CN102045312B - Self-adaptative transcoding method and system - Google Patents
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Abstract
The invention provides a self-adaptative transcoding method and system. The self-adaptative transcoding method comprises the following steps of: when the format of a local multimedia file is not supported by a media player, triggering the media server; determining whether a transcoding module supports transcoding by the media server, if so, notifying the media player to upload the multimedia file; when the media player uploads the multimedia file to the media server, starting the multimedia file read and uploaded by the transcoding module so that the transcoding module transcodes the multimedia file by a predetermined transcoding strategy; receiving the transcoded data from the transcoding module by the media server, and sending the received transcoded data to the media player to play; detecting network performance parameters in the playing process of the media player and performance parameters of the media player by the media server, and adjusting the trancoding strategy in real timeaccording to the performance parameters.
Description
Technical field
The present invention relates to a kind of self adaptation code-transferring method and system, more particularly, relate to a kind of automatic adaptive code-transferring method and system of the media player end based on digital home network.
Background technology
Digital home network extends to family by home gateway with public network functions and application, and connect various information terminals (such as household electrical appliance, PC etc.) with cable network or wireless network mode, the functions such as voice, data, multimedia, control and management are provided, and the information that reaches is within the family between section's terminal and with the abundant circulation of external public network with share.Birth from digital home's concept in 1994, the up till now formal startup in digital home market is from the release of " Venus " plan, to the establishment of UPnP forum, DLNA digital home tissue, gone through development in more than ten years, Digital Life has stepped into real period of expansion.Progressively clear along with digital home network dream, the problem of standard is following.
In June, 2003,17 consumer electronics industry giants such as Intel, Philip, IBM, Hewlett-Packard, Microsoft and Fujitsu set up " DHWG " (DHWG:Digital Home WorkGroup), common research and development are on open industry standard basis, set up a platform that possesses the collaborative work ability, can carry out the digital home appliance that content is shared by wired or wireless internet so that each manufacturer develops.IGRS (IGRS) standard becomes China's first " 3C works in coordination with the industrial technology standard " in the formal granted national commendatory trade standards that becomes on June 29th, 2005.On the whole, the scope of DLNA only limits to household internal, its objective is the intelligent link that realizes household electrical appliances, computer, communication equipment.The main distinction of IGRS and DLNA is: the IGRS standard not only realizes the intelligence interconnection of equipment room, the more important thing is resource-sharing and the cooperation with service of realization equipment; On working range, the scope of IGRS standard is not limited only to family, comprises the synergistic application of the upper related resource of application and society in the enterprise.
For above standard, come minute can be divided into three by level: the equipment detection be connected, management and media formats and the transmission of media content.The transcoding function belongs to " media formats and transmission " this category.Realized by gateway among the IGRS, realized by MIU (media interoperability unit) among the DLNA.Gateway and MIU can realize real-time transcoding, and can automatically adjust Transcoding Scheme according to configuration information.Yet, no matter IGRS or DLNA, realization all to be Media Stream be transferred to transcoding in the media player process by media server, the acquiescence multimedia file leaves in the media server.Therefore, existing Transcoding Scheme do not consider when multimedia file is present in the media player end, and media player need to carry out the problem that transcoding could be play to multimedia file.In addition, prior art only provides several fixing Transcoding Scheme, and the Transcoding Scheme of not adjusting in real time according to performance and the network condition of media player.
Summary of the invention
To be partly articulated in the following description the other aspect of the present invention and/or advantage, by describing, it can become clearer, perhaps can understand by implementing the present invention.
According to an aspect of the present invention, provide a kind of self adaptation code-transferring method, may further comprise the steps: when media player is not supported the form of local multimedia file, trigger media server; Media server determines whether the transcoding module supports transcoding, and when definite transcoding module was supported transcoding, the notice media player was uploaded described multimedia file; When media player uploaded to media server with described multimedia file, media server started the transcoding module and reads the multimedia file of uploading, thereby the transcoding module is carried out transcoding with predetermined transcoding strategy to multimedia file; Media server receives data behind the transcoding from the transcoding module, and the data behind the transcoding that receives are sent in the media player to play; Media server is surveyed the performance parameter of network performance parameter in the media renderer plays process and player itself, and according to described performance parameter the transcoding strategy is adjusted in real time.
According to a further aspect of the invention, provide a kind of self adaptation trans-coding system, comprising: media player, trigger media server, and upload described multimedia file according to the notice of media server when not supporting the form of local multimedia file; Media server determines whether the transcoding module supports transcoding, and when definite transcoding module was supported transcoding, notice media player end was uploaded described multimedia file; The transcoding module, when media player uploads to media server with described multimedia file, read the multimedia file of uploading, with predetermined transcoding strategy multimedia file is carried out transcoding, and the data behind the transcoding are sent to media server, wherein, media player receives data behind the transcoding to play from media server, media server is surveyed the performance parameter of network performance parameter in the playing process of media player and player itself, and according to described performance parameter the transcoding strategy is adjusted in real time.
Description of drawings
By the description of embodiment being carried out below in conjunction with accompanying drawing, these and/or other aspect of the present invention and advantage will become clear and be easier to and understand, wherein:
Fig. 1 shows the block diagram according to the self adaptation trans-coding system of the embodiment of the invention;
Fig. 2 shows the flow chart according to the self adaptation code-transferring method of the embodiment of the invention.
Embodiment
Now the embodiment of the invention is described in detail, its example shown in the accompanying drawings, wherein, identical label represents same parts all the time.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Fig. 1 shows the block diagram according to the self adaptation trans-coding system of the embodiment of the invention.With reference to Fig. 1, described self adaptation trans-coding system comprises media server, media player and transcoding module, and wherein, the transcoding module can be arranged in the media server, perhaps divides with media server to be arranged.Include again a plurality of functional modules in media server, media player and transcoding inside modules, with the collaborative specific function of finishing, such as upload, transcoding, download etc.
Specifically, media server comprises: equipment detection and link block, control directory services module, upload control module, streaming media service module, XML text resolution module, transcoding dynamic-configuration module, network and player capabilities detecting module, FIFO (first in first out) control module.Wherein, equipment detection and link block, control directory services module, to upload control module, streaming media service module and XML text resolution module be defined in the digital home network agreement.
Equipment detection and link block are surveyed the connection status of the device in media server and the home network, and the physical connection of the device in realization and the home network.The control directory services module provides the directory service of the content (video, audio frequency, picture etc.) that can play to media player.XML text resolution module is used for resolving the configuration file of transcoder end and media player end, and the information of the configuration file after will resolving offers transcoding dynamic-configuration module.The function that above-mentioned three modules realize is well known to a person skilled in the art, has therefore omitted above-mentioned three modules in Fig. 1.
Upload the multimedia file data that control module control is uploaded by media player, be used for realizing that the control of speed is with the transcoding speed of coupling transcoding module.
The FIFO control module provides the mechanism of a kind of first in first out of data flow, thereby conveniently stream medium data is carried out flow control.The FIFO control module comprises two FIFO files, a FIFO input file that is used for storing the unprocessed form of receiving from the media player termination (namely, the multimedia file data that media player is uploaded), another reads the FIFO output file from transcoder, that is, via the multi-medium data behind the transcoder transcoding.According to the embodiment of the invention, a capacity limit can be set the FIFO control module so that the control flow.For example, when the FIFO input file reaches capacity limit, upload the error message request media player that control module sends according to the FIFO control module and stop to upload the multimedia file data.When the FIFO input file is idle after the FIFO input file is read by the transcoding module, uploads the idle message request media player that control module sends according to the FIFO control module and continue to upload the multimedia file data.
The streaming media service module receives FIFO output file (that is, the multi-medium data behind the transcoding) from the FIFO control module, and with the Multimedia Data Transmission behind the transcoding to media player.
The performance parameter of network and player capabilities detecting module real-time detection network performance parameter and player itself.Network performance parameter comprises the rate etc. of sending to of current bandwidth, IP bag.The performance parameter of player itself comprises current C PU occupancy, current frame rate etc.The performance parameter of network performance parameter and player itself at set intervals (for example, every 5 seconds) will be upgraded once.The performance parameter of network and player capabilities detecting module Real-time Obtaining network and player itself, and these performance parameters are transferred to transcoding dynamic-configuration module.
Transcoding dynamic-configuration module can obtain following information: the performance parameter of network and player itself, transcoder function description document and media player end configuration file.Wherein, media player end configuration file comprises player hardware functional description file and player capabilities description document, in connection with media player this is described after a while.Transcoding dynamic-configuration module utilizes transcoder function description document and media player end configuration file to come the transcoding strategy of general arrangement transcoding module, and utilize the performance parameter of network and player itself to adjust in real time the transcoding strategy, so that transcoding and broadcast performance reach best.
Media player comprises transmission module, media management module, media play module, player hardware functional description file and player capabilities description document.Wherein, upper transmission module, media management module, media play module are defined in the digital home network agreement, and player hardware functional description file and player capabilities description document form above-mentioned media player end configuration file.Media player end configuration file can be stored in the local storage of media player.In addition, the multimedia file that places media player has been shown among Fig. 1.
The media play module is used for the play multimedia file.Specifically, the media play module is the multimedia player of a multiple input sources, supports the broadcast of audio frequency, video, picture.Under normal circumstances, if when the local hardware decoder of media player can be decoded to multimedia file, playing module was play-overed multimedia file; If the local hardware decoder is not supported multimedia file decoding and simultaneously transcoding module support transcoding, then the media play module turns to data source the input of media server end, the data that streaming media service module in the receiving media server provides (namely, multimedia file behind the transcoding), to realize the real time flow medium broadcast.
The upper transmission module of media management module control and media play module, and monitoring player capabilities information.The form of the multimedia file that media management module monitoring media playing module is play, when discovery has the form of multimedia file not supported by the media play module, transmission module in the triggering.When upper transmission module is triggered by media management module, multimedia file is uploaded to the control module of uploading in the media server.Upper transmission module can be uploaded multimedia file according to http protocol under the control of media management module.In addition, media management module also can send to media player end configuration file the transcoding dynamic-configuration module in the media server.On the other hand, during the transcoding module was carried out transcoding, media management module sent to network and player capabilities detecting module according to the request of the network in the media server and player capabilities detecting module in real time with player capabilities information.
Player hardware functional description file comprises two aspects, is the functional description of hardware decoder on the one hand, is the hardware description of player on the other hand, such as screen size, resolution, memory size, channel number etc.The player capabilities description document comprises the ability of ability, hardware decoder of processor and the capacity etc. of distributing to the display memory of decoder.
The transcoding module comprises transcoder and the transcoder function description document that any third party provides.Modal transcoder is exactly ffmpeg.The transcoder function description document has defined the transcoding function that transcoder is supported, for example, is the transcoding function of mpeg4 file with the wmv file conversion.The transcoding module can be an independent process in running, also can be hardware transcoding device independently.
Specifically, the transcoding module can be third-party transcoding software library, also can be the hardware device on the network.If the transcoding module is the hardware device on the network, then transcoding module and media server intermediate demand arrange network communication module with realize between the two data and the transmission of control information.The transcoding module itself is dynamically configurable, relates to the conversion of code check, the conversion of output resolution ratio, the conversion of color space etc.
According to the embodiment of the invention, the transcoding dynamic-configuration module in the media server is at first extracted the transcoder function description document, determine can transcoding format range, set up the transcoding rule base.Then, transcoding dynamic-configuration module is extracted media player end configuration file, and whether matching inquiry transcoding module is supported unprocessed form is transformed into the form that player is supported in order, and selects by nearest matching principle.Because the unsteadiness of network and player capabilities, so the information that transcoding dynamic-configuration module can utilize network and player capabilities detecting module to provide adjusts the transcoding action in real time, realizes optimum result of broadcast to reach in player end.
The self adaptation code-transferring method of being carried out by described self adaptation trans-coding system is described referring to Fig. 2.
Fig. 2 shows the flow chart according to the self adaptation code-transferring method of the embodiment of the invention.Suppose that media player was connected with media server and was set up connection this moment.
With reference to Fig. 2, in step S201, when the media play module in the media player when playing local multimedia file, if media management module is found the form of this multimedia file and is not supported by the media play module, the media player end configuration file in the read local memory then, and the media player end configuration file that reads sent to the media server end.Simultaneously, media management module can trigger the transcoding dynamic-configuration module in the media server.
The example of the player hardware functional description file in the media player end configuration file is as follows by the XML textual description:
<profile?name＝”supported?file?format”>
<mimetype>audio/x-wav</mimetype>
<mimetype>audio/midi</mimetype>
<mimetype>audio/mp3</mimetype>
<mimetype>video/mp4</mimetype>
<mimetype>video/3gp</mimetype>
<mimetype>video/x-mp4</mimetype>
<mimetype>image/jpeg</mimetype>
<mimetype>image/gif</mimetype>
<mimetype>image/png</mimetype>
</profile>
<profile?name＝”player?hardware?infomation”>
<pixel>720x576</pixel>
<memory>128</memory>
<channel>2</channel>
</profile>
According to player hardware functional description file as implied above, can determine audio frequency, video, picture format that media player is supported, and the hardware information of media player, such as resolution, memory size, channel number.
In step S202, after transcoding dynamic-configuration module in the media server receives media player end configuration file, call XML text resolution module (for example resolves to metadata with media player end configuration file, audio/x-wav, the video/mp4 that defines in the player hardware functional description file, image/png etc.), resolve simultaneously the transcoder function description document, utilize the information after resolving to determine whether the transcoding module supports transcoding.Here, transcoding dynamic-configuration module is at first determined the transcoding type of supporting that defines in the transcoder function description document, then determine whether the format conversion that the current media player can not be supported any one listed file in the player end configuration file.Support transcoding if determine the transcoding module, then transcoding dynamic-configuration module notice media player end begins to upload multimedia file, simultaneously the data source of media player end is redirected to the streaming media service of media server from local multimedia file.
Transcoder function description document text example is as follows by the XML textual description:
<profile?name＝”transcode?function”>
<transcode?from＝”audio/x-ms-wma”to＝”audio/mp3”/>
<transcode?from＝”video/x-ms-wmv”to＝”video/mp4”/>
<transcode?from＝”image/tif”to＝”image/jpeg”/>
<codec?command＝”ffmpeg”arguments＝”-d％format-f％out-f％in”>
</profile>
According to transcoder function description document as implied above, defined the transcoding parameter of a series of transcoding rule and acquiescence.Here, the transcoding rule refers to from a kind of coded format and is transformed into another kind of coded format, and the transcoding parameter refers to and will be transmitted to the parameter of transcoding module, is used for adjusting the running status of transcoding module.Specifically, the transcoding parameter can comprise resolution, frame per second, video bitrate, audio bit rate etc.According to the embodiment of the invention, its operational factor is dynamically adjusted in the support of transcoding module.
In step S203, the upper transmission module in the media player arrives media server with the multimedia file transfer of data.Specifically, when transcoding dynamic-configuration module determines that the transcoding module is supported transcoding, upload control module and send the HTTP-Get request to media player, the media player that receives this request arrives media server by the upper transmission module of media management module control with the multimedia file transfer of data, and the control module of uploading of media server is sent to the multimedia file data that receive in the FIFO input file of FIFO control module.
In step S204, the transcoding dynamic-configuration module in the media server starts the transcoding module, thereby the transcoding module reads the multimedia file of uploading, and with predetermined transcoding strategy the multimedia file data is carried out real-time decoding.Here, the transcoding module can be with the pattern of single process or with the pattern of independent hardware module, by the transcoder function description document of resolving and media player end configuration file initialization (that is, the transcoding strategy of configuration transcoding module).
In step S205, after the transcoding module is carried out real-time transcoding, the data behind the transcoding are sent in the FIFO output file of media server.
In step S206, the streaming media service module in the media server reads the data in the FIFO output file, and then the form with http protocol sends to the data that read in the media player, to play.
In step S207, the data that the playing module receiving stream media service module transmission in the media player comes are called the local hardware decoder data are decoded, and show the data of decoding at display screen.
In step S208, network in the media server and player capabilities detecting module are with fixed frequency (for example, 5 seconds/time) survey the performance parameter of network in the playing process of media player and player itself, and the parameter that detects is transferred to transcoding dynamic-configuration module, thereby transcoding dynamic-configuration module can be adjusted in real time according to described performance parameter the transcoding strategy of transcoding module.That is, transcoding dynamic-configuration module can be adjusted the transcoding parameter in real time according to described performance parameter, to realize dynamic-configuration transcoding module.
Although in the above description, the multimedia file data transfer the invention is not restricted to this based on http protocol, also can come the transmitting multimedia file data based on File Transfer Protocol.
Existing capability according to self adaptation code-transferring method of the present invention and system utilize digital home network to provide has the advantages such as cost is low, flexibility is large, configurable.In addition, according to self adaptation code-transferring method of the present invention and system for the digital home network environment under digital device the concept of media formats independence is provided, thereby only need under whole digital home network environment, provide a powerful transcoding server, just can solve the problem a little less than a plurality of digital device decoding capabilities.
Although shown with reference to embodiments of the invention and described the present invention, but those skilled in the art should understand that, in the situation that does not break away from the spirit and scope of the present invention that limited by claim and equivalent thereof, can carry out in form and details various changes.
Claims (17)
1. self adaptation code-transferring method may further comprise the steps:
When media player is not supported the form of local multimedia file, trigger media server;
Media server determines whether the transcoding module supports transcoding, and when definite transcoding module was supported transcoding, the notice media player was uploaded described multimedia file;
When media player uploaded to media server with described multimedia file, media server started the transcoding module and reads the multimedia file of uploading, thereby the transcoding module is carried out transcoding with predetermined transcoding strategy to multimedia file;
Media server receives data behind the transcoding from the transcoding module, and the data behind the transcoding that receives are sent in the media player to play;
Media server is surveyed the performance parameter of network performance parameter in the media renderer plays process and player itself, and according to the performance parameter of described network performance parameter and player itself the transcoding strategy is adjusted in real time.
2. self adaptation code-transferring method according to claim 1, wherein, trigger the media server step and comprise:
When media player is not supported the form of local multimedia file, the media player end configuration file in the read local memory;
The media player end configuration file that reads is sent to media server;
Trigger media server.
3. self adaptation code-transferring method according to claim 2, wherein, media server resolves to determine whether the transcoding module supports transcoding to the transcoder function description document that the media player end configuration file that receives and transcoding module provide.
4. self adaptation code-transferring method according to claim 2, wherein, media server is determined described predetermined transcoding strategy according to media player end configuration file and the transcoder function description document of resolving.
5. self adaptation code-transferring method according to claim 1, wherein, media server is surveyed the performance parameter of network performance parameter in the media renderer plays process and player itself with fixed frequency.
6. self adaptation code-transferring method according to claim 2, wherein, media player end configuration file comprises player hardware functional description file and player capabilities description document, described player hardware functional description file comprises the functional description of hardware decoder and the hardware description of player, and described player capabilities description document comprises the ability of processor, the ability of hardware decoder and the capacity of distributing to the display memory of decoder.
7. self adaptation code-transferring method according to claim 3, wherein, the transcoding function that transcoder function description document definition transcoding module is supported.
8. self adaptation code-transferring method according to claim 1, wherein, network performance parameter comprises the rate of sending to of current bandwidth, IP bag, the performance parameter of player itself comprises current C PU occupancy, current frame rate.
9. self adaptation trans-coding system comprises:
Media player triggers media server when not supporting the form of local multimedia file, and uploads described multimedia file according to the notice of media server;
Media server determines whether the transcoding module supports transcoding, and when definite transcoding module was supported transcoding, notice media player end was uploaded described multimedia file;
The transcoding module when media player uploads to media server with described multimedia file, reads the multimedia file of uploading, and with predetermined transcoding strategy multimedia file is carried out transcoding, and the data behind the transcoding are sent to media server,
Wherein, media player receives data behind the transcoding to play from media server, media server is surveyed the performance parameter of network performance parameter in the playing process of media player and player itself, and according to the performance parameter of described network performance parameter and player itself the transcoding strategy is adjusted in real time.
10. self adaptation trans-coding system according to claim 9, wherein, media player comprises transmission module, media management module, media play module and media player end configuration file,
Wherein, when the media play module was not supported the form of local multimedia file, media management module sent to media server with media player end configuration file, and uploaded described multimedia file according to the upper transmission module of notice control of media server.
11. self adaptation trans-coding system according to claim 9, wherein, media server comprises:
Equipment is surveyed and link block, surveys the connection status of media server and media player, and the physical connection of realization and media player;
The control directory services module provides the directory service of the content of broadcast to media player;
Upload control module, the multimedia file that control is uploaded by media player;
XML text resolution module, the transcoder function description document that the media player end configuration file that the parsing media server provides and transcoding module provide;
Transcoding dynamic-configuration module is determined described predetermined transcoding strategy according to media player end configuration file and the transcoder function description document of resolving;
The first in first out control module is used for multimedia file that the medium player uploads and via the data behind the transcoding module transcoding;
The streaming media service module, the data behind the reception transcoding also send it to media player;
Network and player capabilities detecting module, survey the performance parameter of network performance parameter in the playing process of media player and player itself, and the performance parameter of described network performance parameter and player itself is offered transcoding dynamic-configuration module so that the transcoding strategy is adjusted in real time.
12. self adaptation trans-coding system according to claim 9, wherein, the transcoding module comprises: transcoder is used for carrying out the transcoding function; The transcoder function description document, the transcoding function that the definition transcoder is supported.
13. self adaptation trans-coding system according to claim 11, wherein, network and player capabilities detecting module are with the performance parameter of network performance parameter and player itself in the fixed frequency detection media renderer plays process.
14. according to claim 10 or 11 described self adaptation trans-coding systems, wherein, media player end configuration file comprises player hardware functional description file and player capabilities description document, described player hardware functional description file comprises the functional description of hardware decoder and the hardware description of player, and described player capabilities description document comprises the ability of processor, the ability of hardware decoder and the capacity of distributing to the display memory of decoder.
15. self adaptation trans-coding system according to claim 9, wherein, network performance parameter comprises the rate of sending to of current bandwidth, IP bag, and the performance parameter of player itself comprises current C PU occupancy, current frame rate.
16. self adaptation trans-coding system according to claim 9, wherein, the transcoding module is arranged in the media server.
17. self adaptation trans-coding system according to claim 11, wherein, the first in first out control module is provided with the capacity limit of control flow,
Wherein, when the multimedia file of uploading reaches capacity limit, upload the error message request media player that control module sends according to the first in first out control module and stop to upload multimedia file, when the first in first out control module is idle after the multimedia file of uploading is read by the transcoding module, uploads the idle message request media player that control module sends according to the first in first out control module and continue to upload multimedia file.
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