CN1614953A - Data controlling method for medium player system - Google Patents
Data controlling method for medium player system Download PDFInfo
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- CN1614953A CN1614953A CNA2003101181646A CN200310118164A CN1614953A CN 1614953 A CN1614953 A CN 1614953A CN A2003101181646 A CNA2003101181646 A CN A2003101181646A CN 200310118164 A CN200310118164 A CN 200310118164A CN 1614953 A CN1614953 A CN 1614953A
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Abstract
The system consists of a data terminal and a displaying terminal. The displaying terminal is connected with the data terminal through a network. The data terminal includes an encoder used in encoding media data. The displaying terminal includes a buffer used in storing package of media data. The method compares the package numbers of media data stored in the buffer with an upper limit value and a lower limit value. If the package numbers is more than the upper limit value the encoding speed for the media data will be reduced. If the package numbers is less than the lower limit value the encoding speed for the media will be increased.
Description
Technical field
The present invention relates to a kind of media play system, particularly a kind of critical value of utilizing flow control and dynamically adjusting buffering area Storage Media data packet size is with the method for operating of control media play system.
Background technology
Human information propagation pattern is by Still Media (literal, figure) is evolved to dynamic media (music, film), and along with the fast development of network transmission technology, between short many decades, can become indispensable information and amusement source of human every day gradually by the Online Music and the online film of netcast.
Yet the broadcast of Online Music and online film can be subject to the influence of the network bandwidth and transmission quality.Because internet (Internet) has interconnected but the mutual characteristic of pipe not, the actual spendable bandwidth of user may be fixed never, that is to say that the bandwidth that ISP provided is theoretic maximum usually.For instance, the online speed of user congested time of ADSL/Cable broadband systems such as (360Kbps/sec) may have only below the 100K, and the user that more need not carry the 56Kbps modulator-demodulator may have only 28Kbps/sec or still less.Even under not congested situation, online speed still has+/-difference that 10%-30% does not wait, in addition in the communication of wireless network, because frequency spectrum resource is limited, system uses the mode share web bandwidth of the division of labor (Multiple Access) more, so the variation of the network bandwidth is difficult to prediction especially.
In addition, unsettled online speed also is the factor of the online audio-visual broadcast of influence.If when intermittent, the user must be very worried because of unsettled online speed in the broadcast of Online Music.Once all downloading the mode of playing again after finishing if adopt, is a film of two hours in case run into text, and time of Xia Zaiing and required Storage Media will be considerable so.
In order to address the above problem, present online Media Play System develops a kind of mode deal with data of series flow channel.See also Fig. 1, Fig. 1 is the functional block diagram of known online Media Play System 10.Media play system (media player system) 10 comprises a data terminal 12 and and plays end 14.Data terminal 12 comprises an encoder 22, and it is used to send the media data package that gives broadcast end 14 to be encoded tendency to develop, plays end 14 and then can be linked to data terminal 12 by a network 20.Play end 14 and comprise a buffering area (buffer) 16, be used for the package of Storage Media data, and a decoder 18, be used for being exported after the media data packages decoding in will buffering area 16.Play end 14 before the media data of played data end 12, play end 14 and can download one section media data in advance and deposit buffering area 16 in, will take media data package in the buffering area 16 with usefulness as broadcast and play end 14.After data terminal 12 is all sent required package, will send a termination signal, and after playing end 14 and reading the termination signal that data terminal 12 transmitted, will finish the played data package.But, if the interruption of no early warning takes place in data terminal 12, after broadcast end 14 treats that buffering area 16 stored media datas finish so, do not read termination signal owing to play end 14, play package that end 14 can't decision data end 12 whether all transmission finish, so play the packages of end 14 meeting repeat playing buffering areas 16 last outputs, buffering area 16 interior packages deciphered and exported broadcast mostly this moment, so only surplus a spot of package can be repeated to play, play end 14 same and a spot of package presents the state of walk back and forth Buddhist broadcast noise or ghost because of continuous output and make.
In view of this, present settling mode is to utilize to play to hold 14 regularly to send a detection signal (probepacket), if this detection signal transmits failure or stops to transmit, can confirm that data terminal 12 has stopped transmitting package, play end 14 this moment and just stop to play and emptying the buffering area 16 of playing end 14.If but the frequency setting that will send detection signal is too high, can lower the effective bandwidth that influences network 20 transmission; If it is too low to send the frequency of detection signal, then possibly can't real time reaction data terminal 12 stop state that playing, and stopped transmitting and in the package of buffering area 16 finishes, play the data packets that end 14 still continues the 16 last outputs of repeat playing buffering areas at data terminal 12.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of method that is used for the Data Control of a media play system, the mode of utilizing flow control and dynamically adjusting the critical value of buffering area buffering area Storage Media data packet size is to address the above problem.
Claim of the present invention provides a kind of method that is used for the Data Control of a media play system, media play system comprises a data terminal and and plays end, playing end is in data terminal by a network connections, data terminal comprises an encoder, be used for to media data encoding, play end and comprise a buffering area, be used for the package of Storage Media data, this method comprises the package amount of buffering area Storage Media data and a higher limit and a lower limit is compared; If the package amount of buffering area Storage Media data is then slowed down the coding rate of the encoder of data terminal to media data greater than higher limit; And if the package amount of buffering area Storage Media data less than lower limit, the encoder of then accelerating data terminal is to the coding rate of media data or the transfer rate in network.
The present invention discloses in addition according to the size of network traffics and adjusts the upper limit and the lower limit of distributing to the package amount of temporary package in the buffering area storage, when the active volume size that detects network increases, the expression network can transmit more package, therefore the package amount of temporary package of the upper limit and lower limit distribute to to(for) buffering area all can improve, and the data volume that can transmit when network is limited, then can reduce the higher limit and the lower limit of buffering area, storage volume that can more effective application buffering area.
The method of claim of the present invention is more according to the variation size of this network active volume, judge whether network is stable, when variable quantity greater than one first reference value, the expression change of network environment is quick, then increase this higher limit and reduce this lower limit, to increase the distance of the upper limit and lower limit, make and play the package that end does not need to adjust transmission always, work as variable quantity in addition less than one second reference value, the expression network environment is stable, then reduce this higher limit and increase this lower limit, can disengage partial memory can use for other, more increases the service efficiency of internal memory.
The accompanying drawing summary
Fig. 1 is the functional block diagram of known online Media Play System.
Fig. 2 is the functional block diagram of media play system of the present invention.
Fig. 3 is the flow chart of the Data Dynamic flow control of media play system of the present invention.
Fig. 4 is the variation diagram of buffering area in the stored media data package amount of each time point.
Fig. 5 is the method flow diagram of first embodiment of dynamic adjustment higher limit H of the present invention (t) and lower limit L (t).
The reference numeral explanation
10,30: media play system; 12,32: data terminal;
14,34: play end; 16,36: buffering area
18,38: decoder 20: network
22,42: encoder 44: logical block
Execution mode
See also Fig. 2, Fig. 2 is the functional block diagram of media play system of the present invention (media player system) 30.Media play system 30 comprises a data terminal 32 and and plays end 34, and the network 20 that passes through between data terminal 32 and the broadcast end 34 interconnects.Data terminal 32 comprises an encoder (encoder) 42, it is used for sending the media data package that gives broadcast end 34 to be encoded tendency to develop, play end 34 and comprise a buffering area (buffer) 36 and decoder (decoder) 38, buffering area 36 is the media data packages that are used for storing input, and decoder 38 is to be used for the media data package is deciphered.Play end 34 before the media data of played data end 32, play end 34 and can download one section media data in advance and deposit buffering area 36 in, will take media data package in the buffering area 36 with usefulness as broadcast and play end 34.
See also Fig. 3, Fig. 3 is the flow chart of the Data Dynamic flow control of media play system 30 of the present invention.Its step is as follows:
Step 100: beginning;
Step 102: data terminal 32 media data packages are to playing end 34;
Step 104: the buffering area 36 of playing end 34 stores the media data package that is transmitted by data terminal 32;
Step 106: the package amount of buffering area 36 Storage Media data and a higher limit and a lower limit are compared; If the package amount of buffering area 36 Storage Media data is then sent one first control signal and is given data terminal 32 greater than higher limit, and execution in step 108; If the package amount of buffering area 36 Storage Media data is then sent one second control signal and is given data terminal 32 less than this lower limit, and execution in step 110;
Step 108: after data terminal 32 received this first control signal, the encoder 42 of meeting control data end 32 slowed down the coding rate to media data; And
Step 110: after data terminal 32 receives this second control signal, the coding rate that the encoder 42 of meeting control data end 32 is accelerated media data;
Step 112: finish.
The operation of media play system 30 is described as follows.Be connected to data terminal 32 when playing end 34 desires by network 20, and during the stored medium text data (such as MP3 music file, MPEG image file or any multimedia text formatting) of played data end 32, data terminal 32 can for example utilize wireless network 802.11b communication transport protocols to come the media data package to playing end 34 via the communication mode of network 20 by a kind of data network.Play end 34 and after receiving media data, can earlier the media data package be stored in buffering area 36, more in regular turn by decoder 38 output of being decoded.Because the instability of network transfer speeds, especially the environment of wireless network, make buffering area 36 interior stored media data packages different storage capacitys all be arranged constantly at each, therefore, play end 34 and comprise a logical block 44 in addition, it can periodically detect the stored media data package amount of buffering area 36.If a certain period, the media data package amount that the buffering area 36 of playing end 34 is given in network 20 transmission is higher than when playing end 34 via decoder 38 and the speed play, overflow the situation of (overflow) for fear of buffering area 36, this moment, logical block 44 meetings compare with a higher limit H (t), once the media data package amount that logical block 44 detects buffering area 36 is during greater than higher limit H (t), will send one first alarm signal and give data terminal 32, and after the encoder 42 of data terminal 32 receives this first alarm signal, will slow down the coding rate of 42 pairs of media datas of encoder, and 20 coded media data packages that can transmit of network will reduce naturally, impel the buffering area 36 interior Storage Media data packet amounts of playing end 34 to be descended.Otherwise, if a certain period, the media data package amount that the buffering area 36 of playing end 34 is given in network 20 transmission is lower than when playing end 34 via decoder 38 and the speed play, it is not enough and cause the situation of the package of having play that must repeat playing for fear of buffering area 36 the media data packages can to take place, this moment, logical block 44 meetings compare with a lower limit L (t), in case the media data package amount that logical block 44 detects buffering area 36 is during greater than lower limit L (t), will send one second alarm signal and give data terminal 32, and after the encoder 42 of data terminal 32 receives this second alarm signal, will accelerate the coding rate of 42 pairs of media datas of encoder, impel network 20 to increase the transmission quantity of coded media data package, make the buffering area 36 interior Storage Media data packet amounts of playing end 34 be increased.If communication environment worsens or network is busy, when causing the package that successfully transmits to reduce, the package amount of buffering area 36 Storage Media data is less than lower limit L (t), then logical block 44 can enter in the buffering area 36 by the quiet package of insertion, and broadcast end 34 can stop to read the package of the media data that is stored in buffering area 36 earlier, and read and play above-mentioned quiet package, produce one quiet, by the time the package amount of receiving media data again greater than lower limit L (t) afterwards, logical block stops to insert quiet package in buffering area 36, plays end 34 and just can continue the stored media data package of play buffer 36.Thus, media play system 30 just can use above-mentioned control method, and Storage Media data packet amount spill-overs or media data package quantity not sufficient take place the buffering area 36 of avoiding playing end 34 and the situation that causes playing noise takes place.
See also Fig. 4, Fig. 4 is the variation diagram of buffering area 36 in the stored media data package amount of each time point.Aforementioned mentioning, higher limit H (t) and lower limit L (t) are the key points of the data terminal 32 transmission of media data packages of control media play system 30, so how suitably capping value H (t) will be for the running important influence of media play system 30 with lower limit L (t).See also Fig. 5, Fig. 5 for the present invention according to the size of network traffics N (t) moment of transfer of data with and change size, dynamically adjust the method flow diagram of higher limit H (t) and first embodiment of lower limit L (t).Its step is summarized as follows:
Step 150: detect network traffics N (t);
Step 152: judge that whether network traffics N (t) is greater than a predetermined value; If, execution in step 154, if not, execution in step 156;
Step 154: if network traffics N (t), then increases higher limit H (t) and lower limit L (t) simultaneously greater than this predetermined value;
Step 156: if network traffics N (t), then reduces higher limit H (t) and lower limit L (t) simultaneously less than this predetermined value;
The variance Var (N (t)) of step 158: computing network flow N (t) in a scheduled time slot, greater than one first reference value, if execution in step 160 is less than one second reference value, execution in step 162 as if variance Var (N (t));
Step 160: increase higher limit H (t) and reduce lower limit L (t); And
Step 162: reduce higher limit H (t) and increase lower limit L (t).
In order to allow the higher limit H (t) and the operable flow of lower limit L (t) energy view network 20 adjust dynamically, so logical block 44 can regularly detect the utilizable flow N (t) of network 20 in addition.When the flow of network 20 during greater than a predetermined value, expression data terminal 32 can transmit more package to network 20, will increase higher limit H (t) and lower limit L (t) so play end 34.Opposite, as the utilizable flow N of network 20 (t) during less than this predetermined value, expression data terminal 32 has transmitted too much package to network 20, will reduce higher limit H (t) and lower limit L (t) so play end 34.Except foundation network utilizable flow N (t) comes upper control limit value H (t) and lower limit L (t),, cause higher limit H (t) and the frequent adjustment of lower limit L (t) easily if the variation of network traffics N (t) is too unstable.So, logical block 44 also can be understood the variance Var (N (t)) of timing detection network traffics N (t) in a scheduled time slot in addition, if variance Var (N (t)) is greater than one first reference value, mean that higher limit H (t) and lower limit L's (t) is too approaching apart from size, cause higher limit H (t) and lower limit L (t) change frequency too frequent, should increase higher limit H (t) this moment, and reduction lower limit L (t), thus, distance between higher limit H (t) and the lower limit L (t) widens, and just can avoid higher limit H (t) and lower limit L (t) constantly to change.Otherwise when logical block 44 detects variance Var (N (t)) less than the straight judgment value of one second reference, mean that higher limit H (t) is too big with the distance of lower limit L (t), should reduce higher limit H (t) this moment, and increase lower limit L (t), thus, the distance between higher limit H (t) and the lower limit L (t) will reduce, and makes higher limit H (t) and lower limit L (t) can have the adjustment of appropriateness to change, so going out partial memory can be for other use, can more effective use internal memory.
Media play system 30 matching step 100 of the present invention to the flow process of step 112 promptly can be by after detecting a stored media data package amount of the buffering area 36 of playing end 34 and a higher limit and a lower limit and comparing, being used for control data end 32, overflow the not enough and situation of the package must repeat playing play before of (overflow) or media data package to avoid buffering area 36 for the coding rate of media data package.And matching step 150 is to step 162, more can make the running of media play system 30 can adjust the transmission speed of the coding rate and the adjustment network 20 of 22 pairs of media datas of encoder so that the media data package amount of required storage can be adjusted this higher limit and this lower limit in a dynamic way in the buffering area 36 according to the situation of buffering area 36 Storage Media data packets.
Compare known technology, the speed that media play system of the present invention can utilize the package amount of the buffering area that detects the broadcast end to come control data end media data package, thus, when the package amount of buffering area during greater than higher limit, impel data terminal to slow down coding rate, or reduce the transfer rate of network for the media data package to the media data package that transmits; When the package amount of buffering area during, impel data terminal to accelerate coding rate, or increase the transfer rate of network for the media data package to the media data package that transmits less than lower limit.In addition, also can utilize the detection network transfer speeds whether to be greater than or less than a predetermined value, dynamically adjust higher limit and lower limit.Moreover, when the variance of network transfer speeds greater than a judgment value, when perhaps the change frequency of higher limit and lower limit was too frequent, method of the present invention also can dynamically be adjusted the distance of higher limit and lower limit suitably to adjust the package amount that data packet can be stored in buffering area.By method of the present invention, media play system can utilize just can be so that media play system can operate smoothly between less buffer empty.
Claims (16)
1. method that is used for the Data Control of a media play system, this media play system comprises a data terminal and and plays end, this broadcast end is in this data terminal by a network connections, this data terminal comprises an encoder, be used for to media data encoding, this broadcast end comprises a buffering area, is used for the package of Storage Media data, and this method comprises:
One package quantity of these buffering area Storage Media data and a higher limit and a lower limit are compared;
If the package amount of these buffering area Storage Media data is then slowed down the coding rate of the encoder of this data terminal to media data greater than this higher limit; And
If the package amount of these buffering area Storage Media data is then accelerated the coding rate of the encoder of this data terminal to media data less than this lower limit.
2. the method for claim 1, it comprises in addition and detects media data and be sent to the speed that this broadcasts is held by this data terminal; If media data is sent to speed that this broadcasts holds greater than a predetermined value by this data terminal, then increase the higher limit and the lower limit of this buffering area; And, then reduce the higher limit and the lower limit of this buffering area if media data is sent to speed that this broadcasts holds less than this predetermined value by this data terminal.
3. the method for claim 1, it comprises in addition and detects media data is sent to the speed that this broadcasts holds by this data terminal variance (variance); If this variance greater than one first reference value, then increases this higher limit and reduces this lower limit; And if this variance less than one second reference value, then reduces this higher limit and increases this lower limit.
4. the method for claim 1, wherein this data terminal media data of reaching this broadcast end is an image format.
5. the method for claim 1, this image format is a mpeg format.
6. the method for claim 1, wherein this data terminal media data of reaching this broadcast end meets a phonetic matrix.
7. the method for claim 1, this phonetic matrix is a MP3 format.
8. method as claimed in claim 6, it comprises in addition if the package amount of these buffering area Storage Media data less than this lower limit, then should broadcast be held stops to export the package of the media data that is stored in this buffering area, and plays one quiet.
9. the method for claim 1, wherein the Network Transmission between this data terminal and this broadcast end is to be a wireless communication transmissions.
10. method that is used for the Data Control of a media play system, this media play system comprises a data terminal and and plays end, this broadcast end is in this data terminal by a network connections, this data terminal comprises an encoder, be used for to media data encoding and transmit a plurality of data packets to this broadcast end, this broadcast end comprises a buffering area, a decoder and a logical block, this buffering area is used for storing these a plurality of packages, this decoder reads the package in this buffering area and plays, and this method comprises:
The package amount of these buffering area Storage Media data and a higher limit and a lower limit are compared;
If the package amount of these buffering area Storage Media data is less than this lower limit, this logical block produces a predetermined package and is stored in this buffering area; And
This decoder reads this predetermined package and plays;
If the package amount of these buffering area Storage Media data is greater than this lower limit, this control unit stops to produce should predetermined package.
11. method as claimed in claim 10 more comprises:
If the package amount of these buffering area Storage Media data is greater than this higher limit, then this logical block is notified this encoder, slows down the coding rate of the encoder of this data terminal to media data; And
If the package amount of these buffering area Storage Media data is less than this lower limit, then this logical block is notified this encoder, accelerates the coding rate of the encoder of this data terminal to media data.
12. method as claimed in claim 10, wherein, the media data that this data terminal reaches this broadcast end is an image format, and this predetermined package content is a still frame.
13. the method for claim 1, wherein to reach the media data of this broadcast end be to meet a phonetic matrix to this data terminal, this predetermined package content is one quiet.
14. method that is used for the Data Control of a media play system, this media play system comprises a data terminal and and plays end, this broadcast end is in this data terminal by a network connections, this data terminal comprises an encoder, be used for to media data encoding, this broadcast end comprises a buffering area, is used for the package of Storage Media data, and this method comprises:
Set a higher limit and a lower limit in the buffering area, utilize this upper lower limit value and this buffering area Storage Media data relatively to adjust this encoder encodes speed;
Detect media data and whether be sent to the speed of this broadcast end greater than a predetermined value by this data terminal;
If media data is sent to speed that this broadcasts holds greater than this predetermined value by this data terminal, then increase this higher limit and this lower limit; And
If media data is sent to speed that this broadcasts holds less than this predetermined value by this data terminal, then reduce this higher limit and this lower limit.
15. method as claimed in claim 14, it comprises in addition if the package amount of these buffering area Storage Media data greater than this higher limit, is then slowed down the coding rate of the encoder of this data terminal to media data; And if the package amount of these buffering area Storage Media data less than this lower limit, is then accelerated the coding rate of the encoder of this data terminal to media data.
16. method as claimed in claim 14, it comprises the detection media data is sent to the speed of this broadcast end by this data terminal variance in addition; If this variance greater than one first reference value, then increases this higher limit and reduces this lower limit; And if this variance less than one second reference value, then reduces this higher limit and increases this lower limit.
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| CNB2003101181646A CN100379224C (en) | 2003-11-06 | 2003-11-06 | Data controlling method for medium player system |
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| CNB2003101181646A CN100379224C (en) | 2003-11-06 | 2003-11-06 | Data controlling method for medium player system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8499090B2 (en) | 2008-12-30 | 2013-07-30 | Intel Corporation | Hybrid method for delivering streaming media within the home |
| CN105847942A (en) * | 2016-04-01 | 2016-08-10 | 青岛海信宽带多媒体技术有限公司 | Media data buffering method, media data buffering device and intelligent television |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5848239A (en) * | 1996-09-30 | 1998-12-08 | Victory Company Of Japan, Ltd. | Variable-speed communication and reproduction system |
| CN1110152C (en) * | 1996-10-30 | 2003-05-28 | 日本胜利株式会社 | Variable-speed communication and reproduction system |
| CN1127857C (en) * | 1999-01-06 | 2003-11-12 | 皇家菲利浦电子有限公司 | Transmission system for transmitting multimedia signal |
| US6377931B1 (en) * | 1999-09-28 | 2002-04-23 | Mindspeed Technologies | Speech manipulation for continuous speech playback over a packet network |
| US7453897B2 (en) * | 2001-10-03 | 2008-11-18 | Global Ip Solutions, Inc. | Network media playout |
| CN1205566C (en) * | 2002-02-05 | 2005-06-08 | 清华大学 | Network bandwidth adaptive multimedia transmission system |
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2003
- 2003-11-06 CN CNB2003101181646A patent/CN100379224C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8499090B2 (en) | 2008-12-30 | 2013-07-30 | Intel Corporation | Hybrid method for delivering streaming media within the home |
| CN101778026B (en) * | 2008-12-30 | 2014-01-29 | 英特尔公司 | A hybrid method for delivering ''streaming'' media within the home |
| CN105847942A (en) * | 2016-04-01 | 2016-08-10 | 青岛海信宽带多媒体技术有限公司 | Media data buffering method, media data buffering device and intelligent television |
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