CN105763896A - Multi-user dynamic self-adapting video code rate allocation system - Google Patents

Abstract

A multi-user dynamic self-adapting video code rate allocation system is suitable for a wireless network environment and comprises a server, a proxy server-side and a client-side. The proxy server-side includes an MPD file parsing module, an HTTP request analysis module, a client-side code rate decision making module and a code rate allocation module. Firstly the MPD file parsing module obtains corresponding video code rate information from the server-side, calculates an appropriate code rate allocation scheme by combining with user information provided by the HTTP request analysis module and delivers the appropriate code rate allocation scheme to the code rate allocation module for code rate allocation. The multi-user dynamic self-adapting video code rate allocation system utilizes a proxy server to perform grouping, performs the code rate allocation by calculating a Nash equilibrium solution in a dynamic self-adapting mode to achieve efficient multi-user wireless network bandwidth resource sharing, improves wireless network bandwidth utilization rate and overall user video quality experience and reduces the hardware costs while ensuring that each client-side can obtain videos suitable for the self network environment.

Description

A kind of multi-user's dynamic self-adapting video code rate distribution system

Technical field

The present invention relates to a kind of multi-user's dynamic self-adapting video code rate distribution system suitable in wireless network environment, belong to communication technical field.

Background technology

Modern internet video transmission system is tended to realize can the stream media broadcast method of dynamic self-adapting network bandwidth environments, wherein dynamic image expert group (MovingPictureExpertsGroup, MPEG) dynamic self-adapting streaming media standard (DynamicadaptiveStreamingoverHTTP, DASH) based on http protocol that tissue proposes arouses widespread concern and studies.Owing to DASH standard is based on http protocol, so it can be conveniently arranged in existing http server and provide the video resource that can use.The method has two important features: first, and streaming media video is subdivided into the section of certain length, and client realizes the seamless play of video by download and buffer memory video-frequency band successively, and video-frequency band is independent decoding broadcasting.Secondly, the streaming media video of same content has the video version of different code check, and each version ground video quality is different.DASH standard-required client understands the version information of video to determine the video content needing to download by downloading the media description file (MediaPresentationDescription, MPD) defining associated video information in advance.DASH standard allows client with certain rule video-frequency band to DASH server request different quality, is not limiting as the concrete grammar of rule.

More impetus of studying for DASH is in that how single user adapts to the network environment of change at present.But, along with popularizing of public Wi-Fi network, what realize DASH streaming media service in the wireless network becomes a kind of trend, and public wireless network requirement is as much as possible provides the user good Video service, utilizes wireless network bandwidth as much as possible.Although but existing DASH solution has certain adaptive decision-making, can not realize the overall planning of the video network resource of whole Radio Network System, the fairness problem between multi-user is comparatively severe.Existing DASH solution does not have the real solution Multi User Adaptive ground problem that bandwidth is shared in distribution comparatively liberally.

Summary of the invention

For the deficiency of existing DASH technology, the present invention provides a kind of can improve video code rate, reduce the multi-user's dynamic self-adapting video code rate distribution system for wireless network environment that code check change frequency, Data Rate Distribution are more fair.This system relates to the participating user number in radio video streaming media system and estimates and resource allocation problem, it is utilize proxy server to be grouped, and by ask Nash Equilibrium Solution (NashBargainingSolution, NBS) carry out with carrying out dynamic self-adapting Data Rate Distribution realize efficient multi-user wireless network bandwidth resources share.

Multi-user's dynamic self-adapting video code rate distribution system of the present invention, by the following technical solutions:

This system, including server end, proxy server end and client；Proxy server end includes MPD file parsing module, HTTP request analysis module, client code check decision-making module and Data Rate Distribution module；

(1) server end:

1. obtain original video with video capturing device and generate DASH resource (DASH video-frequency band and describe the MPD file of corresponding DASH resource)；

2. in the http server of standard, configure DASH resource concurrence cloth；

(2) proxy server end:

1. MPD file parsing module: be used for the MPD file receiving the associated video that provider server is issued to obtain corresponding video code rate information, and the video information that upgrades in time；

2. HTTP request analysis module: for determining the video content that client asks and the minimum quality asking video, and determine the client terminal quantity participating in bandwidth sharing；These information are supplied to client code check decision-making module and do decision-making use by this module；

3. client code check decision-making module: foundation network total bandwidth and the information obtained from MPD file parsing module and HTTP request analysis module, by asking Nash Equilibrium Solution to calculate the code check of each client；

The code check of each client of described calculating, namely finds the optimal solution shown in below equation (1),

$\begin{array}{c}\max \underset{j=1}{\overset{N}{\Π}}\left(u\right(R_j)-d_j)\\ \begin{array}{cc}s.t.& R_j>R_j^{\min }\\ & R_j\≤R_j^{\max }\\ & \underset{j=1}{\overset{n}{\Σ}}{R}_j\≤R_c\end{array}\end{array}---\left(1\right)$

In formula (1), N represents the participation adaptive number of clients of code check, R_jRepresent the code check of the video of jth client request, u (R_j) represent client video code rate be R_jTime its acquisition video quality, as shown in following formula (2),

u_k(R)=a₁log(a₂R_k+a₃)(2)

Wherein, a₁, a₂, a₃For the video quality coefficient of determination (different types of video, it varies in size), its numerical value can obtain when video is encoded by server end, and records in MPD file；d_jRepresent the minimum video quality that can accept of client；R_cRepresent that total network bandwidth (is labeled as R_c)；By seeking the optimal solution of formula (1), obtain client j and can be obtained with optimal code rates, as shown in formula (3) and (4),

$R_j=({10}^{d_j\mathrm{\λ}}-a_3)/a_2---\left(3\right)$

$log\mathrm{\λ}=R_c-\underset{j=1}{\overset{N}{\Σ}}(a_2{d}_j-a_3)---\left(4\right)$

Finally, encoder bit rate and R are found at DASH server end_jImmediate video-frequency band is as the video code rate of most suitable client j；

The code check of each client is modified by the code check that 4. Data Rate Distribution module provides according to code check decision-making module, it is ensured that the code check that the request code check of each client draws not higher than decision-making, to realize the reasonable distribution to total wireless bandwidth resource；

(3) client:

1. DASH video receiver (supporting webpage and the client of the video service provider issue of MPEG-DASH), in order to DASH video can download broadcasting normally；

2. DASH proxy server information, in order to each client connected is carried out unified management by proxy server.

The present invention is applicable to wireless network environment, it is that one utilizes proxy server to carry out being grouped and pass through to seek Nash Equilibrium Solution (NashBargainingSolution, NBS) carry out Data Rate Distribution with carrying out dynamic self-adapting share to realize efficient multi-user wireless network bandwidth resources, the video quality that can improve wireless network bandwidth utilization rate and overall user while each client of guarantee is obtained in that the video of applicable own net environment is experienced and reduces hardware cost, video code rate is improved, code check change frequency substantially reduces, and Data Rate Distribution is more fair；Simultaneously because only limit the mode of share of bandwidth, it is possible to compatible current existing single user client Adaptable System, it is possible to be widely used in wireless network streaming media Video transmission system.

Accompanying drawing explanation

Fig. 1 is the structure principle chart of multi-user's streaming media video Data Rate Distribution system of the present invention.

Fig. 2 is the deployment diagram of multi-user's streaming media video Data Rate Distribution system of the present invention.

The proxy server end that Fig. 3 is heretofore described realizes module and the operation workflow figure thereof of Data Rate Distribution.

Fig. 4 is the Data Rate Distribution figure not adopting the client of present system (before adopting present system) to receive.

Fig. 5 is the Data Rate Distribution figure adopting the client of present system to receive.

Detailed description of the invention

Multi-user's dynamic self-adapting video code rate distribution system for wireless network environment of the present invention, as it is shown in figure 1, include server end, proxy server end and client.Proxy server end includes MPD file parsing module, HTTP request analysis module, client code check decision-making module and Data Rate Distribution module, first MPD file parsing module obtains the code rate information of corresponding video from server end, and client code check decision-making module calculates suitable Data Rate Distribution scheme by the user profile provided in conjunction with HTTP request analysis module and gives Data Rate Distribution module and carry out Data Rate Distribution.The deployment of multi-user's streaming media video Data Rate Distribution system of the present invention is as shown in Figure 2.

(1) server end

1. original video is obtained and with corresponding DASH video generation tool generation DASH resource (DASH video-frequency band and describe the MPD file of corresponding DASH resource) with corresponding video capturing device.Corresponding DASH video resource needs carry out quality level assessment and provide in MPD file.

2. in the http server of standard, configure corresponding DASH resource concurrence cloth.

(2) proxy server end, as shown in Figure 3:

1. MPD file parsing module: be used for the MPD file receiving the associated video that provider server is issued to obtain corresponding video code rate information, and the video information that upgrades in time；

2. HTTP request analysis module: for determining the video content that client asks and the minimum quality asking video, and determine the client terminal quantity participating in bandwidth sharing；These information are supplied to client code check decision-making module and do decision-making use by this module；

3. client code check decision-making module: foundation network total bandwidth and the information obtained from MPD file parsing module and HTTP request analysis module, by asking Nash Equilibrium Solution to calculate the code check of each client.

Calculate the code check of each client, namely find the optimal solution shown in formula (1),

$\begin{array}{c}\max \underset{j=1}{\overset{N}{\Π}}\left(u\right(R_j)-d_j)\\ \begin{array}{cc}s.t.& R_j>R_j^{\min }\\ & R_j\≤R_j^{\max }\\ & \underset{j=1}{\overset{n}{\Σ}}{R}_j\≤R_c\end{array}\end{array}---\left(1\right)$

In formula (1), N represents the participation adaptive number of clients of code check, R_jRepresent the code check of the video of jth client request, u (R_j) represent client video code rate be R_jTime its acquisition video quality, as shown in formula (2),

u_k(R)=a₁log(a₂R_k+a₃)(2)

Wherein, a₁, a₂, a₃For the video quality coefficient of determination (different types of video, it varies in size), its numerical value can obtain when video is encoded by server end, and records in MPD file；d_jRepresent the minimum video quality that can accept of client；R_cRepresent that total network bandwidth (is labeled as R_c)；By seeking the optimal solution of formula (1), obtain client j and can be obtained with optimal code rates, as shown in formula (3) and (4),

$R_j=({10}^{d_j\mathrm{\λ}}-a_3)/a_2---\left(3\right)$

$log\mathrm{\λ}=R_c-\underset{j=1}{\overset{N}{\Σ}}(a_2{d}_j-a_3)---\left(4\right)$

Finally, encoder bit rate and R are found at DASH server end_jImmediate video-frequency band is as the video code rate of most suitable client j；

The code check of each client is modified by the code check that 4. Data Rate Distribution module provides according to code check decision-making module, it is ensured that the code check that the request code check of each client draws not higher than decision-making, to realize the reasonable distribution to total wireless bandwidth resource；

(3) client:

1. DASH video receiver (supporting webpage and the client of the video service provider issue of MPEG-DASH), in order to DASH video can download broadcasting normally；

2. DASH proxy server information, in order to connected multiple clients are carried out unified management by proxy server.The effect of the present invention can further illustrate by experiment.Fig. 4 show the Data Rate Distribution result not adopting the present invention, and Fig. 5 show the Data Rate Distribution result adopting the present invention.Be can be seen that after have employed the present invention by the contrast of Fig. 4 and Fig. 5, the video code rate that each client obtains is improved, and code check change frequency substantially reduces, and Data Rate Distribution is more fair.

Claims (2)

1. multi-user's dynamic self-adapting video code rate distribution system, is characterized in that: include server end, proxy server end and client；Proxy server end includes MPD file parsing module, HTTP request analysis module, client code check decision-making module and Data Rate Distribution module；

(1) server end:

1. obtain original video with video capturing device and generate DASH resource；

2. in the http server of standard, configure DASH resource concurrence cloth；

(2) proxy server end:

1. MPD file parsing module: be used for the MPD file receiving the associated video that provider server is issued to obtain corresponding video code rate information, and the video information that upgrades in time；

2. HTTP request analysis module: for determining the video content that client asks and the minimum quality asking video, and determine the client terminal quantity participating in bandwidth sharing；These information are supplied to client code check decision-making module and do decision-making use by this module；

3. client code check decision-making module: foundation network total bandwidth and the information obtained from MPD file parsing module and HTTP request analysis module, by asking Nash Equilibrium Solution to calculate the code check of each client；

The code check of each client is modified by the code check that 4. Data Rate Distribution module provides according to code check decision-making module, it is ensured that the code check that the request code check of each client draws not higher than decision-making, to realize the distribution to total wireless bandwidth resource；

(3) client:

1. DASH video receiver, in order to DASH video can download broadcasting normally；

2. DASH proxy server information, in order to each client connected is carried out unified management by proxy server.

2. multi-user's dynamic self-adapting video code rate distribution system according to claim 1, is characterized in that: the code check of each client of described calculating, namely finds the optimal solution shown in below equation (1),

$max\underset{j=1}{\overset{N}{\Π}}\left(u\right(R_j)-d_j)$

$\begin{array}{cc}s.t.& R_j>R_j^{\min }\\ & R_j\≤R_j^{\max }\end{array}---\left(1\right)$

$\underset{j=1}{\overset{N}{\Σ}}{R}_j\≤R_c$

In formula (1), N represents the participation adaptive number of clients of code check, R_jRepresent the code check of the video of jth client request, u (R_j) represent client video code rate be R_jTime its acquisition video quality, as shown in following formula (2),

u_k(R)=a₁log(a₂R_k+a₃)(2)

Wherein, a₁, a₂, a₃For the video quality coefficient of determination, its numerical value obtains when video is encoded by server end, and records in MPD file；d_jRepresent the minimum video quality that can accept of client；R_cRepresent that total network bandwidth (is labeled as R_c)；By seeking the optimal solution of formula (1), obtain client j and can be obtained with optimal code rates, as shown in formula (3) and (4),

$R_j=({10}^{d_j\mathrm{\λ}}-a_3)/a_2---\left(3\right)$

$log\mathrm{\λ}=R_c-\underset{j=1}{\overset{N}{\Σ}}(a_2{d}_j-a_3)---\left(4\right)$

Finally, encoder bit rate and R are found at DASH server end_jImmediate video-frequency band is as the video code rate of most suitable client j.