CN102547394A - Universal audio/video redirection method for cloud access devices under VDI (Video Desktop Infrastructure) environment - Google Patents
Universal audio/video redirection method for cloud access devices under VDI (Video Desktop Infrastructure) environment Download PDFInfo
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Abstract
The invention provides a universal audio/video redirection method for cloud access devices under the VDI environment, which includes the following steps: (1) a communication module, a virtual player and a GStreamer plug-in module are established in a client side; (2) a user carries out video-playing operation after remotely logging in a virtual desktop under the VDI environment on the client side, and a server side transmits control commands and multi-media stream data to the communication module by means of a communication protocol; (3) the communication module forwards the control commands and the multi-media stream data to the virtual player; (4) the virtual player loads the GStreamer plug-in module; (5) after the GStreamer plug-in module is loaded, the received data are forwarded to the GStreamer of the client side, and the GStreamer automatically creates a media-processing module to start playing audio and video. The invention realizes the smooth playing of audio and video when cloud access devices remotely access the virtual desktop under the VDI environment.
Description
[technical field]
The present invention relates to computer phoneme video technique field, relate in particular to the general audio frequency and video reorientation method of cloud access device under a kind of VDI environment.
[background technology]
VDI, English full name Virtual Desktop Infrastructure, i.e. virtual desktop architecture.It is not the desktop PC that all disposes operation Windows XP or a Vista to each user, but through at the server operation Windows of data center XP, carries out your desktop virtual; The user calculates agreement through the client from client device (client computer or home PC) and is connected with virtual desktop, and their desktop of user capture similarly is that desktop is installed in the traditional this locality of visit.At present; Very ripe under the VDI environment based on the windows platform multimedia redirecting technique of DirectShow (kit that Streaming Media is handled) framework; But DirectShow framework cross-platform ability is poor, lack versatility, makes this technology on other platforms, use and is restricted.Therefore, when needing a kind of general technology to make under the VDI environment cloud access device long-distance accesses virtual desktop of platforms such as Linux through client, ARM, can both carry out video to be redirected, to realize the smooth playing of audio frequency and video.According to the clock feedback of display filter, adjust the output video frame timestamp of receiving filtration device in real time, make video reach the effect of smooth and easy broadcast.
The realization of multimedia redirecting technique at present is confined to Windows server and window client, and relies on the DirectShow of Microsoft framework.But because DirectShow framework cross-platform ability is poor; Lack versatility; Original implementation method can't successful Application at the platform of other platforms such as VDI environment, and the user still exists multimedia application to experience the problem of difference during through Linux or ARM platform remote access virtual desktop.
A kind of " method for real-time video transmission of IP based network " is provided in the prior art; Its publication number is: CN101783941A; Open day be: the Chinese patent of 2010.07.21; The step of its realization is: transmitting terminal and receiving terminal use Transmission Control Protocol in transport layer, improve reliability of data transmission; Receiving terminal is that unit is stored in the reception buffering area with the picture frame, receives buffering area and organizes with circular pattern, is handling the available up-to-date the most out-of-date frame of frame covering under the slower situation, keeps the real-time of data; With directshow/gstreamer etc. as multimedia framework, according to the timestamp of the clock feedback real-time regulated receiving terminal frame of video of display end; This invention uses Transmission Control Protocol as transport layer protocol, effectively improves the reliability of video transmission, solves the packet loss and the out of order problem of Network Transmission, avoid decoder occur can not normal decoder phenomenon; With the frame is that unit leaves image information in the buffer circle in, efficiently solves time-delay and jitter problem; Use multimedia framework at receiving terminal,, adjust the output video frame timestamp of receiving filtration device in real time, make video reach the effect of smooth and easy broadcast according to the clock feedback of display filter.When but the technical scheme of this invention can not make the cloud access device long-distance accesses virtual desktop that under the VDI environment, passes through platforms such as Linux, ARM, realize the smooth playing of audio frequency and video.
[summary of the invention]
The technical problem that the present invention will solve; Be to provide the general audio frequency and video reorientation method of cloud access device under a kind of VDI environment, solved the problem of experiencing difference through the multimedia application that exists when the cloud access device long-distance accesses virtual desktop of this type of platform of VDI environment.
The present invention is achieved in that the general audio frequency and video reorientation method of cloud access device under a kind of VDI environment, comprises the steps:
Step 1, set up communication module, virtual player and GStreamer card module in the client of access device;
Said communication module: be responsible for carrying out communication, realize the mutual of multimedia streaming data and obtain control command, and be transmitted to server after receiving the broadcast state information of GStreamer multimedia application framework of client of said virtual player passback with server; Said control command comprises: play beginning, play F.F., play rewind down, play the order that stops; Said virtual player: be responsible for receiving control command and multimedia streaming data from said communication module; Control to the GStreamer card module; And through the media format conversion that the format converter of virtual player can be discerned Windows is the form that the GStreamer multimedia application framework of client can be discerned; The video playback window of realizing client represents at virtual desktop synchronously, and is responsible for the broadcast state information of the GStreamer multimedia application framework of the client of GStreamer card module passback is transmitted to communication module; Said GStreamer card module is: the plug-in unit of GStreamer multimedia application framework; Be responsible for receiving multimedia streaming data and control command after the format conversion from said virtual player; And be transmitted to the GStreamer of client; Automatically make up the multimedia processing module by GStreamer, realize the successful broadcast of multimedia streaming data, and be responsible for giving said virtual player the broadcast state information retransmission of GStreamer;
Step 3, said communication module are transmitted to said virtual player with said control command and multimedia streaming data;
Step 4, said virtual player load said GStreamer card module through control command; And with multimedia streaming data after the format converter of virtual player carries out format conversion and send said GStreamer card module to, and realize that the video playback window of client represents at virtual desktop synchronously;
After step 5, said GStreamer card module are loaded, receive the multimedia streaming data after the format conversion and be transmitted to the GStreamer of client, and create medium process module automatically, begin to carry out the broadcast of audio frequency and video by GStreamer;
The present invention has following advantage: the present invention sets up communication module, virtual player and GStreamer card module in the client of access device; Cooperation through these three modules; Broken away from the limitation of traditional DirectShow framework; Formed a kind of general audio frequency and video reorientation method; When making the cloud access device long-distance visit VDI environment virtual desktop down of platform such as Linux or the ARM of user through client carry out multimedia operations, can be smooth carry out the audio frequency and video broadcast, and promoted user experience.And the video window that plays back through GStreamer under general Linux or the ARM platform; Can show with a window under the normal condition; The present invention can let this video window show in the tram of the virtual desktop under the VDI environment, and ability real-time response user's operation.
[description of drawings]
The structured flowchart that Fig. 1 carries out communication for each module in the inventive method.
Fig. 2 is the inventive method schematic flow sheet.
[embodiment]
See also illustrated in figures 1 and 2ly, the general audio frequency and video reorientation method of cloud access device comprises the steps: under the VDI environment of the present invention
Step 1, set up communication module, virtual player and GStreamer card module (as shown in Figure 1) in the client of access device; Its communication module is carried out communication through communications protocol and server end; Communication module will be passed to virtual player from control command and multimedia streaming data that server end obtains; Load the GStreamer card module by player again; The GStreamer card module triggers GStreamer multimedia application framework and makes up the multimedia processing module automatically, realizes the successful broadcast of multimedia streaming data;
Said communication module: be responsible for carrying out communication, realize the mutual of multimedia streaming data and obtain control command, and be transmitted to server after receiving the broadcast state information of GStreamer multimedia application framework of client of said virtual player passback with server; Said control command comprises: play beginning, play F.F., play rewind down, play the order that stops; Said virtual player: be responsible for receiving control command and multimedia streaming data from said communication module; Control to the GStreamer card module; And the media format conversion that the format converter through virtual player (said format converter is for the media format conversion under the Windows being the transducer of the form that can discern of GStreamer multimedia application framework) can be discerned Windows is the form that the GStreamer multimedia application framework of client can be discerned; The video playback window of realizing client represents at virtual desktop synchronously, and is responsible for the broadcast state information of the GStreamer multimedia application framework of the client of GStreamer card module passback is transmitted to communication module; Said GStreamer card module is: the plug-in unit of GStreamer multimedia application framework; Be responsible for receiving multimedia streaming data and control command after the format conversion from said virtual player; And be transmitted to the GStreamer multimedia application framework of client; Automatically make up the multimedia processing module by GStreamer multimedia application framework; Realize successful broadcasts of multimedia streaming data, and be responsible for the broadcast state information of GStreamer multimedia application framework (broadcast state information: as beginning normal play information,, can't broadcast information, the whole affirmation information after putting the notification message that finishes and frame data and finishing of spreading of Gstreamer announcement server etc.) return to said virtual player;
Step 3, said communication module are transmitted to said virtual player with said control command and multimedia streaming data;
Step 4, said virtual player load said GStreamer card module through control command; And with multimedia streaming data after the format converter of virtual player carries out format conversion and send said GStreamer card module to, and realize that the video playback window of client represents at virtual desktop synchronously;
After step 5, said GStreamer card module are loaded; Receive the multimedia streaming data after the format conversion and be transmitted to the GStreamer multimedia application framework of client; And create medium process module automatically by GStreamer multimedia application framework, begin to carry out the broadcast of audio frequency and video;
Wherein said step 5 is specially: in said GStreamer card module, create Pad earlier; And add the Pipe pipe communication mechanism and communicate with said virtual player, said Pad is that the multimedia streaming data after the format conversion that the GStreamer card module is received is transferred to GStreamer multimedia application framework; When said virtual player began to send multimedia streaming data to said GStreamer card module, it at first write in the Pipe pipeline as the uniquely identified character string, and the GStreamer card module reads and detect the character string of said write; If the character string of said write does not change; Then (said package types is that the plug-in unit of GStreamer multimedia application framework is when registering in GStreamer multimedia application framework to the package types of the GStreamer multimedia application framework of Spoke-to-Client end; Can generate the package types of corresponding function) mate successfully, the GStreamer card module is successfully loaded; Otherwise, the package types coupling failure of GStreamer multimedia application framework, the GStreamer card module can not successfully be loaded, and does not operate; After this GStreamer card module is loaded, the multimedia streaming data after the format conversion is sent among the Pad (Pad is the technical term in the GStreamer multimedia application framework, and Chinese is the meaning of " liner ", and it is used for carrying out the transmission of flow data); Simultaneously, control the operation of the GStreamer of client through said control command; Behind the multimedia streaming data of said GStreamer after receiving the conversion of control command and form, will create the Streaming Media processing module automatically, begin to carry out the broadcast of audio frequency and video.
Here be noted that: the video window that plays back through GStreamer under general Linux or the ARM platform; Can show with a window under the normal condition; The present invention can let this video window show in the tram of the virtual desktop under the VDI environment, and ability real-time response user's operation.The video playback window of its client in the concrete mode that virtual desktop represents synchronously is: at first; Create one first window at server end; First window is set to the video player subwindow of server end, makes the state of first window controlled by the video player of server end; Simultaneously, will monitor the state of first window in real time at server end, said state comprises size and window visibility region; Secondly; Create one second window in client; Utilize the mechanism of the GStreamer multimedia application framework of client, the element ximagesink or the xvimagesink (said element ximagesink or xvimagesink are the plug-in unit that carries in the GStreamer multimedia application framework) that are used in the video demonstration are presented at video pictures on second window; At last; Second window is set to the subwindow of the virtual desktop window under the VDI environment; When the user moves second window or during full frame operation at virtual desktop; The state information of the said server end that monitors in real time first window is sent to client, and client is according to state information, corresponding adjustment client second position of window and size; Said second window is said client video playback window, thereby realizes that client video playback window represents at virtual desktop synchronously.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (4)
1. the general audio frequency and video reorientation method of cloud access device under the VDI environment is characterized in that, comprises the steps:
Step 1, set up communication module, virtual player and GStreamer card module in the client of access device;
Said communication module: be responsible for carrying out communication, realize the mutual of multimedia streaming data and obtain control command, and be transmitted to server after receiving the broadcast state information of GStreamer multimedia application framework of client of said virtual player passback with server; Said control command comprises: play beginning, play F.F., play rewind down, play the order that stops; Said virtual player: be responsible for receiving control command and multimedia streaming data from said communication module; Control to the GStreamer card module; And through the media format conversion that the format converter of virtual player can be discerned Windows is the form that the GStreamer multimedia application framework of client can be discerned; The video playback window of realizing client represents at virtual desktop synchronously, and is responsible for the broadcast state information of the GStreamer multimedia application framework of the client of GStreamer card module passback is transmitted to communication module; Said GStreamer card module is: the plug-in unit of GStreamer multimedia application framework; Be responsible for receiving multimedia streaming data and control command after the format conversion from said virtual player; And be transmitted to the GStreamer of client; Automatically make up the multimedia processing module by GStreamer, realize the successful broadcast of multimedia streaming data, and be responsible for giving said virtual player the broadcast state information retransmission of GStreamer;
Step 2, user be through client Telnet VDI environment virtual desktop down, and carry out video playback when operating, and server end is transferred to control command and multimedia streaming data through the TCP host-host protocol communication module of client;
Step 3, said communication module are transmitted to said virtual player with said control command and multimedia streaming data;
Step 4, said virtual player load said GStreamer card module through control command; And with multimedia streaming data after the format converter of virtual player carries out format conversion and send said GStreamer card module to, and realize that the video playback window of client represents at virtual desktop synchronously;
After step 5, said GStreamer card module are loaded, receive the multimedia streaming data after the format conversion and be transmitted to the GStreamer of client, and create medium process module automatically, begin to carry out the broadcast of audio frequency and video by GStreamer.
2. the general audio frequency and video reorientation method of cloud access device is characterized in that under the VDI environment according to claim 1, after step 5, also further comprises:
Step 6, give said virtual player with the broadcast state information retransmission of the GStreamer of client, said virtual player is also given the broadcast state feedback information user of client.
3. the general audio frequency and video reorientation method of cloud access device under the VDI environment according to claim 1; It is characterized in that: said step 5 is specially: in said GStreamer card module, create Pad earlier; And add the Pipe pipe communication mechanism and communicate with said virtual player, said Pad is that the multimedia streaming data after the format conversion that the GStreamer card module is received is transferred to GStreamer multimedia application framework; When said virtual player began to send multimedia streaming data to said GStreamer card module, it at first write in the Pipe pipeline as the uniquely identified character string, and the GStreamer card module reads and detect the character string of said write; If the character string of said write does not change, then the package types of the GStreamer multimedia application framework of Spoke-to-Client end is mated successfully, and the GStreamer card module is successfully loaded; Otherwise, the package types coupling failure of GStreamer multimedia application framework, the GStreamer card module can not successfully be loaded, and does not operate; After this GStreamer card module is loaded, the multimedia streaming data after the format conversion is sent among the Pad; Simultaneously, control the operation of the GStreamer of client through said control command; Behind the multimedia streaming data of said GStreamer after receiving the conversion of control command and form, will create the Streaming Media processing module automatically, begin to carry out the broadcast of audio frequency and video.
4. the general audio frequency and video reorientation method of cloud access device under the VDI environment according to claim 1; It is characterized in that: the video playback window of realizing client in the said step 4 represents synchronously at virtual desktop and is specially: at first; Create one first window at server end; First window is set to the video player subwindow of server end, makes the state of first window controlled by the video player of server end; Simultaneously, will monitor the state of first window in real time at server end, said state comprises size and window visibility region; Secondly, create one second window in client, utilize the mechanism of the GStreamer multimedia application framework of client, the element ximagesink or the xvimagesink that are used in the video demonstration are presented at video pictures on second window; At last; Second window is set to the subwindow of the virtual desktop window under the VDI environment; When the user moves second window or during full frame operation at virtual desktop; The state information of the said server end that monitors in real time first window is sent to client, and client is according to state information, corresponding adjustment client second position of window and size; Said second window is said client video playback window, thereby realizes that client video playback window represents at virtual desktop synchronously.
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