CN101668210A - Transmission method of broadcast quality audio and video based on commercial wireless network - Google Patents
Transmission method of broadcast quality audio and video based on commercial wireless network Download PDFInfo
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Abstract
The invention relates to a transmission method of broadcast quality audio and video based on a commercial wireless network. At present, the wireless live rebroadcast technology has great limitations.The method of the invention comprises the following steps: firstly receiving a mixed audio and video steaming in a camera; transmitting the mixed audio and video streaming to a standard encoder; carrying out compression coding on the mixed audio and video streaming in the standard encoder to obtain a compressed TS code stream; processing the compressed TS code stream to obtain a multi-channel codestream; transmitting the multi-channel code stream into an objective server through the commercial wireless network and Internet at real time in a concurrent manner; rearranging and recovering the received multi-channel code stream into a complete compressed code stream by the objective server, and transmitting the complete compressed code stream to the standard encoder; and carrying out decodingand uncompressing processes on the recovered compressed code stream through the standard encoder to obtain the audio data stream and video data stream shot by a broadcast quality camera. The method of the invention can simultaneously switch in multiple commercial wireless networks and Internet, transmits the audio data stream and the video data stream shot by the broadcast quality camera into television stations at real time, thus improving the instantaneity of news.
Description
Technical field
The invention belongs to the signal transmission technology field, relate to a kind of transmission method of broadcast quality audio and video based on commercial wireless network.Specifically, relate to a kind of real-time code stream that the broadcast level video camera is taken and carry out the broadcast quality audio and video compressed encoding, and to the processing that compressed bit stream is cut apart and distributed, the multichannel code stream that obtains carries out the method for concurrent transmission by commercial wireless network.
Background technology
At present, TV station uses the wireless technology of relaying live only to only limit to microwave mobile control room system, and this system not only costs an arm and a leg, and also inconvenience is arranged in the action more, so generally except especially big news, TV station seldom sets out the microwave mobile control room.In the ordinary course of things, all be that the content of taking is directly taken back TV station after interview is finished, if the spot for photography is far away apart from TV station, then to spend the more time could send content of shooting back to TV station, obviously this has influenced the real-time of news to a certain extent.After the wireless network and mobile network's appearance of commercialization, it is convenient, quick that the transmission of data becomes.As long as in the area of coverage of network signal, just can transmit the multi-medium data that collects whenever and wherever possible, eliminated the region restriction of using cable network to cause.But present broadcast level video camera does not support directly to insert the transmission that commercial wireless network carries out audio/video flow.
(Serial Digital Interface, SDI) normal data stream has very high code check to the serial digital interface that obtains from the broadcast level video camera, because wireless network bandwidth is limited, need carry out compressed encoding to the high-speeld code-flow from video camera.H.264 standard is compared with compression technology such as MPEG-2, under equal picture quality, adopt the data volume after the technique compresses H.264 to have only the 1/2-1/3 of MPEG-2, and all be better than compression standards such as MPEG-2 aspect code efficiency, picture quality, network compatibility and the anti-error code.It has been introduced towards the encoding mechanism of IP bag, helps the transmitted in packets in the network, the Streaming Media of video transmission in the network enabled.H.264 have stronger anti-bit error performance, can adapt to the video transmission in the wireless channel of packet loss height, serious interference.H.264 also support the hierarchical coding transmission under the heterogeneous networks resource, thereby obtain picture quality stably, can be adapted to the video transmission in the heterogeneous networks.And the AVS standard be based on China's innovative technology and part public technology from primary standard, code efficiency than the high 2-3 of MPEG-2 doubly, with H.264 suitable, and technical scheme is succinct, the chip implementation complexity is low.Having distinctive core technology in the middle of the AVS video comprises: filtering etc. in 8 * 8 integer transforms, quantification, infra-frame prediction, 1/4 precision pixels interpolation, special inter prediction motion compensation, two-dimensional entropy coding, the deblocking effect ring.
Supplementary classification standard based on the Video service quality is mainly to be divided into three grades of auxiliary criterias according to image sharpness, and wherein the first order is broadcast level, and broadcast level is divided into two grades again, high definition and single-definition.The SDI code stream that obtains from the broadcast level video camera comprises that code check is the SD code stream of 270Mbps and the high definition code stream that code check is 1.5Gbps or 3Gbps.For the high definition code stream, the code check after the audio frequency and video of broadcast level require to compress is more than 10Mbps; And for the SD code stream, code check after the audio frequency and video of broadcast level require to compress is about 2Mbps, obviously compare with conventional audio/video flow, code check after the compression of the audio frequency and video of broadcast level is higher, and it is all higher to the requirement of the requirement (such as bandwidth, the error rate etc.) of wireless channel and whole transmission system therefore to transmit the audio/video flow of broadcast level.In order to guarantee low packet loss and low Packet Error Ratio, the design of whole system and the algorithm of wherein using are different during all with the conventional code stream of wireless transmission in the past.
At present, main commercial wireless network comprises WLAN (wireless local area network), wireless MAN and mobile network.Wherein the main technical standards of WLAN (wireless local area network) is Wi-Fi
TMTechnology, the IEEE 802.11b standard of this technology is a current application wlan standard the most widely, and adopting wave band is 2.4GHz, and this frequency range still belongs to the radio band that need not permit at present, and Wi-Fi
TMIt is 5.2GHz that the IEEE 802.11a standard of technology adopts wave band, but because the restriction of relevant laws and regulations, makes the 5.2GHz frequency range get the Green Light and approve that what therefore adopt at present all is the 2.4GHz frequency range in each country of the whole world.The place of personnel's comparatively denses such as operator needs only on the airport, station, cafe, library is provided with " focus ", just can the internet be inserted above-mentioned place by high-speed line.Wi-Fi
TMAdvantage be the bandwidth height, shortcoming then is that coverage is less.The main technical standards of commercial wireless MAN is WiMax
TMTechnology.WiMax
TMCoverage is bigger, and is also higher with Time Bandwidth, but also is in the try net stage now in China.Mobile network's main technical standards mainly comprises W-CDMA, CDMA2000 and the TD-SCDMA of GSM/GPRS technology, CDMA1X and the 3G of 2G.Mobile network's advantage is that coverage is bigger, and shortcoming is the relative Wi-Fi of bandwidth
TMLower.
Summary of the invention
Purpose of the present invention just provides a kind of transmission method of the broadcast quality audio and video based on commercial wireless network, can insert a plurality of commercial wireless networks and Internet simultaneously by this method, the data flow transmission that the broadcast level video camera is taken is to TV station in real time.Like this, after interview is finished,, improved the real-time of news as long as just direct transmitting data stream of place that wireless network covers is arranged near finding.
The concrete steps of the inventive method are:
Step (1) receives mixing audio/video flow the video camera from the SDI interface of broadcast level video camera, and will mix audio/video flow and be transferred to standard coders; Described standard coders adopts H.264 standard or AVS standard;
Carry out compressed encoding to mixing audio/video flow in step (2) standard coders, obtain compressing the TS code stream;
Step (3) will be compressed the TS code stream and handle and obtain the multichannel code stream; Described compression TS code stream comprises that speed is the enhancement layer bitstream of 2Mbps and the basic layer bit stream that speed is 500Kbps, wherein basic layer bit stream is a high-transmission priority, can guarantee basic viewing effect, enhancement layer bitstream is a low transmission priority, guarantees on basic viewing effect to carry out perfect to the definition of picture, resolution etc.;
Step (4) is sent to destination server in concurrent mode with the multichannel code stream in real time by commercial wireless network and Internet;
Step (5) is reset the multichannel code stream that receives at the destination server place and is recovered complete compressed bit stream, and is sent to standard decoder; Described standard decoder adopts H.264 standard or AVS standard;
The compressed bit stream that step (6) recovery is come out obtains the audio and video data streams that the broadcast level video camera is taken through the decoding decompression of standard decoder.
Compression TS code flow processing method specifically comprises code stream dividing processing and the processing of code stream dynamic assignment in the step (3);
The code stream dividing processing is according to transmission priority compression TS code stream to be cut apart, and obtains having the two-way code stream of high-transmission priority and low transmission priority;
It is according to quality of wireless network the two-rail code that is obtained by the code stream dividing processing to be flow to action attitude allocation process to obtain the multichannel code stream that the code stream dynamic assignment is handled, concrete grammar is: when the bandwidth that detects each bar link under the current state all greater than preset threshold B, B=500Kbps, then the code stream with high-transmission priority repeats to be sent in each bar link, and the code stream selection of a low transmission priority wherein link of maximum bandwidth sends; When under detecting current state, having the bandwidth of bandwidth all the other links of some links not enough greater than preset threshold, the code stream that then will have high-transmission priority repeats to be sent in these some links, and one with bandwidth maximum in these some links of code stream selection of low transmission priority sends; When the bandwidth of each bar link is all not enough under detecting current state, then abandon current code stream with low transmission priority, do not enter the transmission process, code stream with high-transmission priority does not then temporarily send, after improving, the bandwidth conditions of wait link sent again, start error counter simultaneously, packet number in the code stream that counting does not send continuously with high-transmission priority, if counting surpasses the threshold value of setting in advance, then system prompt network congestion stops to receive the SDI data flow from the broadcast level camera acquisition, during the counting simultaneously, if successfully send the code stream of current high-transmission priority, then counter O reset.
The beneficial effect that the present invention compared with prior art has:
(1) the invention solves the broadcast level video camera and take the problem finish back audio/video flow real-time Transmission,, need only at nearest Wi-Fi by the present invention
TM" focus " thus near or the place that has wireless network to cover just can connect commercial wireless network and pass the content of shooting back TV station apace, guaranteed the real-time of news.
What (2) the present invention was transmitted is the broadcast quality audio and video stream with higher code check.
(3) the present invention can insert a plurality of networks simultaneously, in concurrent mode multi-medium data is transferred to destination server in real time, has overcome the bandwidth bottleneck that uses single network to cause, can satisfy higher real-time requirement; Do not need operator that special-purpose high-speed transfer link is provided, reduced the cost of multimedia service.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
Embodiment
Embodiments of the invention are below described.
A kind of transmission method of the broadcast quality audio and video based on commercial wireless network, the SDI code stream that can receive the broadcast level video camera carry out encoding compression, cut apart and dynamic assignment is handled the back and concomitantly compressed bit stream is sent to destination server by wireless commercial network.This method is applicable to the real-time multimedia data transmitting scene.This method receives from the mixing audio/video flow of broadcast level video camera and carries out code stream and handle, set up with the wireless network of different operator or wireless network simultaneously to connect, by the concurrent transmission of these commercial wireless networks through handling the TS code stream.The described network that belongs to different operators can be the network of same type, also networks of different type, with three networks is that example illustrates, they can all be WLAN, WMAN or all be the hybrid networks of 2G and 3G, perhaps one of them network is WLAN, and two other network is the hybrid network of WMAN or 2G and 3G, perhaps three hybrid networks that network is respectively WALN, WMAN and 2G and 3G.The standard of above-mentioned WLAN is meant the Wi-Fi based on IEEE802.11
TM, the standard of WMAN is meant the WiMax based on IEEE802.16
TM, the standard of 3G network is meant one of W-CDMA, CDMA2000, TD-SCDMA.These commercial wireless networks finally insert Internet, so receiving terminal does not need other hardware supports, only require to connect Internet, just can receive the TS code stream and the decompression of decoding recovers complete audio/video flow.Based on this method, broadcast camera does not need content of shooting is brought back TV station after taking and finishing, as long as and find nearest Wi-Fi
TMThe place that " focus " located or had wireless network to cover directly connects the wireless transmission that commercial wireless network just can carry out broadcast quality audio and video stream.This method can also be simultaneously connects with the network of different operator, transmits the multichannel code stream concomitantly, therefore also can shorten the required time of transmission, guarantees in the shortest time content of taking to be sent back to destination server.
Fig. 1 is based on the flow chart of the transmission method of broadcast quality audio and video of commercial wireless network.This method receives from the broadcast level video camera mixes audio-video code stream, the TS code stream that obtains behind the compressed encoding is cut apart with dynamic assignment handled, and by commercial wireless network the broadcast quality audio and video code stream is transferred to destination server.Concrete steps are as follows:
Step (1) receives mixing audio/video flow the video camera from the SDI interface of broadcast level video camera, and will mix audio/video flow and be transferred to standard coders; Described standard coders adopts H.264 standard or AVS standard;
Carry out compressed encoding to mixing audio/video flow in step (2) standard coders, obtain compressing the TS code stream;
Step (3) will be compressed the TS code stream and handle and obtain the multichannel code stream; Described compression TS code stream comprises that speed is the enhancement layer bitstream of 2Mbps and the basic layer bit stream that speed is 500Kbps, wherein basic layer bit stream is a high-transmission priority, can guarantee basic viewing effect, enhancement layer bitstream is a low transmission priority, guarantees on basic viewing effect to carry out perfect to the definition of picture, resolution etc.;
Step (4) is sent to destination server in concurrent mode with the multichannel code stream in real time by commercial wireless network and Internet;
Step (5) is reset the multichannel code stream that receives at the destination server place and is recovered complete compressed bit stream, and is sent to standard decoder; Described standard decoder adopts H.264 standard or AVS standard;
The compressed bit stream that step (6) recovery is come out obtains the audio and video data streams that the broadcast level video camera is taken through the decoding decompression of standard decoder.
Compression TS code flow processing method specifically comprises code stream dividing processing and the processing of code stream dynamic assignment in the step (3);
The code stream dividing processing is according to transmission priority compression TS code stream to be cut apart, and obtains having the two-way code stream of high-transmission priority and low transmission priority;
It is according to quality of wireless network the two-rail code that is obtained by the code stream dividing processing to be flow to action attitude allocation process to obtain the multichannel code stream that the code stream dynamic assignment is handled, concrete grammar is: when the bandwidth that detects each bar link under the current state all greater than preset threshold B, B=500Kbps, then the code stream with high-transmission priority repeats to be sent in each bar link, and the code stream selection of a low transmission priority wherein link of maximum bandwidth sends; When under detecting current state, having the bandwidth of bandwidth all the other links of some links not enough greater than preset threshold, the code stream that then will have high-transmission priority repeats to be sent in these some links, and one with bandwidth maximum in these some links of code stream selection of low transmission priority sends; When the bandwidth of each bar link is all not enough under detecting current state, then abandon current code stream with low transmission priority, do not enter the transmission process, code stream with high-transmission priority does not then temporarily send, after improving, the bandwidth conditions of wait link sent again, start error counter simultaneously, packet number in the code stream that counting does not send continuously with high-transmission priority, if counting surpasses the threshold value of setting in advance, then system prompt network congestion stops to receive the SDI data flow from the broadcast level camera acquisition, during the counting simultaneously, if successfully send the code stream of current high-transmission priority, then counter O reset.
The code stream dividing processing is cut apart the TS code stream that receives according to different transmission priorities, obtains having the two-way code stream of high-transmission priority and low transmission priority; It is that quality condition according to network flows to the action attitude to two-rail code and distributes that the code stream dynamic assignment is handled, and obtains the multichannel code stream.For example, be coated with Wi-Fi in the somewhere
TM, WiMax
TMWith three kinds of commercial wireless networks of CDMA2000, three kinds of wireless networks of transmitting terminal device and this have all been set up and have been connected, 3 link: Wi-Fi of promptly current existence
TMLink, WiMax
TMLink and CDMA2000 link; Current, the network measuring submodule detects Wi-Fi
TMLink and WiMax
TMThe quality of link is all comparatively desirable, but while Wi-Fi
TMThe quality of link is than WiMax
TMLink-quality is better, and the quality condition of CDMA2000 link is not ideal enough, and this situation is fed back to Central Control Module; After Central Control Module was learnt current each link-quality, control stream dynamic assignment submodule was responsible for assigning the bit stream data of current high-transmission priority to Wi-Fi
TMLink and WiMax
TMLink is only distributed to Wi-Fi with the bit stream data bag of current low transmission priority simultaneously
TMLink by obtaining the two-way compressed bit stream after distributing and the wireless network by separately transmits, can guarantee minimum Packet Error Ratio and packet loss like this.
Claims (1)
1, a kind of transmission method of broadcast quality audio and video based on commercial wireless network is characterized in that the concrete steps of this method are:
Step (1). receive mixing audio/video flow the video camera from the SDI interface of broadcast level video camera, and will mix audio/video flow and be transferred to standard coders; Described standard coders adopts H.264 standard or AVS standard;
Step (2). carry out compressed encoding to mixing audio/video flow in the standard coders, obtain compressing the TS code stream;
Step (3). will compress the TS code stream and handle and obtain the multichannel code stream; Described compression TS code stream comprises that speed is the enhancement layer bitstream of 2Mbps and the basic layer bit stream that speed is 500Kbps, wherein basic layer bit stream is a high-transmission priority, can guarantee basic viewing effect, enhancement layer bitstream is a low transmission priority, guarantees on basic viewing effect to carry out perfect to the definition of picture, resolution etc.;
Step (4). the multichannel code stream is sent to destination server in concurrent mode in real time by commercial wireless network and Internet;
Step (5). at the destination server place multichannel code stream that receives reset and to recover complete compressed bit stream, and be sent to standard decoder; Described standard decoder adopts H.264 standard or AVS standard;
Step (6). the compressed bit stream that recovery is come out obtains the audio and video data streams that the broadcast level video camera is taken through the decoding decompression of standard decoder;
Compression TS code flow processing method specifically comprises code stream dividing processing and the processing of code stream dynamic assignment in the step (3);
The code stream dividing processing is according to transmission priority compression TS code stream to be cut apart, and obtains having the two-way code stream of high-transmission priority and low transmission priority;
It is according to quality of wireless network the two-rail code that is obtained by the code stream dividing processing to be flow to action attitude allocation process to obtain the multichannel code stream that the code stream dynamic assignment is handled, concrete grammar is: when the bandwidth that detects each bar link under the current state all greater than preset threshold B, B=500Kbps, then the code stream with high-transmission priority repeats to be sent in each bar link, and the code stream selection of a low transmission priority wherein link of maximum bandwidth sends; When under detecting current state, having the bandwidth of bandwidth all the other links of some links not enough greater than preset threshold, the code stream that then will have high-transmission priority repeats to be sent in these some links, and one with bandwidth maximum in these some links of code stream selection of low transmission priority sends; When the bandwidth of each bar link is all not enough under detecting current state, then abandon current code stream with low transmission priority, do not enter the transmission process, code stream with high-transmission priority does not then temporarily send, after improving, the bandwidth conditions of wait link sent again, start error counter simultaneously, packet number in the code stream that counting does not send continuously with high-transmission priority, if counting surpasses the threshold value of setting in advance, then system prompt network congestion stops to receive the SDI data flow from the broadcast level camera acquisition, during the counting simultaneously, if successfully send the code stream of current high-transmission priority, then counter O reset.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049862A (en) * | 2014-04-25 | 2015-11-11 | 统一有限责任两合公司 | Method and device for transmission of encoded media data |
| CN110856077A (en) * | 2014-05-20 | 2020-02-28 | Gn瑞声达A/S | New method for wireless transmission of digital audio |
| WO2022141316A1 (en) * | 2020-12-30 | 2022-07-07 | 深圳市大疆创新科技有限公司 | Image transmission method, movable platform, device, system and readable storage medium |
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2009
- 2009-09-28 CN CN 200910152761 patent/CN101668210B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049862A (en) * | 2014-04-25 | 2015-11-11 | 统一有限责任两合公司 | Method and device for transmission of encoded media data |
| CN105049862B (en) * | 2014-04-25 | 2019-07-09 | 统一有限责任两合公司 | The method and apparatus for being used for transmission coding media data |
| US10516714B2 (en) | 2014-04-25 | 2019-12-24 | Unify Gmbh & Co. Kg | Method and apparatus for transmitting encoded media data |
| CN110856077A (en) * | 2014-05-20 | 2020-02-28 | Gn瑞声达A/S | New method for wireless transmission of digital audio |
| WO2022141316A1 (en) * | 2020-12-30 | 2022-07-07 | 深圳市大疆创新科技有限公司 | Image transmission method, movable platform, device, system and readable storage medium |
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