CN101262321A - Media data processing method, coding device and media platform - Google Patents
Media data processing method, coding device and media platform Download PDFInfo
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- CN101262321A CN101262321A CNA200810057593XA CN200810057593A CN101262321A CN 101262321 A CN101262321 A CN 101262321A CN A200810057593X A CNA200810057593X A CN A200810057593XA CN 200810057593 A CN200810057593 A CN 200810057593A CN 101262321 A CN101262321 A CN 101262321A
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Abstract
The invention provides a media data processing method, a coding device and a media platform. The method comprises the following steps: A1. media data are fragmented by the coding device and frame serial number and packet serial number are distributed to the media data fragmented; A2. the coding device encapsulates the media data fragmented into UDP messages and sends the UDP messages to the media platform and writes the media data sent into a sending buffer cache; A3. the coding device receives retransmission request messages sent by the media platform, takes out corresponding media data from the sending buffer cache according to the frame serial number and pocket serial number of the retransmission request messages, encapsulates the media data into UDP messages and sends the UDP messages to the media platform. Media data are transmitted based on a UDP protocol and marked and retransmitted according to the frame serial number and pocket serial number in the invention, and therefore, low-latency of live images is ensured and reliability of recording is improved.
Description
Technical field
The present invention relates to data handling system and method, particularly a kind of media data processing method, encoding device and media platform.
Background technology
The medium face of typical digitized video supervisory control system (as shown in Figure 1) generally is made up of encoding device, media platform and decoding device.Wherein, encoding device is responsible for gathering the analog audio-video signal, after finishing digitized processing, media data is encapsulated in the IP message sends to media platform; Media platform is responsible for the media data that received code equipment sends, on one side distributing media data flow to decoding device (being called live telecast), generate video file on one side and store, so that carry out the playback of historical data; Decoding device is responsible for the media data that the receiving media platform is transmitted, and media data is carried out exporting analog image to display device (as monitor) after the decoding processing.
In said system, when encoding device sends media data, generally select to be carried on UDP or the TCP message to transmit, below introduce it respectively.
(1) between encoding device and the media platform based on the Transmission Control Protocol transmission of media data.
This technical scheme makes full use of the retransmission mechanism of TCP, realize the reliable transmission of media data between encoding device and media platform, thereby guaranteed that the video file that generates truly reduces the front end image, the quality that can not cause because of Network Packet Loss recording a video generally speaking descends, and the history image that program request is obtained has good continuity.
Network quality between encoding device and media platform is relatively poor, when packet loss is comparatively serious, because affirmation and the retransmission mechanism of TCP, the time-delay that is transmitted to the message of decoding client through media platform must strengthen (with respect to the media data rise time), this at first can cause the time-delay of live image to strengthen the real-time variation; Secondly, encoding device is to generate media data (gathering 25 two field pictures as per second) according to certain speed, when the broad medium data are buffered in device interior owing to the re-transmission of TCP, in the time of can not in time sending out, the memory source of inevitable a large amount of consumer devices, and causing newly-generated loss of data, the media data of being preserved in the present video file of final body is discontinuous.
(2) between encoding device and the media platform based on the udp protocol transmission of media data.
This technical scheme has made full use of the no affirmation mechanism of udp protocol, and media data is transmitted between encoding device and decoding device fast, has guaranteed the low delay of live image.Network quality between encoding device and media platform is relatively poor, when having packet loss, in the video file that media platform generates, must lose some media datas, and in the time of can causing from media file the program request playback history data, image is discontinuous or the flower screen occurs.
In supervisory control system, generally require the live image time delay of decoding end output little, and image is continuous; Simultaneously, require recording function to want reliable, video file can be recorded the image information of gathering truly, just requires recording function that anti-packet loss ability is preferably arranged, and the history image that program request obtains has continuity.And from the above description as can be known, prior art adopts UDP or Transmission Control Protocol media data all can not satisfy these requirements, therefore, need improve and perfect the prior art scheme.
Summary of the invention
Technical problem to be solved by this invention provides a kind of media data processing method, encoding device and media platform, the reliability of recording a video when improving based on the udp protocol transmission of media data.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of media data processing method comprises the steps:
A1, encoding device carry out burst to media data, are the media data distribution number of frames and the packet number of burst;
A2, encoding device are packaged into the UDP message with the media data of burst and send to media platform, and the media data that will send writes the transmission buffer area;
The repeat requests message that A3, encoding device receiving media platform send, according to number of frames in the repeat requests message and packet number, the corresponding media data of taking-up is packaged into the UDP message and sends to media platform from send buffer area.
Above-mentioned method, in the steps A 2, encoding device is before the media data that will send writes the transmission buffer area, judge also whether send buffer area is about to full, if deletion writes the transmission buffer area with the described media data that has sent after sending media data the oldest in the buffer area again.
Above-mentioned method, in the steps A 3, encoding device is behind the repeat requests message that receives the media platform transmission, whether the media data of also judging number of frames in the repeat requests message and packet number correspondence is present in sends in the buffer area, do not send in the buffer area if the media data of described correspondence is not present in, then this repeat requests message is not responded.
Above-mentioned method, in the steps A 3, encoding device also is provided with the re-transmission mark to corresponding media data before carrying out described UDP message encapsulation;
A kind of media data processing method comprises the steps:
The media data that B1, media platform received code equipment send, and the media data that receives write the reception buffer area;
B2, media platform judge whether the media data that receives the oldest frame/frame group in the buffer area is complete, if, the media data of this frame/frame group is write video file, otherwise, send the repeat requests message to encoding device, comprise in the described repeat requests message lose the number of frames and the packet number of media data;
Above-mentioned method also comprises after the step B1: media platform judges whether receive buffer area reaches the default buffer memory upper limit, if directly the media data that will receive in the buffer area writes video file.
After above-mentioned method, media platform will receive media data in the buffer area and write video file, also the media data that writes is deleted from receive buffer area.
Above-mentioned method, among the step B1, media platform also is transmitted to decoding device with the described media data that receives behind the media data that receives the encoding device transmission.
Above-mentioned method, among the step B1, media platform judges also whether the described media data that receives comprises the re-transmission mark, if this is not comprised the media data that retransmits mark and transmit behind the media data that receives the encoding device transmission.
A kind of encoding device comprises, media data burst module, media data sending module, transmission buffer memory and repeat requests message receiver module, wherein:
Described media data burst module is used for media data is carried out burst, is the media data distribution number of frames and the packet number of burst;
Described media data sending module, being used for media data with burst is packaged into the UDP message and sends to media platform, and the media data that will send writes the transmission buffer memory, and according to number of frames in the repeat requests message and packet number, the corresponding media data of taking-up is packaged into the UDP message and sends to media platform from send buffer memory;
Described repeat requests message receiver module is used for lose comprising of receiving media platform the transmission number of frames of media data and the repeat requests message of packet number.
Above-mentioned encoding device, wherein, described media data sending module is before the media data that will send writes the transmission buffer memory, judge also whether send buffer memory is about to full, if deletion writes the transmission buffer memory with the described media data that has sent after sending media data the oldest in the buffer memory again.
Above-mentioned encoding device, wherein, described media data sending module also is provided with the re-transmission mark to corresponding media data before carrying out described UDP message encapsulation.
A kind of media platform comprises, media data receiver module, reception buffer memory, video file generation module and repeat requests message sending module, wherein:
Described media data receiver module is used for the media data that received code equipment sends, and the media data that receives is write the reception buffer memory;
Described video file generation module is used for when the media data that determine to receive the oldest frame of buffer memory/frame group is complete, and the media data of this frame/frame group is write video file;
Described repeat requests message sending module, be used for when the media data of determining the oldest frame of reception buffer memory/frame group is imperfect, send the repeat requests message to encoding device, comprise in the described repeat requests message lose the number of frames and the packet number of media data.
Above-mentioned media platform, wherein, described video file generation module is used to also judge whether receive buffer memory reaches the default buffer memory upper limit, if directly the media data that will receive in the buffer memory writes video file.
Above-mentioned media platform wherein, after described video file generation module will receive media data in the buffer memory and write video file, is also deleted the media data that writes from receive buffer memory.
Above-mentioned media platform wherein, also comprises the media data forwarding module: described media data forwarding module is used for the media data that the media data receiver module receives is transmitted to decoding device.
Above-mentioned media platform, wherein, described media data forwarding module judges also whether the described media data that receives comprises the re-transmission mark, if this is not comprised the media data that retransmits mark and transmit.
Compared with prior art, the invention has the beneficial effects as follows:
Media data transmits based on udp protocol, and according to number of frames and packet number media data is identified and retransmits, and in the low delay that guarantees live image, has improved the reliability of video recording.
Description of drawings
Fig. 1 is the digitized video supervisory control system structural representation of prior art;
Fig. 2 is the structural representation of the media data treatment system of the embodiment of the invention;
Fig. 3 is the encoding device workflow diagram among Fig. 2;
Fig. 4 is the media platform workflow diagram among Fig. 2.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Please refer to Fig. 2, the media data treatment system of the embodiment of the invention comprises encoding device 10, media platform 20 and decoding device 30.Between encoding device 10 and the media platform 20, all interconnect between media platform 20 and the decoding device 30 by IP network.
Particularly, encoding device 10 comprises media data burst module 11, media data sending module 12, sends buffer memory 13, repeat requests message receiver module 14; Media platform 20 comprises media data receiver module 21, receives buffer memory 22, video file generation module 23, repeat requests message sending module 24, media data forwarding module 25.
After encoding device 10 collects the analog audio-video signal, described audio-video signal is carried out digitized processing, generate media data.Media data burst module 11 is used for media data is carried out burst, media data distribution number of frames and packet number for burst, encoding device is based on number of frames and packet number management of media data, all media datas of one two field picture use identical number of frames, and the media data that is encapsulated in the different IP message of same two field picture uses the packet number unique identification; Media data sending module 12 is used for media data with burst and is packaged into the UDP message and sends to media platform 20, and the media data that will send writes and sends buffer memory 13.Wherein, encoding device 10 uses number of frames and packet number to manage the media data that sends in the buffer memory 13.
Media data receiver module 21 in the media platform 20 is used for the media data that received code equipment 10 sends, and the media data that receives is write reception buffer memory 22.Wherein, the media data flow that media platform 20 need be recorded a video for each road is created one and is received buffer memory, that is to say, comprises a plurality of reception buffer memorys 22 in the media platform 20.Media data receiver module 21 is written to this media data in the corresponding reception buffer memory 22 according to the number of frames and the packet number of media data.
Video file generation module 23 in the media platform 20 is used for judging whether the media data that receives buffer memory 22 the oldest frame/frame groups is complete, if, the media data of this frame/frame group is write video file, otherwise, send the repeat requests message to encoding device 10 by repeat requests message sending module 24.
Described repeat requests message transmits based on udp protocol, below the exemplary a kind of definition that provides repeat requests message payload format, as shown in the table:
Wherein:
The Number:4 byte, the quantity of the media data burst of this request;
The sequence number of frame under the Frame Sequence:4 byte, the media data burst of being asked;
Packet number under Packet Sequence:4 byte, the media data of being asked are distributed in the frame;
As can be seen, media platform 20 sends a repeat requests message, can ask a plurality of media data bursts of losing simultaneously.
Repeat requests message receiver module 14 in the encoding device 10 is used for the repeat requests message of flat 20 transmissions of receiving media, media data sending module 12 is searched corresponding media data according to number of frames in the repeat requests message and packet number from send buffer memory 13, if find, then corresponding media data is packaged into the UDP message and sends to media platform 20; Otherwise, this repeat requests message is not responded.
Wherein, media platform 20 also judges whether to transmit processing after receiving media data, if then by media data forwarding module 25 the described media data that receives is transmitted to decoding device 30.Whether media platform 20 needs media data is transmitted, can be by determining by the control Signalling exchange between media platform 20 and the decoding device 30.
Decoding device 30 is used for the media data that receiving media platform 20 is transmitted, and media data is carried out exporting analog image to display device (as monitor) after the decoding processing.
In the media data treatment system of the embodiment of the invention, carry out transmission of media data based on the UDP message between encoding device 10 and the media platform 20, guaranteed the low time delay of live image; According to number of frames and packet number media data is identified and retransmits,, can realize reliable video recording, and the message encapsulation format is transparent fully no matter media data uses RTP over UDP or directly use UDP to encapsulate.
In another embodiment of the present invention, the media data that the media data sending module 12 in the encoding device 10 also retransmits needs is provided with the re-transmission mark, and then will be provided with and send to media platform 20 after the media data that retransmits mark is packaged into the UDP message.The identification method that retransmits media data can freely be set according to the encapsulation format of message, and when using the encapsulation of RTP form such as media data, first byte that is provided with in the RTP extended field is 0 * 5.
Correspondingly, the media data forwarding module 25 in the media platform 20 judges also whether the media data that media data receiver module 21 receives comprises the re-transmission mark, if this is not comprised the media data that retransmits mark and transmit.By using special mark to distinguish normal media data and retransmitting media data, when realizing the media data functions of retransmission, can guarantee that decoding device 30 can not receive the media data of re-transmission (when live broadcast, the media data of this re-transmission is an invalid data).
In further embodiment of this invention, video file generation module 23 in the media platform 20 judges also whether receive buffer memory 22 (for example reaches the default buffer memory upper limit, 70%), if, no matter whether then receive the media data of the oldest frame/frame group in the buffer memory 22 complete, the media data that will receive in the buffer memory 22 writes video file immediately, receives new media data to discharge spatial cache, has avoided retransmission mechanism infinitely to take the memory source of media platform 20.
Please refer to Fig. 3, the concrete workflow of encoding device is as follows:
After step 301, encoding device start, distribute to send buffer area;
Whether step 305, judgement send buffer area and are about to expire, if, enter step 306, otherwise, step 307 entered;
Whether step 310 judges N greater than 0, if, enter step 311, otherwise, step 302 returned;
Please refer to Fig. 4, the concrete workflow diagram of media platform is as follows:
Whether the media data that step 406, judgement receive the oldest frame/frame group in the buffer area is complete, if, enter step 407, otherwise, step 408 entered;
In the system and method for the embodiment of the invention, media data transmits based on udp protocol, and according to number of frames and packet number media data is identified and retransmits, and in the low delay that guarantees live image, has improved the reliability of video recording.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (17)
1. a media data processing method is characterized in that, comprises the steps:
A1, encoding device carry out burst to media data, are the media data distribution number of frames and the packet number of burst;
A2, encoding device are packaged into the UDP message with the media data of burst and send to media platform, and the media data that will send writes the transmission buffer area;
The repeat requests message that A3, encoding device receiving media platform send, according to number of frames in the repeat requests message and packet number, the corresponding media data of taking-up is packaged into the UDP message and sends to media platform from send buffer area.
2. media data processing method as claimed in claim 1 is characterized in that:
In the steps A 2, encoding device the media data that will send write send buffer area before, also judge send buffer area whether be about to full, if deletion writes the transmission buffer area with the described media data that has sent after sending media data the oldest in the buffer area again.
3. media data processing method as claimed in claim 1 is characterized in that:
In the steps A 3, encoding device is behind the repeat requests message that receives the media platform transmission, whether the media data of also judging number of frames in the repeat requests message and packet number correspondence is present in sends in the buffer area, do not send in the buffer area if the media data of described correspondence is not present in, then this repeat requests message is not responded.
4. media data processing method as claimed in claim 1 is characterized in that:
In the steps A 3, encoding device also is provided with the re-transmission mark to corresponding media data before carrying out described UDP message encapsulation.
5. a media data processing method is characterized in that, comprises the steps:
The media data that B1, media platform received code equipment send, and the media data that receives write the reception buffer area;
B2, media platform judge whether the media data that receives the oldest frame/frame group in the buffer area is complete, if, the media data of this frame/frame group is write video file, otherwise, send the repeat requests message to encoding device, comprise in the described repeat requests message lose the number of frames and the packet number of media data.
6. media data processing method as claimed in claim 5 is characterized in that, also comprises after the step B1:
Media platform judges whether receive buffer area reaches the default buffer memory upper limit, if directly the media data that will receive in the buffer area writes video file.
7. as claim 5 or 6 described media data processing methods, it is characterized in that:
After media platform will receive media data in the buffer area and write video file, also the media data that writes is deleted from receive buffer area.
8. media data processing method as claimed in claim 5 is characterized in that:
Among the step B1, media platform also is transmitted to decoding device with the described media data that receives behind the media data that receives the encoding device transmission.
9. media data processing method as claimed in claim 8 is characterized in that:
Among the step B1, media platform judges also whether the described media data that receives comprises the re-transmission mark, if this is not comprised the media data that retransmits mark and transmit behind the media data that receives the encoding device transmission.
10. an encoding device is characterized in that, comprise, and media data burst module, media data sending module, transmission buffer memory and repeat requests message receiver module, wherein:
Described media data burst module is used for media data is carried out burst, is the media data distribution number of frames and the packet number of burst;
Described media data sending module, being used for media data with burst is packaged into the UDP message and sends to media platform, and the media data that will send writes the transmission buffer memory, and according to number of frames in the repeat requests message and packet number, the corresponding media data of taking-up is packaged into the UDP message and sends to media platform from send buffer memory;
Described repeat requests message receiver module is used for lose comprising of receiving media platform the transmission number of frames of media data and the repeat requests message of packet number.
11. encoding device as claimed in claim 10 is characterized in that:
Described media data sending module the media data that will send write send buffer memory before, also judge send buffer memory whether be about to full, if deletion writes the transmission buffer memory with the described media data that has sent after sending media data the oldest in the buffer memory again.
12. encoding device as claimed in claim 10 is characterized in that:
Described media data sending module also is provided with the re-transmission mark to corresponding media data before carrying out described UDP message encapsulation.
13. a media platform is characterized in that, comprises, and media data receiver module, reception buffer memory, video file generation module and repeat requests message sending module, wherein:
Described media data receiver module is used for the media data that received code equipment sends, and the media data that receives is write the reception buffer memory;
Described video file generation module is used for when the media data that determine to receive the oldest frame of buffer memory/frame group is complete, and the media data of this frame/frame group is write video file;
Described repeat requests message sending module, be used for when the media data of determining the oldest frame of reception buffer memory/frame group is imperfect, send the repeat requests message to encoding device, comprise in the described repeat requests message lose the number of frames and the packet number of media data.
14. media platform as claimed in claim 13 is characterized in that:
Described video file generation module is used to also judge whether receive buffer memory reaches the default buffer memory upper limit, if directly the media data that will receive in the buffer memory writes video file.
15., it is characterized in that as claim 13 or 14 described media platforms:
After described video file generation module will receive media data in the buffer memory and write video file, also the media data that writes is deleted from receive buffer memory.
16. media platform as claimed in claim 13 is characterized in that, also comprises the media data forwarding module:
Described media data forwarding module is used for the media data that the media data receiver module receives is transmitted to decoding device.
17. media platform as claimed in claim 16 is characterized in that:
Described media data forwarding module judges also whether the described media data that receives comprises the re-transmission mark, if this is not comprised the media data that retransmits mark and transmit.
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