CN105763889B - A kind of method for supporting content of multimedia hierarchical transmission - Google Patents
A kind of method for supporting content of multimedia hierarchical transmission Download PDFInfo
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- CN105763889B CN105763889B CN201410820905.3A CN201410820905A CN105763889B CN 105763889 B CN105763889 B CN 105763889B CN 201410820905 A CN201410820905 A CN 201410820905A CN 105763889 B CN105763889 B CN 105763889B
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Abstract
The present invention provides a kind of method for supporting content of multimedia hierarchical transmission, same multimedia transmitting stream is split into different pieces of information bag by the method, and is transmitted in the physical layer pipe for being respectively mapped to have different attribute.Because the specific different physical attribute of different physical layer pipes, such as different robustness, so as to fulfill the differential transmission of different content.For example important content is transmitted by high robust pipeline, ensure the high quality and stability of program.So as to be different service, differential charge etc. provides possibility.
Description
Technical field
The present invention relates to multimedia content deliveries technology, and in particular, to a kind of content of multimedia hierarchical transmission supported
Method.
Background technology
MPEG-2TS (MPEG-2Transport Stream, ISO/IEC 13818-1) is widely used in broadcast transmission,
As shown in Figure 1.Multiple programs are encapsulated in a MPEG-2TS, wherein PAT (Program Association Table) table
Give No. PID of each program its corresponding PMT (Program Map Table) table.Pmt table lists the member of each program
Element, such as the audio content included, video content, data etc., and provides and carries No. PID of each content element.User from
And it is known that the PID bags for accessing and being read required for some program.
In traditional digital broadcasting, a TS passes through a Broadcast physical channel transfer.
But with the development of technology, broadcast physical layer can provide multiple physical layer pipes (Physical Layer
Pipe, PLP), each physical layer pipe can possess different attributes, such as different robustness.This is just differential transmission
Provide possibility.
How to combine physical layer this new attribute, realize the hierarchical transmission of content of multimedia, be exactly the invention solves
The problem of.
The content of the invention
For in the prior art the defects of, the object of the present invention is to provide a kind of side for supporting content of multimedia hierarchical transmission
Method so that a MPEG-2TS streams can be split, and different media elements can transmit in different physical layer pipes, so that
Solves the problems, such as the differential transmission of different content.
To achieve the above object, the present invention provides a kind of method for supporting content of multimedia hierarchical transmission, and this method will be same
One multimedia transmitting stream splits into different pieces of information bag, and is passed in the physical layer pipe for being respectively mapped to have different attribute
It is defeated.
Preferably, the multimedia transmitting stream flows for MPEG-2TS.
Further, a MPEG-2TS streams are split into different pieces of information bag, in accordance with the following methods any progress：
1. in a system, there is two MPEG-2TS stream, respectively by original_netowrk_id=1,
Transport_stream_id=1 and original_netowrk_id=1, Transport_stream_id=2 are identified；
2. when a TS streams are split into PID bags independent one by one, interior only No. PID of each bag, does not have
Original_network_id and transport_stream_id；
If 3. there are more than one TS streams to be split in a system, when a TS streams are inputted by a passage, point
Identified with one unduplicated No. stream_id.
It is transmitted, refers in the physical layer pipe for being respectively mapped to that there is different attribute：In one TS stream by
The different pieces of information bag of PID marks, some physical layer pipe being assigned in some logic channel in Different Logic channel group.Eventually
After termination receives, by parsing corresponding mapping relations, the programme content selected by it is obtained.
Compared with prior art, the present invention has following beneficial effect：
Technical scheme is employed, can be by the different content for the different programs being encapsulated in a MPEG-2TS
Element is disassembled, and is respectively mapped to be transmitted in different physical layer pipes.Because different physical layer pipes is specific different
Physical attribute, such as different robustness, so as to fulfill the differential transmission of different content.For example important content passes through height
Robustness pipeline transmits, and ensures the high quality and stability of program.So as to be different service, differential charge etc. provides can
Energy.
Brief description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the MPEG-2TS schematic diagrames for including multiple programs；
Fig. 2 is program map example schematic in one embodiment of the invention.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following embodiments will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Physical layer has multiple logic channel groups (Logical Channel Group, identified by LCG_id), each logic letter
Can having multiple logic channels in road group, (Logical Channel, are identified by LC_id, this LC_id is in some logic channel
It is unique in group), can have in each logic channel multiple physical layer pipes (Physical Layer Pipe, it is unique by PLP_id
Mark, this PLP_id are unique in some logic channel).
Each MPEG-2TS is by original_network_id and transport_stream_id come unique mark.One
A program can contain multiple content elements, each element is encapsulated in the different bags of TS streams, each TS data packet exists
By PID unique marks in this TS streams.
In order to realize differential transmission, it is necessary to different program elements is assigned in different physical layer pipes.Fig. 2 is
One example.In this example：
1. in a system, there is two MPEG-2TS stream, respectively by original_netowrk_id=1,
Transport_stream_id=1 and original_netowrk_id=1, Transport_stream_id=2 are identified.
2. when a TS streams are split into PID bags independent one by one, interior only No. PID of each bag, does not have
Original_network_id and transport_stream_id.If there is more than one TS streams to be split in a system,
Which TS stream each PID of user terminal None- identified comes from earth.For this reason, when a TS streams are inputted by a passage,
One unduplicated No. stream_id is distributed to identify.PID bags i.e. from same TS streams, replace sync byte 0x47
For No. stream_id.
3. the different pieces of information bag (being identified by PID) in a TS streams, can be assigned to some in Different Logic channel group
Some management level pipeline PLP in logic channel, its mapping relations are as follows：
Different data packets in one TS stream, which can be assigned in different physical layer pipes, to be transmitted, i.e. which TS
Which physics is data packet be assigned to (by original_network_id, transport_stream_id, PID unique marks)
Layer pipeline (by LCG_id, LC_id, PLP_id) transmission, is exactly the mapping relations between them.Only closed based on this mapping
The TS data packets for being split to different physical layer pipe transmission could be properly received and recovered by system, receiving terminal.And due to
Do not have inside TS data packets and do not contain original_network_id, transport_stream_id, so needing newly to determine
One stream_id of justice flows to identify each TS, it can be placed in each data packet, substitution sync byte 0x47.
In order to find the management level pipeline PLP where each content element of program, invention defines CAI
(Content Access Information), provides each data packet and the mapping relations of management level pipeline PLP in TS streams, i.e.,
Any data bag (by original_network_id, transport_stream_id, PID unique marks) is allocated in TS streams
Transmitted to which physical layer pipe (by LCG_id, LC_id, PLP_id), while give the streams of the TS belonging to each data packet
Stream_id：
Descriptor_tag, identifies this descriptor and describes CAI information；
Descriptor_length, gives the length of this descriptor；
Original_network_id, provides the source network id for identifying this MPEG-2TS streams；
Transport_stream_id, gives the TS id for identifying this MPEG-2TS streams；
Stream_id, gives the passage stream id for distributing to this MPEG-2TS streams, this stream_id will substitute each
Sync byte 0x47 in TS data packets, for identifying all PID bags from same TS；
PID, identifies a TS data packet, it will be assigned in some management level pipeline PLP and be transmitted；
LCG_id, the mark id of logic channel group；
LC_id, the mark id of logic channel；
PLP_id, the mark id of physical layer pipe；
Each PID bag that this table is just given in a TS streams is mapped to the specifying information of physical layer pipe PLP.
CAI can be used as a descriptor (descriptor), be placed on NIT (network_information_table)
In be transmitted.An information table can also be independently generated, is placed in some PID bag and is transmitted.
No matter CAI information be placed on where, for terminal, after it receives broadcast singal, parse corresponding TS stream
Information table, by PAT, pmt table, have selected corresponding program, and know the content element of selected program, and knows and hold
Carry No. PID of the bag of each content element.At this moment, it is necessary to CAI is found, so as to know the PID bags for carrying each content element
It is mapped to what is be transmitted on which management level pipeline PLP.So as to receiving corresponding PID on corresponding management level pipeline PLP
Bag.In this way, terminal can be obtained by the programme content selected by it.
In the present invention by taking TS flows as an example, other transport layer protocols are in application, similar approach is equally applicable.
The specific embodiment of the present invention is 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 (7)
- A kind of 1. method for supporting content of multimedia hierarchical transmission, it is characterised in that the method transmits same multimedia Stream splits into different pieces of information bag, and is transmitted in the physical layer pipe for being respectively mapped to have different attribute.
- 2. the method according to claim 1 for supporting content of multimedia hierarchical transmission, it is characterised in that the multimedia passes Stream is sent to be flowed for MPEG-2TS.
- 3. the method according to claim 2 for supporting content of multimedia hierarchical transmission, it is characterised in that by a MPEG- 2TS streams split into different pieces of information bag, in accordance with the following methods any progress：1. in a system, there are two MPEG-2TS streams, respectively by original_netowrk_id=1, Transport_ Stream_id=1 and original_netowrk_id=1, Transport_stream_id=2 are identified；2. when a TS streams are split into PID bags independent one by one, each bag is interior to only have No. PID, without original_ Network_id and transport_stream_id；If 3. there are more than one TS streams to be split in a system, and when a TS streams are inputted by a passage, distribution one A unduplicated No. stream_id identifies.
- 4. the method according to claim 2 for supporting content of multimedia hierarchical transmission, it is characterised in that described to map respectively It is transmitted, refers into the physical layer pipe with different attribute：The different pieces of information bag identified by PID in one TS stream, Some physical layer pipe being assigned in some logic channel in Different Logic channel group, its mapping relations are as follows：Physical layer has multiple logic channel groups, is identified by LCG_id；There are multiple logic channels by LC_id in each logic channel group Mark, this LC_id are unique in some logic channel group；There can be multiple physical layer pipes in each logic channel, by PLP_id unique marks, this PLP_id are unique in some logic channel；Each MPEG-2TS streams by original_network_id and transport_stream_id come unique mark, one Program contains multiple content elements, each element is encapsulated in the different bags of TS streams, each TS data packet is in this TS By PID unique marks in stream；Different allocation of packets in one TS stream are transmitted into different physical layer pipes, i.e., by PID unique marks Which TS data packet be assigned to by LCG_id, LC_id, which physical layer pipe transmission of PLP_id unique marks, is exactly Mapping relations between them, only based on this mapping relations, receiving terminal could will be split to different physical layer pipe transmission TS data packets be properly received and recover, and TS stream original_network_id, transport_stream_ Id is included in its signaling information, the identification information in each media data packet not necessarily all containing this TS streams, when in TS streams Data packet, which is split, to be assigned to when transmitted in different physical layer pipes, just can not know which TS is these data packets come from Stream, so needing newly to define a stream_id to identify each TS streams, it is placed in each data packet, substitutes synchronization character 0x47 is saved, can so know which TS stream is these data packets come from, the data packet of fractionation can also be restored original TS stream in.
- 5. the method for content of multimedia hierarchical transmission is supported according to claim 2-4 any one of them, it is characterised in that in order to The physical layer pipe where each content element of program can be found, defines CAI, provides each data packet and thing in TS streams The mapping relations of layer pipeline are managed, i.e. TS is unique by original_network_id, transport_stream_id, PID in flowing Any data coating of mark is assigned to be transmitted by LCG_id, LC_id, which physical layer pipe of PLP_id unique marks, together When give belonging to each data packet TS stream stream_id：Descriptor_tag, identifies this descriptor and describes CAI information；Descriptor_length, gives the length of this descriptor；Original_network_id, provides the source network id for identifying this MPEG-2TS streams；Transport_stream_id, gives the TS id for identifying this MPEG-2T streams S；Stream_id, give distribute to this MPEG-2TS stream passage stream id, this stream_id will substitute each TS bags In sync byte 0x47, for identify from same TS stream all PID bags；PID, identifies a TS data packet, it will be assigned in some physical layer pipe PLP and be transmitted；LCG_id, the mark id of logic channel group；LC_id, the mark id of logic channel；PLP_id, the mark id of physical layer pipe；Each PID bag that this table is just given in a TS streams is mapped to the specifying information of physical layer pipe PLP.
- 6. the method according to claim 5 for supporting content of multimedia hierarchical transmission, it is characterised in that CAI is as one Descriptor, is placed in NIT and is transmitted；Or CAI independently generates an information table, it is placed in some PID bag and is transmitted.
- 7. the method according to claim 6 for supporting content of multimedia hierarchical transmission, it is characterised in that terminal receives extensively After broadcasting signal, the information table of corresponding TS streams is parsed, by PAT, pmt table, have selected corresponding program, and know selected Program content element, and know No. PID of the bag for carrying each content element, at this moment find CAI, so as to know that carrying is every The PID bags of a content element are mapped to what is be transmitted on which management level pipeline PLP, so as to arrive corresponding management level pipeline Corresponding PID bags are received on PLP, such terminal just obtains the programme content selected by it.
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Effective date of registration: 20230913 Address after: 200125 Room 701, Block B, No. 1018 East Sanliqiao Road, Pudong New Area, Shanghai Patentee after: SHANGHAI NATIONAL ENGINEERING RESEARCH CENTER OF DIGITAL TELEVISION Co.,Ltd. Address before: 200240 No. 800, Dongchuan Road, Shanghai, Minhang District Patentee before: SHANGHAI JIAO TONG University |