TWI444046B - Multimedia content rendering system and interface control point device - Google Patents

Description

Multimedia content playing system and interface control point device

The present invention relates to a multimedia content playing system and an interface control point device, and more particularly to a multimedia content playing system and interface control point device for a heterogeneous network.

In everyday life, whether in a company, school, or home, power lines are not just existing, but almost ubiquitous. Plug in the power outlets in the various rooms in the home, and transmit the data to the devices in the same circuit through the power line, thus forming a power line network. Therefore, the user does not need to re-erect the network, and can directly use the power line already existing in the home as the network, thereby eliminating the trouble of rewiring, thereby simplifying the network construction work.

In Taiwan Patent Application No. 097215048, it is proposed to combine a network camera and a power line communication technology, and an image signal captured by a network camera is transmitted to a remote monitor by a power line. Although this patent can be used to transfer the power line, the cost of rewiring can be saved, but the monitor cannot control the network camera. In addition, although this patent can be transmitted over the Internet or power line network, the prerequisite is that the monitor and the network camera must be on the same network, so the network camera on the power line network cannot share the video signal. The monitor on the internet. Therefore, how to use the existing power line network combined with the Internet to achieve communication between devices on different networks without re-arranging network lines or installing complex drivers is a problem to be solved. .

The present invention provides a multimedia content playing system, which can enable a service device or a playback device connected to a power line network to obtain an identification code from a control point device, or obtain an identification code in an automatically acquired manner, thereby controlling a point device. Automatically form a multimedia content playback system.

The present invention provides an interface control point device for a user to play multimedia content on a power line network or a heterogeneous network through an interface control point device.

The present invention provides a multimedia content playback system including a service device, a playback device, and a control point device connected to each other through a network. When the service device or the playback device logs into the network, and the control point device is already on the network The service device or the playback device sends a request to the control point device to obtain the identification code and confirms that the identification code is not used; if the service device or the playback device logs into the network, and the control point device is not on the network, the service device or The playback device queries each of the identifiers in a preset set one by one by broadcast to be used by other devices on the network. If it is found that the identification code in the preset set is not used by other devices on the network, it will not be used. The identification code is set to be used. The control point device includes a control module, and the control module allocates an identification code to the service device and the playback device according to the request, and according to the Universal Plug and Play Audio and Video (UPNP AV standard) The control service device provides a multimedia content to the playback device and controls the playback device to play the multimedia content.

In an embodiment of the present invention, the service device or the playback device sends a request to the control point device by using a temporary identification code when logging into the network; if the request is not answered within a preset time, the service device or the playback device The request is repeatedly issued; if the request has been repeatedly issued a preset number of times, the service device or the playback device determines that the control point device is not on the network.

In an embodiment of the present invention, if a response is requested, the service device or the playback device queries whether the identification code in the response has been used by other devices on the network in a broadcast manner; if the identification code is not used by other devices on the network Then, the service device or the playback device sets the identification code to be used, otherwise the service device or the playback device sends another request to the control point device to obtain another identification code.

In an embodiment of the invention, the control point device further includes an identification code recording area, and the control module selects an unused identification code from the identification code recording area in response to the request of the service device or the playback device. The control module queries the identification code and role attribute of each device of the network in a broadcast manner when logging into the network, and records the identification code of each device of the network in the identification code recording area, and each device includes the service. Device and playback device. In addition, when the service device or the playback device logs into the network, the identification code and the role attribute are announced in a broadcast manner, and the control module records the identification code of the service device or the playback device in the identification code recording area.

In an embodiment of the invention, the control point device further includes a service device storage area and a playback device storage area. The control module acquires the data format and the transmission protocol supported by the multimedia content directory and the service device provided by the service device from the service device, and stores the multimedia content directory and the data format and transmission protocol supported by the service device in the service device storage area. Similarly, the control module obtains the data format and transmission protocol supported by the playback device from the playback device, and stores the data format and transmission protocol supported by the playback device in the playback device storage area.

In an embodiment of the present invention, the control module compares the data format and the transmission protocol supported by the service device and the data format and transmission protocol supported by the playback device according to the content of the service device storage area and the playback device storage area. Compliance is made to control the playback device to play the multimedia content provided by the service device.

In an embodiment of the invention, the control point device further includes a communication module, which is responsible for network transmission between the control module and the service device and the playback device.

In an embodiment of the invention, the network is a power line network.

In an embodiment of the invention, the playback device is part of a control point device.

The present invention further provides an interface control point device that connects a first network and a second network. The interface control point device includes a first control module and a second control module, wherein the first control module assigns an identification code to a service device of the first network, and the identification code of the service device is obtained from the service device. The second control module performs addressing and exploration in place of the service device and a network control point device of the second network according to the UPnP AV standard, so that the network control point device knows the existence of the service device. In addition, the second control module receives the command of the network control point device, and calls the first control module, so that the first control module controls the service device to provide a multimedia content, wherein the command of the network control point device conforms to the UPnP AV standard. .

In an embodiment of the present invention, the second control module obtains the identification code of the service device in the second network from the network control point device according to the UPnP AV standard, and instead of the service device replies to the network control point device. Broadcasting, and when the second control module logs into the second network, the announcement broadcast is sent on the second network instead of the service device.

In an embodiment of the present invention, the interface control point device further includes a service device storage area, wherein the second control module receives the command of the network control point device and calls the first control module, so that the first control module The service device obtains the data format and the transmission protocol supported by the multimedia content directory and the service device provided by the service device, and stores the multimedia content directory and the data format and transmission protocol supported by the service device in the service device storage area. The second control module responds to the command of the network control point device to provide the multimedia content directory stored in the service device storage area and the data format and transmission protocol supported by the service device to the network control point device.

In an embodiment of the present invention, the interface control point device further includes a multimedia data temporary storage area, wherein the second control module receives the command of the network control point device and calls the first control module to enable the first control module The control service device provides the multimedia content to the first control module, the first control module has the role attribute of the playback device to receive the multimedia content, and the first control module temporarily stores the multimedia content in the multimedia data temporary storage area, the second control mode The group responds to the command of the network control point device to provide the multimedia content stored in the multimedia data temporary storage area to a playback device of the second network.

In an embodiment of the present invention, the first control module allocates an identification code to a playback device of the first network, obtains an identification code of the playback device from the playback device, and the second control module is based on the UPnP AV standard. Instead of the playback device and the network control point device for addressing and searching, the network control point device knows the existence of the playback device.

In an embodiment of the present invention, the interface control point device further includes a playback device storage area, wherein the second control module receives the command of the network control point device and calls the first control module, so that the first control module The playback device acquires the data format and transmission protocol supported by the playback device, and stores the data format and transmission protocol supported by the playback device in the playback device storage area. In addition, the second control module responds to the command of the network control point device to provide the data format and transmission protocol supported by the playback device stored in the playback device storage area to the network control point device.

In an embodiment of the present invention, the second control module receives a command of the network control point device and calls the first control module, so that the first control module controls the service device to provide multimedia content to the playback device, and The first control module controls the playback device to play the multimedia content.

In one embodiment of the invention, the playback device described above is part of an interface control point device.

In an embodiment of the present invention, the interface control point device further includes a first communication module, responsible for network transmission between the first control module and the first network; and a second communication module, responsible for the first Network transmission between the second control module and the second network.

In an embodiment of the invention, the first network is a power line network, and the second network is an Ethernet network.

Based on the above, the multimedia content playing system of the present invention can utilize the ubiquitous power line and the UPnP AV standard, so that the user can quickly establish a multimedia content playing system without rewiring or installing a complicated driver. Users can play multimedia content on a power line network or a heterogeneous network through an interface control point device. For example, a security surveillance camera is used as a server in the UPnP AV standard, and the above multimedia content playback system is used as a security monitoring system.

The above described features and advantages of the present invention will be more apparent from the following description.

Exemplary embodiments of the present invention will be described in the following, in which the same reference numerals are used to refer to the same or similar elements or steps. In addition, the following exemplary embodiments are merely illustrative, and are not intended to limit the invention.

FIG. 1 is a schematic diagram of a multimedia content playing system 100 according to an embodiment of the invention. The multimedia content playback system 100 supports the UPnP AV standard, including a server 102, a renderer 104, and a control point 106 interconnected by a network. The above network is, for example, a power line network, and the service device 102 is, for example, a security surveillance camera. In this embodiment, the description is made by taking one service device 102 and one playback device 104 as an example. However, the user can adjust the number of the service device 102 and the playback device 104 according to actual situations. Additionally, in some embodiments of the invention, the playback device 104 can be part of the control point device 106.

The control point device 106 assigns an identification code to the service device 102 and the playback device 104 of the newly registered power line network. When the service device 102 or the playback device 104 logs into the power line network, if the control point device 106 is already on the network, the service device 102 or the playback device 104 issues a request to the control point device 106 to obtain an identification code. After the service device 102 or the playback device 104 in the power line network obtains the identification code, the control point device 106 can obtain each device related information by using the identification code of each device, for example, the role attribute of the device (that is, the device is the service device 102). Or the playback device 104), the data format (such as Motion JPEG/MPEG4 compression format and resolution, etc.) or the transmission protocol, etc., and configure the connection between the service device 102 and the playback device 104 according to the different device data formats and transmission protocols. Lines, and controlling the playback device 104 in the power line network to play the multimedia content provided by the service device 102 in accordance with the UPnP AV standard. The service device 102 is, for example, a security surveillance camera, and the multimedia content is, for example, a picture, a music or an image screen, and the like.

In detail, FIG. 2 is a schematic diagram of a control point device in accordance with the embodiment of FIG. 1. Referring to FIG. 1 and FIG. 2 simultaneously, the control point device 106 includes an identification code recording area 202, a control module 204, a communication module 206, a playback device storage area 208, and a service device storage area 210. The playback device storage area 208 stores the data format and transmission protocol supported by the playback device 104 connected to the control module 204 via the network, and the multimedia content directory provided by the playback device 104. The service device storage area 210 stores the control module 204. The data format and transmission protocol supported by the service device 102 connected via the network. In addition, the communication module 206 is responsible for network transmission between the control module 204, the service device 102, and the playback device 104. If it is necessary to support other types of networks, the communication module 206 can be replaced with a corresponding communication module.

When the service device 102 logs into the power line network, the service device 102 sends an identification code request packet to request the control module 204 to assign an identification code, wherein the content of the identification code request packet sent by the service device 102 is as shown in FIG. 3A. FIG. 3A is a schematic diagram of a field of an identification code request packet according to an embodiment of the invention. The identification code request packet includes a selection field OPT, a device identification field NID, a dialog identification field XID, a source field SRC, and a destination field DEST. The selection field OPT indicates that the packet sent by the service device 102 is an identification code request packet. In the embodiment, the value filled in the device identification field NID is fixed to 0, which is the temporary identification code of the service device 102, and the dialog box. The identification field XID is used to mark the identification code request packet to distinguish the identification code request packet from other packets. For example, a value may be selected from 0 to 65535 to fill in the dialog identification field XID (in this embodiment, the value is 543), request the packet with the identification code. In addition, the source field SRC indicates the temporary identification code (0) of the service device 102, and the destination field DEST indicates the identification code (1) of the control point device 106, whereby the two fields can know that the identification code request packet is from the The logged in service device 102 is sent to the control point device 106.

After receiving the identification code request packet sent by the service device 102, the control module 204 returns an identification code supply packet to the service device 102 to provide the identification code to the service device 102. FIG. 3B is a schematic diagram of a field of an identification code supply packet according to an embodiment of the invention. Referring to FIG. 3B, similarly, the identification code supply package also includes a selection field OPT, a device identification field NID, a dialog identification field XID, a source field SRC, and a destination field DEST. The selection field OPT indicates that the packet sent by the control module 204 supplies the packet for the identification code, and the value filled in the device identification field NID is not used by the control module 204 in the identification code recording area 202. The identification code (in the present embodiment, its value is 5). The dialog identification field XID is used to indicate the identifier supply packet, and the value filled in is the same as the value in the dialog identification field XID in the identifier request packet sent by the service device 102, so that the control module 204 can distinguish And replying to the service device 102 that issued the identification code request. In addition, the source field SRC indicates the identification code of the control point device 106 (in the present embodiment, its value is fixed to 1), and the destination field DEST indicates the temporary identification code of the service device 102 that issued the identification code request (its value is 0) Thus, the two fields can be used to know that the identification code supply packet is sent from the control point device 106 to the logged-in service device 102.

In order to prevent the session identification field XID in the identifier request packet sent by other devices at the same time from having the same value, and causing the error of the identification code to be repeated, the service device 102 obtains the identification code selected by the control module 204, and then A confirmation packet is broadcast over the network to determine that the obtained identification code is not being used by other devices on the same network. If no other device responds after the broadcast confirmation packet, it indicates that the identification code obtained by the service device 102 is not used, and the service device 102 can set the obtained identification code as its identification code. The manner of broadcasting the confirmation packet may fill the destination field DEST in the confirmation packet into a preset broadcast-specific identification code (the value is 255 in this embodiment). If there is another device response after the broadcast confirmation packet indicates that the identification code obtained by the service device 102 has been used, the service device 102 again sends an identification code request packet to the control module 204 to obtain another identification code.

It should be noted that, in the embodiment, the identification code assigned by the control module 204 is 2~254, wherein the identification code 0 is reserved for the device just registered in the power line network, and the identification code 1 is reserved for the control point device 106. As used, the identification code 255 is used as the destination address when broadcasting. However, in this embodiment, the number of identification code bits is set to 8 bits in order to meet the specifications of the micro controller unit (MCU). The actual application is not limited thereto, and the user can actually use the situation. Need to set the number of bits of the identification code and the reserved identification code.

In addition, if the control module 204 does not respond within a predetermined time (for example, 1 minute), the service device 102 continues to repeatedly transmit the identification code request packet. If the number of times the service device 102 sends the identification code request packet reaches a preset number of times (for example, three times), and the control module 204 has not responded, the service device 102 determines that the control point device 106 is not on the power line network, and therefore cannot transmit the identification. The code supply packet is sent to the service device 102 to assign an identification code to the service device 102. At this time, the service device 102 inquires one by one whether each identification code in the preset available identification code set (that is, the above 2~254) is used by other devices on the same network. The service device 102 takes out the identification code one by one from the set of available identification codes, and finds the unused identification code by means of the broadcast confirmation packet, and sets the unused identification code as its own. It is to be noted that, in this embodiment, the service device 102 is used as an example for addressing the device. However, the addressing mode of the playback device 104 is the same as that of the service device 102, and details are not described herein.

In addition, when the control point device 106 logs into the power line network, the control module 204 broadcasts a discovery packet to all devices in the power line network, each of the power line networks (including the service device 102 and the playback device 104). After receiving the discovery packet, a discovery response packet is sent back to the control module 204. The discovery response packet includes an identification code and a role attribute (indicating whether the device is a service device or a playback device) of the device that replies to the packet, so that the control module 204 can grasp all devices in the power line network. The control module 204 records the device identification code in the discovery response packet in the identification code recording area 202. Thereafter, the control module 204 can further query the multimedia content directory of the service device 102 and its supported data formats and transmission protocols, and then store the above information in the corresponding service device storage area 210. The control module 204 can further query the data format and transmission protocol supported by the playback device 104, and then store the information in the corresponding playback device storage area 208.

Similarly, when the service device 102 or the playback device 104 logs into the power line network, the logged-in device broadcasts an announcement packet, which includes the identification code and role attributes of the newly logged device, and the control module 204 receives After the packet is announced, an announcement response packet is returned to the newly logged device, and the identification code of the new login device is stored in the identification code recording area 202. Thereafter, the control module 204 can further query the service device 102 and the playback device 104 as described above, and store the information obtained by the query into the corresponding service device storage area 210 or the playback device storage area 208.

The process described above is consistent with addressing and discovery in the UPnP AV standard. The control module 204 performs the UPnP AV standard that originally supports Ethernet (Ethernet) on the power line network.

In addition, the control module 204 can send a packet to the service device 102 to request a function description, and the service device 102 replies its own function description to the control module 204, so that the control module 204 can learn the function of the service device 102, and The function is recorded in the service device storage area 210. For example, if the service device 102 is a security surveillance camera, its function is to provide functions such as photographic angle conversion, zooming, brightness adjustment, hibernation, and monitoring.

When the user wants to control the security surveillance camera, the function description recorded by the service device storage area 210 can be used to know the functions that the security surveillance camera can provide, and the control module 204 can send the packet through the communication module 206 to control the security. Monitor the camera. For example, the monitoring function provided by the security surveillance camera can be used. If a preset abnormal situation occurs, such as setting a moving object, it will automatically report back to the control module 204.

When the user wants to cause the playback device 104 to play multimedia content (for example, playing a movie recorded by the security surveillance camera), the control module 204 can compare the content of the service device storage area 210 and the playback device storage area 208 according to the UPnP AV standard. Whether the data format and transmission protocol supported by the service device 102 and the data format and transmission protocol supported by the playback device 104 conform to each other. If so, the control module 204 can control the service device 102 to connect with the playback device 104, the control service device 102 transmits the user-specified multimedia content to the playback device 104, and controls the playback device 104 to play the multimedia provided by the service device 102. The content, in addition, can further adjust the playback characteristics of the playback device 104, such as volume, brightness, and the like.

4 is a schematic diagram of a heterogeneous network playing system in accordance with an embodiment of the present invention. Referring to FIG. 4, the heterogeneous network playback system 400 supports the UPnP AV standard, including the interface control point device 402, the network control point device 404, the service device 406, and the playback devices 408, 410. The interface control point device 402 is connected to a first network and a second network, the service device 406 and the playback device 408 are located on the first network, and the playback device 408 can be part of the interface control point device 402, and the network control Point device 404 and playback device 410 are located on the second network. In this embodiment, the first network is a power line network, and the second network is an Ethernet network.

The network control point device 404 is the true control point of the heterogeneous network playback system 400. The function of the interface control point device 402 is to connect the Ethernet and the power line network, so that the network control point device 404, which originally only supports the Ethernet network, can detect and control the service device 406 and the playback device 408 on the power line network. Achieve the purpose of connecting to a heterogeneous network. The service device 406 is, for example, a security surveillance camera.

In detail, the interface control point device 402 of the present embodiment can be as shown in FIG. 5, and FIG. 5 is a schematic diagram of the interface control point device according to the embodiment of FIG. Referring to FIG. 5, the interface control point device 402 includes an identification code recording area 501, a first control module 502, a second control module 504, a service device storage area 506, a playback device storage area 508, and a multimedia data temporary storage area 510. The first communication module 512 and the second communication module 514. The first control module 502 is similar to the control module 204 disclosed in FIG. 2, and can address and explore the service device 406 and the playback device 408 on the power line network according to the UPnP AV standard.

The first control module 502 allocates the identification code of the power line network to the service device 406 and the playback device 408 in the above addressing process, and obtains the identification codes of the two from the service device 406 and the playback device 408 during the above-mentioned exploration process. . The manner in which the first control module 502 assigns the identification code to the service device 406 and the playback device 408 of the first network is the same as that of the embodiment disclosed in FIG. On the other hand, the second control module 504 performs addressing and searching according to the UPnP AV standard instead of the service device 406 and the playback device 408, and the network control point device 404 of the second network, so that the network control point device 404 has The presence of the service device 406 and the playback device 408 is known.

In addition, the second control module 504 can receive the command of the network control point device 404 according to the UPnP AV standard, and call the first control module 502 to enable the first control module 502 to control the service device 408 to provide a multimedia content. The first communication module 512 is responsible for network transmission between the first control module 502 and the first network, and the second communication module 514 is responsible for network transmission between the second control module 504 and the second network. . If the interface control point device 402 needs to support other types of networks, the first communication module 512 and the second communication module 514 can be replaced with corresponding communication modules.

When the interface control point device 402 logs in to the first and second networks, the first control module 502 in the interface control point device 402 performs a discovery broadcast on the devices in the first network to obtain a service device in the first network. 406 and the identification code and character attributes of the playback device 408. On the other hand, the second control module 504 obtains the identification code and role attributes of the service device 406 and the playback device 408 from the first control module 502, and then obtains the service device 406 from the network control point device 404 according to the UPnP AV standard. The playback device 408 is in the identification code of the second network and replies to the discovery broadcast of the network control point device 404 in place of the service device 406 and the playback device 408. That is, after the second control module 504 receives the discovery packet sent by the network control point device 404, the second control module 504 is configured according to the identification code recording area 501 and the service device 406 stored in the service device storage area 506. The related information, and the related information of the playback device 408 stored in the playback device storage area 508, instead of the service device 406 and the playback device 408, reply to the search response packet to the network control point device 404, so that the network control point device 404 can Information about the service device 406 and the playback device 408 is obtained. In addition, when the second control module 504 logs into the second network, the second control module 504 sends a announcement broadcast on the second network in place of the service device 406 and the playback device 408, that is, the interface control point device 402 will replace The service device 406 and the playback device 408 broadcast an announcement packet on the second network to enable the device of the second network to know the presence of the service device 406 and the playback device 408.

In addition, the second control module 504 further receives the command of the network control point device 404 to call the first control module 502, so that the first control module 502 obtains the multimedia content directory provided by the service device 406 from the service device 406. The data format and transmission protocol supported by the service device 406 are stored in the service device storage area 506 by the multimedia content directory and the data format and transmission protocol supported by the service device. In this manner, the second control module 504 can provide the multimedia content directory stored in the service device storage area 506 and the data format and transmission protocol supported by the service device 506 to the network control point device in response to the command of the network control point device 404. 404.

Similarly, the second control module 504 also receives the command of the network control point device 404, calls the first control module 502, and causes the first control module 502 to obtain the data format and transmission protocol supported by the playback device 408, and It is stored in the playback device storage area 508, so that the second control module 504 can respond to the command of the network control point device 404, and provide the data format and transmission protocol supported by the playback device 408 stored in the playback device storage area 508 to the network. Road control point device 404. In this way, the network control point device 404 can match the playback device and the service device that match the data format and the transmission protocol through the interface control point device 402.

When the user wants to transmit the multimedia content of the service device 406 of the power line network to the playback device 410 in the Ethernet network, the user can cause the network control point device 404 to issue a command to the service device 406. After receiving the command, the second control module 504 calls the first control module 502 to enable the first control module 502 to control the service device 406 to provide the multimedia content to the first control module 502. The first control module 502 has a renderer role attribute of the UPnP AV standard to receive multimedia content. The first control module 502 temporarily stores the received multimedia content in the multimedia data temporary storage area 510. The second control module 504, in response to the command of the network control point device 404, provides the multimedia content stored in the multimedia data temporary storage area 510 to the playback device 410 of the second network, so that the playback device 410 provides the playback device 406. Multimedia content.

In addition, if the user wants to transmit the multimedia content of the service device 406 to the playback device 408 in the power line network, the user can cause the network control point device 404 to issue commands to the service device 406 and the playback device 408, the second control mode. After receiving the command, the group 504 calls the first control module 502 to cause the first control module 502 to control the service device 406 to provide multimedia content to the playback device 408, and causes the first control module 502 to control the playback device 408 to play the service device 406. The multimedia content provided.

In summary, the multimedia content playing system of the present invention can utilize the off-the-shelf power line network and the simple UPnP AV standard, so that the user can build a multimedia content playing system without rewiring or installing a complicated driver. The interface control point device can play a role of facilitating communication between heterogeneous networks, so that devices on different heterogeneous networks can transmit and play multimedia content.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100. . . Multimedia content playback system

102, 406. . . Service device

104, 408, 410. . . Playback device

106. . . Control point device

202, 501. . . Identification code recording area

204. . . Control module

206. . . Communication module

208, 508. . . Playback device storage area

210, 506. . . Service device storage area

400. . . Heterogeneous network playback system

402. . . Interface control point device

404. . . Network control point device

502. . . First control module

504. . . Second control module

510. . . Multimedia data temporary storage area

512. . . First communication module

514. . . Second communication module

SRC. . . Source field

DEST. . . Destination field

OPT. . . Select field

NID. . . Device identification field

XID. . . Conversation identification field

FIG. 1 is a schematic diagram of a multimedia content playing system according to an embodiment of the invention.

2 is a schematic diagram of a control point device in accordance with the embodiment of FIG. 1.

FIG. 3A is a schematic diagram of a field of an identification code request packet according to an embodiment of the invention.

FIG. 3B is a schematic diagram of a field of an identification code supply packet according to an embodiment of the invention.

4 is a schematic diagram of a heterogeneous network playing system in accordance with an embodiment of the present invention.

FIG. 5 is a schematic diagram of an interface control point device in accordance with the embodiment of FIG. 4. FIG.

106. . . Control point device

202. . . Identification code recording area

204. . . Control module

206. . . Communication module

208. . . Playback device storage area

210. . . Service device storage area

Claims (17)

A multimedia content playing system includes a service device, a playback device, and a control point device connected to each other through a network, wherein if the service device or the playback device logs into the network, the control point device is already in the On the network, the service device or the playback device sends a request to the control point device to obtain an identification code and confirm that the identification code is not used; if the service device or the playback device logs into the network, If the control point device is not on the network, the service device or the playback device queries each of the identification codes in the preset set one by one in a broadcast manner, and if the identification is found in the preset set, The code is not used by other devices of the network, and the unused identification code is used. The control point device includes a control module, and the control module assigns an identification code to the service device according to the request. The playback device, and according to the UPnP AV standard, controls the service device to provide a multimedia content to the playback device, and controls the playback device to play the multimedia Content, wherein the playback device is part of the control point device. The multimedia content playing system of claim 1, wherein the service device or the playing device sends the request to the control point device using a temporary identification code when logging in to the network; if the request is in a preset If there is no response within the time, the service device or the playback device repeatedly issues the request; if the request has been repeatedly sent a preset number of times, the service device or the playback device determines that the control point device is not on the network. The multimedia content playback system as described in item 2 of the patent application scope If the request is answered, the service device or the playback device broadcasts whether the identification code in the response has been used by other devices of the network; if the identification code is not used by other devices of the network If used, the service device or the playback device sets the identification code to be used. Otherwise, the service device or the playback device sends another request to the control point device to obtain another identification code. The multimedia content playing system of claim 1, wherein the control point device further comprises an identification code recording area, and the control module selects an unused identification code from the identification code recording area to respond to the service. The request of the device or the playback device; the control module audibly queries the identification code and role attribute of each device of the network when logging in to the network, and records the identification code of each device of the network. In the identification code recording area, each of the foregoing devices includes the service device and the playback device; when the service device or the playback device logs into the network, the identification code and the character attribute are broadcasted in a broadcast manner, and the control module The service device or the identification code of the playback device is recorded in the identification code recording area. The multimedia content playing system of claim 4, wherein the control point device further comprises a service device storage area and a playback device storage area; the control module obtains the multimedia provided by the service device from the service device a content directory and a data format and a transmission protocol supported by the service device, and storing the multimedia content directory and a data format and a transmission protocol supported by the service device in the service device storage area; the control module is obtained from the playback device The data format and transmission protocol supported by the playback device, and the data format and transmission protocol supported by the playback device are stored Enter the playback device storage area. The multimedia content playing system of claim 5, wherein the control module compares the content of the service device storage area and the playing device storage area with a data format and a transmission protocol supported by the service device, and Whether the data format and the transmission protocol supported by the playback device are consistent to control the playback device to play the multimedia content provided by the service device. The multimedia content playing system of claim 1, wherein the control point device further comprises a communication module, wherein the communication module is responsible for network transmission between the control module and the service device and the playback device. . The multimedia content playing system of claim 1, wherein the network is a power line network. An interface control point device is connected to a first network and a second network, and includes a first control module and a second control module, wherein the first control module allocates an identification code to the first network a service device that obtains an identification code of the service device from the service device, and the second control module performs addressing and exploration in place of the service device and a network control point device of the second network according to the UPnP AV standard. Having the network control point device know the existence of the service device, the first control module further assigns an identification code to a playback device of the first network, and obtains an identification code of the playback device from the playback device, and the The playback device is part of the interface control point device; the second control module receives the command of the network control point device, calls the first control module, and causes the first control module to control the service device to provide A multimedia content in which the command conforms to the UPnP AV standard. The interface control point device of claim 9, wherein the second control module obtains an identification code of the service device in the second network from the network control point device according to the UPnP AV standard, instead of The service device replies to the discovery broadcast of the network control point device, and when the second control module logs in to the second network, sends a announcement broadcast on the second network instead of the service device. The interface control point device of claim 9, further comprising a service device storage area, wherein the second control module receives the command of the network control point device, and calls the first control module to enable the The first control module obtains, from the service device, the multimedia content directory provided by the service device and the data format and transmission protocol supported by the service device, and the multimedia content directory and the data format and transmission protocol supported by the service device Deposited in the service device storage area, the second control module responds to the command of the network control point device, provides the multimedia content directory stored in the service device storage area, and the data format and transmission agreement supported by the service device To the network control point device. The interface control point device of claim 9, further comprising a multimedia data temporary storage area, wherein the second control module receives the command of the network control point device, and calls the first control module to enable The first control module controls the service device to provide the multimedia content to the first control module, the first control module has a role attribute of the playback device to receive the multimedia content, and the first control module uses the multimedia content Temporarily stored in the multimedia data temporary storage area, the second control module is returned to the network control point device The command provides the multimedia content stored in the multimedia data storage area to a playback device of the second network. The interface control point device of claim 9, wherein the second control module performs addressing and searching in place of the playback device and the network control point device according to the UPnP AV standard, so that the network control point device The existence of the playback device is known. The interface control point device of claim 13, further comprising a playback device storage area, wherein the second control module receives the command of the network control point device, and calls the first control module to enable the The first control module acquires a data format and a transmission protocol supported by the playback device from the playback device, and stores the data format and transmission protocol supported by the playback device in the playback device storage area, and the second control module returns The command of the network control point device should be provided to the network control point device for the data format and transmission protocol supported by the playback device stored in the playback device storage area. The interface control point device of claim 13, wherein the second control module receives the command of the network control point device, calls the first control module, and causes the first control module to control the service. The device provides the multimedia content to the playback device, and causes the first control module to control the playback device to play the multimedia content. The interface control point device of claim 9, further comprising: a first communication module, responsible for network transmission between the first control module and the first network; A second communication module is responsible for network transmission between the second control module and the second network. The interface control point device of claim 9, wherein the first network is a power line network and the second network is an Ethernet network.