CN102869046A - Video transmission method and device for wireless network - Google Patents
Video transmission method and device for wireless network Download PDFInfo
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Abstract
The invention relates to field of wireless network communication and discloses a video transmission method and device or a wireless network. According to the invention, if the network transmission state is monitored to be jammed, the video code stream is firstly subjected to first level frame rate reduction processing, if the network transmission state is still jammed in the preset time duration after the first level frame rate reduction processing, the video code stream is subjected to second level frame rate reduction processing, so that the video effect is smoother and unhindered. During frame rate reduction processing, the current content of a buffer area of the application layer is maintained, only the newly-generated video code stream is coded and compressed, and the monitoring video is more continuous. If the network transmission state is monitored to be not jammed in the preset time duration after the frame rate reduction processing, the low-speed frame rate increasing mechanism is adopted, and if the network environment becomes worse again, the quick frame rate reduction processing is carried out.
Description
Technical field
The present invention relates to the wireless communication field, particularly video narrow band transmission technology in the wireless network.
Background technology
Under current environment, the mobile application become more and more extensive, and also more and more urgent to the demand of network, wireless video monitoring is as a key areas under the wireless network environment, also in development at full speed.Wireless video monitoring mainly is to utilize the signals such as Techniques Used in Digital Microwave Transmission technical transmission video, sound, data.First Video coding is compressed, then by the digital microwave Channel Modulation, go out by antenna transmission again, receiving terminal is then opposite, antenna receiving signal, microwave despreading, video decompression, the vision signal of last reduction and simulation, but also by computer corresponding decoding software is installed after the microwave despreading, with computer software decoding video, and computer is also supported video recording, playback, management, the functions such as controlling alarm.
The present inventor finds, under wireless network environment, because host-host protocol restriction and network condition are unstable, causes frame loss condition serious, the imperfection defective that causes to a certain extent data to send.Simultaneously, the network environment of network equipment terminal is judged single inaccurate, so that data transmission jitter is large.So, demand urgently needing a kind of wireless network video transmission method, so that the transmission of wireless network video code flow is complete, result of broadcast is smoothly smooth and easy.
Summary of the invention
The object of the present invention is to provide video transmission method and device thereof in a kind of wireless network, make video effect more level and smooth and smooth and easy, adapt to better wireless network and change faster situation.
For solving the problems of the technologies described above, embodiments of the present invention provide video transmission method in a kind of wireless network, may further comprise the steps:
The monitoring network transmission state;
Be congested if monitor the current network transmission state, then video code flow carried out the first order and fall frame and process;
Fall frame in the first order and process in the rear scheduled duration, if monitor the current network transmission state still for congested, then video code flow is carried out the second level and fall the frame processing.
Embodiments of the present invention also provide video frequency transmitter in a kind of wireless network, comprise with lower module:
Monitoring modular is used for the monitoring current network state;
The frame processing module falls in the first order, is congested if be used for monitoring module monitors to the current network transmission state, then video code flow is carried out the first order and falls the frame processing;
The frame processing module falls in the second level, be used for the first order fall the frame processing module carry out the first order fall frame process after in the scheduled duration, if monitoring module monitors still is congested to the current network transmission state, then video code flow is carried out the second level and falls the frame processing.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
During network congestion, first video code flow is carried out the first order and fall frame and process, still keep congestion state if fall behind the frame in the scheduled duration, then video code flow carries out the second level and falls frame and process, thereby applicable wireless network changes faster situation better, makes video effect more level and smooth and smooth and easy.
Further, when falling the frame processing, keep the current content of application layer buffering area, only newly-generated video code flow is carried out the coding of low quality or low code check or high compression rate, can prevent from making monitor video more continuous because abandon the jump problem of (be called second jump) of meaningful in the application layer buffering area and picture level second that is directed at.
Further, judge during the monitoring network transmission state whether the current congestion network environment reverts to not congested network, if, then can adopt and rise at a slow speed the frame transmission mechanism and transmit, so that network data even variation and the jitter of transmission are little, if rise at a slow speed in the process of frame processing at this, network environment is variation again, data volume in the application layer buffering area surpasses predetermined threshold, then can carry out fast prompt drop frame and process, this network environment adaptation mechanism that falls soon that rises has slowly been carried out the multiple judgement of network scenarios, so that the monitoring of Internet Transmission state is more accurate, for realizing smoothly providing precondition with smoothly video code flow transmission.
Further, according to the multiple judgement of above-mentioned network environment and monitoring result, by every grade of fast prompt drop frame treatment measures of falling half, not only realized the network environment self adaptation adjustment of video code flow transmission, and adapted to wireless network environment and change faster situation, thereby reach level and smooth and video code flow laser propagation effect smoothly.
Further, application layer buffer data bag is carried out equalization to be split, packet after the fractionation is less than the IP layer maximum path transmission unit of gateway regulation in the wireless netting twine network, can be so that the number of retransmissions of video code flow in transmission course obviously reduce, thus the throughput of whole system improved under one's name.
Further, the transmitted data on network bag is comprised of packet header and data, because the encapsulation of bottom can increase the size of bag, preferably the application layer data bag size after the impartial fractionation of restriction is 90 to 96% of gateway permissible flow, if the application layer data Bao Taida after splitting, then the size after the encapsulation can surpass the restriction of gateway, frame losing and number of retransmissions will showed increased, increased cost on network communication, in the serious situation, easily so that network paralysis; If the application layer data Bao Taixiao after splitting, the expense relative scale of encapsulation is higher, has reduced communication efficiency.
Description of drawings
Fig. 1 is the schematic flow sheet of video transmission method in a kind of wireless network in the first embodiment of the invention;
Fig. 2 is the schematic flow sheet of video transmission method in a kind of wireless network in the second embodiment of the invention;
Fig. 3 is the structural representation of video frequency transmitter in a kind of wireless network in the four embodiment of the invention;
Fig. 4 is the structural representation of video frequency transmitter in a kind of wireless network in the fifth embodiment of the invention;
Fig. 5 is the structural representation of video frequency transmitter in a kind of wireless network in the sixth embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.
First embodiment of the invention relates to video transmission method in a kind of wireless network.Fig. 1 is the schematic flow sheet of video transmission method in this wireless network.Video transmission method may further comprise the steps in this wireless network:
In step 101, the monitoring network transmission state.
After this enter step 102, judge whether current network state is congested.
If then enter step 103; If not, then return step 102.
Preferably, can judge in the following manner:
Judge whether the data volume in the application layer buffering area surpasses predetermined threshold, if then the current network transmission state is congested, if not, then the current network transmission state is not for congested.
In some other examples of the present invention, also can use other mode to judge whether the current network transmission state is congested, for example according to the network bottom layer data volume that reality sends in the duration of predesignating recently.
In step 103, be congested if monitor the current network transmission state, then video code flow is carried out the first order and fall the frame processing.
After this enter step 104, judge whether current network state is congested.
If then enter step 105; If not, then return step 104.
In step 105, fall frame in the first order and process in the rear scheduled duration, if monitor the current network transmission state still for congested, then video code flow is carried out the second level and fall frame processing, after this process ends.
During network congestion, first video code flow is carried out the first order and fall frame and process, still keep congestion state if fall behind the frame in the scheduled duration, then video code flow carries out the second level and falls frame and process, thereby applicable wireless network changes faster situation better, makes video effect more level and smooth and smooth and easy.
In some other examples of the present invention, also can there be the more multi-level frame that falls to process, for example, fall after frame processes when video code flow being carried out the second level, the current network transmission state still be congested, that can carry out the third level falls the frame processing.
The amplitude of frame falls in the first order can be the same with the second level, also can be different.
Preferably, the first order falls that frame is processed or the second level falls the step that frame processes and can comprise following substep:
Keep the current content of application layer buffering area, when newly-generated video code flow, encode with lower picture quality, lower code check or the higher coded system of compression ratio, add again the application layer buffering area.
When falling the frame processing, keep the current content of application layer buffering area, only newly-generated video code flow is carried out the coding of low quality or low code check or high compression rate, can prevent from making monitor video more continuous because abandon the jump problem of (be called second jump) of meaningful in the application layer buffering area and picture level second that is directed at.
In some other examples of the present invention, when falling the frame processing, also can not exclusively keep the current content of application layer buffering area, but being carried out some, the current content of application layer buffering area processes, as wherein B frame and P frame are removed, only keep the I frame, etc.
Second embodiment of the invention relates to video transmission method in a kind of wireless network.
The second execution mode improves on the basis of the first execution mode, main improvements are: judge during the monitoring network transmission state whether the current congestion network environment reverts to not congested network, if, then can adopt and rise at a slow speed the frame transmission mechanism and transmit, so that network data even variation and the jitter of transmission are little, if rise at a slow speed in the process of frame processing at this, network environment is variation again, data volume in the application layer buffering area surpasses predetermined threshold, then can carry out fast prompt drop frame processes, this network environment adaptation mechanism that falls soon that rises slowly, carried out the multiple judgement of network scenarios, so that the monitoring of Internet Transmission state is more accurate, for realizing smoothly providing precondition with smoothly video code flow transmission.
Specifically:
Falling frame in the first order processes in the rear scheduled duration, if monitor the current network transmission state not for congested, the frame that rises that then periodically video code flow is carried out first mode is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the first order is fallen frame and is processed the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of first mode.
Fall frame processes in the rear scheduled duration in the second level, if monitor the current network transmission state not for congested, the frame that rises that then periodically video code flow is carried out the second pattern is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the second level falls frame and processes the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of the second pattern.
When rising the frame processing, keep the current content of application layer buffering area, when newly-generated video code flow, encode with higher picture quality, higher code check or the lower coded system of compression ratio, add again the application layer buffering area.
Preferably, falling the required bandwidth of video code flow that generates after frame is processed in the first order is that half of the required bandwidth of video code flow that frame generates before processing falls in the first order.
Preferably, falling the required bandwidth of video code flow that generates after frame is processed in the second level is that half of the required bandwidth of video code flow that frame generates before processing falls in the second level.
According to the multiple judgement of above-mentioned network environment and monitoring result, by every grade of fast prompt drop frame treatment measures of falling half, not only realized the network environment self adaptation adjustment of video code flow transmission, and adapted to wireless network environment and change faster situation, thereby reach level and smooth and video code flow laser propagation effect smoothly.
Fast prompt drop frame is processed and is referred to that the frame processing falls in the first order or the current content of reservation application layer buffering area in the frame processing method falls in the second level, when newly-generated video code flow, encode with lower picture quality, lower code check or the higher coded system of compression ratio, so that current video bit stream data compression factor reaches after 50%, add again the application layer buffering area.
Fig. 2 is a schematic flow sheet in the object lesson.
In step 201, monitoring judges whether current network state is congested.
If then enter step 202; If not, then return step 201 and continue monitoring.
In step 202, carry out the first order and fall the frame processing.
After this enter step 203, monitoring judges whether the current congestion network state reverts to not congested.
If then enter step 204; If not, then enter step 207.
In step 204, carry out first mode and rise the frame processing.
After this enter step 205, monitoring judges whether current network is congested.
If then return step 202 and carry out the first order and fall frame and process; If not, then enter step 206.
In step 206, judge whether current network flow reaches the default parameters setting.
If then return step 201 monitoring and judge whether current network state is congested; If not, then returning step 204 carries out first mode and rises frame and process.
In step 207, if judging the congested network state, monitoring do not recover, then carry out the second level and fall the frame processing.
After this enter step 208, monitoring judges whether current network state reverts to not congested.
If then enter step 209; If not, then return step 208 monitoring and judge whether current network state reverts to not congested.
In step 209, carry out the second pattern and rise the frame processing.
After this enter step 210, monitoring judges whether current network state is congested.
If then return step 207 and carry out the second level and fall frame and process; If not, then enter step 211.
In step 211, judge whether current network flow reaches the default parameters setting.
If then return step 201 monitoring and judge whether current network is congested; If not, then returning step 209 carries out the second pattern and rises frame and process.
In order better present embodiment to be described, here for the example of a hypothesis.The default bandwidth of supposing wireless network is 1M, and the first order is fallen the frame processing and dropped to 512K, and the second level falls the frame processing and drops to 256K, and first mode rises frame and processes each 100K that rises, and the second pattern rises frame and processes each 50K that rises.In step 201, be judged to be congestedly by monitoring, then in step 202, carry out the first order and fall frame and process, drop to 512K.After this decision network state rises the frame processing for recovering, then enter to carry out first mode in the step 204 in step 203, rises 100K, and current bandwidth is 612K.After this in step 205, be judged as again congestedly, again to carry out 202 the first order and fall frame and process, current bandwidth drops to 512K again.After this network state is not judged as recovery in step 203, then enters step 207, carries out the second level and falls the frame processing, and current bandwidth drops to 256K.After this in a period of time, because network never recovers, then repeatedly execution in step 208, constantly monitoring network state.After a period of time, complete network recovers, and enters step 209 and carries out the second pattern and rises the frame processing, rises 50K, and current bandwidth is 306K.After this network is always normal, rises the frame processing so constantly carry out the second pattern, until reach the default bandwidth of 1M, gets back to step 201.
In some other examples of the present invention, fast prompt drop frame process be not limited to that every grade of equalization of falling half splits degradation the frame treatment mechanism falls, can also be as the case may be and application demand, adopt other the frame treatment mechanism of falling to fall frame, such as, when network environment degree of Congestion height, when fail safe and robustness require to hang down, can fall the higher ratio of frame at every grade, be 80% etc. such as current video bit stream data compression factor.
Third embodiment of the invention relates to video transmission method in a kind of wireless network.
The 3rd execution mode improves on the basis of the first or second execution mode, main improvements are: application layer buffer data bag is carried out equalization split, packet after the fractionation is less than the IP layer maximum path transmission unit of gateway regulation in the wireless netting twine network, can be so that the number of retransmissions of video code flow in transmission course obviously reduce, thus the throughput of whole system obviously improved.
Specifically:
In the application layer buffering area, the packet of video code flow is carried out equalization split, the packet after the fractionation is less than the size of the IP layer maximum path transmission unit of gateway regulation in the wireless network.
Having a strong impact on net environment looks the real-time Transmission performance factor of audio transmission the serious packet loss of network is arranged, and the widely used host-host protocol exploitation of current wireless network mainly is based on cable network, suppose that link is the condition of zero defect, the data-bag lost unification is thought because the packet loss problem that network congestion causes, can think, when this view had directly caused this type of host-host protocol to be applied to wireless network, throughput of system will seriously glide.
Because gateway limits the size of packet, and the restriction of network IP layer maximum path transmission unit, etc. the restriction, therefore can split the current video codeword data stream bag that is retained in the application layer buffering area according to actual concrete condition, this transmission technology that will larger packet be split as less packet, the number of retransmissions of packet is significantly reduced, thereby improve the purpose of throughput of system.
Preferably, the packet loss type is not distinguished for transport layer in the ICP/IP protocol stack, can be checked the packet loss number of times by the TcpStatShow () function that calls bottom, comparing calculating, find that the average ratio that retransmits can reach 1: 3, has greatly improved throughput of system.
The transmitted data on network bag is comprised of packet header and data, because the encapsulation of bottom can increase the size of bag, preferably the application layer data bag size after the impartial fractionation of restriction is 90 to 96% of gateway permissible flow, if the application layer data Bao Taida after splitting, then the size after the encapsulation can surpass the restriction of gateway.If the application layer data Bao Taixiao after splitting, the regular meeting that compares of the expense of encapsulation is higher, has reduced the efficient of communication.
In some other examples of the present invention, the size of the impartial application layer data bag that splits also can be take other standard as restriction, such as the certain proportion of the maximum path transmission unit that is not more than the IP layer, etc.
In some other examples of the present invention, also can adopt the mode of unequal fractionation to process using the layer data bag, just passable as long as the application layer data bag size that splits meets the restriction of gateway.
Each method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the memory of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).Equally, memory can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") etc.
Four embodiment of the invention relates to video frequency transmitter in a kind of wireless network.Fig. 3 is the structural representation of video frequency transmitter in this wireless network.Video frequency transmitter comprises with lower module in this wireless network:
Monitoring modular is used for the monitoring current network state, if the data volume in the application layer buffering area surpasses predetermined threshold, then output expression current network transmission state is congested signal, otherwise output expression current network is transmitted as not congested signal.
The frame processing module falls in the first order, is congested if be used for monitoring module monitors to the current network transmission state, then video code flow is carried out the first order and falls the frame processing.
The frame processing module falls in the second level, be used for the first order fall the frame processing module carry out the first order fall frame process after in the scheduled duration, if monitoring module monitors still is congested to the current network transmission state, then video code flow is carried out the second level and falls the frame processing.
The application layer buffering area is used for the video code flow of needs transmission is cushioned.
The first order falls the frame processing module and the second level falls the frame processing module when falling the frame processing, keep the current content of application layer buffering area, when newly-generated video code flow, encode with lower picture quality, lower code check or the higher coded system of compression ratio, add again the application layer buffering area.
The first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in the first execution mode.
Fifth embodiment of the invention relates to video frequency transmitter in a kind of wireless network.Fig. 4 is the structural representation of video frequency transmitter in this wireless network.
The 5th execution mode improves on the basis of the 4th execution mode, main improvements are: increased that the first order rises frame module and the second level rises frame module, be used for the corresponding first order fall frame module and the second level fall frame module fall frame process after in the scheduled duration, if monitoring module monitors is not congested to the current network transmission state, the frame that rises that then periodically video code flow is carried out corresponding pattern is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the first order falls that frame is processed or the second level falls frame and processes the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of associative mode.
Specifically:
The first order rises frame module, being used for falling the frame processing module first order in the first order falls in the rear scheduled duration of frame processing, if monitoring module monitors is not congested to the current network transmission state, the frame that rises that then periodically video code flow is carried out first mode is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the first order is fallen frame and is processed the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of first mode.
The second level rises frame module, being used for falling the frame processing module second level in the second level falls in the rear scheduled duration of frame processing, if monitoring module monitors is not congested to the current network transmission state, the frame that rises that then periodically video code flow is carried out the second pattern is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the second level falls frame and processes the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of the second pattern.
As a preferred embodiment of the present invention, falling the frame processing module first order in the first order falls in the rear scheduled duration of frame 50% processing, if monitor the current network transmission state not for congested, the first order rises frame module and rises at a slow speed the frame processing, so that falling in the first order, frame processes the decline degree 50% of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of first mode, such as 10% to 20%, until video code flow returns to default parameters or the current network transmission state is congested again, if video code flow returns to default parameters, then current network state is judged in monitoring again, if the current network transmission state is congested again, then proceeding the first order falls the frame processing module first order and falls frame and process, so that the amplitude of frame falls before remaining in the decrease speed of current overall network flow, namely 50% of total flow.
If fall the frame processing module first order and fall after frame 50% processes carrying out the first order, if monitor the current network transmission state still for blocking, then the second level falls the frame processing module and remaining 50% of network total flow is carried out the second level falls frame and process, in scheduled duration after this, if monitor the current network transmission state not for congested, the second level rises frame module and rises at a slow speed the frame processing, so that falling in the second level, frame processes the decline degree 50% of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of the second pattern, such as 10% to 20%, until the current network transmission state is congested again, then proceeding the second level falls the frame processing module second level and falls frame and process, until the current network transmission state transmits according to current transmission mode for not congested.
In some other examples of the present invention, what the first order rose that frame module or the second level rises frame module rises the frame principle, as the case may be and practical application, can be identical, can also be different.
The second execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the second execution mode.The correlation technique details of mentioning in the second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in the second execution mode.
Sixth embodiment of the invention relates to video frequency transmitter in a kind of wireless network.Fig. 5 is the structural representation of video frequency transmitter in this wireless network.
The 6th execution mode improves on the basis of the 4th execution mode, and main improvements are: increased the fractionation module, so that the packet header of the video codeword data stream bag of Internet Transmission and ratio data balance guarantee data integrity and fail safe.
Specifically:
This splits module, is used for packet to the video code flow of application layer buffering area and carries out equalization and split, the size of the IP layer maximum path transmission unit that the packet after the fractionation is stipulated less than gateway in the wireless network.Guarantee data integrity and during fail safe, the size of the packet after preferably restriction splits be gateway regulation in the wireless network IP layer maximum path transmission unit size 90% to 96%.
The 3rd execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the 3rd execution mode.The correlation technique details of mentioning in the 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in the 3rd execution mode.
Need to prove, each module of mentioning in each module execution mode of the present invention all is logic module, physically, a logic module can be a physical module, it also can be the part of a physical module, can also realize that the physics realization mode of these logic modules itself is not most important with the combination of a plurality of physical modules, the combination of the function that these logic modules realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each the module execution mode of the present invention will not too close module not introduced with solving technical problem relation proposed by the invention, and this does not show that there is not other module in the said equipment execution mode.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. video transmission method in the wireless network is characterized in that, may further comprise the steps:
The monitoring network transmission state;
Be congested if monitor the current network transmission state, then video code flow carried out the first order and fall frame and process;
Fall frame in the described first order and process in the rear scheduled duration, if monitor the current network transmission state still for congested, then video code flow is carried out the second level and fall the frame processing.
2. video transmission method in the wireless network according to claim 1 is characterized in that, the described first order falls that frame is processed or the second level falls the step that frame processes and comprises following substep:
Keep the current content of application layer buffering area, when newly-generated video code flow, encode with lower picture quality, lower code check or the higher coded system of compression ratio, add again the application layer buffering area.
3. video transmission method in the wireless network according to claim 2 is characterized in that, and is further comprising the steps of:
Falling frame in the described first order processes in the rear scheduled duration, if monitor the current network transmission state not for congested, the frame that rises that then periodically video code flow is carried out first mode is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the first order is fallen frame and is processed the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of first mode;
Fall frame processes in the rear scheduled duration in the described second level, if monitor the current network transmission state not for congested, the frame that rises that then periodically video code flow is carried out the second pattern is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the second level falls frame and processes the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of the second pattern.
4. video transmission method in the wireless network according to claim 3 is characterized in that, falling the required bandwidth of video code flow that generates after frame is processed in the described first order is that half of the required bandwidth of video code flow that frame generates before processing falls in the described first order;
Fall the required bandwidth of video code flow that generates after frame is processed in the described second level and be the described second level and fall half of the required bandwidth of video code flow that frame generates before processing.
5. video transmission method in the wireless network according to claim 4 is characterized in that, the step of described monitoring network transmission state may further comprise the steps:
Judge whether the data volume in the application layer buffering area surpasses predetermined threshold, if then the current network transmission state is congested, if not, then the current network transmission state is not for congested.
6. video transmission method in each described wireless network in 5 according to claim 1 is characterized in that, and is further comprising the steps of:
In the application layer buffering area, the packet of video code flow is carried out equalization split, the packet after the fractionation is less than the size of the IP layer maximum path transmission unit of gateway regulation in the wireless network.
7. video frequency transmitter in the wireless network is characterized in that, comprises with lower module:
Monitoring modular is used for the monitoring current network state;
The frame processing module falls in the first order, is congested if be used for described monitoring module monitors to the current network transmission state, then video code flow is carried out the first order and falls the frame processing;
The frame processing module falls in the second level, be used for the described first order fall the frame processing module carry out the first order fall frame process after in the scheduled duration, if described monitoring module monitors still is congested to the current network transmission state, then video code flow is carried out the second level and falls the frame processing.
8. video frequency transmitter in the wireless network according to claim 7 is characterized in that, comprises following submodule:
The first order rises frame module, being used for falling the frame processing module first order in the described first order falls in the rear scheduled duration of frame processing, if monitor the current network transmission state not for congested, the frame that rises that then periodically video code flow is carried out first mode is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the first order is fallen frame and is processed the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of first mode;
The second level rises frame module, being used for falling the frame processing module second level in the described second level falls in the rear scheduled duration of frame processing, if monitor the current network transmission state not for congested, the frame that rises that then periodically video code flow is carried out the second pattern is at least one times processed, until video code flow returns to default parameters or current network transmission state again for congested, wherein the second level falls frame and processes the decline degree of the network traffics that cause greater than the rising degree that frame is processed the network traffics that cause that rises of the second pattern.
9. video frequency transmitter in the wireless network according to claim 8 is characterized in that, also comprises:
The application layer buffering area is used for the video code flow of needs transmission is cushioned;
The described first order falls the frame processing module and the second level falls the frame processing module when falling the frame processing, keep the current content of described application layer buffering area, when newly-generated video code flow, encode with lower picture quality, lower code check or the higher coded system of compression ratio, add again described application layer buffering area;
Described monitoring modular is monitored current network state in the following manner:
If the data volume in the described application layer buffering area surpasses predetermined threshold, then output expression current network transmission state is congested signal, otherwise output expression current network is transmitted as not congested signal.
10. video frequency transmitter in each described wireless network in 9 according to claim 7, it is characterized in that, also comprise the fractionation module, be used for packet to the video code flow of described application layer buffering area and carry out equalization and split, the size of the IP layer maximum path transmission unit that the packet after the fractionation is stipulated less than gateway in the wireless network.
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