CN102088395A - Method and device for adjusting media data cache - Google Patents
Method and device for adjusting media data cache Download PDFInfo
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- CN102088395A CN102088395A CN2009102414528A CN200910241452A CN102088395A CN 102088395 A CN102088395 A CN 102088395A CN 2009102414528 A CN2009102414528 A CN 2009102414528A CN 200910241452 A CN200910241452 A CN 200910241452A CN 102088395 A CN102088395 A CN 102088395A
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Abstract
The invention provides a method and device for adjusting a media data cache. The method comprises the following steps of: detecting the occupancy rate of a media cache queue; and dynamically adjusting the occupation situation of a shared cache by the media cache queue according to a detected situation. By using the method and the device, the occupation of the shared cache by the media cache queue can be increased in time when a large number of media data are produced by media stream concurrency, so that the loss of media data, caused by the exhaustion of the cache occupied by other services, is avoided.
Description
Technical field
The present invention relates to the network communications technology, particularly a kind of method and apparatus of adjusting the media data buffer memory.
Background technology
The image of video coding is made up of frame, comprises figure (I frame), prognostic chart (P frame) and two-dimensional plot (B frame) in the frame.In the video coding system, image sequence is made up of picture group (GOP), and each GOP is initial with the I frame, wherein also may comprise P frame and B frame, and the length of GOP is the interval between the I frame.According to human eye vision, common image is per second 25 frames or 30 frames, and I frame per second produces one or more usually.Because the characteristics and the content of I frame, P frame and B frame are different, size also has nothing in common with each other, wherein, I frame maximum, the P frame takes second place, B frame minimum.
In the network equipment of transmitting video-frequency flow, all there is a formation in each port, and wherein one or more formations are used for the buffer memory video flowing, are called video queue, and other formation is used for other business.Because the whole buffer memory of the network equipment is limited, therefore, need the length of individual queue be limited, the buffer memory that is each port assignment setting is as formation, and remaining cache is as the shared buffer memory of the overall situation, and is full when certain professional formation, then takies shared buffer memory.In case the shared buffer memory of the network equipment exhausts, then the data that newly receive are carried out tail drop or random drop.
For Media Stream, do not have bigger shake in order to guarantee the display end image, every frame data of video flowing are at the uniform velocity sent or as possible linear speed send.Because the I frame is bigger, when the I frame produces, may produce burst phenomenon and exceed the average bandwidth of setting, when the concurrent transmission video flowing of a plurality of media stream source ends, burst phenomenon is more outstanding especially.In this case, the network equipment increases the buffer memory demand of media data, owing to can take shared buffer memory when the media buffer queue full, therefore, if shared buffer memory is taken by other business and makes buffer memory exhaust, then may cause media data to be dropped.
Summary of the invention
In view of this, the invention provides a kind of method and apparatus of adjusting the media data buffer memory, so that avoid the buffer memory restriction of the network equipment to cause media data to be dropped.
A kind of method of adjusting the media data buffer memory, this method is applied to comprise at least the network equipment of media buffer formation and shared buffer memory, wherein, the media buffer formation is used for the media data that the buffer memory network equipment receives, and shares when shared buffer memory is used for supplying media buffer formation or other service buffer formation to expire; It is characterized in that this method comprises:
A, the occupancy of media buffer formation is detected, if the occupancy that detects the media buffer formation more than or equal to presetting first threshold, execution in step B then; Be less than or equal to the second default threshold value, then execution in step C if detect the occupancy of media buffer formation;
B, size in the shared buffer memory is increased to the media buffer formation for the buffer memory of Δ C1, go to steps A;
C, the buffer memory of media buffer formation is reduced Δ C2, the buffer memory of minimizing goes to steps A as shared buffer memory;
Wherein, described first threshold is greater than described second threshold value, and Δ C1 and Δ C2 are default value.
A kind of device of adjusting the media data buffer memory, this device comprises: be used for the media buffer formation of the media data that buffer memory receives, and be used for the shared buffer memory shared when having expired for media buffer formation or other service queue; This device also comprises: the first formation detecting unit and formation control unit;
The described first formation detecting unit is used for the occupancy of media buffer formation is detected, if the occupancy that detects the media buffer formation more than or equal to presetting first threshold, then sends first to described formation control unit and adjusts notice; Be less than or equal to the second default threshold value if detect the occupancy of media buffer formation, then send second and adjust notice to described formation control unit;
Described formation control unit is used to receive first and adjusts when notifying, and size in the shared buffer memory is increased to the media buffer formation for the buffer memory of Δ C1; Receive second and adjust when notifying, with the buffer memory minimizing Δ C2 of media buffer formation, the buffer memory of minimizing is as shared buffer memory;
Wherein, described first threshold is greater than described second threshold value, and Δ C1 and Δ C2 are default value.
As can be seen from the above technical solutions, the present invention detects by the occupancy to the media buffer formation, dynamically adjust the take situation of media buffer formation according to detected situation to shared buffer memory, make at media data more, when for example Media Stream is concurrent, can in time increase the media buffer formation to the taking of shared buffer memory, avoid being taken and make buffer memory exhaust to cause media data to be lost by other business.
Description of drawings
Fig. 1 is a main method flow chart provided by the invention;
The detailed method flow chart that Fig. 2 provides for the embodiment of the invention;
The schematic diagram of Fig. 3 for adopting sliding window mode that media data is resolved;
The structure drawing of device that Fig. 4 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
The core concept of method provided by the present invention is mainly: the occupancy to media buffer formation in the network equipment detects, and adjusts the length of media buffer formation in real time according to the occupancy situation of media buffer formation.Key step can comprise as shown in Figure 1:
Step 101: the occupancy to the media buffer formation detects; If the occupancy that detects the media buffer formation is more than or equal to presetting first threshold Rmax, then execution in step 102; Be less than or equal to the second default threshold value Rmin if detect the occupancy of media buffer formation, then execution in step 103.
Step 102: size in the shared buffer memory is increased to the media buffer formation for the buffer memory of Δ C1, go to step 101.
Step 103: the buffer memory of media buffer formation is reduced Δ C2, and the buffer memory of minimizing goes to step 101 as shared buffer memory.
In the above-mentioned flow process, Rmax is greater than Rmin, and Δ C1 and Δ C2 are predefined value, and both can equate also can not wait.
Below in conjunction with specific embodiment said method provided by the invention is described in detail.The detailed method flow chart that Fig. 2 provides for the embodiment of the invention, in the present embodiment, the initial value that can suppose the media buffer formation is the same with the initial value of other service buffer formation all to be Cq; The length of this media buffer formation can be adjusted according to method provided by the invention, and the buffer memory that is about in the shared buffer memory is increased to the media buffer formation, and can set in advance the value to greatest extent that the media buffer formation is adjustable to is Cs.As shown in Figure 2, this method can specifically may further comprise the steps:
Step 201: the occupancy to the media buffer formation detects, if the occupancy that detects the media buffer formation more than or equal to presetting first threshold Rmax, then execution in step 202; Be less than or equal to the second default threshold value Rmin if detect the occupancy of media buffer formation, then execution in step 205.
In this step, can adopt the occupancy of modes such as real-time, periodicity to the media buffer formation detected.
Wherein, first threshold Rmax is greater than the second threshold value Rmin.
Step 202: judging whether the current media buffer queue reaches is worth Cs to greatest extent, if not, goes to step 203; If, execution in step 204.
In this step, if having reached, the length of current media buffer queue is worth Cs to greatest extent, show that then current media data emergency situations has reached very serious degree, needing to trigger the media stream source end adjusts the transmission of media data, notify it to postpone the transmission of media data, promptly execution in step 204.If reaching as yet, the length of current media buffer queue is not worth Cs to greatest extent, show that then current media data emergency situations is still in tolerance interval, then adopt to increase the mode of the shared buffer memory that the media buffer formation takies, the buffer memory of media data is adjusted.
Step 203: size in the shared buffer memory is increased to the media buffer formation for the buffer memory of Δ C1, go to step 201.
Suppose that Rmax is 80%, if the occupancy of media buffer formation reaches 80%, show that then the current media buffer queue can not satisfy the demand of media data, can increase the media buffer formation to the taking of shared buffer memory, be about to that size increases to the media buffer formation for the buffer memory of Δ C1 in the shared buffer memory.
Step 204: the media data in the media buffer formation is resolved, determine the media stream source end that causes media data concurrent, and send concurrent crash notification, go to step 201 to the media stream source end of determining.
When the media buffer formation reaches when being worth Cs to greatest extent, start media data and resolve, thereby determine the media stream source end that causes media data concurrent.
Determine to cause the concrete grammar of the concurrent media stream source end of media data to comprise: the media data in the media buffer formation is carried out the mirror image sampling; In the media data of determining to sample, the corresponding time period of quantity media stream source ends at most, the media stream source end of media data correspondence in this time period is defined as the media stream source end that causes media data concurrent.
Suppose that all Media Streams all adopt H.264 coded system, (RTP) transmits with real time transport protocol, per second comprises 25 frames, and all adopt identical GOP, at this moment, can adopt the sampling time of 80ms, i.e. the media data of mirror image sampling 80ms from the media buffer formation, and, the media data that samples is added timestamp.The media data that samples is resolved, determine the corresponding time period of quantity media stream source end at most, this process can adopt the mode of sliding window to realize: the sliding window in Preset Time length carries out in the process of stepping, add up the source IP address of the media data that the sliding window of each stepping position comprised, the time period of determining to comprise the maximum sliding window place of the source IP address quantity of media data is the time period of the maximum quantity media stream source of described correspondence end.
To slide window length is that 40ms is an example, as shown in Figure 3, each media data message all stabs if having time and distributes on time shaft by timestamp, and the sliding window of a 40ms of use carries out the source IP address of message to be added up, add up the source IP address of message in this cunning window, form a Zhang Yuan IP address table; Sliding window is that statistics is done in stepping 5 times with 10ms, obtain 5 Zhang Yuan IP address tables respectively, the source IP address quantity that compares 5 tables, select the maximum table of source IP address quantity as concurrent media stream source end IP address table, the media stream source end of each the source IP address correspondence in this table is to the concurrent source end that has the greatest impact of media data, promptly causes the concurrent media stream source end of media data.
Determine cause the concurrent media stream source end of media data after, the network equipment sends concurrent crash notification to this media stream source end, the media stream source end that receives concurrent crash notification is postponed the transmission of media data, for example a random time is adjusted in the transmission of media data backward, this random time is usually in the time span scope of sliding window.
Step 205: the buffer memory of media buffer formation is reduced Δ C2, and the buffer memory of minimizing goes to step 201 as shared buffer memory.
Suppose that Rmin is 60%,, show that then the media data situation that current network equipment receives is better, can be good at satisfying the demand of media data, then can reduce buffer queue taking shared buffer memory if the occupancy of media buffer formation reduces to 60%.
In the present embodiment, the length that can set the formation of minimum maintenance media buffer is initial value Cq, promptly after the length of media buffer formation reduces to Cq,, also no longer reduce the buffer memory that the media buffer formation takies even if the occupancy of media buffer formation is less than or equal to Rmin.Promptly can also comprise before step 205: whether the buffer memory of judging the current media buffer queue reduces length behind the Δ C2 less than default initial value Cq, if then directly go to step 201; Otherwise, continue to carry out described step 205.
More than be the detailed description that method provided by the present invention is carried out, below device provided by the present invention be described in detail.The structure drawing of device that Fig. 4 provides for the embodiment of the invention, this device can be arranged in the network equipment of transmitting media data, as shown in Figure 4, this device can comprise: media buffer formation 401, shared buffer memory 402, the first formation detecting unit 403 and formation control unit 404.
Wherein, media buffer formation 401 and shared buffer memory 402 are existing unit in the network equipment.Media buffer unit 401 is used for the media buffer formation of the media data that the buffer memory network equipment receives, and shares when shared buffer memory is used for having expired for media buffer formation or other service queue.
The first formation detecting unit 403 is used for the occupancy of media buffer formation 401 is detected, if the occupancy that detects media buffer formation 401 more than or equal to presetting first threshold Rmax, then sends first to formation control unit 404 and adjusts notice; Be less than or equal to the second default threshold value Rmin if detect the occupancy of media buffer formation 401, then send second and adjust notice to formation control unit 404.
Wherein, first threshold Rmax is greater than the second threshold value Rmin, and Δ C1 and Δ C2 are default value.
This first formation detecting unit 403 can real-time ground or periodically detect the occupancy of media buffer formation, notify taking of 404 pairs of shared buffer memory of formation control unit according to the situation that takies that detects and adjust.
Further, this device can also comprise: the second formation detecting unit 405 and medium resolution unit 406.
The second formation detecting unit 405, be used to receive the first adjustment notice that the first formation detecting unit 403 sends to formation control unit 404, and whether the buffer storage length that detects current media buffer queue 401 reaches the default Cs of value to greatest extent, if, send the parsing notice to medium resolution unit 406, and do not transmit first and adjust notice to formation control unit 404; Otherwise transmit first to formation control unit 404 and adjust notice.
The second formation detecting unit 405 determines that the buffer storage length of media buffer formation 401 reaches when being worth Cs to greatest extent, trigger the resolving of medium resolution unit 406, find out by parsing and to cause concurrent media stream source end, notify these media stream source end adjustment to send strategy.
Wherein, medium resolution unit 406 can specifically comprise: mirror image sampling subelement 4061, concurrent definite subelement 4062 and notice send subelement 4063.
Mirror image sampling subelement 4061 is used for the media data of media buffer formation 401 is carried out the mirror image sampling.
Concurrent definite subelement 4062, be used for corresponding time period of quantity media stream source ends at most of media data of determining that mirror image sampling subelement 4061 samples, the media stream source end of media data correspondence in this time period be defined as the media stream source end that causes media data concurrent.
Notice sends subelement 4063, is used for sending concurrent crash notification to the media stream source end that concurrent definite subelement 4062 is determined.
Particularly, concurrent definite subelement 4062 can add timestamp respectively with the media data that samples, the media data that samples according to the sequence arrangement of timestamp; Sliding window in Preset Time length carries out in the process of stepping, add up the source IP address of the media data that the sliding window of each stepping position comprised, determine to comprise the time period of the time period at the maximum sliding window place of the source IP address quantity of media data for corresponding maximum quantity media stream source ends.
More preferably, be initial value Cq if set the length of minimum maintenance media buffer formation, after the length of media buffer formation reduces to Cq,, also no longer reduce the buffer memory that the media buffer formation takies even if the occupancy of media buffer formation is less than or equal to Rmin.Promptly this device can further include: the 3rd formation detecting unit 407, be used to receive the second adjustment notice that the first formation detecting unit 403 sends to formation control unit 404, and whether the buffer memory of judging current media buffer queue 401 reduces length behind the Δ C2 less than default initial value Cq, if do not transmit second and adjust notice to formation control unit 404; Otherwise, transmit second to formation control unit 404 and adjust notice.
The above-mentioned first formation detecting unit 403, the second formation detecting unit 405 and the 3rd formation detecting unit 407 can be arranged in the same formation detecting unit to be realized.
By above description as can be seen, method and apparatus provided by the invention possesses following advantage:
1) the present invention detects by the occupancy to the media buffer formation, dynamically adjust the take situation of media buffer formation according to detected situation to shared buffer memory, make at media data more, when for example Media Stream is concurrent, can in time increase the media buffer formation to the taking of shared buffer memory, avoid being taken and make buffer memory exhaust to cause media data to be lost by other business.
2) when the length of media buffer formation reaches default value to greatest extent, illustrate that the concurrent situation of media data is serious, the present invention can be further by determining to cause the media stream source end of concurrent situation to the parsing of media data in the media buffer formation, notify these media stream source ends to postpone sending media data, to alleviate the concurrent phenomenon of media data, avoid the concurrent situation of media data seriously to have little time buffer memory and cause the phenomenon that is dropped.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. method of adjusting the media data buffer memory, it is characterized in that, this method is applied to comprise at least the network equipment of media buffer formation and shared buffer memory, wherein, the media buffer formation is used for the media data that the buffer memory network equipment receives, and shares when shared buffer memory is used for supplying media buffer formation or other service buffer formation to expire; It is characterized in that this method comprises:
A, the occupancy of media buffer formation is detected, if the occupancy that detects the media buffer formation more than or equal to presetting first threshold, execution in step B then; Be less than or equal to the second default threshold value, then execution in step C if detect the occupancy of media buffer formation;
B, size in the shared buffer memory is increased to the media buffer formation for the buffer memory of Δ C1, go to steps A;
C, the buffer memory of media buffer formation is reduced Δ C2, the buffer memory of minimizing goes to steps A as shared buffer memory;
Wherein, described first threshold is greater than described second threshold value, and Δ C1 and Δ C2 are default value.
2. method according to claim 1 is characterized in that, also comprises before described step B: whether the buffer storage length of judging the current media buffer queue reaches default value to greatest extent, if, execution in step D; Otherwise, continue to carry out described step B;
D, the media data in the media buffer formation is resolved, determine the media stream source end that causes media data concurrent, and the media stream source end that notice is determined postpones sending media data, go to steps A.
3. method according to claim 2 is characterized in that, among the step D media data in the media buffer formation is resolved, and determines to cause the concurrent media stream source end of media data specifically to comprise:
D1, the media data in the media buffer formation is carried out mirror image sampling;
The corresponding time period of quantity media stream source ends at most in D2, the media data determining to sample, the media stream source end of media data correspondence in this time period is defined as the media stream source end that causes media data concurrent.
4. method according to claim 3 is characterized in that, the corresponding time period of quantity media stream source end at most specifically comprises in the media data of determining described in the step D2 to sample:
The described media data that samples is added timestamp respectively, the media data that samples according to the sequence arrangement of timestamp;
Sliding window in Preset Time length carries out in the process of stepping, add up the source IP address of the media data that the sliding window of each stepping position comprised, the time period of determining to comprise the maximum sliding window place of the source IP address quantity of media data is the time period of the maximum quantity media stream source of described correspondence end.
5. method according to claim 1 is characterized in that, is also comprising before the described step C: whether the buffer memory of judging the current media buffer queue reduces length behind the Δ C2 less than default initial value, if then directly go to steps A; Otherwise, continue to carry out described step C.
6. device of adjusting the media data buffer memory, this device comprises: be used for the media buffer formation of the media data that buffer memory receives, and be used for the shared buffer memory shared when having expired for media buffer formation or other service queue; It is characterized in that this device also comprises: the first formation detecting unit and formation control unit;
The described first formation detecting unit is used for the occupancy of media buffer formation is detected, if the occupancy that detects the media buffer formation more than or equal to presetting first threshold, then sends first to described formation control unit and adjusts notice; Be less than or equal to the second default threshold value if detect the occupancy of media buffer formation, then send second and adjust notice to described formation control unit;
Described formation control unit is used to receive first and adjusts when notifying, and size in the shared buffer memory is increased to the media buffer formation for the buffer memory of Δ C1; Receive second and adjust when notifying, with the buffer memory minimizing Δ C2 of media buffer formation, the buffer memory of minimizing is as shared buffer memory;
Wherein, described first threshold is greater than described second threshold value, and Δ C1 and Δ C2 are default value.
7. device according to claim 6 is characterized in that, this device also comprises: the second formation detecting unit and medium resolution unit;
The described second formation detecting unit, be used to receive the first adjustment notice that the described first formation detecting unit sends to described formation control unit, and whether the buffer storage length that detects the current media buffer queue reaches default value to greatest extent, if, send the parsing notice to described medium resolution unit, and do not transmit described first and adjust notice to the formation control unit; Otherwise, transmit described first to the formation control unit and adjust notice;
Described medium resolution unit, be used to receive when resolving notice, media data in the media buffer formation is resolved, determine the media stream source end that causes media data concurrent, and send concurrent crash notification to the media stream source end of determining, postpone sending media data to notify described definite media stream source end.
8. device according to claim 7 is characterized in that, described medium resolution unit specifically comprises: mirror image sampling subelement, concurrent definite subelement and notice send subelement;
Described mirror image sampling subelement is used for the media data of media buffer formation is carried out the mirror image sampling;
Described concurrent definite subelement, be used for corresponding time period of quantity media stream source ends at most of media data of determining that described mirror image sampling subelement samples, the media stream source end of media data correspondence in this time period be defined as the media stream source end that causes media data concurrent;
Described notice sends subelement, is used for sending concurrent crash notification to the media stream source end that described concurrent definite subelement is determined.
9. device according to claim 8 is characterized in that, described concurrent definite subelement adds timestamp respectively with the described media data that samples, the media data that samples according to the sequence arrangement of timestamp; Sliding window in Preset Time length carries out in the process of stepping, add up the source IP address of the media data that the sliding window of each stepping position comprised, the time period of determining to comprise the maximum sliding window place of the source IP address quantity of media data is the time period of the maximum quantity media stream source of described correspondence end.
10. device according to claim 6, it is characterized in that, this device also comprises: the 3rd formation detecting unit, be used to receive the second adjustment notice that the described first formation detecting unit sends to described formation control unit, and whether the buffer memory of judging the current media buffer queue reduces length behind the Δ C2 less than default initial value, if do not transmit described second and adjust notice to the formation control unit; Otherwise, transmit described second to the formation control unit and adjust notice.
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