CN1859525A - Method for realizing stream media switching and stream media server - Google Patents

Abstract

The invention discloses a method for realizing streaming media switching. In a cell multicast (CMB) service, a local streaming media server receives a switching request from a local content management system (CMS) to start a local streaming media live broadcast, and stops the receiving center The live global streaming media is switched to receiving and forwarding the local live streaming media; after the local streaming media server detects that the local live broadcasting is completed, the local streaming media server ends the local live streaming service and switches back to receiving and forwarding the global streaming media . The invention also discloses a streaming media server, which realizes switching and playing of global/regional streaming media by setting a switching module in the local streaming media server for controlling the switching of global/regional streaming media live broadcasting. Through the solution of the invention, the switching of global/regional streaming media live broadcasting is realized, the timeliness of streaming media live broadcasting in the CMB service is ensured, and the requirements of local users are satisfied.

Description

A method and streaming media server for realizing streaming media switching

technical field

The invention relates to mobile communication broadcasting technology, in particular to a method and a streaming media server for realizing streaming media switching in a cell multicast (CMB, Cell Multiple Broadcast) service.

Background technique

The 3rd Generation Partnership Project Release 6 (3GPP R6) protocol can implement multimedia broadcast and multicast services, but the R6 protocol has not yet been formulated, and it will take a long time for mature products to be launched on the market. Wideband Code Division Multiple Access (WCDMA) products of R99 and R4 protocols have been commercialized, but they can only provide point-to-point live streaming and on-demand services for each user.

In view of this, the prior art provides Cell Multiple Broadcast (CMB, Cell Multiple Broadcast) service, which can realize broadcast/multicast service in WCDMA R99, R4 protocol products.

The CMB service is a simplified Multimedia Broadcast/Multicast Service (MBMS) service aimed at the WCDMA system, and its characteristic is to carry out the wireless multicast service on the existing WCDMA system. The advantage of the CMB service is that one broadcast streaming media can meet the needs of multiple user terminals, avoiding the problem of occupying a large amount of wireless bandwidth in the currently adopted unicast (splitting) mode. The CMB wireless multicast network consists of content providers/service providers (CP/SP), mobile operators and mobile terminal users. Among them, CP/SP organizations provide streaming media sources, mobile operators provide wireless multicast network environment and streaming media transmission capabilities, and mobile terminal users consume CMB services through obtaining streaming media. At present, the most suitable service for CMB business is mobile terminal TV, such as mobile TV, which uses the multicast function of the wireless environment to provide mobile terminal users with TV broadcasting services and realize live streaming.

Live streaming in the CMB service includes central live streaming and local live streaming, both of which can only play programmed content and cannot play new content in real time. For example, when an emergency event occurs in a certain area, the emergency event cannot be released to the public immediately, but the content of the emergency event can only be played by adjusting the program schedule. At present, live streaming of CMB services lacks timeliness.

Fig. 1 is a schematic diagram of the prior art center/local streaming media live broadcasting principle, as shown in Fig. /SP releases the live broadcast through the CMS and controls the streaming media system to start the live broadcast, and the streaming media system produces streaming media content and publishes the streaming media. Among them, the streaming media system is composed of a live encoder and a streaming media server. The streaming media server includes two parts: a media creator subsystem and a media service subsystem: the media creator subsystem is responsible for collecting video and audio analog signals , convert the collected analog signal into a digital signal, and convert the digital signal into a real-time transport protocol (RTP) media stream conforming to the 3GPP/MP4 specification through a live encoder, and send the RTP media stream in the form of unicast or multicast, Or convert the source media file into a media file conforming to the 3GPP/MP4 specification by an offline encoder and store it in the central content storage; the analog live broadcast device in the media service subsystem is based on the generated analog live channel table, Convert the media files stored in the central content library into video and audio data, and send the data in the form of unicast or multicast. As shown in Figure 1, the center includes a central CP/SP, a central CMS, and a central streaming media system, and the local includes a local CP/SP, a local CMS, and a local streaming media system.

In Fig. 1, the thick single arrow curve represents the transmission direction of the central streaming media live broadcast, and the central CP/SP starts to send streaming media through the control module in the central CMS control center streaming media server; the central CP/SP receives the central streaming media server After the start-up response of the control module, the control center streaming media server starts the central live encoder; afterward, under the control of the central CMS, the central live encoder sends live media data to the media delivery module in the central streaming server, and the central streaming server The media transmission module in the system receives media data and forwards it to the local streaming media server. The local streaming media server forwards the media data from the central streaming media server to the user terminal through the wireless network to complete the global streaming media live broadcast and realize the global CMB service. Fig. 1 does not show that the central streaming media server includes a control module and a media transmission module.

Specifically, the center-to-local center streaming media live broadcast includes two types: center live broadcast and center simulated live broadcast. Among them, the central live broadcast is to convert the analog signals from satellite TV, analog TV, ordinary camera and other types of video and audio equipment into digital video and audio signals and encode them into RTP media streams in accordance with 3GPP/MP4 specifications in real time, and broadcast them in unicast or multicast The format is sent to the local streaming media system with the specified IP address; the center simulates the live broadcast to convert the source media files such as mpeg2, avi or mpeg1 files into the target media files conforming to the 3GPP/MP4 specification such as 3gp or mp4 files, in unicast or group The broadcast form is sent to the local streaming media system with the specified IP address.

In Figure 1, the dotted curve of the thick single arrow indicates the transmission direction of the local live streaming media. The local live streaming media implements the regional CMB service. The specific implementation is consistent with the central streaming media live broadcasting and will not be repeated here. The local streaming media system sends the received central streaming media live broadcast or local streaming media live broadcast to the radio network controller (RNC); the RNC sends the received streaming media live broadcast to the designated multicast IP address and port; the user terminal sends The RNC sends an on-demand request to obtain the multicast IP address and port, and after joining the multicast group, the media stream can be obtained through the multicast IP address and port. The local streaming media live broadcast also includes local live broadcast and local simulated live broadcast. The specific implementation is the same as that of the central live broadcast and the central simulated live broadcast respectively. It will not be detailed here, but the relevant physical entities are located in different geographical locations. It should be noted that the local streaming media server also includes a control module and a media sending module, which are not shown in FIG. 1 . The control module in the local streaming media server receives the control from the local CMS, and the media sending module in the local streaming media server is used to forward the streaming media from the central streaming media server or the local live encoder to the user.

For the local streaming media system, either forward the media data from the central streaming media server to realize the global CMB service; or forward the media data from the local live encoder to the user terminal through the wireless network to realize the regional CMB service. They are not related to each other, exist independently and can only exist in one way at the same time. When the local streaming media system forwards the central streaming media, even if an emergency occurs locally in a certain area, the emergency event cannot be released to the public immediately, which makes the streaming media live broadcast in the CMB service lack of timeliness.

From the point of view of the streaming media live broadcast method in the prior art CMB business, the streaming media live broadcast can only play the content that has been edited, and cannot play new content in real time. Global/regional live streaming cannot be switched. When an emergency event occurs in a certain area, such as emergency announcements, local featured advertisements, local news, etc., the system cannot immediately release the emergency event to the public, making live streaming in the CMB business lack of timeliness. Can not meet the needs of local users.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for realizing streaming media switching, which can realize the switching of global/regional streaming media live broadcasting, and ensure the timeliness of streaming media live broadcasting in the CMB service, thereby meeting the needs of local users.

Another object of the present invention is to provide a streaming media server, which can realize the switching of global/regional live streaming media, and ensure the timeliness of streaming media live streaming in the CMB service, so as to meet the needs of local users.

In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:

A method for realizing streaming media switching, the method comprising:

The local streaming media server receives the switching request from the local content management system CMS to start the local live streaming media, stops receiving the live streaming media of the center, and receives and forwards the local live streaming media.

Before the local streaming media server receives the switch request, the method further includes: the local streaming media server receives and forwards the live streaming media of the center.

The method further includes: after the local streaming media server stops receiving the streaming media broadcast live by the center, sending a switching success response to the local CMS.

The method also includes:

After the local streaming media server detects that the local live streaming media playback is completed, the local streaming media server ends the local live streaming, and receives and forwards the central live streaming media.

The method further includes: the local streaming media server sends a switching completion response to the local CMS after receiving the live streaming media from the center.

The switching request includes: streaming media start time, streaming media identifier, streaming media name, streaming media type and streaming media playing path.

When the local system time reaches the playing start time, the local streaming media server stops receiving the live streaming media of the center, and receives and forwards the local live streaming media.

The switching request further includes: the English name of the streaming media, and/or the start time of the streaming media segment, and/or the playback duration of the streaming media.

The switching request includes streaming media start time and streaming media playback duration, and the method for detecting the completion of local live streaming media playback is:

According to the streaming media start playing time and the streaming media playing duration, the end playing time is obtained, and whether the local streaming media server real-time monitors whether the system time reaches the ending playing time, and when the system time reaches the ending playing time, the local streaming media The server detects that the streaming media playback of the local live broadcast is completed;

Or when the streaming media playing duration arrives, the local streaming media server detects that the local live streaming media playing is completed.

A streaming media server, including a control module and a media transmission module, is further provided with a switching module for controlling global/regional live streaming switching;

It is used for notifying the media delivery module to stop receiving streaming media from the central streaming media system, and to receive and forward streaming media from the local live streaming encoder when receiving a switch request from the local CMS to start the local streaming media live broadcast.

A connection for the switching module to send a switching success response or a switching completion response to the local CMS is set between the switching module and the local CMS.

The switching module is an independent module, or the switching module is a logical function module added to the control module with the function of controlling global/regional streaming live broadcast switching.

It can be seen from the above technical scheme that the present invention is based on the CMB wireless multicast network environment, and a switching module for controlling global/regional streaming live switching is set in the local streaming server. The switching module can be an independent module, or it can be an existing There is a logical function module added in the control module with the function of controlling global/regional streaming media live switching; when the local streaming server receives and forwards the central streaming media to realize the global CMB service, if the switching module or control in the local streaming server The module receives the switching request from the local CMS to start the local live streaming, and the switching module or control module controls the existing media delivery module in the streaming server to stop receiving the live streaming of the center and switch to receiving and forwarding the local live streaming. Streaming media, and send the switching success response to local CMS; After the local streaming media server detects that the local live broadcasting is completed according to the switching request, the switching module or the control module control the media delivery module to end the local live broadcasting service, switch back to receiving and The forwarding center broadcasts the streaming media, and sends a switch success response to the local CMS, notifying the local live broadcast that the real-time switching service is completed.

According to the solution of the present invention, local operators can carry out regional CMB services on their own on the basis of providing global CMB services, and use streaming media live broadcast channels that already have a certain influence to deliver new content in real time, through the switching of global/regional live streaming media , which ensures the timeliness of streaming media live broadcast in the CMB service, thereby meeting the needs of local users. The CMB service mentioned in the present invention may be a mobile TV service or the like.

Description of drawings

Fig. 1 is a schematic diagram of the prior art center/local live streaming principle;

Fig. 2 is a schematic diagram of the present invention center/local streaming media switching principle;

Fig. 3 is a flow chart of the present invention for realizing center/local streaming media switching.

Detailed ways

The core idea of the present invention is: the local stream media server receives the switching request from the start local stream media live broadcast of local CMS, stops receiving the global stream media of center live broadcast, receives and forwards the area stream media of local live broadcast; In local stream media server After detecting that the local live broadcast is completed, the local streaming media server ends the local live broadcast service, receives and forwards the global streaming media.

The present invention realizes the switching and playing of the global/regional streaming media by setting a switching module for controlling the switching of the global/regional streaming media live broadcast in the local streaming media server.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

Fig. 2 is a schematic diagram of the center/local streaming media switching principle of the present invention, a switching module for controlling global/regional live streaming switching is set in the local streaming server, the switching module can be an independent module, or can be in an existing control The logical function module added in the module has the function of controlling global/regional live streaming switching. It is assumed here that the switching module is an independent module.

As shown in Figure 2, if the switching module in the local streaming media server receives the switching request from the local CMS to start the local streaming media live broadcast, the switching module controls the existing media transmission module in the streaming media server according to the switching request to stop receiving The global streaming media from the central streaming media system receives and forwards the regional streaming media from the local live encoder to the user; after the switching module completes the switching, it sends a switching success response to the local CMS; when the switching module detects the local live broadcasting according to the switching request After completion, control the media transmission module to end the local live broadcast, switch back to receive and forward the global streaming media of the center live broadcast to the user, and send a switching completion response to the local CMS, indicating that the local live broadcast real-time switching service is completed.

Fig. 3 is the flow chart that the present invention realizes center/local streaming media switch, in conjunction with Fig. 2, describe the method for streaming media switching of the present invention in detail:

Step 300～Step 301: After the central streaming media server receives the streaming media request from the central CMS to start the central live streaming, under the control of the central CMS, the central live streaming encoder transmits the streaming media via the central streaming media server and the local streaming media server. The data is forwarded to the user to realize the global CMB service. These two steps realize the global streaming media live broadcast, and the specific implementation belongs to the prior art, and will not be described in detail here.

Steps 302 to 303: The local CMS sends a switching request to the local streaming server to start the local live streaming. The local streaming server analyzes the switching request, and when the local system time reaches the switching time, it suspends the live streaming of the receiving center and switches For receiving and forwarding local live streaming.

The following attribute items can be carried in the switching request:

Playback start time, which indicates the absolute time when the streaming media starts to play. This attribute item is mandatory and can be expressed in character type. The format can be year-month-day hour:minute:second (yy-mm-ddhh:mm:ss ). For the carousel mode, this attribute can be empty. When the attribute value of this item is 00-00-0000:00:00, it means playing immediately;

Streaming media identifier, which is used to identify a globally unique streaming media file or RTP streaming media. This attribute item is mandatory and can be expressed in character type. For example, if the RTP streaming media is a mobile TV program, then the streaming media logo is the live program logo;

The name of the streaming media is used to identify the name of the streaming media file or RTP streaming media. This attribute item is mandatory and can be expressed in characters. For example, if the RTP streaming media is a mobile TV program, the name of the streaming media is the name of the live program;

Streaming media type, which is used to identify whether the live broadcast is a streaming media file or RTP streaming media. This attribute item is mandatory and can be represented by an integer. For example: when the value of this attribute is 0, it means that the live streaming media file is a simulated live broadcast; when the value of this attribute is 1, it means that the live RTP streaming media such as a program;

The English name of the streaming media is used to identify the English name of the streaming media file or RTP streaming media. This attribute item is optional and can be expressed in characters;

Streaming media playback path, which is used to identify the streaming media playback path, such as the URL address of the Uniform Resource Locator. This attribute item is mandatory and can be expressed in characters;

The start time of a streaming media segment is only valid for streaming media files, and is a relative time relative to the streaming media file header. If this property item is set, it means to start playing from the relative time in the streaming media file; if this property item is not set, the default is to start playing from the beginning of the streaming media file. This attribute item is optional and can be represented by a long integer. The format can be year-month-day hour:minute:second (yy-mm-dd hh:mm:ss). When the attribute value of this item is "00-00-0000:00:00", it means to play immediately;

Streaming media playback duration, indicating the total duration of streaming media playback. If this property item is not set, for a streaming media file, it means playing until the end of the streaming media file; for RTP streaming media, it means playing continuously until the source RTP streaming media stops. This attribute item is optional and can be represented by a long integer.

The switching time mentioned in this step is also the start playing time carried in the switching request.

Step 304: After the streaming media server finishes switching, it sends a switching success response to the local CMS. This step can be omitted.

Step 305: the local live encoder sends the local live streaming media to the user via the local streaming media server. This step realizes the live broadcast of regional streaming media, and the specific implementation belongs to the prior art, and will not be described in detail here. It is emphasized that, according to the attribute item carried in the switching request, the local streaming media server forwards the streaming media of the specified streaming media type, specified streaming media identifier and name to the user from the playback path specified by the attribute item.

Step 306: During the regional streaming media playback, the local streaming media server monitors in real time whether the system time reaches the end playback time, and when the system time reaches the end playback time, the local streaming media server stops the local live streaming media and switches back to the central live broadcast .

In this step, assuming the streaming media playback duration attribute item carried in the switch request, the end playback time is obtained according to the streaming media start playback time and streaming media playback duration carried in the switching request, that is, the streaming media start playback time and the streaming media playback duration The sum of the media playback durations is the end playback time.

In addition, the local streaming media server can also end the local live broadcast at a fixed time according to the streaming media playback duration, that is, when the streaming media playback duration reaches, stop the local live streaming media and switch back to the central live broadcast again.

Step 307: After the streaming media server switches back to the receiving center's live streaming media, it sends a switching completion response to the local CMS. This step can be omitted.

Step 308 implements the global streaming media live broadcast, which belongs to the prior art and will not be repeated here.

The method of the present invention emphasizes that in the local streaming media system, the switch between the global streaming media live broadcast and the regional streaming media live broadcast is realized. On the basis of the business, develop the regional CMB business by itself, use the already influential live streaming channel to deliver new content in real time, realize the switching of global/regional live streaming, and ensure the timeliness of live streaming in the CMB business , so as to meet the needs of local users.

The above is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall include Within the protection scope of the present invention.

Claims (12)

1. A method for realizing streaming media switching, characterized in that the method comprises: The local streaming media server receives the switching request from the local content management system CMS to start the local live streaming media, stops receiving the live streaming media of the center, and receives and forwards the local live streaming media. 2. The method according to claim 1, characterized in that, before the local streaming media server receives the switch request, the method further comprises: the local streaming media server receiving and forwarding the live streaming media of the center. 3. The method according to claim 1, further comprising: after the local streaming media server stops receiving live streaming media from the center, sending a switching success response to the local CMS. 4. The method according to claim 1 or 3, characterized in that the method further comprises: After the local streaming media server detects that the local live streaming media playback is completed, the local streaming media server ends the local live streaming, and receives and forwards the central live streaming media. 5 . The method according to claim 4 , further comprising: after the local streaming media server receives the live streaming media from the center, sending a handover completion response to the local CMS. 5 . 6 . The method according to claim 1 , wherein the switching request includes: streaming media start time, streaming media identifier, streaming media name, streaming media type, and streaming media playing path. 7. The method according to claim 6, wherein, when the local system time reaches the playing start time, the local streaming media server stops receiving the live streaming media of the center, and receives and forwards the local live streaming media. 8 . The method according to claim 6 , wherein the switch request further includes: the English name of the streaming media, and/or the start time of the streaming media segment, and/or the playback duration of the streaming media. 9. The method according to claim 4, wherein the switch request includes streaming media start time and streaming media playback duration, and the method for detecting the completion of local live streaming media playback is: According to the streaming media start playing time and the streaming media playing duration, the end playing time is obtained, and whether the local streaming media server real-time monitors whether the system time reaches the ending playing time, and when the system time reaches the ending playing time, the local streaming media The server detects that the streaming media playback of the local live broadcast is completed; Or when the streaming media playing duration arrives, the local streaming media server detects that the local live streaming media playing is completed. 10. A streaming media server, comprising a control module and a media transmission module, is characterized in that, it is further provided with a switching module controlling global/area streaming media live switching; It is used for notifying the media delivery module to stop receiving streaming media from the central streaming media system, and to receive and forward streaming media from the local live streaming encoder when receiving a switch request from the local CMS to start the local streaming media live broadcast. 11. The streaming media server according to claim 10, characterized in that, a connection for the switching module to send a switching success response or a switching completion response to the local CMS is set between the switching module and the local CMS. 12. The streaming media server according to claim 10 or 11, characterized in that, the switching module is an independent module, or the switching module is an increase in the control module with the ability to control global/regional live streaming switching Logical function modules for functions.

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