WO2011079661A1 - Multiple-description-coding distributed media stream distribution system and method - Google Patents
Multiple-description-coding distributed media stream distribution system and method Download PDFInfo
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- WO2011079661A1 WO2011079661A1 PCT/CN2010/078929 CN2010078929W WO2011079661A1 WO 2011079661 A1 WO2011079661 A1 WO 2011079661A1 CN 2010078929 W CN2010078929 W CN 2010078929W WO 2011079661 A1 WO2011079661 A1 WO 2011079661A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
- H04N19/39—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability involving multiple description coding [MDC], i.e. with separate layers being structured as independently decodable descriptions of input picture data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
Definitions
- the present invention relates to a multimedia distributed network real-time video system, including a distributed media stream distribution system with multiple description codes in the fields of mobile streaming media, IPTV live broadcast, and network video surveillance. And method storage and playback system. BACKGROUND OF THE INVENTION With the advancement of FTTH (Fiber To The Home;), EPON (Ethernet Passive Optical Network) technology, fixed-line broadband access bandwidth to IPTV and video surveillance, etc. The business provides objective conditions.
- uplink data rate up to 1.8Mbps; China Unicom's WCDMA (Wide Code D Ivision Multiple Access, Wideband Code Division Multiple Access) With HSDPA support, the downlink data rate is up to 14.4Mbps and the uplink data rate is up to 5.76Mbps.
- WCDMA Wide Code D Ivision Multiple Access, Wideband Code Division Multiple Access
- the improvement of bandwidth does not solve the problem of QoS (Quality of Service) of multimedia video services. Network delay, jitter and packet loss are still problems to be overcome, especially for video. Monitoring such real-time demanding services is more urgent to solve these problems. Multi-description coding is proposed to solve the above-mentioned network problems affecting video services.
- the existing multi-description coding scheme has at least the following disadvantages: Although multi-description coding can improve image quality to a certain extent, since it does not consider the actual network condition, it does not have redundant backup when applied to the carrier level. The ability to cause system reliability is affected.
- an embodiment of the present invention further provides a distributed media stream distribution system with multiple description codes, including: a storage subsystem including a plurality of distributed storage units; a storage scheduling subsystem, configured to Selecting N first distributed storage units from the plurality of distributed storage units, and notifying the multiple description coding subsystem, wherein the N is greater than or equal to 2; the multiple description coding subsystem is configured to perform multiple descriptions on the original video Encoding, forming an N-way multiple description coded code stream, and transmitting the N-way multiple description coded code stream to the N first distributed storage units for storage; a distribution subsystem, connected to the storage subsystem, including a plurality of distributed distribution units; a distribution scheduling subsystem, configured to select M first distributed distribution units from distributed distribution units connected to the first distributed storage unit according to
- the above described multi-description encoded distributed media stream distribution system wherein the N is used by the storage scheduling subsystem according to a first network quality and/or distribution schedule between a storage scheduling subsystem and a multiple description encoding subsystem A second network quality determination between the subsystem and the client.
- the above-described multi-description coded distributed media stream distribution system wherein the N first distributed storage units are the lightest loaded storage units among the plurality of distributed storage units.
- the above-described multi-description coded distributed media stream distribution system wherein the M first distributed distribution units are the lightest distribution of N distributed distribution units connected to the first distributed storage unit unit.
- an embodiment of the present invention further provides a distributed media stream distribution method with multiple description codes, including: a storage scheduling subsystem acquiring N first distributed storage units from the plurality of distributed storage units, And notifying the multi-description coding subsystem, wherein the N is greater than or equal to 2; the multi-description coding subsystem performs multiple description coding on the original video, forms an N-way multi-description encoded code stream, and forms the N-way multi-description encoded code stream.
- the distribution scheduling subsystem selects M first distributed from the distributed distribution unit connected to the first distributed storage unit according to the client request Distributing a unit and notifying a multi-description decoding subsystem disposed on the client, causing the multi-description decoding subsystem to establish a connection with the M first distributed distribution units, and passing the M first distributed distribution units Receiving and decoding a plurality of description codestreams from a portion or all of the first distributed storage unit, the M being less than or equal to N.
- the above described multi-description encoded distributed media stream distribution method wherein the N is used by the storage scheduling subsystem to determine a first network quality and/or distribution schedule between a storage scheduling subsystem and a multiple description encoding subsystem A second network quality determination between the subsystem and the client.
- the multi-description encoded distributed media stream distribution method wherein the N first distributed storage units are the least loaded storage units among the plurality of distributed storage units.
- the above-described multi-description encoded distributed media stream distribution method wherein the M first distributed distribution units are the lightest distribution units of the distributed distribution unit connected to the first distributed storage unit.
- the above described multi-description encoded distributed media stream distribution method wherein the distribution scheduling subsystem selects the first distributions of M from the distributed distribution units connected to the first distributed storage unit according to the client request.
- the distribution unit, and notifying the multi-description decoding subsystem set on the client specifically includes: the distribution scheduling subsystem receiving the client request, and interacting with the storage scheduling subsystem to obtain the first distributed storage unit where the multi-description encoded code stream is located; Distributing the scheduling subsystem to obtain the network quality of the network with the client; the distribution scheduling subsystem determines the value of M according to the acquired network quality; the distribution scheduling subsystem is from the distributed distribution unit connected to the first distributed storage unit The M first distributed distribution units are selected, and the multi-description decoding subsystem set on the client is notified.
- the embodiments of the present invention have the following beneficial effects: Compared with the prior art, the embodiment of the present invention introduces distributed storage of multiple description encoded code streams and distributed distribution of multiple description encoded code streams. Therefore, even if some of the storage units and the distribution unit are in error, the normal operation of the service is not affected, and the reliability of the system is improved.
- the UE when the network condition of the user end is poor (for example, the packet loss rate is relatively serious), the UE establishes a connection with more storage units to obtain more multiple description code streams. Redundant backup is implemented, so that the image that meets the requirement can be decoded.
- FIG. 1 is a structural diagram of a distributed media stream distribution system with multiple description codes according to an embodiment of the present invention
- FIG. 2a to FIG. 2b are schematic diagrams showing a connection manner of a distributed distribution unit and a distributed storage unit
- FIG. 1 is a structural diagram of a distributed media stream distribution system with multiple description codes according to an embodiment of the present invention
- FIG. 2a to FIG. 2b are schematic diagrams showing a connection manner of a distributed distribution unit and a distributed storage unit
- FIG. 1 is a structural diagram of a distributed media stream distribution system with multiple description codes according to an embodiment of the present invention
- FIG. 2a to FIG. 2b are schematic diagrams showing a connection manner of a distributed distribution unit and a distributed storage unit
- the present invention provides a multi-description coded distributed media stream distribution system and method, by providing a plurality of distributed storage units and a plurality of distributed distribution units, between the storage unit and the distribution unit Redundant backup to improve system reliability. As shown in FIG.
- a distributed media stream distribution system with multiple description codes includes: a multi-description coding subsystem; a storage subsystem including a plurality of distributed storage units; and a storage scheduling subsystem for Selecting N first distributed storage units and notifying the multiple description coding subsystem, wherein the N is greater than or equal to 2; the multiple description coding subsystem is configured to perform more on the original video.
- Descriptive coding forming an N-way multiple description coded code stream, and transmitting the N-way multiple description coded code streams to the N first distributed storage units for storage; a distribution subsystem, connected to the storage subsystem, Include a plurality of distributed distribution units; a distribution scheduling subsystem, configured to communicate with the first distributed storage unit according to a client request Selecting M first distributed distribution units from the connected distributed distribution units, and notifying the multi-description decoding subsystem set on the client, so that the multi-description decoding subsystem is established with the M first distributed distribution units And connecting, by the M first distributed distribution units, the reception and decoding of the multi-coded code stream from part or all of the first distributed storage unit, the M being less than or equal to N.
- the N is obtained by the storage scheduling subsystem according to network quality between the storage scheduling subsystem and the multiple description coding subsystem, and the network status between the storage scheduling subsystem and the multiple description coding subsystem.
- the value of N can be set smaller, and the value of N can be set larger when the network condition between the storage scheduling subsystem and the multiple description encoding subsystem is poor.
- the M is obtained by the distribution scheduling subsystem according to the network quality between the distribution scheduling subsystem and the client. When the network status between the distribution scheduling subsystem and the client is good, the value of the M can be set smaller, and when the network condition between the distribution scheduling subsystem and the client is poor, the value of the M can be The settings are larger.
- the above N setting may also consider the network quality acquisition between the distribution scheduling subsystem and the client.
- the value of the N may be set smaller.
- the value of N can be set larger, and the reason for determining the above N and M values is explained as follows.
- the number of M is set to be small, such as 2, it is possible to describe the encoded stream more than 2; * ⁇ cannot be sent to the client normally, the client cannot perform normal decoding, resulting in mosaic or flower show, and If the number of M is set to be large, such as 10, the number of multiple description code streams is normally sent to the client (such as 2), and the client can use the received 2 multiple description code streams for normal decoding. There is no mosaic or flower screen phenomenon, and when the network quality between the distribution scheduling subsystem and the client is good, there is no need to set the number of Ms large, because at this time, all the multiple description code streams are Can be received normally, enough for the client to decode to get a clear image, and more description of the code stream will result in wasted bandwidth.
- how to specifically select the M first distributed distribution units and the N first distributed storage units may be implemented based on multiple manners. Such as: Randomly selecting; or selecting according to load conditions, the N first distributed storage units are the lightest loaded storage units among the plurality of distributed storage units, and the M first distributed distribution units are The distributed distribution unit to which the first distributed storage unit is connected is the lightest distribution unit.
- the load of the distributed storage unit may be described by CPU usage, current storage occupied bandwidth and capabilities, current bandwidth and capabilities consumed by the distribution unit to establish media connections, and the like. Of course, you can also choose in other ways, not here - to give a detailed description.
- N and M need to be obtained according to the network quality between the distribution scheduling subsystem and the client, and the network quality is described according to the following parameters: packet loss rate; and/or delay; and / Or jitter. Its towel: The greater the packet loss rate, the worse the network condition; the larger the delay, the worse the network condition; the larger the jitter, the worse the network condition.
- the parameters describing the network status are not limited to the three parameters listed above, and may also be described by QoS, routing path, etc., and are not enumerated here.
- a storage subsystem includes a plurality of distributed storage units, and a distribution subsystem is coupled to the storage subsystem, including a plurality of distributed distribution units, wherein FIG. 2a-FIG.
- FIG. 2b is a schematic diagram of the connection manner of several possible distributed distribution units and distributed storage units. As shown in FIG. 2a, the distributed distribution unit and the distributed storage unit correspond to each other, and in FIG. 2b, some distributed storage units are connected to one distributed distribution unit, and some distributed storage units and multiple distributed units are distributed. Distribution unit connection. It should be understood that FIG. 2a and FIG. 2b are only an example. In a specific connection manner, only one storage unit needs to be connected to at least one distribution unit, that is, only data in the storage unit needs to be secured. Can be obtained by the distribution unit and sent to the client.
- the distribution scheduling subsystem needs to select M first distributed distribution units from distributed distribution units connected to the first distributed storage unit according to a client request, and Notifying a multi-description decoding subsystem disposed on the client, causing the multi-description decoding subsystem to establish a connection with the M first distributed distribution units, and from the M first distributed distribution units Part or all of a distributed storage unit performs multiple reception and decoding of the encoded code stream, the M being less than or equal to N.
- the distribution scheduling subsystem specifically includes: a media director, configured to receive a client request, and interact with the storage scheduling subsystem to acquire a first distributed storage unit where the multiple description code stream is located a network quality acquisition module, configured to acquire network quality of a network with the client; a quantity determining module, configured to determine a value of M according to the acquired network quality; and a selection module, configured to connect from the first distributed storage unit Selecting M first distributed distribution units in the distributed distribution unit, and notifying the multiple description decoding subsystem set on the client; after receiving the notification, the multiple description decoding subsystem establishes the first distributed with the M And connecting, by the M first distributed distribution units, the reception and decoding of the multi-coded code stream from the part or all of the first distributed storage unit, where the M is less than or equal to N.
- Step 31 The storage scheduling subsystem tests the current network quality of the network between the storage scheduling subsystem and the multiple description encoding subsystem (for example, the current network status can be obtained through a packet loss rate test, a jitter test, a delay test, etc.); 32.
- the storage scheduling subsystem calculates a value of ⁇ according to the test result, and selects one first distributed storage unit from the plurality of distributed storage units, and then notifies the multiple description coding subsystem, and the network quality is better, ⁇ The smaller the value is; step 33, the multiple description coding subsystem performs multiple description coding on the original video to form a multi-description coded code stream, and compresses the multi-description coded code stream of the circuit into a data packet suitable for network transmission; Step 34: The multiple description coding subsystem establishes a connection with the first distributed storage unit, and uses the established connection to send the compressed data packet to the first distributed storage unit for storage. Through the above process, the original video can be split into multiple multi-coded code streams and stored in different distributed storage units.
- the multi-description encoded code stream is saved to the distributed storage unit for transmission to the user.
- the detailed processing flow of the multiple description decoding subsystem, the distribution scheduling subsystem, and the distribution subsystem includes: Step 41, Distribution scheduling The subsystem receives the request sent by the multiple description decoding subsystem; Step 42: The distribution scheduling subsystem interacts with the storage scheduling subsystem to obtain the first distributed storage unit where the multiple description encoded code stream is located; Step 43, the distribution scheduling subsystem test distribution The current network quality of the network between the scheduling subsystem and the multiple description decoding subsystem (that is, the client) (for example, the current network status can be obtained through packet loss rate testing, jitter testing, delay testing, etc.); Step 44, Distribution The scheduling subsystem is configured to determine the value of the network according to the obtained network quality, and select one of the first distributed distribution units from the distributed distribution unit connected to the first distributed storage unit, and notify the plurality of settings provided on the client.
- Step 45 multiple description decoding subsystem and one first distributed distribution unit Connected, and the first distributed distribution unit reads the multi-description encoded code stream from the first distributed storage unit connected thereto, and then sends it to the multi-description decoding subsystem;
- Step 46 The multiple description decoding subsystem performs multiple description decoding on the received multiple description encoded code stream and outputs the result.
- the multiple description decoding subsystem uses a buffer to store the received multiple description encoded code stream, and decodes the multiple description encoded code stream in the buffer every predetermined time (eg, every 5 seconds).
- the multi-description decoding subsystem acquires the quality parameter of the multi-description coded stream, and notifies the distribution scheduling subsystem when the quality parameter of a multi-description code stream is lower than a preset threshold.
- the scheduling subsystem is disconnected by the distribution unit. Therefore, the distribution scheduling subsystem further includes: a control module, configured to disconnect the connection between the third distribution unit and the client, and the multiple description code stream transmitted by the third distribution unit The quality parameter is below the preset threshold.
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Abstract
Disclosed are a multiple-description-coding distributed media stream distribution system and method. The multiple-description-coding distributed media stream distribution system includes: a storage subsystem (103); a storage scheduling subsystem (102), for selecting N first distributed storage units from multiple distributed storage units; a multiple-description-coding subsystem (101), for forming N multiple-description-coding code streams by performing multiple-description-coding for the original video, and respectively transmitting the N multiple-description-coding code streams to the N first distributed storage units to be stored; a distribution subsystem (106) connecting with the storage subsystem and including multiple distributed distribution units; and a distribution scheduling subsystem (107), for selecting, according to a client request, M first distributed distribution units from the distributed distribution units connected with the first distributed storage units, and informing a multiple-description-decoding subsystem (108) set in the client. The present invention improves the system reliability.
Description
多描述编码的分布式媒体流分发系统及方法 技术领域 本发明涉及多媒体分布式网络实时视频系统， 包括移动流媒体、 IPTV实 况转播和网络视频监控等领域的多描述编码的分布式媒体流分发系统及方法 存储和播放系统。 背景技术 随着 FTTH ( (Fiber To The Home, 光纤到家；)、 EPON ( Ethernet Passive Optical Network, 以太网无源光网络） 等技术的 4舞进， 固网宽带接入带宽对 IPTV和视频监控等业务提供了客观的条件。 无线通信技术的发展， 也为多媒体无线应用打破了带宽瓶颈的限制， 尤 其是 3G网络升级到 HSPA ( High Speed Packet Access, 高速分组接入） 阶段 后， 3G网络的传输带宽可以达到几兆 （M ), 可以完全满足某些特殊场景下 高清视频的要求。 目前中国移动的 TD-SCDMA ( Time Division-Synchronous Code Division Multiple Access, 时分同步码分多址）网络， 其 HSDPA ( High Speed Downlink Packet Access, 高速分组接入） 网络支持下行数据速率最高可达 3.6Mbps, 上行数据速度最高可达 384kbps； 中 国 电信的 CDMA2000 EV-DO ( Evolution-Data Only ) 网络的下行数据速率最高可达 3.1Mbps, 上行数据速 率最高可达 1.8Mbps; 中国联通的 WCDMA ( Wide Code Division Multiple Access, 宽带码分多址） 网络在 HSDPA 支持下， 下行数据速率最高可达 14.4Mbps, 上行数据速率最高可达 5.76Mbps。 而另一方面， 由于 H.264等压 缩技术的发展， 高清视频也成为当前的趋势。 但是带宽的提升并没有很好解 决多媒体视频业务的 QoS ( Quality of Service, 服务质量） 问题， 网络延时、 抖动和丢包仍是需要克服的问题， 尤其是对于视频监控这类实时要求很高的 业务更迫切需要解决这些问题。 多描述编码的提出就是为了解决上述网络问题对视频业务造成的影响。 通过将视频源分解为多个独立但具有一定相关性的描述， 通过不同或相同的 路由发送到客户端， 当客户端收到某个描述就可以解码出一定质量的图像，
当收到多个码流的时候， 通过联合解码可以得到更高质量的图像， 从而平滑 了因为丢包而造成图像质量的急剧恶化。 然而现有的多描述编码方案至少存在如下的缺点： 多描述编码虽然在一定程度上能够提高图像质量， 但由于其没有考虑实 际的网络状况， 在应用于电信级层面时， 不具备冗余备份能力， 导致系统的 可靠性受到影响。 发明内容 本发明的目的在于， 提供一种多描述编码的分布式媒体流分发系统及方 法， 提高基于多描述编码的媒体流分发方案的可靠性。 为了实现上述目的， 本发明实施例还提供了一种多描述编码的分布式媒 体流分发系统， 包括： 存储子系统， 包括多个分布式存储单元； 存储调度子系统， 用于从所述多个分布式存储单元中选择 N个第一分布 式存储单元， 并通知所述多描述编码子系统， 所述 N大于或等于 2; 所述多描述编码子系统， 用于对原始视频进行多描述编码， 形成 N路多 描述编码码流，并将所述 N路的多描述编码码流分别发送到所述 N个第一分 布式存储单元进行存储； 分发子系统， 与存储子系统连接， 包括多个分布式分发单元； 分发调度子系统， 用于根据客户端请求， 从与所述第一分布式存储单元 连接的分布式分发单元中选择 M个第一分布式分发单元，并通知设置于客户 端的多描述解码子系统 ,使所述多描述解码子系统建立与所述 M个第一分布 式分发单元的连接，并通过所述 M个第一分布式分发单元从所述第一分布式 存储单元的部分或全部进行多描述编码码流的接收和解码，所述 M小于或等 于 N。 上述的一种多描述编码的分布式媒体流分发系统， 其中， 所述 N由所述 存储调度子系统根据存储调度子系统与多描述编码子系统之间的第一网络质 量和 /或分发调度子系统与客户端之间的第二网络质量确定。
上述的一种多描述编码的分布式媒体流分发系统， 其中， 所述 N个第一 分布式存储单元为所述多个分布式存储单元中负载最轻的存储单元。 上述的一种多描述编码的分布式媒体流分发系统， 其中， 所述 M由所述 分发调度子系统根据分发调度子系统与客户端之间的网络质量确定。 上述的一种多描述编码的分布式媒体流分发系统， 其中， 所述 M个第一 分布式分发单元为与所述第一分布式存储单元连接的 N个分布式分发单元负 载最轻的分发单元。 上述的一种多描述编码的分布式媒体流分发系统， 其中， 所述分发调度 子系统包括： 媒体引向器， 用于接收客户端请求， 并与存储调度子系统交互， 获取多 描述编码码流所在的第一分布式存储单元； 网络质量获取模块， 用于获取与客户端之间的网络的网络质量； 数量确定模块， 用于根据获取的网络质量确定 M的数值； 选择模块， 用于从与第一分布式存储单元连接的分布式分发单元中选择 M个第一分布式分发单元， 并通知设置于客户端的多描述解码子系统。 为了实现上述目的， 本发明实施例还提供了一种多描述编码的分布式媒 体流分发方法， 包括： 存储调度子系统从所述多个分布式存储单元获取 N个第一分布式存储单 元， 并通知多描述编码子系统， 所述 N大于或等于 2; 多描述编码子系统对原始视频进行多描述编码， 形成 N路多描述编码码 流，并将所述 N路的多描述编码码流分别发送到所述 N个第一分布式存储单 元进行存储； 分发调度子系统根据客户端请求， 从与所述第一分布式存储单元连接的 分布式分发单元中选择 M个的第一分布式分发单元，并通知设置于客户端的 多描述解码子系统，使所述多描述解码子系统建立与所述 M个第一分布式分 发单元的连接，并通过所述 M个第一分布式分发单元从所述第一分布式存储 单元的部分或全部进行多描述编码码流的接收和解码，所述 M小于或等于 N。
上述的多描述编码的分布式媒体流分发方法， 其中， 所述 N由所述存储 调度子系统才艮据存储调度子系统与多描述编码子系统之间的第一网络质量和 /或分发调度子系统与客户端之间的第二网络质量确定。 上述的多描述编码的分布式媒体流分发方法， 其中， 所述 N个第一分布 式存储单元为所述多个分布式存储单元中负载最轻的存储单元。 上述的多描述编码的分布式媒体流分发方法， 其中， 所述 M由所述分发 调度子系统根据分发调度子系统与客户端之间的网络质量确定。 上述的多描述编码的分布式媒体流分发方法， 其中， 所述 M个第一分布 式分发单元为与所述第一分布式存储单元连接的分布式分发单元负载最轻的 分发单元。 上述的多描述编码的分布式媒体流分发方法， 其中， 分发调度子系统才艮 据客户端请求， 从与所述第一分布式存储单元连接的分布式分发单元中选择 M个的第一分布式分发单元， 并通知设置于客户端的多描述解码子系统具体 包括： 分发调度子系统接收客户端请求， 并与存储调度子系统交互， 获取多描 述编码码流所在的第一分布式存储单元； 分发调度子系统获取与客户端之间的网络的网络质量； 分发调度子系统才艮据获取的网络质量确定 M的数值； 分发调度子系统从与第一分布式存储单元连接的分布式分发单元中选择 M个第一分布式分发单元， 并通知设置于客户端的多描述解码子系统。 本发明实施例具有如下的有益效果： 与现有技术相比较， 本发明实施例引入了对多描述编码码流的分布式存 储和多描述编码码流的分布式分发。 因此即使部分存储单元和分发单元出错， 也不会影响业务的正常进行， 提高了系统的可靠性。 在本发明的具体实施例中，在用户端网络状况较差（如丢包率比较严重） 时， 用户端会与较多的存储单元建立连接， 以获得较多的多描述编码码流来
实现冗余备份， 以便于能够解码得到满足需求的图像， 因此， 本发明实施例 在丢包差错严重的网络环境下给予视频用户比较理想的下载观看速度， 当用 户网络质量较好时则获得高清晰的网络视频效果， 解决了因网络传输过程中 的视频流数据包丢失而可能导致解码端马赛克或花屏等问题。 附图说明 图 1是本发明实施例的多描述编码的分布式媒体流分发系统的结构图； 图 2a-图 2b为分布式分发单元和分布式存储单元的连接方式示意图； 图 3为本发明实施例中编码端的多描述编码子系统、 存储调度子系统和 存储子系统的详细处理流程示意图； 图 4为本发明实施例中多描述解码子系统、 分发调度子系统和分发子系 统的详细处理 ¾i程示意图。 具体实施方式 本发明提出的一种多描述编码的分布式媒体流分发系统及方法中， 通过 设置多个分布式的存储单元和多个分布式的分发单元， 通过存储单元和分发 单元之间的冗余备份， 提高系统的可靠性。 如图 1所示，本发明实施例的多描述编码的分布式媒体流分发系统包括： 多描述编码子系统； 存储子系统， 包括多个分布式存储单元； 存储调度子系统， 用于从所述多个分布式存储单元中选择 N个第一分布 式存储单元并通知所述多描述编码子系统， 所述 N大于或等于 2; 所述多描述编码子系统， 用于对原始视频进行多描述编码， 形成 N路多 描述编码码流，并将所述 N路的多描述编码码流分别发送到所述 N个第一分 布式存储单元进行存储； 分发子系统， 与存储子系统连接， 包括多个分布式分发单元； 分发调度子系统， 用于根据客户端请求， 从与所述第一分布式存储单元
连接的分布式分发单元中选择 M个的第一分布式分发单元，并通知设置于客 户端的多描述解码子系统 ,使所述多描述解码子系统建立与所述 M个第一分 布式分发单元的连接，并通过所述 M个第一分布式分发单元从所述第一分布 式存储单元的部分或全部进行多描述编码码流的接收和解码，所述 M小于或 等于 N。 本发明实施例中， 所述 N由所述存储调度子系统根据存储调度子系统与 多描述编码子系统之间的网络质量获取， 在存储调度子系统与多描述编码子 系统之间的网络状况较好时， 该 N的数值可以设置的小一些， 而在存储调度 子系统与多描述编码子系统之间的网络状况较差时， 该 N的数值可以设置的 大一些。 本发明实施例中 ,所述 M由所述分发调度子系统才艮据分发调度子系统与 客户端之间的网络质量获取。 在分发调度子系统与客户端之间的网络状况较 好时， 该 M的数值可以设置的小一些， 而在分发调度子系统与客户端之间的 网络状况较差时， 该 M的数值可以设置的大一些。 当然， 上述的 N的设置也可以考虑分发调度子系统与客户端之间的网络 质量获取， 在分发调度子系统与客户端之间的网络状况较好时， 该 N的数值 可以设置的小一些， 而在分发调度子系统与客户端之间的网络状况较差时， 该 N的数值可以设置的大一些， 对上述 N和 M数值确定的理由解释如下。 在分发调度子系统与客户端之间的网络质量较差时， 表明或者丢包率会 比较严重， 或者延时比较大， 数据包无法按时到达（当然， 还可能是其他情 况）， 在上述的情况下， 如果 M的数量设置较小， 如 2 , 则有可能 2个多描述 编码码流; *卩无法正常发送到客户端， 则客户端无法进行正常的解码， 导致马 赛克或花展， 而如果 M的数量设置较大， 如 10 , 则增加了多描述编码码流正 常发送到客户端的数量 （如 2个）， 则客户端能够利用接收到的 2个多描述 编码码流进行正常解码， 不会出现马赛克或花屏的现象， 而在分发调度子系 统与客户端之间的网络质量较好时， 就没有必要将 M的数量设置较大， 因为 此时， 所有的多描述编码码流都能够被正常接收， 足够客户端解码得到清晰 的图像， 再多的多描述编码码流会导致带宽的浪费。 在本发明的具体实施例中， 在确定 N和 M的数值之后， 具体如何选定 该 M个第一分布式分发单元和 N个第一分布式存储单元的选择可以基于多 种方式来实现， 如：
随机选择； 或 根据负载状况选择， 所述 N个第一分布式存储单元为所述多个分布式存 储单元中负载最轻的存储单元，所述 M个第一分布式分发单元为与所述第一 分布式存储单元连接的分布式分发单元负载最轻的分发单元。 在本发明的具体实施例中， 分布式存储单元的负载可以通过 CPU 占用 率、 当前存储已占用的带宽和能力、 当前和分发单元建立媒体连接消耗的带 宽和能力等来描述。 当然， 还可以通过其他方式进行选择， 在此不——列举详细说明。 在本发明的具体实施例中， 需要根据分发调度子系统与客户端之间的网 络质量获取 N和 M, 该网络质量才艮据以下参数描述： 丢包率； 和 /或 延时； 和 /或 抖动。 其巾： 丢包率越大， 网络状况越差； 延时越大， 网络^ I 况越差； 抖动越大， 网络状况越差。 当然，描述网络状况的参数不限于以上列举的 3种参数，还可以通过 Qos、 路由路径等进行描述， 在此不 列举。 在本发明的具体实施例中，在用户端网络状况较差（如丢包率比较严重） 时， 用户端会与较多的存储单元建立连接， 以获得较多的多描述编码码流来 实现冗余备份， 以便于能够解码得到满足需求的图像， 因此， 本发明实施例 在丢包差错严重的网络环境下给予视频用户比较理想的下载观看速度， 当用 户网络质量较好时则获得高清晰的网络视频效果。 在本发明的具体实施例中， 存储子系统， 包括多个分布式存储单元， 而 分发子系统， 与存储子系统连接， 包括多个分布式分发单元， 其中图 2a-图
2b为几种可能的分布式分发单元和分布式存储单元的连接方式示意图。 如图 2a所示， 分布式分发单元和分布式存储单元——对应， 而图 2b中， 有的分布式存储单元与一个分布式分发单元连接， 而有的分布式存储单元与 多个分布式分发单元连接。 应当理解的是， 图 2a和图 2b仅仅是一种举例说明， 在具体的连接方式 中， 只需要保证每一个存储单元与至少一个分发单元连接即可， 也就是只需 要保证存储单元中的数据能够被分发单元获取， 发送到客户端即可。 在本发明的具体实施例中， 分发调度子系统需要用于根据客户端请求， 从与所述第一分布式存储单元连接的分布式分发单元中选择 M 个的第一分 布式分发单元， 并通知设置于客户端的多描述解码子系统， 使所述多描述解 码子系统建立与所述 M个第一分布式分发单元的连接， 并通过所述 M个第 一分布式分发单元从所述第一分布式存储单元的部分或全部进行多描述编码 码流的接收和解码， 所述 M小于或等于 N。 在本发明的具体实施例中， 分发调度子系统具体包括： 媒体引向器， 用于接收客户端请求， 并与存储调度子系统交互， 获取多 描述编码码流所在的第一分布式存储单元； 网络质量获取模块， 用于获取与客户端之间的网络的网络质量； 数量确定模块， 用于根据获取的网络质量确定 M的数值； 选择模块， 用于从与第一分布式存储单元连接的分布式分发单元中选择 M个第一分布式分发单元， 并通知设置于客户端的多描述解码子系统； 多描述解码子系统在接收到通知后，会建立与所述 M个第一分布式分发 单元的连接，并通过所述 M个第一分布式分发单元从所述第一分布式存储单 元的部分或全部进行多描述编码码流的接收和解码， 所述 M小于或等于 N。 当然， 在每个分发单元中可以设置媒体引擎， 用于内存緩冲或存储待发 送到客户端的多描述编码码流。 如图 3所示， 编码端的多描述编码子系统、 存储调度子系统和存储子系 统的详细处理流程包括：
步骤 31 ,存储调度子系统测试存储调度子系统与多描述编码子系统之间 的网络的当前网络质量 （如可以通过丢包率测试、 抖动测试、 延迟测试等方 式来获取当前网络状况）； 步骤 32,存储调度子系统根据测试结果计算 Ν的数值， 并从多个分布式 存储单元中选择 Ν个第一分布式存储单元， 后通知多描述编码子系统， 所述 网络质量越好， Ν的数值越小； 步骤 33 , 多描述编码子系统对原始视频进行多描述编码，形成 Ν路多描 述编码码流，并将所述 Ν路的多描述编码码流压缩成适合网络传输的数据包； 步骤 34, 多描述编码子系统建立与 Ν个第一分布式存储单元之间的连 接，并利用建立的连接将 Ν路压缩后得数据包发送给 Ν个第一分布式存储单 元进行存储。 通过上述的过程， 即可将原始视频拆分成多个多描述编码码流， 并存储 到不同的分布式存储单元中。 而将多描述编码码流保存到分布式存储单元是为了传输到用户， 如图 4 所示， 多描述解码子系统、 分发调度子系统和分发子系统的详细处理流程包 括： 步骤 41 , 分发调度子系统接收多描述解码子系统发送的请求； 步骤 42, 分发调度子系统与存储调度子系统交互， 获取多描述编码码流 所在的第一分布式存储单元； 步骤 43 , 分发调度子系统测试分发调度子系统与多描述解码子系统（也 就是用户端） 之间的网络的当前网络质量 （如可以通过丢包率测试、 抖动测 试、 延迟测试等方式来获取当前网络状况）； 步骤 44, 分发调度子系统用于才艮据获取的网络质量确定 Μ的数值， 并 从与第一分布式存储单元连接的分布式分发单元中选择 Μ 个第一分布式分 发单元， 并通知设置于客户端的多描述解码子系统； 步骤 45 , 多描述解码子系统与 Μ个第一分布式分发单元建立连接， 并 由 Μ 个第一分布式分发单元从与之连接的第一分布式存储单元中读取多描 述编码码流后发送给多描述解码子系统；
步骤 46 , 多描述解码子系统对接收到的多描述编码码流进行多描述解码 后输出。 在本发明的具体实施例中， 所述多描述解码子系统利用緩存来存储接收 到的多描述编码码流， 并每隔预定时间 （如每 5秒） 解码緩存中的多描述编 码码流， 如果当前 5秒内只收到 1个多描述编码码流， 则只对该多描述编码 码流进行解码； 如果当前 5秒内收到至少两个多描述编码码流， 则以合并解 码获得更好的图象质量。 在本发明的具体实施例中， 多描述解码子系统获取多描述编码码流的质 量参数， 在某一个多描述编码码流的质量参数低于预设门限时， 通知分发调 度子系统， 由分发调度子系统通过分发单元断开连接， 因此， 分发调度子系 统还包括： 控制模块， 用于断开第三分发单元与客户端自家的连接， 所述第三分发 单元传输的多描述编码码流的质量参数氐于预设门限。 当然， 上述的断开连接操作也可以由客户端完成。 以上所述仅是本发明的优选实施方式， 应当指出， 对于本技术领域的普 通技术人员来说， 在不脱离本发明原理的前提下， 还可以作出若千改进和润 饰， 这些改进和润饰也应视为本发明的保护范围。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia distributed network real-time video system, including a distributed media stream distribution system with multiple description codes in the fields of mobile streaming media, IPTV live broadcast, and network video surveillance. And method storage and playback system. BACKGROUND OF THE INVENTION With the advancement of FTTH (Fiber To The Home;), EPON (Ethernet Passive Optical Network) technology, fixed-line broadband access bandwidth to IPTV and video surveillance, etc. The business provides objective conditions. The development of wireless communication technology has also broken the limitation of bandwidth bottleneck for multimedia wireless applications, especially after 3G network upgrade to HSPA (High Speed Packet Access) stage, 3G network transmission The bandwidth can reach several megabits (M), which can fully meet the requirements of high-definition video in some special scenarios. At present, China Mobile's TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) network, its HSDPA (High Speed Downlink Packet Access, high-speed packet access) The network supports downlink data rates up to 3.6Mbps and uplink data speeds up to 384kbps. China Telecom's CDMA2000 EV-DO (Evolution-Data Only) network has the highest downlink data rate. Up to 3.1Mbps, uplink data rate up to 1.8Mbps; China Unicom's WCDMA (Wide Code D Ivision Multiple Access, Wideband Code Division Multiple Access) With HSDPA support, the downlink data rate is up to 14.4Mbps and the uplink data rate is up to 5.76Mbps. On the other hand, due to the development of compression technologies such as H.264, HD Video has also become a current trend. However, the improvement of bandwidth does not solve the problem of QoS (Quality of Service) of multimedia video services. Network delay, jitter and packet loss are still problems to be overcome, especially for video. Monitoring such real-time demanding services is more urgent to solve these problems. Multi-description coding is proposed to solve the above-mentioned network problems affecting video services. Decompose the video source into multiple independent but related descriptions. , sent to the client through different or the same route, when the client receives a description, it can decode a certain quality image, When multiple code streams are received, a higher quality image can be obtained by joint decoding, thereby smoothing the sharp deterioration of image quality due to packet loss. However, the existing multi-description coding scheme has at least the following disadvantages: Although multi-description coding can improve image quality to a certain extent, since it does not consider the actual network condition, it does not have redundant backup when applied to the carrier level. The ability to cause system reliability is affected. SUMMARY OF THE INVENTION It is an object of the present invention to provide a distributed media stream distribution system and method for multiple description coding, which improves the reliability of a media stream distribution scheme based on multiple description coding. In order to achieve the above object, an embodiment of the present invention further provides a distributed media stream distribution system with multiple description codes, including: a storage subsystem including a plurality of distributed storage units; a storage scheduling subsystem, configured to Selecting N first distributed storage units from the plurality of distributed storage units, and notifying the multiple description coding subsystem, wherein the N is greater than or equal to 2; the multiple description coding subsystem is configured to perform multiple descriptions on the original video Encoding, forming an N-way multiple description coded code stream, and transmitting the N-way multiple description coded code stream to the N first distributed storage units for storage; a distribution subsystem, connected to the storage subsystem, including a plurality of distributed distribution units; a distribution scheduling subsystem, configured to select M first distributed distribution units from distributed distribution units connected to the first distributed storage unit according to a client request, and notify the setting a multi-description decoding subsystem of the client, the multi-description decoding subsystem establishing a connection with the M first distributed distribution units, and passing the M The first distributed distribution unit performs reception and decoding of the multi-coded code stream from part or all of the first distributed storage unit, the M being less than or equal to N. The above described multi-description encoded distributed media stream distribution system, wherein the N is used by the storage scheduling subsystem according to a first network quality and/or distribution schedule between a storage scheduling subsystem and a multiple description encoding subsystem A second network quality determination between the subsystem and the client. The above-described multi-description coded distributed media stream distribution system, wherein the N first distributed storage units are the lightest loaded storage units among the plurality of distributed storage units. The above described a multi-description coded distributed media stream distribution system, wherein the M is determined by the distribution scheduling subsystem according to a network quality between a distribution scheduling subsystem and a client. The above-described multi-description coded distributed media stream distribution system, wherein the M first distributed distribution units are the lightest distribution of N distributed distribution units connected to the first distributed storage unit unit. The distributed media stream distribution system of the multi-description code described above, wherein the distribution scheduling subsystem comprises: a media director, configured to receive a client request, and interact with the storage scheduling subsystem to obtain a multi-description code a first distributed storage unit in which the flow is located; a network quality acquisition module, configured to acquire network quality of the network with the client; a quantity determining module, configured to determine a value of M according to the acquired network quality; M first distributed distribution units are selected from distributed distribution units connected to the first distributed storage unit, and the multi-description decoding subsystem provided to the client is notified. In order to achieve the above object, an embodiment of the present invention further provides a distributed media stream distribution method with multiple description codes, including: a storage scheduling subsystem acquiring N first distributed storage units from the plurality of distributed storage units, And notifying the multi-description coding subsystem, wherein the N is greater than or equal to 2; the multi-description coding subsystem performs multiple description coding on the original video, forms an N-way multi-description encoded code stream, and forms the N-way multi-description encoded code stream. And respectively sent to the N first distributed storage units for storage; the distribution scheduling subsystem selects M first distributed from the distributed distribution unit connected to the first distributed storage unit according to the client request Distributing a unit and notifying a multi-description decoding subsystem disposed on the client, causing the multi-description decoding subsystem to establish a connection with the M first distributed distribution units, and passing the M first distributed distribution units Receiving and decoding a plurality of description codestreams from a portion or all of the first distributed storage unit, the M being less than or equal to N. The above described multi-description encoded distributed media stream distribution method, wherein the N is used by the storage scheduling subsystem to determine a first network quality and/or distribution schedule between a storage scheduling subsystem and a multiple description encoding subsystem A second network quality determination between the subsystem and the client. The multi-description encoded distributed media stream distribution method, wherein the N first distributed storage units are the least loaded storage units among the plurality of distributed storage units. The above described multi-description encoded distributed media stream distribution method, wherein the M is determined by the distribution scheduling subsystem according to a network quality between a distribution scheduling subsystem and a client. The above-described multi-description encoded distributed media stream distribution method, wherein the M first distributed distribution units are the lightest distribution units of the distributed distribution unit connected to the first distributed storage unit. The above described multi-description encoded distributed media stream distribution method, wherein the distribution scheduling subsystem selects the first distributions of M from the distributed distribution units connected to the first distributed storage unit according to the client request The distribution unit, and notifying the multi-description decoding subsystem set on the client specifically includes: the distribution scheduling subsystem receiving the client request, and interacting with the storage scheduling subsystem to obtain the first distributed storage unit where the multi-description encoded code stream is located; Distributing the scheduling subsystem to obtain the network quality of the network with the client; the distribution scheduling subsystem determines the value of M according to the acquired network quality; the distribution scheduling subsystem is from the distributed distribution unit connected to the first distributed storage unit The M first distributed distribution units are selected, and the multi-description decoding subsystem set on the client is notified. The embodiments of the present invention have the following beneficial effects: Compared with the prior art, the embodiment of the present invention introduces distributed storage of multiple description encoded code streams and distributed distribution of multiple description encoded code streams. Therefore, even if some of the storage units and the distribution unit are in error, the normal operation of the service is not affected, and the reliability of the system is improved. In a specific embodiment of the present invention, when the network condition of the user end is poor (for example, the packet loss rate is relatively serious), the UE establishes a connection with more storage units to obtain more multiple description code streams. Redundant backup is implemented, so that the image that meets the requirement can be decoded. Therefore, the embodiment of the present invention gives the video user an ideal download viewing speed in a network environment with severe packet loss errors, and obtains high when the user network quality is good. The clear network video effect solves the problem that the mosaic of the video stream may be caused by the loss of the video stream during the network transmission. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a structural diagram of a distributed media stream distribution system with multiple description codes according to an embodiment of the present invention; FIG. 2a to FIG. 2b are schematic diagrams showing a connection manner of a distributed distribution unit and a distributed storage unit; Detailed processing flow diagram of the multiple description coding subsystem, the storage scheduling subsystem and the storage subsystem of the coding end in the embodiment; FIG. 4 is a detailed processing of the multiple description decoding subsystem, the distribution scheduling subsystem and the distribution subsystem in the embodiment of the present invention; 3⁄4i schematic diagram. DETAILED DESCRIPTION OF THE INVENTION The present invention provides a multi-description coded distributed media stream distribution system and method, by providing a plurality of distributed storage units and a plurality of distributed distribution units, between the storage unit and the distribution unit Redundant backup to improve system reliability. As shown in FIG. 1, a distributed media stream distribution system with multiple description codes according to an embodiment of the present invention includes: a multi-description coding subsystem; a storage subsystem including a plurality of distributed storage units; and a storage scheduling subsystem for Selecting N first distributed storage units and notifying the multiple description coding subsystem, wherein the N is greater than or equal to 2; the multiple description coding subsystem is configured to perform more on the original video. Descriptive coding, forming an N-way multiple description coded code stream, and transmitting the N-way multiple description coded code streams to the N first distributed storage units for storage; a distribution subsystem, connected to the storage subsystem, Include a plurality of distributed distribution units; a distribution scheduling subsystem, configured to communicate with the first distributed storage unit according to a client request Selecting M first distributed distribution units from the connected distributed distribution units, and notifying the multi-description decoding subsystem set on the client, so that the multi-description decoding subsystem is established with the M first distributed distribution units And connecting, by the M first distributed distribution units, the reception and decoding of the multi-coded code stream from part or all of the first distributed storage unit, the M being less than or equal to N. In the embodiment of the present invention, the N is obtained by the storage scheduling subsystem according to network quality between the storage scheduling subsystem and the multiple description coding subsystem, and the network status between the storage scheduling subsystem and the multiple description coding subsystem. Preferably, the value of N can be set smaller, and the value of N can be set larger when the network condition between the storage scheduling subsystem and the multiple description encoding subsystem is poor. In the embodiment of the present invention, the M is obtained by the distribution scheduling subsystem according to the network quality between the distribution scheduling subsystem and the client. When the network status between the distribution scheduling subsystem and the client is good, the value of the M can be set smaller, and when the network condition between the distribution scheduling subsystem and the client is poor, the value of the M can be The settings are larger. Of course, the above N setting may also consider the network quality acquisition between the distribution scheduling subsystem and the client. When the network status between the distribution scheduling subsystem and the client is good, the value of the N may be set smaller. However, when the network condition between the distribution scheduling subsystem and the client is poor, the value of N can be set larger, and the reason for determining the above N and M values is explained as follows. When the network quality between the distribution scheduling subsystem and the client is poor, it indicates that the packet loss rate will be serious, or the delay is relatively large, and the data packet cannot arrive on time (of course, it may be other cases). In the case, if the number of M is set to be small, such as 2, it is possible to describe the encoded stream more than 2; *卩 cannot be sent to the client normally, the client cannot perform normal decoding, resulting in mosaic or flower show, and If the number of M is set to be large, such as 10, the number of multiple description code streams is normally sent to the client (such as 2), and the client can use the received 2 multiple description code streams for normal decoding. There is no mosaic or flower screen phenomenon, and when the network quality between the distribution scheduling subsystem and the client is good, there is no need to set the number of Ms large, because at this time, all the multiple description code streams are Can be received normally, enough for the client to decode to get a clear image, and more description of the code stream will result in wasted bandwidth. In a specific embodiment of the present invention, after determining the values of N and M, how to specifically select the M first distributed distribution units and the N first distributed storage units may be implemented based on multiple manners. Such as: Randomly selecting; or selecting according to load conditions, the N first distributed storage units are the lightest loaded storage units among the plurality of distributed storage units, and the M first distributed distribution units are The distributed distribution unit to which the first distributed storage unit is connected is the lightest distribution unit. In a particular embodiment of the invention, the load of the distributed storage unit may be described by CPU usage, current storage occupied bandwidth and capabilities, current bandwidth and capabilities consumed by the distribution unit to establish media connections, and the like. Of course, you can also choose in other ways, not here - to give a detailed description. In a specific embodiment of the present invention, N and M need to be obtained according to the network quality between the distribution scheduling subsystem and the client, and the network quality is described according to the following parameters: packet loss rate; and/or delay; and / Or jitter. Its towel: The greater the packet loss rate, the worse the network condition; the larger the delay, the worse the network condition; the larger the jitter, the worse the network condition. Of course, the parameters describing the network status are not limited to the three parameters listed above, and may also be described by QoS, routing path, etc., and are not enumerated here. In a specific embodiment of the present invention, when the network condition of the user end is poor (for example, the packet loss rate is relatively serious), the UE establishes a connection with more storage units to obtain more multiple description code streams to implement. Redundant backup, in order to be able to decode the image that meets the requirements. Therefore, the embodiment of the present invention gives the video user an ideal download viewing speed in a network environment with severe packet loss errors, and obtains high definition when the user network quality is good. Network video effects. In a specific embodiment of the present invention, a storage subsystem includes a plurality of distributed storage units, and a distribution subsystem is coupled to the storage subsystem, including a plurality of distributed distribution units, wherein FIG. 2a-FIG. 2b is a schematic diagram of the connection manner of several possible distributed distribution units and distributed storage units. As shown in FIG. 2a, the distributed distribution unit and the distributed storage unit correspond to each other, and in FIG. 2b, some distributed storage units are connected to one distributed distribution unit, and some distributed storage units and multiple distributed units are distributed. Distribution unit connection. It should be understood that FIG. 2a and FIG. 2b are only an example. In a specific connection manner, only one storage unit needs to be connected to at least one distribution unit, that is, only data in the storage unit needs to be secured. Can be obtained by the distribution unit and sent to the client. In a specific embodiment of the present invention, the distribution scheduling subsystem needs to select M first distributed distribution units from distributed distribution units connected to the first distributed storage unit according to a client request, and Notifying a multi-description decoding subsystem disposed on the client, causing the multi-description decoding subsystem to establish a connection with the M first distributed distribution units, and from the M first distributed distribution units Part or all of a distributed storage unit performs multiple reception and decoding of the encoded code stream, the M being less than or equal to N. In a specific embodiment of the present invention, the distribution scheduling subsystem specifically includes: a media director, configured to receive a client request, and interact with the storage scheduling subsystem to acquire a first distributed storage unit where the multiple description code stream is located a network quality acquisition module, configured to acquire network quality of a network with the client; a quantity determining module, configured to determine a value of M according to the acquired network quality; and a selection module, configured to connect from the first distributed storage unit Selecting M first distributed distribution units in the distributed distribution unit, and notifying the multiple description decoding subsystem set on the client; after receiving the notification, the multiple description decoding subsystem establishes the first distributed with the M And connecting, by the M first distributed distribution units, the reception and decoding of the multi-coded code stream from the part or all of the first distributed storage unit, where the M is less than or equal to N. Of course, a media engine can be set up in each distribution unit for memory buffering or storing multiple description codestreams to be sent to the client. As shown in FIG. 3, the detailed processing flow of the multiple description coding subsystem, the storage scheduling subsystem, and the storage subsystem at the encoding end includes: Step 31: The storage scheduling subsystem tests the current network quality of the network between the storage scheduling subsystem and the multiple description encoding subsystem (for example, the current network status can be obtained through a packet loss rate test, a jitter test, a delay test, etc.); 32. The storage scheduling subsystem calculates a value of Ν according to the test result, and selects one first distributed storage unit from the plurality of distributed storage units, and then notifies the multiple description coding subsystem, and the network quality is better, Ν The smaller the value is; step 33, the multiple description coding subsystem performs multiple description coding on the original video to form a multi-description coded code stream, and compresses the multi-description coded code stream of the circuit into a data packet suitable for network transmission; Step 34: The multiple description coding subsystem establishes a connection with the first distributed storage unit, and uses the established connection to send the compressed data packet to the first distributed storage unit for storage. Through the above process, the original video can be split into multiple multi-coded code streams and stored in different distributed storage units. The multi-description encoded code stream is saved to the distributed storage unit for transmission to the user. As shown in FIG. 4, the detailed processing flow of the multiple description decoding subsystem, the distribution scheduling subsystem, and the distribution subsystem includes: Step 41, Distribution scheduling The subsystem receives the request sent by the multiple description decoding subsystem; Step 42: The distribution scheduling subsystem interacts with the storage scheduling subsystem to obtain the first distributed storage unit where the multiple description encoded code stream is located; Step 43, the distribution scheduling subsystem test distribution The current network quality of the network between the scheduling subsystem and the multiple description decoding subsystem (that is, the client) (for example, the current network status can be obtained through packet loss rate testing, jitter testing, delay testing, etc.); Step 44, Distribution The scheduling subsystem is configured to determine the value of the network according to the obtained network quality, and select one of the first distributed distribution units from the distributed distribution unit connected to the first distributed storage unit, and notify the plurality of settings provided on the client. Describe the decoding subsystem; Step 45, multiple description decoding subsystem and one first distributed distribution unit Connected, and the first distributed distribution unit reads the multi-description encoded code stream from the first distributed storage unit connected thereto, and then sends it to the multi-description decoding subsystem; Step 46: The multiple description decoding subsystem performs multiple description decoding on the received multiple description encoded code stream and outputs the result. In a specific embodiment of the present invention, the multiple description decoding subsystem uses a buffer to store the received multiple description encoded code stream, and decodes the multiple description encoded code stream in the buffer every predetermined time (eg, every 5 seconds). If only one multi-description code stream is received in the current 5 seconds, only the multi-description code stream is decoded; if at least two multi-description code streams are received within 5 seconds, the merge decoding is used to obtain more Good image quality. In a specific embodiment of the present invention, the multi-description decoding subsystem acquires the quality parameter of the multi-description coded stream, and notifies the distribution scheduling subsystem when the quality parameter of a multi-description code stream is lower than a preset threshold. The scheduling subsystem is disconnected by the distribution unit. Therefore, the distribution scheduling subsystem further includes: a control module, configured to disconnect the connection between the third distribution unit and the client, and the multiple description code stream transmitted by the third distribution unit The quality parameter is below the preset threshold. Of course, the above disconnection operation can also be completed by the client. The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make thousands of improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.
Claims
权 利 要 求 书 Claims
1. 多描述编码的分布式媒体流分发系统， 其特征在于， 包括： A multi-description coded distributed media stream distribution system, comprising:
存储子系统， 包括多个分布式存储单元； a storage subsystem comprising a plurality of distributed storage units;
存储调度子系统， 用于从所述多个分布式存储单元中选择 N个第 一分布式存储单元， 所述 N大于或等于 2; a storage scheduling subsystem, configured to select N first distributed storage units from the plurality of distributed storage units, where N is greater than or equal to 2;
多描述编码子系统， 用于对原始视频进行多描述编码， 形成 N路 多描述编码码流， 并将所述 N路多描述编码码流分别发送到所述 N个 第一分布式存储单元进行存储； a multi-description coding subsystem, configured to perform multiple description coding on the original video, form an N-way multiple description coded code stream, and send the N-way multiple description coded code stream to the N first distributed storage units respectively Storage
分发子系统， 与所述存储子系统连接， 包括多个分布式分发单元； 分发调度子系统， 用于根据客户端请求， 从与所述第一分布式存 储单元连接的分布式分发单元中选择 M个第一分布式分发单元， 并通 知设置于客户端的所述多描述解码子系统， 使所述多描述解码子系统 通过建立与所述 M个第一分布式分发单元的连接， 从所述第一分布式 存储单元的部分或全部进行多描述编码码流的接收和解码， 所述 M小 于或等于N。 a distribution subsystem, connected to the storage subsystem, comprising a plurality of distributed distribution units; a distribution scheduling subsystem, configured to select from a distributed distribution unit connected to the first distributed storage unit according to a client request M first distributed distribution units, and notifying the multiple description decoding subsystem provided to the client, by causing the multiple description decoding subsystem to establish a connection with the M first distributed distribution units Part or all of the first distributed storage unit performs multiple reception and decoding of the encoded code stream, the M being less than or equal to N.
2. 根据权利要求 1所述的多描述编码的分布式媒体流分发系统， 其特征 在于， 所述 N由所述存储调度子系统根据所述存储调度子系统与所述 多描述编码子系统之间的第一网络质量和 /或所述分发调度子系统与 所述客户端之间的第二网络质量确定。 2. The multi-description encoded distributed media stream distribution system according to claim 1, wherein said N is stored by said storage scheduling subsystem according to said storage scheduling subsystem and said multi-description coding subsystem A first network quality between the first and/or a second network quality determination between the distribution scheduling subsystem and the client.
3. 根据权利要求 2所述的多描述编码的分布式媒体流分发系统， 其特征 在于， 所述 N个第一分布式存储单元为所述多个分布式存储单元中负 载最轻的存储单元。 3. The multi-description encoded distributed media stream distribution system according to claim 2, wherein the N first distributed storage units are the lightest loaded storage units of the plurality of distributed storage units .
4. 根据权利要求 1所述的多描述编码的分布式媒体流分发系统， 其特征 在于， 所述 M由所述分发调度子系统根据分发调度子系统与客户端之 间的网络质量确定。 4. The multiple description encoded distributed media stream distribution system of claim 1, wherein the M is determined by the distribution scheduling subsystem based on a network quality between a distribution scheduling subsystem and a client.
5. 根据权利要求 4所述的多描述编码的分布式媒体流分发系统， 其特征 在于， 所述 M个第一分布式分发单元为与所述第一分布式存储单元连 接的分布式分发单元负载最轻的分发单元。
5. The multiple description encoded distributed media stream distribution system according to claim 4, wherein the M first distributed distribution units are distributed distribution units connected to the first distributed storage unit. The lightest distribution unit.
6. 根据权利要求 1-5 中任意一项所述的多描述编码的分布式媒体流分发 系统， 其特征在于， 所述分发调度子系统包括： The distributed media stream distribution system according to any one of claims 1 to 5, wherein the distribution scheduling subsystem comprises:
媒体引向器， 用于接收所述客户端请求， 并与所述存储调度子系 统交互， 获取多描述编码码流所在的所述第一分布式存储单元； a media director, configured to receive the client request, and interact with the storage scheduling subsystem to obtain the first distributed storage unit where the multiple description encoded code stream is located;
网络质量获取模块， 用于获取与所述客户端之间的网络的网络质 量； a network quality obtaining module, configured to acquire network quality of a network between the client and the client;
数量确定模块， 用于才艮据获取的所述网络质量确定 M的数值； 选择模块， 用于从与第一分布式存储单元连接的分布式分发单元 中选择 M个第一分布式分发单元， 并通知设置于所述客户端的所述多 描述解码子系统。 a quantity determining module, configured to determine, according to the acquired network quality, a value of M; a selecting module, configured to select M first distributed distribution units from a distributed distribution unit connected to the first distributed storage unit, And notifying the multiple description decoding subsystem set to the client.
7. 一种多描述编码的分布式媒体流分发方法， 其特征在于， 包括： A distributed media stream distribution method with multiple description codes, comprising:
存储调度子系统从所述多个分布式存储单元获取 N个第一分布式 存储单元， 并通知多描述编码子系统， 其中， 所述 N大于或等于 2; 所述多描述编码子系统对原始视频进行多描述编码， 形成 N路多 描述编码码流， 并将所述 N路的多描述编码码流分别发送到所述 N个 第一分布式存储单元进行存储； The storage scheduling subsystem acquires N first distributed storage units from the plurality of distributed storage units, and notifies the multiple description encoding subsystem, wherein the N is greater than or equal to 2; the multiple description encoding subsystem is original Performing multiple description coding on the video, forming an N-way multiple description coded code stream, and transmitting the N-way multiple description coded code streams to the N first distributed storage units for storage;
分发调度子系统根据客户端请求， 从与所述第一分布式存储单元 连接的分布式分发单元中选择 M个第一分布式分发单元， 并通知设置 于客户端的所述多描述解码子系统， 使所述多描述解码子系统通过建 立与所述 M个第一分布式分发单元的连接， 从所述第一分布式存储单 元的部分或全部进行所述多描述编码码流的接收和解码， 所述 M小于 或等于 N。 The distribution scheduling subsystem selects M first distributed distribution units from the distributed distribution unit connected to the first distributed storage unit according to the client request, and notifies the multiple description decoding subsystem set on the client, Having the multi-description decoding subsystem perform reception and decoding of the multi-description encoded code stream from part or all of the first distributed storage unit by establishing a connection with the M first distributed distribution units, The M is less than or equal to N.
8. 根据权利要求 7所述的多描述编码的分布式媒体流分发方法， 其特征 在于， 所述 N由所述存储调度子系统根据存储调度子系统与多描述编 码子系统之间的第一网络质量和 /或分发调度子系统与客户端之间的 第二网络质量确定。 8. The multi-description encoded distributed media stream distribution method according to claim 7, wherein the N is determined by the storage scheduling subsystem according to a first between a storage scheduling subsystem and a multi-description encoding subsystem. A second network quality determination between the network quality and/or distribution scheduling subsystem and the client.
9. 根据权利要求 8所述的多描述编码的分布式媒体流分发方法， 其特征 在于， 所述 N个第一分布式存储单元为所述多个分布式存储单元中负 载最轻的存储单元。 根据权利要求 7所述的多描述编码的分布式媒体流分发方法， 其特征
在于， 所述 Μ由所述分发调度子系统根据分发调度子系统与客户端之 间的网络质量确定。 The distributed media stream distribution method according to claim 8, wherein the N first distributed storage units are the lightest loaded storage units of the plurality of distributed storage units . A multi-description encoded distributed media stream distribution method according to claim 7, characterized by The Μ is determined by the distribution scheduling subsystem based on the network quality between the distribution scheduling subsystem and the client.
11. 根据权利要求 10所述的多描述编码的分布式媒体流分发方法，其特征 在于， 所述 Μ个第一分布式分发单元为与所述第一分布式存储单元连 接的分布式分发单元负载最轻的分发单元。 The distributed media stream distribution method according to claim 10, wherein the first distributed distribution unit is a distributed distribution unit connected to the first distributed storage unit The lightest distribution unit.
12. 根据权利要求 10所述的多描述编码的分布式媒体流分发方法，其特征 在于， 分发调度子系统根据客户端请求， 从与所述第一分布式存储单 元连接的分布式分发单元中选择 Μ个的第一分布式分发单元， 并通知 设置于所述客户端的所述多描述解码子系统包括： 12. The multi-description encoded distributed media stream distribution method according to claim 10, wherein the distribution scheduling subsystem is configured from the distributed distribution unit connected to the first distributed storage unit according to a client request. Selecting a first distributed distribution unit, and notifying the multiple description decoding subsystem set to the client includes:
所述分发调度子系统接收客户端请求， 并与所述存储调度子系统 交互， 获取所述多描述编码码流所在的第一分布式存储单元； Receiving, by the distribution scheduling subsystem, a client request, and interacting with the storage scheduling subsystem to acquire a first distributed storage unit where the multiple description encoded code stream is located;
分发调度子系统获取与所述客户端之间的网络的网络质量； 分发调度子系统才艮据获取的所述网络质量确定 Μ的数值； 分发调度子系统从与第一分布式存储单元连接的分布式分发单元 中选择 Μ个第一分布式分发单元， 并通知设置于所述客户端的所述多 描述解码子系统。
Distributing a scheduling subsystem to obtain network quality of a network with the client; the distribution scheduling subsystem determines a value of the network based on the obtained network quality; and the distribution scheduling subsystem is connected from the first distributed storage unit One of the first distributed distribution units is selected in the distributed distribution unit, and the multiple description decoding subsystem provided to the client is notified.
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| CN1126344C (en) * | 1997-10-30 | 2003-10-29 | 松下电器产业株式会社 | Distributed internet protocol-based real-time multimedia streaming architecture |
| CN101175216A (en) * | 2007-10-17 | 2008-05-07 | 南京大学 | Mixed video fault tolerance method based on multiple description encoding and error hiding |
| CN101340261A (en) * | 2007-07-05 | 2009-01-07 | 华为技术有限公司 | Multiple description encoding, method, apparatus and system for multiple description encoding |
| WO2009135630A2 (en) * | 2008-05-05 | 2009-11-12 | B-Virtual Nv | Method of storing a data set in a distributed storage system, distributed storage system and computer program product for use with said method |
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| CN1126344C (en) * | 1997-10-30 | 2003-10-29 | 松下电器产业株式会社 | Distributed internet protocol-based real-time multimedia streaming architecture |
| CN101340261A (en) * | 2007-07-05 | 2009-01-07 | 华为技术有限公司 | Multiple description encoding, method, apparatus and system for multiple description encoding |
| CN101175216A (en) * | 2007-10-17 | 2008-05-07 | 南京大学 | Mixed video fault tolerance method based on multiple description encoding and error hiding |
| WO2009135630A2 (en) * | 2008-05-05 | 2009-11-12 | B-Virtual Nv | Method of storing a data set in a distributed storage system, distributed storage system and computer program product for use with said method |
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