wherein length of the field 3 of N designation date section N of field 4, data
The length of the load in 3 designation date section N of field in section N.
Field description word and position in Fig. 2 only make signal effect, are not set form, illustrate hereby.
The present embodiment is further illustrated with reference to concrete application.
Concrete application one
The present embodiment is not limited to MMT agreements by taking MMT transport protocols as an example.Long data packet designed by the present embodiment
Degree identifier mechanism is applicable to different media transmission protocols, has certain universality.
It is as follows to the explanation of field in Fig. 3：
length：Indicate the length of the data packet since terminating the field；
f_i：Indicate the fragment situation of signaling information in the packet load, virtual value is as shown in table 1, and table 1 gives letter
Enable the value of information fragment situation instruction information and corresponding operation.
Table 1
| Value | Description |
| 00 | Include one or more complete signaling informations in load |
| 01 | Include first segment of a signaling information in load |
| 10 | Include the intermediate segment of a signaling information in load |
| 11 | Include the last one segment of signaling information in load |
res：Reserved bit；
A：Indicate whether the data packet includes multiple loads；The data packet includes multiple loads when set, should when reset
Data packet only includes a load；
frag_counter：Indicate that the number of follow-up data packet, load belong to one completely with the packet load
Signaling information；
res：Reserved bit；
H：Indicate whether to need to describe payload length using 2 additional bytes；MSG_length length is when reset
2 bytes, MSG_length length is 4 bytes when set；
MSG_Length：Indicate the length loaded since terminating the field；
As shown in Figure 1, encapsulating structure beginning define field " length " (4 bytes) for identify from the field
End starts the length of the data packet；Subsequent " f_i " and " res " field is respectively identification load integrality and reserved field.
Field " A " set indicates that the encapsulating structure includes more than one signaling information, " H " field subsequent at this time and " MSG_
Length " fields are presented.Wherein, " H " field reset instruction " MSG_length " describes back " Data " with 2 bytes
Length, " H " field set instruction " S_Lenght " describe the length of " Data " below with 4 bytes；" MSG_length " is used
" Data " field length behind description.It includes a load that field " A " reset, which indicates the encapsulating structure only, at this time field " H "
It is not presented with field " MSG_length ".
Concrete application two
The present embodiment is not limited to MMT agreements by taking MMT transport protocols as an example.Long data packet designed by the present embodiment
Degree identifier mechanism is applicable to different media transmission protocols, has certain universality.
It is as follows to the explanation of field in Fig. 4：
length：Indicate the length of the data packet since terminating the field；
f_i：Indicate the fragment situation of signaling information in the packet load, virtual value is as shown in table 1, and table 1 gives letter
Enable the value of information fragment situation instruction information and corresponding operation.
Table 1
| Value | Description |
| 00 | Include one or more complete signaling informations in load |
| 01 | Include first segment of a signaling information in load |
| 10 | Include the intermediate segment of a signaling information in load |
| 11 | Include the last one segment of signaling information in load |
A：Indicate whether the data packet includes multiple loads；The data packet includes multiple loads when set, should when reset
Data packet only includes a load；
frag_counter：Indicate that the number of follow-up data packet, load belong to one completely with the packet load
Signaling information；
H：Indicate whether to need to describe payload length using 2 additional bytes；MSG_length length is when reset
2 bytes, MSG_length length is 4 bytes when set；
MSG_length：Indicate the length loaded since terminating the field, there are one MSG_ before each Data
Length fields；
As shown in Figure 1, encapsulating structure beginning define field " length " for identify since terminating the field
The length of the data packet；Subsequent " f_i " field identification loads integrality.Field " A " set indicates that the encapsulating structure includes
Multiple loads, " H " field subsequent at this time are presented with " MSG_length " field.Wherein, " H " field first position " 0 " indicates
First " MSG_length " describes the length of " Data " below, " H " field first position " 1 " instruction first with 2 bytes
A " MSG_length " describes the length of " Data " below with 4 bytes；" H " field nth position " 0 " indicates n-th " MSG_
Length " describes the length of " Data " below with 2 bytes, and " H " field nth position " 1 " indicates that N is each " MSG_length "
The length of " Data " below is described with 4 bytes.Field " A " reset, it includes a load to indicate the encapsulating structure only, this
When field " H " do not presented with field " MSG_length ".
Above-described embodiment in data encapsulating structure by increasing to the description field of data packet and payload length and corresponding
Indication field, the size of the encapsulation of accurate description multi-medium data and each load data in encapsulating structure, is convenient for multi-medium data
Decapsulation and reading, reduce time and the wasting of resources caused by it can not obtain media package size.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (6)
1. a kind of data packet length identification method based on media encapsulation format, which is characterized in that include the following steps：
Define field o, the length for identifying the data packet since terminating field o；
Field a is defined, whether be used to indicate in data packet includes multiple loads；
Based on field a：
If only including single load in data packet, payload length is not indicated；
If in data packet including multiple loads, increases field b in the data segment where each load, defines field b,
It is used to indicate payload length in the data segment；Increase field c, defines field c, be used to indicate each field b length.
2. the data packet length identification method according to claim 1 based on media encapsulation format, which is characterized in that described
Field a includes two mode bits, when field a sets mode bit 1, indicates to include multiple loads in data packet；When field a sets state
When position 0, indicate only to include 1 load in data packet.
3. the data packet length identification method according to claim 1 based on media encapsulation format, which is characterized in that described
Field c is using following any structure：
The first structure, the field c increases in the data segment where each load, and is used to indicate in the data segment
Field b length；
- second structure, the field c increases except the data segment where load, including multiple data bit, wherein each
Data bit is for the corresponding field b length indicated in each data segment.
4. the data packet length identification method according to claim 3 based on media encapsulation format, which is characterized in that
Under a kind of structure, the field b is identical as load number as the presentation number of field c；Under second of structure, the field b
Presentation number with load number it is identical, the data bit number of field c is identical as the presentation number of field b.
5. the data packet length identification method according to claim 3 based on media encapsulation format, which is characterized in that in number
In the case of in packet only including single load, the field a is set to after field o, the load be set to field a it
Afterwards；
In the case of including multiple loads in the packet, when in the data segment that the structure of field c is where being set to load,
After the field a is set to field o, the data segment where loading is set gradually since field a；In each data segment,
Field c, field b and load are set gradually from front to back；
In the case of including multiple loads in the packet, when the structure of field c is to be set to outside the data segment at load place,
After the field a is set to field o, field c is set to after field a, and the data segment where loading is set successively since field c
It sets；In each data segment, field b and load are set gradually from front to back；The data bit of the field c and each data
Field b in section is corresponded.
6. the data packet length identification method according to claim 1 based on media encapsulation format, which is characterized in that described
Field o is defined at encapsulating structure beginning.
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| CN111488171A (en) * | 2019-01-29 | 2020-08-04 | 杭州海康威视数字技术股份有限公司 | Data generation and analysis method and device and electronic equipment |
| CN114356827A (en) * | 2021-12-23 | 2022-04-15 | 海光信息技术股份有限公司 | Data analysis method, device, equipment and medium |
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| CN114356827B (en) * | 2021-12-23 | 2024-03-22 | 海光信息技术股份有限公司 | Data analysis method, device, equipment and medium |
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Application publication date: 20180720 |