CN103347201A - Video transmission method and system used in group calling of trunking system - Google Patents
Video transmission method and system used in group calling of trunking system Download PDFInfo
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Abstract
The invention discloses a video transmission method used in group calling of a trunking system. The trunking system comprises a switching node, a source side and a target side. The method comprises the steps that video signals are encoded in a hierarchical mode by the source side and are marked with different video hierarchical classes, the switching node determines expected video hierarchical classes sent to the target side according to the response of the target side, and the switching node sends video bitstreams corresponding to the expected video hierarchical classes to the target side. According to the video transmission method, transmission of videos with different qualities is achieved, and requirements of multiple users for different video qualities and requirements of multiple base stations for different data flows in the trunking system are met.
Description
Technical field
The present invention relates to wireless communication technology field, especially relate to video transmission method and Video transmission system in the group system group calling.
Background technology
Group system not only can provide functions such as voice, short-range data communication, and the video image business can also be provided, thereby provides more directly perceived, abundant multimedia information service for the user.The video group-calling service of group system can send to the video of appointment all user terminals of selected phone group.In group system, the data traffic difference that different base station is supported, for example, the wireless base station channel that has can only support 500kbps with interior data traffic, the wireless base station channel that has, wired dispatching desk etc. are supported the data traffic that 10Mbps is above; In addition, different group membership's terminals have different requirements to video image quality.For example: dispatching desk needs the high video image of resolution for video being shown at equipment such as video walls, and common group memberships such as hand platform to video resolution require relatively low.In existing group system, group calling does not take into account different base station flow and multiple users to the solution of different video quality requirement at video.Normally the video source end produces the fixing compress coding data of video quality, and the group system switching control center (hereinafter to be referred as: it is all identical the center) to be sent to the video code flow of each base station, and under the normal condition, the video quality that decoding terminals is play also is the same.Fig. 1 shows the schematic diagram of each part transmission of video coded data in the existing group system.Switching control center is looked closely coded data frequently from video source end reception sources, forwards it to the base station then, and last base station transfers to group membership's terminal with this video data encoder again.The center that Figure 2 shows that is to the concrete handling process of group calling.Wherein, this handling process is: receive video group calling application; Initiate group calling to called base station and set up (the video coding that carries the source end in the signaling is described); The group calling of receiving the base station is set up successfully and is replied; Start the video coding; To be forwarded to the base station from the video code flow of source end.This method is after once encoding, and video code flow is just fixing.
In other similar communication system, in order to satisfy different transmission nodes to the different demands of video, usually the video that the switching control center that needs system generates the source end carries out secondary or coding repeatedly, generate the coded data of the different code checks of multichannel and video quality, be transferred to each node again, this repeatedly Methods for Coding makes the systematic comparison complexity, to the performance requirement height of switching control center, and increased the video time-delay, and be not suitable for group system.
Therefore, can not provide the defective of different quality video at having group system now, not have effective solution as yet.
Summary of the invention
The technical problem that the bright embodiment of we solves provides the video transmission method in a kind of group system group calling, to realize the transmission of different quality video.
To achieve these goals, according to an aspect of the present invention, provide the video transmission method in a kind of group system group calling, wherein, group system comprises: switching node, source end and destination; This method may further comprise the steps: the source end is encoded into the form of layering with vision signal, and is marked respectively with different video segmentation class; Switching node is according to the response of destination, determines to be sent to the video segmentation class of the expection of destination; Switching node is sent to destination respectively with the video code flow corresponding with the video segmentation class of expection.
Preferably, in the response of switching node according to destination, the step of video segmentation class of determining to be sent to the expection of destination further comprises: switching node is sent to destination by signaling with the selection information of video segmentation class; Destination arranges the video segmentation class of expection in replying signaling.
Preferably, also comprised before switching node determines to be sent to the step of video segmentation class of expection of destination: switching node receives the video group calling application from the source end; Switching node is initiated group calling to described destination and is set up signaling, wherein, carries the selection information of video segmentation class in the signaling.
Wherein, the response of destination comprises: the information that shows the video segmentation class of expection with the form of signaling.
Preferably, switching node will with also comprise before the corresponding multi-layer video code stream of video segmentation class of expection is sent to the step of destination: switching node generates multichannel multi-layer video code stream to multi-layer video code stream demultiplexing and multiplexing again.
Preferably, destination uses a down link, receives the described multi-layer video code stream from described switching node, with one deck or the multi-layer video code stream of decoding as required.
Wherein, the source end adopts scalable video.
Wherein, destination is dispatching desk or portable terminal.
For achieving the above object, according to another aspect of the present invention, also provide the Video transmission system in a kind of group system group calling, wherein, group system comprises: switching node, source end and destination; Switching node is used for the response according to destination, determines to be sent to the video segmentation class of the expection of destination, but also is used for the video code flow corresponding with the video segmentation class of expection is sent to destination respectively; The source end is used for the request according to switching node, and vision signal is encoded into the form of layering, and is marked respectively with different video segmentation class.
Compared with prior art, technique scheme has the following advantages at least:
By adopting following steps: switching node is according to the response of destination, determines to be sent to the video segmentation class of the expection of destination; The source end is encoded into the form of layering with vision signal, and is marked respectively with different video segmentation class; Switching node is sent to destination respectively with the video code flow corresponding with the video segmentation class of expection.With scalable video (SVC) to video can hierarchical coding, the characteristic of transmission, decoding is applied to the video group-calling service of broadband wireless cluster, realize the transmission to the different quality video, satisfied a plurality of users in the group system to the requirement to the different pieces of information flow of the demand of different video quality and a plurality of base station.
Description of drawings
Fig. 1 is the schematic diagram of each part transmission of video coded data in the existing group system;
Fig. 2 is the process chart of existing switching control center to group calling;
Fig. 3 is that the switching node of the embodiment of the invention is to the process chart of group calling;
Fig. 4 is the schematic flow sheet of the video transmission method in the group system group calling of the preferred embodiment of the present invention;
Fig. 5 is the composition schematic diagram of the group system of the preferred embodiment of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and specific embodiment, but protection scope of the present invention is not limited to this.Need to prove that under the situation of not conflicting, the technical characterictic among the embodiment of the invention and the embodiment can make up mutually, and constitute technical scheme.
Fig. 3 is that the switching node of the embodiment of the invention is to the process chart of group calling.Video transmission method in the group system group calling of the embodiment of the invention may further comprise the steps:
Step S301: the source end is encoded into the form of layering with vision signal, and is marked respectively with different video segmentation class;
Step S302: switching node is according to the response of destination, determines to be sent to the video segmentation class of the expection of destination;
Step S303: switching node is sent to destination respectively with the video code flow corresponding with the video segmentation class of expection.
Wherein, group system comprises: switching node, source end and destination.Switching node can be switching control center etc.The source end can be the video source end.Destination can be destination access point (as base station etc.), group membership's terminal etc., and group membership's terminal can also be dispatching desk, portable terminal (for example: intercom, mobile phone etc.) etc.Wherein, the source end utilizes scalable video (Scalable Video Coding SVC) is encoded into vision signal the form of layering, is marked respectively with the video segmentation class then.For example: represent basic layer coding with video segmentation class 1; Represent basic layer+enhancement layer 1 coding with video segmentation class 2; Represent basic layer+enhancement layer 1+ enhancement layer 2 codings with video segmentation class 3 ..., the rest may be inferred; The video segmentation class is more high, and contained video enhancement layer is more many, and code check is more big, and then the video quality of Hui Fuing is more high, thereby distinguishes different encoded video data stream amount and video quality with the video segmentation class.When bandwidth was not enough, a code stream to basic layer transmitted and decodes, but at this moment the video quality of decoding is not high.When bandwidth slowly becomes big, can transmit the decoding quality that improves video with the code stream of decoding enhancement layer.So-called hierarchical coding, just refer in time, space and divide qualitatively, output multi-layer video code stream (comprising basic layer and enhancement layer), wherein the data of basic layer can make decoder decode the elementary video content fully normally, but the frame per second of the video image that is obtained by the data of basic layer is lower, thereby causes resolution lower or quality is lower.When limited or channel circumstance is complicated at channel, can guarantee that decoding end or group membership's terminal can receive the smooth video image that can watch.When good or channel resource enriches when channel circumstance, can transmit enhancement data, to improve frame per second or resolution or video quality.And enhancement layer can multi-layer coding, and this just means that in the scope of video code flow total bitrate, the code check that receives is more big, and video quality is just more good.Wherein, the data bits that the unit interval transmitted when code check referred to transfer of data is that the kilobit per second is unit with kbps generally.
Pass through technique scheme, with scalable video (SVC) to video can hierarchical coding, the characteristic of transmission, decoding is applied in the video group-calling service of group system, thereby satisfied a plurality of users in the group system to the requirement to different flow of the demand of different video quality and a plurality of destination.
The video group calling is initiated by the source end, carries supported layering class in initiating signaling.Therefore, the source end only uses a link can satisfy need of work, and only need carry out encoding operation one time, has simplified workflow, has reduced the complexity of group system.
Wherein, switching node is according to the response of destination, and the step of video segmentation class of determining to be sent to the expection of destination specifically comprises: switching node is sent to destination by signaling with the selection information of video segmentation class; Destination arranges the video segmentation class of expection in replying signaling.More specifically, switching node and each destination are consulted the video segmentation class of the video code flow of transmission, that is: switching node is sent to destination (also can be the destination access point) by signaling with the selection information of the video segmentation class of relevant source end support, destination responds this then, this response comprises: show the information of the video segmentation class of described expection with the form of signaling, that is: carry the video segmentation class that expection separately receives in the answer signaling of each destination.Then, switching node determines to be sent to the video segmentation class of each destination according to the answer signaling of various objectives end.Switching node is to multi-layer video code stream demultiplexing and multiplexing again, generate multichannel multi-layer video code stream (one deck (basic layer) or multilayer (basic layer+enhancement layer)), and according to the video segmentation class of determining, one deck (basic layer) or multilayer (basic layer+enhancement layer) video code flow are sent to corresponding destination respectively.
Wherein, can also comprise before switching node determines to be sent to the step of video segmentation class of expection of destination: switching node receives the video group calling application from the source end; Switching node is initiated group calling to destination and is set up signaling, wherein, carries the selection information of video segmentation class in the signaling.
Wherein, switching node will with also comprise before the corresponding multi-layer video code stream of video segmentation class of expection is sent to the step of destination: switching node generates multichannel multi-layer video code stream to described multi-layer video code stream demultiplexing and multiplexing again.Switching node carries out demultiplexing to it after the video far-end receives the multi-layer video code stream, generate multichannel multi-layer video code stream.Wherein, multichannel multi-layer video code stream for example can comprise that one the tunnel only is the video code flow of basic layer, and one the tunnel is the video code flow of (basic layer+enhancement layer), and one the tunnel is the video code flow of (basic layer+enhancement layer 1+ enhancement layer 2) etc.Switching node is sent to destination according to the response of destination to the video segmentation class of its expection respectively with above-mentioned multi-channel video code stream then.
Destination uses a down link, will be from the multiplexing group membership's terminal that is in the destination communication range that is sent to of the video code flow that switching node receives.
Group membership's terminal receives one deck (basic layer) or multilayer (basic layer+enhancement layer) code stream, as required, selects decoding to play one or more layers video code flow.For example, if group membership's terminal receives (basic layer+enhancement layer) video code flow, then group membership's terminal can decide still decoding of the basic layer of decoding (basic layer+enhancement layer) according to self needs.Each group membership's terminal is selected the video coding and layering difference of decoding, then the video quality difference of Hui Fuing.Because same destination only uses a downlink transmission video code flow, so a plurality of group membership's terminals under the same destination are by selecting the different video segmentation of decoding, just can realize different video playing quality, for example: if group membership's terminal is only decoded basic layer, then can obtain the video image of low resolution; If the basic layer of group membership's decoding terminals and one or more enhancement layer then can obtain more high-resolution video image.In this way, avoid the time-delay of video coding, improved the quality of overall performance and the video traffic of system.
The embodiment of the invention also provides the Video transmission system in a kind of group system group calling, and wherein, group system comprises: switching node, source end and destination; Switching node is used for the response according to destination, determines to be sent to the video segmentation class of the expection of destination, but also is used for the video code flow corresponding with the video segmentation class of expection is sent to destination respectively; The source end is used for the request according to switching node, and vision signal is encoded into the form of layering, and is marked respectively with different video segmentation class.
The concrete transfer process of above-mentioned Video transmission system is corresponding with the flow process of said method, does not do being repeated in this description at this.
Below by a preferred embodiment method of mentioning in the literary composition is described in further detail.The preferred embodiment is the method in order to mention in the expository writing better just, and " preferably " wherein do not refer to the quality of embodiment, do not constitute the improper restriction to protection range of the present invention.
Below hypothesis does not constitute improper restriction of the present invention just in order to be illustrated more clearly in the present invention.
Fig. 5 is the composition schematic diagram of the group system of the preferred embodiment of the present invention.Wherein, suppose that the source end is the video source end; Switching node is switching control center; Destination is group membership's terminal.
H.264 or the video of SVC form coding the support of video source end.SVC video coding adopts the spatial scalable coding, generate two-layer video data encoder, can realize two kinds of video qualities, that is: the resolution of basic layer is that CIF(CIF is the standardized images form of using always (Common Intermediate Format), in protocol family H.323, it has stipulated the standard acquisition resolution of video capture device), the resolution of (basic layer+enhancement layer) is that 4CIF(is D1, it is the standard resolution of digital television system display format).The video segmentation class is two video segmentation class, that is: video segmentation class 1(its be basic layer CIF video, its maximal rate 500kbps) and video segmentation class 2(its be layer+enhancement layer 4CIF video substantially, its maximal rate 1.8Mbps).
Wherein, group membership's terminal 5a, 5b, 5c link to each other with the group system switching control center (can be wired connection, also can be wireless connections), and the network transmission bandwidth is more than the 100Mbps.Group membership's terminal 5a and can play the CIF video in the communication range of base station 51; Group membership's terminal 5b, 5c and can play CIF, 4CIF video respectively in the communication range of base station 52.
Wherein, the downlink channel bandwidth of base station 51 is in 500kbps, and the downlink channel bandwidth of base station 52 can reach 2Mbps.
Fig. 4 is the schematic flow sheet of the video transmission method in the group system group calling of the preferred embodiment of the present invention.
Step S401: switching control center receives the video group calling application from the base station.
Step S402: switching control center is initiated group calling to called base station and is set up signaling, carries the coded format of video source end and the selection information of video segmentation class in the signaling.Wherein, the basic layer of video segmentation class 1 representative CIF video, maximal rate 500kbps; Video segmentation class 2 representatives (basic layer+enhancement layer) 4CIF video, maximal rate 1.8Mbps.
Step S403: switching control center is received from the group calling of base station and is set up successful answer signaling (carrying the video segmentation class of base station expects in the signaling) afterwards, just determined to the video segmentation class of base station transmission.Wherein, dispatching desk and base station 52 are confirming that replying the video segmentation class that expection is set in the signaling is video segmentation class 2; Base station 51 is confirming that replying the video segmentation class that expection is set in the signaling is video segmentation class 1, and switching control center is confirmed the video segmentation class of each base station and the selected expection of dispatching desk.
Step S404: after the video group calling was set up successfully, switching control center just can start the video source end to layering video encoding operation (being about to the form that vision signal is encoded into layering), and the video source end generates the multi-layer video code stream.
Step S405: switching control center will carry out demultiplexing from the multi-layer video code stream (also being the multi-layer video coding data) of video source end, again multiplexing again, generate the multichannel video segmentation code stream corresponding with different video layering class, that is: the video segmentation code stream 1 that only comprise basic layer corresponding with video segmentation class 1 and (substantially layer+enhancement layer) video segmentation code stream 2 corresponding with video segmentation class 2.
Step S406: switching control center will be again multiplexing, be sent to different base stations respectively with the corresponding video code flow of different video layering class, that is: video segmentation code stream 1 is sent to base station 51, and video segmentation code stream 2 is sent to dispatching desk and base station 52.
Step S407: base station 51 is sent to group membership's terminal 5a with video segmentation code stream 1; Base station 52 is sent to group membership's terminal 5b and group membership's terminal 5c with video segmentation code stream 2.
Step S408: group membership's terminal 5a, 5b, 5c and dispatching desk are decoded accordingly according to needs separately.Dispatching desk and group membership's terminal 5c decode to the video segmentation code stream 2 that comprises basic layer and enhancement layer respectively and play, and video image resolution is 4CIF; Group membership's terminal 5a and group membership's terminal 5b decode to the video segmentation code stream 1 that only comprises basic layer respectively and play, and video image resolution is CIF.
The said method preferred embodiment has embodied structure and the workflow of the preferred embodiment of Video transmission system, the preferred embodiment of Video transmission system is not repeated in this description at this.
Description by above execution mode, those skilled in the art can be well understood to the present invention can add that the mode of necessary hardware platform realizes by means of software, certainly, also can pass through hardware, but the former is execution mode more under a lot of situations.Based on such understanding, technical scheme of the present invention can embody with the form of computer software product the part that prior art contributes in other words, this computer software product is stored in the storage medium (for example: CD-ROM, USB flash disk, portable hard drive etc.), comprise some instructions, use so that computing equipment (for example: personal computer, server or the network equipment etc.) is carried out the described method of each embodiment of the present invention.The invention is not restricted to any specific hardware and software.
The present invention aspect widely is not limited to shown in the literary composition and specific detail and the exemplary embodiments described, under the situation that does not deviate from flesh and blood of the present invention, any distortion that it may occur to persons skilled in the art that, improvement or replacement all fall into scope of the present invention.
Claims (9)
1. the video transmission method in the group system group calling, wherein, described group system comprises: switching node, source end and destination;
It is characterized in that:
Said method comprising the steps of:
Described source end is encoded into the form of layering with vision signal, and is marked respectively with different video segmentation class;
Described switching node is according to the response of described destination, determines to be sent to the video segmentation class of the expection of described destination;
Described switching node will be corresponding with the video segmentation class of described expection video code flow be sent to described destination respectively.
2. the video transmission method in the group system group calling according to claim 1 is characterized in that, described switching node is according to the response of described destination, and the step of video segmentation class of determining to be sent to the expection of described destination further comprises:
Described switching node is sent to described destination by signaling with the selection information of described video segmentation class;
Described destination arranges the video segmentation class of expection in replying signaling.
3. the video transmission method in the group system group calling according to claim 1 is characterized in that, also comprises determine to be sent to the step of video segmentation class of expection of described destination at described switching node before:
Described source end is initiated group calling and is set up signaling, wherein, initiates to carry supported layering class in the signaling;
Described switching node receives the video group calling application from described destination.
4. the video transmission method in the group system group calling according to claim 1 is characterized in that the response of described destination comprises: the information that shows the video segmentation class of described expection with the form of signaling.
5. the video transmission method in the group system group calling according to claim 1 is characterized in that, also comprises will the described multi-layer video code stream corresponding with the video segmentation class of described expection be sent to the step of described destination at described switching node before:
Described switching node generates multichannel multi-layer video code stream to described multi-layer video code stream demultiplexing and multiplexing again.
6. the video transmission method in the group system group calling according to claim 1, it is characterized in that, described destination is dispatching desk or terminal, receives the described multi-layer video code stream from described switching node, and terminal is decoded to the multi-layer video code stream as required.
7. the video transmission method in the group system group calling according to claim 1, it is characterized in that, destination is the base station, in the communication range of described base station, there is at least one terminal, terminal shares a down link, described base station is after the described multi-layer video code stream that receives from described switching node, and described base station sends it to described terminal, and described terminal is according to its needs decode one deck or multi-layer video code stream.
8. according to the video transmission method in each described group system group calling in the claim 1 to 7, it is characterized in that described source end adopts scalable video.
9. the Video transmission system in the group system group calling, wherein, described group system comprises: switching node, source end and destination;
It is characterized in that:
Described switching node is used for the response according to described destination, determines to be sent to the video segmentation class of the expection of described destination, but also be used for will be corresponding with the video segmentation class of described expection video code flow be sent to described destination respectively;
Described source end is used for the request according to described switching node, and vision signal is encoded into the form of layering, and is marked respectively with different video segmentation class.
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Application publication date: 20131009 |
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