CN114205135A - TS stream processing method and TS stream processing system of decryption device - Google Patents
TS stream processing method and TS stream processing system of decryption device Download PDFInfo
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- CN114205135A CN114205135A CN202111486347.8A CN202111486347A CN114205135A CN 114205135 A CN114205135 A CN 114205135A CN 202111486347 A CN202111486347 A CN 202111486347A CN 114205135 A CN114205135 A CN 114205135A
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- 238000012545 processing Methods 0.000 title claims abstract description 39
- 238000003672 processing method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000012634 fragment Substances 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 28
- 238000001914 filtration Methods 0.000 claims description 7
- 230000011218 segmentation Effects 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9057—Arrangements for supporting packet reassembly or resequencing
Abstract
The invention discloses a method for processing a TS (transport stream) by decryption equipment and a system for processing the TS. The method for processing the TS stream by the decryption device comprises the following steps: the sending equipment encapsulates the TS stream into segments and transmits the segments to the decryption equipment through a corresponding protocol; the decryption device receives the fragment and separates the protocol data of the fragment from TS stream data; the decryption device respectively processes the protocol data and the TS stream data, filters invalid TS packets in the TS stream data, and decrypts the valid TS packets; and the decryption equipment repackages the processed TS packet according to the protocol data and transmits the TS packet to the sending equipment through a corresponding protocol. The invention can prevent the decryption equipment from being suspended or having compatibility problems due to the phenomena of packet loss and the like, and improves the user experience.
Description
Technical Field
The present invention relates to the technical field of TS stream processing, and in particular, to a method and a system for processing a TS stream by a decryption device.
Background
The decryption device of the TS stream is used for receiving the TS stream from the host computer, carrying out decryption related processing, and then transmitting the TS stream to the host computer.
The existing decryption device of the TS stream generally performs data transmission with a host through a USB interface, the USB decryption device receives the TS stream from the host through a USB protocol, and after decryption processing, the processed stream is transmitted back to the host through the USB protocol. In current implementations the data received by the USB decryption device is exactly the same as the data sent back to the host. In an actual scenario, packet loss may occur in TS decryption processing, and the number of lost packets may not be known, which may cause the USB decryption device to suspend or restart erroneously, which may cause the data packet to be unable to be processed in that period, and seriously affect user experience. This is because decryption is responsible for by a module in the decryption device, and because the chip defect of this module can cause this chip to hang up and do not work when receiving the invalid packet, therefore can't decrypt, need to reset the chip and just can work again.
Disclosure of Invention
In order to solve the technical problem that the decryption device is suspended or compatible due to the packet loss problem of the TS in the transmission process of the decryption device in the prior art, the invention provides a method and a system for processing the TS by the decryption device.
The method for processing the TS stream by the decryption equipment provided by the invention comprises the following steps:
the sending equipment encapsulates the TS stream into segments and transmits the segments to the decryption equipment through a corresponding protocol;
the decryption device receives the fragment and separates the protocol data of the fragment from TS stream data;
the decryption device respectively processes the protocol data and the TS stream data, filters invalid TS packets in the TS stream data, and decrypts the valid TS packets;
and the decryption equipment repackages the processed TS packet according to the protocol data and transmits the TS packet to the sending equipment through a corresponding protocol.
Further, the decryption device decrypts the valid TS, and then performs at least one of descrambling and secondary encryption.
Further, the sending device and the decryption device transmit the segment of the TS stream through a USB protocol.
The processing system of TS stream that the invention proposes, including sending equipment and decipher the apparatus, the said sending equipment includes: a segmentation module for encapsulating the TS stream into segments, and a first transmission module for transmitting the segments to a decryption device through a corresponding protocol; the decryption apparatus includes: the second transmission module is used for communicating with the first transmission module through a corresponding protocol, the segment disassembling module is used for separating protocol data of the segment received by the second transmission module from TS stream data, the effective TS packet filtering module is used for screening invalid TS packets in the TS stream data and reserving effective TS packets, the TS packet processing module is used for decrypting the effective TS packets, and the segment assembling module is used for repackaging the processed TS packets output by the TS packet processing module according to the protocol data.
Further, the first transmission module and the second transmission module are USB modules.
Further, the TS packet processing module performs at least one of descrambling and secondary encryption on the decrypted TS packet.
The invention utilizes the characteristics of the TS stream to ensure that the decryption equipment continuously receives the TS stream from the sending equipment (host), repackages the processed TS and then sends the TS back to the sending equipment, thus leading the TS stream to lose part of packets during processing without influencing the decryption equipment to process other normal packets, reducing the compatibility problem caused by packet loss during processing of the TS stream and improving the user experience.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a block diagram of a system architecture according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The method for processing the TS stream by the decryption device of the invention requires that the sending device firstly encapsulates the TS stream into Fragments (Fragments), and then transmits the Fragments to the decryption device through a corresponding protocol.
After receiving the segment sent by the sending device, the decryption device separates the protocol data from the TS stream data in the segment, and the decryption device processes the protocol data and the TS stream data respectively, filters out invalid TS packets in the TS stream data, decrypts valid TS packets, and besides decrypting valid TS packets, the decryption device may perform other processing on TS packets, including but not limited to at least one of descrambling and secondary encryption.
And then the decryption device repackages the processed TS packet according to the protocol data and transmits the TS packet to the sending device through a corresponding protocol.
The repackaging of the invention is mainly based on the characteristics of TS stream, firstly separating the protocol data and the TS stream, filtering the invalid packet and correspondingly processing, and then recombining the protocol data and the TS stream. This way, it is avoided that the TS stream returned to the sending device is interrupted due to error processing (such as protocol renegotiation, resetting the decryption device, etc.) when packet loss occurs during decryption. According to the characteristics of the TS stream, on one hand, the method continuously receives the TS stream from the sending equipment, so that even if packet loss occurs, the TS packet received later can be filled and sent back.
The main reason for the separation in the above process is that decryption and encryption of TS streams are usually implemented by hardware modules in embedded devices, and the hardware modules usually only process pure TS stream data, and protocol data cannot be identified, and errors will occur when protocol data is sent together. The re-encapsulation is because the sending device (host) and the decryption device transmit TS stream data by a specific protocol, including a fragmentation method, a transmission protocol, and the like. The re-encapsulated data satisfies the particular protocol.
The filtering of the invalid packets is mainly judged by the fixed size characteristics of the TS packets 0x47 synchronous bytes and 188 bytes, and the method is high in speed and efficiency.
In one embodiment, the sending device acts as a host, and the segments of the TS stream are transmitted between the host and the decryption device via the USB protocol. Besides the USB protocol, the related data of the TS stream can be transmitted between the host and the decryption device through other protocols.
As shown in fig. 1, the present invention also protects a processing system of TS stream, which includes a transmitting device and a decrypting device, corresponding to the above method.
The sending device serves as a Host (Host) and comprises a segmentation module and a first transmission module. The segmentation module encapsulates the TS stream into segments, and the first transmission module transmits the segments to the decryption device via a corresponding protocol. In one embodiment, the first transmission module is a USB module.
The decryption device comprises a second transmission module, a fragment disassembling module, an effective TS packet filtering module, a TS packet processing module and a fragment assembling module.
The second transmission module communicates with the first transmission module through a corresponding protocol, and when the first transmission module is a USB module, the second transmission module is also a USB transmission module, so the decryption device is also called a USB decryption device. The fragment disassembling module is also called as Fragments disassembling module, and separates the protocol data of the fragment received by the second transmission module from the TS stream data. And the effective TS packet filtering module screens out invalid TS packets in the TS stream data and reserves effective TS packets. The TS packet processing module decrypts the effective TS packet, and on the basis, the TS packet processing module can also perform at least one of descrambling and secondary encryption on the decrypted TS packet. The fragment assembly module is also called as Fragments assembly module, and the fragment assembly module re-encapsulates the TS packet after processing output by the TS packet processing module according to the protocol data.
Both the filtering and decryption processes for invalid packets may cause inconsistency between the received data and the data returned to the sending device after processing, at least the data lengths being different. Equipment restart or renegotiation is generally required, and the negotiation process can cause more data loss; however, according to the characteristics of the stream, the patent continuously acquires data from the sending equipment and repacks the data, so that renegotiation is not needed, and the number of lost packets is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method for processing a TS stream by a decryption device, comprising:
the sending equipment encapsulates the TS stream into segments and transmits the segments to the decryption equipment through a corresponding protocol;
the decryption device receives the fragment and separates the protocol data of the fragment from TS stream data;
the decryption device respectively processes the protocol data and the TS stream data, filters invalid TS packets in the TS stream data, and decrypts the valid TS packets;
and the decryption equipment repackages the processed TS packet according to the protocol data and transmits the TS packet to the sending equipment through a corresponding protocol.
2. The method for processing the TS stream by the decryption device according to claim 1, wherein the decryption device decrypts the valid TS and then performs at least one of descrambling and secondary encryption.
3. The method for processing the TS stream by the decryption device according to claim 1, wherein the fragments of the TS stream are transmitted between the transmission device and the decryption device by a USB protocol.
4. The method for processing a TS stream by a decryption device according to claim 1, wherein a valid TS packet and an invalid TS packet are distinguished based on a sync byte and a fixed size of the TS packet.
5. A TS stream processing system including a transmission device and a decryption device, wherein the transmission device includes: a segmentation module for encapsulating the TS stream into segments, and a first transmission module for transmitting the segments to a decryption device through a corresponding protocol;
the decryption apparatus includes: the second transmission module is used for communicating with the first transmission module through a corresponding protocol, the segment disassembling module is used for separating protocol data of the segment received by the second transmission module from TS stream data, the effective TS packet filtering module is used for screening invalid TS packets in the TS stream data and reserving effective TS packets, the TS packet processing module is used for decrypting the effective TS packets, and the segment assembling module is used for repackaging the processed TS packets output by the TS packet processing module according to the protocol data.
6. The system for processing TS stream of claim 5, wherein the first transmission module and the second transmission module are USB modules.
7. The system for processing TS stream of claim 5 wherein the TS packet processing module at least one of descrambles and re-encrypts the decrypted TS packets.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111486347.8A CN114205135A (en) | 2021-12-07 | 2021-12-07 | TS stream processing method and TS stream processing system of decryption device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111486347.8A CN114205135A (en) | 2021-12-07 | 2021-12-07 | TS stream processing method and TS stream processing system of decryption device |
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| CN114205135A true CN114205135A (en) | 2022-03-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595197A (en) * | 2012-01-19 | 2012-07-18 | 北京数码视讯软件技术发展有限公司 | Transfer system protection method and device |
| EP2667631A1 (en) * | 2012-05-23 | 2013-11-27 | TP Vision Holding B.V. | Data processing system and method |
| WO2015109904A1 (en) * | 2014-01-22 | 2015-07-30 | 深圳国微技术有限公司 | Method of identifying multiple transport streams based on usb interface |
| CN108282397A (en) * | 2017-12-26 | 2018-07-13 | 深圳数字太和科技有限公司 | A kind of hybrid network gateway for supporting plurality of access modes |
| CN108322777A (en) * | 2018-01-10 | 2018-07-24 | 成都驰通数码系统有限公司 | A kind of system and processing method for supporting AC-3, AAC, DRA audio transparent transmission |
| CN113132766A (en) * | 2021-03-17 | 2021-07-16 | 杭州当虹科技股份有限公司 | VBR (video base layer) sending method in TS (transport stream) packaging format |
-
2021
- 2021-12-07 CN CN202111486347.8A patent/CN114205135A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595197A (en) * | 2012-01-19 | 2012-07-18 | 北京数码视讯软件技术发展有限公司 | Transfer system protection method and device |
| EP2667631A1 (en) * | 2012-05-23 | 2013-11-27 | TP Vision Holding B.V. | Data processing system and method |
| WO2015109904A1 (en) * | 2014-01-22 | 2015-07-30 | 深圳国微技术有限公司 | Method of identifying multiple transport streams based on usb interface |
| CN108282397A (en) * | 2017-12-26 | 2018-07-13 | 深圳数字太和科技有限公司 | A kind of hybrid network gateway for supporting plurality of access modes |
| CN108322777A (en) * | 2018-01-10 | 2018-07-24 | 成都驰通数码系统有限公司 | A kind of system and processing method for supporting AC-3, AAC, DRA audio transparent transmission |
| CN113132766A (en) * | 2021-03-17 | 2021-07-16 | 杭州当虹科技股份有限公司 | VBR (video base layer) sending method in TS (transport stream) packaging format |
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