Packet header design method based on MMT (MPEG media transport) protocol transmission and recombination non-sequential media

A technology of protocol transmission and design method, applied in transmission systems, electrical components, etc., can solve the problem that MMTP cannot achieve the purpose of non-sequential media MPU reorganization, and achieve the effect of increasing reliability

Inactive Publication Date: 2017-01-11
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problem that the MMTP header structure defined in the international standard ISO / IEC DIS 23008-1 cannot achieve the purpose of non-sequential media MPU reorganization, the purpose of the present invention is to provide a method for designing headers based on MMT protocol transmission and reorganization of non-sequential media. This method is a MMTP packet header design scheme based on MMT protocol for non-sequential media transmission and reassembly

Method used

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  • Packet header design method based on MMT (MPEG media transport) protocol transmission and recombination non-sequential media
  • Packet header design method based on MMT (MPEG media transport) protocol transmission and recombination non-sequential media
  • Packet header design method based on MMT (MPEG media transport) protocol transmission and recombination non-sequential media

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Embodiment 1

[0032] Since the frag_counter field limits the number of fragments that can be fragmented during the transmission of the same data unit to a maximum of 2 8 =256, if the non-sequential media uses item as data unit (DU) for fragment transmission, as attached figure 1 As shown, the length of each item cannot exceed 1440Byte×2 8 = 360KByte. At the same time, according to the attached figure 2It can be seen that time-sequence media is transmitted in fragments using MFU as a data unit, and the size of the MFU of time-sequence media is also limited within 360KB. If an item or an MFU corresponds to a picture, the size of a picture cannot exceed 360KB, which obviously cannot meet the current demand for high-definition picture transmission. Therefore, the frag_counter field can be extended from 8 bits to 16 bits to relax the size limit on a single item or a single MFU. In this embodiment, the frag_counter field is expanded from 8 bits to 16 bits as an example for illustration. In p...

Embodiment 2

[0034] If the non-sequential media uses item as a data unit (DU) for fragmentation transmission, combined with Embodiment 1, even if the size of each item does not exceed 360KB, and can be correctly fragmented and transmitted, the receiving end can only The MMTP packets perform mechanical stacking of data. Once the data packet is out of order, only through the DU_Header of the non-sequential media, that is, the 32-bit item_ID cannot perform correct fragment reassembly, and data recovery will be wrong, so it is necessary to add a 32-bit offset to the DU_Header part of the non-sequential media The amount (offset) field is used to distinguish the sequence of data in the MMTP packet. The internal structure of the modified non-timing media DU_Header is as follows Figure 6 As shown, the 32-bit field offset is added after the original 32-bit field item_ID. Wherein, the offset field indicates the offset of the load in the data packet in the corresponding item, so as to regularly fi...

Embodiment 3

[0036] If the item is subdivided into extents (see Section 8.11.3 of the international standard ISO / IEC 14496-12 - "iloc" Box), as attached image 3 shown. At this time, the MMTP packet will be transmitted in fragments with the extent as the data unit. Then, a 16-bit extent_number field needs to be added to the DU_Header part of the non-sequential media to distinguish the sequence of the extents in the item, so as to manage the MMTP data packets hierarchically.

[0037] Combining Embodiment 2 and Embodiment 3, and combining the definition of "iloc" Box in the international standard ISO / IEC 14496-12, it is finally determined to add a 16-bit extent_number field and a 32-bit offset field in the DU_Header part of the non-sequential media. Modified structure of the DU_Header section of non-sequential media Figure 7 As shown, the 16-bit extent_number field is added after the original 32-bit field item_ID, and then the 32-bit field offset is added. Among them, the extent_number f...

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Abstract

The invention provides a packet header design method based on an MMT (MPEG media transport) protocol transmission and recombination non-sequential media. According to the method, necessary information for non-sequential media recombination is increased in an MMTP packet header structure, the transmission reliability of the non-sequential media is increased, and transmission and recombination of the non-sequential media are realized by employing the MMT protocol. According to the method, the technical vulnerability that an existing MMT protocol standard cannot realize transmission and recombination of the non-sequential media is effectively filled and completed.

Description

technical field [0001] The present invention relates to a header design scheme for transmitting and recombining non-sequential media data based on the MMT protocol, and more specifically, relates to a packet format of the header of a data unit when the MMT protocol is used to transmit and recombine non-sequential media design. Background technique [0002] With the rapid development of computer technology and network technology in recent years, multimedia services have played an increasingly important role in people's study, work and life. However, personalization of Internet multimedia content and more flexible multimedia access methods pose new challenges to multimedia file packaging and transmission technologies. [0003] Recognizing the new deficiencies of existing standards, in order to improve the transmission of multimedia data on the Internet, the MPEG organization initiated the formulation of a new standard, the first part of the international standard ISO / IEC DIS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06
CPCH04L69/164H04L69/06H04L69/22
Inventor 张文军徐异凌谢绍伟孙军管云峰柳宁
Owner SHANGHAI JIAO TONG UNIV
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