CN102547206A - Method and device for determining video transmission parameter during video communication - Google Patents
Method and device for determining video transmission parameter during video communication Download PDFInfo
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Abstract
The invention discloses a method and a device for determining a video transmission parameter during video communication. The main technical scheme is that the method comprises the following steps of: determining a transmission packet loss rate in the current time period during video communication; when the transmission packet loss rate is determined to be not in a set threshold value range, determining a network bandwidth of the next time period according to the transmission packet loss rate of the current time period and the network bandwidth of the current time period; determining the video transmission parameter corresponding to the network bandwidth of the next time period according to a stored corresponding relationship between the network bandwidth and the video transmission parameter; and determining the determined video transmission parameter as the video transmission parameter for the video communication in the next time period. According to the technical scheme, the accuracy for adjusting the video transmission parameter during the video communication can be improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to video transmission determination method for parameter and device in a kind of video communication process.
Background technology
Along with the rapid growth of IP (Internet protocol, the Internet Protocol) network bandwidth, make that the high-quality video data of transmission becomes a reality on IP network.But because factors such as the network bandwidth, transmission quality cause network condition unstable.Thereby existing transmission network is difficult to guarantee video communication, particularly real-time is required the communication quality than higher video communication.Therefore, in the video communication process, be the key that guarantees video communication quality to the adjustment of video communication parameter according to the actual bandwidth of network.
Prior art has proposed a kind of method of dynamic adjustment video transmission, and the main technical principle of this method comprises:
The initiator of video communication and recipient set up the talkie trunk road; Initiator and recipient detect separately peripheral capabilities (as whether supporting audio frequency, video etc.) simultaneously; Allow following time of condition of video transmission at the network bandwidth, the video communication both sides select vision signal to begin conversation, with the video window of this moment and transmission rate as benchmark; Send the service quality test pack, the transmission packet loss of test network; And, dynamically adjust the size of video window and transmission rate according to the size of transmitting packet loss.Wherein, based on the size of transmission packet loss, the process of size of dynamically adjusting video window and transfer rate is following:
When transmission packet loss＜5%, then suitably increase transmission rate or transfer big video window;
When transmitting packet loss between 5%-20%, it is constant with the transmission frame number then to keep current video window;
When transmitting packet loss, then turn video window and transmission frame number down more than 20%;
When the transmission packet loss greater than 30% the time, then finish conversation.
According to above technical scheme; Can simply adjust the video window and the transmission frame number of video communication according to the transmission packet loss; But according to technique scheme; Can only determine adjustment mode according to the transmission packet loss, promptly increase, keep current or turn down, but can not confirm the specifically adjustment amount when video window is adjusted with the transmission frame number video window and transmission frame number.Therefore; Based on prior art video window and transmission frame number are adjusted; Incompatible with the network environment of reality to a great extent; There is the adjustment error; For example, when the adjustment mode is big for transferring, because adjustment video window and transmission frame number increase too many; The actual transmissions scarce capacity of current network can cause transmitting the increase of packet loss on the contrary to satisfy adjusted video window and transmission during frame number.
In sum, prior art accuracy to the adjustment of video transmission parameter in the video communication process is low.
Summary of the invention
In view of this, the embodiment of the invention provides video transmission determination method for parameter and device in a kind of video communication process, adopts this technical scheme, can improve in the video communication process accuracy to the adjustment of video transmission parameter.
The embodiment of the invention realizes through following technical scheme:
An aspect according to the embodiment of the invention provides video transmission determination method for parameter in a kind of video communication process, comprising:
In the video communication process, confirm the transmission packet loss of current slot;
When definite said transmission packet loss is not in the setting threshold scope,, confirm the network bandwidth of next time period according to the transmission packet loss of current slot and the network bandwidth of current slot; And
According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, confirm the video transmission parameter corresponding with the network bandwidth of said next time period; And
The said video transmission parameter of determining is confirmed as the video transmission parameter that next time period carries out video communication.
According to another aspect of the embodiment of the invention, video transmission Determination of Parameters device in a kind of video communication process also is provided, comprising:
The transmission packet loss is confirmed the unit, is used in the video communication process, confirms the transmission packet loss of current slot;
The video transmission parameter is confirmed the unit; Be used for when said transmission packet loss confirms that the definite transmission packet loss in unit is not in said setting threshold scope; According to the transmission packet loss of current slot and the network bandwidth of current slot, confirm the network bandwidth of next time period; According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, confirm the video transmission parameter corresponding with the network bandwidth of said next time period; And the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication.
Above-mentioned at least one technical scheme that provides through the embodiment of the invention; In the video communication process; At first confirm the transmission packet loss of current slot; When confirming that this transmission packet loss is not in the setting threshold scope,, confirm the network bandwidth of next time period according to the transmission packet loss of current slot and the network bandwidth of current slot; And according to the network bandwidth of preserving and the corresponding relation of video transmission parameter, definite video transmission parameter corresponding with the network bandwidth of next time period confirmed as the video transmission parameter that next time period carries out video communication with this video transmission parameter of determining.According to this technical scheme; When confirming to need next time period of adjustment to carry out the video transmission parameter of video communication; Can determine the network bandwidth of next time period according to the transmission packet loss and the network bandwidth of current slot, and the video transmission parameter of selecting suitable video transmission parameter to carry out video communication as next time period according to this network bandwidth; Thereby can adapt to actual network environment better, improve accuracy the adjustment of video transmission parameter.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become apparent, perhaps understand by embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with the embodiment of the invention, is not construed as limiting the invention.In the accompanying drawings:
Video transmission determination method for parameter flow chart in the video communication process that Fig. 1 provides for the embodiment of the invention one;
Fig. 2 provides the flow chart of the network bandwidth of fixing a time period really for the embodiment of the invention one;
The flow chart of the opening of the data communication card in the terminal of video communication is carried out in the control that Fig. 3 provides for the embodiment of the invention one;
The terminal sketch map of the video communication that Fig. 4 provides for the embodiment of the invention one;
Relation curve sketch map between transmission packet loss x that Fig. 5 provides for the embodiment of the invention one and the prediction bandwidth y;
Video transmission Determination of Parameters device sketch map in the video communication process that Fig. 6 provides for the embodiment of the invention two.
Embodiment
In order to provide raising implementation to the accuracy of the adjustment of video transmission parameter in the video communication process; The embodiment of the invention provides video transmission determination method for parameter and device in a kind of video communication process; Below in conjunction with Figure of description the preferred embodiments of the present invention are described; Should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.And under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Embodiment one
According to the embodiment of the invention one, video transmission determination method for parameter in a kind of video communication process is provided, through this method, can improve in the video communication process accuracy to the adjustment of video transmission parameter.
The video transmission determination method for parameter is mainly implemented in the video transmission process in the video communication process that the embodiment of the invention one provides, and is specifically shown in Figure 1, comprises the steps:
In this step 103, at the transmission packet loss in the setting threshold scope time, then need not to adjust the video transmission parameter that next time period carries out video communication, proceed video communication according to current video transmission parameter.
In the described flow process of Fig. 1, the video transmission parameter can comprise resolution and the code check that carries out video transmission.
In the embodiment of the invention one; In order to realize flow process shown in Figure 1; Preestablished the corresponding relation of the network bandwidth and video transmission parameter, in this corresponding relation, to many groups video transmission parameter of video communication process; Be provided with respectively and can satisfy the needed network bandwidth of this video transmission parameter, this corresponding relation specifically can be as shown in the table:
In the flow process of Fig. 1 correspondence, in the step 104, confirm the mode of the network bandwidth of current slot, comprising:
According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, the corresponding network bandwidth of video transmission parameter that definite and current slot carry out video communication is the network bandwidth of current slot.
For example; Corresponding relation based on the network bandwidth shown in the last table and video transmission parameter; Suppose that the video transmission parameter that current slot carries out video communication is that resolution is that CIF, code check are 512kbps, the network bandwidth that then can confirm current slot is 512kbps.
The embodiment of the invention one also provides the preferred implementation of the step 104 of the corresponding flow process of Fig. 1; Promptly according to the transmission packet loss of current slot and the network bandwidth of current slot; Confirm the implementation procedure of the network bandwidth of next time period, specifically as shown in Figure 2, comprise the steps:
Through the corresponding flow process of Fig. 2; Can be according to the transmission packet loss and the network bandwidth of current slot; Confirm the network bandwidth of next time period; And the flow process that Fig. 2 is corresponding is considered the practical communication ability of data communication card built-in in the terminal of carrying out video communication, promptly at the network bandwidth of next time period of determining according to the transmission packet loss and the network bandwidth of current slot; During greater than the corresponding maximum bandwidth of data communication card built-in in the terminal, the network bandwidth of next time period is adjusted into the corresponding maximum bandwidth of data communication card built-in in the terminal.
The embodiment of the invention one also provides the preferred implementation of the step 201 of the corresponding flow process of Fig. 2, particularly, according to the transmission packet loss of current slot, confirms dull coefficient, can be through following process:
If the transmission packet loss of current slot is greater than the higher limit of this setting threshold scope, then with 1 deduct current slot the value that obtains of transmission packet loss confirm as dull coefficient;
If the transmission packet loss of current slot is less than the lower limit of this setting threshold scope; The transmission packet loss of then confirming current slot deduct first set the difference that constant obtains inverse; Should inverse and second set the constant sum and confirm as dull coefficient; Wherein, first sets constant more than or equal to the 0 transmission packet loss less than current slot, and second to set constant be first to set the difference of bandwidth increment rate of inverse and the setting of constant.
In the preferred implementation that the embodiment of the invention one provides; In order to increase the communication capacity of video communication terminal; Can built-in one or more data communication cards in the communication terminal that carries out video communication; An if built-in data communication card; Then the built-in corresponding maximum bandwidth of data communication card is the maximum bandwidth that this data communication card is supported in the terminal, if built-in a plurality of data communication cards, then the built-in corresponding maximum bandwidth of data communication card is the maximum bandwidth sum that these a plurality of data communication cards are supported in the terminal.
Further; In the preferred implementation that the embodiment of the invention one provides, at the terminal of carrying out video communication during built-in a plurality of data communication card, in order to guarantee effective utilization of data communication card; The open and close of data communication card are confirmed according to the needed network bandwidth; In order to realize this purpose, the embodiment of the invention has preestablished the corresponding relation of the unlatching quantity of the network bandwidth and data communication card, and the concrete assignment procedure of this corresponding relation is following:
At first confirm the maximum network bandwidth that each data communication card is corresponding;
If network bandwidth B is greater than the maximum network bandwidth sum greater than N-1 data communication card correspondence, and less than the corresponding maximum network bandwidth sum of N data communication card, the unlatching quantity of the data communication card that then definite this network bandwidth B is corresponding is N.
The corresponding relation of the network bandwidth that provides according to the embodiment of the invention and the unlatching quantity of data communication card is as shown in the table, and wherein, the maximum network bandwidth that each data communication card is corresponding is 2Mbps:
| The network bandwidth (unit: kbps) | 512 | 1M | 2M | 2M | 3M | 4M | 4M |
| The unlatching quantity of |
1 | 1 | 1 | 1 | 2 | 2 | 2 |
Further, in the practical application, exist under the situation of a plurality of data communication cards; For the fluctuation that reduces owing to the network bandwidth causes the frequency of data communication card is closed; Can set the priority of each data communication card, when needs increase the quantity of data communication card, preferentially open the high data communication card of priority; When needs are closed data communication card, preferentially close the low data communication card of priority.For example, the priority of communication card T0 is higher than the priority of communication data communication card T1, and then above-mentioned corresponding relation can also comprise the data communication card numbering of preferential unlatching, specifically can be as shown in the table:
Corresponding relation based on the unlatching quantity of the above network bandwidth and data communication card; In the preferred embodiment of the present invention; After confirming the network bandwidth of next time period through above-mentioned flow process; Also need further control to carry out the opening of the data communication card in the terminal of video communication, specifically as shown in Figure 3, this process mainly comprises the steps:
The unlatching quantity of the data communication card that step 302, basis are determined, control are carried out the terminal of video communication and are opened and the corresponding data communication card of determining of quantity.
So far, the flow process of controlling the opening of the data communication card in the terminal of carrying out video communication finishes.
In the step 302 of the corresponding flow process of Fig. 3, concrete control procedure is following:
If the video communication card quantity that the unlatching quantity of the data communication card of determining has been opened greater than the terminal of carrying out video communication; Then need open the data communication card that is in closed condition at present; The video communication card quantity that open at feasible terminal of carrying out video communication equates with the unlatching quantity of the data communication card of determining, with the quality that guarantees that video communication is carried out at next time period terminal;
If the video communication card quantity that the unlatching quantity of the data communication card of determining has been opened less than the terminal of carrying out video communication; Then need close the data communication card that is in opening at present; The video communication card quantity that open at feasible terminal of carrying out video communication equates with the unlatching quantity of the data communication card of determining, to guarantee effective utilization of data communication card.
If the unlatching quantity of the data communication card determined equals to carry out the video communication card quantity that has opened at the terminal of video communication, then need not to adjust the unlatching of data communication card or close.
The above flow process can be carried out in the starting stage of video communication, promptly after setting up the video communication connection, adjusted through this mode.
On the basis of above embodiment, the embodiment of the invention has proposed another preferred implementation, and is specific as follows:
This preferred implementation was considered in the video communication starting stage; Because the actual network bandwidth need reflect according to the transmission packet loss; Therefore in the starting stage of video communication, carry out the examination adjustment process (describe for convenient, this process is called the coarse adjustment process of video transmission parameter in the subsequent implementation example) of video transmission parameter; Behind basic definite actual network bandwidth; Just carry out above-mentioned video transmission parameter adjustment process (describe for convenient, this process is called the fine tuning process of video transmission parameter in the subsequent implementation example), thereby improve adjustment efficient.
According to the preferred embodiment, behind basic definite actual network bandwidth, just carry out the fine tuning process of above-mentioned video transmission parameter; Promptly before carrying out above-mentioned steps 104; If confirm to satisfy following condition, then carry out this step 104, otherwise carry out the coarse adjustment process of looking the video transmission parameter.
Particularly, before carrying out above-mentioned steps 104, confirm that the condition that needs to satisfy comprises:
The transmission packet loss of confirming a last time period is in the setting threshold scope.If satisfy this condition; Think that then the network bandwidth that carries out video communication is comparatively stable; Can adopt the video transmission parameter of carrying out video communication of above-mentioned fine tuning process next time period of adjustment,, think that then the network bandwidth that carries out video communication is unstable if do not satisfy this condition; Be the starting stage of video communication, need to adopt the coarse adjustment process of video parameter this moment.
Perhaps
The transmission packet loss of confirming a lasted time period not in the setting threshold scope and on the time period video transmission parameter of carrying out video communication reach the video transmission parameter that the maximum bandwidth of all built-in data communication cards correspondences of the terminal of carrying out video communication can be carried.
If do not satisfy above-mentioned condition; Then carry out the coarse regulation process of video transmission parameter; Promptly on confirming the transmission packet loss of a time period not in the setting threshold scope and on the time period video transmission parameter of carrying out video communication do not reach the video transmission parameter that the built-in corresponding maximum bandwidth of all data communication cards in terminal of carrying out video communication can be carried, the coarse regulation process of execution video transmission parameter.
The coarse regulation process of video transmission parameter particularly, comprises:
If the transmission packet loss of current slot is greater than the higher limit of setting threshold scope; Then respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is lower than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the video transmission parameter of determining is confirmed as the video transmission parameter that next time period carries out video communication;
If the transmission packet loss of current slot is less than the lower limit of setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is higher than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the video transmission parameter of determining is confirmed as the video transmission parameter that next time period carries out video communication.
For the ease of realizing said process; Can be in advance according to each group video transmission parameter setting code level; Can be according to each video transmission parameter configuration, be each video transmission parameter allocated code rank the end of by to height according to configuration, it is low more to dispose low more video transmission parameter corresponding codes rank; For example, can explain this corresponding relation through following table:
Last table is merely a kind of coded system that realizes in the embodiment of the invention; In the practical application; Can also be according to being each video transmission parameter allocated code rank from high to low according to configuration, it is low more to dispose high more video transmission parameter corresponding codes rank, gives an example no longer one by one here.
Further; After confirming that through the coarse adjustment process of video parameter next time period carries out the video transmission parameter of video communication; Also need further control to carry out the opening of the data communication card in the terminal of video communication; To carry out the process of opening of the data communication card in the terminal of video communication consistent in control in the fine tuning process of concrete control procedure and above-mentioned video parameter, and this process through the flow process detailed description of above-mentioned Fig. 3 and correspondence, repeats no more here.
Through above embodiment, describe video transmission determination method for parameter in the video communication process that the embodiment of the invention one provides in detail, describe below in conjunction with the concrete technical scheme that further this embodiment is provided of using.
The embodiment that the embodiment of the invention one provides is following:
As shown in Figure 4, the terminal of carrying out video communication transmits and receives module 402 two parts by video encoding module 401 and signal and forms; Wherein, signal transmit and receive module 402 can external T
0, T
1... T
N-1Be total to N parallel data communication card, the data communication card that sequence number is little has higher use priority relatively, can preferentially open and close at last, and the largest data transfer ability of each data communication card is m Mbytes/s.
Before transmitting at every turn; Need confirm the transmittability of current IP network; And then the code check of adaptive adjustment encoder output video encoding stream and resolution (being the video transmission parameter), and the quantity of opening according to this code check and resolution specified data communication card.
Transmittability with N=4, each data communication card is that 2Mbytes/s is an example, code level to compile and edit method as shown in the table:
In the last table, the unit of the code check and the network bandwidth is kbps.
According to the described corresponding relation of last table, adopt 12 code level, 0 grade of video transmission parameter configuration that correspondence is minimum wherein, 11 grades of video transmission parameter configuration that correspondence is the highest.When data communication card increased, network possesses the overall transfer ability also can correspondingly be increased, so the also corresponding increase of code level sum.
According to the corresponding relation shown in the last table, in the starting stage of video communication, the process that the video transmission parameter is adjusted is following:
1, the video encoding module output sample being set is that CIF (352 * 288, send through 1 data communication card, comes the test network situation through the transmission packet loss that feeds back, if that is: the transmission packet loss is less than a by 512kbps) video encode stream
1(for example, can select a
1=0.1%), then jumps into step 2; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Only open and be numbered T this moment
0Data communication card, other data communication card is closed.
2, the CIF of adjusting video encoding module output sample (352 * 288, send through 1 data communication card, comes the test network situation through the transmission packet loss that feeds back, if that is: the transmission packet loss is less than a by 1Mbps) video encode stream
1, then jump into step 3; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Only open and be numbered T this moment
0Data communication card, other data communication card is closed.
3, the CIF of adjusting video encoding module output sample (352 * 288, send through 1 data communication card, comes the test network situation through the transmission packet loss that feeds back, if that is: the transmission packet loss is less than a by 2Mbps) video encode stream
1, then jump into step 4; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Only open and be numbered T this moment
0Data communication card, other data communication card is closed.
4, regulate 576i (2Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 2 data communication cards
1, then jump into step 5; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0And T
1Data communication card, other data communication card is closed.
5, regulate 576i (3Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 2 data communication cards
1, then jump into step 6; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0And T
1Data communication card, other data communication card is closed.
6, regulate 576i (4Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 2 data communication cards
1, then jump into step 7; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0And T
1Data communication card, other data communication card is closed.
7, regulate 720p (4Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 3 data communication cards
1, then jump into step 8; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0, T
1And T
2Data communication card, other data communication card is closed.
8, regulate 720p (5Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 3 data communication cards
1, then jump into step 9; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0, T
1And T
2Data communication card, other data communication card is closed.
9, regulate 720p (6Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 3 data communication cards
1, then jump into step 10; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0, T
1And T
2Data communication card, other data communication card is closed.
10, regulate 720p (7Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 3 data communication cards
1, then jump into step 11; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.Open this moment and be numbered T
0, T
1And T
2Data communication card, other data communication card is closed.
11, regulate 720p (8Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 4 data communication cards
1, then jump into step 12; If the transmission packet loss is greater than a
1, then to transmit with present encoding code check and resolution, follow-up fine tuning process according to the video transmission parameter is adjusted.This moment, all data communication cards were all opened.
12, regulate 1080i (8Mbps) video encode stream of video encoding module output sample, send, come the test network situation, if that is: the transmission packet loss is less than a through the transmission packet loss that feeds back through 4 data communication cards
1, then according to existing code check and resolution transmission, all data communication cards are held open; If the transmission packet loss is greater than a
1, then get into the fine tuning process of video transmission parameter.
In the above-mentioned flow process, acceptable transmission packet loss scope is a when carrying out video transmission
1～a
2, because this flow process begins adjustment from code level 0, i.e. the minimum rank of video transmission parameter begins, the general networking bandwidth can both satisfy this video transmission parameter, therefore, is transmitting packet loss less than a
1The time, be adjusted into next code level, if the transmission packet loss is greater than a
1, then do not adjust, here owing to be to adjust the video transmission parameter step by step, adjusting range is less, and therefore, the default transport packet loss is greater than a
1The time also less than a
2In the practical application, also can begin adjustment from maximum code level, if begin adjustment from maximum code level, then can be at the transmission packet loss greater than a
2The time, be adjusted into last code level, if the transmission packet loss is less than a
2, then do not adjust, in like manner, owing to be to adjust the video transmission parameter step by step, adjusting range is less, and therefore, the default transport packet loss is less than a
2The time also greater than a
1Can not begin adjustment, if the transmission packet loss is greater than a from intergrade yet
2The time, be adjusted into last code level, if the transmission packet loss is less than a
1, then be adjusted into next code level, otherwise do not adjust.In the practical application, can adjust flexibly, enumerate no longer one by one here based on actual conditions.
In the above flow process, when the increase of data communication card number and when the transmittability of a data communication card increases, the coarse adjustment method still according to judging from code level 0～the highest code level, is debugged the Network Transmission bandwidth segments an of the best.Concrete determining step still can be with reference to shown in above 12 steps, and different is, when the code level sum increases, and the step that we also can corresponding increase judge according to the transmission packet loss; When the code level sum reduced, we also can reduce the step of judging according to the transmission packet loss accordingly.
After the coarse adjustment process according to above video transmission parameter got into the fine tuning process of video transmission parameter, the fine tuning process of this video transmission parameter was following:
1, when transmitting packet loss x less than a
1(for example, a
1=0.1%) time, can confirm that communication link layer is in proper working order this moment, and the current network transmittability does not make full use of; Can attempt improving transmission bandwidth, need to use the higher bit-rate video encoding stream of coding module output, be dull relation for transmitting between packet loss x and the prediction bandwidth y; Because when the transmission packet loss is higher; The network bandwidth of corresponding increase can be less, and the amplitude of increase is also slower, when the transmission packet loss approaches 0; The network bandwidth of corresponding increase can be more, and the amplitude of increase is also very fast.At this moment, the Mathematical Modeling that adopts between transmission packet loss x and the prediction bandwidth y can the preference curve relationship description;
2, when transmitting packet loss x greater than a
1Simultaneously less than a
2(for example, a
2=1%) time, can confirm that communication link layer is in proper working order this moment, and application layer also obtains rational Application, and the current network transmittability is rationally utilized, and need not adjust the code check of coding module output video encoding stream; At this moment, the Mathematical Modeling that adopts between transmission packet loss x and the prediction bandwidth y preferably linear relation is described, and derivative is 0;
3, when transmitting packet loss x greater than a
2The time; Can assert the communication link layer operation irregularity this moment; Can not reconcile solve problem through application layer, the current network transmittability can not satisfy current transmission requirements, needs to use coding module to export more low bit-rate video encoding stream; For between transmission packet loss x and the prediction bandwidth y for monotone decreasing concerns, promptly transmit the slip that packet loss equals code check.So this moment, we adopted the Mathematical Modeling of monotonic decreasing function as this moment.
The relation function that more than transmits packet loss x and prediction bandwidth y must possess the concrete numerical value that successional principle is confirmed next bandwidth constantly between the piecewise function of satisfied transmission packet loss x correspondence when different threshold intervals.Why consider that here it is because will rationally utilize network bandwidth resources that piecewise function will possess continuity, avoid waste as far as possible, if discontinuous may to abandon a part of selectable bandwidth interval the network bandwidth.Transmission packet loss x can be following with the relation function of prediction bandwidth y:
If current Network Transmission bandwidth is B, a
1=0.1%, a
2=1%, along with the variation of transmission packet loss x, next moment, our the Network Transmission bandwidth of prediction was y so, and then the relation between the two is following:
In the following formula, a and b are constant, are respectively:
Wherein, C is the bandwidth increment rate, can set according to real needs and concrete applied environment.Relation curve between transmission packet loss x and the prediction bandwidth y is as shown in Figure 5; Can find out transmission packet loss x and the relation of predicting bandwidth y according to this figure, wherein, transmit packet loss x less than 0.1% o'clock; The network bandwidth y of next time period of prediction is with the increase that reduces of x; And the amplitude that increases is bigger, and more than or equal to 0.1% smaller or equal to 1% o'clock, the network bandwidth y of next time period of prediction equals the current network bandwidth B at transmission packet loss x; Greater than 1% o'clock, the network bandwidth y of next time period of prediction reduced with the increase of x at transmission packet loss x.
Embodiment two
The embodiment of the invention two provides video transmission Determination of Parameters device in a kind of video communication process, through this device, can improve in the video communication process accuracy to the adjustment of video transmission parameter.
As shown in Figure 6, video transmission Determination of Parameters device in the video communication process that the embodiment of the invention two provides comprises:
The transmission packet loss confirms that unit 601 and video transmission parameter confirm unit 602;
Wherein:
The transmission packet loss is confirmed unit 601, is used in the video communication process, confirms the transmission packet loss of current slot;
The video transmission parameter is confirmed unit 602; The transmission packet loss that is used for confirming unit 601 to confirm at the transmission packet loss is not in said threshold range the time; According to the transmission packet loss of current slot and the network bandwidth of current slot, confirm the network bandwidth of next time period; According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, confirm the video transmission parameter corresponding with the network bandwidth of said next time period; And the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, specifically is used for:
According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, the corresponding network bandwidth of video transmission parameter that definite and current slot carry out video communication is the network bandwidth of current slot.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, specifically is used for:
According to the transmission packet loss of said current slot, confirm the monotone decreasing coefficient, and the product of the network bandwidth of definite current slot and said monotone decreasing coefficient;
Judge that whether said product is greater than the built-in corresponding maximum bandwidth of all data communication cards in the terminal of carrying out video communication;
If then that said data communication card is corresponding maximum bandwidth is confirmed as the network bandwidth of next time period;
If not, then said product is confirmed as the network bandwidth of next time period.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, specifically is used for:
If the transmission packet loss of current slot is greater than the higher limit of said setting threshold scope, then with 1 deduct said current slot the value that obtains of transmission packet loss confirm as the monotone decreasing coefficient;
If the transmission packet loss of current slot is less than the lower limit of said setting threshold scope; The transmission packet loss of then confirming said current slot deduct first set the difference that constant obtains inverse; Said inverse and second is set the constant sum confirm as the monotone decreasing coefficient; Wherein, said first sets constant more than or equal to the 0 transmission packet loss less than said current slot, the difference of the inverse that the said second setting constant is the said first setting constant and the bandwidth increment rate of setting.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, also comprises:
The data communication card control units; Be used for after said video transmission parameter confirms that the network bandwidth of next time period is confirmed in the unit; According to the corresponding relation of the unlatching quantity of the network bandwidth of preserving and data communication card, the unlatching quantity of definite data communication card corresponding with the network bandwidth of said next time period; And according to the unlatching quantity of the said data communication card of determining, control is carried out the terminal of video communication and is opened and the corresponding data communication card of determining of said quantity.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, also is used for:
According to the transmission packet loss of current slot and the network bandwidth of current slot, confirm before the network bandwidth of next time period that the transmission packet loss of confirming a last time period is in said setting threshold scope; Or the transmission packet loss of confirming a lasted time period not in said setting threshold scope and on the time period video transmission parameter of carrying out video communication reach the video transmission parameter that the maximum bandwidth of all built-in data communication cards correspondences of the terminal of carrying out video communication can be carried.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, also is used for:
On confirming the transmission packet loss of a time period not in said setting threshold scope and on after the time period video transmission parameter of carrying out video communication do not reach the video transmission parameter that the built-in corresponding maximum bandwidth of all data communication cards in terminal of carrying out video communication can carry; If the transmission packet loss of current slot is greater than the higher limit of said setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is lower than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication;
If the transmission packet loss of current slot is less than the lower limit of said setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is higher than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication.
In the preferred embodiment that the embodiment of the invention two provides, the video transmission parameter that device shown in Figure 6 comprises is confirmed unit 602, also is used for:
Determining after next time period carries out the video transmission parameter of video communication; According to the corresponding relation of the unlatching quantity of video transmission parameter of preserving and data communication card, definite and said next time period are carried out the unlatching quantity of the corresponding data communication card of the video transmission parameter of video communication; And according to the unlatching quantity of the said data communication card of determining, control is carried out the terminal of video communication and is opened and the corresponding data communication card of determining of said quantity.
In the preferred embodiment that the embodiment of the invention two provides; When the video transmission parameter that device shown in Figure 6 comprises confirmed that transmission packet loss that unit 602 also is used for confirming to confirm the unit at said transmission packet loss is in said setting threshold scope, it was consistent with the video transmission parameter that current slot carries out video communication to confirm that next time period is carried out the video transmission parameter of video communication.
Should be appreciated that the unit that video transmission Determination of Parameters device comprises in the above video communication process is merely the logical partitioning of carrying out according to the function of this device realization, in the practical application, can carry out the stack or the fractionation of said units.And video transmission determination method for parameter flow process is corresponding one by one in the function that video transmission Determination of Parameters device is realized in the video communication process that this embodiment two provides and the video communication process that the foregoing description one provides; The more detailed handling process that realizes for this device; In the foregoing description one, done detailed description, be not described in detail here.
Above-mentioned at least one technical scheme that provides through the embodiment of the invention; In the video communication process; At first confirm the transmission packet loss of current slot; If this transmission packet loss is in the setting threshold scope, the video transmission parameter that then definite next time period is carried out video communication is consistent with the video transmission parameter that current slot carries out video communication; If this transmission packet loss then according to the transmission packet loss of current slot and the network bandwidth of current slot, is confirmed the network bandwidth of next time period not in the setting threshold scope; And according to the network bandwidth of preserving and the corresponding relation of video transmission parameter, definite video transmission parameter corresponding with the network bandwidth of next time period confirmed as the video transmission parameter that next time period carries out video communication with this video transmission parameter of determining.According to this technical scheme; When confirming to need next time period of adjustment to carry out the video transmission parameter of video communication; Can determine the network bandwidth of next time period according to the transmission packet loss and the network bandwidth of current slot, and the video transmission parameter of selecting suitable video transmission parameter to carry out video communication as next time period according to this network bandwidth; Thereby can adapt to actual network environment better, improve accuracy the adjustment of video transmission parameter.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1. video transmission determination method for parameter in the video communication process is characterized in that, comprising:
In the video communication process, confirm the transmission packet loss of current slot;
When definite said transmission packet loss is not in the setting threshold scope,, confirm the network bandwidth of next time period according to the transmission packet loss of current slot and the network bandwidth of current slot; And
According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, confirm the video transmission parameter corresponding with the network bandwidth of said next time period; And
The said video transmission parameter of determining is confirmed as the video transmission parameter that next time period carries out video communication.
2. the method for claim 1 is characterized in that, definite mode of the network bandwidth of current slot comprises:
According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, the corresponding network bandwidth of video transmission parameter that definite and current slot carry out video communication is the network bandwidth of current slot.
3. the method for claim 1 is characterized in that, according to the transmission packet loss of current slot and the network bandwidth of current slot, confirms the network bandwidth of next time period, comprising:
According to the transmission packet loss of said current slot, confirm dull coefficient, and the product of the network bandwidth of definite current slot and said dull coefficient;
Judge that whether said product is greater than the built-in corresponding maximum bandwidth of all data communication cards in the terminal of carrying out video communication;
If then that said data communication card is corresponding maximum bandwidth is confirmed as the network bandwidth of next time period;
If not, then said product is confirmed as the network bandwidth of next time period.
4. method as claimed in claim 3 is characterized in that, according to the transmission packet loss of said current slot, confirms dull coefficient, comprising:
If the transmission packet loss of current slot is greater than the higher limit of said setting threshold scope, then with 1 deduct said current slot the value that obtains of transmission packet loss confirm as dull coefficient;
If the transmission packet loss of current slot is less than the lower limit of said setting threshold scope; The transmission packet loss of then confirming said current slot deduct first set the difference that constant obtains inverse; Said inverse and second is set the constant sum confirm as dull coefficient; Wherein, said first sets constant more than or equal to the 0 transmission packet loss less than said current slot, the difference of the inverse that the said second setting constant is the said first setting constant and the bandwidth increment rate of setting.
5. like claim 1 or 3 described methods, it is characterized in that, confirm the network bandwidth of next time period after, also comprise:
According to the corresponding relation of the unlatching quantity of the network bandwidth of preserving and data communication card, the unlatching quantity of definite data communication card corresponding with the network bandwidth of said next time period;
According to the unlatching quantity of the said data communication card of determining, control is carried out the terminal of video communication and is opened and the corresponding data communication card of determining of said quantity.
6. the method for claim 1 is characterized in that, according to the transmission packet loss of current slot and the network bandwidth of current slot, confirms also to comprise before the network bandwidth of next time period:
The transmission packet loss of confirming a last time period is in said setting threshold scope; Or
The transmission packet loss of confirming a lasted time period not in said setting threshold scope and on the time period video transmission parameter of carrying out video communication reach the video transmission parameter that the maximum bandwidth of all built-in data communication cards correspondences of the terminal of carrying out video communication can be carried.
7. method as claimed in claim 6 is characterized in that, also comprises:
On confirming the transmission packet loss of a time period not in said setting threshold scope and on the time period video transmission parameter of carrying out video communication when not reaching the video transmission parameter that the built-in corresponding maximum bandwidth of all data communication cards in terminal of carrying out video communication can carry; If the transmission packet loss of current slot is greater than the higher limit of said setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is lower than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication;
If the transmission packet loss of current slot is less than the lower limit of said setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is higher than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication.
8. method as claimed in claim 7 is characterized in that, is determining after next time period carries out the video transmission parameter of video communication, also comprises:
According to the corresponding relation of the unlatching quantity of video transmission parameter of preserving and data communication card, definite and said next time period are carried out the unlatching quantity of the corresponding data communication card of the video transmission parameter of video communication;
According to the unlatching quantity of the said data communication card of determining, control is carried out the terminal of video communication and is opened and the corresponding data communication card of determining of said quantity.
9. the method for claim 1 is characterized in that, also comprises:
When definite said transmission packet loss was in said setting threshold scope, it was consistent with the video transmission parameter that current slot carries out video communication to confirm that next time period is carried out the video transmission parameter of video communication.
10. video transmission Determination of Parameters device in the video communication process is characterized in that, comprising:
The transmission packet loss is confirmed the unit, is used in the video communication process, confirms the transmission packet loss of current slot;
The video transmission parameter is confirmed the unit; Be used for when said transmission packet loss confirms that the definite transmission packet loss in unit is not in the setting threshold scope; According to the transmission packet loss of current slot and the network bandwidth of current slot, confirm the network bandwidth of next time period; According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, confirm the video transmission parameter corresponding with the network bandwidth of said next time period; And the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication.
11. device as claimed in claim 10 is characterized in that, said video transmission parameter is confirmed the unit, specifically is used for:
According to the network bandwidth of preserving and the corresponding relation of video transmission parameter, the corresponding network bandwidth of video transmission parameter that definite and current slot carry out video communication is the network bandwidth of current slot.
12. device as claimed in claim 10 is characterized in that, said video transmission parameter is confirmed the unit, specifically is used for:
According to the transmission packet loss of said current slot, confirm dull coefficient, and the product of the network bandwidth of definite current slot and said dull coefficient;
Judge that whether said product is greater than the built-in corresponding maximum bandwidth of all data communication cards in the terminal of carrying out video communication;
If then that said data communication card is corresponding maximum bandwidth is confirmed as the network bandwidth of next time period;
If not, then said product is confirmed as the network bandwidth of next time period.
13. device as claimed in claim 12 is characterized in that, said video transmission parameter is confirmed the unit, specifically is used for:
If the transmission packet loss of current slot is greater than the higher limit of said setting threshold scope, then with 1 deduct said current slot the value that obtains of transmission packet loss confirm as dull coefficient;
If the transmission packet loss of current slot is less than the lower limit of said setting threshold scope; The transmission packet loss of then confirming said current slot deduct first set the difference that constant obtains inverse; Said inverse and second is set the constant sum confirm as dull coefficient; Wherein, said first sets constant more than or equal to the 0 transmission packet loss less than said current slot, the difference of the inverse that the said second setting constant is the said first setting constant and the bandwidth increment rate of setting.
14. like claim 10 or 12 described devices, it is characterized in that, also comprise:
The data communication card control units; Be used for after said video transmission parameter confirms that the network bandwidth of next time period is confirmed in the unit; According to the corresponding relation of the unlatching quantity of the network bandwidth of preserving and data communication card, the unlatching quantity of definite data communication card corresponding with the network bandwidth of said next time period; And according to the unlatching quantity of the said data communication card of determining, control is carried out the terminal of video communication and is opened and the corresponding data communication card of determining of said quantity.
15. device as claimed in claim 10 is characterized in that, said video transmission parameter is confirmed the unit, also is used for:
According to the transmission packet loss of current slot and the network bandwidth of current slot, confirm before the network bandwidth of next time period that the transmission packet loss of confirming a last time period is in said setting threshold scope; Or the transmission packet loss of confirming a lasted time period not in said setting threshold scope and on the time period video transmission parameter of carrying out video communication reach the video transmission parameter that the maximum bandwidth of all built-in data communication cards correspondences of the terminal of carrying out video communication can be carried.
16. device as claimed in claim 15 is characterized in that, said video transmission parameter is confirmed the unit, also is used for:
On confirming the transmission packet loss of a time period not in said setting threshold scope and on after the time period video transmission parameter of carrying out video communication do not reach the video transmission parameter that the built-in corresponding maximum bandwidth of all data communication cards in terminal of carrying out video communication can carry; If the transmission packet loss of current slot is greater than the higher limit of said setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is lower than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication;
If the transmission packet loss of current slot is less than the lower limit of said setting threshold scope; Respectively organize the video transmission parameter according to what preserve; Confirm that the video transmission parameter configuration is higher than current slot and carries out the video transmission parameter configuration of video communication and differ minimum video transmission parameter, and the said video transmission parameter that will determine is confirmed as the video transmission parameter that next time period carries out video communication.
17. device as claimed in claim 16 is characterized in that, said video transmission parameter is confirmed the unit, also is used for:
Determining after next time period carries out the video transmission parameter of video communication; According to the corresponding relation of the unlatching quantity of video transmission parameter of preserving and data communication card, definite and said next time period are carried out the unlatching quantity of the corresponding data communication card of the video transmission parameter of video communication; And according to the unlatching quantity of the said data communication card of determining, control is carried out the terminal of video communication and is opened and the corresponding data communication card of determining of said quantity.
18. device as claimed in claim 10; It is characterized in that; Said video transmission parameter is confirmed the unit; The transmission packet loss that also is used for confirming to confirm the unit at said transmission packet loss is in said setting threshold scope the time, and it is consistent with the video transmission parameter that current slot carries out video communication to confirm that next time period is carried out the video transmission parameter of video communication.
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