WO2011038694A1 - 视频数据传输处理、发送处理方法、装置和网络系统 - Google Patents

视频数据传输处理、发送处理方法、装置和网络系统 Download PDF

Info

Publication number
WO2011038694A1
WO2011038694A1 PCT/CN2010/077526 CN2010077526W WO2011038694A1 WO 2011038694 A1 WO2011038694 A1 WO 2011038694A1 CN 2010077526 W CN2010077526 W CN 2010077526W WO 2011038694 A1 WO2011038694 A1 WO 2011038694A1
Authority
WO
WIPO (PCT)
Prior art keywords
fault
tolerant
packet loss
source
data
Prior art date
Application number
PCT/CN2010/077526
Other languages
English (en)
French (fr)
Inventor
张冬
郭宜
李厚强
沈秋
胡昌启
谢清鹏
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP10819923.3A priority Critical patent/EP2472873B8/en
Publication of WO2011038694A1 publication Critical patent/WO2011038694A1/zh
Priority to US13/434,400 priority patent/US9215498B2/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382Demodulation or channel decoding, e.g. QPSK demodulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/007Unequal error protection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146Data rate or code amount at the encoder output
    • H04N19/147Data rate or code amount at the encoder output according to rate distortion criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/164Feedback from the receiver or from the transmission channel
    • H04N19/166Feedback from the receiver or from the transmission channel concerning the amount of transmission errors, e.g. bit error rate [BER]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/40Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46Embedding additional information in the video signal during the compression process
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383Channel coding or modulation of digital bit-stream, e.g. QPSK modulation

Definitions

  • Video data transmission processing, transmission processing method, device and network system The application is submitted to the Chinese Patent Office on September 30, 2009, and the application number is 200910179726.5, and the invention name is "video data transmission processing, transmission processing method, device and network system". The priority of the Chinese Patent Application No. 5, the entire contents of which is incorporated herein by reference. Technical field
  • Embodiments of the present invention relate to the field of video data transmission technologies, and in particular, to a video data transmission processing, a transmission processing method, a device, and a network system.
  • the L5 Media Gateway extracts and sends the video substreams required by other networks.
  • network transmission delays and packet loss can cause video packets to become unusable, resulting in a severe degradation in decoded video quality.
  • wired networks have a lower packet loss rate and a higher transmission rate
  • wireless networks such as WLAN, 3G through GPRS, GPRS, etc.
  • the data loss rate of the wired network is low, and the packet loss is mainly caused by the congestion of the router in the network; in the wireless network, the limited band
  • the existing error control technology includes fault-tolerant transcoding, which provides a code stream suitable for a wired network in a video server, and then adds a transcoder at a network boundary point to provide a suitable code network for the video code stream. Redundant.
  • the video agent is used as a transcoder to decode and re-encode the original stream, which increases the complexity of the transcoder and increases the system delay.
  • Existing error control techniques also include redundant frame coding, the purpose of which is to protect a series of compressed images with redundant information, to have error resilience or to reduce the impact of communication errors. However, this method generates redundant frames when the packet loss rate is respectively given, possibly
  • the error probability of the previous channel is lower than that of the latter channel, but in order to make the second data forwarding node
  • the video server adds more redundancy in the code stream, resulting in wasted bandwidth in the channel from the video server to the first data forwarding node.
  • the embodiments of the present invention provide a video data transmission processing, a transmission processing method, a device, and a network system, so as to improve fault tolerance of a code stream in different network packet loss rate environments.
  • the embodiment of the invention provides a video data transmission processing method, including:
  • An embodiment of the present invention provides a video data transmission processing method, including:
  • An embodiment of the present invention provides a data forwarding node device, including:
  • a first receiving module configured to receive a source stream sent from the source transport network to the target transport network
  • an encoding processing module configured to: according to the respective packet loss rate of the source transport network and the target transport network, and the Fault-tolerant auxiliary information corresponding to the source stream, performing fault-tolerant encoding processing on the source stream to obtain a fault-tolerant code stream
  • a network device including:
  • a first obtaining module configured to obtain fault-tolerant assistance corresponding to the source stream according to a packet loss rate corresponding to at least two transmission networks in the number of L5 transmission network systems before sending the source stream to the data transmission network system
  • the fault-tolerant auxiliary information is used to provide a reference for the data forwarding node in the data transmission network system to perform fault-tolerant encoding processing on the received code stream to obtain a fault-tolerant code stream;
  • a second sending module configured to send the fault tolerant auxiliary information to the data forwarding node.
  • the embodiment of the invention provides a network system, including:
  • a data forwarding node device configured to receive a source stream from the source transport network to the target transport network, according to a respective packet loss rate of the source transport network and the target transport network, and a fault tolerance corresponding to the source stream Auxiliary information, performing fault-tolerant coding processing on the source stream to obtain a fault-tolerant code stream, Transmitting, by the target transmission network, the acquired fault-tolerant code stream;
  • a network device configured to acquire fault-tolerant auxiliary information corresponding to the source stream according to a packet loss rate corresponding to at least two transmission networks in the data transmission network system, before sending the source stream to the data transmission network system,
  • the data forwarding node device sends the fault-tolerant auxiliary information; the fault-tolerant auxiliary information is used for performing fault-tolerant encoding processing on the received code stream for the data forwarding node device in the data transmission network system to obtain a fault-tolerant code stream. for reference.
  • the data server can obtain the packet loss rate corresponding to the code stream to be sent according to the packet loss rate corresponding to the at least two transmission networks in the data transmission network system.
  • the fault-tolerant auxiliary information enables the data forwarding node to quickly generate a fault-tolerant code stream that conforms to the packet loss characteristics of the subsequent transmission network according to the packet loss rate of the L0 transmission network, and can improve the error rate of different network packet loss environments.
  • FIG. 1 is a schematic diagram of a method for extracting and using fault-tolerant auxiliary information according to an embodiment of the present invention
  • FIG. 2 is a flowchart of an embodiment of a data transmission processing method according to the present invention
  • FIG. 3 is a flowchart of an embodiment of a data transmission processing method according to the present invention.
  • FIG. 4 is a schematic diagram of an application scenario in which a packet loss rate is increased during a video transmission process according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of an application scenario in which a packet loss rate is reduced during video transmission according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a method for adding redundant force to a port at a rate of 5% at a packet loss rate according to an embodiment of the method of the present invention.
  • FIG. 8 is a schematic diagram of redundantly adding potential energy at a 10% packet loss rate according to an embodiment of the method of the present invention
  • FIG. 9 is a schematic diagram of a method for adding redundancy to a port at a 20% packet loss rate according to an embodiment of the method of the present invention
  • FIG. Embodiments of the forward error correction description information are used for FEC redundancy allocation diagram
  • FIG. 11 is a schematic structural diagram of an embodiment of a data forwarding node device according to the present invention.
  • Embodiment 1 of a network device according to the present invention.
  • FIG. 13 is a schematic structural diagram of Embodiment 2 of a network device according to the present invention.
  • FIG. 14 is a schematic structural diagram of an embodiment of a network system according to the present invention.
  • FIG. 1 is a fault-tolerant auxiliary information according to an embodiment of the present invention.
  • the information is defined as fault-tolerant auxiliary information; the fault-tolerant auxiliary information may be embedded in the code stream or transmitted to each data forwarding node through other means; then, considering the network change during the transmission process, the data forwarding node according to the follow-up
  • the packet loss rate of the network uses the fault-tolerant auxiliary information to quickly generate a fault-tolerant code stream that conforms to the packet loss characteristics of the subsequent network.
  • the data forwarding node can perform fast transcoding according to the auxiliary information and the corresponding packet loss rate, so that not only can the full
  • the data forwarding node can be a stream server, a media gateway, a router, etc.; the fault-tolerant auxiliary information can be used for redundant frame addition of the code stream, and FEC, and the like.
  • Step 100 Before sending, by a data server, a source code stream to a data transmission network system,
  • the data transmission network system described in this embodiment includes a data server for providing a data source, and further includes a plurality of data forwarding nodes and user equipment terminals for transferring the transmitted data, a data server, a data forwarding node, and a terminal.
  • the devices are connected through various transmission networks, and the transmission network is
  • Data transfer provides a channel.
  • the data server for example, the video server
  • the data server ensures that the transmitted video code stream can adapt to the network packet loss characteristics of different transmission networks, and ensures data transmission.
  • video service Before transmitting the video code stream to a data forwarding node in the data transmission network system, the fault-tolerant auxiliary information corresponding to the sent source stream is obtained, and the fault-tolerant auxiliary information includes at least two transmissions in the data transmission network system.
  • the network for example, the description information of the fault-tolerant data set corresponding to the respective packet loss rates of the source transport network and the target transport network, the fault-tolerant data set is used to identify the fault-tolerant data that needs to be adjusted in the source stream, and each fault-tolerant data set represented by the information is described.
  • the fault-tolerant data set corresponding to the low packet loss rate is a subset of the fault-tolerant data set corresponding to the high packet loss rate.
  • the fault-tolerant auxiliary information is used for providing a reference for the data forwarding node in the data transmission network system to perform fault-tolerant coding processing on the received code stream, and obtaining a fault-tolerant code stream corresponding to a subsequent packet loss rate of the transmission network, that is, data forwarding.
  • the node can perform packet loss rate on the subsequent transmission network of the data forwarding node according to the fault tolerance auxiliary information.
  • the video server generates fault-tolerant auxiliary information according to the packet loss rate corresponding to at least two transmission networks in the data transmission network system, that is, the information described by the fault-tolerant auxiliary information can be adapted to the transmission network with different packet loss rate, and the data.
  • the forwarding node After receiving the code stream L5 sent by the previous transmission network, the forwarding node can find out the fault-tolerant operation rules corresponding to the two packet loss rates of the upper and lower transmission networks with the assistance of the fault-tolerant auxiliary information, and perform fault-tolerant according to the indication. Transcoding forms a fault tolerant code stream.
  • the data server may be a video server, a video on demand server, or the like.
  • Step 101 The data server sends the fault tolerant auxiliary information to the data forwarding node. >0 After obtaining the fault-tolerant auxiliary information corresponding to the video stream to be sent, the data server sends the fault-tolerant auxiliary information to each data forwarding node in the data transmission network system for fault-tolerant coding of the data forwarding node. Before the data server sends the video data to the data forwarding node connected to it, in order to adapt to the packet loss rate of the transmission network between the data forwarding nodes, the source stream should be fault-tolerantly encoded, of course, combined with the previously obtained fault-tolerant assistance. Information to generate. The data server generates a fault-tolerant code corresponding to the source stream according to the packet loss rate and the fault-tolerant auxiliary information corresponding to the transmission network with the data forwarding node.
  • the fault-tolerant code stream and the fault-tolerant auxiliary information can be sent to the data forwarding node.
  • the fault-tolerant code stream and the fault-tolerant auxiliary information can also be sent separately.
  • the data server acquires the fault-tolerant auxiliary information corresponding to the code stream to be sent according to the packet loss rate corresponding to the at least two transmission networks in the data transmission network system, and sends the fault-tolerant auxiliary information.
  • the data forwarding node so that the data forwarding node can
  • L0 is the same as the packet loss rate of the transmission network, and the fault-tolerant auxiliary information is used to quickly generate a fault-tolerant code stream that conforms to the packet loss characteristics of the subsequent transmission network, which not only improves the fault tolerance of the code stream in different network packet loss rate environments, but also has less delay and operation. Low complexity is beneficial for real-time applications.
  • Step 200 Receive a source code stream sent from a source transmission network to a target transmission network;
  • L5 obtains fault-tolerant auxiliary information corresponding to the source stream according to the packet loss rate of at least two transmission networks in the data transmission network system, for example, the source transmission network of the data forwarding node and the target transmission network, and the fault tolerance is obtained.
  • the data forwarding node receives the fault-tolerant auxiliary information.
  • the source transmission network and the target transmission network involved in this embodiment refer to a transmission network at both ends of the data forwarding node in terms of the flow of data.
  • the source stream received by the data forwarding node can be
  • >0 is sent by the data server, or it can be sent by other data forwarding nodes.
  • the data server sends the source stream to the terminal device through the data forwarding node.
  • the transmission network between the data server and the data forwarding node may be referred to as a source transmission network, and the data forwarding node and The transmission network between terminal devices is called the target transmission network, that is to say, the source stream sent by the data server is sent to the target transmission network through the source transmission network.
  • Step 201 Perform fault-tolerant coding processing on the source stream according to a packet loss ratio of the source transport network and the target transport network, and fault-tolerant auxiliary information corresponding to the source stream, to obtain a fault-tolerant code stream.
  • the data forwarding node may receive the packet loss according to the source transmission network and the target transmission network after receiving the source stream sent by the data server. Rate, combined with fault-tolerant auxiliary information, quickly transcode the source stream, and use the fault-tolerant auxiliary information to quickly generate fault tolerance that conforms to subsequent network packet loss characteristics.
  • the fault-tolerant coding process should be different from the video coding process.
  • the fault-tolerant coding is a relatively complex fault-tolerant operation, which can be a direct code stream copy or a partial coding process.
  • Step 202 Send the acquired fault-tolerant code stream to the target transmission network.
  • the L5 data forwarding node After obtaining the fault-tolerant code stream suitable for the subsequent transmission network, the L5 data forwarding node sends the fault-tolerant code stream to the terminal device or other data forwarding node through the target transmission network.
  • the data forwarding section can also forward fault-tolerant assistance information along with the fault-tolerant code stream or separately to other data forwarding sections.
  • the data forwarding node can perform fault tolerance coding on the code stream that needs to be forwarded according to the fault-tolerant auxiliary information corresponding to the data code stream sent by the data server.
  • the fault-tolerant code stream is adapted to the network characteristics of the subsequent transmission network packet loss rate.
  • the network resources can be fully and reasonably utilized, and each time a change is experienced, the response can be quickly reacted, and the fault tolerance of the code stream can be changed according to actual conditions.
  • the fault-tolerant auxiliary information involved in the foregoing embodiments may be applicable to various application environments. Application examples of applying adaptive fault-tolerant auxiliary information for adaptive redundant frame adjustment and FEC protection are respectively given below.
  • the data server acquires the received code stream from the data forwarding node according to the packet loss rate corresponding to at least two transmission networks in the data transmission network system.
  • the fault-tolerant auxiliary information includes a packet loss rate of each of the at least two transmission networks in the data transmission network system Descriptive information of the corresponding redundant frame set, where the redundant frame set is used to identify a data frame in the plurality of data frames in the code stream that needs to generate a redundant frame, and each redundant frame represented by the description information The set satisfies the following conditions: the redundant frame set corresponding to the low packet loss rate is the redundancy corresponding to the high packet loss rate
  • the redundant frame set is an example of the fault-tolerant data set described in the foregoing embodiment.
  • the data forwarding node may perform, according to the respective packet loss rate of the source transmission network and the target transmission network, and the fault-tolerant auxiliary information corresponding to the source stream, the multiple data frames included in the received source stream. Adaptive redundant frame adjustment to obtain a fault-tolerant code stream that meets the packet loss rate of the target transmission network.
  • the fault-tolerant auxiliary information can be applied to the adaptive redundant frame of the code stream.
  • the specific implementation steps are as follows: First, the overall distortion of the source channel is estimated during the encoding process of the data server, and different packet loss is extracted. Redundant description information of each frame under the premise; secondly, these very small pieces of information are added to the code stream for transmission or separately to the data forwarding node; then, the data forwarding node can refer to different pairs according to the redundant description information.
  • the packet rate is adaptively added or deleted.
  • the above redundant description information is an example of fault-tolerant auxiliary information, and the extraction process includes: First, for two packet loss rates of at least two transmission networks, respectively, no redundant frames are generated and redundant frames are generated. In the case, calculating two sets of source channel distortion information corresponding to each data frame in the code stream; Applying the rate-distortion model, whether the data frame corresponding to the two sets of source channel distortion information obtained by the calculation needs to generate a redundant frame under the corresponding packet loss rate condition, and obtains the judgment result, that is, the utilization distortion
  • the model selects the best performing redundant frame generation method for different d-packet rates. Finally, according to the judgment knot
  • the description information of the redundant frame set corresponding to each packet loss rate is obtained by using a reasonable formula and organization. The details are described below.
  • the distortion of the source channel is estimated by an improved Rrcursive Optimal Per-pixel Estimate (RORE) algorithm. It is assumed that the code stream of a video frame is encapsulated in one data packet during transmission. Therefore, in the case where the current packet loss rate is p, the probability of loss for each video frame is also p. If the value of the ith pixel in the nth frame of the original video sequence is its coded end reconstruction value, and the decoding end reconstruction value is the source channel total distortion can be expressed as the mean square error of the sum. Since the exact reconstruction value of the decoding end after the code stream is not transmitted through the error channel is obtained at the encoding end, it can be regarded as a random signal under an error channel, and the overall distortion of the source channel becomes: _ 1
  • equation (1) indicates that the signal source is out of order
  • equation (2) indicates channel distortion
  • equation (2) gives the source channel Another way to represent the overall distortion, you can see that estimating the overall distortion of the source channel is to estimate
  • Embodiments of the present invention provide a method for estimating the first moment and the second moment based on a pixel, ROPE. Assuming that the error concealment method used by the decoder is FC, the first and second moments can be calculated according to the pixel coding mode in a recursive manner:
  • Intra prediction encodes pixels in the block:
  • Inter prediction (Inter prediction; the following cartridge: Inter) encodes the pixels in the block:
  • the present embodiment proposes the following recursion formula in consideration of the combination of these modes. :
  • the pixels in the redundant frame are in the Intra block, and the pixels of the current frame are in the Inter block.
  • ⁇ ⁇ (1- ⁇ )( + ⁇ ⁇ ) + ⁇ (1- P ) + P 3 ⁇ 4 ⁇ 3 ⁇ 4—
  • the pixel i of the Inter block refers to the pixel j in the previous frame (reference frame), and the prediction error is quantized as ⁇ in the redundant frame, the pixel i of the Inter block refers to the pixel j r in the previous frame (reference frame) , prediction error e; Quantify as.
  • Dl is the total distortion of the frame source channel when there is no redundant frame calculated by formula (3) - formula (6) and formula (15); D 2 is using equation (7) - formula (14) and formula ( 15) Calculate the overall distortion of the frame source channel when there is a redundant frame.
  • the cost function value of model is greater than the cost function value of mode2, a redundant frame can be allocated for the current frame.
  • the data forwarding node may perform adaptive frame adjustment on multiple data frames included in the source stream according to respective packet loss rates of the source transport network and the target transport network, and fault-tolerant auxiliary information corresponding to the source stream.
  • the first packet loss rate corresponding to the source transmission network is smaller than the second packet loss rate corresponding to the target transmission network
  • a redundant frame in which the second redundant frame set is larger than the first redundant frame set is added.
  • 4 is a schematic diagram of an application scenario in which a packet loss rate is increased during video transmission according to an embodiment of the present invention. As shown in FIG. 4, a video server generates a low redundancy code stream (3%) that meets the current packet loss rate and redundancy. Descriptive information, while at the data forwarding node
  • the higher packet loss rate for the backend (for example, 5%, 20%).
  • the current packet loss rate (5%, 20%) needs to be redundant but not redundant.
  • the remaining frames are then added with redundant frames by operations such as copying frames or generating different quality copies. This operation is low in complexity and can be guaranteed The efficiency of the entire system is optimized and the quality of the transmitted video can be improved.
  • FIG. 5 is a schematic diagram of an application scenario in which a packet loss rate is reduced during video transmission according to an embodiment of the present invention. As shown in FIG. 5, the video server generates a corresponding code stream and a redundant description when the highest packet loss rate (20%) is generated. information.
  • the corresponding redundant frame can be discarded from the code stream according to the packet loss rate.
  • the first transcoder ie, the data forwarding node
  • the second transcoder transmits the high redundancy code stream directly or
  • the code stream that becomes the next highest redundancy (the packet loss rate is 10%) is transmitted to the base station
  • the third transcoder converts the high redundancy code stream into a lower redundant code stream (the packet loss rate is 5%) and transmits it to the wireless node.
  • the code stream of the maximum redundancy rate is stored in the video server, since it is not necessary to re-encode to generate redundant frames, flexible error resilience can be provided, which is advantageous for the efficiency of the entire system.
  • the embodiment of the invention adopts a pixel-based distortion estimation algorithm, can accurately perform adaptive redundant frame allocation, and then adds scalability constraints, and can generate a redundancy with error elastic scalability. Further, a very small number of bits (for example, 3 bits) are used for each frame to record the redundant description information, and the redundant description information may be added to the data of each frame or to an image group. (Group Of Pictures; the following is called: GOP) or a video is described in a unified manner, and the description information is attached to the head end of the GOP or the head end of the video, so that when applied to different packet loss ratios, the whole transmission The bandwidth efficiency of the transmission system is the highest.
  • GOP Group Of Pictures
  • the following embodiment is tested for the application of the increase in packet loss rate in the above embodiment.
  • one frame is one packet; multiple decoding: at different packet loss rates, the packet loss file is randomly offset, and the peak signal to noise ratio is obtained three times (Peak Signal-to-Noise Ratio)
  • PSNR Peak Signal-to-Noise Ratio
  • the code stream generated by the above different quantization parameter QP can obtain a L0 rate distortion (Rate-Distortion; hereinafter referred to as: RD) curve through a certain packet loss rate, and the first four QP points are used, which are provided by the embodiment of the present invention.
  • RD L0 rate distortion
  • the method calculates the average PSNR difference between the two curves.
  • a redundant frame corresponding to the packet loss rate is added in the code stream without redundancy in accordance with the algorithm of the above embodiment.
  • Table 1 shows the performance improvement of the code stream with respect to the code stream without adding redundant frames at the packet loss rate.
  • the 0% vs X% line shows the code stream with redundant frames generated under X% packet loss rate and none.
  • the performance of the code stream L5 of the redundant frame at the X% packet loss rate is improved. For example, if the channel packet loss rate is 3%, if the redundancy is added according to the added redundant frame mode corresponding to the 3% packet loss rate in the redundant frame auxiliary information, the performance is 0.84 dB better than the non-addition of the redundant frame.
  • the 5% vsl0% line shows that at 10% of the channel packet loss rate, if redundant description information is used to add redundancy to generate a code stream that meets the 10% packet loss rate, the performance is 5% lower than the direct transmission rate.
  • the generated code stream is increased by 1.05 dB.
  • the higher the channel packet loss rate the more obvious the performance improvement.
  • the objective quality improvement close to ldB can be obtained; for the high packet loss rate (20%), nearly 0.7 dB can be obtained.
  • Objective quality improvement The experimental results show that the redundant frame set with different packet loss rate generated by the algorithm has scalability, that is, the redundant frame can be quickly adaptively added according to the corresponding packet loss rate to improve the decoding quality.
  • Table 3 shows the performance comparison of fault-tolerant protection with redundant description information for fault-tolerant protection and adaptive intra-frame refresh.
  • each row represents a comparison of the decoding performance of the code stream using the two methods for fault tolerance protection at various packet loss rates. Under the low packet loss rate, the performance of the algorithm in this embodiment is slightly lower. Down, but at high packet loss rates, the performance of the algorithm in this embodiment is improved.
  • intra-frame refresh transcoding is a cascading decoding and encoding operation in the transcoder, the complexity is high, and the embodiment of the present invention only needs to perform copy frame in the transcoder. Operation, very low complexity.
  • the adaptive intra refresh coding mode selection algorithm When the adaptive intra refresh coding mode selection algorithm is used in transcoding, its performance will theoretically be degraded compared to the adaptive intra refresh method implemented in this paper, because the input of the transcoding process is already compressed.
  • FIG. 6 is a schematic diagram of redundancy added performance at a 3% packet loss rate according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of redundancy added performance at a 5% packet loss rate according to an embodiment of the present invention
  • FIG. 8 is a method embodiment of the present invention.
  • FIG. 9 is a schematic diagram of redundancy addition performance at a 20% packet loss rate according to an embodiment of the method of the present invention.
  • FIG. 6 to FIG. 9 show different packet loss rates and target names.
  • the test sequence of "Foreman" when the resolution of the test video is 176x144, adaptively adds redundancy to the decoding performance according to the redundant description information and compares the performance of the fault tolerance protection with the adaptive intra refresh mode.
  • rdtYlostX indicates that the code stream generated based on the redundant description information of the ⁇ % packet loss rate is X% lost.
  • the RD curve of the decoded frequency, air_X% represents the RD curve of the adaptive intra-frame refresh coding mode selection at the encoding end with X% as the target packet loss rate and decoding at the X% packet loss rate.
  • the beneficial effects brought by the embodiment of the present invention include: the higher the packet loss rate, the greater the impact on the un-redundant code stream, and at the low packet loss rate, the packet loss is inherently Less, even adding redundancy
  • the improvement of the performance of the five-frame is also limited. Therefore, under the high packet loss rate, the objective quality improvement brought by the embodiment of the present invention is larger than the low packet loss rate.
  • the objective quality improvement caused by adding redundant frames at a low bit rate is not as high as the high code rate. Since the quality of the video is not high at low bit rate, the subtle difference between the preceding and succeeding frames is eliminated by large quantization. At this time, the method of error concealment is not too bad to mask the lost frame, so adding redundant frames does not make it possible. The objective quality has improved a lot. At high bit rates, the use of error concealment methods to mask lost frames is not good.
  • Adding redundant frames to L0 will improve the video quality.
  • Different packet loss rates require the addition of a different number of redundant frames. For example, at the 10% packet loss rate, if the redundant frame addition strategy corresponding to the 5% packet loss rate is adopted, the performance still has room for improvement. At this time, a better strategy is to adopt a 10% packet loss ratio. Redundant frame addition strategy.
  • the algorithm of the embodiment of the invention has no significant degradation in coding performance. At low packet loss rates, the performance of the embodiments of the present invention is slightly lost, but at a high
  • the performance of the embodiment algorithm of the present invention has an advantage.
  • the algorithm complexity of the embodiment of the present invention is far lower than the intra refresh.
  • the data server obtains, according to the packet loss rate corresponding to the at least two transmission networks in the data transmission network system, the data forwarding node for each data source block (Source Block) in the received code stream.
  • FEC protected data unit which is a group of one or more data packets >0) for forward error correction redundancy adjustment, to obtain fault-tolerant auxiliary information for a fault-tolerant code stream corresponding to a subsequent transmission network corresponding packet loss rate
  • the fault-tolerant auxiliary information includes forward error correction description information of a forward error correction set respectively corresponding to respective packet loss rates of the source transmission network and the target transmission network, the forward direction
  • the error correction set includes forward error correction redundancy respectively corresponding to the respective data source blocks at different packet loss rates, and each forward error correction set indicated by the forward error correction description information satisfies the following conditions:
  • the forward error correction set corresponding to the low packet loss rate is a subset of the forward error correction set corresponding to the high packet loss rate. It can be seen that the forward error correction set is an example
  • the proposed FEC description information can be used to provide assistance for FEC.
  • the specific implementation steps are as follows: First, when the video server generates video stream, for example, the video server stream generates FEC description information, indicating each data source block at different packet loss rates. The FEC redundancy should be actually allocated; and, in order for the FEC description information to support the scalable FEC adjustment operation, the generation of the description is a certain constraint, that is, the FEC redundancy of each data source block cannot be reduced when the packet loss rate is increased. ; then, attach these FEC descriptions
  • L0 is transmitted in the code stream or separately to the data forwarding node.
  • the data forwarding node may perform forward error correction redundancy on each data source block in the source stream according to the respective packet loss rate of the source transmission network and the target transmission network, and the FEC description information corresponding to the source stream. Adjust to obtain a fault-tolerant code stream that meets the packet loss rate of the target transmission network. Specifically, if the first packet loss rate corresponding to the source transmission network is smaller than the second packet loss corresponding to the target transmission network,
  • the L5 rate is based on the FEC description information, and the corresponding forward error correction redundancy is added on the basis of the forward error correction redundancy carried by each data source block in the source stream; if the first packet is corresponding to the source transmission network If the rate is greater than the second packet loss rate corresponding to the target transmission network, the corresponding forward error correction redundancy is discarded on the basis of the forward error correction redundancy carried by each data source block in the source stream according to the FEC description information. . If the first packet loss rate corresponding to the source transmission network is equal to the second packet loss rate corresponding to the target transmission network, the processing may be performed without any processing.
  • FIG. 10 is a schematic diagram of forward error correction description information used for FEC redundancy allocation according to an embodiment of a method according to the present invention.
  • FIG. 10 shows an application example of FEC description information in a video transmission system: Video server generation
  • the video stream carries the FEC description information to characterize the FEC redundancy that each video data source block should add at a given packet loss rate.
  • the data forwarding node arranges different redundancy rates according to the packet loss rate of the subsequent transmission network to achieve different FEC unequal protection.
  • the video packet of one GOP is divided into three data source blocks (white part in the figure), which are different data source blocks.
  • the data server may separately send fault-tolerant auxiliary information for describing the FEC allocation of the data in the transmitted code stream, so that the related data node can use the fault-tolerant auxiliary information for the data source blocks of different importance levels. Perform different FEC protections to ensure data transmission
  • the data forwarding node device is a node connected to different networks, and has certain storage and computing capabilities, and may be a streaming server, a media gateway, a router, etc. a device, etc., comprising a first receiving module 11, an encoding processing module 12, and a first transmitting module 13, wherein the first receiving module 11 is configured to receive a source from a source transmission network
  • the encoding processing module 12 is configured to detect a respective packet loss rate of the source transport network and the target transport network, and fault-tolerant auxiliary information corresponding to the source stream, to the source stream Performing a fault-tolerant coding process to obtain a fault-tolerant code stream;
  • the first sending module 13 is configured to send the acquired fault-tolerant code stream to the target transmission network.
  • the data server corresponds to at least two transmission networks in the data transmission network system.
  • the data forwarding node After the packet loss rate of >0, the fault-tolerant auxiliary information corresponding to the source stream is obtained, and the fault-tolerant auxiliary information is sent to the data forwarding node, the data forwarding node receives the fault-tolerant auxiliary information through the first receiving module 11. Since the data forwarding node has been aware of the respective loss of the source transmission network and the target transmission network during network formation The packet rate, after the first receiving module 11 receives the source stream sent by the data server, the code processing module 12 can perform the source stream according to the packet loss rate of the source transmission network and the target transmission network, and the fault-tolerant auxiliary information. Fast transcoding, using the fault-tolerant auxiliary information to quickly generate a fault-tolerant code stream that conforms to the packet loss characteristics of subsequent networks, react quickly to changes in packet loss rate, and change according to actual conditions.
  • the fault tolerance of the code stream such as adjusting the code stream redundancy rate and FEC protection strength.
  • the application first sending module 13 sends the fault-tolerant code stream to the terminal device or other data forwarding node through the target transmission network.
  • the encoding processing module 12 may adjust the code stream redundancy rate, the FEC protection strength, and the like according to the fault-tolerant auxiliary information, and may be completed by at least one sub-module included in the encoding processing module 12,
  • L0 includes:
  • the first processing sub-module 121 is configured to perform adaptive redundant frame adjustment on multiple data frames included in the source stream according to respective packet loss rates of the source transport network and the target transport network, and fault-tolerant auxiliary information corresponding to the source stream.
  • a data frame of a redundant frame needs to be generated in multiple data frames in L5, and each redundant frame set indicated by the description information satisfies the following condition: a redundant frame set corresponding to a low packet loss rate is a redundancy corresponding to a high packet loss rate A subset of the set of frames.
  • high-complexity transcoding is not required for the code stream, fault-tolerant auxiliary information under each packet loss rate is stored in the data forwarding node, and the information is used to implement scalable redundant allocation.
  • the coded stream with the highest coding efficiency can be transmitted in the wired network, and the data forwarding node can quickly respond to the fault-tolerant auxiliary information.
  • the second processing sub-module 122 is configured to perform forward error correction on each data source block in the source stream according to a respective packet loss rate of the source transmission network and the target transmission network, and fault-tolerant auxiliary information corresponding to the source stream. Adjusting, acquiring a fault-tolerant code stream, where the fault-tolerant auxiliary information includes forward error correction description information of a forward error correction set respectively corresponding to a respective packet loss rate of the source transmission network and the target transmission network, where the front The error correction set includes forward error correction redundancy respectively corresponding to the respective data source blocks at different packet loss rates, and each forward error correction set indicated by the forward error correction description information satisfies the following conditions: :
  • the forward error correction set corresponding to the low packet loss rate is a subset of the forward error correction set corresponding to the high packet loss rate.
  • the data forwarding node in the embodiment of the present invention may be a device such as a streaming server, a media gateway, or a router.
  • the data forwarding node device provided in this embodiment can perform fault-tolerant coding on the code stream that needs to be forwarded according to the fault-tolerant auxiliary information corresponding to the data code stream sent by the data server to obtain a fault-tolerant code stream, so as to adapt to the network of the subsequent transmission network packet loss rate. characteristic. Be able to make full and reasonable use of network resources, every time
  • L0 experiences changes and can react quickly, changing the fault tolerance of the code stream according to actual conditions.
  • FIG. 12 is a schematic structural diagram of Embodiment 1 of a network device according to the present invention.
  • the network device includes a first obtaining module 21 and a second sending module 22, where the first acquiring module 21 is used in a data transmission network system.
  • the packet loss rate corresponding to at least two transmission networks in the data transmission network system obtaining fault-tolerant auxiliary information corresponding to the source stream, and the fault-tolerant auxiliary information is used for data transmission
  • the data forwarding node in the L5 network system performs fault-tolerant coding processing on the received code stream to provide a reference for acquiring the fault-tolerant code stream.
  • the second sending module 22 is configured to send the fault-tolerant auxiliary information to the data forwarding node.
  • the first acquisition module 21 acquires fault-tolerant auxiliary information corresponding to the sent source stream, and the fault-tolerant auxiliary information is used. Received stream for data forwarding nodes in a data transmission network system
  • the first obtaining module 21 After acquiring the fault-tolerant code stream, the first obtaining module 21 sends the fault-tolerant auxiliary information to each data forwarding node in the data transmission network system for the data forwarding node to use for fault-tolerant coding.
  • the fault tolerant assistance information may be carried in the code stream with the accessory or sent separately.
  • the network packet loss rate uses the fault-tolerant auxiliary information to quickly generate a fault-tolerant code stream that conforms to the packet loss characteristics of the subsequent transmission network, and improves the fault-tolerant ⁇ of the code stream in different network packet loss rate environments.
  • FIG. 13 is a schematic structural diagram of Embodiment 2 of a network device according to the present invention.
  • the network device includes a first acquiring module 21 and a second sending module 22, where the first acquiring module 21 includes at least one submodule,
  • the submodules include:
  • the first obtaining sub-module 211 is configured to: according to the packet loss rate of the L5 to the at least two transmission networks in the data transmission network system, obtain, by the data forwarding node, perform adaptive redundant frame adjustment on the received code stream to obtain fault tolerance.
  • Fault-tolerant auxiliary information for code stream includes description information of a redundant frame set respectively corresponding to respective packet loss rates of at least two transmission networks in the data transmission network system, and the redundant frame set is used to identify multiple in the code stream
  • the data frame of the redundant frame needs to be generated in the data frame, and each redundant frame set indicated by the description information satisfies the following condition: the redundant frame set corresponding to the low packet loss rate is a >0 redundant frame set corresponding to the high packet loss rate. a subset of.
  • the second obtaining sub-module 212 is configured to obtain, according to a packet loss rate corresponding to at least two transmission networks in the data transmission network system, a data forwarding node to forwardly correct each data source block in the received code stream.
  • Error redundancy adjustment for obtaining fault-tolerant auxiliary information for a fault-tolerant code stream the fault-tolerant auxiliary information comprising forward error correction of a forward error correction set respectively corresponding to respective packet loss rates of at least two transmission networks in the data transmission network system
  • the forward error correction set includes forward error correction redundancy respectively corresponding to the respective data source blocks at different packet loss rates, and each of the first 5 of the forward error correction description information
  • the error correction set satisfies the following condition: the forward error correction set corresponding to the low packet loss rate is a subset of the forward error correction set corresponding to the high packet loss rate.
  • the second sending module 22 in the network device provided by the embodiment is further configured to generate a fault-tolerant code corresponding to the source stream according to the packet loss rate and the fault-tolerant auxiliary information corresponding to the transmission network between the data forwarding node.
  • the fault-tolerant code stream and the fault-tolerant auxiliary information are sent together to the data forwarding node.
  • the fault-tolerant auxiliary information corresponding to the code stream to be sent is obtained, so that the data forwarding node can not only increase the network loss according to different transmission network packet loss.
  • the fault tolerance of the code stream in the packet rate environment, and the delay is small, and the operation complexity is low, which is beneficial to real-time applications.
  • FIG. 14 is a schematic structural diagram of an embodiment of a network system according to the present invention.
  • the network system includes a network device 1, a data forwarding node device 2, and a terminal device 3, wherein the data forwarding node device 2 is configured to receive the source transmission network.
  • a source stream sent to the target transport network and based on the respective packet loss ratios of the source transport network and the target transport network, and fault-tolerant auxiliary information corresponding to the source stream,
  • the source device stream is subjected to fault-tolerant coding processing to obtain the fault-tolerant code stream, and then the acquired fault-tolerant code stream is sent to the target transmission network;
  • the network device 1 is configured to send the source code stream to the data transmission network system before Obtaining and reporting the packet loss rate corresponding to at least two transmission networks in the data transmission network system.
  • the fault-tolerant auxiliary information corresponding to the source stream, and sending the fault-tolerant auxiliary information to the data forwarding node; the fault-tolerant auxiliary information is used for performing fault-tolerant encoding on the received code stream for the data forwarding node in the data transmission network system Processing, to provide a reference for obtaining a fault-tolerant code stream.
  • the network device 1 provides a data source, and the data forwarding node device 2 is used for data sent to the terminal device 3
  • the network system further includes a plurality of transmission networks 4, which are respectively disposed between the network device 1, the data forwarding node device 2 and the terminal device 3, and are used between the network device 1 and the data forwarding node device 2, and between the data forwarding node devices 2 Provide data transmission channels.
  • the data forwarding node device and the network device provided by the above embodiments are respectively used in the L0 transmitting node device and the network device.
  • the data forwarding node in the embodiment of the present invention may be a device such as a streaming server, a media gateway, or a router.
  • the network device may be the data server involved in the foregoing embodiments.
  • the network device can be at least according to the data transmission network system
  • the packet loss rate corresponding to the two transmission networks acquires the fault-tolerant auxiliary information corresponding to the code stream to be transmitted, so that the data forwarding node can quickly generate the conforming transmission network according to the packet loss rate of different transmission networks.
  • the fault-tolerant code stream of the packet loss feature can not only improve the fault tolerance of the code stream in different network packet loss rate environments, but also has less delay and low operation complexity, which is beneficial to real-time applications.

Description

视频数据传输处理、 发送处理方法、 装置和网络系统 本申请要求于 2009年 9月 30日提交中国专利局, 申请号为 200910179726.5 , 发明名称为"视频数据传输处理、 发送处理方法、 装置和网络系统"的中国专利 5 申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明实施例涉及视频数据传输技术领域,尤其涉及一种视频数据传输处 理、 发送处理方法、 装置和网络系统。
L0 背景技术
现有的视频传输应用环境中存在多种不同的网络,包括有线网络和无线网 络, 它们具有不同的数据出错概率即信号传输的可靠性不同。 例如, 一视频传 输网络中, 视频服务器提供的视频码流经过媒体网关( Media Gateway )中转,
L5 媒体网关抽取并发送其他网络所需要的视频子码流。对于视频流应用, 网络传 输的延迟和丟包都会造成视频数据包的不可用,从而使得解码视频质量的严重 下降。 一般而言, 有线网络的丟包率较小, 传输速率较高, 而无线网络(例如 WLAN、 通过基站的 3G、 GPRS等网络)则与之相反。 有线网络的数据丟包率 较低, 其丟包主要是由网络中路由器的拥塞造成; 而在无线网络中, 有限的带
>0 宽、 高延迟、 高比特出错率导致了高丟包率。 由于无线环境下的出错概率远大于有线环境,为了使视频用户在访问视频 数据时能够在这些不同网络间进行无缝切换,视频服务器应该提供具有差错控 制功能。现有的差错控制技术包括容错转码, 其是在视频服务器提供适合有线 网络的码流, 然后在网络边界点加入转码器,给视频码流提供适合目标网络的 冗余。 以视频代理器作为转码器对原始码流解码再编码, 增加了转码器的复杂 度, 也增加了系统延时。 现有的差错控制技术还包括冗余帧编码, 其目的是利 用冗余信息保护一系列压缩后的图像,使其具有错误复原能力或者减小通信错 误对其的影响。但是该方法是在分别给定丟包率的情况下产生冗余帧, 可能造
5 成网络资源的浪费。如在视频服务器到第一数据转发节点的有线信道以及第一 数据转发节点到第二数据转发节点的无线信道中,前一段信道的出错概率低于 后一段信道,然而为了使第二数据转发节点之后的用户能获得较好的视频解码 质量,视频服务器要在码流中添加较多的冗余,从而导致了在视频服务器到第 一数据转发节点的信道中的带宽浪费。
L0 在实现本发明过程中,发明人发现现有技术中至少存在如下问题: 现有技 术中在丟包率不同的至少两个传输网络中, 固定使用一个丟包率生成码流,要 么根据较高丟包率生成码流, 则由于冗余过度, 导致带宽资源利用率低; 要么 根据较低丟包率生成码流, 则在网络条件变差时导致视频质量下降。 ί5 发明内容
本发明实施例提供一种视频数据传输处理、发送处理方法、装置和网络系 统, 以提高不同的网络丟包率环境下码流的容错能力。
本发明实施例提供一种视频数据传输处理方法, 包括:
接收来自源传输网络发往目标传输网络的源码流;
>0 根据所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码 流对应的容错辅助信息, 对所述源码流进行容错编码处理, 获得容错码流; 向所述目标传输网络发送获取到的所述容错码流。 本发明实施例提供一种视频数据发送处理方法, 包括:
在向数据传输网络系统发送源码流之前,根据所述数据传输网络系统中至 少两个传输网络所对应的丟包率, 获取与所述源码流对应的容错辅助信息; 所 述容错辅助信息用于为所述数据传输网络系统中的数据转发节点对接收到的 5 码流进行容错编码处理、 以获取容错码流提供参考;
向所述数据转发节点发送所述容错辅助信息。
本发明实施例提供一种数据转发节点设备, 包括:
第一接收模块, 用于接收来自源传输网络发往目标传输网络的源码流; 编码处理模块,用于根据所述源传输网络和所述目标传输网络各自的丟包 L0 率,以及与所述源码流对应的容错辅助信息,对所述源码流进行容错编码处理, 获得容错码流;
第一发送模块, 用于向所述目标传输网络发送获取到的所述容错码流。 本发明实施例提供一种网络设备, 包括:
第一获取模块, 用于在向数据传输网络系统发送源码流之前,根据所述数 L5 据传输网络系统中至少两个传输网络所对应的丟包率,获取与所述源码流对应 的容错辅助信息;所述容错辅助信息用于为所述数据传输网络系统中的数据转 发节点对接收到的码流进行容错编码处理、 以获取容错码流提供参考;
第二发送模块, 用于向所述数据转发节点发送所述容错辅助信息。
本发明实施例提供一种网络系统, 包括:
>0 数据转发节点设备, 用于接收来自源传输网络发往目标传输网络的源码 流,根据所述源传输网络和所述目标传输网络各自的丟包率, 以及与所述源码 流对应的容错辅助信息,对所述源码流进行容错编码处理获取容错码流后, 向 所述目标传输网络发送获取到的所述容错码流;
网络设备, 用于在向数据传输网络系统发送源码流之前, 根据所述数据 传输网络系统中至少两个传输网络所对应的丟包率,获取与所述源码流对应的 容错辅助信息, 向所述数据转发节点设备发送所述容错辅助信息; 所述容错辅 5 助信息用于为所述数据传输网络系统中的数据转发节点设备对接收到的码流 进行容错编码处理、 以获取容错码流提供参考。
本发明实施例提供的视频数据传输处理、发送处理方法、装置和网络系统, 数据服务器能够根据数据传输网络系统中至少两个传输网络所对应的丟包率, 获取与要发送的码流对应的容错辅助信息,使得数据转发节点能够根据不同传 L0 输网络丟包率,利用该容错辅助信息快速地生成符合后续传输网络丟包特性的 容错码流, 能够提高不同的网络丟包率环境下码流的容错能力。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中 L5 所需要使用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本发 明的一些实施例,对于本领域普通技术人员来讲, 在不付出创造性劳动性的前 提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例中容错辅助信息的提取及使用方法示意图; 图 2为本发明数据发送处理方法实施例流程图;
>0 图 3为本发明数据传输处理方法实施例流程图;
图 4为本发明实施例视频传输过程中丟包率增高的应用场景示意图; 图 5为本发明实施例视频传输过程中丟包率降低的应用场景示意图; 图 6为本发明方法实施例在 3%丢包率下冗余添力口生能示意图; 图 7为本发明方法实施例在 5%丢包率下冗余添力口生能示意图;
图 8为本发明方法实施例在 10%丢包率下冗余添力口生能示意图; 图 9为本发明方法实施例在 20%丢包率下冗余添力口生能示意图; 图 10为本发明方法实施例前向纠错描述信息用于 FEC冗余分配示意图; 5 图 11为本发明数据转发节点设备实施例结构示意图;
图 12为本发明网络设备实施例一结构示意图;
图 13为本发明网络设备实施例二结构示意图;
图 14为本发明网络系统实施例组成示意图。
L0 具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚, 下面将结合本发明 实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。基于本发明中 的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其
L5 他实施例, 都属于本发明保护的范围。
随着网络技术的不断发展,各种类型的网络例如有线网络和无线网络可以 进行网络融合,通过形成综合的网络体系来满足用户的不同需求。但是由于各 种类型的网络具有不同的丟包率,网络传输的丟包会造成例如视频数据包的不 可用, 从而使得解码视频质量的严重下降。 为了满足不同网络的丟包率, 考虑
>0 若能够充分合理地利用网络资源, 并提供较好的视频质量,每次经历变化都可 以快速地做出反应, 根据实际的条件改变码流的容错能力, 例如: 改变码流冗 余率和改变前向纠错 ( Forward Error Correct ion; 以下筒称: FEC )保护力 度等等, 便可以提高不同的网络丟包率环境下码流的容错能力。 综上所述,本发明各实施例针对数据码流在网络传输中面临不同丟包率的 情况, 提出一种错误弹性可伸缩的编码与传输方案, 图 1为本发明实施例中容 错辅助信息的提取及使用方法示意图, 如图 1所示, 首先, 在编码端进行分析 和计算,根据网络环境和视频特征, 生成详细的描述信息用于辅助后期容错码
5 流的生成, 该信息定义为容错辅助信息; 该容错辅助信息可以嵌入在码流中或 是通过其他途径传递给各数据转发节点; 然后, 考虑传输过程中网络的变化, 数据转发节点根据后续网络的丟包率,利用该容错辅助信息快速地生成符合后 续网络丟包特性的容错码流。本发明实施例通过引入容错辅助信息,数据转发 节点就可以根据辅助信息以及相应的丟包率进行快速转码,这样不仅可以充分
L0 利用系统带宽资源, 并且延迟少, 操作复杂度低有利于实时应用。 图 1中, 数 据转发节点可以是流服务器、媒体网关、 路由器等设备; 容错辅助信息可以用 于码流的冗余帧添加、 和 FEC等等。
图 2为本发明数据发送处理方法实施例流程图, 如图 2所示, 该方法包括: 步骤 100, 数据服务器在向数据传输网络系统发送源码流之前, 根据所述
L5 数据传输网络系统中至少两个传输网络所对应的丟包率,获取与所述源码流对 应的容错辅助信息;
本实施例中所述的数据传输网络系统包括用于提供数据源的数据服务器, 还包括多个用于对发送的数据进行中转的数据转发节点以及用户设备终端,数 据服务器、数据转发节点和终端设备之间通过各种传输网络连接,传输网络为
>0 数据传输提供通道。基于网络融合技术,数据传输网络系统中的至少两个传输 网络具有不同的丟包率,数据服务器例如视频服务器为了使得发送出去的视频 码流能够适应不同传输网络的网络丟包特性,保证数据传输可靠性,视频服务 器在向数据传输网络系统中的某一数据转发节点发送视频码流前 ,要获取到所 发送的源码流对应的容错辅助信息,所述容错辅助信息包括与数据传输网络系 统中至少两个传输网络例如源传输网络和目标传输网络各自的丟包率分别对 应的容错数据集合的描述信息,容错数据集合用于标识源码流中需要调整的容 5 错数据,且描述信息表示的各个容错数据集合满足以下条件: 低丟包率对应的 容错数据集合为高丟包率对应的容错数据集合的子集。该容错辅助信息用于为 数据传输网络系统中的数据转发节点对接收到的码流进行容错编码处理、以获 取符合后续的传输网络对应丟包率的容错码流提供参考,也就是说数据转发节 点能够根据容错辅助信息,针对该数据转发节点后续的传输网络的丟包率进行
L0 快速转码, 利用该容错辅助信息快速地生成符合后续网络丟包特性的容错码 流。
视频服务器是要根据数据传输网络系统中至少两个传输网络所对应的丟 包率, 生成容错辅助信息, 也就是说, 容错辅助信息所描述的信息可以适应于 不同丟包率的传输网络, 数据转发节点在接收到上一个传输网络发送的码流 L5 后, 能够在容错辅助信息的辅助下,从中找出对应于上下传输网络两种丟包率 所要进行的容错操作规则, 并根据指示进行容错转码形成容错码流。 当然, 不 同的特性的数据码流应对应有不同的容错辅助信息, 以满足需求。 在本发明实 施例中, 数据服务器可以是视频服务器、 点播服务器等设备。
步骤 101 , 所述数据服务器向所述数据转发节点发送所述容错辅助信息。 >0 数据服务器在获取到所要发送的视频码流对应的容错辅助信息后,将该容 错辅助信息发送给数据传输网络系统中各数据转发节点,供数据转发节点容错 编码用。 数据服务器在将视频数据发送给与其连接的数据转发节点前,为了适应该 数据转发节点之间的传输网络的丟包率,应该对源码流进行容错编码, 当然是 要结合之前获取到的容错辅助信息来生成。数据服务器在根据与数据转发节点 之间的传输网络对应的丟包率以及容错辅助信息,生成与源码流对应的容错码
5 流后, 可以将该容错码流和容错辅助信息一同发送给数据转发节点。 当然, 容 错码流和容错辅助信息也可以分别独立发送。
本发明实施例提供的数据发送处理方法,数据服务器根据数据传输网络系 统中至少两个传输网络所对应的丟包率,获取与要发送的码流对应的容错辅助 信息, 并将容错辅助信息发送给数据转发节点,使得数据转发节点能够根据不
L0 同传输网络丟包率,利用该容错辅助信息快速地生成符合后续传输网络丟包特 性的容错码流, 不仅能够提高不同的网络丟包率环境下码流的容错能力, 而且 延迟少, 操作复杂度低有利于实时应用。
图 3为本发明数据传输处理方法实施例流程图, 如图 3所示, 该方法包括: 步骤 200 , 接收来自源传输网络发往目标传输网络的源码流;
L5 在数据服务器根据数据传输网络系统中至少两个传输网络, 例如,数据转 发节点的源传输网络和目标传输网络所对应的丟包率,获取到与源码流对应的 容错辅助信息, 并将容错辅助信息发送给数据转发节点后,数据转发节点接收 到该容错辅助信息。本实施例中涉及的源传输网络和目标传输网络是指从数据 的流向而言,数据转发节点两端的传输网络。数据转发节点接收到的源码流可
>0 以是数据服务器发送的, 也可以是其他数据转发节点发送的。例如数据服务器 一同将源码流经由数据转发节点发送给终端设备,本实施例中可以将所述的数 据服务器与数据转发节点之间的传输网络称之为源传输网络,数据转发节点与 终端设备之间的传输网络称之为目标传输网络,也就是说数据服务器发送的源 码流是要通过源传输网络发往目标传输网络的。
步骤 201 , 根据所述源传输网络和所述目标传输网络各自的丟包率, 以及 与所述源码流对应的容错辅助信息,对所述源码流进行容错编码处理, 获得容 5 错码流;
由于网络组建时该数据转发节点已经获知源传输网络和目标传输网络各 自的丟包率, 因此数据转发节点接收到数据服务器发送的源码流后,可以根据 源传输网络和目标传输网络各自的丟包率, 并结合容错辅助信息,对该源码流 进行快速转码,利用该容错辅助信息快速地生成符合后续网络丟包特性的容错
L0 码流,针对丟包率变化快速地做出反应,根据实际的条件改变码流的容错能力, 例如码流冗余率和 FEC保护力度等等。所述的容错编码过程应该有别于视频编 码过程, 容错编码是复杂度较低的容错能力改变的操作, 可以是直接的码流拷 贝, 或者是添加部分编码过程等。
步骤 202, 向所述目标传输网络发送获取到的所述容错码流。
L5 数据转发节点获取到适合后续传输网络的容错码流后,将该容错码流通过 目标传输网络发送给终端设备或其他的数据转发节点。 另外, 该数据转发节还 可以将容错辅助信息与容错码流一起或单独转发给其他的数据转发节。
本实施例提供的数据传输处理方法,数据转发节点能够根据数据服务器发 送的对应于数据码流的容错辅助信息,对需要进行转发的码流进行容错编码获
>0 得容错码流, 以适应后续传输网络丟包率的网络特性。 能够充分合理地利用网 络资源,每次经历变化都可以快速地做出反应,根据实际的条件改变码流的容 错能力。 上述各实施例中涉及的容错辅助信息可以适用于多种应用环境,以下分别 给出应用容错辅助信息进行自适应冗余帧调整和 FEC保护的应用实例。
对于自适应冗余帧调整的实施例,数据服务器根据数据传输网络系统中至 少两个传输网络所对应的丟包率,获取供数据转发节点对接收到的码流进行自
5 适应冗余帧调整、以获取符合后续的传输网络对应丟包率的容错码流用的容错 辅助信息,所述的容错辅助信息包括与数据传输网络系统中至少两个传输网络 各自的丟包率分别对应的冗余帧集合的描述信息,所述的冗余帧集合用于标识 所述码流中的多个数据帧中需要生成冗余帧的数据帧,且描述信息表示的各个 冗余帧集合满足以下条件:低丟包率对应的冗余帧集合为高丟包率对应的冗余
L0 帧集合的子集。 由此可知, 所述的冗余帧集合为上述实施例中所述容错数据集 合的一个实例。对应于数据转发节点而言,数据转发节点可以根据源传输网络 和目标传输网络各自的丟包率, 以及与源码流对应的容错辅助信息,对接收到 的源码流中包括的多个数据帧进行自适应冗余帧调整,获取符合目标传输网络 对应丟包率的容错码流。
L5 在本实施例中,可将容错辅助信息应用于码流的自适应冗余帧添加, 具体 实施步骤如下: 首先, 在数据服务器的编码过程中估计信源信道的总体失真, 提取不同丟包率前提下每帧的冗余描述信息; 其次, 将这些极少数的信息附加 在码流中进行传输或者单独传递给数据转发节点; 然后,数据转发节点就可以 根据冗余描述信息指对不同丟包率进行自适应冗余添加或删除。
>0 上述的冗余描述信息即为容错辅助信息的一个实例, 其提取过程包括: 首 先,针对至少两个传输网络的丟包率, 分别在不生成冗余帧以及生成冗余帧的 两种情况下,对码流中各数据帧对应的两组信源信道失真信息进行计算;然后, 应用率失真模型,对计算获得的两组信源信道失真信息所对应的数据帧在对应 的丟包率条件下是否需要生成冗余帧进行判断,获得判断结果, 即利用率失真
Ε
模型为不同的丟 d包率分别选取性能最好的冗余帧产生方式; 最后,根据判断结
=
果,获得采用合理的方、式组织并描述与各丟包率分别对应的冗余帧集合的描述 信息。 以下进行详细介绍。
/—
其中, 信源信道的失真采用改进的递归优化像素级估计 (Rrcursive Optimal Per-pixel Estimate; 以下筒称: ROPE)算法来进行估计。 假设一个视频帧的码 流在传输的过程中被封装在一个数据包中,因此在当前的丟包率为 p的情况下, 对每个视频帧而言, 其丟失的概率也是 p。 若原始视频序列第 n帧中第 i个像素 的值为 其编码端重建值为 , 解码端重建值为 则信源信道总体失真 可表述为 和 的均方差。 由于在编码端得不到码流经过差错信道传输后解 码端的精确重建值,可将 看做一个差错信道下的随机信号,信源信道总体失 真变成:
Figure imgf000013_0001
_ 1
、 / I
ΐ!)2 + Ε[( Ϊ! - Ϊ!)2} + Ε<
+ Ε^( f„ 2ίη ]ϋΕ f , 、
(2)
Ε
其中, n 表 ^示信信淤源失决直真,, ' )表示信道失真, 公式(1 ) 中的第三项是信源失真和信道失真的相关。 此外, 公式(2)给出了信源信道 总体失真的另外一种表示方式, 可以看到,估计信源信道总体失真就是要估计
¾的一阶矩和二阶矩。本发明实施例提供一种基于像素估计该一阶矩和二阶矩 的方法—— ROPE。 假设解码端采用的错误隐藏方法是 FC, 则可以采用递推的 方式按照像素编码模式计算一阶矩和二阶矩:
帧内预测 ( Intra prediction ; 以下筒称: Intra)编码块中的像素:
Figure imgf000014_0001
帧间预测 ( Inter prediction ; 以下筒称: Inter)编码块中的像素:
E{f;}{P}=(l-p)(e; + E{fni1})+pE{ 1} (5)
E j( ξί )2J{P} =(l-p)E j(¾ + E { d})2卜 PE j(
= (ΐ-ρ)((¾)2 + 2¾Ε{ί } + Ε{(¾ { n'lJi (6) 其中 Inter编码中当前帧的第 i个像素是参考上一帧 (参考帧) 中根据运动补偿 得到的对应位置〗的像素, 预测误差 量化后变成 。
在本实施例计算当前帧像素的信源信道总体失真过程中,必须考虑当前帧 有冗余帧的情况, 与 ROPE方法不同的是, 此时冗余帧中的像素的模式与当前 帧同一位置的像素的模式可能不同, 即使同一个 Inter模式, 其运动矢量也可能 不同, 因此本实施例在计算像素的一阶矩和二阶矩时, 考虑到这些模式的组合 提出了如下的递推公式:
1 ) 冗余帧和当前帧的像素都在 Intra块中:
Figure imgf000014_0002
+ (ΐ- )¾ + 2Ε{¾ ( 7 )
Figure imgf000015_0001
) 冗余帧和当前帧的像素都在 Inter块中:
Ε{ί;}{ΡΡ} = (ΐ- )(¾ + Ε{ί })
+ p(l-p)E((e; +Ε{¾})2)+ 2
Figure imgf000015_0002
Ε (¾) {ΡΡ} = (l-p)E (¾ + Ε| fn!
Figure imgf000015_0003
= (ΐ-ρ)ί(έ )2 +2έ:Ε{ί } + Εί(ί )
+ Ρ(1-Ρ) ¾ +2¾Ε ίΛ +Ε ίΛ +Ρ f ) 冗余帧中的像素在 Intra块中, 当前帧的像素在 Inter块中
Ε{ }{ΙΡ} = (1- Ρ)( +Ε{ })(1- P) + P¾{¾—
(11)
(f;) }{lP} =
Figure imgf000015_0004
(丄- ρ)( )2 + ρί( (12) ) 冗余帧中的像素在 Inter块中, 当前帧的像素在 Intra块中
£{¾}{?1}=(1-?
+ ρ(ΐ-ρ)Εί(¾+Ε{¾})2)+Ρί(¾-
(13)
Figure imgf000015_0005
Figure imgf000015_0006
在当前帧中, Inter块的像素 i参考前一帧(参考帧)中像素 j , 预测误差 量化为^ 在冗余帧中, Inter块的像素 i参考前一帧 (参考帧) 中像素 jr , 预 测误差 e;。量化为 。
下面考虑整帧的总的信源信道失真(M是每帧中的像素个数) :
M
D =∑E{d:}
Figure imgf000016_0001
利用公式(15 ) 以及公式(3 ) -公式(14) , 可以分别计算出当前帧在 生成冗余帧和不生成冗余帧的两种情况下的信源信道总体失真, 进一步, 将 不编冗余帧和编一个冗余帧看成两种模式, 分别为 model和 mode2, 利用率失 真准则进行模式选择:
RDcost(model) = Dj +21^ ( 16 )
RDcost(mode2) = D2 ( 17 )
Dl是利用公式(3 ) -公式(6)以及公式(15 )计算出来的没有冗余帧时 的该帧信源信道总体失真; D2是利用公式(7) -公式(14) 以及公式(15 ) 计算出来的有一个冗余帧时的该帧信源信道总体失真。 是当前帧的码率, 是含有冗余帧时的总码率。 式中 是有错情况下的拉格朗日参数, 具体计算方 法请参看下面实施例。 当 model的代价函数值大于 mode2的代价函数值时, 可 以为当前帧分配一个冗余帧。
根据以上所述方法, 对不同的丟包率生成不同的冗余帧集合:
¾x%={Pr_x l X = 3,5,10,20} ( 18) 下条件:
U 5 £ ¾ I ( 19 ) 在实际操作过程中, 编码生成冗余信息时, 首先生成 20%丟包率下的冗余 帧集合 2。%, 然后, 依次对 10%, 5%, 3%丟包率下的每一帧加如下约束: 如 5 果比当前丟包率高的情况下下该帧生成了冗余帧,则该帧在当前丟包率下才可 能生成冗余帧; 否则该帧必然不产生冗余帧。 实验表明, 加了这个约束之后与 各个丟包率独立生成冗余帧相比, 性能没有明显下降。 然后通过一定的方式, 对某一帧在哪些丟包率下需要生成冗余帧的信息进行描述并传输,使得数据转 发节点可以利用这些信息快速为码流添加或删除冗余帧, 来适应不同的丟包 L0 率。
数据转发节点根据源传输网络和所述目标传输网络各自的丟包率,以及与 源码流对应的容错辅助信息,对源码流中包括的多个数据帧进行自适应冗余帧 调整具体可以包括以下三种情况:
若源传输网络对应的第一丟包率小于目标传输网络对应的第二丟包率,则
L5 根据描述信息表示的、与第一丟包率对应的第一冗余帧集合和与第二丟包率对 应的第二冗余帧集合,在携带有与第一丟包率对应的冗余帧的源码流中, 添加 第二冗余帧集合比第一冗余帧集合多出的冗余帧。 图 4为本发明实施例视频传 输过程中丟包率增高的应用场景示意图, 如图 4所示, 视频服务器端生成的是 符合当前丟包率的低冗余码流(3% ) 以及冗余描述信息, 而在数据转发节点
>0 处针对后端较高的丟包率 (例如 5%、 20% ) , 根据冗余描述信息的指示, 确 定当前丟包率 (5%、 20% ) 下需要添加冗余但却没有冗余的帧, 再通过帧拷 贝或者生成不同质量副本等操作为其添加冗余帧。 此操作复杂度低, 可以保证 整个系统的效率达到最优, 并且能够提高传输视频的质量。
若源传输网络对应的第一丟包率大于目标传输网络对应的第二丟包率,则 根据描述信息表示的、与第一丟包率对应的第一冗余帧集合和与第二丟包率对 应的第二冗余帧集合,在携带有与第一丟包率对应的冗余帧的源码流中,丟弃 5 第一冗余帧集合比所述第二冗余帧集合多出的冗余帧。 图 5为本发明实施例视 频传输过程中丟包率降低的应用场景示意图, 如图 5所示, 视频服务器端生成 的是最高丟包率(20% )情况下对应的码流以及冗余描述信息。 在切换到某一 较低丟包率的信道时, 可以根据丟包率从码流中丟弃相应的冗余帧。例如第一 转码器 (即数据转发节点)将高冗余码流转为适合有线局域网 (丟包率 3% ) L0 中传输的码流, 第二转码器将高冗余码流直接传输或者变为次高冗余的码流 (丟包率 10% )再传输给基站, 第三转码器将高冗余码流转为较低冗余的码流 (丟包率 5% )传输给无线节点。 在这种方案下, 虽然保存在视频服务器中的 是最大冗余率的码流,但是由于不需要重新编码生成冗余帧, 可以提供灵活的 错误弹性, 对整个系统的效率而言益处明显。
L5 若源传输网络对应的第一丟包率等于目标传输网络对应的第二丟包率,则 可以不做任何调整直接进行数据转发。
本发明实施例采用基于像素的失真估计算法,能精确地完成自适应冗余帧 分配, 再加入可伸缩性的约束, 能够产生一个具有错误弹性可伸缩的冗余。 更 进一步, 对每帧使用极少数比特(例如 3比特)来记录这些冗余描述信息, 具 >0 体地, 冗余描述信息可以在附加在每一帧的数据中, 也可以对一个图像组 ( Group Of Pictures; 以下筒称: GOP )或一个视频统一进行描述, 将该描述 信息附加在 GOP的头端或视频的头端, 使得面向不同丟包率的应用时, 整个传 输系统的带宽效率达到最高。
以下本实施针对上述实施例中丟包率增高的应用进行了实验,实验环境如 下: 验平台: H.264/AVC参考软件 JM 10.2; 序列: Foreman; 视频尺寸 QCIF; 帧率 15Hz; 量化参数 QP=20、 24、 28、 32、 36、 40; Intra周期为 40; GOP结构 5 为 IPPP... ; 编码 4000帧; 丟包率: 3%、 5%、 10%、 20% , 本发明实施例采用 的丟包工具中一帧为一个包; 多次解码: 在不同的丟包率下, 对丟包文件进行 随机偏移, 解码三次取其峰值信噪比(Peak Signal-to-Noise Ratio ; 以下筒称: PSNR )平均值。
通过以上的不同量化参数 QP产生的码流经过一定的丟包率可以得到一条 L0 率失真 (Rate-Distortion ; 以下筒称: RD ) 曲线, 利用前四个 QP点, 采用本 发明实施例提供的方法可以算出两条曲线之间的平均 PSNR差值。
首先,在不含冗余的码流中按照上述实施例的算法添加与丟包率相对应的 冗余帧。 表 1展示该码流相对不添加冗余帧的码流在该丟包率下的性能提升, 0%vsX%行展示的是 X%丟包率下产生的含有冗余帧的码流与无冗余帧的码流 L5 在 X%丟包率下的性能提升。 例如, 在信道丟包率 3%下, 如果按照冗余帧辅助 信息中 3%丟包率下对应的添加冗余帧方式添加冗余, 其性能比不添加冗余帧 好 0.84dB。 由此可知, 采用本算法生成的含冗余帧码流在不同丟包率下性能均 有提升,并且,随着丟包率的增大,性能提升越显著。对于较低的丟包率(3% ) , 可以获得接近 ldB的客观质量提升; 对于高的丟包率 (20% ) , 可以获得接近 >0 8dB的客观质量提升。
表 1不同丟包率下冗余帧性能的比较
△PSNR(dB) ABitRate(%) 0%vs3% 0.84 -16.82
0%vs5% 2.42 -45.75
0%vsl0% 5.59 -99.97
0%vs20% 7.62 <-100.00
其次, 为了体现上述实施例中不同丟包率下冗余帧可伸缩的性能,在应用 时只存储冗余较少的码流,再根据实际传输信道的丟包率,按照上述实施例的 方法自适应的添加冗余。 表 2中 Y%vsX%行展示的是信道丟包率为 X%时, 直 接传输丫%丟包率下产生的冗余码流与传输自适应的添加冗余生成符合 X%丟 包率的冗余码流的性能比较。 例如, 5%vsl0%行展示了在信道丟包率 10%下, 如果利用冗余描述信息添加冗余生成符合 10%丟包率的码流,其性能比直接传 输在丟包率为 5%时生成的码流要提高 1.05dB。 并且, 信道丟包率越高, 性能 提升越明显, 对于中等丟包率 (10% ) , 可以获得接近 ldB的客观质量提升; 对于高的丟包率 (20% ) , 可以获得接近 0.7dB的客观质量提升。 该实验结果 表明, 采用本算法生成的不同丟包率下的冗余帧集合具有可伸缩性, 即根据相 应的丟包率可以快速自适应添加冗余帧以提高解码质量。
表 2 不同丟包率下冗余帧可伸缩性能的比较
Figure imgf000020_0001
再次, 表 3展示了利用冗余描述信息进行容错保护与自适应帧内刷新方式 进行容错保护的性能比较。其中, 各行表示利用这两种方式进行容错保护的码 流在各种丟包率下的解码性能比较。在低丟包率下, 本实施例算法性能略有下 降, 但是在高丟包率下, 本实施例算法性能有提高。 综合考虑其算法的编码复 杂度,由于帧内刷新转码是在转码器中执行级联的解码与编码操作,复杂度高, 而本发明实施例只需要在转码器中执行拷贝帧的操作, 复杂度极低。值得注意 的是: 自适应帧内刷新编码模式选择算法用在转码中时, 理论上其性能会比本 文中实现的自适应帧内刷新方法性能下降,原因是转码过程的输入是已经压缩 过码流的重建, 利用该重建经过再次编码, 性能会比直接在原始序列编码时采 用帧内刷新模式选择算法性能下降。 因此, 本发明实施例利用冗余描述信息进 行容错保护的算法如果与转码过程中使用帧内刷新相比, 性能会有进一步提 升。
表 3 自适应冗余帧添加与自适应帧内刷新性能比较
Figure imgf000021_0001
图 6为本发明方法实施例在 3%丟包率下冗余添加性能示意图, 图 7为本发 明方法实施例在 5%丟包率下冗余添加性能示意图, 图 8为本发明方法实施例在 10%丟包率下冗余添加性能示意图, 图 9为本发明方法实施例在 20%丟包率下 冗余添加性能示意图, 图 6至图 9展示的是不同丟包率、 针对名为 "Foreman" 的测试序列, 测试视频的分辨率为 176x144的情况下, 根据冗余描述信息自适 应的添加冗余对解码性能的影响以及与自适应帧内刷新方式进行容错保护的 性能比较。 rdtYlostX表示根据丫%丟包率的冗余描述信息生成的码流在 X%丟包 率下解码的 RD曲线, air_X%表示以 X%作为目标丟包率在编码端进行自适应帧 内刷新编码模式选择, 并且在 X%丟包率下解码的 RD曲线。
从上图中可以更直观的看到本发明实施例带来的有益效果包括:丟包率越 高对不加冗余的码流影响越大, 而在低丟包率下, 丟包本来就少, 即使加入冗
5 余帧性能提升也有限, 因此在高丟包率下, 本发明实施例带来的客观质量的提 升比低丟包率大。低码率下增加冗余帧带来的客观质量提升不及高码率。 由于 视频在低码率下质量不高, 前后帧之间细微差别被大的量化消除了,此时用差 错隐藏的方法对丟失帧进行掩盖效果不会太差,因此加入冗余帧并不能使客观 质量提升较大。 而高码率下, 利用错误隐藏方法掩盖丟失帧的效果不好, 此时
L0 加入冗余帧会使视频质量提升较大。 不同的丟包率需要加入不同数量的冗余 帧。 如在 10%丟包率下, 如果采用与 5%丟包率相对应的冗余帧添加策略, 其 性能仍有提升空间,此时一个更好的策略就是采用与 10%丟包率相对应的冗余 帧添加策略。本发明实施例算法与自适应帧内刷新编码模式选择算法相比, 编 码性能没有明显下降。 在低丟包率下, 本发明实施例性能略有损失, 但是在高
L5 丟包率下, 本发明实施例性算法性能有优势。但是本发明实施例算法复杂度远 远低于帧内刷新。
对于 FEC保护的实施例,数据服务器根据数据传输网络系统中至少两个传 输网络所对应的丟包率,获取供数据转发节点对接收到的码流中各个数据源块 ( Source Block, 指统一进行 FEC保护的数据单元, 是一个或多个数据包的组 >0 合 )进行前向纠错冗余调整、 以获取符合后续的传输网络对应丟包率的容错码 流用的容错辅助信息,所述容错辅助信息包括与所述源传输网络和所述目标传 输网络各自的丟包率分别对应的前向纠错集合的前向纠错描述信息,所述前向 纠错集合包括分别对应于所述各个数据源块在不同丟包率下应分配的前向纠 错冗余,且所述前向纠错描述信息表示的各个前向纠错集合满足以下条件: 低 丟包率对应的前向纠错集合为高丟包率对应的前向纠错集合的子集。 由此可 知, 所述的前向纠错集合为上述实施例中容错数据集合的一个实例。 。 本实施
5 例提出的 FEC描述信息可以用来为 FEC提供协助, 具体实施步骤如下: 首先, 在数据服务器例如视频服务器端生成视频码流时同时生成 FEC描述信息,指示 不同丟包率下各个数据源块应实际分配的 FEC冗余; 并且, 为了使 FEC描述信 息可以支持可伸缩的 FEC调整操作, 在生成该描述是增加一定的约束, 即丟包 率增加时各个数据源块的 FEC冗余不可减少; 然后, 将这些 FEC描述信息附加
L0 在码流中进行传输或者单独传递给数据转发节点。
对于数据转发节点而言,数据转发节点可以根据源传输网络和目标传输网 络各自的丟包率, 以及与源码流对应的 FEC描述信息, 对源码流中各个数据源 块进行前向纠错冗余调整, 获取符合目标传输网络对应丟包率的容错码流。具 体地包括,若源传输网络对应的第一丟包率小于目标传输网络对应的第二丟包
L5 率, 则根据 FEC描述信息, 在源码流中各个数据源块所携带的前向纠错冗余的 基础上,增加对应的前向纠错冗余; 若源传输网络对应的第一丟包率大于目标 传输网络对应的第二丟包率, 则根据 FEC描述信息, 在源码流中各个数据源块 所携带的前向纠错冗余的基础上,丟弃对应的前向纠错冗余。若源传输网络对 应的第一丟包率等于目标传输网络对应的第二丟包率 ,则可以不做任何处理直
>0 接进行数据转发。
图 10为本发明方法实施例前向纠错描述信息用于 FEC冗余分配示意图,如 图 10展示了 FEC描述信息在视频传输系统中的一个应用实例: 视频服务器生成 视频码流并携带 FEC描述信息,来表征每个视频数据源块在给定丟包率前提下 应添加的 FEC冗余。数据转发节点根据后续传输网络的丟包率为各个视频数据 源块安排不同冗余率以实现的 FEC不等保护。 如图所示的例子中, 将一个 GOP 的视频数据包分为三个数据源块(如图中白色部分), 分别为不同的数据源块
5 添加不同的冗余(如图灰色部分), 这样通过数据转发节点传输出去的码流都 可以在当前丟包率下达到最优的性能, 且操作复杂度相对较低。
本实施例提供的方法中,数据服务器可以在发送的码流中或单独发送用于 描述数据 FEC分配情况的容错辅助信息,使得相关数据节点能够根据容错辅助 信息对不同重要性等级的数据源块进行不同的 FEC保护,既保证数据的传输的
L0 可靠性, 而且能够提高带宽资源的利用率。
图 11为本发明数据转发节点设备实施例结构示意图,如图 11所示, 该数据 转发节点设备是连接不同网络的节点, 具有一定的存储和计算能力, 可以是流 服务器、 媒体网关、 路由器等设备等, 其包括第一接收模块 11、 编码处理模块 12和第一发送模块 13 ,其中第一接收模块 11用于接收来自源传输网络发往目标
L5 传输网络的源码流;编码处理模块 12用于才艮据所述源传输网络和所述目标传输 网络各自的丟包率, 以及与所述源码流对应的容错辅助信息,对所述源码流进 行容错编码处理, 获得容错码流; 第一发送模块 13用于向所述目标传输网络发 送获取到的所述容错码流。
具体地,在数据服务器根据数据传输网络系统中至少两个传输网络所对应
>0 的丟包率, 获取到与源码流对应的容错辅助信息, 并将容错辅助信息发送给数 据转发节点后,数据转发节点通过第一接收模块 11接收到该容错辅助信息。 由 于网络组建时该数据转发节点已经获知源传输网络和目标传输网络各自的丟 包率, 因此第一接收模块 11接收到数据服务器发送的源码流后, 可以通过编码 处理模块 12根据源传输网络和目标传输网络各自的丟包率,并结合容错辅助信 息,对该源码流进行快速转码, 利用该容错辅助信息快速地生成符合后续网络 丟包特性的容错码流,针对丟包率变化快速地做出反应,根据实际的条件改变
5 码流的容错能力, 例如调整码流冗余率和 FEC保护力度等等。 编码处理模块 12 获取容错码流后,应用第一发送模块 13将容错码流通过目标传输网络发送给终 端设备或其他数据转发节点。
进一步地,编码处理模块 12可以根据容错辅助信息调整码流冗余率和 FEC 保护力度等, 具体可以通过编码处理模块 12所包括的至少一个的子模块完成,
L0 包括:
第一处理子模块 121用于根据源传输网络和目标传输网络各自的丟包率, 以及与源码流对应的容错辅助信息,对源码流中包括的多个数据帧进行自适应 冗余帧调整, 获取容错码流, 容错辅助信息包括与源传输网络和目标传输网络 各自的丟包率分别对应的冗余帧集合的描述信息,冗余帧集合用于标识源码流
L5 中的多个数据帧中需要生成冗余帧的数据帧,且描述信息表示的各个冗余帧集 合满足以下条件:低丟包率对应的冗余帧集合为高丟包率对应的冗余帧集合的 子集。本实施例不需要对码流进行高复杂度的转码,在数据转发节点存储每个 丟包率下的容错辅助信息,再利用该信息实现可伸缩的冗余分配。可以在有线 网络中传输编码效率最高的码流,在数据转发节点根据容错辅助信息, 快速的
>0 添加或删除冗余帧
第二处理子模块 122用于根据源传输网络和目标传输网络各自的丟包率, 以及与源码流对应的容错辅助信息,对源码流中各个数据源块进行前向纠错冗 余调整, 获取容错码流, 所述容错辅助信息包括与所述源传输网络和所述目标 传输网络各自的丟包率分别对应的前向纠错集合的前向纠错描述信息,所述前 向纠错集合包括分别对应于所述各个数据源块在不同丟包率下应分配的前向 纠错冗余, 且所述前向纠错描述信息表示的各个前向纠错集合满足以下条件:
5 低丟包率对应的前向纠错集合为高丟包率对应的前向纠错集合的子集。本发明 实施例的数据转发节点可以是流服务器、 媒体网关、 路由器等设备
本实施例提供的数据转发节点设备能够根据数据服务器发送的对应于数 据码流的容错辅助信息, 对需要进行转发的码流进行容错编码获得容错码流, 以适应后续传输网络丟包率的网络特性。 能够充分合理地利用网络资源,每次
L0 经历变化都可以快速地做出反应, 根据实际的条件改变码流的容错能力。
图 12为本发明网络设备实施例一结构示意图,如图 12所示, 该网络设备包 括第一获取模块 21和第二发送模块 22, 其中, 第一获取模块 21用于在向数据传 输网络系统发送源码流之前,根据数据传输网络系统中至少两个传输网络所对 应的丟包率, 获取与源码流对应的容错辅助信息, 容错辅助信息用于为数据传
L5 输网络系统中的数据转发节点对接收到的码流进行容错编码处理、以获取容错 码流提供参考; 第二发送模块 22用于向数据转发节点发送容错辅助信息。
具体地,网络设备在向数据传输网络系统中的某一数据转发节点发送视频 码流前, 要通过第一获取模块 21获取到所发送的源码流对应的容错辅助信息, 该容错辅助信息用于为数据传输网络系统中的数据转发节点对接收到的码流
>0 进行容错编码处理、以获取符合后续的传输网络对应丟包率的容错码流提供参 考,也就是说数据转发节点能够根据容错辅助信息,针对该数据转发节点后续 的传输网络的丟包率进行快速转码,利用该容错辅助信息快速地生成满足后续 网络丟包特性的容错码流。 第一获取模块 21获取到容错码流后, 通过第二发送 模块 22将容错辅助信息发送给数据传输网络系统中各数据转发节点,供数据转 发节点容错编码用。 该容错辅助信息可以是与附件在码流中携带或者单独发 送。 根据数据传输网络系统中至少两个传输网络所对应的丟包率,获取与要发送的 码流对应的容错辅助信息, 并将容错辅助信息发送给数据转发节点,使得数据 转发节点能够根据不同传输网络丟包率,利用该容错辅助信息快速地生成符合 后续传输网络丟包特性的容错码流,提高不同的网络丟包率环境下码流的容错 ίθ 能力。
图 13为本发明网络设备实施例二结构示意图,如图 13所示, 该网络设备包 括第一获取模块 21和第二发送模块 22,其中第一获取模块 21至少包括以下一个 子模块, 所述的子模块包括:
第一获取子模块 211用于根据数据传输网络系统中至少两个传输网络所对 L5 应的丟包率, 获取供数据转发节点对接收到的码流进行自适应冗余帧调整、 以 获取容错码流用的容错辅助信息,容错辅助信息包括与数据传输网络系统中至 少两个传输网络各自的丟包率分别对应的冗余帧集合的描述信息,冗余帧集合 用于标识码流中的多个数据帧中需要生成冗余帧的数据帧,且描述信息表示的 各个冗余帧集合满足以下条件:低丟包率对应的冗余帧集合为高丟包率对应的 >0 冗余帧集合的子集。
第二获取子模块 212用于根据数据传输网络系统中至少两个传输网络所对 应的丟包率,获取供数据转发节点对接收到的码流中各个数据源块进行前向纠 错冗余调整、 以获取容错码流用的容错辅助信息, 所述容错辅助信息包括与数 据传输网络系统中至少两个传输网络各自的丟包率分别对应的前向纠错集合 的前向糾错描述信息,所述前向糾错集合包括分别对应于所述各个数据源块在 不同丟包率下应分配的前向纠错冗余,且所述前向纠错描述信息表示的各个前 5 向纠错集合满足以下条件:低丟包率对应的前向纠错集合为高丟包率对应的前 向纠错集合的子集。
另夕卜,本实施例提供的网络设备中的第二发送模块 22还用于在根据与数据 转发节点之间的传输网络对应的丟包率以及容错辅助信息,生成与源码流对应 的容错码流后, 将容错码流和容错辅助信息一同发送给数据转发节点。 其根据数据传输网络系统中至少两个传输网络所对应的丟包率,获取与要发送 的码流对应的容错辅助信息, 使得数据转发节点能够根据不同传输网络丟包 不仅能够提高不同的网络丟包率环境下码流的容错能力, 而且延迟少,操作复 ί5 杂度低有利于实时应用。
图 14为本发明网络系统实施例组成示意图,如图 14所示, 该网络系统包括 网络设备 1、 数据转发节点设备 2和终端设备 3 , 其中, 数据转发节点设备 2用于 接收来自源传输网络发往目标传输网络的源码流,并根据所述源传输网络和所 述目标传输网络各自的丟包率, 以及与所述源码流对应的容错辅助信息,对所
>0 述源码流进行容错编码处理获取容错码流后,再向所述目标传输网络发送获取 到的所述容错码流; 网络设备 1 用于在向数据传输网络系统发送源码流之前, 才艮据所述数据传输网络系统中至少两个传输网络所对应的丟包率,获取与所述 源码流对应的容错辅助信息, 并向所述数据转发节点发送所述容错辅助信息; 所述容错辅助信息用于为所述数据传输网络系统中的数据转发节点对接收到 的码流进行容错编码处理、 以获取容错码流提供参考。
网络设备 1提供数据源, 数据转发节点设备 2用于对发往终端设备 3的数据
5 进行转发,每次经历变化都可以快速地做出反应,根据实际的条件改变码流的 容错能力, 利用该容错辅助信息快速地生成符合后续网络丟包特性的容错码 流。 网络系统还包括多个传输网络 4, 分别设置在网络设备 1、 数据转发节点设 备 2和终端设备 3之间, 用于为网络设备 1和数据转发节点设备 2, 以及数据转发 节点设备 2之间提供数据传输通道。 本实施例提供的网络系统中涉及的数据转
L0 发节点设备和网络设备,可以分别采用上述各实施例提供的数据转发节点设备 和网络设备, 其结构和功能请详见上述实施例描述, 此处不再赘述。 本发明实 施例的数据转发节点可以是流服务器、 媒体网关、 路由器等设备, 网络设备可 以为上述各实施例中涉及的数据服务器。
本实施例提供的网络系统中,网络设备能够根据数据传输网络系统中至少
L5 两个传输网络所对应的丟包率, 获取与要发送的码流对应的容错辅助信息,使 得数据转发节点能够根据不同传输网络丟包率,利用该容错辅助信息快速地生 成符合后续传输网络丟包特性的容错码流,不仅能够提高不同的网络丟包率环 境下码流的容错能力, 而且延迟少, 操作复杂度低有利于实时应用。
本领域普通技术人员可以理解:实现上述方法实施例的全部或部分步骤可
>0 以通过程序指令相关的硬件来完成,前述的程序可以存储于一计算机可读取存 储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述的存储 介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。 最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其限 制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术人员 应当理解: 其依然可以对前述各实施例所记载的技术方案进行修改,或者对其 中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技术方案的 本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求
1、 一种视频数据传输处理方法, 其特征在于, 包括:
接收来自源传输网络发往目标传输网络的源码流;
5 根据所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码 流对应的容错辅助信息, 对所述源码流进行容错编码处理, 获得容错码流; 向所述目标传输网络发送获取到的所述容错码流。
2、 根据权利要求 1所述的视频数据传输处理方法, 其特征在于, 所述容错 辅助信息包括与所述源传输网络和所述目标传输网络各自的丟包率分别对应
L0 的容错数据集合的描述信息,所述容错数据集合用于标识所述源码流中需要调 整的容错数据。
3、 根据权利要求 2所述的视频数据传输处理方法, 其特征在于, 所述描述 信息表示的各个容错数据集合满足以下条件:低丟包率对应的容错数据集合为 高丟包率对应的容错数据集合的子集。
L5 4、 根据权利要求 2或 3所述的视频数据传输处理方法, 其特征在于, 所述 根据所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码流对 应的容错辅助信息, 对所述源码流进行容错编码处理, 获得容错码流包括: 根据所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码 流对应的容错辅助信息,对所述源码流中包括的多个数据帧进行自适应冗余帧 >0 调整, 获得容错码流; 所述容错数据集合为用于标识所述源码流中的多个数据 帧中需要生成冗余帧的数据帧的冗余帧集合。
5、 根据权利要求 4所述的视频数据传输处理方法, 其特征在于, 所述根据 所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码流对应的 容错辅助信息, 对所述源码流中包括的多个数据帧进行自适应冗余帧调整包 括:
若所述源传输网络对应的第一丟包率小于所述目标传输网络对应的第二 5 丟包率, 则根据所述描述信息表示的、 与所述第一丟包率对应的第一冗余帧集 合和与所述第二丟包率对应的第二冗余帧集合,在携带有与所述第一丟包率对 应的冗余帧的所述源码流中,添加所述第二冗余帧集合比所述第一冗余帧集合 多出的冗余帧; 或
若所述源传输网络对应的第一丟包率大于所述目标传输网络对应的第二 L0 丟包率, 则根据所述描述信息表示的、 与所述第一丟包率对应的第一冗余帧集 合和与所述第二丟包率对应的第二冗余帧集合,在携带有与所述第一丟包率对 应的冗余帧的所述源码流中,丟弃所述第一冗余帧集合比所述第二冗余帧集合 多出的冗余帧。
6、 根据权利要求 2或 3所述的视频数据传输处理方法, 其特征在于, 所述 L5 根据所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码流对 应的容错辅助信息, 对所述源码流进行容错编码处理, 获得容错码流包括: 根据所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码 流对应的容错辅助信息, 对所述源码流中各个数据源块进行前向糾错冗余调 整, 获取容错码流; 所述容错数据集合为前向纠错集合, 所述前向纠错集合包 >0 括分别对应于所述各个数据源块在不同丟包率下应分配的前向纠错描述信息。
7、 根据权利要求 6所述的视频数据传输处理方法, 其特征在于, 所述根据 所述源传输网络和所述目标传输网络各自的丟包率,以及与所述源码流对应的 容错辅助信息, 对所述源码流中各个数据源块进行前向纠错冗余调整包括: 若所述源传输网络对应的第一丟包率小于所述目标传输网络对应的第二 丟包率, 则根据所述前向纠错描述信息,在所述源码流中各个数据源块所携带 的前向纠错冗余的基础上, 增加对应的前向纠错冗余; 或
5 若所述源传输网络对应的第一丟包率大于所述目标传输网络对应的第二 丟包率, 则根据所述前向纠错描述信息,在所述源码流中各个数据源块所携带 的前向纠错冗余的基础上, 丟弃对应的前向纠错冗余。
8、 根据权利要求 1或 2或 3所述的视频数据传输处理方法, 其特征在于, 所 述方法还包括:
L0 与所述容错码流一起或单独转发所述容错辅助信息。
9、 一种视频数据发送处理方法, 其特征在于, 包括:
在向数据传输网络系统发送源码流之前,根据所述数据传输网络系统中至 少两个传输网络所对应的丟包率, 获取与所述源码流对应的容错辅助信息; 所 述容错辅助信息用于为所述数据传输网络系统中的数据转发节点对接收到的 L5 码流进行容错编码处理、 以获取容错码流提供参考;
向所述数据转发节点发送所述容错辅助信息。
10、 根据权利要求 9所述的视频数据发送处理方法, 其特征在于, 所述向 所述数据转发节点发送所述容错辅助信息包括:
在根据与所述数据转发节点之间的传输网络对应的丟包率以及所述容错
>0 辅助信息, 生成与所述源码流对应的容错码流后, 将所述容错码流和所述容错 辅助信息发送给所述数据转发节点。
11、 根据权利要求 9所述的视频数据发送处理方法, 其特征在于, 所述容 错辅助信息包括与所述数据传输网络系统中至少两个传输网络各自的丟包率 分别对应的容错数据集合的描述信息,所述容错数据集合用于标识所述源码流 中需要调整的容错数据。
12、 根据权利要求 11所述的视频数据发送处理方法, 其特征在于, 所述描 5 述信息表示的各个容错数据集合满足以下条件:低丟包率对应的容错数据集合 为高丟包率对应的容错数据集合的子集。
13、 根据权利要求 11或 12所述的视频数据发送处理方法, 其特征在于, 所 述根据所述数据传输网络系统中至少两个传输网络所对应的丟包率,获取与所 述源码流对应的容错辅助信息包括:
L0 才艮据所述数据传输网络系统中至少两个传输网络所对应的丟包率,获取供 所述数据转发节点对接收到的码流进行自适应冗余帧调整、以获取容错码流用 的容错辅助信息,所述容错数据集合为用于标识所述源码流中的多个数据帧中 需要生成冗余帧的数据帧的冗余帧集合; 或
根据所述数据传输网络系统中至少两个传输网络所对应的丟包率,获取供
L5 所述数据转发节点对接收到的码流中各个数据源块进行前向纠错冗余调整、以 获取容错码流用的容错辅助信息, 所述容错数据集合为前向纠错集合, 所述前 向纠错集合包括分别对应于所述各个数据源块在不同丟包率下应分配的前向 纠错描述信息。
14、 根据权利要求 13所述的视频数据发送处理方法, 其特征在于, 所述根 >0 据所述数据传输网络系统中至少两个传输网络所对应的丟包率,获取供所述数 据转发节点对接收到的码流进行自适应冗余帧调整、以获取容错码流用的容错 辅助信息包括: 针对所述至少两个丟包率,分别在不生成冗余帧以及生成冗余帧的两种情 况下, 对所述码流中各数据帧对应的两组信源信道失真信息进行计算;
应用率失真模型,对计算获得的两组信源信道失真信息所对应的数据帧在 对应的丟包率条件下是否需要生成冗余帧进行判断, 获得判断结果;
5 根据所述判断结果,获得所述与所述至少两个丟包率分别对应的冗余帧集 合的描述信息。
15、 一种数据转发节点设备, 其特征在于, 包括:
第一接收模块, 用于接收来自源传输网络发往目标传输网络的源码流; 编码处理模块,用于根据所述源传输网络和所述目标传输网络各自的丟包 L0 率,以及与所述源码流对应的容错辅助信息,对所述源码流进行容错编码处理, 获得容错码流;
第一发送模块, 用于向所述目标传输网络发送获取到的所述容错码流。
16、 根据权利要求 15所述的数据转发节点设备, 其特征在于, 所述编码处 理模块包括:
L5 第一处理子模块,用于根据所述源传输网络和所述目标传输网络各自的丟 包率, 以及与所述源码流对应的容错辅助信息,对所述源码流中包括的多个数 据帧进行自适应冗余帧调整, 获取容错码流, 所述容错辅助信息包括与所述源 传输网络和所述目标传输网络各自的丟包率分别对应的冗余帧集合的描述信 息,所述冗余帧集合用于标识所述源码流中的多个数据帧中需要生成冗余帧的
>0 数据帧; 或
第二处理子模块,用于根据所述源传输网络和所述目标传输网络各自的丟 包率, 以及与所述源码流对应的容错辅助信息,对所述源码流中各个数据源块 进行前向糾错冗余调整, 获取容错码流, 所述容错辅助信息包括与所述源传输 网络和所述目标传输网络各自的丟包率分别对应的前向纠错集合的前向纠错 描述信息,所述前向纠错集合包括分别对应于所述各个数据源块在不同丟包率 下应分配的前向纠错冗余。
5 17、 根据权利要求 16所述的数据转发节点设备, 其特征在于, 所述描述信 息表示的各个冗余帧集合满足以下条件:低丟包率对应的冗余帧集合为高丟包 率对应的冗余帧集合的子集; 或者
所述前向纠错描述信息表示的各个前向纠错集合满足以下条件:低丟包率 对应的前向纠错集合为高丟包率对应的前向纠错集合的子集。
L0
18、 一种网络设备, 其特征在于, 包括:
第一获取模块, 用于在向数据传输网络系统发送源码流之前,根据所述数 据传输网络系统中至少两个传输网络所对应的丟包率,获取与所述源码流对应 的容错辅助信息;所述容错辅助信息用于为所述数据传输网络系统中的数据转 发节点对接收到的码流进行容错编码处理、 以获取容错码流提供参考;
L5 第二发送模块, 用于向所述数据转发节点发送所述容错辅助信息。
19、 根据权利要求 18所述的网络设备, 其特征在于, 所述第一获取模块包 括:
第一获取子模块,用于根据所述数据传输网络系统中至少两个传输网络所 对应的丟包率,获取供所述数据转发节点对接收到的码流进行自适应冗余帧调 >0 整、 以获取容错码流用的容错辅助信息, 所述容错辅助信息包括与所述数据传 输网络系统中至少两个传输网络各自的丟包率分别对应的冗余帧集合的描述 信息,所述冗余帧集合用于标识所述码流中的多个数据帧中需要生成冗余帧的 数据帧; 或
第二获取子模块,用于根据所述数据传输网络系统中至少两个传输网络所 对应的丟包率,获取供所述数据转发节点对接收到的码流中各个数据源块进行 前向纠错冗余调整、 以获取容错码流用的容错辅助信息, 所述容错辅助信息包 5 括与所述数据传输网络系统中至少两个传输网络各自的丟包率分别对应的前 向纠错集合的前向纠错描述信息,所述前向纠错集合包括分别对应于所述各个 数据源块在不同丟包率下应分配的前向纠错冗余。
20、 根据权利要求 19所述的网络设备, 其特征在于, 所述描述信息表示的 各个冗余帧集合满足以下条件:低丟包率对应的冗余帧集合为高丟包率对应的
L0 冗余帧集合的子集; 或者
所述前向纠错描述信息表示的各个前向纠错集合满足以下条件:低丟包率 对应的前向纠错集合为高丟包率对应的前向纠错集合的子集。
21、 一种网络系统, 其特征在于, 包括:
数据转发节点设备, 用于接收来自源传输网络发往目标传输网络的源码 L5 流,根据所述源传输网络和所述目标传输网络各自的丟包率, 以及与所述源码 流对应的容错辅助信息,对所述源码流进行容错编码处理获取容错码流后, 向 所述目标传输网络发送获取到的所述容错码流;
网络设备, 用于在向数据传输网络系统发送源码流之前, 根据所述数据 传输网络系统中至少两个传输网络所对应的丟包率,获取与所述源码流对应的 >0 容错辅助信息, 向所述数据转发节点设备发送所述容错辅助信息; 所述容错辅 助信息用于为所述数据传输网络系统中的数据转发节点设备对接收到的码流 进行容错编码处理、 以获取容错码流提供参考。
PCT/CN2010/077526 2009-09-30 2010-09-30 视频数据传输处理、发送处理方法、装置和网络系统 WO2011038694A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10819923.3A EP2472873B8 (en) 2009-09-30 2010-09-30 Method, device and network system for transmission processing and sending processing of video data
US13/434,400 US9215498B2 (en) 2009-09-30 2012-03-29 Video data transmission processing method, video data sending processing method, apparatus, network system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200910179726.5 2009-09-30
CN2009101797265A CN102036061B (zh) 2009-09-30 2009-09-30 视频数据传输处理、发送处理方法、装置和网络系统

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/434,400 Continuation US9215498B2 (en) 2009-09-30 2012-03-29 Video data transmission processing method, video data sending processing method, apparatus, network system

Publications (1)

Publication Number Publication Date
WO2011038694A1 true WO2011038694A1 (zh) 2011-04-07

Family

ID=43825589

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2010/077526 WO2011038694A1 (zh) 2009-09-30 2010-09-30 视频数据传输处理、发送处理方法、装置和网络系统

Country Status (4)

Country Link
US (1) US9215498B2 (zh)
EP (1) EP2472873B8 (zh)
CN (1) CN102036061B (zh)
WO (1) WO2011038694A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9215498B2 (en) 2009-09-30 2015-12-15 Huawei Technologies Co., Ltd. Video data transmission processing method, video data sending processing method, apparatus, network system

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8365046B2 (en) * 2010-11-23 2013-01-29 Lsi Corporation Method and apparatus for non-uniform redundancy packet error correction
CN102438152B (zh) * 2011-12-29 2013-06-19 中国科学技术大学 可伸缩视频编码容错传输方法、编码器、装置和系统
US9438483B2 (en) 2012-10-15 2016-09-06 At&T Intellectual Property I, L.P. System and method of implementing quality of service over a packet-based Network
KR102173084B1 (ko) * 2013-08-23 2020-11-02 삼성전자주식회사 무선 통신 시스템에서 데이터 패킷 송수신 방법 및 장치
US20150100622A1 (en) * 2013-10-04 2015-04-09 Comcast Cable Communications, Llc Network Device Mediation
US9582904B2 (en) 2013-11-11 2017-02-28 Amazon Technologies, Inc. Image composition based on remote object data
US9596280B2 (en) 2013-11-11 2017-03-14 Amazon Technologies, Inc. Multiple stream content presentation
US9641592B2 (en) 2013-11-11 2017-05-02 Amazon Technologies, Inc. Location of actor resources
US9578074B2 (en) * 2013-11-11 2017-02-21 Amazon Technologies, Inc. Adaptive content transmission
US9604139B2 (en) 2013-11-11 2017-03-28 Amazon Technologies, Inc. Service for generating graphics object data
US9805479B2 (en) 2013-11-11 2017-10-31 Amazon Technologies, Inc. Session idle optimization for streaming server
US9634942B2 (en) 2013-11-11 2017-04-25 Amazon Technologies, Inc. Adaptive scene complexity based on service quality
US9282133B2 (en) 2013-12-12 2016-03-08 Ooma, Inc. Communicating control information within a real-time stream
US9280413B2 (en) * 2013-12-12 2016-03-08 Talkatone, Llc Redundant encoding
EP3130100B1 (de) * 2014-04-09 2021-10-20 Hirschmann Automation and Control GmbH Verfahren für ein redundantes übertragungssystem mit prp und fehlvorhersage
CN104113395B (zh) * 2014-08-04 2017-05-17 北京水木云科信息技术有限公司 一种无线恶劣网络环境下物联网数据安全传输的方法
US9900643B2 (en) * 2014-10-10 2018-02-20 At&T Intellectual Property I, L.P. Method and apparatus for transmitting media content
US9992126B1 (en) 2014-11-07 2018-06-05 Speedy Packets, Inc. Packet coding based network communication
US9992088B1 (en) 2014-11-07 2018-06-05 Speedy Packets, Inc. Packet coding based network communication
US10999012B2 (en) 2014-11-07 2021-05-04 Strong Force Iot Portfolio 2016, Llc Packet coding based network communication
US9825733B1 (en) 2014-11-07 2017-11-21 Speedy Packets, Inc. Packet coding based network communication
US10320526B1 (en) 2014-11-07 2019-06-11 Strong Force Iot Portfolio 2016, Llc Packet coding based network communication
US10530700B2 (en) 2015-07-07 2020-01-07 Strong Force Iot Portfolio 2016, Llc Message reordering timers
US10097608B2 (en) * 2015-12-26 2018-10-09 Intel Corporation Technologies for wireless transmission of digital media
CN107181968B (zh) * 2016-03-11 2019-11-19 腾讯科技(深圳)有限公司 一种视频数据的冗余控制方法和装置
WO2018042885A1 (ja) * 2016-08-30 2018-03-08 日本電気株式会社 送信端末、送信方法および送信プログラム
JP6782148B2 (ja) * 2016-10-21 2020-11-11 株式会社日立製作所 通信端末
CN108093298A (zh) * 2016-11-21 2018-05-29 松下知识产权经营株式会社 影像传输系统
CN110198474B (zh) 2018-02-27 2022-03-15 中兴通讯股份有限公司 一种码流处理方法及装置
CN109168092A (zh) * 2018-09-17 2019-01-08 深圳市网心科技有限公司 流媒体数据传输状态判定方法、节点、系统及存储介质
CN110445579B (zh) * 2019-07-31 2022-03-15 广州小鹏汽车科技有限公司 数据处理方法、数据处理装置、车载终端、车辆和介质
CN112820306B (zh) * 2020-02-20 2023-08-15 腾讯科技(深圳)有限公司 语音传输方法、系统、装置、计算机可读存储介质和设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005151600A (ja) * 2000-10-31 2005-06-09 Toshiba Corp データ伝送装置、データ伝送方法及びプログラム
CN101155311A (zh) * 2006-09-27 2008-04-02 中兴通讯股份有限公司 一种视频通信中的视频码流错误检测和处理方法
US20090138784A1 (en) * 2007-11-13 2009-05-28 Fujitsu Limited Coding device and coding method

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6233283B1 (en) * 1998-06-23 2001-05-15 Lucent Technologies Inc. Layered video coding using perceptual coding criteria for error resilience in packet networks
US6498865B1 (en) 1999-02-11 2002-12-24 Packetvideo Corp,. Method and device for control and compatible delivery of digitally compressed visual data in a heterogeneous communication network
US6339450B1 (en) * 1999-09-21 2002-01-15 At&T Corp Error resilient transcoding for video over wireless channels
JP3699910B2 (ja) * 2000-10-31 2005-09-28 株式会社東芝 データ伝送装置、データ伝送方法及びプログラム
JP3769468B2 (ja) * 2001-03-21 2006-04-26 株式会社エヌ・ティ・ティ・ドコモ 通信品質制御方法、通信品質制御システム、パケット解析装置及びデータ送信端末装置
US7239662B2 (en) 2001-08-23 2007-07-03 Polycom, Inc. System and method for video error concealment
US8964830B2 (en) * 2002-12-10 2015-02-24 Ol2, Inc. System and method for multi-stream video compression using multiple encoding formats
US8526490B2 (en) * 2002-12-10 2013-09-03 Ol2, Inc. System and method for video compression using feedback including data related to the successful receipt of video content
CN101030832B (zh) * 2006-03-03 2011-08-10 华为技术有限公司 实现实时传输协议报文冗余机制的方法及其系统
US20080148327A1 (en) * 2006-12-18 2008-06-19 General Instrument Corporation Method and Apparatus for Providing Adaptive Trick Play Control of Streaming Digital Video
CN100571399C (zh) * 2006-12-30 2009-12-16 清华大学 基于多参考预测链编码的无线视频传输方法
CN101072083A (zh) * 2007-06-04 2007-11-14 深圳市融合视讯科技有限公司 一种优化网络数据传输冗余纠错率的方法
JP4434242B2 (ja) * 2007-07-11 2010-03-17 ソニー株式会社 送信装置、受信装置、誤り訂正システム、送信方法及び誤り訂正方法
US8958486B2 (en) * 2007-07-31 2015-02-17 Cisco Technology, Inc. Simultaneous processing of media and redundancy streams for mitigating impairments
CN101252425B (zh) * 2008-04-09 2010-10-27 杭州华三通信技术有限公司 一种自动适应网络的丢包纠错方法和系统
US9571225B2 (en) * 2009-07-08 2017-02-14 Google Technology Holdings LLC Method and apparatus for optimizing target error rates for link adaptation in a communication system
CN102036061B (zh) 2009-09-30 2012-11-21 华为技术有限公司 视频数据传输处理、发送处理方法、装置和网络系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005151600A (ja) * 2000-10-31 2005-06-09 Toshiba Corp データ伝送装置、データ伝送方法及びプログラム
CN101155311A (zh) * 2006-09-27 2008-04-02 中兴通讯股份有限公司 一种视频通信中的视频码流错误检测和处理方法
US20090138784A1 (en) * 2007-11-13 2009-05-28 Fujitsu Limited Coding device and coding method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9215498B2 (en) 2009-09-30 2015-12-15 Huawei Technologies Co., Ltd. Video data transmission processing method, video data sending processing method, apparatus, network system

Also Published As

Publication number Publication date
EP2472873B1 (en) 2017-05-10
CN102036061B (zh) 2012-11-21
US20120192031A1 (en) 2012-07-26
EP2472873B8 (en) 2017-08-30
US9215498B2 (en) 2015-12-15
EP2472873A1 (en) 2012-07-04
EP2472873A4 (en) 2012-11-14
CN102036061A (zh) 2011-04-27

Similar Documents

Publication Publication Date Title
WO2011038694A1 (zh) 视频数据传输处理、发送处理方法、装置和网络系统
TWI406572B (zh) 運用即時回傳資訊與封包重傳可適應機制之錯誤復原的視訊傳輸系統
JP5069099B2 (ja) 時間スケーラビリティを可能にするハイブリッド映像圧縮におけるフレーム予測のための方法および装置
JP4753204B2 (ja) 符号化処理装置および符号化処理方法
JP5533435B2 (ja) 画像データ配信制御方法及び装置とシステムならびにプログラム
KR20080015831A (ko) 다층 비디오 설계를 위한 레이트 제어
JP5207895B2 (ja) 送信装置、受信装置、及び方法、プログラム
WO2012000263A1 (zh) 一种片段头信息中量化参数的编解码方法和装置
WO2008095345A1 (en) A method for encoding a video sequence and a error remedying system using same
WO2002005566A1 (en) Image coding apparatus and image coding method
JPH0984019A (ja) 画像データ蓄積装置
US20060015799A1 (en) Proxy-based error tracking for real-time video transmission in mobile environments
TW201330625A (zh) 用於數位視訊處理的裝置及方法
Chen et al. Robust video streaming over wireless LANs using multiple description transcoding and prioritized retransmission
JP4596164B2 (ja) 画像データ通信システムおよび画像データ通信方法
Nikzad et al. Performance evaluation of error control schemes for distributed video coding over wireless multimedia sensor networks
Ha et al. Packet loss resilience using unequal forward error correction assignment for video transmission over communication networks
Sun et al. An novel loss protection scheme for H. 264 video stream based on frame error propagation index
TWI683572B (zh) 基於畫面動態資訊的視訊位元率傳輸控制方法
KR101072626B1 (ko) 비트율 제어 방법과 장치 및 이를 이용한 분산 비디오 코딩 방법과 장치
KR100926826B1 (ko) 비디오 비트열의 전송 오류에 대비하기 위한 변환부호장치 및 방법
CN107835422B (zh) 一种基于显著性的hevc多描述图像编码算法
KR100961756B1 (ko) 적응적인 부가 영상 정보를 활용한 오류 강인 부호화 방법
Le Léannec et al. Packet loss resisilent H. 263+ compliant video coding
Zhang et al. Scalable video coding algorithm and rate-distortion optimisation based on cloud computing

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10819923

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2010819923

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2010819923

Country of ref document: EP