CN1598767A - Method and system for synchronous playing audio-video at BREW platform - Google Patents
Method and system for synchronous playing audio-video at BREW platform Download PDFInfo
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Abstract
The invention relates to an approach of synchronous playing audio and video in BREW platform. It includes: setting a data receiving module to connect with network; setting triggering incident of data receiving to receive data from network and storage into data zone; setting an audio playing module to check data in audio data zone, playing audio data and update time stamp of audio playing by using periodic incident to trigger in process of playing audio data; setting a video playing module to check data in video data zone, decode video data, convert video data format to local format, adjust video and audio synchronization, display video data, and what's more, to adjust interval among video frames to realize synchronistically play audio and video data and guarantee its fluency and timely responsibility.
Description
Technical field
The present invention relates to the multi-media communication technical field, relate in particular to the method that on the binary runtime environment for wireless mobile phone, realizes the synchronously playing audio frequency video.
Background technology
BREW is the abbreviation of Binary Runtime Environment for Wireless, is the general-purpose platform that provides for wireless data application program development and execution.
The BREW runtime environment is thin software interface layer, is positioned on the wireless device between chip system software and application program, makes the final user can the wireless downloading program and move enabling on the equipment of BREW.BREW has higher flash memory and RAM service efficiency (that is, its shared flash memory is less), and when application program is moved dynamic assignment RAM.BREW provides efficient, low-cost, as can to expand and a be familiar with application execution environment (AEE), one highly integrated chipset function, system software of cover and the plug-in unit that is used to realize senior Internet function and multimedia function, the application program that exploitation can any actual handheld device of seamless implantation emphatically.The function environment that BREW provides is just as the operating system on the PC, can use by application program or recreation that the service provider downloads specified type.Simultaneously, by the BREW interface function, supplier may be provided in cover complete information, commercial affairs, amusement function.BREW is mainly used in moving communicating field, the free PC operating system of the similar opening of BREW, and manufacturer can design every application on this platform.
Because the BREW environment is not supported the singularity of multithreading and platform own, the mode that realizes multimedia audio video data synchronous playing under windows or Linux environment can't realize in the BREW environment, in order to realize multimedia synchronous playing, must use incident technology.
Summary of the invention
Technical matters to be solved by this invention be to provide a kind of on binary runtime environment for wireless the method and system of synchronously playing audio frequency video, be implemented in and realize the synchronously playing audio frequency video data in the BREW environment, and guarantee its fluency and timely response.
To achieve these goals, the invention provides a kind of method that on binary runtime environment for wireless, realizes the synchronously playing audio frequency video, comprising:
One data reception module is set, is used for connecting, the Data Receiving trigger event is set, receive the data of automatic network, and store the data field into network;
One audio playing module is set, is used to check the data of audio data region, playing audio-fequency data, and in the process of playing audio-fequency data, utilize recurrent event to trigger the timestamp that regularly upgrades voice playing;
One video playback module is set, be used to check the video data district data, decode video data, with the format conversion of video data be native format, regulate video and audio frequency synchronously, display video data.
The described setting in the audio playing module, when checking audio zone, when finding that voice data is play inadequately, system forwards to and waits for triggering.
The mode that described wait triggers is that Event triggered or timer trigger.
Incident in the described Event triggered is the Data Receiving trigger event in the data stream receiver module.
The step that described timer triggers comprises:
The audio frequency waiting timer is set;
The audio frequency waiting timer time arrives.
The step of described voice playing comprises:
Whether step 61, inspection voice data are enough play; When voice data is enough, just forward step 63 to;
Step 61, the condition that wait for to trigger is set, when trigger condition satisfies, returns step 61;
Step 63, playing audio-fequency data, and when playing audio-fequency data, recurrent event triggers upgrades the voice playing timestamp.
Step 64, voice playing are finished and are returned step 61.
Described voice playing step comprises that also in the recurrent event triggering that begins to be provided with the voice playing time of voice playing part, in the process of playing audio-fequency data, recurrent event triggers the timestamp that regularly upgrades voice playing.
Described video playback step comprises:
Whether step 801, inspection receive frame complete video data; When receiving frame complete video data, forward step 803 to;
Step 802, the condition that wait for to trigger is set, when condition satisfies, forwards step 801 to;
The video data that step 803, decoding receive;
Step 804, the complete BITMAP form bitmap of formation;
Step 805, bitmap-converted become the form of mobile phone this locality;
The difference of step 806, comparison video time stamp and audio time stamp is if difference in allowed band, forwards step 810 to;
In advance whether step 807, comparison video time stamp audio time stamp, if forward step 809 to;
Step 808, return step 801;
Step 809, the leading timer of video is set, timer time is to forwarding step 806 to;
Step 810, show this frame data, return step 801.
In scope, can also further regulate the frame period of video data in the difference of step 806 video time stamp and audio time stamp.
The step of the frame period of described adjusting video data comprises:
Step 101, relatively accurate reproduction time of video and current time, ask when video is accurately play after, execution in step 102, the accurate reproduction time of video jumps to step 104 preceding;
Step 102, the difference timer is set;
Step 103, difference timer time arrive;
Step 104, frame period are regulated and are finished.
Including synchronously of described adjusting video and audio frequency:
The difference of video time stamp and audio time stamp within the range of permission, adjusting is finished;
The difference of video time stamp and audio time stamp is regulated the frame period of video data within the range of permission, and adjusting is finished;
The difference of video time stamp and audio time stamp not within the range of permission, and the leading audio time stamp of video time stamp is provided with the leading timer of video, timer time arrives, adjusting is finished;
The difference of video time stamp and audio time stamp not within the range of permission, and video time stamp falls behind audio time stamp, adjusting is finished;
After described step 803, described step 804, step 805, step 806, can increase timer in short-term, timer time in short-term to after carry out next step again.
The mode that the described wait of step 802 triggers is that Event triggered or timer trigger.
The invention also discloses a kind of system that realizes the synchronously playing audio frequency video on binary runtime environment for wireless, described system comprises data reception module, audio playing module and video playback module; Wherein:
Data reception module is used for realizing connecting with network, and the Data Receiving trigger event is set, and receives the data of automatic network, and stores the data field into;
Audio playing module is used to realize checking the data of audio data region, and playing audio-fequency data in the process of playing audio-fequency data, utilizes recurrent event to trigger the timestamp that regularly upgrades voice playing;
The video playback module, be used to realize checking data, decode video data, the converting video frequency data in video data district form, regulate video and audio frequency synchronously and display video data.
Described trigger condition comprises that Event triggered or timer trigger.
The present invention is implemented in and realizes the synchronously playing audio frequency video data in the BREW environment, and guarantees its fluency and timely response.
Description of drawings
Figure 1 shows that the process flow diagram that network data receives trigger event is set;
Figure 2 shows that the process flow diagram that data stream receives;
Figure 3 shows that the process flow diagram that voice data is play;
Figure 4 shows that the process flow diagram that the audio frequency timer triggers;
Figure 5 shows that the process flow diagram that video data is play;
Figure 6 shows that the process flow diagram that the video timer triggers;
Figure 7 shows that and regulate video display frame process flow diagram at interval.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Because binary runtime environment for wireless do not support multithreading, to realize that at binary runtime environment for wireless the synchronism of audio frequency and video will use the technology based on incident and Time Triggered, be achieved as follows the function of three big modules: data stream receiver module, audio playing module and video playback module.
The data stream receiver module, the main data of being responsible for receiving automatic network.Its function comprises: network data is set receives trigger event; With after having data to arrive, system produces the Data Receiving trigger event, begins to receive data subsequently.
Fig. 1 is provided with the process flow diagram that network data receives trigger event for the data stream receiver module.
In step S101, be connected with server by binary runtime environment for wireless.
In step S102, the Data Receiving trigger event is set.This can be provided with by call function ISOCKET_Readable.
Fig. 2 is after having data to arrive binary runtime environment for wireless, the process flow diagram of receiving data stream.
In step S201, there are data to arrive binary runtime environment for wireless.
In step S202, system produces the Data Receiving trigger event.
In step S203, begin from network receiving stream media data.
In step S204, the voice data in the data stream that receives is put in the audio data region, video data is put in the video data district.
Step S205 is the starting point of voice playing and video playback.
When new data arrived, binary runtime environment for wireless can produce new Data Receiving trigger event automatically, repeats Data Receiving step as shown in Figure 2.
Audio playing module is responsible for playing audio-fequency data.
The process flow diagram that Fig. 3 plays for voice data.
Step S301 in process flow diagram shown in Figure 3, promptly the starting point of voice data playing flow can be the position A of Data Receiving flow chart step S205 shown in Figure 2.
In step S302, check whether the data of audio data region are enough play.The condition of whether enough playing is how many voice datas in audio data district has, or how long the data of audio data region can be play.This value user can set up on their own, as enough playing for 3 seconds.If the voice data of audio data region is play inadequately, jump to step S303 so; If enough playing, data jump to step S304.
In step S303, the arrival of system wait trigger event.After trigger condition satisfies, jump to step S302, continue to check whether the data of audio data region are enough play.The condition that triggers can be an Event triggered, as the Data Receiving trigger event in the data stream receiver module, also can be that timer triggers.Figure 4 shows that the process flow diagram that the audio frequency timer triggers.
In step S304, upgrade audio time stamp.
In step S306, playing audio-fequency data.
In step S307, play voice data after, jump to step S302 and continue to check whether voice data is enough play.
In the starting position of Fig. 3 voice playing process flow diagram, the recurrent event that the voice playing time can be set triggers, and in the process of playing audio-fequency data, the periodic triggers incident satisfies back (S305) in trigger condition, upgrades the timestamp (S304) of voice playing.This timestamp is by the reference of video playback module as reproduction time.The voice data that 500 milliseconds of every broadcasts in the voice playing for example can be set just triggers an incident.Trigger if the recurrent event of voice playing time is set, then the voice data of 1000 milliseconds of every broadcasts of system default just triggers an incident.In the process of voice playing, the timestamp of voice playing since periodic Event triggered by regular renewal.For example, the current time stamp is 1000 milliseconds, and the voice data of crossing 500 milliseconds just triggers an incident, and update of time stamp is 1500 milliseconds after the Event triggered.
The process flow diagram that Fig. 4 triggers for the audio frequency timer.In Fig. 4, audio frequency waiting timer (S401) is set, after the audio frequency waiting timer time arrives (S402), go again to check whether enough data (S302) are arranged in the audio data region.
The video playback module is responsible for playing video data.
The process flow diagram that Fig. 5 plays for video data.
Step S501 in process flow diagram shown in Figure 5, promptly the starting point of video data playing flow can be the position A of Data Receiving flow chart step S205 shown in Figure 2.
At step S502, check whether the data in video data district reach the complete video data of a frame, if the complete video data of the not enough frame of the data of video area jumps to step S503 and waits for triggering; If the enough complete video data of a frame of the data of video area, execution in step S504.
At step S503, the arrival of system wait trigger event.After trigger condition satisfies, forward S502 to and continue to check whether the data in video data district reach the complete video data of a frame.The condition that triggers in step S503 can be an Event triggered, as the Data Receiving trigger event in the data stream receiver module, also can be that timer triggers.Be illustrated in figure 6 as the process flow diagram that the video timer triggers.
In step S504, the enough complete video datas of a frame of the data in video data district, this frame video data of decoding.
In step S505, the data that decoding is come out form a complete BITMAP form bitmap.
In step S506, the BITMAP form bitmap that forms among the step S505 is converted to the form of mobile phone this locality.
In step S507, calculate the difference of video time stamp and audio time stamp, judge audio frequency current playing time stamp and this frame of video timestamp difference (also deserving to be called and stating difference is synchronous error) whether in allowed limits.For example the allowed band of video time stamp and audio time stamp difference can be set between positive and negative 100 milliseconds.
When the difference of video time stamp and audio time stamp not in allowed limits the time, forward step S508 to, judge whether leading audio time stamp of video time stamp.During the leading audio time stamp of video time stamp, according to the difference of video time stamp and audio time stamp the leading timer of video (S509) is set, the leading timer time of video is (S510) then, thereby guarantees synchronous error in allowed limits; When video time stamp falls behind audio time stamp, show that this frame video data is nonsensical, abandon this video data, forward S502 then to and continue to check whether the video data district has the complete video data of a frame.
When the difference of video time stamp and audio time stamp in allowed limits the time, show that this frame video data (S511) forwards step S502 then to and continues to check whether video area has the complete video data of a frame.
In as Fig. 6, video waiting timer (S601) at first is set, after the video waiting timer time arrives (S602), check in the video data district whether the complete video data of a frame (S502) is arranged.
After step S504, step S505, step S506, step S507, can increase timer in short-term, the step below after timer time arrives in short-term, carrying out again.For example, behind this frame video of promptly decoding, 10 milliseconds timer in short-term is set at step S504,10 milliseconds of times to after again execution in step S505 form complete BITMAP form bitmap.Can make mobile phone button request of relative users in time still etc. in the displaying video audio stream like this.
In order to make video playback smooth more, the synchronous error that not only requires voice data and video data also requires the time interval basically identical between any two frame videos in allowed limits.In order to achieve the above object, when synchronous error is in allowed band, can also further regulates frame period and show this frame video data.
Under the situation of audio video synchronization, the time that the time that video accurately shows equals the previous frame demonstration adds the frame period time.The frame period time equals the inverse of frame per second.For example per second shows 5 frame video datas, and the frame period time is 200 milliseconds.In actual play, be good at cannot say for sure between demonstrate,proving two frames shows the mistiming absolutely accurate equal the frame period time, therefore, can set frame of video error interval time (being called the frame period error) allowed band.When the frame period error between two frames in allowed limits the time, think time interval basically identical between the two frame videos, i.e. the broadcast of two frame videos is smooth.It is ± 10% that frame period error allowed band for example is set, and promptly when mistiming that two frames show during at 200 milliseconds, the error range of permission is positive and negative 20 milliseconds.
Fig. 7 is for regulating video display frame process flow diagram at interval.
In Fig. 7, the difference of video time stamp and audio time stamp (S701) in allowed band at first; Judge whether the current time be ahead of the accurate reproduction time of video (S702), the current time directly shows this frame video data (S705) when lagging behind the accurate reproduction time of video; During the accurate reproduction time of leading video of current time, difference timer (S703) is set, the difference timer time shows this frame video data (S705) to (S704).After showing this frame video data (S705), recording played timestamp (S706).In Fig. 7, step S702, S703, S704, S705, the common configuration frame of S706 be adjustment module B at interval.
The difference of the difference timer that is provided with in step S703 satisfies following two conditions:
Condition one, synchronous error are in allowed band; With
Condition two, frame period error are in allowed band.
Condition one can guarantee that video data and voice data are synchronous; Condition two can guarantee video data frame period basically identical, thereby obtains smooth video effect.
In the process of video playback, if select to regulate frame period, can use the step S511 among the frame period adjustment module B replacement Fig. 5 among Fig. 7 so, and when video time stamp falls behind audio time stamp, forward to before the step S706, the recording of video reproduction time stabs, thereby realizes the synchronously playing audio frequency video data in the BREW environment.
Be below on mobile phone, use another embodiment of method audio plays of the present invention and video based on binary runtime environment for wireless.
At first mobile phone is connected with server, and the calling system function is provided with network data and receives trigger event then.
When flow to the BREW terminal that reaches mobile phone from data in server after, system can produce the Data Receiving trigger event, begins to receive data subsequently.Two data fields of system assignment, one is audio data region, one is the video data district.The data stream that arrives the BREW terminal is analyzed, the data of video are put into the video data district, voice data is put into audio data region.
The condition that enough broadcasts for example are set is that the data of audio data region can be play for 5 seconds continuously.Check whether the data of audio data region are enough play.The data of check result discovery audio data region only can play for 3 seconds, and it was 2 seconds that the audio frequency waiting timer is set.After 2 seconds, the audio frequency timer time arrived, check once more whether the data of audio data region are enough.The data of check result audio data region can be play 5 seconds.
The data in playing audio-fequency data district.Finish playing, continue then to check whether audio data region has enough voice datas.
In the recurrent event triggering that begins to be provided with the voice playing time of voice playing, the voice data that for example every broadcast is 500 milliseconds just triggers an incident.In the process of playing audio-fequency data, the timestamp of voice playing since periodic Event triggered by regular renewal, as stabbing now is 1000, just trigger an incident through 500 milliseconds voice datas, after the triggering, update of time stamp is 1500, and after 500 milliseconds, update of time stamp is 2000.
During video playback, check earlier whether the data in video data district reach the complete video data of a frame,, wait for and triggering if not enough.Trigger condition selects for use timer to trigger at this.1 second of video waiting timer for example is set.After 1 second, go again to check whether data are enough.
Behind the data in the video data district video data that enough a frame is complete, just call this frame video of decoder decode.The data that decoding is come out become the color space of RGB24 position by color space transformation, in complete BITMAP form bitmap content of memory field tissue formation, are the form of mobile phone this locality again with this bitmap-converted.
Whether within the range of permission to compare synchronous error subsequently.For example the allowed band of synchronous error is set in positive and negative 100 milliseconds.If the timestamp of audio frequency is 2000, the timestamp of video is 2050, so just can directly show this frame video data.
If whether in advance synchronous error not in allowed limits, will judge video time stamp audio time stamp.When the leading audio time stamp of video time stamp, for example, the timestamp of audio frequency is 2000, the timestamp of video is 2150, and promptly leading (2150-2000)=150 of video millisecond are provided with 150 milliseconds timer this moment, after this timer time arrives, show this frame video again.
When video time stamp fell behind audio time stamp, for example, the timestamp of audio frequency was 2000, and the timestamp of video is 1850, in this case, shows that this frame video data is nonsensical, therefore abandoned this frame data.
In order to make video playback smoothness more, need further to regulate frame period.
For example, per second 5 frame video images are set on the BREW terminal, the frame period time is 200 milliseconds, sets frame period error range ± 10%, and the mistiming that promptly allows the demonstration of two frames is between 200 milliseconds positive and negative 20 milliseconds.
When the time of N frame video playback is 2050, and then the accurate reproduction time of (N+1) frame video should be 2250.If the timestamp of current video is 2230, frame of video is leading 20 milliseconds so, and therefore the frame period error can directly show the video data of present frame within the scope (± 20 milliseconds) that error allows.Or the timestamp of current video is 2220, and frame of video is leading 30 milliseconds so, and the frame period error has surpassed the scope that error allows, and the value that then needs to be provided with the difference timer is 30 milliseconds, regulating frame period, thereby guarantees the video image smoothness play.After the difference timer time arrives, show this frame video.If the timestamp of current video is 2260, expression has lagged behind the accurate demonstration time, then directly shows this frame video.After having shown this frame video data, the value of recording of video timestamp.
At this frame video of decoding, form complete BITMAP form bitmap, with bitmap-converted be the form of mobile phone this locality and show these four steps of this frame video after increase by 10 milliseconds timer, after 10 milliseconds are arrived, continue the step below the execution again.Can make mobile phone in the displaying video audio stream, still can in time respond button request of user etc. like this.
After handling frame data, continue to check the situation in video data district.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1. method that realizes the synchronously playing audio frequency video on binary runtime environment for wireless is characterized in that described method comprises:
One data reception module is set, is used for connecting, the Data Receiving trigger event is set, receive the data of automatic network, and store the data field into network;
One audio playing module is set, is used to check the data of audio data region, playing audio-fequency data, and in the process of playing audio-fequency data, utilize recurrent event to trigger the timestamp that regularly upgrades voice playing;
One video playback module is set, be used to check the video data district data, decode video data, with the format conversion of video data be native format, regulate video and audio frequency synchronously, display video data.
2. the method that realizes the synchronously playing audio frequency video on binary runtime environment for wireless according to claim 1 is characterized in that, the described setting in the audio playing module, and when checking audio zone, when finding that voice data is play inadequately, system forwards to and waits for triggering.
3. the method that realizes the synchronously playing audio frequency video on binary runtime environment for wireless according to claim 2 is characterized in that, the mode that described wait triggers is that Event triggered or timer trigger.
4. the method that realizes the synchronously playing audio frequency video on binary runtime environment for wireless according to claim 3 is characterized in that the incident in the described Event triggered is the Data Receiving trigger event in the data stream receiver module.
5. the method that realizes the synchronously playing audio frequency video on binary runtime environment for wireless according to claim 3 is characterized in that, the step that described timer triggers comprises:
The audio frequency waiting timer is set;
The audio frequency waiting timer time arrives.
6. method according to claim 1 is characterized in that, the step of described voice playing comprises:
Whether step 61, inspection voice data are enough play; When voice data is enough, just forward step 63 to;
Step 62, the condition that wait for to trigger is set, when trigger condition satisfies, returns step 61;
Step 63, playing audio-fequency data, and when playing audio-fequency data, recurrent event triggers upgrades the voice playing timestamp.
Step 64, voice playing are finished and are returned step 61.
7. method according to claim 6, it is characterized in that described voice playing step also comprises, in the recurrent event triggering that begins to be provided with the voice playing time of voice playing part, in the process of playing audio-fequency data, recurrent event triggers the timestamp that regularly upgrades voice playing.
8. method according to claim 1 is characterized in that, described video playback step comprises:
Whether step 801, inspection receive frame complete video data; When receiving frame complete video data, forward step 803 to;
Step 802, the condition that wait for to trigger is set, when condition satisfies, forwards step 801 to;
The video data that step 803, decoding receive;
Step 804, the complete BITMAP form bitmap of formation;
Step 805, bitmap-converted become the form of mobile phone this locality;
The difference of step 806, comparison video time stamp and audio time stamp is if difference in allowed band, forwards step 810 to;
In advance whether step 807, comparison video time stamp audio time stamp, if forward step 809 to;
Step 808, return step 801;
Step 809, the leading timer of video is set, timer time is to forwarding step 806 to;
Step 810, show this frame data, return step 801.
9. method according to claim 8 is characterized in that, in scope, can also further regulate the frame period of video data in the difference of step 806 video time stamp and audio time stamp.
10. method according to claim 9 is characterized in that, the step of the frame period of described adjusting video data comprises:
Step 101, relatively accurate reproduction time of video and current time, the accurate reproduction time of video after, execution in step 102, the accurate reproduction time of video jumps to step 104 preceding;
Step 102, the difference timer is set;
Step 103, difference timer time arrive;
Step 104, frame period are regulated and are finished.
11. method according to claim 1 is characterized in that, the including synchronously of described adjusting video and audio frequency:
The difference of video time stamp and audio time stamp within the range of permission, adjusting is finished;
The difference of video time stamp and audio time stamp is regulated the frame period of video data within the range of permission, and adjusting is finished;
The difference of video time stamp and audio time stamp not within the range of permission, and the leading audio time stamp of video time stamp is provided with the leading timer of video, timer time arrives, adjusting is finished;
The difference of video time stamp and audio time stamp not within the range of permission, and video time stamp falls behind audio time stamp, adjusting is finished;
12. method according to claim 8 is characterized in that, can increase timer in short-term after described step 803, described step 804, step 805, step 806, timer time in short-term to after carry out next step again.
13. method according to claim 8 is characterized in that, the mode that the described wait of step 802 triggers is that Event triggered or timer trigger.
14. a system that realizes the synchronously playing audio frequency video on binary runtime environment for wireless is characterized in that described system comprises data reception module, audio playing module and video playback module; Wherein:
Data reception module is used for realizing connecting with network, and the Data Receiving trigger event is set, and receives the data of automatic network, and stores the data field into;
Audio playing module is used to realize checking the data of audio data region, and playing audio-fequency data in the process of playing audio-fequency data, utilizes recurrent event to trigger the timestamp that regularly upgrades voice playing;
The video playback module, be used to realize checking data, decode video data, the converting video frequency data in video data district form, regulate video and audio frequency synchronously and display video data.
15. the system that realizes the synchronously playing audio frequency video on binary runtime environment for wireless according to claim 14 is characterized in that, described trigger condition comprises that Event triggered or timer trigger.
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