CN100593333C - Method and system for sending video information - Google Patents
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Abstract
The invention is used in switchover agent of wired or wireless channel. It comprises the following steps: receiving the request from a special user; according to the request, requesting a special video stream; the memory module saves the one packet of the special video stream and several previous video packets into the FIFO memory. Said channel switch agent system comprises: a first receiving module, a second receiving module, a memory module, a FIFO memory and a channel transmitting module.
Description
Technical field
The present invention relates to a kind of method and system that send video information, especially relate to a kind of Zapping agent system that the mobile TV system sends video information that is used for.
Background technology
In recent years, rise gradually based on the multimedia service (as mobile phone TV services, mobile phone advertisement business) that wireless network is realized, the network condition of its commercial operation and related media technology are also in continuous maturation.For example transmit mode and the mode of broadcast group broadcast or the mode that both combine that TV programme can adopt mobile flow medium by the mobile network.The wireless communication system and the method that are used to carry the sub-district multicast service have multimedia broadcast-multicast service (MBMS, Multimedia Broadcast/Multicast Service), broadcasting multicast service (BCMCS, Broadcast/Multicast Service) etc., thus realize the broadcasting and the multicast of high-speed multimedia business.
In the broadcast group broadcast mode is example, the programme televised live of mobile TV system typically uses multicast (multicast) technology, multicast data flow is generally passed through transmission network with the form of IP bag, live content is sent to router, GGSN (GGSN), GPRS serving GPRS support node (SGSN), radio network controller (RNC) and the Node B (NodeB) etc. of network from program source, to the last the mobile phone by user side receives, and will play back after the Frame decoding.
The network equipments such as GGSN are responsible for responding Internet igmpinternet (IGMP) request from mobile phone, and continue to add or withdraw from the program multicast tree to its upstream multicast node application according to this request type.When user's operating handset is watched program, mobile phone will be initiated IGMP to its upstream IGMP node (as GGSN) and be added multicast group message, if upstream IGMP node is just in the data that receive this multicast group, it can transmit the program data of this channel to mobile phone at once so; Otherwise this node also needs further to add the target multicast group to its upstream multicast node application.
Transmit under the network condition at current mobile TV, the program source after gathering and editing can be compressed to usually MPEG-2, MPEG-4, H.264, the data of forms such as VC-1, AVS transmit.These media coding forms have often adopted the associated frame compress technique.With MPEG-2 is example, and it has three kinds of basic frame of video: adopt the I frame of intraframe coding, adopt the P frame of predictive coding and the B frame of employing bi-directional predictive coding.But wherein have only the I frame to be decoded individually and to show, P frame, B frame then need with reference to certain I frame and (or) the P frame could realize being correctly decoded.Usually, I frame and P frame, B frame transmit according to the order of IPBBPBB, and 13 or 15 such frame sequences are called an image sets (GoP).In a complete GoP, the I frame is first frame often.The I frame has comprised the initial information that is used for picture decoding, and mobile phone is according to the I frame, other frame in the GoP that just may decode.When mobile phone receives an incomplete GoP who lacks the I frame,, that is to say that the decoder of mobile phone need wait for that the arrival of next I frame just may begin decoding owing to B, P frame can't will be continued to wait for by independent decoding.For mobile phone, under the situation of missing the I frame, the follow-up P frame that receives, B frame are also all invalid.Suppose that the MPEG-2 frame sequence that multicast network transmits is I0, P3, B1, B2, P6, B4, B5..., mobile phone then is I0, B1, B2, P3, B4, B5, P6... to the DISPLAY ORDER of program stream.If first frame that mobile phone receives is the I0 frame, can be used for decoding so; But if the frame that receives all is B, P frame, so until before the arrival of next I frame, the frame of being received all must abandon.Thereby the I frame period can have influence on the speed that presents of video.In the MPEG-2 form, the frequency of occurrences of I frame approximately was 2 frame/seconds.Under the poorest situation, mobile phone need wait for that the time (about 500ms) of 1 GoP just can receive the I frame.This brings bad experience to the user easily.When changing platform, if first data that forward have comprised the I frame just, the experience of changing platform so specifically is perhaps good.On the contrary, if I frame not in the data that initially receive, on then the user must wait more for a moment.This phenomenon has reflected that the I frame period has restricted the platform speed of changing of mobile TV to a certain extent.In order to eliminate or to reduce this influence, can consider to shorten the I frame period, use the shorter GoP of length in other words.But shorter I frame period means that data quantity transmitted will increase, and this can propose higher requirement to user's access bandwidth.
As seen, the characteristics of medium encoding and decoding present speed to the mobile TV video certain influence, if mobile TV to change the platform time delay longer, the rating that just has influence on the user is easily experienced.
Fig. 1 a has described mobile TV system 1, and it comprises video server 11, intermediary network device 12 and at the client device (CPE) 13 of specific user position.
Client device (CPE) 13 for example is a mobile phone terminal.
CPE13 comprises decoder module DEC, and it is used for decoding and any one of display of video streams VS1 to VSN.
CPE13 comprises that channel switches client ZapCI, and it is connected with Zapping agent ZapAg.Channel switches client ZapCI and sends channel switching signal zap_chn to Zapping agent ZapAg, asks specific video stream VSn (1≤n≤N) thus.So Zapping agent ZapAg transmits corresponding video flowing VSn to CPE13.
Fig. 1 b has described mobile TV system 2, and wherein video flowing VS1 to VSN is available at video server 11 places only.In this configuration, video server 11 comprises Zapping agent, is used for controlling to the user by intermediary network device possibly transmitting video flowing.
As an example, typically GoP is the sequence of frames of video of IBBPBBPBBP form.
Should be pointed out that the common employing order different with DISPLAY ORDER sends frame of video, so that make that decoding is reaching faster of cause and effect.
With reference to previous example, GoP will be sent out as IPBBPBBPBB.
Should also be noted that frame also can be relevant with the frame of another GoP (open GoP is to the GoP of sealing).
With reference to previous example, video sequence IBBPBBPBBP has formed the GoP of sealing.
Fig. 2 has described two video flowing VSm (1≤m≤N, m ≠ n) represent with the time shaft of VSn.
When the user begins when channel chm changes to channel chn and promptly changes platform, network node stops to send the frame of previous channel, and begins to send the frame (seeing the t_zap among Fig. 2) of new channel.
When sending the channel switching signal, CPE typically refreshes its decoding buffer, and waits for new frame.First frame that decoder receives may not be the I frame, can not decode thus up to receiving new I frame.So before showing new channel, decoder will still will be waited for the frame (seeing the t_streaming among Fig. 2) that receives sufficient amount.Therefore, the time between t_zap and t_streaming can be higher than the time of a GoP far away, the experience that this brings the channel of slow response to switch to the user.
Summary of the invention
The objective of the invention is to change platform speed to improve user watched experience by accelerating mobile TV.
According to a kind of method that the mobile TV system sends video information that is used for of the present invention, comprise the following steps:
-receive request from special handset television system user, ask specific video stream thus;
-reception is from the described specific video stream of video source;
-with the historical video data packets of continuous a plurality of somes of the nearest video data packets of the current described specific video stream that is forwarded and front institute adjacency thereof, be stored in the first in first out structure memory 113;
-send described specific video stream according to one of following dual mode to described specific user:
Mode one: send described specific video stream from described first in first out structure memory 113 to described specific user earlier, send described specific video stream from described video source to described specific user again.Promptly send described specific video stream to described specific user from described first in first out structure memory 113, and, when a video data packets that receives described specific video stream from described video source, and in the time of it can being used for further transmitting, if the video data packets of 113 li any one stored described specific video streams of described first in first out structure memory this moment, all sent to described specific user, stop so sending video flowing to described specific user from described first in first out structure memory 113, and transmit a described video data packets and follow-up video data packets to described specific user from described video source; Otherwise, continue to send described specific video stream to described specific user, and a described video data packets be stored in the described first in first out structure memory 113 from described first in first out structure memory 113.
Mode two: send described specific video stream from described first in first out structure memory 113 and described video source to described specific user simultaneously.Promptly 113 transmit described specific video stream to described specific user from described video source; Meanwhile, send described specific video stream from described first in first out structure memory 113 to described specific user, if the video data packets of 113 li any one stored described specific video streams of described first in first out structure memory, all sent to described specific user, stop so sending described specific video stream to described specific user from described first in first out structure memory 113, otherwise, continue to send described specific video stream from described first in first out structure memory 113 to described specific user simultaneously.
The present invention relates to a kind of Zapping agent system 101 that uses the mobile TV system of said method simultaneously, comprising:
-the first receiver module 114 is used to receive the request from the specific user, asks specific video stream thus;
-the second receiver module 115 is used to receive the described specific video stream from video source;
It is characterized in that described Zapping agent system also comprises:
-storage module 116, it is coupled to described second receiver module, be used for historical video data packets, be stored in the first in first out structure memory 113 continuous a plurality of somes of the nearest video data packets of the current described specific video stream that is forwarded and front institute adjacency thereof;
-channel sending module 117, it is coupled to described first receiver module 114, described second receiver module 115 and described first in first out structure memory 113, is used for:
-in case receive described specific user's request, just send described specific video stream to described specific user according to one of following dual mode,
Mode one: send described specific video stream from described first in first out structure memory 113 to described specific user earlier, send described specific video stream from described video source to described specific user again.Promptly send described specific video stream to described specific user from described first in first out structure memory 113, and, when a video data packets that receives described specific video stream from described video source, and in the time of it can being used for further transmitting, if the video data packets of 113 li any one stored described specific video streams of described first in first out structure memory this moment, all sent to described specific user, stop so sending video flowing to described specific user from described first in first out structure memory 113, and transmit a described video data packets and follow-up video data packets to described specific user from described video source; Otherwise, continue to send described specific video stream to described specific user, and a described video data packets be stored in the described first in first out structure memory 113 from described first in first out structure memory 113.
Mode two: send described specific video stream from described first in first out structure memory 113 and described video source to described specific user simultaneously.Promptly 113 transmit described specific video stream to described specific user from described video source; Meanwhile, send described specific video stream from described first in first out structure memory 113 to described specific user, if the video data packets of 113 li any one stored described specific video streams of described first in first out structure memory, all sent to described specific user, stop so sending described specific video stream to described specific user from described first in first out structure memory 113, otherwise, continue to send described specific video stream from described first in first out structure memory 113 to described specific user simultaneously.
Can constitute the part of video server 11 according to Zapping agent of the present invention system.
Can constitute the part of intermediary network device 12 according to Zapping agent of the present invention system.
Description of drawings
In conjunction with the accompanying drawings, by the description of reference the following examples, above-mentioned and other purpose of the present invention and feature will become more obvious, and the present invention itself will obtain best understanding, wherein:
Fig. 1 a shows mobile TV system 1, and it comprises video server 11, intermediary network device 12 and at the client device (CPE) 13 of specific user position;
Fig. 1 b shows mobile TV system 2, and wherein video flowing VS1 to VSN is available at video server 11 places only;
Fig. 2 has illustrated two video flowing VSm (1≤m≤N, m ≠ n) represent with the time shaft of VSn;
Fig. 3 is according to Zapping agent of the present invention system;
Fig. 4 a represents according to the mode one pairing time shaft of channel handoff procedure of the present invention;
Fig. 4 b represents according to the mode two pairing time shafts of channel handoff procedure of the present invention.
Embodiment
Fig. 3 has described Zapping agent system 101, and it comprises:
-the first communication port 111, specific user usrX is coupled to this first communication port,
-second communication port one 12, video source are coupled to this second communication port,
-first in first out (FIFO) cache memory 113,
-the first receiver module 114, its by first communication port 111 with switch client at the channel of user usrX position and be connected,
-the second receiver module 115, it is connected with video source by second communication port one 12,
-storage module 116,
-channel sending module 117.
In a preferred embodiment of the invention, Zapping agent system 101 forms the part of Node B (NodeB).
First receiver module 114 is coupled to first communication port 111 and channel sending module 117.Second receiver module 115 is coupled to second communication port one 12, storage module 116 and channel sending module 117.Storage module 116 also is coupled to first in first out (FIFO) cache memory 113.Channel sending module 117 also is coupled to first in first out (FIFO) cache memory 113 and first communication port 111.
Storage module 116 writes video data packets in first in first out (FIFO) cache memory 113.
First receiver module 114 is suitable for receiving the channel switching signal of switching client from channel, the channel that please look for novelty (seeing the zap_chn among Fig. 3) thus.So, thereby first receiver module 114 triggers 117 beginnings of channel sending module to the new channel (seeing the start_chn among Fig. 3) of user usrX transmission.
Second receiver module 115 is suitable for receiving the video data packets from the new channel of video source.Video data packets is available for storage module 116 and channel sending module 117.
Continuous a plurality of video data packets that storage module 116 is suitable for transmitting recently are stored in first in first out (FIFO) cache memory 113.In case receive the new video data packets from second receiver module 115, storage module 116 just can be stored into it in first in first out (FIFO) cache memory 113.The present invention suggestion, the maximum amount of data sizableness that the video data packets of the initial stored some of 113 li of first in first out (FIFO) cache memories, the data total amount of these video data packets can be when being used to carry a complete GoP.
Channel sending module 117 is suitable for from the grouping of first in first out (FIFO) cache memory 113 reading video datas, and makes them can be used for further transmitting to user usrX.According to the triggering (seeing the start_chn among Fig. 3) from first receiver module 114, channel sending module 117 reads first grouping of 113 li of first in first out (FIFO) cache memories that are associated with new channel.
Channel sending module 117 also is suitable for obtaining video data packets from second receiver module 115.Channel sending module 117 also be suitable for selecting from first in first out (FIFO) cache memory 113 and (or) second receiver module 115 sends video data packets to user usrX.
More particularly, according to mode one, when the channel that please look for novelty, channel sending module 117 selects to send to user usrX from first in first out (FIFO) cache memory 113 video data packets of new channel, and when newly to video data packets when can be used for further transmitting, if the video data packets of 113 li institutes of first in first out (FIFO) cache memory buffer memory was all sent, channel sending module 117 is selected to send video data packets from second receiver module 115 to user usrX; If the video data packets of 113 li institutes of first in first out (FIFO) cache memory buffer memory was not also all sent, 117 select to continue to send the video data packets that those were not sent out from first in first out (FIFO) cache memory 113 to user usrX, and by storage module 116 will be newly to video data packets be stored in first in first out (FIFO) cache memory 113.
Perhaps, according to mode two, when the channel that please look for novelty, channel sending module 117 sends the video data packets of new channel simultaneously to user usrX from first in first out (FIFO) cache memory 113 and second receiver module 115, till the video data packets of 113 li institutes of first in first out (FIFO) cache memory buffer memory was all sent, channel sending module 117 was selected only to continue to send video data packets from second receiver module 115 to user usrX again.
The operation of Zapping agent system 101 will be carried out with reference to figure 3 and Fig. 4 a, Fig. 4 b.
Mobile phone television user usrX switches to channel chn.Channel switches client and sends channel switching signal zap_chn to Zapping agent system 101, asks channel chn thus.This channel switching signal zap_chn is received by first receiver module 114 at moment t_zap, and forwarding video data grouping simultaneously.
In a preferred embodiment of the invention, video channel chn is encoded as the video sequence of IBBPBBPBBP form.
If use another sequence and/or other frame type, then this specification will be remained valid.
In mode one is example, in case receive channel switching signal zap_chn, first receiver module 114 just triggers channel sending module 117, so that begin from first in first out (FIFO) cache memory 113 reading and sending video data packets.
Then, channel sending module 117 begins from the grouping of first in first out (FIFO) cache memory 113 reading video datas, and sends these video data packets to user usrX.
When newly to video data packets can be used for further forwarding, and it is out-of-date that all video data packets of 113 li buffer memorys of first in first out (FIFO) cache memory are all sent, second receiver module 115 make described newly to video data packets can be used for channel sending module 117, to be used for further transmission.Channel sending module 117 is transmitted this video data packets and video data packets subsequently thereof to user usrX.If newly arrived video data packets, but the video data packets of 113 li institutes of first in first out (FIFO) cache memory buffer memory was not also all sent, then channel sending module 117 continues to send the video data packets that those were not sent out from first in first out (FIFO) cache memory 113 to user usrX, and, second receiver module 115 make described newly to video data packets can be used for storage module 116, storage module 116 with described newly to video data packets be stored in first in first out (FIFO) cache memory 113.
Channel sending module 117 can stop to send packet from first in first out (FIFO) cache memory 113, can also keep the reading video data grouping as the situation of preferred embodiment, in fact no longer sends to user usrX.
When channel switched, according to aforementioned channel sending method, Zapping agent 101 can send a large amount of frame of video to client in the short period of time with fast as far as possible speed, makes the decoding buffer of client can receive a plurality of frame of video quickly.
Among Fig. 4 a, the decoding of client is play constantly from t_streaming.And at t1 in the time period between the t2, Zapping agent has sent the video data packets PIBBPB of the channel chn that is buffered and follow-up video data packets BPBBPIBBPBBP thereof apace to the user, make the buffer memory of client lay in the plurality of video frame quickly, and have benefited from Zapping agent sends characteristics from successive video frames to client, the image that client shows will be continuous, thereby eliminate the phenomenon of mismatch (visual low-frequency disturbance).
Fig. 4 b has provided mode two, and the decoding of client is play constantly from t_streaming.And at t1 in the time period between the t2, Zapping agent has sent the video data packets PIBBPB of the channel chn that is buffered apace to the user, also sent the follow-up video data packets BPBBPIBBPBBP that is just transmitting to the user concurrently simultaneously, make the buffer memory of client lay in the plurality of video frame quickly, and have benefited from Zapping agent sends characteristics from successive video frames to client, the image that client shows fast will be continuous, thereby eliminate the phenomenon of mismatch (visual low-frequency disturbance).
The present invention's suggestion: when mobile phone television user switches to a new channel, interface aloft, the needed channel program of network node user by one or more proprietary transmission channels and (or) several Common transport channels (as forward access channel FACH), send to user terminal apace.And, from the current video packet data of transmitting of the received video packets of data includes network of network a part of historical data before, said here historical data promptly is the Zapping agent institute buffer memory by the mobile TV network node to described user terminal at first.Like this, in can be in the short-term that changes the platform initial stage received a large amount of (cause of the transmitting fast) video data packets of mobile phone, in bigger time span scope, select I frame and subsequent video frame data thereof, this has just improved that mobile phone finds sooner can be by the possibility of independent decoded video frames, thus the video presentation speed when accelerating mobile TV program and changing platform.Though example is the mobile TV system that is used for based on the mobile network herein, its basic thought also is applicable to the mobile TV system and the mobile phone advertisement system of other types.
In optional embodiment of the present invention, Zapping agent system 101 has formed the part of video server.If like this, port one 11 will be represented the intercommunication port towards the coding module of putting altogether, and second receiver module 115 for example will be reduced to by shared storage and obtain video flowing and transmit the basic function of video datas to storage module 116 and channel sending module 117, and equally this second receiver module can with one or two merging in these two modules.
For purpose easily, according to the order that shows, on video flowing time shaft separately, described this video flowing as far as possible, but should be appreciated that actual sending order may (and probably) be different.
Should be noted that at last above according to functional block description embodiments of the invention.According to the functional description of these pieces that provide above, for the technical staff in design of electronic devices field, the embodiment that how to utilize known electronic unit to make these pieces is conspicuous.Therefore do not provide the detailed structure of the content of described functional block.
Claims (4)
1. one kind is used for the method that the mobile TV system sends video information, comprises the following steps:
-receive request from the specific user, ask specific video stream thus;
-reception is from the described specific video stream of video source;
-with the historical video data packets of continuous a plurality of somes of the nearest video data packets of the current described specific video stream that is forwarded and front institute adjacency thereof, be stored in the first in first out structure memory (113);
-send described specific video stream according to one of following dual mode to described specific user:
Mode one, send described specific video stream from described first in first out structure memory (113) to described specific user, and, when a video data packets that receives described specific video stream from described video source, and in the time of it can being used for further transmitting, if the video data packets arbitrarily that the stored described specific video in described first in first out structure memory (113) lining this moment flows, all sent to described specific user, stop so sending video flowing to described specific user from described first in first out structure memory (113), and transmit a described video data packets to described specific user from described video source, with follow-up video data packets, otherwise, continuation sends described specific video stream from described first in first out structure memory (113) to described specific user, and a described video data packets is stored in the described first in first out structure memory (113);
Mode two, transmit described specific video stream from described video source to described specific user, send described specific video stream from described first in first out structure memory (113) to described specific user simultaneously, if any one video data packets of the described specific video stream that described first in first out structure memory (113) lining is stored, all sent to described specific user, stop so sending described specific video stream to described specific user from described first in first out structure memory (113), otherwise, continue to send described specific video stream from described first in first out structure memory (113) to described specific user simultaneously.
2. Zapping agent system (101) that uses the described method of claim 1 comprising:
-the first receiver module (114) is used to receive the request from the specific user, asks specific video stream thus;
-the second receiver module (115) is used to receive the described specific video stream from video source;
It is characterized in that described Zapping agent system also comprises:
-storage module (116), it is coupled to described second receiver module, be used for historical video data packets, be stored in the first in first out structure memory (113) continuous a plurality of somes of the nearest video data packets of the current described specific video stream that is forwarded and front institute adjacency thereof;
-channel sending module (117), it is coupled to described first receiver module (114), described second receiver module (115) and described first in first out structure memory (113), is used for:
-in case receive described specific user's request, just send described specific video stream to described specific user according to one of following dual mode:
Mode one, send described specific video stream from described first in first out structure memory (113) to described specific user, and, when a video data packets that receives described specific video stream from described video source, and in the time of it can being used for further transmitting, if any one video data packets that the stored described specific video in described first in first out structure memory (113) lining this moment flows, all sent to described specific user, stop so sending video flowing to described specific user from described first in first out structure memory (113), and transmit a described video data packets to described specific user from described video source, with follow-up video data packets, otherwise, continuation sends described specific video stream from described first in first out structure memory (113) to described specific user, and a described video data packets is stored in the described first in first out structure memory (113);
Mode two, transmit described specific video stream from described video source to described specific user, send described specific video stream from described first in first out structure memory (113) to described specific user simultaneously, if any one video data packets of the described specific video stream that described first in first out structure memory (113) lining is stored, all sent to described specific user, stop so sending described specific video stream to described specific user from described first in first out structure memory (113), otherwise, continue to send described specific video stream from described first in first out structure memory (113) to described specific user simultaneously.
3. according to the Zapping agent system of claim 2, it is characterized in that the part of described Zapping agent system's formation video server (11).
4. according to the Zapping agent system of claim 2, it is characterized in that the part of described Zapping agent system's formation intermediary network device (12).
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| CN101420490A (en) * | 2008-05-30 | 2009-04-29 | 北京天腾时空信息科技有限公司 | Data reading method and device |
| CN102143132A (en) * | 2010-08-10 | 2011-08-03 | 华为技术有限公司 | Frequency channel switching method, switching agency, client and terminal for stream media |
| CN102487392A (en) * | 2010-12-01 | 2012-06-06 | 深圳市同洲软件有限公司 | Method, device and system for interaction between digital television receiving terminal and mobile terminal |
| CN105187895B (en) * | 2015-09-17 | 2019-03-12 | 暴风集团股份有限公司 | For the hardware-accelerated data cache method and system for playing video of mobile platform |
| CN107690073B (en) * | 2016-08-05 | 2021-07-16 | 阿里巴巴集团控股有限公司 | Video live broadcast method and video live broadcast server |
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