WO2011022868A1 - 频道切换方法、装置和系统 - Google Patents

频道切换方法、装置和系统 Download PDF

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Publication number
WO2011022868A1
WO2011022868A1 PCT/CN2009/073448 CN2009073448W WO2011022868A1 WO 2011022868 A1 WO2011022868 A1 WO 2011022868A1 CN 2009073448 W CN2009073448 W CN 2009073448W WO 2011022868 A1 WO2011022868 A1 WO 2011022868A1
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WO
WIPO (PCT)
Prior art keywords
transmission protocol
program
specific information
media data
actual transmission
Prior art date
Application number
PCT/CN2009/073448
Other languages
English (en)
French (fr)
Inventor
刘相平
向海洲
吴杏芬
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 JP2012518724A priority Critical patent/JP5376350B2/ja
Priority to EP09848600A priority patent/EP2429238A4/en
Priority to PCT/CN2009/073448 priority patent/WO2011022868A1/zh
Priority to CN2009801480696A priority patent/CN102160415A/zh
Publication of WO2011022868A1 publication Critical patent/WO2011022868A1/zh
Priority to US13/338,767 priority patent/US20120099588A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/63Control 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
    • H04N21/643Communication protocols
    • H04N21/6437Real-time Transport Protocol [RTP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60Network streaming of media packets
    • H04L65/65Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • 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
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2362Generation or processing of Service Information [SI]
    • 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
    • H04N21/2381Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
    • 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
    • H04N21/4383Accessing a communication channel
    • H04N21/4384Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80Responding to QoS

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a channel switching technique.
  • the terminal device After receiving the channel switching response sent by the network side (such as the server) for the channel switching request, the terminal device needs to use the Program Specific push from the network side.
  • PSI Program Specific Information
  • a channel switching method is: PSI periodically appears in the media data stream, and the period is generally 500 ms.
  • the channel switching server does not perform processing operations such as identifying the PSI in the received media data stream.
  • the channel switching server pushes the identified key frame to the terminal device, and the terminal device receives the key frame and receives the received media.
  • the PSI is identified in the data stream, and then the terminal device decodes the key frame by using the identified PSI to implement channel switching.
  • the above key frames may be Indepe ndent Decoding Refresh (IDR) frames or Intra (I frames) depending on the encoding method.
  • the channel switching server can extract PS from the received media data stream.
  • RTCP Real Transmission Control Protocol
  • key frames in the network will have different transmission delays, therefore, PSI and media data arrive
  • the time of the terminal device will also be different.
  • the PSI may arrive at the terminal device later than the media data.
  • the terminal device may discard the PSI that arrives late, so that the terminal device cannot decode the media data received by the terminal device, causing the screen to be stagnant or stagnant or black. Phenomenon;
  • the terminal device waits for the PSI to affect the channel switching delay.
  • Embodiments of the present invention provide a channel switching method, apparatus, and system, which can ensure that program-specific information arrives at a terminal device prior to media data, thereby avoiding a screen or stagnant or black screen that occurs due to failure to decode the media data. Phenomenon, and, also, the effect of program-specific information on channel switching delays is avoided.
  • the channel switching method provided by the embodiment of the present invention includes:
  • the program-specific information for decoding the media data is reorganized into a real-transmission protocol packet, and the stream feature of the real-transmission protocol packet and the real-time carrying the media data ⁇
  • the transport stream message has the same stream characteristics
  • a channel switching apparatus includes:
  • the first handover processing module is configured to reassemble the program specific information used for decoding the media data stream into a real transmission protocol packet, and the flow characteristics of the real transmission protocol packet in the channel switching process The same flow characteristics as the actual transmission protocol message carrying the media data;
  • the first sending module is configured to send, to the terminal device, the actual transmission protocol packet carrying the program-specific information, and send the actual transmission protocol packet carrying the media data to the terminal device.
  • a channel switching system provided by an embodiment of the present invention includes:
  • the server is configured to recombine the program-specific information used for decoding the media data stream into a real-transmission protocol packet during the channel switching process, where the flow characteristics and carrying of the actual transmission protocol packet are The actual transmission protocol packet of the media data has the same flow characteristics; the server sends the actual transmission protocol packet carrying the program-specific information, and sends the actual transmission protocol packet carrying the media data.
  • the terminal device is configured to obtain program specific information from the received actual transmission protocol message, and decode the media data carried in the received real transmission protocol message by using the program specific information.
  • Another channel switching method provided by the embodiment of the present invention includes:
  • the transport stream packet containing the program-specific information is obtained from the stored information, and is reorganized into a real transport protocol packet;
  • a channel switching apparatus includes:
  • acquiring a transport stream packet module configured to acquire, from the received channel multicast media stream, a transport stream packet containing program specific information, where the program specific information is used to decode the media data;
  • a second handover processing module configured to: in the channel switching process, obtain a transport stream packet containing the program-specific information from the information stored in the acquired transport stream packet module, and reassemble into a real transport protocol packet;
  • the second sending module is configured to send the actual transmission protocol message carrying the program-specific information to the terminal device, and then send the actual transmission protocol message carrying the media data to the terminal device.
  • Another channel switching system provided by the embodiment of the present invention includes:
  • a server configured to acquire, from the received channel multicast media stream, a transport stream packet containing program specific information, where the program specific information is used to decode the media data, in a channel switching process, Obtaining, from the stored information, a transport stream packet containing program specific information, and reassembling into a real transport protocol packet;
  • a terminal device configured to obtain program specific information from the received actual transmission protocol message, and decode the media data carried in the received real transmission protocol message by using the program specific information.
  • the program specific information is reorganized into a real transmission protocol message, and the flow characteristics of the actual transmission protocol message and the flow carrying the media data transmission protocol message are performed.
  • the feature is the same. In this way, after transmitting the actual transmission protocol message carrying the program-specific information to the terminal device, the actual transmission protocol message carrying the media data is sent to the terminal device, so that the program-specific information can precede the media data.
  • the phenomenon that the terminal device cannot correctly decode the received media data can be avoided, and the phenomenon that the channel switching is delayed due to waiting for the program-specific information to decode the media data can be avoided; Avoid channel switching, screen display or stagnant or black screen, and reduce program-specific information to the channel Switch the effect of delay.
  • FIG. 1 is a flowchart of a channel switching method according to an embodiment of the present invention.
  • FIG. 2 is a flow chart of a channel switching method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a channel switching method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a channel switching apparatus according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic diagram of a channel switching system according to Embodiment 5 of the present invention.
  • FIG. 6 is a flowchart of a channel switching method according to Embodiment 6 of the present invention.
  • Figure 7 is a schematic diagram of a channel switching apparatus according to a seventh embodiment of the present invention.
  • Embodiment 8 is a schematic diagram of a channel switching system according to Embodiment 8 of the present invention.
  • Embodiment 1 Channel switching method. The flow of the method is shown in Figure 1.
  • the program-specific information used for decoding the media data is reorganized into a real transmission protocol message.
  • the flow characteristics of the actual transmission protocol packet are the same as those of the actual transmission protocol packet carrying the media data. That is to say, the program-specific information and the media data decoded by using the program-specific information are transmitted through the transport stream having the same stream feature, and the transport stream of the program-specific information and the transport stream of the media data are all based on the real-time transmission.
  • the media data here may be media data of a target program for channel switching.
  • the target program of the channel switching may be first determined according to the channel switching request, and then, it is determined whether there is a target program for channel switching, and if there is a target program, Obtaining program-specific information of the target program from the cache, and recombining the obtained program-specific information into a real-transmission protocol message by using the stream feature corresponding to the media data, so that the reassembled real-transmission protocol packet and the carried media are The actual transmission protocol packet of the data has the same flow characteristics.
  • the serial number and the carried medium of the actual transmission protocol packet carrying the program-specific information (that is, the above-mentioned reassembled real transmission protocol packet)
  • the sequence number of the actual transmission protocol packet of the data is continuous, and if the sequence number of the real transmission protocol packet is sorted, the sequence number of the actual transmission protocol packet carrying the program specific information should be prior to Real-time transmission protocol with media data
  • the serial number of the message For example, if the number of the actual transmission protocol packets carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 1, the program-specific information is carried.
  • the serial number of the transport protocol packet is Nl.
  • the above N can be represented by 16b it. When N uses 16 bits to represent ⁇ , the value of N can be 1 to 65535.
  • the actual transmission protocol message carrying the program-specific information may be one or more, and when the actual transmission protocol message carrying the program-specific information is multiple, carrying the program-specific
  • the sequence number of the actual transmission protocol message of the information should be continuous not only with the sequence number of the actual transmission protocol message carrying the media data, but also the sequence number of each actual transmission protocol message carrying the program-specific information is different. And should also be continuous. For example, if the number of the actual transmission protocol packets carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 2, the two are carried with the program-specific
  • the serial number of the actual transmission protocol message of the information is N-1 and N-2, respectively.
  • the above N can be represented by 16 bits, and when N is represented by 16 bits, the value of N can be 1 to 65535.
  • the flow characteristics involved in this embodiment may include: a source IP address, a destination IP address, an IP protocol type, a source port, a destination port, a payload type of a real transmission protocol, and a synchronization source. , SSRC) and so on.
  • This embodiment does not limit the content specifically included in the stream feature.
  • the program-specific information may be acquired from the pre-stored information, and the process of acquiring the program-specific information from the stored information may be: extracting the program-specific information from the stored transport stream packet, or may be from the stored The transport stream packet containing the program-specific information is obtained in the information, so that, in the reorganization process, the extracted program-specific information or the acquired transport stream packet containing the program-specific information may be reassembled into a real transport protocol packet.
  • the actual transmission protocol message carrying the program-specific information may be sent to the terminal device.
  • the terminal device may be notified that the starting sequence number of the transmission protocol message is carried with the program-specific information.
  • the sequence number of the transmission protocol packet for example, notifies the terminal device that the starting sequence number of the transmission protocol packet is N-1 or N-2.
  • the content notified here can carry the response message for the channel switching request Medium.
  • the executive body of the first embodiment may be logically referred to as a channel switching server, and the channel switching server may be an independent network device, or may be combined with other logical functions in the network, for example, a channel.
  • the switching server is set in the access switch, or is set in the router, or is set in the aggregation switch and the router.
  • the terminal device in the first embodiment may be Set Top
  • STB STB
  • STB home gateway with integrated STB function
  • the program specific information is reassembled into a real transmission protocol message, and the flow characteristics of the actual transmission protocol message and the actual transmission protocol message carrying the media data are obtained. The flow characteristics are the same. In this way, after transmitting the actual transmission protocol message carrying the program-specific information to the terminal device, and then transmitting the actual transmission protocol message carrying the media data to the terminal device, the program-specific information can be made first.
  • the terminal device can avoid the phenomenon that the received media data cannot be decoded normally, and the phenomenon that the channel switching is delayed due to waiting for the program-specific information to decode the media data can be avoided;
  • the phenomenon that the screen is displayed or stagnant or black screen can be avoided, and the influence of the program-specific information on the channel switching delay can be avoided.
  • the process of requesting retransmission of the actual transmission protocol message can be avoided by making the sequence number of the actual transmission protocol message carrying the program-specific information continuous with the sequence number of the actual transmission protocol message carrying the media data.
  • the first embodiment can avoid the impact of the channel-switching delay. Therefore, the channel switching method in the first embodiment can be called a fast channel switching method.
  • the channel switching server can be referred to as a fast channel switching server.
  • Embodiment 2 Channel switching method. The flow of the method is shown in Figure 2.
  • the terminal device receives the actual transmission protocol message.
  • the actual transmission protocol message may be sent by the fast channel switching server.
  • the actual transmission protocol packet received by the terminal device may include: a real transmission carrying the program-specific information
  • the flow characteristics of the actual transmission protocol packet carrying the program-specific information are the same as the flow characteristics of the packet carrying the media data transmission protocol.
  • the flow features involved in this embodiment may use the flow features described in the prior art.
  • the flow characteristics include: source IP address, destination IP address, IP protocol type, source port, destination port, and real ⁇ The type of load of the transport protocol and SSRC. This embodiment does not limit the content specifically included in the stream feature.
  • the terminal device After transmitting the fast channel switching request message, the terminal device receives the above-mentioned actual transmission protocol message.
  • the terminal device typically receives the above-described actual transmission protocol message after receiving the fast channel switching response message for the fast channel switching request message.
  • the fast channel switch response message may be an RTCP message, that is, an RTCP-based fast channel switch response message. This embodiment does not exclude the case where the terminal device first receives the above-mentioned actual transmission protocol message and then receives the above RTCP-based fast channel switching response message.
  • the sequence number of the actual transmission protocol message received by the terminal device carrying the program-specific information is continuous with the sequence number of the actual transmission protocol message carrying the media data, and if The sequence number of the actual transmission protocol packet is sorted, and the sequence number of the actual transmission protocol packet carrying the program-specific information precedes the sequence number of the actual transmission protocol packet carrying the media data.
  • the actual transmission protocol packet that is received by the terminal device and carries the program-specific information may be one or more.
  • the terminal device receives the actual transmission protocol packet carrying the program-specific information, the packet is carried in multiple ports.
  • the sequence number of the actual transmission protocol message of the program-specific information is not only continuous with the serial number of the actual transmission protocol message carrying the media data, but also the serial number of each actual transmission protocol message carrying the program-specific information is not Same and should be continuous.
  • the fast channel switching response message may be configured to notify the terminal device that the starting sequence number of the transmission protocol message is the sequence number of the real transmission protocol message carrying the program specific information. After receiving the fast channel switching response message, the terminal device can obtain the starting sequence number of the received real transmission protocol packet.
  • the terminal device acquires program-specific information from the received actual transmission protocol message.
  • the terminal device may obtain program specific information from one or more received transmission protocol messages, that is, one or more real transmission protocol messages received by the terminal device carry program specific information.
  • the terminal device uses the program specific information acquired above to receive the received real transmission protocol message.
  • the carried media data is decoded.
  • the terminal device obtains the media data from the actual transmission protocol message carrying the media data, and decodes the media data by using the program specific information acquired from the real transmission protocol message.
  • Embodiment 3 Channel switching method. The flow of the method is shown in Figure 3.
  • the head end ie, the source device of the program
  • the channel multicast media data stream includes media data of the switched target program.
  • the fast channel switching server receives and caches the channel multicast media data stream, and the fast channel switching server identifies the key information in the channel multicast media data stream, that is, extracts the PSI information from the multicast media data and identifies Keyframe.
  • extracting the PSI from the multicast media data may be: extracting only the PSI from the multicast media data; or: extracting the TS packet including the PSI from the multicast media data.
  • the above key frame may be an IDR frame or an I frame or the like.
  • the UE ie, the terminal device
  • the fast channel switching request message may be Real-time Transport Control
  • RTCP Real Transmission Control Protocol
  • FCC Fast Channel change
  • the fast channel switching server After receiving the fast channel switching request, the fast channel switching server returns a fast channel switching response message to the user end to respond to the fast channel switching request message sent by the user end.
  • the fast channel switch response message may be an RTCP message, and the RTCP message may be referred to as an RTCP FCC signaling stream.
  • the fast channel switching response message may carry information indicating that the starting sequence number of the UE's actual transmission protocol message is the sequence number of the actual transmission protocol message carrying the program-specific information, such that the UE After receiving the fast channel switching response message, the start sequence number of the received real transmission protocol message, that is, N-2, can be obtained.
  • the fast channel switching server obtains the PSI corresponding to the target program from the cache. For example, after determining that the target program exists, the fast channel switching server acquires the PSI corresponding to the target program from the cache. The fast channel switching server reassembles the PSI into an RTP message. The reassembled RTP packet can be called a PSI over RTP packet. If the sequence number of the initial RTP packet of the key frame is N, and two RTP packets carry P SI, the sequence number of the first PSI over RTP packet is N-2, and the second PSI over
  • the sequence number of the RTP packet is N-l.
  • PSI over RTP packet flow characteristics such as source IP address, destination IP address, IP protocol type, source port, destination port, RTP Payload
  • Type (load type, PT) and SSRC are the same as the stream characteristics of RTP packets of key frames.
  • the fast channel switching server pushes the PSI over RTP packet with the sequence number N-2 to the client.
  • the TS packet including the PSI may be reassembled into an RTP packet in S340.
  • the flow characteristics of the RTP packet carrying the PSI may be the same as the stream feature of the RTP packet of the key frame, and the sequence number is continuous.
  • the S350 and the fast channel switching server push the PSI over RTP packet with the sequence number N-1 to the client.
  • the client obtains the PSI from the received PSI over RTP packet.
  • S360 The fast channel switching server pushes the RTP message from the initial RTP message of the key frame to the client.
  • the starting point of the key frame The serial number of the RTP message is ⁇
  • the UE After receiving the RTP packet of the key frame, the UE can use the obtained PSI to decode the media data carried in the RTP packet of the key frame.
  • the fast channel switching server sends a synchronization message to the UE after determining that the RTP unicast stream (ie, the media data pushed in the S360) that is pushed to the UE is synchronized with the multicast stream.
  • the multicast packet synchronization message can be an RTCP packet.
  • the synchronization message is used to notify the UE to join the multicast group where the target program is located.
  • the UE After receiving the synchronization message, the UE sends a join multicast group request message to the network device where the fast channel switching server is located, to request to join the multicast group where the target program is located.
  • the network device where the fast channel switching server is located such as a switch or router.
  • Embodiment 4 Channel switching device.
  • the device may be logically referred to as a channel switching server.
  • the device may be disposed in the access switch, or may be disposed in the router, or may be disposed in the aggregation switch and the router.
  • a schematic of the device is shown in Figure 4.
  • the apparatus of FIG. 4 includes: a first handover processing module 400 and a first transmission module 410.
  • the first handover processing module 400 is configured to reassemble the program-specific information into a real-transmission protocol packet during the channel switching process, where the flow characteristics of the real-transmission protocol packet and the actual transmission of the media data are carried.
  • the flow characteristics of the protocol message are the same; the program specific information here is used to decode the media data stream.
  • the media data is the media data of the target program for channel switching.
  • the first handover processing device 400 can obtain program specific information from information stored by the device.
  • the process of the first switching processing module 400 for acquiring the program-specific information from the information stored by the device may be: extracting the program-specific information from the stored transport stream packet, or: obtaining the transport stream containing the program-specific information from the stored information.
  • the first switching processing module 400 may reassemble the extracted program specific information or the acquired transport stream packet containing the program specific information into a real transport protocol message.
  • the sequence number of the real transmission protocol message carrying the program-specific information recombined by the first handover processing module 400 is continuous with the sequence number of the actual transmission protocol message carrying the media data.
  • the sequence number of the actual transmission protocol message carrying the program-specific information should be prior to the sequence number of the actual transmission protocol message carrying the media data. For example, if the number of the actual transmission protocol packets carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 1, the program-specific information is carried.
  • the serial number of the transport protocol packet is Nl.
  • the first handover processing module 400 may have one or more real transmission protocol packets carrying the program-specific information, and the actual transmission protocol packet carrying the program-specific information is After the multiple handover processing module 400 reassembles the actual transmission protocol packet, the sequence number of the actual transmission protocol packet carrying the program-specific information and the actual transmission protocol packet carrying the media data should be used.
  • the serial numbers are consecutive, and the sequence numbers of the actual transmission protocol messages carrying the program-specific information should also be different and should be continuous.
  • the first handover processing module 400 should make the sequence numbers of the two real transmission protocol packets carrying the program-specific information N-1 and N-2, respectively.
  • the flow features involved in this embodiment may use the flow features described in the prior art.
  • the flow characteristics include: source IP address, destination IP address, IP protocol type, source port, destination. Port, load type of real transmission protocol, SSRC, etc. This embodiment does not limit the content specifically included in the stream feature.
  • the first sending module 410 is configured to send, to the terminal device, the real transmission protocol message carrying the program specific information after the first switching processing module 400 is reassembled, and then send the actual data carrying the media data to the terminal device.
  • Transmission protocol message That is, the first transmitting module 410 will program the dedicated information and utilize the program.
  • the media data decoded by the dedicated information is transmitted through a transport stream having the same stream characteristics.
  • the first sending module 410 may send a real transmission protocol message carrying the program specific information to the terminal device after sending the channel switching response message to the terminal device.
  • the first sending module 410 may send a channel switching response message to the terminal device before transmitting the actual transmission protocol packet carrying the program-specific information to the terminal device, where the channel switching response message carries the notification terminal device to transmit
  • the starting sequence number of the protocol message is the information of the sequence number of the actual transmission protocol message carrying the program-specific information.
  • the terminal device here may be an STB or a device such as a home gateway integrated with an STB function.
  • the first handover processing module 400 includes: a first acquisition submodule 401, a first serial number assignment submodule 402, and a first reassembly submodule 403.
  • the first obtaining submodule 401 is configured to obtain program specific information for decoding the media data stream after the device that the device is located receives the channel switching request sent by the terminal device. For example, after receiving the channel switching request sent by the terminal device, the first acquiring sub-module 401 may first determine the target program of the channel switching according to the channel switching request, and then determine whether there is a target program for channel switching. If the target program exists, the program-specific information of the target program is obtained from the cache.
  • the first sequence number assignment sub-module 402 is configured to allocate a sequence number to the real-transmission protocol packet carrying the program-specific information, where the sequence number is consecutive to the sequence number of the actual transmission protocol packet carrying the media data, and For the ordering of the serial numbers, the sequence number of the actual transmission protocol message carrying the program-specific information precedes the sequence number of the actual transmission protocol message carrying the media data. If the number of the actual transmission protocol packets carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 1, the first sequence number assignment sub-module 402 is carried. The serial number assigned to the actual transmission protocol message of the program-specific information is N1.
  • the first sequence number allocation sub-module 402 is two.
  • the sequence numbers assigned to the actual transmission protocol packets carrying the program-specific information are N-1 and N-2, respectively.
  • the first recombination submodule 403 is configured to reassemble the program information acquired by the first acquisition submodule 401 into a real transmission protocol packet, where the sequence number of the reorganized real transmission protocol packet is the first sequence number assignment.
  • the sequence number assigned by the sub-module 402, and the first recombination sub-module 403 can reorganize the program-specific information by using the stream feature corresponding to the media data, and the real-time transmission of the first recombination sub-module 403
  • the transmission protocol message has the same flow characteristics as the actual transmission protocol message carrying the media data.
  • the first handover processing module 400 reassembles the program-specific information into a real-transmission protocol packet, and causes the traffic characteristics of the real-transmission protocol packet to carry the media data.
  • the traffic characteristics of the actual transmission protocol packets are the same, and the first sending module 410 sends the actual transmission data carrying the media data to the terminal device after transmitting the actual transmission protocol packet carrying the program-specific information to the terminal device.
  • the protocol message can make the program-specific information reach the terminal device before the media data, thereby avoiding the phenomenon that the terminal device cannot decode the received media data normally, and also avoids waiting for the program-specific information to decode the media data.
  • the phenomenon of the fourth embodiment avoids the phenomenon that the screen is displayed or stagnated or black screened, and the influence of the program-specific information on the channel switching delay is avoided.
  • the first handover processing module 400 avoids requesting retransmission of the actual transmission protocol report by making the sequence number of the actual transmission protocol message carrying the program-specific information continuous with the sequence number of the actual transmission protocol message carrying the media data.
  • the process of the text Since the fourth embodiment can avoid the influence of the decoding dedicated information on the channel switching delay, the channel switching apparatus in the fourth embodiment can implement fast switching of the channel, so that the channel switching apparatus in the fourth embodiment can implement fast channel switching, and the embodiment
  • the channel switching device of four may be referred to as a fast channel switching device.
  • Embodiment 5 Channel switching system. A schematic of the system is shown in Figure 5.
  • the system of Figure 5 includes: a server 500 and a terminal device 510.
  • the server 500 may be referred to as a channel switching server, and the server 500 may be disposed in the access switch, may be disposed in the router, or may be disposed in the aggregation switch and the router.
  • the terminal device 510 can be an STB or other device such as a home gateway integrated with the STB function. Although only one terminal device 510 is shown in the system of Fig. 5, it is obvious that a plurality of terminal devices 510 may be included in the system.
  • the server 500 is configured to recombine the program-specific information used for decoding the media data stream into a real-transmission protocol packet, where the flow characteristics of the actual transmission protocol packet and the carried media are carried out during the channel switching process.
  • the flow characteristics of the data transmission protocol packets are the same; the server 500 transmits the actual transmission protocol message carrying the program-specific information to the terminal device 510, and then the server 500 transmits the actual transmission protocol message carrying the media data.
  • the media data here may be media data of a target program for channel switching.
  • the server 500 can acquire program-specific information of the target program of the channel switching from the information stored therein.
  • the server 500 can acquire program-specific information from the channel multicast media stream it receives and store it. Another In addition, after receiving the channel multicast media stream sent by the source device of the program, the server 500 may obtain the program-specific information from the channel multicast media stream and store it, or may obtain the program-specific data from the channel multicast media stream.
  • the transport stream of information is stored, and the transport stream packet is stored.
  • the server 500 stores the transport stream packet containing the program-specific information
  • the server 500 can directly obtain the transport stream packet including the program-specific information after reassembling the real-transport protocol packet, and reassemble the transport stream packet into a real packet. ⁇ Transmission protocol packets.
  • the sequence number of the actual transmission protocol message carrying the program-specific information reassembled by the server 500 is continuous with the sequence number of the actual transmission protocol message carrying the media data, and, if the transmission protocol is actual If the sequence number of the message is sorted, the sequence number of the actual transmission protocol message carrying the program-specific information should be prior to the sequence number of the actual transmission protocol message carrying the media data. For example, if the starting sequence number of the actual transmission protocol packet carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 1, the server 500 should make the reorganized The serial number of the actual transmission protocol message carrying the program-specific information is N-1.
  • the actual transmission protocol message carrying the program-specific information after the reorganization of the server 500 may be one or more.
  • the server 500 is reorganized.
  • the sequence number of the actual transmission protocol packet carrying the program-specific information should be continuous with the sequence number of the actual transmission protocol packet carrying the media data, and should also be carried
  • the sequence numbers of the actual transmission protocol messages of the program-specific information are not the same and should be continuous.
  • the server 500 should The sequence numbers of the two actual transmission protocol packets carrying the media data are N-1 and N-2, respectively.
  • the server 500 also needs to notify the terminal device that the starting sequence number of the transmission protocol message is the sequence number of the actual transmission protocol message carrying the program-specific information, and the notification information may be carried in the channel sent to the terminal device. Switch the response message.
  • the flow features involved in this embodiment may use the flow features described in the prior art.
  • the flow characteristics include: source IP address, destination IP address, IP protocol type, source port, Destination port, load type of real transmission protocol, SSRC, etc. This embodiment does not limit the content specifically included in the flow characteristics.
  • the structure of the server 500 can be as described in the above fourth embodiment, and the description thereof will not be repeated here.
  • the terminal device 510 is configured to receive a real transmission protocol message sent by the server 500, obtain program specific information from the received real transmission protocol message, and use the program specific information to receive the received real message.
  • the media data carried in the protocol packet is decoded.
  • the media data here is the media data of the target program for channel switching.
  • the terminal device 510 may obtain program specific information from one or more received transmission protocol messages, that is, one or more actual transmission protocol messages received by the terminal device 510 are carried in the terminal device 510.
  • the program is dedicated to suffocation.
  • the terminal device 510 can learn, according to the notification information of the server 500, that the starting sequence number of the real transmission protocol packet is the sequence number of the real transmission protocol packet carrying the program specific information, for example, the terminal device 510 can receive according to the The information carried in the channel switching response message is obtained.
  • the starting sequence number of the actual transmission protocol packet is the sequence number of the actual transmission protocol packet carrying the program-specific information.
  • Embodiment 6 Channel switching method. The flow of the method is shown in Figure 6.
  • S600 Obtain a transport stream packet containing program specific information from the received channel multicast media stream, and store the transport stream packet.
  • the program specific information here is used to decode the media data.
  • the transport stream packet containing the program-specific information is obtained from the stored information, and the transport stream packet is reassembled into a real transport protocol packet.
  • the program-specific information here is program-specific information of the target program of the channel switching.
  • the flow characteristics of the actual transmission protocol message carrying the program-specific information are the same as the flow characteristics of the actual transmission protocol message carrying the media data.
  • the sequence number of the actual transmission protocol message carrying the program-specific information is consecutive to the sequence number of the actual transmission protocol message carrying the media data, and the sequence number is carried, and the actual transmission of the program-specific information is carried.
  • the sequence number of the protocol packet precedes the sequence number of the actual transmission protocol packet carrying the media data. This step allows the program specific information and the media data to be decoded using the program specific information to be transmitted through the transport stream having the same stream characteristics.
  • the channel switching target program may be first determined according to the channel switching request, and then, it is determined whether there is a target program for channel switching, and if there is a target program, Obtaining a transport stream packet containing the program-specific information of the target program from the cache, and reassembling the obtained transport stream packet into a real transport protocol packet by using the stream feature corresponding to the media data of the target program, so that the reconstructed entity is reconstructed Transmission protocol message and actual transmission protocol carrying media data Messages have the same stream characteristics.
  • the actual transmission protocol packet carrying the transport stream packet containing the program-specific information may be one or more.
  • the program-specific information is carried.
  • the sequence number of the actual transmission protocol packet of the transport stream packet is Nl. If the number of the actual transmission protocol packets carrying the media data carrying the media data is N, and the number of the actual transmission protocol packets carrying the transport stream packet containing the program-specific information is 2, the two carriers include The sequence numbers of the actual transmission protocol packets of the transport stream packet of the program-specific information are N-1 and N-2, respectively.
  • the flow features involved in this embodiment may use the flow features described in the prior art.
  • the flow characteristics include: a source IP address, a destination IP address, an IP protocol type, a source port, and Destination port, load type of real transmission protocol, SSRC, etc. This embodiment does not limit the content specifically included in the flow characteristics.
  • [108] S620. Send, to the terminal device, a real transmission protocol message carrying program specific information. Specifically, after the channel switching response message is sent to the terminal device, the actual transmission protocol packet carrying the program-specific information may be sent to the terminal device.
  • the channel switching response message sent to the terminal device may carry information that informs the terminal device that the starting sequence number of the transmission protocol message is the sequence number of the actual transmission protocol message carrying the program-specific information, and thus, the terminal device After receiving the channel switching response message, the start sequence number of the received real transmission protocol message, such as N-2, can be obtained.
  • S630 Send a real transmission protocol packet carrying the media data to the terminal device.
  • the media data here is the media data of the target program for channel switching.
  • the stream characteristics of the real transmission protocol packet carrying the media data are the same as the stream characteristics of the real transmission protocol packet carrying the program specific information.
  • the executive body of Embodiment 6 may be logically referred to as a channel switching server.
  • the channel switching server may be an independent network device, or may be combined with other logical functions in the network, for example, a channel.
  • the switching server is set in the access switch, or is set in the router, or is set in the aggregation switch and the router.
  • the terminal device in Embodiment 6 may be Set Top
  • STB STB
  • STB home gateway with integrated STB function
  • the transport packet including the program-specific information is obtained from the received channel multicast media stream, and the transport packet is reassembled into a real transport protocol packet, which is convenient.
  • the program-specific information is reassembled into a real-transmission protocol packet; the stream feature of the actual transmission protocol packet is the same as the traffic characteristic of the real-transmission protocol packet carrying the media data, and thus, the packet is sent to the terminal device.
  • the device After the actual transmission protocol message with the program-specific information, the device transmits the actual transmission protocol message carrying the media data to the terminal device, so that the program-specific information can reach the terminal device before the media data, thereby avoiding the terminal device pair.
  • the received media data cannot be decoded normally.
  • the phenomenon that the program-specific information is decoded to the media data can be avoided.
  • the sixth embodiment can avoid the phenomenon of screen stagnation or stagnation or black screen, and can avoid program-specific use.
  • the process of requesting retransmission of the actual transmission protocol message can be avoided by making the sequence number of the actual transmission protocol message carrying the program-specific information continuous with the sequence number of the actual transmission protocol message carrying the media data.
  • the effect of the decoding of the dedicated information on the channel switching delay can be avoided. Therefore, the sixth embodiment can implement the fast switching of the channel, so that the channel switching method in the sixth embodiment can be referred to as the fast channel switching method, in the sixth embodiment.
  • the channel switching server can be referred to as a fast channel switching server.
  • Embodiment 7 Channel switching device.
  • the device may be logically referred to as a channel switching server.
  • the device may be disposed in the access switch, or may be disposed in the router, or may be disposed in the aggregation switch and the router.
  • a schematic of the device is shown in Figure 7.
  • the apparatus in FIG. 7 includes: a get transport stream packet module 700, a second switch processing module 710, and a second transmit module 720.
  • the transport stream packet module 700 is configured to obtain a transport stream packet containing program specific information from the received channel multicast media stream, and store the transport stream packet.
  • the program specific information here is used to decode the media data.
  • the channel multicast media stream here may be sent by the source device of the program.
  • the second handover processing module 710 is configured to reassemble the transport stream packet that contains the program-specific information acquired from the stored information into a real transport protocol packet during the channel switching process.
  • the program-specific information here is program-specific information of the target program for channel switching.
  • the second handover processing module 710 may use the flow characteristics of the actual transmission protocol packet carrying the media data after the actual transmission protocol message is reassembled. That is to say, the flow characteristics of the actual transmission protocol message carrying the program-specific information are the same as the flow characteristics of the actual transmission protocol message carrying the media data. In addition, the second handover processing module 710 reassembles the real transmission protocol packet carrying the program specific information.
  • the sequence number is consecutive to the sequence number of the actual transmission protocol message carrying the media data, and for the sequence number sequence, the sequence number of the actual transmission protocol message carrying the program-specific information precedes the carried media data.
  • the serial number of the actual transmission protocol message is consecutive to the sequence number of the actual transmission protocol message carrying the media data, and for the sequence number sequence, the sequence number of the actual transmission protocol message carrying the program-specific information precedes the carried media data. The serial number of the actual transmission protocol message.
  • the second handover processing module 710 can cause the program specific information and the media data that needs to be decoded using the program specific information to be transmitted through the transport stream having the same stream characteristics.
  • the second switching processing module 710 may first determine the target program of the channel switching according to the channel switching request, and then determine whether there is a target program for channel switching, and if there is a target program, Obtaining a transport stream packet containing program specific information of the target program, and reassembling the obtained transport stream packet into a real transport protocol packet by using a stream feature corresponding to the media data of the target program, so that the reassembled real The transport protocol packet has the same flow characteristics as the real transport protocol packet carrying the media data.
  • the second handover processing module 710 may be one or more of the actual transmission protocol packets carrying the transport stream packet containing the program-specific information. If the number of the actual transmission protocol packets carrying the media data carrying the media data is N, and the number of the actual transmission protocol packets carrying the transport stream packet containing the program specific information is 1, the second handover processing module 710 The sequence number of the actual transmission protocol packet carrying the transport stream packet containing the program-specific information after reassembly may be N1.
  • the second handover processing module 710 may be N-1 and N-2, respectively.
  • the flow characteristics involved in this embodiment may use the flow characteristics described in the prior art.
  • the flow characteristics include: a source IP address, a destination IP address, an IP protocol type, a source port, and Destination port, load type of real transmission protocol, SSRC, etc. This embodiment does not limit the content specifically included in the flow characteristics.
  • the second switching processing module 710 may include: a second obtaining submodule 711, a second serial number assigning submodule 712, and a second recombining submodule 713.
  • the second obtaining sub-module 711 is configured to obtain, after the device that the device is located, the channel switching request sent by the terminal device, the transport stream packet that includes the program-specific information is obtained from the stored information. Specifically, after receiving the channel switching request sent by the terminal device, the second acquiring submodule 711 may First, the target program of the channel switching is determined according to the channel switching request. Then, it is determined whether there is a target program for channel switching. If the target program exists, the transport stream packet containing the program-specific information of the target program is acquired from the stored information.
  • the second serial number assigning sub-module 712 is configured to allocate a serial number to the real transmission protocol packet carrying the program-specific information, where the serial number is consecutive with the serial number of the actual transmission protocol packet carrying the media data, and For the ordering of the sequence numbers, the sequence number of the actual transmission protocol message carrying the program-specific information precedes the sequence number of the actual transmission protocol message carrying the media data. If the number of the actual transmission protocol packets carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 1, the second sequence number assignment sub-module 712 is carried. The serial number assigned to the actual transmission protocol message of the program-specific information is N1.
  • the second sequence number assignment sub-module 712 is two.
  • the sequence numbers assigned to the actual transmission protocol packets carrying the program-specific information are N-1 and N-2, respectively.
  • the second recombination sub-module 713 is configured to reassemble the transport stream packet obtained by the second obtaining sub-module 711 into a real-transmission protocol packet, where the sequence number of the re-established real-transmission protocol packet is a serial number assignment sub-module
  • the sequence number assigned by the 712, the second recombination sub-module 713 may perform reassembly of the actual transmission protocol packet by using the stream feature corresponding to the media data, and the flow of the reassembled real transmission protocol packet.
  • the feature is the same as the stream feature of the actual transmission protocol message carrying the media data.
  • the media data here is the media data of the target program.
  • the second sending module 720 is configured to send, to the terminal device, a real transmission protocol message carrying the program specific information, and then send the actual transmission protocol message carrying the media data to the terminal device.
  • the second sending module 720 may send a real transmission protocol message carrying the program specific information to the terminal device after transmitting the channel switching response message to the terminal device.
  • the second sending module 720 may send a channel switching response message to the terminal device before transmitting the actual transmission protocol packet carrying the program-specific information to the terminal device, where the channel switching response message carries the notification terminal device to transmit
  • the starting sequence number of the protocol message is the information of the sequence number of the actual transmission protocol message carrying the program-specific information.
  • Embodiment 8 Channel switching system. A schematic of the system is shown in Figure 8.
  • the system of FIG. 8 includes: a server 800 and a terminal device 810.
  • Server 800 can be called channel switching service
  • the server 800 may be disposed in the access switch, or may be disposed in the router, or may be disposed in the aggregation switch and the router.
  • the terminal device 810 may be an STB or other device such as a home gateway integrated with the STB function. Although only one terminal device 810 is shown in the system of Fig. 8, it will be apparent that a plurality of terminal devices 810 may be included in the system.
  • the server 800 is configured to obtain, from the received channel multicast media stream, a transport stream packet including program specific information, and store the transport stream packet, where the program specific information is used to decode the media data in the channel. During the handover, the server 800 obtains the transport stream packet from the stored information, and reassembles the transport stream packet obtained from the stored information into a real transport protocol packet.
  • the channel multicast media stream here can be sent by the program source device.
  • the sequence number of the actual transmission protocol message carrying the program-specific information after the reorganization of the server 800 is continuous with the sequence number of the actual transmission protocol message carrying the media data, and if the transmission protocol is If the sequence number of the message is sorted, the sequence number of the actual transmission protocol message carrying the program-specific information may precede the sequence number of the actual transmission protocol message carrying the media data. For example, if the number of the actual transmission protocol packets carrying the media data is N, and the number of the actual transmission protocol packets carrying the program-specific information is 1, the server 800 can make the reorganized The serial number of the actual transmission protocol message carrying the program-specific information is N-1.
  • the server 800 may be one or more of the actual transmission protocol messages carrying the program-specific information, and the server 800 is reorganized when the actual transmission protocol message carrying the program-specific information is multiple.
  • the transmission protocol packet ⁇ causes the sequence number of the actual transmission protocol message carrying the program-specific information to be consecutive with the sequence number of the actual transmission protocol message carrying the media data, and can be carried with the program-specific information.
  • the sequence numbers of the packets of the actual transmission protocol are different and are also continuous.
  • the server 800 may The sequence numbers of the two actual transmission protocol packets carrying the media data are N-1 and N-2, respectively.
  • the server 800 also needs to notify the terminal device that the starting sequence number of the transmission protocol message is the sequence number of the actual transmission protocol message carrying the program-specific information, and the notification information can be carried in the channel sent to the terminal device.
  • the terminal device is notified that the start sequence number of the transmission protocol message is N-2.
  • the flow features involved in this embodiment may use the flow features described in the prior art.
  • the flow characteristics include: a source IP address, a destination IP address, an IP protocol type, a source port, and Destination port, load type of real transmission protocol, SSRC, etc. This embodiment does not limit the content specifically included in the stream feature.
  • the terminal device 810 is configured to receive the program specific information from the received real transmission protocol message from the received transmission protocol message sent by the receiving server 800, and use the program specific information to receive the received information.
  • the media data carried in the transport protocol packet is decoded.
  • the media data here is the media data of the target program of the channel switching.
  • the terminal device 810 may obtain program specific information from one or more received transmission protocol messages, that is, one or more actual transmission protocol messages received by the terminal device 810 are carried in the terminal device 810.
  • the program is dedicated to suffocation.
  • the terminal device 810 can learn, according to the notification information of the server 800, that the starting sequence number of the real transmission protocol packet is the sequence number of the real transmission protocol packet carrying the program specific information, for example, the terminal device 810 can receive according to the The information carried in the channel switching response message is obtained.
  • the starting sequence number of the actual transmission protocol packet is the sequence number of the actual transmission protocol packet carrying the program-specific information.

Abstract

公开了频道切换方法、装置和系统。其中的一种频道切换方法包括:在频道切换过程中,将用于对媒体数据进行解码的节目专用信息重组为实时传输协议报文,所述实时传输协议报文的流特征与携带有所述媒体数据的实时传输协议报文的流特征相同;向终端设备发送所述携带有节目专用信息的实时传输协议报文,之后,向终端设备发送携带有所述媒体数据的实时传输协议报文。上述技术方案能够保证携带有节目专用信息的实时传输协议报文先于携带有媒体数据的实时传输协议报文到达终端设备,从而避免了终端设备出现的画面花屏或者黑屏等现象,并且避免了节目专用信息对频道切换时延的影响。

Description

说明书 频道切换方法、 装置和系统
[1] 技术领域
[2] 本发明涉及通讯技术领域, 具体涉及频道切换技术。
[3] 发明背景
[4] 在频道切换过程中, 终端设备在接收到网络侧 (如服务器) 针对频道切换请求 发送的频道切换应答后, 需要利用网络侧推送来的 Program Specific
Information (节目专用信息, PSI) 对网络侧推送来的媒体数据进行解码, 以实 现频道切换。
[5] 一种频道切换方法为: PSI周期性的出现在媒体数据流中, 该周期一般为 500ms
, 频道切换服务器不对接收到的媒体数据流中的 PSI进行识别等处理操作, 在切 换过程中, 频道切换服务器向终端设备推送识别出的关键帧, 终端设备接收关 键帧, 并从接收到的媒体数据流中识别 PSI, 之后, 终端设备利用识别出的 PSI对 关键帧进行解码, 实现频道切换。 根据编码方式的不同上述关键帧可以为 Indepe ndent Decoding Refresh (独立解码更新, IDR) 帧或者 Intra (I帧) 等。
[6] 在上述频道切换方法中, PSI与关键帧中的第一个 Transport
Stream (传输流, TS) 包之间的距离对频道切换吋延会产生影响, 如果距离较 大, 则频道切换吋延也较大。
[7] 为了减少频道切换吋延, 频道切换服务器可以从接收到的媒体数据流中提取 PS
I, 并在向终端设备发送关键帧之前通过 Real-time Transport Control
Protocol (实吋传输控制协议, RTCP) 发送 PSI, 但是: 在实现本发明的过程中 , 发明人发现: RTCP和关键帧在网络中的传输吋延会有所不同, 因此, PSI和媒 体数据到达终端设备的吋间也会有所不同。 PSI可能会晚于媒体数据到达终端设 备, 在这种情况下, 终端设备可能会丢弃滞后到达的 PSI, 从而由于终端设备无 法对其接收到的媒体数据进行解码而导致画面花屏或者停滞或者黑屏等现象; 另外, 即便是终端设备不丢弃滞后到达的 PSI, 也会由于终端设备等待 PSI而影响 频道切换吋延。 [8] 发明内容
[9] 本发明实施方式提供了频道切换方法、 装置和系统, 可保证节目专用信息先于 媒体数据到达终端设备, 从而避免了由于无法对媒体数据进行解码而出现的画 面花屏或者停滞或者黑屏等现象, 而且, 还避免了节目专用信息对频道切换吋 延的影响。
[10] 本发明实施方式提供的频道切换方法, 包括:
[11] 在频道切换过程中, 将用于对媒体数据进行解码的节目专用信息重组为实吋传 输协议报文, 所述实吋传输协议报文的流特征与携带有所述媒体数据的实吋传 输协议报文的流特征相同;
[12] 向终端设备发送所述携带有节目专用信息的实吋传输协议报文;
[13] 向终端设备发送携带有所述媒体数据的实吋传输协议报文。
[14] 本发明实施方式提供的一种频道切换装置, 包括:
[15] 第一切换处理模块, 用于在频道切换过程中, 将用于对媒体数据流进行解码的 节目专用信息重组为实吋传输协议报文, 所述实吋传输协议报文的流特征与携 带有所述媒体数据的实吋传输协议报文的流特征相同;
[16] 第一发送模块, 用于向终端设备发送携带有节目专用信息的所述实吋传输协议 报文, 并向终端设备发送携带有媒体数据的实吋传输协议报文。
[17] 本发明实施方式提供的一种频道切换系统, 包括:
[18] 服务器, 用于在频道切换过程中, 将用于对媒体数据流进行解码的节目专用信 息重组为实吋传输协议报文, 所述实吋传输协议报文的流特征与携带有所述媒 体数据的实吋传输协议报文的流特征相同; 所述服务器发送所述携带有节目专 用信息的实吋传输协议报文, 并发送携带有所述媒体数据的实吋传输协议报文
[19] 终端设备, 用于从接收到的所述实吋传输协议报文中获取节目专用信息, 并利 用所述节目专用信息对接收到的实吋传输协议报文中携带的媒体数据进行解码
[20] 本发明实施方式提供的另一种频道切换方法, 包括:
[21] 从接收到的频道组播媒体流中获取包含有节目专用信息的传输流包并存储, 所 述节目专用信息用于对媒体数据进行解码;
[22] 在频道切换过程中, 从所述存储的信息中获取包含节目专用信息的传输流包, 并重组为实吋传输协议报文;
[23] 向终端设备发送所述携带有节目专用信息的实吋传输协议报文;
[24] 向所述终端设备发送携带有所述媒体数据的实吋传输协议报文。
[25] 本发明实施方式提供的一种频道切换装置, 包括:
[26] 获取传输流包模块, 用于从接收到的频道组播媒体流中获取包含有节目专用信 息的传输流包, 并存储, 所述节目专用信息用于对媒体数据进行解码;
[27] 第二切换处理模块, 用于在频道切换过程中, 从所述获取传输流包模块存储的 信息中获取包含有节目专用信息的传输流包, 并重组为实吋传输协议报文;
[28] 第二发送模块, 用于向终端设备发送所述携带有节目专用信息的实吋传输协议 报文, 之后, 向所述终端设备发送携带有媒体数据的实吋传输协议报文。
[29] 本发明实施方式提供的另一种频道切换系统, 包括:
[30] 服务器, 用于从接收到的频道组播媒体流中获取包含有节目专用信息的传输流 包, 并存储, 所述节目专用信息用于对媒体数据进行解码, 在频道切换过程中 , 从所述存储的信息中获取包含有节目专用信息的传输流包, 并重组为实吋传 输协议报文;
[31] 终端设备, 用于从接收到的所述实吋传输协议报文中获取节目专用信息, 并利 用所述节目专用信息对接收到的实吋传输协议报文中携带的媒体数据进行解码
[32] 通过上述技术方案的描述可知, 通过将节目专用信息重组为实吋传输协议报文 , 并且使该实吋传输协议报文的流特征与携带有媒体数据实吋传输协议报文的 流特征相同, 这样, 通过向终端设备发送携带有节目专用信息的实吋传输协议 报文之后, 再向终端设备发送携带有媒体数据的实吋传输协议报文, 使节目专 用信息可以先于媒体数据到达终端设备, 从而可以避免终端设备对接收到的媒 体数据不能正常解码的现象, 同吋, 也可以避免等待节目专用信息对媒体数据 进行解码导致频道切换存在吋延的现象; 进而上述技术方案可以避免频道切换 吋出现画面花屏或者停滞或者黑屏等现象, 并且可以降低节目专用信息对频道 切换吋延的影响。
[33] 附图简要说明
[34] 图 1是本发明实施例 -的频道切换方法流程图;
[35] 图 2是本发明实施例 .的频道切换方法流程图;
[36] 图 3是本发明实施例 :的频道切换方法流程图;
[37] 图 4是本发明实施例四的频道切换装置示意图;
[38] 图 5是本发明实施例五的频道切换系统示意图;
[39] 图 6是本发明实施例六的频道切换方法流程图;
[40] 图 7是本发明实施例七的频道切换装置示意图;
[41] 图 8是本发明实施例八的频道切换系统示意图。
[42] 实施本发明的方式
[43] 实施例一、 频道切换方法。 该方法的流程如附图 1所示。
[44] 图 1中, S100、 在频道切换过程中, 将用于对媒体数据进行解码的节目专用信 息重组为实吋传输协议报文。 这里的实吋传输协议报文的流特征与携带有媒体 数据的实吋传输协议报文的流特征相同。 也就是说, 节目专用信息和利用该节 目专用信息进行解码的媒体数据是通过具有相同流特征的传输流进行传输的, 且节目专用信息的传输流和媒体数据的传输流均是基于实吋传输协议的传输流 。 这里的媒体数据可以为频道切换的目标节目的媒体数据。
[45] 举例来说, 在接收到终端设备发送来的频道切换请求后, 可以先根据频道切换 请求确定频道切换的目标节目, 然后, 判断是否存在频道切换的目标节目, 如 果存在目标节目, 则从缓存中获取该目标节目的节目专用信息, 并利用媒体数 据对应的流特征将获取到的节目专用信息重组为实吋传输协议报文, 使重组后 的实吋传输协议报文与携带有媒体数据的实吋传输协议报文具有相同的流特征 举例来说, 上述携带有节目专用信息的实吋传输协议报文 (即上述重组后的实 吋传输协议报文) 的序列号与携带有媒体数据的实吋传输协议报文的序列号是 连续的, 而且, 如果对实吋传输协议报文的序列号进行排序, 那么携带有节目 专用信息的实吋传输协议报文的序列号应该先于携带有媒体数据的实吋传输协 议报文的序列号。 举例来说, 如果携带有媒体数据的实吋传输协议报文的起始 序列号为N、 且携带有节目专用信息的实吋传输协议报文的数量为 1, 则携带有 节目专用信息的实吋传输协议报文的序列号为 N-l。 举例来说, 上述 N可以用 16b it表示, 当 N使用 16bit表示吋, N的取值可以为 1到 65535。
[47] 又举例来说, 携带有节目专用信息的实吋传输协议报文可以为 1个或多个, 当 携带有节目专用信息的实吋传输协议报文为多个吋, 携带有节目专用信息的实 吋传输协议报文的序列号不但应该与携带有媒体数据的实吋传输协议报文的序 列号连续, 而且, 携带有节目专用信息的各实吋传输协议报文的序列号不相同 且也应该连续。 举例来说, 如果携带有媒体数据的实吋传输协议报文的起始序 列号为 N、 且携带有节目专用信息的实吋传输协议报文的数量为 2, 则这两个携 带有节目专用信息的实吋传输协议报文的序列号分别为 N-1和 N-2。 举例来说, 上述 N可以用 16bit表示, 当 N使用 16bit表示吋, N的取值可以为 1到 65535。
[48] 举例来说, 本实施例中涉及到的流特征可以包括: 源 IP地址、 目的 IP地址、 IP 协议类型、 源端口、 目的端口、 实吋传输协议的负荷类型以及 Synchronization source (同步源, SSRC) 等。 本实施例不限制流特征具体包括的内容。 另外, 本实施例可以从预先存储的信息中获取节目专用信息, 从存储的信息中获取的 节目专用信息的过程可以为: 从存储的传输流包中提取节目专用信息, 也可以 为从存储的信息中获取包含节目专用信息的传输流包, 这样, 在重组过程中, 可以将提取的节目专用信息或者获取的包含有节目专用信息的传输流包重组为 实吋传输协议报文。
[49] S110、 向终端设备发送携带有节目专用信息的实吋传输协议报文。 之后, 到 S1 20。
[50] 具体的, 可以在向终端设备发送频道切换响应消息后, 向终端设备发送携带有 节目专用信息的实吋传输协议报文。
[51] 举例来说, 在向终端设备发送所述携带有节目专用信息的实吋传输协议报文之 前还可以通知终端设备实吋传输协议报文的起始序列号为携带有节目专用信息 的实吋传输协议报文的序列号, 例如通知终端设备实吋传输协议书报文的起始 序列号为 N-1或 N-2。 这里通知的内容可以携带在针对频道切换请求的响应消息 中。
[52] S120、 向终端设备发送携带有媒体数据的实吋传输协议报文。 这里的媒体数据 为需要利用上述节目专用信息进行解码的媒体数据。 携带有媒体数据的实吋传 输协议报文的流特征与上述携带有节目专用信息的实吋传输协议报文的流特征 相同。
[53] 举例来说, 实施例一的执行主体在逻辑上可以称为频道切换服务器, 该频道切 换服务器可以为一个独立的网络设备, 也可以与网络中的其他逻辑功能合设, 例如, 频道切换服务器设置于接入交换机中, 或者设置于路由器中, 或者设置 于汇聚交换机和路由器中。 实施例一中的终端设备可以为 Set Top
Box (机顶盒, STB) , 也可以为其他设备, 如集成了 STB功能的家庭网关等。
[54] 从上述实施例一的描述可知, 通过将节目专用信息重组为实吋传输协议报文, 并且使该实吋传输协议报文的流特征与携带有媒体数据的实吋传输协议报文的 流特征相同, 这样, 通过向终端设备发送携带有节目专用信息的实吋传输协议 报文之后, 再向终端设备发送携带有媒体数据的实吋传输协议报文, 可以使节 目专用信息可以先于媒体数据到达终端设备, 从而可以避免终端设备对接收到 的媒体数据不能正常解码的现象, 同吋, 也可以避免等待节目专用信息对媒体 数据进行解码导致频道切换存在吋延的现象; 进而实施例一可以避免出现画面 花屏或者停滞或者黑屏等现象, 并且可以避免节目专用信息对频道切换吋延的 影响。 通过使携带有节目专用信息的实吋传输协议报文的序列号与携带有媒体 数据的实吋传输协议报文的序列号连续, 可以避免请求重传实吋传输协议报文 的过程。 由于实施例一可以避免解码专用信息对频道切换吋延的影响, 因此, 实施例一可以实现频道的快速切换, 从而实施例一中的频道切换方法可以称为 快速频道切换方法, 实施例一中的频道切换服务器可以称为快速频道切换服务 器。
[55] 实施例二、 频道切换方法。 该方法的流程如附图 2所示。
[56] 图 2中, S200、 在频道切换过程中, 终端设备接收实吋传输协议报文。 举例来 说, 该实吋传输协议报文可以是快速频道切换服务器发送来的。
[57] 终端设备接收到的实吋传输协议报文可以包括: 携带有节目专用信息的实吋传 输协议报文和携带有媒体数据的实吋传输协议报文。 携带有节目专用信息的实 吋传输协议报文的流特征与携带有媒体数据实吋传输协议报文的流特征相同。 举例来说, 本实施例中涉及到的流特征可以釆用现有技术中记载的流特征, 例 如, 流特征包括: 源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口、 实 吋传输协议的负荷类型以及 SSRC等。 本实施例不限制流特征具体包括的内容。
[58] 举例来说, 终端设备在发送快速频道切换请求消息后, 接收到上述实吋传输协 议报文。 终端设备通常在接收到针对快速频道切换请求消息的快速频道切换响 应消息后接收到上述实吋传输协议报文。 快速频道切换响应消息可以是 RTCP报 文, 即基于 RTCP的快速频道切换响应消息。 本实施例也不排除终端设备先接收 到上述实吋传输协议报文, 后接收到上述基于 RTCP的快速频道切换响应消息的 情况。
[59] 举例来说, 终端设备接收到的携带有节目专用信息的实吋传输协议报文的序列 号与携带有媒体数据的实吋传输协议报文的序列号是连续的, 而且, 如果对实 吋传输协议报文的序列号进行排序, 那么携带有节目专用信息的实吋传输协议 报文的序列号先于携带有媒体数据的实吋传输协议报文的序列号。 终端设备接 收到的携带有节目专用信息的实吋传输协议报文可以为 1个或多个, 当终端设备 接收到的携带有节目专用信息的实吋传输协议报文为多个吋, 携带有节目专用 信息的实吋传输协议报文的序列号不但与携带有媒体数据的实吋传输协议报文 的序列号连续, 而且, 携带有节目专用信息的各实吋传输协议报文的序列号不 相同且也应该连续。
[60] 举例来说, 上述快速频道切换响应消息中可以携带有通知终端设备实吋传输协 议报文的起始序列号为携带有节目专用信息的实吋传输协议报文的序列号的信 息, 终端设备在接收到快速频道切换响应消息后可以获知其接收的实吋传输协 议报文的起始序列号。
[61] S210、 终端设备从接收到的实吋传输协议报文中获取节目专用信息。 终端设备 可以从接收到的一个或多个实吋传输协议报文中获取节目专用信息, 也就是说 , 终端设备接收到的一个或多个实吋传输协议报文中携带有节目专用信息。
[62] S220、 终端设备利用上述获取的节目专用信息对接收到的实吋传输协议报文中 携带的媒体数据进行解码。
[63] 具体的说, 终端设备从携带有媒体数据的实吋传输协议报文中获取媒体数据, 并利用从实吋传输协议报文中获取的节目专用信息对该媒体数据进行解码。
[64] 实施例三、 频道切换方法。 该方法的流程如附图 3所示。
[65] S300、 头端 (即节目源端设备) 向快速频道切换服务器发送频道组播媒体数据 流。 该频道组播媒体数据流中包含有切换后的目标节目的媒体数据。
[66] S310、 快速频道切换服务器接收并缓存频道组播媒体数据流, 快速频道切换服 务器对频道组播媒体数据流中的关键信息进行识别, 即从组播媒体数据中提取 P SI信息并识别关键帧。 举例来说, 从组播媒体数据中提取 PSI可以为: 从组播媒 体数据中仅提取 PSI; 也可以为: 从组播媒体数据中提取包含有 PSI的 TS包。 上 述关键帧可以为 IDR帧或 I帧等。
[67] S320、 用户端 (即终端设备) 向快速频道切换服务器发送频道切换请求消息。
举例来说, 该快速频道切换请求消息可以是 Real-time Transport Control
Protocol (实吋传输控制协议, RTCP) 报文, 此吋, 该 RTCP报文可以称为 RTCP Fast Channel change (快速频道切换, FCC) 信令流。
[68] S330、 快速频道切换服务器在接收到快速频道切换请求后, 向用户端返回快速 频道切换响应消息, 以应答用户端发送的快速频道切换请求消息。 举例来说, 该快速频道切换响应消息可以是 RTCP报文, 此吋, 该 RTCP报文可以称为 RTCP FCC信令流。 举例来说, 快速频道切换响应消息中可以携带有通知用户端实吋传 输协议报文的起始序列号为携带有节目专用信息的实吋传输协议报文的序列号 的信息, 这样, 用户端在接收到快速频道切换响应消息后可以获知其接收的实 吋传输协议报文的起始序列号, 即 N-2。
[69] S340、 快速频道切换服务器从缓存中获取目标节目对应的 PSI, 例如, 快速频 道切换服务器在判断出存在目标节目后, 从缓存中获取目标节目对应的 PSI。 快 速频道切换服务器将 PSI重组为 RTP报文。 该重组的 RTP报文可以称为 PSI over RTP报文。 如果关键帧的起始 RTP报文的序列号为 N , 且有两个 RTP报文携带有 P SI , 则第一个 PSI over RTP报文的序列号为 N-2, 第二个 PSI over
RTP报文的序列号为 N- l。 另外, PSI over RTP报文的流特征 (如源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口 、 RTP Payload
Type (负荷类型, PT) 和 SSRC) 与关键帧的 RTP报文的流特征相同。 快速频道 切换服务器向用户端推送序列号为 N-2的 PSI over RTP报文。
[70] 需要说明的是, 如果在 S310中从组播媒体数据中提取的是包含有 PSI的 TS包, 则在 S340中可以将包含有 PSI的 TS包重组为 RTP报文。 此吋, 携带有 PSI的 RTP报 文的流特征也可以与关键帧的 RTP报文的流特征相同, 且序列号连续。
[71] S350、 快速频道切换服务器向用户端推送序列号为 N-1的 PSI over RTP报文。
[72] 用户端从接收到的 PSI over RTP报文中获取 PSI。
[73] S360、 快速频道切换服务器从关键帧的起始 RTP报文幵始向用户端推送 RTP报 文。 关键帧的起始 RTP报文的序列号为^
[74] 用户端在接收到关键帧的 RTP报文后即可使用上述获取的 PSI对关键帧的 RTP报 文中携带的媒体数据进行解码。
[75] S370、 快速频道切换服务器在确定出向用户端推送的 RTP单播流 (即 S360中推 送的媒体数据) 和组播流同步吋, 向用户端发送同步消息。 该组播报文同步消 息可以为 RTCP报文。 该同步消息用于通知用户端加入目标节目所在的组播组。
[76] S380、 用户端接收到同步消息后, 向快速频道切换服务器所在的网络设备发送 加入组播组请求消息, 以请求加入目标节目所在的组播组。 快速频道切换服务 器所在的网络设备如交换机或路由器等。
[77] S390、 快速频道切换服务器所在的网络设备在接收到加入组播组请求消息后, 向用户端推送头端发送来的目标节目的组播媒体流。
[78] 实施例四、 频道切换装置。 该装置在逻辑上可以称为频道切换服务器, 该装置 可以设置于接入交换机中, 也可以设置于路由器中, 还可以设置于汇聚交换机 和路由器中。 该装置的示意图如附图 4所示。
[79] 图 4中的装置包括: 第一切换处理模块 400和第一发送模块 410。
[80] 第一切换处理模块 400, 用于在频道切换过程中, 将节目专用信息重组为实吋 传输协议报文, 该实吋传输协议报文的流特征与携带有媒体数据的实吋传输协 议报文的流特征相同; 这里的节目专用信息用于对媒体数据流进行解码。 这里 的媒体数据为频道切换的目标节目的媒体数据。 举例来说, 第一切换处理装置 4 00可以从装置存储的信息中获取节目专用信息。 第一切换处理模块 400从装置存 储的信息中获取节目专用信息的过程可以为: 从存储的传输流包中提取节目专 用信息, 也可以为: 从存储的信息中获取包含节目专用信息的传输流包, 第一 切换处理模块 400可以将提取的节目专用信息或者获取的包含有节目专用信息的 传输流包重组为实吋传输协议报文。
[81] 举例来说, 第一切换处理模块 400重组后的携带有节目专用信息的实吋传输协 议报文的序列号与携带有媒体数据的实吋传输协议报文的序列号是连续的, 而 且, 如果对实吋传输协议报文的序列号进行排序的话, 携带有节目专用信息的 实吋传输协议报文的序列号应该先于携带有媒体数据的实吋传输协议报文的序 列号。 举例来说, 如果携带有媒体数据的实吋传输协议报文的起始序列号为N、 且携带有节目专用信息的实吋传输协议报文的数量为 1, 则携带有节目专用信息 的实吋传输协议报文的序列号为 N-l。
[82] 举例来说, 第一切换处理模块 400重组后的携带有节目专用信息的实吋传输协 议报文可以为 1个或多个, 当携带有节目专用信息的实吋传输协议报文为多个吋 , 第一切换处理模块 400在重组实吋传输协议报文吋, 不但应该使携带有节目专 用信息的实吋传输协议报文的序列号与携带有媒体数据的实吋传输协议报文的 序列号连续, 而且, 还应该使携带有节目专用信息的各实吋传输协议报文的序 列号不相同且也应该连续。 举例来说, 如果携带有媒体数据的实吋传输协议报 文的起始序列号为 N、 且第一切换处理模块 400重组后的携带有节目专用信息的 实吋传输协议报文的数量为 2, 则第一切换处理模块 400应该使这两个携带有节 目专用信息的实吋传输协议报文的序列号分别为 N-1和 N-2。
[83] 举例来说, 本实施例中涉及到的流特征可以釆用现有技术中记载的流特征, 例 如, 流特征包括: 源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口、 实 吋传输协议的负荷类型以及 SSRC等。 本实施例不限制流特征具体包括的内容。
[84] 第一发送模块 410, 用于向终端设备发送第一切换处理模块 400重组后的携带有 节目专用信息的实吋传输协议报文, 之后, 向终端设备发送携带有媒体数据的 实吋传输协议报文。 也就是说, 第一发送模块 410将节目专用信息和利用该节目 专用信息进行解码的媒体数据通过具有相同流特征的传输流进行传输。 举例来 说, 第一发送模块 410可以在向终端设备发送频道切换响应消息后, 向终端设备 发送携带有节目专用信息的实吋传输协议报文。 第一发送模块 410在向终端设备 发送携带有节目专用信息的实吋传输协议报文之前, 可以先向终端设备发送的 频道切换响应消息, 该频道切换响应消息中携带有通知终端设备实吋传输协议 报文的起始序列号为携带有节目专用信息的实吋传输协议报文的序列号的信息 。 这里的终端设备可以为 STB, 也可以为集成了 STB功能的家庭网关等设备。
[85] 举例来说, 上述第一切换处理模块 400包括: 第一获取子模块 401、 第一序列号 分配子模块 402和第一重组子模块 403。
[86] 第一获取子模块 401, 用于在其所在装置接收到终端设备发送来的频道切换请 求后, 获取用于对媒体数据流进行解码的节目专用信息。 举例来说, 第一获取 子模块 401在其所在的装置接收到终端设备发送来的频道切换请求后, 可以先根 据频道切换请求确定频道切换的目标节目, 然后, 判断是否存在频道切换的目 标节目, 如果存在目标节目, 则从缓存中获取该目标节目的节目专用信息。
[87] 第一序列号分配子模块 402, 用于为携带节目专用信息的实吋传输协议报文分 配序列号, 该序列号与携带媒体数据的实吋传输协议报文的序列号连续, 且针 对序列号的排序, 携带有节目专用信息的实吋传输协议报文的序列号先于携带 有媒体数据的实吋传输协议报文的序列号。 如果携带有媒体数据的实吋传输协 议报文的起始序列号为N、 且携带有节目专用信息的实吋传输协议报文的数量为 1, 则第一序列号分配子模块 402为携带有节目专用信息的实吋传输协议报文分 配的序列号为 N-l。 如果携带有媒体数据的实吋传输协议报文的起始序列号为 N 、 且携带有节目专用信息的实吋传输协议报文的数量为 2, 则第一序列号分配子 模块 402为两个携带有节目专用信息的实吋传输协议报文分配的序列号分别为 N- 1和 N-2。
[88] 第一重组子模块 403, 用于将第一获取子模块 401获取的节目信息重组为实吋传 输协议报文, 该重组的实吋传输协议报文的序列号为第一序列号分配子模块 402 分配的序列号, 而且, 第一重组子模块 403可以利用媒体数据对应的流特征对节 目专用信息进行实吋传输协议报文的重组, 第一重组子模块 403重组后的实吋传 输协议报文与携带有媒体数据的实吋传输协议报文具有相同的流特征。
[89] 从上述实施例四的描述可知, 第一切换处理模块 400通过将节目专用信息重组 为实吋传输协议报文, 并且使该实吋传输协议报文的流特征与携带有媒体数据 的实吋传输协议报文的流特征相同, 这样, 第一发送模块 410通过向终端设备发 送携带有节目专用信息的实吋传输协议报文之后, 再向终端设备发送携带有媒 体数据的实吋传输协议报文, 可以使节目专用信息可以先于媒体数据到达终端 设备, 从而避免了终端设备对接收到的媒体数据不能正常解码的现象, 同吋, 也避免了等待节目专用信息对媒体数据进行解码的现象; 进而实施例四避免了 出现画面花屏或者停滞或者黑屏等现象, 并且避免了节目专用信息对频道切换 吋延的影响。 第一切换处理模块 400通过使携带有节目专用信息的实吋传输协议 报文的序列号与携带有媒体数据的实吋传输协议报文的序列号连续, 避免了请 求重传实吋传输协议报文的过程。 由于实施例四能够避免解码专用信息对频道 切换吋延的影响, 因此, 实施例四的频道切换装置可以实现频道的快速切换, 从而实施例四中的频道切换装置可以实现快速频道切换, 实施例四的频道切换 装置可以称为快速频道切换装置。
[90] 实施例五、 频道切换系统。 该系统的示意图如附图 5所示。
[91] 图 5中的系统包括: 服务器 500和终端设备 510。 服务器 500可以称为频道切换服 务器, 服务器 500可以设置于接入交换机中, 也可以设置于路由器中, 还可以设 置于汇聚交换机和路由器中。 终端设备 510可以为 STB, 也可以为集成了 STB功 能的家庭网关等其他设备。 图 5的系统中虽然只示出了一个终端设备 510, 显然 的, 该系统中可以包括多个终端设备 510。
[92] 服务器 500, 用于在频道切换过程中, 将用于对媒体数据流进行解码的节目专 用信息重组为实吋传输协议报文, 该实吋传输协议报文的流特征与携带有媒体 数据的实吋传输协议报文的流特征相同; 服务器 500向终端设备 510发送携带有 节目专用信息的实吋传输协议报文, 之后, 服务器 500发送携带有媒体数据的实 吋传输协议报文。 这里的媒体数据可以为频道切换的目标节目的媒体数据。
[93] 服务器 500可以从其存储的信息中获取频道切换的目标节目的节目专用信息。
服务器 500可以从其接收到的频道组播媒体流中获取节目专用信息, 并存储。 另 夕卜, 服务器 500可以在接收到节目源端设备发送来的频道组播媒体流后, 从频道 组播媒体流中获取节目专用信息并存储, 也可以从频道组播媒体流中获取包含 节目专用信息的传输流包, 并存储该传输流包。 当服务器 500存储的是包含节目 专用信息的传输流包吋, 服务器 500在重组实吋传输协议报文吋, 可以直接获取 包含有节目专用信息的传输流包, 并将该传输流包重组为实吋传输协议报文。
[94] 服务器 500重组后的携带有节目专用信息的实吋传输协议报文的序列号与携带 有媒体数据的实吋传输协议报文的序列号是连续的, 而且, 如果对实吋传输协 议报文的序列号进行排序的话, 携带有节目专用信息的实吋传输协议报文的序 列号应该先于携带有媒体数据的实吋传输协议报文的序列号。 举例来说, 如果 携带有媒体数据的实吋传输协议报文的起始序列号为 N、 且携带有节目专用信息 的实吋传输协议报文的数量为 1, 则服务器 500应该使重组后的携带有节目专用 信息的实吋传输协议报文的序列号为 N- 1。
[95] 服务器 500重组后的携带有节目专用信息的实吋传输协议报文可以为 1个或多个 , 当携带有节目专用信息的实吋传输协议报文为多个吋, 服务器 500在重组实吋 传输协议报文吋, 不但应该使携带有节目专用信息的实吋传输协议报文的序列 号与携带有媒体数据的实吋传输协议报文的序列号连续, 而且, 还应该使携带 有节目专用信息的各实吋传输协议报文的序列号不相同且也应该连续。 举例来 说, 如果携带有媒体数据的实吋传输协议报文的起始序列号为N、 且服务器 500 重组后的携带有媒体数据的实吋传输协议报文的数量为 2, 则服务器 500应该使 这两个携带有媒体数据的实吋传输协议报文的序列号分别为 N-1和 N-2。
[96] 服务器 500还需要通知终端设备实吋传输协议报文的起始序列号为携带有节目 专用信息的实吋传输协议报文的序列号, 该通知信息可以携带在向终端设备发 送的频道切换响应消息中。
[97] 需要说明的是, 本实施例中涉及到的流特征可以釆用现有技术中记载的流特征 , 例如, 流特征包括: 源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口 、 实吋传输协议的负荷类型以及 SSRC等。 本实施例不限制流特征具体包括的内 容。
[98] 服务器 500的结构可以如上述实施例四中的描述, 在此不再重复描述。 [99] 终端设备 510, 用于接收服务器 500发送来的实吋传输协议报文, 从接收到的实 吋传输协议报文中获取节目专用信息, 并利用节目专用信息对接收到的实吋传 输协议报文中携带的媒体数据进行解码。 这里的媒体数据为频道切换的目标节 目的媒体数据。
[100] 终端设备 510可以从接收到的一个或多个实吋传输协议报文中获取节目专用信 息, 也就是说, 终端设备 510接收到的一个或多个实吋传输协议报文中携带有节 目专用 ί曰息。
[101] 终端设备 510可以根据服务器 500的通知信息获知实吋传输协议报文的起始序列 号为携带有节目专用信息的实吋传输协议报文的序列号, 例如, 终端设备 510可 以根据接收到的频道切换响应消息携带的信息获知实吋传输协议报文的起始序 列号为携带有节目专用信息的实吋传输协议报文的序列号。
[102] 实施例六、 频道切换方法。 该方法的流程如附图 6所示。
[103] 图 6中, S600、 从接收到的频道组播媒体流中获取包含有节目专用信息的传输 流包, 并存储该传输流包。 这里的节目专用信息用于对媒体数据进行解码。
[104] S610、 在频道切换过程中, 从存储的信息中获取包含有节目专用信息的传输流 包, 并将该传输流包重组为实吋传输协议报文。 这里的节目专用信息为频道切 换的目标节目的节目专用信息。 携带有节目专用信息的实吋传输协议报文的流 特征与携带有所述媒体数据的实吋传输协议报文的流特征相同。 携带有节目专 用信息的实吋传输协议报文的序列号与携带有所述媒体数据的实吋传输协议报 文的序列号连续, 且针对序列号的排序, 携带有节目专用信息的实吋传输协议 报文的序列号先于携带有媒体数据的实吋传输协议报文的序列号。 本步骤可以 使节目专用信息和需要利用该节目专用信息进行解码的媒体数据通过具有相同 流特征的传输流进行传输。
[105] 具体的说, 在接收到终端设备发送来的频道切换请求后, 可以先根据频道切换 请求确定频道切换的目标节目, 然后, 判断是否存在频道切换的目标节目, 如 果存在目标节目, 则从缓存中获取包含该目标节目的节目专用信息的传输流包 , 并利用目标节目的媒体数据对应的流特征将获取到的传输流包重组为实吋传 输协议报文, 使重组后的实吋传输协议报文与携带有媒体数据的实吋传输协议 报文具有相同的流特征。
[106] 携带有包含节目专用信息的传输流包的实吋传输协议报文可以为 1个或多个。
如果携带有媒体数据的实吋传输协议报文的起始序列号为N、 且携带有包含节目 专用信息的传输流包的实吋传输协议报文的数量为 1, 则携带有包含节目专用信 息的传输流包的实吋传输协议报文的序列号为 N-l。 如果携带有媒体数据的实吋 传输协议报文的起始序列号为N、 且携带有包含节目专用信息的传输流包的实吋 传输协议报文的数量为 2, 则这两个携带有包含节目专用信息的传输流包的实吋 传输协议报文的序列号分别为 N-1和 N-2。
[107] 需要说明的是, 本实施例中涉及到的流特征可以釆用现有技术中记载的流特征 , 例如, 流特征包括: 源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口 、 实吋传输协议的负荷类型以及 SSRC等。 本实施例不限制流特征具体包括的内 容。
[108] S620、 向终端设备发送携带有节目专用信息的实吋传输协议报文。 具体的, 可 以在向终端设备发送频道切换响应消息后, 向终端设备发送携带有节目专用信 息的实吋传输协议报文。 向终端设备发送的频道切换响应消息中可以携带有通 知终端设备实吋传输协议报文的起始序列号为携带有节目专用信息的实吋传输 协议报文的序列号的信息, 这样, 终端设备在接收到频道切换响应消息后可以 获知其接收的实吋传输协议报文的起始序列号, 如 N-2等。
[109] S630、 向终端设备发送携带有媒体数据的实吋传输协议报文。 这里的媒体数据 为频道切换的目标节目的媒体数据。 携带有媒体数据的实吋传输协议报文的流 特征与上述携带有节目专用信息的实吋传输协议报文的流特征相同。
[110] 实施例六的执行主体在逻辑上可以称为频道切换服务器, 举例来说, 该频道切 换服务器可以为一个独立的网络设备, 也可以与网络中的其他逻辑功能合设, 例如, 频道切换服务器设置于接入交换机中, 或者设置于路由器中, 或者设置 于汇聚交换机和路由器中。 实施例六中的终端设备可以为 Set Top
Box (机顶盒, STB) , 也可以为其他设备, 如集成了 STB功能的家庭网关等。
[111] 从上述实施例六的描述可知, 通过从接收到的频道组播媒体流中获取包含有将 节目专用信息的传输包, 并将该传输包重组为实吋传输协议报文, 可以方便的 将节目专用信息重组为实吋传输协议报文; 通过使该实吋传输协议报文的流特 征与携带有媒体数据的实吋传输协议报文的流特征相同, 这样, 通过向终端设 备发送携带有节目专用信息的实吋传输协议报文之后, 再向终端设备发送携带 有媒体数据的实吋传输协议报文, 可以使节目专用信息可以先于媒体数据到达 终端设备, 从而可以避免终端设备对接收到的媒体数据不能正常解码的现象, 同吋, 也可以避免等待节目专用信息对媒体数据进行解码的现象; 进而实施例 六可以避免出现画面花屏或者停滞或者黑屏等现象, 并且可以避免节目专用信 息对频道切换吋延的影响。 通过使携带有节目专用信息的实吋传输协议报文的 序列号与携带有媒体数据的实吋传输协议报文的序列号连续, 可以避免请求重 传实吋传输协议报文的过程。 由于实施例六可以避免解码专用信息对频道切换 吋延的影响, 因此, 实施例六可以实现频道的快速切换, 从而实施例六中的频 道切换方法可以称为快速频道切换方法, 实施例六中的频道切换服务器可以称 为快速频道切换服务器。
[112] 实施例七、 频道切换装置。 该装置在逻辑上可以称为频道切换服务器, 该装置 可以设置于接入交换机中, 也可以设置于路由器中, 还可以设置于汇聚交换机 和路由器中。 该装置的示意图如附图 7所示。
[113] 图 7中的装置包括: 获取传输流包模块 700、 第二切换处理模块 710和第二发送 模块 720。
[114] 获取传输流包模块 700, 用于从接收到的频道组播媒体流中获取包含有节目专 用信息的传输流包, 并存储该传输流包。 这里的节目专用信息用于对媒体数据 进行解码。 这里的频道组播媒体流可以是节目的源端设备发送来的。
[115] 第二切换处理模块 710, 用于在频道切换过程中, 将从存储的信息中获取的包 含有节目专用信息的传输流包重组为实吋传输协议报文。 这里的节目专用信息 为频道切换的目标节目的节目专用信息。
[116] 第二切换处理模块 710在进行实吋传输协议报文重组吋, 可以使用携带有媒体 数据的实吋传输协议报文的流特征。 也就是说, 携带有节目专用信息的实吋传 输协议报文的流特征与携带有所述媒体数据的实吋传输协议报文的流特征相同 。 另外, 第二切换处理模块 710重组的携带有节目专用信息的实吋传输协议报文 的序列号与携带有所述媒体数据的实吋传输协议报文的序列号连续, 且针对序 列号的排序, 携带有节目专用信息的实吋传输协议报文的序列号先于携带有媒 体数据的实吋传输协议报文的序列号。
[117] 第二切换处理模块 710可以使节目专用信息和需要利用该节目专用信息进行解 码的媒体数据通过具有相同流特征的传输流进行传输。 第二切换处理模块 710可 以在接收到终端设备发送来的频道切换请求后, 先根据频道切换请求确定频道 切换的目标节目, 然后, 判断是否存在频道切换的目标节目, 如果存在目标节 目, 则从存储的信息中获取包含该目标节目的节目专用信息的传输流包, 并利 用目标节目的媒体数据对应的流特征将获取到的传输流包重组为实吋传输协议 报文, 使重组后的实吋传输协议报文与携带有媒体数据的实吋传输协议报文具 有相同的流特征。
[118] 第二切换处理模块 710重组的携带有包含节目专用信息的传输流包的实吋传输 协议报文可以为 1个或多个。 如果携带有媒体数据的实吋传输协议报文的起始序 列号为 N、 且携带有包含节目专用信息的传输流包的实吋传输协议报文的数量为 1, 则第二切换处理模块 710重组后的携带有包含节目专用信息的传输流包的实 吋传输协议报文的序列号可以为 N-l。 如果携带有媒体数据的实吋传输协议报文 的起始序列号为N、 且携带有包含节目专用信息的传输流包的实吋传输协议报文 的数量为 2, 则第二切换处理模块 710重组后的携带有包含节目专用信息的传输 流包的两个实吋传输协议报文的序列号可以分别为 N-1和 N-2。
[119] 需要说明的是, 本实施例中涉及到的流特征可以釆用现有技术中记载的流特征 , 例如, 流特征包括: 源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口 、 实吋传输协议的负荷类型以及 SSRC等。 本实施例不限制流特征具体包括的内 容。
[120] 上述第二切换处理模块 710可以包括: 第二获取子模块 711、 第二序列号分配子 模块 712和第二重组子模块 713。
[121] 第二获取子模块 711, 用于在其所在装置接收到终端设备发送来的频道切换请 求后, 从存储的信息中获取包含有节目专用信息的传输流包。 具体的说, 第二 获取子模块 711在其所在的装置接收到终端设备发送来的频道切换请求后, 可以 先根据频道切换请求确定频道切换的目标节目, 然后, 判断是否存在频道切换 的目标节目, 如果存在目标节目, 则从存储的信息中获取包含该目标节目的节 目专用信息的传输流包。
[122] 第二序列号分配子模块 712, 用于为携带节目专用信息的实吋传输协议报文分 配序列号, 该序列号与携带媒体数据的实吋传输协议报文的序列号连续, 且针 对序列号的排序, 携带有节目专用信息的实吋传输协议报文的序列号先于所述 携带有媒体数据的实吋传输协议报文的序列号。 如果携带有媒体数据的实吋传 输协议报文的起始序列号为 N、 且携带有节目专用信息的实吋传输协议报文的数 量为 1, 则第二序列号分配子模块 712为携带有节目专用信息的实吋传输协议报 文分配的序列号为 N-l。 如果携带有媒体数据的实吋传输协议报文的起始序列号 为N、 且携带有节目专用信息的实吋传输协议报文的数量为 2, 则第二序列号分 配子模块 712为两个携带有节目专用信息的实吋传输协议报文分配的序列号分别 为 N-1和 N-2。
[123] 第二重组子模块 713, 用于将第二获取子模块 711获取的传输流包重组为实吋传 输协议报文, 重组的实吋传输协议报文的序列号为序列号分配子模块 712分配的 序列号, 第二重组子模块 713可以利用媒体数据对应的流特征对包含节目专用信 息的传输流包进行实吋传输协议报文的重组, 重组后的实吋传输协议报文的流 特征与携带有媒体数据的实吋传输协议报文的流特征相同。 这里的媒体数据为 目标节目的媒体数据。
[124] 第二发送模块 720, 用于向终端设备发送携带有节目专用信息的实吋传输协议 报文, 之后, 向所述终端设备发送携带有媒体数据的实吋传输协议报文。 第二 发送模块 720可以在向终端设备发送频道切换响应消息后, 向终端设备发送携带 有节目专用信息的实吋传输协议报文。 第二发送模块 720在向终端设备发送携带 有节目专用信息的实吋传输协议报文之前, 可以先向终端设备发送的频道切换 响应消息, 该频道切换响应消息中携带有通知终端设备实吋传输协议报文的起 始序列号为携带有节目专用信息的实吋传输协议报文的序列号的信息。
[125] 实施例八、 频道切换系统。 该系统的示意图如附图 8所示。
[126] 图 8中的系统包括: 服务器 800和终端设备 810。 服务器 800可以称为频道切换服 务器, 服务器 800可以设置于接入交换机中, 也可以设置于路由器中, 还可以设 置于汇聚交换机和路由器中。 终端设备 810可以为 STB, 也可以为集成了 STB功 能的家庭网关等其他设备。 图 8的系统中虽然只示出了一个终端设备 810, 显然 的, 该系统中可以包括多个终端设备 810。
[127] 服务器 800, 用于从接收到的频道组播媒体流中获取包含有节目专用信息的传 输流包, 并存储传输流包, 这里的节目专用信息用于对媒体数据进行解码, 在 频道切换过程中, 服务器 800从存储的信息中获取传输流包, 并将从存储的信息 中获取的传输流包重组为实吋传输协议报文。 这里的频道组播媒体流可以是节 目源端设备发送来的。
[128] 服务器 800重组后的携带有节目专用信息的实吋传输协议报文的序列号与携带 有媒体数据的实吋传输协议报文的序列号是连续的, 而且, 如果对实吋传输协 议报文的序列号进行排序的话, 携带有节目专用信息的实吋传输协议报文的序 列号可以先于携带有媒体数据的实吋传输协议报文的序列号。 举例来说, 如果 携带有媒体数据的实吋传输协议报文的起始序列号为 N、 且携带有节目专用信息 的实吋传输协议报文的数量为 1, 则服务器 800可以使重组后的携带有节目专用 信息的实吋传输协议报文的序列号为 N- 1。
[129] 服务器 800重组后的携带有节目专用信息的实吋传输协议报文可以为 1个或多个 , 当携带有节目专用信息的实吋传输协议报文为多个吋, 服务器 800在重组实吋 传输协议报文吋, 使携带有节目专用信息的实吋传输协议报文的序列号与携带 有媒体数据的实吋传输协议报文的序列号连续, 并且可以使携带有节目专用信 息的各实吋传输协议报文的序列号不相同且也连续。 举例来说, 如果携带有媒 体数据的实吋传输协议报文的起始序列号为N、 且服务器 800重组后的携带有媒 体数据的实吋传输协议报文的数量为 2, 则服务器 800可使这两个携带有媒体数 据的实吋传输协议报文的序列号分别为 N-1和 N-2。
[130] 服务器 800还需要通知终端设备实吋传输协议报文的起始序列号为携带有节目 专用信息的实吋传输协议报文的序列号, 该通知信息可以携带在向终端设备发 送的频道切换响应消息中, 例如, 通知终端设备实吋传输协议报文的起始序列 号为 N-2等。 [131] 需要说明的是, 本实施例中涉及到的流特征可以釆用现有技术中记载的流特征 , 例如, 流特征包括: 源 IP地址、 目的 IP地址、 IP协议类型、 源端口、 目的端口 、 实吋传输协议的负荷类型以及 SSRC等。 本实施例不限制流特征具体包括的内 容。
[132] 服务器 800的结构可以如上述实施例七中的描述, 在此不再重复描述。
[133] 终端设备 810, 用于从接收服务器 800发送来的实吋传输协议报文, 从接收到的 实吋传输协议报文中获取节目专用信息, 并利用节目专用信息对接收到的实吋 传输协议报文中携带的媒体数据进行解码。 这里的媒体数据为频道切换的目标 节目的媒体数据。
[134] 终端设备 810可以从接收到的一个或多个实吋传输协议报文中获取节目专用信 息, 也就是说, 终端设备 810接收到的一个或多个实吋传输协议报文中携带有节 目专用 ί曰息。
[135] 终端设备 810可以根据服务器 800的通知信息获知实吋传输协议报文的起始序列 号为携带有节目专用信息的实吋传输协议报文的序列号, 例如, 终端设备 810可 以根据接收到的频道切换响应消息携带的信息获知实吋传输协议报文的起始序 列号为携带有节目专用信息的实吋传输协议报文的序列号。
[136] 通过以上的实施方式的描述, 本领域的技术人员可以清楚地了解到本发明可借 助软件加必需的硬件平台的方式来实现, 当然也可以全部通过硬件来实施, 但 很多情况下前者是更佳的实施方式。 基于这样的理解, 本发明的技术方案对背 景技术做出贡献的全部或者部分可以以软件产品的形式体现出来, 该计算机软 件产品可以存储在存储介质中, 如 ROM/RAM、 磁碟、 光盘等, 包括若干指令用 以使得一台计算机设备 (可以是个人计算机, 服务器, 或者网络设备等) 执行 本发明各个实施例或者实施例的某些部分所述的方法。
[137] 虽然通过实施例描绘了本发明, 本领域普通技术人员知道, 本发明有许多变形 和变化而不脱离本发明的精神, 本发明的申请文件的权利要求包括这些变形和 变化。

Claims

权利要求书
[1] 一种频道切换方法, 其特征在于, 包括:
在频道切换过程中, 将用于对媒体数据进行解码的节目专用信息重组为实 吋传输协议报文, 所述实吋传输协议报文的流特征与携带有所述媒体数据 的实吋传输协议报文的流特征相同;
向终端设备发送所述携带有节目专用信息的实吋传输协议报文; 向终端设备发送携带有所述媒体数据的实吋传输协议报文。
[2] 如权利要求 1所述的方法, 其特征在于, 所述携带有节目专用信息的实吋传 输协议报文的序列号与携带有所述媒体数据的实吋传输协议报文的序列号 连续, 且针对序列号的排序, 携带有节目专用信息的实吋传输协议报文的 序列号先于所述携带有媒体数据的实吋传输协议报文的序列号, 且所述方 法在向终端设备发送所述携带有节目专用信息的实吋传输协议报文之前还 包括:
通知终端设备实吋传输协议报文的起始序列号为所述携带有节目专用信息 的实吋传输协议报文的序列号。
[3] 如权利要求 1所述的方法, 其特征在于, 所述携带有节目专用信息的实吋传 输协议报文可以为 1个或多个, 当所述携带有节目专用信息的实吋传输协议 报文为多个吋, 携带有节目专用信息的各实吋传输协议报文的序列号不相 同且连续。
[4] 如权利要求 1或 2或 3所述的方法, 其特征在于, 所述在频道切换过程中, 将 用于对媒体数据流进行解码的节目专用信息重组为实吋传输协议报文包括
在接收到终端设备发送来的频道切换请求、 且确定存在频道切换的目标节 目后, 从缓存中获取节目专用信息或者获取包含有所述目标节目的节目专 用信息的传输流包, 将所述节目专用信息或者包含有节目专用信息的传输 流包重组为实吋传输协议报文。
[5] 一种频道切换装置, 其特征在于, 包括:
第一切换处理模块, 用于在频道切换过程中, 将用于对媒体数据流进行解 码的节目专用信息重组为实吋传输协议报文, 所述实吋传输协议报文的流 特征与携带有所述媒体数据的实吋传输协议报文的流特征相同; 第一发送模块, 用于向终端设备发送携带有节目专用信息的所述实吋传输 协议报文, 并向终端设备发送携带有媒体数据的实吋传输协议报文。
[6] 如权利要求 5所述的装置, 其特征在于, 所述第一切换处理模块包括: 第一获取子模块, 用于在所述装置接收到终端设备发送来的频道切换请求 后, 获取用于对媒体数据流进行解码的节目专用信息;
第一序列号分配子模块, 用于为携带所述节目专用信息的实吋传输协议报 文分配序列号, 所述序列号与携带所述媒体数据的实吋传输协议报文的序 列号连续, 且针对序列号的排序, 携带有节目专用信息的实吋传输协议报 文的序列号先于所述携带有媒体数据的实吋传输协议报文的序列号; 第一重组子模块, 用于将所述节目信息重组为实吋传输协议报文, 所述重 组的实吋传输协议报文的序列号为所述第一序列号分配子模块分配的序列 号;
且所述第一发送模块还用于, 通知终端设备实吋传输协议报文的起始序列 号为携带有节目专用信息的实吋传输协议报文的序列号。
[7] 一种频道切换系统, 其特征在于, 包括:
服务器, 用于在频道切换过程中, 将用于对媒体数据流进行解码的节目专 用信息重组为实吋传输协议报文, 所述实吋传输协议报文的流特征与携带 有所述媒体数据的实吋传输协议报文的流特征相同; 所述服务器发送所述 携带有节目专用信息的实吋传输协议报文, 并发送携带有所述媒体数据的 实吋传输协议报文;
终端设备, 用于从接收到的所述实吋传输协议报文中获取节目专用信息, 并利用所述节目专用信息对接收到的实吋传输协议报文中携带的媒体数据 进行解码。
[8] —种频道切换方法, 其特征在于, 包括:
从接收到的频道组播媒体流中获取包含有节目专用信息的传输流包并存储 , 所述节目专用信息用于对媒体数据进行解码; 在频道切换过程中, 从所述存储的信息中获取包含节目专用信息的传输流 包, 并重组为实吋传输协议报文;
向终端设备发送所述携带有节目专用信息的实吋传输协议报文; 向所述终端设备发送携带有所述媒体数据的实吋传输协议报文。
[9] 如权利要求 8所述的方法, 其特征在于:
所述携带有节目专用信息的实吋传输协议报文的流特征与携带有所述媒体 数据的实吋传输协议报文的流特征相同;
所述携带有节目专用信息的实吋传输协议报文的序列号与携带有所述媒体 数据的实吋传输协议报文的序列号连续, 且针对序列号的排序, 携带有节 目专用信息的实吋传输协议报文的序列号先于所述携带有媒体数据的实吋 传输协议报文的序列号;
所述方法在向终端设备发送所述携带有节目专用信息的实吋传输协议报文 之前还包括:
通知终端设备实吋传输协议报文的起始序列号为携带有节目专用信息的实 吋传输协议报文的序列号。
[10] 一种频道切换装置, 其特征在于, 包括:
获取传输流包模块, 用于从接收到的频道组播媒体流中获取包含有节目专 用信息的传输流包, 并存储, 所述节目专用信息用于对媒体数据进行解码 第二切换处理模块, 用于在频道切换过程中, 从所述获取传输流包模块存 储的信息中获取包含有节目专用信息的传输流包, 并重组为实吋传输协议 报文;
第二发送模块, 用于向终端设备发送所述携带有节目专用信息的实吋传输 协议报文, 之后, 向所述终端设备发送携带有媒体数据的实吋传输协议报 文。
[11] 如权利要求 10所述的装置, 其特征在于, 所述第二切换处理模块包括: 第二获取子模块, 用于在所述装置接收到终端设备发送来的频道切换请求 后, 从存储的信息中获取包含有节目专用信息的传输流包; 第二序列号分配子模块, 用于为携带所述节目专用信息的实吋传输协议报 文分配序列号, 所述序列号与携带所述媒体数据的实吋传输协议报文的序 列号连续, 且针对序列号的排序, 携带有节目专用信息的实吋传输协议报 文的序列号先于所述携带有媒体数据的实吋传输协议报文的序列号; 第二重组子模块, 用于将所述第二获取子模块获取的传输流包重组为实吋 传输协议报文, 所述重组的实吋传输协议报文的序列号为所述序列号分配 子模块分配的序列号, 所述重组后的实吋传输协议报文的流特征与携带有 所述媒体数据的实吋传输协议报文的流特征相同;
且所述第二发送模块还用于, 通知终端设备实吋传输协议报文的起始序列 号为携带有节目专用信息的实吋传输协议报文的序列号。
一种频道切换系统, 其特征在于, 包括:
服务器, 用于从接收到的频道组播媒体流中获取包含有节目专用信息的传 输流包, 并存储, 所述节目专用信息用于对媒体数据进行解码, 在频道切 换过程中, 从所述存储的信息中获取包含有节目专用信息的传输流包, 并 重组为实吋传输协议报文;
终端设备, 用于从接收到的所述实吋传输协议报文中获取节目专用信息, 并利用所述节目专用信息对接收到的实吋传输协议报文中携带的媒体数据
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