CN103281528A - Streaming media decoding method, system and mobile terminal - Google Patents
Streaming media decoding method, system and mobile terminal Download PDFInfo
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Abstract
The invention discloses a streaming media decoding method, a streaming media decoding system and a mobile terminal. The streaming media decoding system comprises a receiving module, a decoding module and a playing module, wherein the modules interact with one another in an interface calling way according to a media data processing flow, and the modules are low in coupling degree and high in expansibility and reusability. In addition, a de-jittering code stream smoothing mechanism is designed to solve the problem of jitter during the network transmission of streaming media data, so that audios and videos can be smoothly played. For the requirement of a video monitoring system on high-real time performance, a shared memory is designed in a data receiving and processing link to realize the zero copy of reception, decoding and display caching and improve the real-time performance of a player. In a decoding link, a fast forward moving picture experts group (FFMPEG) decoding library is adopted, graphics processing unit (GPU) hardware is called for acceleration, and the GPU operating capability of a display card is fully used for hardware decoding, so that the burden of a central processing unit (CPU) is reduced, the decoding performance is improved, and the average delay time of code stream playing is shortened.
Description
Technical field
The present invention relates to the stream media technology field, particularly a kind of Streaming Media coding/decoding method, system and portable terminal.
Background technology
Stream media technology is rapid in the every field development, and the universal stream media technology that makes deep and broadband network of 3G research has obtained bigger more wide application space.Streaming Media is widely used in the network information services such as video online request, ecommerce, online live, tele-medicine, video conference, network monitoring.We can say that stream media technology has become the main flow of using on the network.Now people have also no longer satisfied the low-quality multimedia messages that transmits on the early stage the Internet, and along with network technology and development of Communication Technique, high-quality high definition stream media has begun to occur gradually.But because the development speed of stream media technology is higher than China's networks development speed far away, the network bandwidth and network quality just become a bottleneck of Streaming Media development.Simultaneously, because the amount of information of high resolution audio and video data is very big, for the client software decoding brings challenges.
In view of this, prior art is still waiting further to improve and improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the streaming media playing effect is subjected to the bigger problem of wireless network bandwidth influence of fluctuations in the prior art to solve to the object of the present invention is to provide a kind of Streaming Media coding/decoding method, system and portable terminal.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of Streaming Media decode system wherein, comprising:
Receiver module sends to following decoder module after being used for accepting the data on the network and described data being organized bag again;
Decoder module is used for utilizing FFMPEG decoding storehouse that the data that receive are decoded, and sends to playing module then;
Playing module is used for the data that the broadcast decoder module sends.
Described Streaming Media decode system, wherein, the data that receive in the described receiver module on the network comprise receiving video data and voice data respectively, and the data that receive are placed in first memory pool of receiver module, in described first memory pool, carry out the data framing, after finishing frame data, semaphore is added 1, and send to buffering area.
Described Streaming Media decode system wherein, is provided with an anti-shake buffering area in the described decoder module, be used for removing the jitter phenomenon of the data in the automatic network by going the dithering cache technology, realizes smoothly playing.
A kind of Streaming Media coding/decoding method of described Streaming Media decode system wherein, said method comprising the steps of:
S1, receiver module send to decoder module after accepting the data on the network and described data being organized bag again;
S2, decoder module utilize FFMPEG decoding storehouse that the data that receive are decoded, and send to playing module then;
The data that S3, playing module broadcast decoder module send.
Described Streaming Media coding/decoding method, wherein, the data that receiver module receives on the network among the described step S1 comprise receiving video data and voice data respectively, then the data that receive are placed in first memory pool of receiver module, in described first memory pool, carry out the data framing, after finishing frame data, semaphore is added 1, and send to buffering area.
Described Streaming Media coding/decoding method, wherein, receiver module need carry out the initialization setting among the described step S1 before the data that receive on the network, and it specifically comprises:
Create TCP class or the UDP class corresponding with TCP pattern or UDP pattern, and corresponding parameter is set, create then and start thread, the state that DST PLAYER is set is RUN.
Described Streaming Media coding/decoding method, wherein, among the described step S2, decoder module is decoded and is specifically comprised: to voice data decoding and video data decoding;
Wherein, described voice data decoding specifically may further comprise the steps:
Receive voice data and voice data is decoded, calculate the frame delay time then whether within predetermined threshold range, if then whether the judgment frame delay time is greater than 0, if then set delay time, upgrade the audio output buffer district.
Described Streaming Media coding/decoding method, wherein, among the described step S2, decoder module removes the jitter phenomenon of the data in the automatic network by going the dithering cache technology, realizes smoothly playing.
A kind of portable terminal wherein, comprises described Streaming Media decode system.
Described portable terminal, wherein, described portable terminal is mobile phone, PAD or digital camera.
Compared to prior art, Streaming Media coding/decoding method provided by the invention, system and portable terminal.Wherein said Streaming Media decode system comprises receiver module, decoder module and playing module, according to the media data handling process, is undertaken alternately by interface interchange between each module, and the intermodule degree of coupling is low, autgmentability is high, reusability is good.In addition, at the jitter problem of stream medium data network transmission, designed the sliding mechanism of dither code levelling of going.Buffer memory video image before play starting, according to code stream frame rate carry out timing decode send apparent, thereby alleviate the shake that the network transmission brings, guarantee that audio frequency and video can smoothly play.At the high real-time requirement of video monitoring system, receive and processing links in data, the design shared drive to realize the zero-copy of reception, decoding and display buffer, improves the player real-time; In the decoding link, adopt FFMPEG decoding storehouse, it is hardware-accelerated to call GPU, and the GPU operational capability that takes full advantage of video card is carried out the hardware decoding, alleviates the CPU burden, improves decoding performance, and shorten the average delay time that code stream is play.
Description of drawings
Fig. 1 is the structured flowchart of Streaming Media decode system provided by the invention.
Fig. 2 is the workflow diagram of receiver module among the embodiment of Streaming Media decode system provided by the invention.
Fig. 3 is the initialized flow chart of receiver module among the embodiment of Streaming Media decode system provided by the invention.
Fig. 4 is the schematic diagram of the workflow of receiver module among the embodiment of Streaming Media decode system provided by the invention.
Fig. 5 is the schematic diagram of the video decode workflow of decoder module among the embodiment of Streaming Media decode system provided by the invention.
Fig. 6 is the schematic diagram of the video section decoding workflow in the video decode among Fig. 5.
Fig. 7 is the schematic diagram of the audio-frequency unit decoding workflow in the video decode among Fig. 5.
Fig. 8 is for removing the flow chart of dithering cache among the embodiment of Streaming Media decode system provided by the invention.
Fig. 9 is the schematic diagram that internal memory is shared among the embodiment of Streaming Media decode system provided by the invention.
Figure 10 is the flow chart of audio-visual synchronization among the embodiment of Streaming Media decode system provided by the invention.
Figure 11 is the flow chart of Streaming Media coding/decoding method provided by the invention.
Embodiment
For making purpose of the present invention, technical scheme and effect clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
See also Fig. 1, it is the structured flowchart of Streaming Media decode system of the present invention.As shown in the figure, described Streaming Media decode system comprises:
Streaming Media decode system of the present invention utilizes idea of modular, and whole Streaming Media decode system is divided into three modules.Wherein, receiver module is accepted the data on the network and is organized bag again; Decoder module is with the data decode that receives; Data behind the playing module broadcast decoder.According to data flow, these modules are stratified, begin to be followed successively by from bottom: receiver module, decoder module, playing module.
Be introduced at the above-mentioned functions module respectively below:
Please continue to consult Fig. 4, it is the operational flow diagram of receiver module run.Because decoder must begin decoding from the I frame, so receiver module need be waited for the I frame, before receiving first I frame, must abandon the P frame that all receive; After receiving first I frame, receiver module brings into operation, the packet after receiving.After receiving frame data of finishing when receiver module, handle, and pass to decoder module and decode.
Utilize hardware capability when utilizing the decoding of FFMPEG decoding storehouse in the described decoder module 200, HD video is carried out the hardware decoding.Its semaphore determines the Voice ﹠ Video data of receiver module.The semaphore of decoder module depends on the signal of receiver module.The semaphore of receiver module is 0, and buffering area does not have data, otherwise then data is arranged.When having data, buffering area just need decoder module to read data and by decoder decode from buffering area.After the data decode, enter buffering area, this moment, the output signal amount of decoder module increased by 1, the notice playing module.Video decode is two different processes with audio decoder, and the thread of its operation is also different, and video decode at first will not put parameter, its flow process such as Fig. 5.Wherein, the flow chart of video section in video decode decoding as shown in Figure 6, and the audio decoder part is as shown in Figure 7.Be that example is introduced now with the audio decoder: please continue to consult Fig. 7, at first, receive voice data and voice data is decoded, whether in predetermined threshold range (in the present embodiment to calculate the frame delay time then, threshold range for ﹣ 40ms to 40ms) within, if then whether the judgment frame delay time is greater than 0, if then set delay time, upgrade the audio output buffer district.
Be, the thread of audio decoder is a circulation with should be noted that, if but wherein taking place unusually, thread just withdraws from so.Audio decoder thread and video decode thread are synchronous.
Just can play after the data decode and export.In playing module 300, the semaphore that passes through of operation is controlled.Decoder module is decoded after a frame finishes, the output signal amount, and this semaphore is set to the input signal amount of playing module, and like this, playing module reads data and plays from the buffer memory of decoder module, play frame data, and semaphore subtracts l.
Further, data are transmitted in the network that does not have QoS to guarantee, there is a variable quantity in the transmission time that arrives receiving terminal, is also referred to as shake.The mode of employing buffer memory guarantees the performance of DST PLAYER, and the realization audio frequency and video are smoothly play.Go the workflow of dithering cache as shown in Figure 8.
Streaming Media decode system shared drive of the present invention as shown in Figure 9, mainly contains two internal memories and shares, and one is (to represent with memory pool among the figure) between receiver module and decoder module, the former output and the latter's input shared drive; Another then is (to represent with memory pool among the figure) between decoder module and playing module, and an internal memory is also shared in the former output and the latter's input.By share memory technology, reduced the data copy, improve broadcast performance.
In addition, among the embodiment of Streaming Media decode system of the present invention, with 125ms as the reference time, the time difference at 125ms with the interior tolerance interval that belongs to.Before the audio/video decoding, need the current not difference of the audio frequency and video timestamp of decoding of coupling.Timestamp time and the video frame time stamp time of audio pack compare, if do not reach the reference time, then decoding is play; If reach the reference time, illustrate that then this frame of video lags behind, abandon this frame of video, receive next frame of video, move in circles, receive the finish command up to thread and stop.Reference time is got 125ms.Be the time of video time stamp time-audio time stamp〉125ms, then lose the frame of video in the buffer memory, flow chart is as 10.
Streaming Media decode system of the present invention can be applied to mobile terminal device in the mode of application software, such as: PDA, mobile phone, digital camera.
The present invention also provides a kind of Streaming Media coding/decoding method, as shown in figure 11, said method comprising the steps of:
S1, receiver module send to decoder module after accepting the data on the network and described data being organized bag again;
S2, decoder module utilize FFMPEG decoding storehouse that the data that receive are decoded, and send to playing module then;
The data that S3, playing module broadcast decoder module send.
Further, among the described step S2, decoder module is decoded and is specifically comprised: to voice data decoding and video data decoding;
Wherein, described voice data decoding specifically may further comprise the steps:
Receive voice data and voice data is decoded, calculate the frame delay time then whether within predetermined threshold range, if then whether the judgment frame delay time is greater than 0, if then set delay time, upgrade the audio output buffer district.In addition, among the described step S2, decoder module removes the jitter phenomenon of the data in the automatic network by going the dithering cache technology, realizes smoothly playing.
In sum, Streaming Media coding/decoding method provided by the invention, system and portable terminal.Wherein said Streaming Media decode system comprises receiver module, decoder module and playing module, according to the media data handling process, is undertaken alternately by interface interchange between each module, and the intermodule degree of coupling is low, autgmentability is high, reusability is good.In addition, at the jitter problem of stream medium data network transmission, designed the sliding mechanism of dither code levelling of going.Buffer memory video image before play starting, according to code stream frame rate carry out timing decode send apparent, thereby alleviate the shake that the network transmission brings, guarantee that audio frequency and video can smoothly play.At the high real-time requirement of video monitoring system, receive and processing links in data, the design shared drive to realize the zero-copy of reception, decoding and display buffer, improves the player real-time; In the decoding link, adopt FFMPEG decoding storehouse, it is hardware-accelerated to call GPU, and the GPU operational capability that takes full advantage of video card is carried out the hardware decoding, alleviates the CPU burden, improves decoding performance, and shorten the average delay time that code stream is play.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a Streaming Media decode system is characterized in that, comprising:
Receiver module sends to following decoder module after being used for accepting the data on the network and described data being organized bag again;
Decoder module is used for utilizing FFMPEG decoding storehouse that the data that receive are decoded, and sends to playing module then;
Playing module is used for the data that the broadcast decoder module sends.
2. Streaming Media decode system according to claim 1, it is characterized in that, the data that receive in the described receiver module on the network comprise receiving video data and voice data respectively, and the data that receive are placed in first memory pool of receiver module, in described first memory pool, carry out the data framing, after finishing frame data, semaphore is added 1, and send to buffering area.
3. Streaming Media decode system according to claim 1 is characterized in that, is provided with an anti-shake buffering area in the described decoder module, is used for removing the jitter phenomenon of the data in the automatic network by going the dithering cache technology, realizes smoothly playing.
4. the Streaming Media coding/decoding method of the described Streaming Media decode system of claim 1 is characterized in that, said method comprising the steps of:
S1, receiver module send to decoder module after accepting the data on the network and described data being organized bag again;
S2, decoder module utilize FFMPEG decoding storehouse that the data that receive are decoded, and send to playing module then;
The data that S3, playing module broadcast decoder module send.
5. Streaming Media coding/decoding method according to claim 4, it is characterized in that, the data that receiver module receives on the network among the described step S1 comprise receiving video data and voice data respectively, then the data that receive are placed in first memory pool of receiver module, in described first memory pool, carry out the data framing, after finishing frame data, semaphore is added 1, and send to buffering area.
6. Streaming Media coding/decoding method according to claim 4 is characterized in that, receiver module need carry out the initialization setting among the described step S1 before the data that receive on the network, and it specifically comprises:
Create TCP class or the UDP class corresponding with TCP pattern or UDP pattern, and corresponding parameter is set, create then and start thread, the state that DST PLAYER is set is RUN.
7. Streaming Media coding/decoding method according to claim 4 is characterized in that, among the described step S2, decoder module is decoded and specifically comprised: to voice data decoding and video data decoding;
Wherein, described voice data decoding specifically may further comprise the steps:
Receive voice data and voice data is decoded, calculate the frame delay time then whether within predetermined threshold range, if then whether the judgment frame delay time is greater than 0, if then set delay time, upgrade the audio output buffer district.
8. Streaming Media coding/decoding method according to claim 4 is characterized in that, among the described step S2, decoder module removes the jitter phenomenon of the data in the automatic network by going the dithering cache technology, realizes smoothly playing.
9. a portable terminal is characterized in that, comprises the described Streaming Media decode system of claim 1.
10. portable terminal according to claim 9 is characterized in that, described portable terminal is mobile phone, PAD or digital camera.
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| CN113840161A (en) * | 2020-06-23 | 2021-12-24 | 龙芯中科技术股份有限公司 | Streaming media transmission method, receiving method, device, electronic equipment and storage medium |
| CN113840161B (en) * | 2020-06-23 | 2023-07-25 | 龙芯中科技术股份有限公司 | Streaming media transmission method, receiving method, device, electronic equipment and storage medium |
| CN111953992A (en) * | 2020-07-07 | 2020-11-17 | 西安万像电子科技有限公司 | Decoding method and device |
| CN112929114A (en) * | 2021-01-26 | 2021-06-08 | 广州市保伦电子有限公司 | Low-delay audio distribution method, module and device based on network card |
| CN113645192A (en) * | 2021-07-16 | 2021-11-12 | 青岛小鸟看看科技有限公司 | RTP data packet processing method and device |
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