CN101436990A - Method for automatically adjusting encoding rate, receiving device and communication system - Google Patents
Method for automatically adjusting encoding rate, receiving device and communication system Download PDFInfo
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Abstract
The embodiment of the invention provides a method for automatically adjusting coding rate, a receiving device and a communication system. The method comprises the following steps: receiving a data packet sent by a transmitting device; acquiring statistical information of the data packet, wherein the statistical information comprises at least comprises packet loss ratio; according to the obtained statistical information of the data packet, selecting adjusting strategy adopted by the bandwidth of each channel used to transmit data to the transmitting device; according to the adjusting strategy and preset information, acquiring an adjustment value of the bandwidth of each channel; and transmitting the information of the adjustment value to the transmitting device. The embodiment of the invention provides the method used for automatic adjustment of coding rate, the receiving device and the communication system, and ensures that a user on a receiving end can obtain better user experience.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method, receiving system and communication system of automatic adjustment code rate.
Background technology
Along with the communication technology constantly develops, can realize that many people carry out real time communication in different places, TV conference system as internet protocol-based IP, the people of different location passes through the multimedia data stream that receives is decoded in the meeting, see the people's of conference participation image, hear the sound that the participant sends.
In the prior art, in the IP-based TV conference system, the transmission of code stream can be adopted RTP (RTP:Real-time Transport Protocol) agreement, and IP network can not provide reliable transmission mechanism, and flow control or congested control are not provided.Therefore, under the certain situation of network total bandwidth, because other business causes flow to increase, make the available bandwidth of video conferencing reduce, cause audio-video code stream packet loss on network of video conferencing, the choppy voice that causes receiving terminal to be heard, the image of seeing has mosaic; After a period of time, because the decline of traffic carrying capacity, when the available bandwidth of video conferencing satisfied the transmission bandwidth of audio/video flow, receiving terminal can clearly be heard sound and see image.
In the prior art, owing to reasons such as having increased other business causes network bandwidth deficiency, subscriber equipment is not known the actual available bandwidth of current network, if comprise audio data stream and video data stream in the multimedia data stream that the user sends, when setting up conversation, transmitting terminal and receiving terminal are consulted the call bandwidth of transmitting terminal, can be according to the result who consults, the bandwidth chahnel that distributes bandwidth chahnel that audio data stream takies and video data stream to take by transmitting terminal, transmitting terminal is each distribution of flows bandwidth in the multimedia data stream according to the result who consults still under the situation of not knowing the current network actual available bandwidth.The state information of available technology adopting RTCP Real-time Transport Control Protocol (RTCP:Real-time Control Protocol) feedback data stream realizes the control to data flow of transmitting terminal or receiving terminal by call control signalling.When user's bandwidth that makes a call has caused packet loss greater than the actual available bandwidth of network, make receiving terminal can not obtain desirable audio frequency and video effect; The bandwidth of user's transmitted stream may not know under the situation of network actual available bandwidth that the user sends data according to this bit rate always, causes the waste of the network bandwidth like this less than the actual available bandwidth of network yet the user.Wherein, it will be appreciated that each data flow bandwidth chahnel and for the Client-initiated call bandwidth.
In the existing TV conference system, equipment self can not detect the network actual available bandwidth, can not provide a kind of automatic adjustment code rate to adapt to the technical scheme of network actual available bandwidth, more excellent experience is provided can not for the receiving terminal user.
Summary of the invention
The embodiment of the invention provides a kind of method, receiving system and communication system of automatic adjustment code rate, and solving prior art can not provide automatic adjustment code rate to adapt to the method for network actual available bandwidth.
The embodiment of the invention provides a kind of method of automatic adjustment code rate, comprising:
The packet that transmission and reception apparatus sends;
Obtain the statistical information of described packet, described statistical information comprises packet loss at least;
According to the statistical information of the described packet that obtains, select dispensing device is sent the adjustment strategy of each bandwidth chahnel employing of data;
According to the described information of adjusting strategy and presetting, obtain adjustment numerical value to described each bandwidth chahnel;
The information that sends described adjustment numerical value is to dispensing device.
The embodiment of the invention also provides a kind of receiving system, comprising:
Receiving element is used for the packet that transmission and reception apparatus sends;
First acquiring unit is used to obtain the statistical information of described packet, and described statistical information comprises packet loss at least;
Selected cell is used for the statistical information according to the described packet that obtains, and selects the adjustment strategy that each bandwidth chahnel of described dispensing device transmission data is taked;
Second acquisition unit is used for obtaining the adjustment numerical value to described each bandwidth chahnel according to described strategy and the information that presets adjusted;
Transmitting element is used to send the information of described adjustment numerical value to dispensing device.
The embodiment of the invention also provides a kind of communication system, comprising:
Receiving system, be used for the packet that transmission and reception apparatus sends, obtain the statistical information of described packet, described statistical information comprises packet loss at least, according to the statistical information of the described packet that obtains, select dispensing device is sent the adjustment strategy of each bandwidth chahnel employing of data, according to the described information of adjusting strategy and presetting, obtain the adjustment numerical value to described each bandwidth chahnel, the information that sends described adjustment numerical value is to dispensing device;
Dispensing device is used to send packet to receiving system, obtains the information of the adjustment bandwidth of receiving system transmission, according to the information of the adjustment bandwidth that gets access to, adjusts each bandwidth chahnel that sends data.
The embodiment of the invention also provides a kind of encoder, comprising:
Second receiving element is used to receive the statistical information of packet, and described statistical information comprises packet loss at least;
First selected cell is used for the statistical information according to the described packet that obtains, and selects the adjustment strategy that each bandwidth chahnel of described dispensing device transmission data is taked;
The 3rd acquiring unit is used for obtaining the adjustment numerical value to described each bandwidth chahnel according to described strategy and the information that presets adjusted;
Coding unit is used for the adjustment numerical value to each bandwidth chahnel that obtains according to described, encodes.
The embodiment of the invention adopts the statistics according to the packet that obtains in the receiving system, select dispensing device is sent the adjustment strategy that each bandwidth chahnels of data is taked by this statistics, obtain adjustment width to each bandwidth chahnel, the result who obtains is sent to dispensing device, realize automatic adjustment according to the information that receives each bandwidth chahnel by dispensing device.The embodiment of the invention has realized a kind of method of automatic adjustment code rate, makes that the receiving terminal user can be with obtaining better user experience.
Description of drawings
Fig. 1 is the flow chart of the method for a kind of automatic adjustment code rate that provides of the embodiment of the invention;
Fig. 2 is the flow chart of the method for a kind of automatic adjustment code rate that provides of the embodiment of the invention one;
Fig. 3 is the computational methods demonstration graph of network packet loss rate in the embodiment of the invention one;
Fig. 4 is the flow chart of the method for a kind of automatic adjustment code rate that provides of the embodiment of the invention two;
Fig. 5 is the variation diagram that sends the shared bandwidth of data when the network actual available bandwidth changes in the embodiment of the invention two;
Fig. 6 is the logical block figure of a kind of receiving system of providing of the embodiment of the invention four;
Fig. 7 is the composition diagram of a kind of communication system of providing of the embodiment of the invention five.
Embodiment
The embodiment of the invention provides a kind of method, receiving system and communication system of automatic adjustment code rate.By the statistical information of receiving system according to the packet that receives, the adjustment strategy that selection is taked each bandwidth chahnel of dispensing device transmission data is adjusted each bandwidth chahnel that it sends data according to adjusting the policy control dispensing device.The method of summarizing below that the embodiment of the invention is provided is done explanation.Referring to shown in Figure 1, comprising:
Step Q1: the packet that transmission and reception apparatus sends;
Step Q2: obtain the statistical information of described packet, described statistical information comprises packet loss at least;
Wherein, the statistical information of the packet that obtains among the step Q2 comprises the number that receives packet at least, therefore when knowing the packet number that dispensing device sends, can also obtain the packet loss of packet in this statistics, need to prove, except statistical data packet can also have other, receive the used time of packet etc. as statistics.
Step Q3:, select dispensing device is sent the adjustment strategy of each bandwidth chahnel employing of data according to the statistical information of the described packet that obtains;
Wherein, the statistical information of the packet that basis is obtained among the step Q3, selection sends the adjustment strategy of each bandwidth chahnel employing of data to dispensing device, can specifically be to judge whether the bandwidth of network is sufficient, usually when packet loss is very big, think that the bandwidth of network is inadequate, then need dispensing device to reduce code rate in order to guarantee to send quality; Less or when being zero when packet loss, it has been generally acknowledged that the available bandwidth of network is relatively more sufficient, dispensing device can be used according to the demand of self and select whether to improve code rate.
Step Q4:, obtain adjustment numerical value to described each bandwidth chahnel according to the described information of adjusting strategy and presetting;
Wherein, among the step Q4, behind the adjustment strategy that gets access to the dispensing device code rate, concrete adjustment numerical value for the dispensing device code rate, also need to obtain, that is to say the occurrence that will obtain the dispensing device code rate according to the information that presets in the designing requirement according to designing requirement.
Step Q5: send to comprise and describedly obtain information to the adjustment numerical value of described each bandwidth chahnel to dispensing device.
Wherein, need to prove that above explanation is by the performed operation of receiving system, it is concrete that receiving system will obtain, require the value of dispensing device code rate, this value is being sent to dispensing device, dispensing device is the passive control that is subjected to receiving system.In fact, dispensing device also can execution in step Q3, Q4, Q5 obtains the value of regulating self code rate.
The above method of a kind of automatic adjustment code rate that provides of the explanation embodiment of the invention of Gai Kuoing.Method, device and the communication system of a kind of automatic adjustment code rate that the embodiment of the invention is provided below in conjunction with specific embodiment are done explanation.
Embodiment one, and a kind of method of automatic adjustment code rate referring to shown in Figure 2, comprising:
Step 1: the packet that the receiving system transmission and reception apparatus sends;
Wherein, at least one data channel of receiving system in step 1, the packet that transmission and reception apparatus sends by setting up with dispensing device.For example: receiving system receives packet and can comprise: through packet and many video channel data packets for transmission of a voice data channel transfer.Wherein, the packet that sends in the step 1 can be the RTP packet that adopts the Real-time Transport Protocol encapsulation.The present invention does not limit data is sealed the agreement that the harness body adopts.
Step 2: receiving system is according to the sequence number (SN:Sequence Number) that receives in the packet, the packet loss of computing network;
Wherein, in step 2 computational methods of packet loss for example, referring to shown in Figure 3, can comprise: the hypothesis dispensing device has sent 10 packets in (1), and receiving system receives 10 packets.Can think actual available bandwidth abundance in the network, promptly packet loss is zero; (2) the hypothesis dispensing device has sent 10 packets in, and wherein, sequence number has been 3 data-bag lost, and receiving system receives 9 packets, and the packet loss of then judging network is 10%; (3) the hypothesis dispensing device has sent 10 packets in, and wherein, sequence number has been 3 and 7 data-bag lost, and receiving system receives 8 packets, and the packet loss of then judging network is 20%.
Step 3: receiving system judges whether to reduce the call bandwidth that dispensing device sends data according to the packet loss that calculates, if, enter step 4, if not, enter step 6;
Wherein, the packet loss that basis calculates in step 3, the call bandwidth that judges whether to reduce dispensing device transmission data that carries out, can be specifically: judge packet loss in the receiving system then greater than threshold values, then judge the current available bandwidth deficiency of network, dispensing device need be reduced sending the data call bandwidth, judge packet loss in the receiving system, then judge the current available bandwidth abundance of network less than threshold values.
Wherein, threshold values can be configurable according to the actual conditions defined.When the data that receive in the receiving system are lower than threshold values, can think that the bandwidth that receiving system receives is exactly the actual available bandwidth of network.Be the current actual available bandwidth deficiency of network, caused packet loss.
Step 4: receiving system calculates the current actual available bandwidth of network according to the bit bit number that receives data;
Wherein, in step 4 the current actual available bandwidth of computing network can be receiving system with 1 second be unit statistics packet loss, packet loss greater than threshold value after, the bit bit number of being received in this second is exactly the network actual available bandwidth of this second; Perhaps, supposing had 4 seconds packet loss to occur greater than threshold value in 8 seconds, perhaps had 4 seconds packet loss to occur greater than threshold value continuously, and it is average back as current network actual available bandwidth greater than 4 seconds network actual available bandwidth of threshold value packet loss to occur.
It will be appreciated that the concrete numeral of being given an example in this section literal is for convenience of the understanding to the embodiment of the invention, should not be construed as the qualification to the embodiment of the invention, the numeral that occurs in the following literal also all needs such understanding.
Step 5: receiving system send the decline call bandwidth to the information of network actual available bandwidth to dispensing device;
Step 6: receiving system is judged the dispensing device call bandwidth that whether descended, if enter step 7;
Wherein, the effect of step 6 is that receiving system need to judge whether the rising of notice dispensing device to send the call bandwidth of data, because in some cases, though the actual available bandwidth abundance of network, but, receiving system and dispensing device preset send data call bandwidth for fixing, even call bandwidth less than the network actual available bandwidth, the call bandwidth that does not also need to send data is adjusted.Therefore, when being judged as in the step 6 negated, receiving system was not to handling.
Step 7: receiving system send to raise call bandwidth to the information that presets bandwidth to dispensing device;
Wherein, the width that presets bandwidth in step 7 can be according on once the receiving system dispensing device that requires that sends to dispensing device call bandwidth is adjusted to the information of certain value, and obtain.For example, last receiving system sends to the dispensing device requirement call bandwidth is adjusted to the actual available bandwidth of network, the width of the bandwidth that then presets, available be network actual available bandwidth 105%.It will be appreciated that, the bandwidth that in step 7, presets normally according on once adjusted call bandwidth determine.
Above step 1 to the explanation of step 7 is receiving systems to the processing method of the packet that receives, when realizing the method that the embodiment of the invention provides, dispensing device sends packet by the data channel with receiving system foundation, dispensing device is carried out sending the adjustment of the shared call bandwidth of data according to receiving the information that receiving system sends.
By above explanation, receiving system and dispensing device have been realized a kind of method of automatic adjustment code rate jointly, in order to make the receiving terminal user better user experience can be arranged, and this method can also may further comprise the steps:
Step 8: receiving system judges whether the last information that sends to dispensing device adjustment bandwidth is the rise call bandwidth, if, enter step 9, if not, enter step 4;
Step 9: receiving system sends the call bandwidth that will send data and remains on the information of last adjusted bandwidth to dispensing device.
Wherein, after dispensing device receives in the step 9 information that sends, will a period of time keep with on once to send the call bandwidth of data constant, this a period of time can be with being to be preset in the dispensing device.
Wherein, need to prove: after dispensing device once raises call bandwidth, make the packet loss of the network that obtains in the receiving system less than the value that presets, then receiving system notice dispensing device raises call bandwidth, after dispensing device receives the information that raises call bandwidth, raise call bandwidth, and this time raise packet loss that bandwidth causes receiving terminal greater than the value that presets, receiving terminal is judged and is reduced call bandwidth.Hence one can see that, does the process that can cause reducing call bandwidth and raise call bandwidth so always in the up vibration of network actual bandwidth.In order to prevent that such situation from occurring, step 8 and step 9 have been increased, be when receiving system is judged network for the first time need reduction of speed in the process of raising speed, then receiving system thinks that the last call bandwidth that raises is the actual available bandwidth of network, requires dispensing device all to send data with this call bandwidth in a period of time.This call bandwidth can be referred to as " bandwidth binds ".Simultaneously, in order to prevent the aging of bandwidth of binding, preset the duration of a period of time as the case may be.
Also need to prove, in step 3, be judged as when negating, can further include:
Step 10: receiving system judges according to the packet loss that calculates whether the actual available bandwidth of network is sufficient, if, enter step 6, if not, receiving system does not process.
Wherein, more than when the explanation packet loss is greater than the threshold values that presets in step 3, judging needs to reduce call bandwidth, when judging that packet loss is not more than threshold values, can judge further whether the network bandwidth is genuine sufficient, understands for convenience, is 5% with the threshold values that presets herein, when the detected packet loss of receiving system greater than 0 less than 5%, can judge two kinds of situations: a kind of is that the actual available bandwidth deficiency of network has caused packet loss; Another kind is the actual available bandwidth abundance of network, but because the shake of network and other accidentalia have caused packet loss, and situation also can be thought the actual available bandwidth abundance of network like this.Therefore, in order to judge the actual available bandwidth abundance of more accurate judgement network, then can preset a period of time packet loss is 0 o'clock, judges the actual available bandwidth abundance of network.
In fact, the quantity of data packets that receiving system can receive receiving system, the statistics of losing such as quantity of data packets send to receiving system, and concrete can adopt exchange of control information between RTCP Real-time Transport Control Protocol (RTCP:Real-time Transport Control Protocol) and the dispensing device.Dispensing device calculates packet loss according to the statistics that the receiving system that receives sends, and judges the situation of network actual available bandwidth.The concrete execution in step of dispensing device can be released easily by the explanation of above operating process to receiving system.
It more than is the explanation of the method for a kind of automatic adjustment code rate that provides of the embodiment of the invention one, the packet that receiving system sends by transmission and reception apparatus in this method, calculate the packet loss of network, judge the situation of network actual available bandwidth according to the size of packet loss, adopt corresponding strategy adjustment to send the call bandwidth of data, the notice dispensing device is carried out and is adjusted the call bandwidth that sends data.The embodiment of the invention one has realized the code rate of automatic adjustment dispensing device, for the receiving terminal user provides better user experience.
More than in the explanation of method that embodiment one is provided, the quantity of the data channel of setting up between dispensing device and the receiving system can be a plurality of, for example: a voice data passage and a video data channel.The modulation bandwidth of explanation is the call bandwidth that the modulation dispensing device sends data in embodiment one, and does not have concrete restriction for each bar bandwidth chahnel of how adjusting dispensing device transmission data.Need to prove, the call bandwidth that dispensing device sends data be all data channel bandwidths of setting up between dispensing device and the receiving system and.
The technical scheme that provides of examples of implementation at the situation that a voice data passage and a video data channel are arranged between dispensing device and the receiving system, is done explanation for embodiment two for a better understanding of the present invention.
Embodiment two, a kind of method of automatic adjustment code rate.Receiving changes usually at the beginning of session is set up, need to consult both sides' ability and the information that both sides need understand between receiving terminal and the transmitting terminal, has first priority through consulting dispensing device and receiving system default audio data, therefore, when adjusting the call bandwidth of dispensing device transmission data, the voice data bandwidth is not adjusted.Wherein, suppose that the voice data bandwidth of consulting in receiving system and the dispensing device is 64K.Wherein, for the encoding and decoding agreement of different audio frequency, its bandwidth is unfixed.Concrete negotiations process is similar to prior art.Utilize existing Real-time Transport Protocol that multi-medium data is encapsulated in embodiments of the present invention.
The method of the embodiment of the invention three formulations referring to shown in Figure 4, comprising:
Step F 1: the packet that the receiving system transmission and reception apparatus sends, this packet comprises packets of audio data and video packets of data;
Wherein, packets of audio data and video packets of data all are the RTP packet.
Step F 2: receiving system calculates the packet loss of network according to the sequence number in the packet that receives;
Wherein, the step 2 of concrete computational methods in can reference example one.
Step F 3: receiving system judges whether to reduce the call bandwidth that dispensing device sends data according to the packet loss that calculates, if, enter step F 4, if not, enter step F 8;
Wherein, in step F 3, the concrete method of judging can be: supposing had 4 seconds packet loss to occur greater than 5% in 8 seconds, perhaps had 4 seconds packet loss to occur greater than 5% continuously, then judge the actual available bandwidth deficiency of network, judging needs to reduce the call bandwidth that dispensing device sends data.This determination methods can reduce the accidental shake of network at a time, makes packet loss a lot, and causes the erroneous judgement to the network actual bandwidth.Wherein, the 5%th, the threshold values that presets.
Step F 4: receiving system judges whether the last information that sends to dispensing device adjustment bandwidth is the rise call bandwidth, if, enter step F 7, if not, enter step F 5;
Wherein, this step F 4 is similar to step 8 among the embodiment one, and specifying can refer step 8.
Step F 5: receiving system obtains the downward adjustment numerical value to voice data bandwidth chahnel and video data channel bandwidth according to the bit number of the packet that receives and the information that presets;
Wherein, the method of specifically obtaining the adjustment numerical value of voice data bandwidth chahnel and video data channel bandwidth in step F 5 can be: had 4 seconds packet loss to occur greater than 5% in 8 seconds, it is average back as current network actual available bandwidth greater than 5% 4 seconds network actual available bandwidth packet loss to occur.Because the bandwidth chahnel of the voice data that presets is not modulated, then the voice data bandwidth chahnel is 64K, and then the video data channel bandwidth can adopt following formula to obtain:
Video is adjusted the actual bandwidth-voice-grade channel bandwidth of bandwidth=network
Step F 6: receiving system sends the adjustment numerical information obtain voice data bandwidth chahnel and video data channel bandwidth to dispensing device;
Step F 7: similar to step 9 among the embodiment one, receiving system sends the call bandwidth that will send data and remains on the information of last adjusted bandwidth to dispensing device;
Step F 8: similar to step 10 among the embodiment one, receiving system judges according to packet loss that calculates and the information that presets whether the actual available bandwidth of network is sufficient, if, enter step F 9, if not, receiving system does not process;
Wherein, manner of execution concrete in step F 8 is: if the packet loss in 8 seconds is not greater than 5% in step F 3, and packet loss all is 0, according to the information that presets, packet loss all is 0 in 8 seconds, then thinks the actual available bandwidth abundance of network, and dispensing device can raise call bandwidth.
Step F 9: similar to step 6 among the embodiment one, receiving system is judged the dispensing device call bandwidth that whether descended, if enter step 10;
Step F 10: receiving system obtains the numerical value that adjusts upward to voice data bandwidth chahnel and video data channel bandwidth according to the bit number of the packet that receives and the information that presets;
Wherein, the bandwidth that presets the maintenance voice data in the receiving system is the constant information of 64K, and therefore, receiving system calculates the width that raises video bandwidth can adopt formula:
Video is adjusted bandwidth=current dispensing device and is sent the bandwidth * 105%-voice-grade channel bandwidth of data
Step F 11: receiving system sends the information obtain the downward adjustment numerical value of voice data bandwidth chahnel and video data channel bandwidth to dispensing device.
Wherein, it will be appreciated that receiving system can send to dispensing device with the relevant statistics that receives packet, carry out to the judgement of network condition with according to judged result by dispensing device and adjust the shared bandwidth of transmission data automatically.
Explanation according to the method for the above a kind of automatic adjustment code rate that the embodiment of the invention two is provided, can release actual bandwidth when network easily by wretched insufficiency, when rising to the call bandwidth that sends greater than dispensing device gradually, the implementation of the method that provides among the embodiment two, referring to Fig. 5, the passage total bandwidth of calling out sends the shared bandwidth of packet as dispensing device, represent with thick lines in the drawings, the actual available bandwidth of network is represented with thin relatively lines, can be to reduce the shared bandwidth of video data that sends in the dispensing device earlier, then, when the network actual bandwidth is sufficient, dispensing device can raise the shared bandwidth of video data of transmission, and rise calculates packet loss in receiving system non-vanishing.When the bandwidth that adjust to send data made that packet loss is non-vanishing, the bandwidth of the transmission data of adjusting with the last time sent the bandwidth of data as dispensing device.Be execution in step F4 be exactly for the downward adjustment that prevents bandwidth and the process that adjusts upward always in the vibration up and down of network actual available bandwidth.In step F 9, preset simultaneously the time of certain hour, prevented the aging of bandwidth of binding as the call bandwidth of dispensing device transmission data.
By above explanation to the embodiment of the invention two, the packet that receiving system sends by transmission and reception apparatus in this method, calculate the packet loss of network, judge the situation of network actual available bandwidth according to the size of packet loss, adopt corresponding strategy adjustment to send the voice data bandwidth chahnel and the video data channel bandwidth of data, the notice dispensing device is carried out and is adjusted each the bandwidth chahnel bandwidth that sends data.The embodiment of the invention two has realized the method to the code rate of the automatic adjustment dispensing device under the situation that two data passages are arranged, for the receiving terminal user provides better user experience.
Embodiment three, a kind of method of automatic adjustment code rate, this method is similar to the method that embodiment two provides, and different is, comprised two media channels in the session that dispensing device and receiving system are set up in embodiment two, having comprised: voice data passage and video data channel.And comprise in the session of setting up in the embodiment of the invention three: a voice data passage and many video channels.Priority in the shared bandwidth of embodiment three sound intermediate frequency data is the highest.
Owing to judge the method for network actual bandwidth and the embodiment one that has illustrated among the embodiment three, method in two is similar, be primarily aimed at below and judge actual bandwidth in the network and send less than dispensing device under the situation of the shared call bandwidth of data, the method for dispensing device downward modulation call bandwidth is done explanation.
Before this method of explanation, need to prove, when including the video channel of one or more in the session of setting up, the video channel classification of one or more can be comprised main flow and auxilliary stream.Wherein, can be about the attribute of auxilliary stream and control method with reference to the H.300 description in the H2.39 agreement in the protocol family of prior art, auxilliary stream can be divided into two classes, comprises the auxilliary stream of on-the-spot Live mode and presents the auxilliary stream of Presentation mode.Wherein, the auxilliary stream of the Live mode image of transmission activity normally; The auxilliary stream of Presentation mode is the transmission film.
When auxilliary stream is the Live mode, comprise in the session that dispensing device and receiving system are set up: voice data passage and mainstream data passage and auxilliary flow data passage.Detect the actual bandwidth deficiency of network when receiving system, when needing the downward modulation dispensing device to send the call bandwidth of data, receiving system at first guarantees the bandwidth of voice data, the bandwidth of supposing voice data is 64K, promptly the call bandwidth of voice data is not adjusted, the data bandwidth of main flow and auxilliary stream is adjusted.The method of concrete adjustment can comprise multiple, make final mainstream data bandwidth, auxilliary flow data bandwidth and voice data bandwidth the three's and be actual bandwidth by the detected network of packet loss.It is constant to keep the mainstream data bandwidth, adjusts auxilliary flow data bandwidth, up to mainstream data bandwidth, auxilliary flow data bandwidth and voice data bandwidth the three's and be actual bandwidth by the detected network of packet loss.The bandwidth that the adjustment of receiving system notice dispensing device sends data is the bandwidth that calculates in the receiving system.
When auxilliary stream still was the Live mode, when raising the call bandwidth of dispensing device transmission data according to the judgement needs, receiving system can and detect the actual bandwidth situation of network according to the information that presets, and how decision raises each bandwidth chahnel of transmission data.Wherein, raise dispensing device and send the strategy of the strategy of each bandwidth chahnel of data each bandwidth chahnel of downward modulation in also can reference example two, it is constant promptly to preset the voice data bandwidth chahnel, and simultaneously the bandwidth chahnel of main flow and auxilliary stream is adjusted upward to current 105%.Also have other to adjust upward the strategy of each bandwidth chahnel, do not limit herein.
When auxilliary stream is the Presentation mode, because what transmit in the auxilliary stream of Presentation mode is film, when the bandwidth of transmission film data was 128K usually, receiving terminal can obtain visual effect preferably, and wideer bandwidth can not obviously promote visual effect for receiving system.Therefore, to the conference telephone system of the auxilliary stream that comprises the Presentation mode in the session, can be to the method for the downward modulation of mainstream data passage and auxilliary flow data passage with reference to following table 1.
Table 1
Wherein, as shown in table 1, when auxilliary stream is Presentation, and when auxilliary stream bandwidth is no more than 128K, be to guarantee that as possible the bandwidth of auxilliary stream can not reduce to the strategy of the reduction of speed of dispensing device, because, for assisting stream under the situation of Presentation, during the bandwidth of auxilliary stream deficiency 128K, the video effect that receives is undesirable, therefore, the code rate of elder generation's reduction of speed main flow is specifically decided according to designing requirement the reduction of speed strategy of main flow, also can set according to user's request.This reduction of speed strategy can be called strategy 1;
When if auxilliary stream is Presentation, assist the shared bandwidth of stream between 128K and 256K, if the actual available bandwidth deficiency of network, dispensing device reduces the strategy of code rate can selection strategy 2, that is: at first to the main flow reduction of speed, if when main flow is reduced between 128K and the 256K, the code rate of dispensing device is during still greater than the actual available bandwidth of network, then simultaneously main flow and auxilliary stream are carried out reduction of speed, make that main flow bandwidth and auxilliary stream bandwidth are basic identical.When if auxilliary stream is reduced to less than 128K, the code rate of dispensing device is then taked strategy 1 during still greater than the actual available bandwidth of network.
Also need to prove, when auxilliary stream is between 128K and 384K when adopting H.261/H.263 standard usually, adopt strategy 2.Assist generally speaking when flowing between 128K and 256K, adopt strategy 2.
When if auxilliary stream is Presentation, when assisting the shared bandwidth of stream (perhaps 384K) greater than 256K, adopt strategy 3, that is: when the code rate of dispensing device is still greater than the actual available bandwidth of network, earlier auxilliary stream is carried out reduction of speed, when auxilliary stream is reduced between 128K and the 256K (perhaps between 128K and the 384K), adopt strategy 2.
When assisting stream for the Presentation mode, and, the actual available bandwidth abundance of network, dispensing device can raise the call bandwidth that sends data, and concrete method for modulating up can raise 105% with main flow and the call bandwidth of assisting stream simultaneously.The method for modulating up that other can also be arranged is not done qualification herein.
By above explanation to the embodiment of the invention three, by adopting the quantity of data packets that receives in the receiving system, judge the situation of the bandwidth in the network, according to the data channel more than a road in the call bandwidth, can obtain at the bandwidth width that guarantees voice-grade channel under the prerequisite of auditory effect of effect, other multichannel data passage is divided into main flow and auxilliary stream, the preferential visual effect that guarantees that main flow bandwidth width can obtain respectively the bandwidth of main flow and auxilliary flow data passage adjusts.The embodiment of the invention four provides a kind of method of automatic adjustment code rate, this method be suitable for receiving system and dispensing device between the situation of a plurality of data channel is arranged, give the receiving terminal user can be with the better user experience of acquisition in this case.
More than be the explanation of method that the embodiment of the invention is provided, the following examples are the explanations to receiving system provided by the invention.
Embodiment four, and a kind of receiving system is described referring to Fig. 6, comprising: receiving element 10, first acquiring unit 20, selected cell 30, second acquisition unit 40 and transmitting element 50.
Wherein, receiving element 10 is used for the packet that transmission and reception apparatus sends;
First acquiring unit 20 is used for obtaining the statistics of the packet that receiving element 10 receives, and this statistics comprises the packet loss of packet at least;
Transmitting element 50, the adjustment numerical value that is used for second acquisition unit 40 is obtained sends to dispensing device.
Wherein, more than be the explanation of relatively summarizing to the explanation of this device, below in conjunction with concrete application scenarios this receiving system is elaborated.
A kind of receiving system that this embodiment provides, the packet that receiving element 10 transmission and reception apparatus of this receiving system send, wherein the packet of receiving system transmission can be by a plurality of data channel data packets for transmission, be that voice data passage and video data channel are example herein with the data channel, to describing of receiving system.First acquiring unit 20 obtains the statistics of packet, wherein keeps the packet loss that receives packet, and wherein, first acquiring unit 20 has the method for obtaining packet loss and can calculate by the sequence number in the packet; Selected cell 30 is selected dispensing device is sent the adjustment strategy that each shared bandwidth chahnel of data is taked according to information that presets and the packet loss that obtains; Its specific implementation can be, if the packet loss that in receiving system, presets continuous 4 seconds per seconds greater than 5%, then receiving system is selected that dispensing device is sent each shared bandwidth chahnel of data and is taked to reduce bandwidth; If the packet loss that gets access to continuous 4 seconds per seconds at receiving system is all less than 5%, and the do not descend speed of call bandwidth of dispensing device, then receiving system is selected that dispensing device is sent each shared bandwidth chahnel of data and is taked to raise bandwidth.
Wherein, for clearer understanding selected cell 30, selected cell 30 can comprise: first judging unit 301 and second judging unit 303.
Wherein, first judging unit 301 is used for according to the packet loss that obtains, and judges whether to reduce the call bandwidth that sends data;
When judged result in first judging unit 301 when being, second acquisition unit 40 obtains the numerical value that dispensing device is sent each bandwidth chahnel downward modulation of data; Wherein, second acquisition unit 40 concrete acquisition methods can be, according to the statistics that obtains in first acquiring unit 20, promptly receive the bit number of data, calculate the actual available bandwidth of network, when sending each bandwidth chahnel of data according to the downward adjustment of presetting, keep the bandwidth of voice data passage constant, deduct the information that the voice data bandwidth chahnel draws the video data channel bandwidth with the network actual available bandwidth, get access to the voice data bandwidth chahnel of downward adjustment dispensing device and the numerical value of video data channel bandwidth.It will be appreciated that when judging the bandwidth that will reduce the transmission data, then the current actual available bandwidth of network is to receive the shared bandwidth of data;
When judged result in second judging unit 302 when being, second acquisition unit 40 obtains the numerical value that dispensing device is sent key on each bandwidth chahnels of data; Wherein, it is similar that second acquisition unit 40 concrete acquisition methods obtain the method for reducing bandwidth numerical value together, promptly according to preset adjust upward bandwidth the time, it is constant to preserve the voice data passage, the bandwidth of video channel according to preset each on be adjusted to 105% of last video channel bandwidth.
The numerical value of the adjustment bandwidth that second acquisition unit 40 will obtain comprises: the numerical value that adjusts upward the numerical value of bandwidth or adjust bandwidth downwards is notified to transmitting element 50, and transmitting element sends to dispensing device with these information., carry out according to the information that receives by dispensing device sending the adjustment of each shared bandwidth chahnel of data.
In order preventing, and to prevent the aging of bandwidth of binding, can also to comprise the 3rd judging unit 303 in the selected cell 30 the bandwidth adjustment of dispensing device the up vibration of true bandwidth around network.
Wherein, the 3rd judging unit 303 is used for being judged as when being when first judging unit 301, judges whether the last bandwidth of adjusting is to raise call bandwidth.
If judged result is for being in the 3rd judging unit 303, then notify transmitting element 50 to send information that the call bandwidth that will send data remains on the last bandwidth of adjusting to dispensing device, transmitting element 50 these information of transmission.
If the judged result in the 3rd judging unit 303 is that then receiving system is not taked the downward modulation strategy to call bandwidth.
In order to reach network actual available bandwidth situation accuracy of judgement as far as possible, to obtain better user experience, the selected cell 30 in the receiving system can also comprise the 4th judging unit 304.
Wherein, the 4th judging unit 304 is used for the packet loss that obtains according to first acquiring unit 20, judges whether the actual available bandwidth of network is sufficient, if carry out the judgement in second judging unit 302.
A kind of receiving system that the embodiment of the invention provides just is not applicable to the environment with dispensing device and two data passages, and according to the information of revising in the receiving system that presets, this receiving system goes for having with dispensing device the situation of a plurality of data channel.
Explanation by above a kind of receiving system that the embodiment of the invention is provided, this receiving system can be according to the statistics of the packet that obtains, the adjustment strategy that judgement is taked each bandwidth chahnel of dispensing device transmission data, this receiving system can obtain dispensing device is sent the adjusted value of each bandwidth chahnel of data.
At last, need to prove that selected cell 30, second acquisition unit 30 in this receiving system can be transferred to dispensing device, realize the adjustment of each bandwidth chahnel the transmission data of self by dispensing device.
Embodiment five, and a kind of communication system referring to shown in Figure 7, comprising: receiving system 80 and dispensing device 90.
Wherein, receiving system 80, be used for the packet that transmission and reception apparatus sends, obtain the statistics of the packet that receives, this statistics comprises the packet loss of packet at least, according to the statistics of the packet that obtains and the information that presets, selection sends the modulation strategy of each bandwidth chahnel employing of data to dispensing device, according to the modulation strategy of selecting, obtain the adjustment numerical value that dispensing device is sent each bandwidth chahnel of data, the adjustment bandwidth of obtaining is sent to dispensing device 90;
Wherein, need to prove that receiving system 80 can be the receiving system that provides among the embodiment four.
A kind of communication system that adopts the embodiment of the invention five to provide, dispensing device 90 is to sending packet receiving system 90,90 statistics according to the packet that obtains are adorned in reception, the adjustment strategy that judgement is taked each bandwidth chahnel of dispensing device transmission data, this receiving system can obtain dispensing device is sent the adjusted value of each bandwidth chahnel of data, make this system can realize adjusting automatically code rate, better user experience is provided for the receiving terminal user.
Embodiment six, a kind of encoder, and this encoder comprises: second receiving element, first selected cell, the 3rd acquiring unit and coding unit.Wherein, second receiving element, first selected cell, the 3rd acquiring unit, coding unit are corresponding similar with receiving element 10, first acquiring unit 20, selected cell 30, second acquisition unit 40 among the embodiment four, and it specifies the explanation in can reference example four;
Need to prove that also coding unit is used for the adjustment numerical value to each bandwidth chahnel that obtains according to described, encodes.
Wherein, need to prove also that first selected cell further comprises: the 5th judging unit, the 6th judging unit, the 7th judging unit and the 8th judging unit.
Four judging units more than telling about, corresponding similar with first, second, third and fourth judging unit among the embodiment four, can be with reference to the explanation among the embodiment four.
A kind of encoder that the embodiment of the invention provides can be according to the statistical information of the packet that receives, and obtain the rate value of self coding, has realized that encoder adjusts the code rate of dispensing device automatically, for the receiving terminal user provides better user experience.
More than method, receiving system and the communication system of a kind of automatic adjustment code rate that the embodiment of the invention provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (17)
1, a kind of method of automatic adjustment code rate is characterized in that, comprising:
The packet that transmission and reception apparatus sends;
Obtain the statistical information of described packet, described statistical information comprises packet loss at least;
According to the statistical information of the described packet that obtains, select dispensing device is sent the adjustment strategy of each bandwidth chahnel employing of data;
According to the described information of adjusting strategy and presetting, obtain adjustment numerical value to described each bandwidth chahnel;
The information that sends described adjustment numerical value is to dispensing device.
2, method according to claim 1 is characterized in that, described statistical information according to the described packet that obtains is selected the adjustment strategy to each bandwidth chahnel employing of dispensing device transmission data, specifically comprises:
According to the described packet loss that obtains, judge whether to reduce the call bandwidth that sends data, described call bandwidth be described each bandwidth chahnel and, if, judge whether the last bandwidth of adjusting is to raise call bandwidth, if each bandwidth chahnel that sends data is adjusted into preceding each bandwidth chahnel that once sends data of described last modulation bandwidth.
3, method according to claim 1 is characterized in that, described statistical information according to the described packet that obtains is selected the adjustment strategy to each bandwidth chahnel employing of dispensing device transmission data, specifically comprises:
According to the described packet loss that obtains, judge whether to reduce the call bandwidth that sends data, described call bandwidth be described each bandwidth chahnel and, if, judge whether the last bandwidth of adjusting is to raise call bandwidth, if not, selects downward modulation to send the strategy of each bandwidth chahnel of data.
According to claim 1 or 3 described methods, it is characterized in that 4, each passage that described dispensing device sends data comprises: voice data passage and at least one video data channel;
Describedly obtain adjustment numerical value, specifically comprise described each bandwidth chahnel according to the described information of adjusting strategy and presetting:
According to the statistical information of the described packet that obtains, calculate the current actual available bandwidth of network;
Be numerical value and each data channel bandwidth that presets and be the information of the current actual available bandwidth of described network according to the described voice data bandwidth chahnel of the maintenance of presetting, calculate described video data channel bandwidth.
5, method according to claim 1 is characterized in that, described statistical information according to the described packet that obtains is selected the adjustment strategy to each bandwidth chahnel employing of dispensing device transmission data, specifically comprises:
According to the described packet loss that obtains, judge whether to reduce the call bandwidth that sends data, described call bandwidth be described each bandwidth chahnel and, if not, judge whether dispensing device reduced the bandwidth of each data channel, if select rise to send the strategy of each bandwidth chahnel of data.
6, method according to claim 5, it is characterized in that, described according to the described packet loss that obtains, judge whether to reduce the call bandwidth that sends data for not the time when described, describedly judge that whether dispensing device was reduced before the bandwidth of each data channel, also comprised:
According to the packet loss that obtains, when determining that the actual available bandwidth of network is sufficient, carry out and describedly judge whether dispensing device reduced the bandwidth of each data channel.
According to claim 1,5,6 each described methods, it is characterized in that 7, each passage that described dispensing device sends data comprises: voice data passage and at least one video data channel;
Describedly obtain adjustment numerical value, specifically comprise described each bandwidth chahnel according to the described information of adjusting strategy and presetting:
According to the statistical information of the described packet that obtains, calculate the call bandwidth that dispensing device sends data, described call bandwidth be described each bandwidth chahnel and;
Be the numerical value that presets and raise the information of described video data channel bandwidth according to the described voice data bandwidth chahnel of the maintenance of presetting, calculate the bandwidth of described video data channel to the value that presets.
8, a kind of receiving system is characterized in that, comprising:
Receiving element is used for the packet that transmission and reception apparatus sends;
First acquiring unit is used to obtain the statistical information of described packet, and described statistical information comprises packet loss at least;
Selected cell is used for the statistical information according to the described packet that obtains, and selects the adjustment strategy that each bandwidth chahnel of described dispensing device transmission data is taked;
Second acquisition unit is used for obtaining the adjustment numerical value to described each bandwidth chahnel according to described strategy and the information that presets adjusted;
Transmitting element is used to send the information of described adjustment numerical value to dispensing device.
9, receiving system according to claim 8 is characterized in that, described selected cell comprises:
First judging unit is used for the statistical information according to the described packet that obtains, and judges whether to reduce the call bandwidth that sends data;
Second judging unit, be used for according to first judging unit for negate as a result the time, judge whether dispensing device reduced call bandwidth.
10, receiving system according to claim 9 is characterized in that, described selected cell also comprises:
The 3rd judging unit is used for being judged as when being when first judging unit, judges whether the last bandwidth of adjusting is to raise call bandwidth.
11, according to claim 9 or 10 described receiving systems, it is characterized in that described selected cell also comprises:
The 4th judging unit is used for the statistical information according to the described packet that obtains, and judges whether the actual available bandwidth of network is sufficient, sends to second judging unit with being judged as the result who is.
12, a kind of communication system is characterized in that, comprising:
Receiving system, be used for the packet that transmission and reception apparatus sends, obtain the statistical information of described packet, described statistical information comprises packet loss at least, according to the statistical information of the described packet that obtains, select dispensing device is sent the adjustment strategy of each bandwidth chahnel employing of data, according to the described information of adjusting strategy and presetting, obtain the adjustment numerical value to described each bandwidth chahnel, the information that sends described adjustment numerical value is to dispensing device;
Dispensing device is used to send packet to receiving system, obtains the information of the adjustment bandwidth of receiving system transmission, according to the information of the adjustment bandwidth that gets access to, adjusts each bandwidth chahnel that sends data.
13, communication system according to claim 12, it is characterized in that, described dispensing device also is used to obtain the statistical information of described packet, described statistical information comprises packet loss at least, statistical information according to the described packet that obtains, selection according to the described information of adjusting strategy and presetting, is obtained the adjustment numerical value to described each bandwidth chahnel to the adjustment strategy of each bandwidth chahnel employing of dispensing device transmission data.
14, a kind of encoder is characterized in that, comprising:
Second receiving element is used to receive the statistical information of packet, and described statistical information comprises packet loss at least;
First selected cell is used for the statistical information according to the described packet that obtains, and selects the adjustment strategy that each bandwidth chahnel of described dispensing device transmission data is taked;
The 3rd acquiring unit is used for obtaining the adjustment numerical value to described each bandwidth chahnel according to described strategy and the information that presets adjusted;
Coding unit is used for the adjustment numerical value to each bandwidth chahnel that obtains according to described, encodes.
15, encoder according to claim 14 is characterized in that, described first selected cell comprises:
The 5th judging unit is used for the statistical information according to the described packet that obtains, and judges whether to reduce the call bandwidth that sends data;
The 6th judging unit, be used for according to the 5th judging unit for negate as a result the time, judge whether dispensing device reduced call bandwidth.
16, encoder according to claim 15 is characterized in that, described selected cell also comprises:
The 7th judging unit is used for being judged as when being when the 5th judging unit, judges whether the last bandwidth of adjusting is to raise call bandwidth.
17, according to claim 15 or 16 described encoders, it is characterized in that described selected cell also comprises:
The 8th judging unit is used for the statistical information according to the described packet that obtains, and judges whether the actual available bandwidth of network is sufficient, sends to the 6th judging unit with being judged as the result who is.
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