WO2010015142A1 - 一种实现零拷贝发送流媒体数据的方法及系统 - Google Patents
一种实现零拷贝发送流媒体数据的方法及系统 Download PDFInfo
- Publication number
- WO2010015142A1 WO2010015142A1 PCT/CN2009/000852 CN2009000852W WO2010015142A1 WO 2010015142 A1 WO2010015142 A1 WO 2010015142A1 CN 2009000852 W CN2009000852 W CN 2009000852W WO 2010015142 A1 WO2010015142 A1 WO 2010015142A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- streaming media
- data
- media data
- user
- real
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/232—Content retrieval operation locally within server, e.g. reading video streams from disk arrays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
Definitions
- the invention relates to a network communication method and system in the field of computer application, and particularly relates to a method and system for implementing zero-copy transmission of streaming media data by a Linux-based network protocol stack.
- the process of delivery mainly includes the following three parts: (1) reading the streaming media data from the disk space into the user data cache; (2) packaging the streaming media data stored in the user data cache into RTP (Real-time Transport Protocol, The real-time transport protocol) data packet is stored in the user send buffer; (3) the RTP data packet stored in the user send buffer is sent out through a UDP (User Datagram Protocol) network socket.
- RTP Real-time Transport Protocol
- UDP User Datagram Protocol
- the user process can read the disk data through the direct input and output interface system call, and the system call directly writes the disk data to the user cache through the DMA (Direct Memory Access) mechanism;
- the network socket related system call interface can send an RTP data packet, and the system call copies the RTP data packet from the user space to the kernel space, performs corresponding encapsulation, and maps to the transmission buffer of the network card through the DMA mechanism, and the network card will RTP packets are sent out.
- the user process can read the streaming media data from the disk to achieve zero copy, but the streaming media data is packaged into the RTP data packet, and the data is copied.
- the RTP data packet needs to be User space is copied to the kernel space.
- the object of the present invention is to provide a method and system for implementing zero-copy transmission of streaming media data.
- the method and system are based on a Linux network protocol stack, and minimize data copy without affecting the original network protocol stack of the Linux system. And CPU consumption caused by system calls, improve the processing power of the system.
- the technical solution of the present invention includes:
- a method for implementing zero-copy transmission of streaming media data, a Linux-based network protocol stack comprising the following steps:
- the streaming media server when the streaming media server receives the data request of the user equipment, performs a system call for sending data, and reads the streaming media data from the disk space into the user data cache;
- the streaming media data stored in the user data cache is packaged into a real-time transport protocol data packet, and the real-time transport protocol data packet is sent in the form of a stream media packet separated by a header and a payload.
- step B further includes:
- a kernel buffer structure is allocated in the kernel space for each real-time transport protocol data packet to be sent, and the structure is composed of two parts: a part is a temporarily allocated kernel buffer, and includes a header of the real-time transport protocol data packet. The other part is a temporarily mapped user buffer containing the payload of the real-time transport protocol packet;
- one streaming media data packet is sent to each user by one system call.
- the network protocol stack provides the following socket programming interface: a socket for creating a socket, used to close the close of the socket, and used to implement a zero copy sending stream.
- a system for implementing zero-copy transmission of streaming media data comprising a streaming media server, the streaming media server being configured to implement a zero-copy transmission of streaming media data based on a Linux-based network protocol stack.
- the streaming media server sets a kernel space between the hardware device and the user process, and a network protocol stack is set on the network card driver in the kernel space; the kernel space is formed by packaging the streaming media data to be sent.
- Real-time transport protocol packet allocation :
- the network protocol stack provides a socket programming interface to a user process, and the socket programming interface includes: a socket, a close for closing a socket, a sendmsg for implementing zero-copy transmission of streaming media data; the network protocol stack is configured to implement streaming media packets separated by a header and a payload for real-time transport protocol data packets The form is sent.
- the streaming media server uses a batch sending technology to send multiple data packets in one sendmsg system call.
- the invention provides a method and a system for realizing zero-copy transmission of streaming media data, which fully utilizes the DMA function of the network card and the SG (Scatter/Gather) function to realize zero-copy transmission of streaming media data, and Compared with the existing network protocol stack of the Linux kernel, the streaming media data packet with header and load separation is implemented, and the data copy operation required for the RTP packaging process of the streaming media data is reduced.
- FIG. 1 is a schematic diagram of a zero-copy transmission of streaming media data by a network protocol stack implemented by the present invention
- Figure 2 is a schematic view showing the structure of the system of the present invention.
- the original Linux network protocol stack is utilized, and the network protocol stack is implemented by using a kernel module mechanism, and the loading and unloading of the kernel module does not affect the original network protocol stack of the Linux kernel.
- the system for implementing zero-copy transmission of streaming media data includes a streaming media server. As shown in FIG. 2, the streaming media server is provided with a network card and a communication connection with the user equipment. The network card supports DMA function and SG (Scatter/Gather) function.
- the hardware device of the streaming media server includes a network card and a hard disk.
- a network card between the hardware device and the user process is a Linux kernel space, and the network card driver in the kernel space.
- a network protocol stack is disposed on the network protocol stack, and the network protocol stack provides a socket programming interface to the user process.
- the socket programming interface mainly includes system calls such as socket, close, sendmsg, etc., wherein the socket is used to create a socket. Close is used to close the socket, sendmsg is used to implement zero-copy send streaming data.
- the hardware environment of the method and system of the present invention requires the network card to have a DMA function and an SG function, and the software environment is a Linux kernel with a normal network function.
- the method and system of the present invention creates a DATALINK network protocol stack based on the AF-DATALINK socket type based on the original Linux kernel.
- the protocol stack provides the user process with an AF DATALINK type socket programming interface, including socket, close, sendmsg and other system calls.
- the socket system call is used to create the socket
- the close system call is used to close the socket
- the sendmsg system call is used to send the streaming media data in RTP packet encapsulation in a zero-copy manner.
- the streaming media data is sent through a zero copy of the socket.
- Socket uses the AF-DATALINK socket created by the socket system call
- Msg->msg_namelen is not used for the time being.
- Msg->msg_iov Input parameters Pointer to the struct iovec array.
- Each struct The iovec structure contains the buffer address and length of the data to be sent.
- Msg->msg_iovlen Input parameters Used to store the length of the struct iovec array pointed to by msg iov.
- Msg->msg control Input and output parameters.
- Input control information for each streaming media packet including IP address, UDP port, RTP payload type, etc.; used to return the index and error code of the sent error packet.
- Msg->msg_controllen Input parameters The total length used to store msg-control information. Msg -> msg - flags are not used temporarily.
- the number of successfully transmitted data packets is returned, and the index of the data packet that has not been successfully transmitted and the corresponding error code are returned through the output parameters.
- the information constituting the RTP data packet is stored in the parameter msg, and the msg_iov field stores the payload information of the RTP data packet to be transmitted, including the address and length information of the user data buffer, as the payload of the RTP data packet; msg_control field storage
- the header information of the RTP packet to be sent includes an IP address, a port number, an RTP payload type, and the like, and is used to generate a header of the RTP packet.
- the method of the present invention allocates a kernel buffer structure sk_buff for each RTP data packet to be sent in the kernel space when the sendmsg system is invoked, and the data of the structure is composed of two parts: a part is temporarily allocated.
- the kernel buffer which contains the header of the streaming RTP packet, is generated based on the header information contained in the msg-control; the other is the temporarily mapped user buffer, which contains the payload of the RTP packet, based on msg—
- the load information contained in iov is obtained.
- the two buffers are respectively mapped to the transmission buffer of the network card, and the transmission function of the network card driver module is called to complete zero-copy transmission of the streaming media data.
- the above mapping process is well known in the prior art and will not be described here.
- the streaming server of the method and system of the present invention can achieve zero copy transmission of streaming media data by using an AF DATALINK socket and a sendmsg system call when processing a single user request.
- the streaming server When the streaming server needs to process multiple user requests, it can send streaming media data with zero copy, similar to a single user request, and can be further optimized by reducing the number of system calls.
- System performance This is mainly due to the semantic redefinition of the parameter msg of the sendmsg system call. Its member msg->msg_iov points to a batch of packet buffers, and the member msg->msg_iovlen represents the packet buffer. The number, such a system call can send a batch of streaming media packets. In practical applications, a streaming media packet can be sent to each user in a sendmsg system call to reduce the number of sendmsg system calls and optimize system performance.
- the method and system of the invention fully utilizes the DMA function and the SG function of the network card, and realizes zero-copy transmission of streaming media data.
- the method and system of the present invention utilize the SG function of the network card to implement The transmission of the streaming media packets separated by the header and the payload reduces the data copying operation required for the RTP packaging process of the streaming media data.
- the network card driver module directly uses the user buffer area to transmit data packets, and reduces the data copy operation required to copy the streaming media data from the user space to the kernel space.
- the method and system of the invention also adopts the batch sending technology, realizes the function of sending a batch of data packets by one system call, avoids the situation that a system call is needed to send one data packet, and reduces the system when sending streaming media data to multiple users.
- the cost of the call is also known to those skilled in the art, and therefore will not be described again.
- the method and system of the invention fully utilizes the DMA function and the SG function of the network card, and realizes zero-copy transmission of streaming media data.
- the method and system of the present invention utilize the SG function of the network card to implement The transmission of the streaming media packets separated by the header and the payload reduces the data copying operation required for the RTP packaging process of the streaming media data.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Communication Control (AREA)
- Computer And Data Communications (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2011107517/08A RU2477930C2 (ru) | 2008-08-04 | 2009-07-30 | Способ и система для передачи потоковых мультимедийных данных с нулевым копированием |
EP09804442.3A EP2312807B1 (en) | 2008-08-04 | 2009-07-30 | Method and system for enabling zero-copy transmission of streaming media data |
US13/057,625 US20110258337A1 (en) | 2008-08-04 | 2009-07-30 | Method and system for enabling zero-copy transmission of streaming media data |
PL09804442T PL2312807T3 (pl) | 2008-08-04 | 2009-07-30 | Sposób i system umożliwiający transmisję danych mediów strumieniowych bez kopiowania |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 200810142292 CN101340574B (zh) | 2008-08-04 | 2008-08-04 | 一种实现零拷贝发送流媒体数据的方法及系统 |
CN200810142292.7 | 2008-08-04 | ||
CN200810241596.9 | 2008-12-26 | ||
CN 200810241596 CN101465854B (zh) | 2008-12-26 | 2008-12-26 | 一种媒体服务器及实现准实时发送媒体数据的方法 |
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WO2010015142A1 true WO2010015142A1 (zh) | 2010-02-11 |
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PCT/CN2009/000852 WO2010015142A1 (zh) | 2008-08-04 | 2009-07-30 | 一种实现零拷贝发送流媒体数据的方法及系统 |
Country Status (5)
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US (1) | US20110258337A1 (zh) |
EP (1) | EP2312807B1 (zh) |
PL (1) | PL2312807T3 (zh) |
RU (1) | RU2477930C2 (zh) |
WO (1) | WO2010015142A1 (zh) |
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Also Published As
Publication number | Publication date |
---|---|
EP2312807A1 (en) | 2011-04-20 |
EP2312807B1 (en) | 2018-11-14 |
EP2312807A4 (en) | 2016-12-14 |
RU2477930C2 (ru) | 2013-03-20 |
PL2312807T3 (pl) | 2019-04-30 |
US20110258337A1 (en) | 2011-10-20 |
RU2011107517A (ru) | 2012-09-10 |
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