JP2004312560A - Streaming receiving terminal, and streaming distribution apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a streaming receiving terminal capable of realizing stable data communications even when moving between the networks of different line bands. <P>SOLUTION: The streaming receiving terminal 10 is provided with a receiving module 13 for receiving the video data and audio data transmitted from a streaming distribution apparatus 30, a frame check module 15 for counting the number of the dropped frames in the video data received by the receiving module 13, a video distribution stop judging module 16 for judging whether or not the distribution of the video data is to be stopped on the basis of the quality evaluated by the frame check module 15, and a distribution request transmitting module 12 for transmitting a distribution stop request for the video data to the streaming distribution apparatus when the video distribution stop judging module 16 judges that the distribution of the video data is to be stopped. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a streaming receiving terminal that receives multimedia data of video data and audio data in a streaming manner, and a streaming delivery device that delivers multimedia data in a streaming manner.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when viewing multimedia data such as video and audio through a network such as the Internet, streaming distribution that simultaneously plays back data while receiving the data has been known. Also, with the rapid spread of the Internet in recent years, even if a user moves to various network environments, "MobileIP", a new technology capable of maintaining the connection of the Internet session without interruption, has attracted attention.
[0003]
[Patent Document 1]
JP-A-11-275145
[0004]
[Patent Document 2]
JP-A-2002-94603
[0005]
[Problems to be solved by the invention]
However, when the streaming distribution is applied to the above-described MobileIP, the following problems may occur. That is, when a receiving terminal receiving data moves between networks of different line bands during distribution of multimedia data, QoS control at the time of network switching is not performed smoothly, and temporary stop or disturbance of video and audio is caused. May occur.
[0006]
An object of the present invention is to solve the above problems and to provide a streaming receiving terminal and a streaming distribution device that can realize stable data communication even when moving between networks having different line bands.
[0007]
[Means for Solving the Problems]
A streaming receiving terminal according to the present invention includes a receiving unit that receives video data and audio data transmitted from a streaming distribution device, a video quality evaluating unit that evaluates the quality of video data received by the receiving unit, and a video quality evaluating unit. Video distribution stop determining means for determining whether or not to stop the distribution of video data based on the quality evaluated by the video data; and determining that the video data distribution is to be stopped by the video distribution stop determining means. Transmitting means for transmitting the distribution stop request to the streaming distribution device.
[0008]
Generally, when comparing video data and audio data in multimedia streaming distribution, the transmission band required for video data distribution is much wider. For this reason, if a band fluctuation occurs between the streaming receiving terminal and the streaming distribution device during distribution of multimedia data with video such as a television, the streaming receiving terminal enters an unstable reception state for both video and audio. On the other hand, considering the needs of real users, one reason for the occurrence of a network switching event is that the user is moving. There is little need to watch video inside. However, there is certainly a need to listen to music and the like as in a headphone stereo even while moving. Focusing on this point, the inventors have invented a streaming receiving terminal capable of receiving data stably even when the network is switched. According to the streaming receiving terminal according to the present invention, the quality of the received video data is evaluated by the video quality evaluation means, and the video distribution stop determination means determines whether to stop the distribution of the video data based on the quality of the video data. I do. Then, when the distribution of the video data is to be stopped, the request is transmitted to the streaming distribution device by the transmission means, whereby the distribution of the video data is stopped and only the audio data can be received. According to the streaming receiving terminal having such a configuration, when moving to a network with a narrow line bandwidth, the distribution of video data is immediately stopped to shorten the time required for QoS control when the network is switched. can do. Further, after the network is switched, stable streaming distribution of audio data can be realized.
[0009]
In the streaming receiving terminal, the video quality evaluation unit counts the number of dropped frames within a predetermined time, and the video distribution stop determination unit determines whether the number of dropped frames counted by the video quality evaluation unit is equal to or greater than a predetermined threshold. It is further characterized in that it is determined to stop the distribution of the video data.
[0010]
As described above, it is a simple and reliable method to determine the video quality based on the number of dropped frames within a predetermined time.
[0011]
The streaming receiving terminal further stops power supply to an image processing circuit and a display device for playing back video data when the video distribution stop determination unit determines to stop video distribution. And
[0012]
By stopping the power supply to the image processing circuit for reproducing the video data and the display device when the video distribution is stopped, the battery life of the streaming receiving terminal can be extended.
[0013]
The streaming receiving terminal includes: a line bandwidth determining unit that determines a line bandwidth of a connected network; and a transfer amount of audio data received by the receiving unit after the distribution of the video data is stopped. And a QoS control unit for performing a QoS control of the streaming distribution of the audio data in cooperation with the streaming distribution device when the bandwidth is larger than the determined line bandwidth.
[0014]
If the line bandwidth of the network is smaller than the audio data transfer amount, the data reception becomes unstable even if the distribution of the video data is stopped, so the line bandwidth determination unit determines the connected line bandwidth, When the audio data transfer amount is larger than that, it is preferable to perform QoS control on the distribution of the audio data.
[0015]
The streaming receiving terminal further includes a video distribution start determination unit that determines to start distribution of the video data when the line bandwidth determined by the line bandwidth determination unit is larger than a transfer amount of the video data and the audio data. The transmission means further comprises transmitting a video data distribution start request to the streaming distribution device when the video distribution start determination means determines to start distribution of the video data.
[0016]
In a network in which the line bandwidth is larger than the combined data transfer amount of the video data and the audio data, both the video data and the audio data can be distributed by the streaming distribution device. Therefore, a distribution start request is transmitted to the streaming distribution device. Is preferred.
[0017]
A streaming distribution device according to the present invention is a device that distributes video data and audio data by streaming, and when the streaming reception terminal transmits a video data distribution stop request, distributes the video data to the streaming reception terminal. It is characterized by stopping and delivering only audio data.
[0018]
By stopping the distribution of the video data based on the request to stop the distribution of the video data transmitted from the streaming receiving terminal and distributing only the audio data, the QoS control time when switching to a network with a narrow band is reduced, It is possible to realize stable streaming distribution of audio data.
[0019]
Further, the streaming distribution device according to the present invention is a device for streaming distribution of video data and audio data, and when a streaming start request of the video data is transmitted from the streaming receiving terminal, the streaming data of the video data to the streaming receiving terminal is transmitted. It is characterized by starting distribution.
[0020]
By starting video data distribution based on the video data distribution start request transmitted from the streaming receiving terminal described above, video data and audio data can be stably distributed to the streaming receiving terminal in a network with a large line bandwidth. can do.
[0021]
The streaming distribution system according to the present invention distributes the video data and audio data to the streaming receiving terminal, and distributes the video data when a streaming data distribution stop request is transmitted from the streaming receiving terminal. And a streaming distribution device that stops and distributes only audio data.
[0022]
By stopping the distribution of the video data based on the request to stop the distribution of the video data transmitted from the streaming receiving terminal and distributing only the audio data, the QoS control time when switching to a network with a narrow band is reduced, It is possible to realize stable streaming distribution of audio data.
[0023]
The streaming distribution system according to the present invention distributes video data and audio data to the streaming receiving terminal and the video data distribution when a streaming data distribution start request is transmitted from the streaming receiving terminal. And a streaming distribution device to be started.
[0024]
By starting video data distribution based on the video data distribution start request transmitted from the streaming receiving terminal described above, video data and audio data can be stably distributed to the streaming receiving terminal in a network with a large line bandwidth. can do.
[0025]
A streaming distribution method according to the present invention is a streaming distribution method for streaming distribution of video data and audio data from a streaming distribution device to a streaming reception terminal, and further includes a video distribution method for transmitting video data and audio data from the streaming distribution device to the streaming reception terminal. 1, a video quality evaluation step in which the streaming reception terminal evaluates the quality of the video data transmitted in the transmission step, and whether to stop the distribution of the video data based on the quality evaluated in the video quality evaluation step. The streaming receiving terminal determines whether or not to stop the video data distribution in the video distribution stop determining step. A transmission stop request transmitting step of transmitting a communication stop request, and a second transmission of stopping the distribution of the video data and distributing only the audio data when the distribution stop request is transmitted in the distribution stop request transmitting step. And step.
[0026]
According to the streaming distribution method of the present invention, the quality of the received video data is evaluated in the video quality evaluation step, and it is determined whether or not to stop the distribution of the video data in the video distribution stop determination step based on the quality of the video data. I do. When the distribution of the video data is stopped, the request is transmitted to the streaming distribution device in the distribution stop request transmitting step, so that the distribution of the video data is stopped and only the audio data can be received. According to such a streaming distribution method, when moving to a network with a narrow line bandwidth, the distribution of video data is immediately stopped to shorten the time required for QoS control when the network is switched. it can. Further, after the network is switched, stable streaming distribution of audio data can be realized.
[0027]
In the streaming distribution method, in the video quality evaluation step, the number of dropped frames within a predetermined time is counted, and in the video distribution stop determination step, the number of dropped frames counted in the video quality evaluation step is equal to or more than a predetermined threshold. A further feature is that the streaming receiving terminal determines to stop the distribution of the video data.
[0028]
As described above, it is a simple and reliable method to determine the video quality based on the number of dropped frames within a predetermined time.
[0029]
In the streaming distribution method, after the distribution of the video data is stopped, the streaming reception terminal determines the line bandwidth of the connected network by the streaming reception terminal, and the transfer amount of the audio data transmitted in the second transmission step The streaming receiving terminal performs QoS control for streaming distribution of the audio data when is larger than the line bandwidth determined in the line bandwidth determining step.
[0030]
If the line bandwidth of the network is smaller than the amount of audio data transfer, data reception becomes unstable even if video data distribution is stopped, so the line bandwidth during connection is determined in the line bandwidth determination step, When the audio data transfer amount is larger than that, it is preferable to perform QoS control on the distribution of the audio data.
[0031]
In the streaming distribution method, the line bandwidth determined in the line bandwidth determination step is larger than the transfer amount of the video data and the audio data, a video distribution start determination step of determining to start the distribution of the video data, A video distribution start request transmitting step in which the streaming receiving terminal transmits a video data distribution start request to the streaming distribution device when it is determined in the video distribution start determination step that distribution of the video data is to be started, When receiving the video data distribution start request in the distribution start request transmitting step, the streaming distribution apparatus shifts to the first transmitting step and transmits the video data and the audio data to the streaming receiving terminal.
[0032]
In a network in which the line bandwidth is larger than the combined data transfer amount of the video data and the audio data, both the video data and the audio data can be distributed by the streaming distribution device. Therefore, a distribution start request is transmitted to the streaming distribution device. Is preferred.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a streaming distribution device according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.
[0034]
FIG. 1 is a block diagram illustrating a configuration of a streaming distribution system 1 according to the embodiment. A streaming distribution system (hereinafter, referred to as a “distribution system”) 1 includes a streaming distribution device (hereinafter, referred to as a “distribution device”) 30 and a streaming receiving terminal 10 (hereinafter, referred to as a “receiving terminal”) 10 connected to each other. It is configured. The receiving terminal 10 is connected by a mobile IP network that can maintain a session with the distribution device 30 even if it moves. To realize this, a home agent (HA) 40 is interposed between the distribution device 30 and the receiving terminal 10. The HA 40 has a function of transferring the packet transmitted from the distribution device 30 to the moved receiving terminal 10.
[0035]
Next, the configuration of the receiving terminal 10 will be described. The receiving terminal 10 includes a request module 11 for inputting a distribution request for multimedia data, a distribution request transmission module 12 for transmitting a distribution request to the distribution device 30 in response to a request from the request module 11 or the like, and a transmission from the distribution device 30. A receiving module 13 for receiving the received data and a reproducing module 14 for reproducing the received data are provided. Here, the request module 11 includes, for example, a button of the receiving terminal 10 that requests distribution by pressing the button. In addition, the receiving terminal 10 has a frame check module 15 having a function of detecting dropped frames of video data received by the receiving module 13, and stops video distribution based on the frequency of dropped frames detected by the frame check module 15. And a video distribution stop determination module 16 for determining whether or not this is the case. The determination result by the video distribution stop determination module 16 is input to the distribution request transmission module 12, and when the determination result of video distribution stop is input, the video data is stopped by the distribution request transmission module 12 to request only audio data. Is transmitted. In addition, the receiving terminal 10 determines whether or not to restart the distribution of the video data based on the bandwidth check module 17 that determines the bandwidth of the currently connected network and the bandwidth determined by the bandwidth check module 17. A video distribution start determination module 18 is provided, and the determination result by the video distribution start determination module 18 is input to the distribution request transmission module 12. Furthermore, a QoS control module 19 that performs QoS control of streaming distribution based on the result of the determination of the line bandwidth by the bandwidth check module 17 is provided. The receiving terminal 10 includes an image processing module 21 that performs image processing, a display module 22 that displays an image, a backlight module 23 that turns on a backlight of a display device, and an image processing / controller that controls these modules. And a display device control module 20. The receiving terminal 10 described above is realized by a mobile phone or the like having a communication function, and the above-described modules perform the above-described functions by being executed by a CPU of the mobile phone.
[0036]
Next, the configuration of the distribution device 30 will be described. The distribution device 30 includes a distribution request receiving module 31 that receives a distribution request from the receiving terminal 10, a quality determination module 32 that determines quality based on the distribution request, and a content database (“content DB”) storing the content to be distributed. 37), a content reading module 33 that reads the content from the content DB 37, a video frame module 34 that processes the read content into data for distribution, a QoS fine adjustment module 35 that adjusts the QoS, and distributes the content data. And a distribution module 36. The distribution device 30 described above is realized by a computer having a communication function, and the above-described modules perform the above-described functions by being executed by the computer.
[0037]
Next, the operation of the distribution system 1 according to the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing the operation of the distribution system 1.
[0038]
First, the receiving terminal 10 transmits a content acquisition request to the distribution device 30 (S10). For example, in the receiving terminal 10, when the user presses a button for a distribution request, the request module 11 is activated, and the distribution request transmission module 12 transmits the distribution request. Here, it is assumed that the receiving terminal 10 is connected to a network having a line bandwidth of 300 kbps. The HA 40 transfers the content acquisition request to the distribution device 30 (S12), and the distribution device 30 receives the content acquisition request transmitted from the receiving terminal 10 (S14). When receiving the content acquisition request from the receiving terminal 10 (S14), the distribution device 30 distributes the streaming data to the receiving terminal 10 (S16). The data distributed here is assumed to be multimedia data of 240 kbps for video data and 60 kbps for audio data, totaling 300 kbps. The HA 40 transfers the data transmitted from the distribution device 30 to the receiving terminal 10 (S18), and the receiving terminal 10 receives the data transmitted from the distribution device 30 (S20). The flow up to this point is a normal streaming distribution operation. When the receiving terminal 10 does not move, the streaming distribution is completed by this operation. At the stage up to now, the distributed data of 300 kbps is the amount of data that can be transmitted with the network bandwidth (300 kbps), so if the communication environment does not deteriorate for some reason, the distribution quality will not decrease. Does not happen.
[0039]
Next, it is assumed that the receiving terminal 10 moves and moves to a network having a line bandwidth of 64 kbps. When the receiving terminal 10 moves on the network, a session handover is performed between the receiving terminal 10 and the HA 40 (S22). Specifically, the binding update is transmitted from the receiving terminal 10 to the HA 40, and the HA 40 updates the binding cache, which is a pair of the home address and the moved address, based on the received binding update. As described above, the session is maintained even after the receiving terminal 10 moves between networks, and streaming data is distributed from the distribution device 30 to the receiving terminal 10 (S24, S26, S28). At this time, since the line bandwidth of the network is 64 kbps, if the data of 300 kbps is to be distributed, the distribution quality is reduced and the drop of frames occurs. The receiving terminal 10 detects the number of dropped frames within a predetermined time (S30), and determines whether to stop the distribution of the video data based on the number of dropped frames (S32). Here, when three or more frames are lost in one second and the state continues for three seconds or more, it is determined that the distribution of the video data is stopped.
[0040]
When it is determined that the distribution of the video data is to be stopped, the receiving terminal 10 transmits a video data stop request (S34). The HA 40 transfers the video data stop request to the distribution device 30 (S36), and the distribution device 30 receives the video data stop request transmitted from the receiving terminal 10 (S38). Upon receiving the video data stop request (S38), the distribution device 30 stops the distribution of the video data to the receiving terminal 10, and distributes only the audio data (S40). The HA 40 transfers the audio data to the receiving terminal 10 (S42), and the receiving terminal 10 receives the audio data (S44).
[0041]
Next, an operation of the receiving terminal 10 for realizing the above-described flow will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the receiving terminal 10.
[0042]
When receiving the streaming data (S60), the receiving terminal 10 determines whether or not the line bandwidth has decreased (S62). When the line bandwidth is reduced, the receiving terminal 10 counts the number of dropped frames of video data within a predetermined time (S64), and determines whether the number of dropped frames is equal to or greater than a predetermined threshold (S66). . In the present embodiment, the predetermined threshold is three frames per second, and it is determined whether or not a state in which three or more frames are dropped per second has continued for three seconds. The reason for the condition that dropped frames equal to or larger than the threshold value have occurred continuously for 3 seconds is to distinguish between dropped frames caused temporarily by video due to congestion and the like and dropped frames due to fluctuations in the line bandwidth. . When the number of dropped frames is equal to or greater than the threshold, the receiving terminal 10 transmits a video distribution stop request to the distribution device 30 (S68), and receives only audio data transmitted in response to the request (S70). . Next, the receiving terminal 10 compares the data transfer speed of the audio data with the line speed (S71). When it is determined that the data transfer speed of the voice data is higher than the line speed, the receiving terminal 10 notifies the distribution device 30 of a request for lowering the voice data transfer speed (S72). 10 and the distribution device 30 perform QoS control (S74). If it is determined in step S66 that the number of dropped frames is smaller than the threshold value, or if it is determined in step S71 that the voice data transfer speed is equal to or lower than the line speed, it is determined whether communication is stable in step S76. Move to
[0043]
Subsequently, the receiving terminal 10 determines whether the communication is stable enough to receive the video data (S76). In the above example, when it is determined that the communication is stable enough to receive the video data of 240 kbps in addition to the audio data of 60 kbps, the receiving terminal 10 transmits a video distribution start request to the distribution device 30. (S78) Then, the above flow is repeated. When it is determined that the communication is not stable, the above flow is repeated without transmitting the video distribution start request.
[0044]
Next, effects of the distribution device 30 according to the present embodiment will be described. According to the distribution device 30 according to the present embodiment, when the mobile terminal moves to a network with a different line bandwidth and detects a drop in frames of video data due to a decrease in the bandwidth, the receiving terminal 10 stops the video distribution. The request is transmitted to the distribution device 30, and upon receiving the request, the distribution device 30 stops the distribution of the video data to the receiving terminal 10 and distributes only the audio data. The effect of this control will be described in comparison with conventional control with reference to FIGS. FIG. 4 is a diagram comparing the control of the distribution system 1 of the present embodiment with a conventional example, and FIG. 5 is a diagram comparing using the specific example described above. As shown in FIG. 4 (a), conventionally, when switching from a wideband network to a narrowband network, QoS control is performed to maintain a ratio of video data and audio data to support a narrow line band. Was. Specifically, as shown in FIG. 5A, when 240 kbps video data and 60 kbps audio data are distributed on a 300 kbps network, the ratio of 240: 60 is almost maintained when switching to a 64 kbps network. Then, a 64 kbps line band is distributed with video data of 52 kbps and audio data of 12 kbps. In the distribution device 30 according to the present embodiment, when switching from the wideband network to the narrowband network as shown in FIG. 4B, the distribution device 30 controls the distribution, stops the distribution of the video data, and outputs only the audio data. To deliver. As shown in FIG. 5B, audio data of 60 kbps is distributed using a line bandwidth of 64 kbps. As a result, even after switching to a narrowband network, audio data can be maintained at the same quality as before the network switching. When network switching occurs, that is, when the user is moving, it is often sufficient to deliver only audio data, so it is preferable to deliver high-quality audio data with priority.
[0045]
Also, as can be seen by comparing FIG. 4A and FIG. 4B, the distribution device 30 according to the present embodiment can shorten the QoS control time at the time of network switching, thereby distributing at the time of switching. There is an effect that the stop time can be reduced. This will be described with reference to FIGS. FIG. 6 is a diagram illustrating bandwidth control when switching from a network having a line bandwidth of 10 Mbps to a network having a bandwidth of 100 kbps. As shown by the solid line in FIG. 6, the actual communication line speed drops sharply. On the other hand, in the QoS control, the line speed is reduced by a predetermined value, communication is attempted, the communication quality is detected, the QoS control is completed if the communication quality is improved, and the predetermined value is further reduced if the communication quality is not good. Step-down control is performed. Therefore, as shown in FIG. 7, a QoS control time proportional to the band gap of the network before and after the switching is required, during which the streaming distribution is stopped. On the other hand, according to the distribution device 30 according to the present embodiment, when the drop of frames of the video data occurs equal to or more than the predetermined threshold, the reception terminal 10 transmits the video distribution stop request, and the distribution device 30 transmits the video distribution stop request. Can be stopped in a simple sequence (see FIG. 2), and the distribution stop time at the time of switching can be significantly reduced.
[0046]
Further, the receiving terminal 10 according to the present embodiment adopts a configuration in which each receiving terminal 10 evaluates the quality of the video, and the receiving terminal 10 determines whether to stop the video distribution based on the result. The criterion for stopping the video can be freely set for each receiving terminal 10. Further, by providing the receiving terminal 10 with the determination criterion as described above, the receiving terminal 10 itself can make the determination, and can link to the independent application function of the receiving terminal 10. For example, since the image processing circuit chip group (LSI) and the display device (liquid crystal display, backlight system) consume relatively more power than the audio circuit and the audio processing group, it is determined that the distribution of the video data is stopped. In this case, the decoding and display processing of the image data sent from the distribution device 30 is stopped by the receiving terminal itself, and the processing is specialized to the audio processing group, so that the battery life (startup time) can be extended. In the example of the receiving terminal 10 according to the present embodiment, when the distribution of the video data is started or stopped by the video distribution stop determination module 16 and the video distribution start determination module 18, the information is transmitted to the image processing / display device control module 20. In response, the image processing / display device control module 20 can control the image processing module 21, the display module 22, and the backlight module 23. The function of stopping a part of the processing chip group by detecting the dropped frame is not limited to the two-way communication, and the above technology is applied to a portable TV and a portable telephone compatible with future terrestrial digital broadcasting, and only the sound is applied. And an effective effect of extending the battery life can be obtained.
[0047]
Next, a description will be given, with reference to FIG. 8, of processing in the case where the network is switched to a network with a line speed lower than the transfer speed of audio data in the distribution system 1 of the present embodiment. FIG. 8 is a flowchart showing the operation of the distribution system 1.
[0048]
The operation from the reception terminal 10 transmitting the video distribution stop request to the distribution device 30 until the distribution device 30 stops the video data distribution and distributes only the audio data (S44) is the same as the flow described in FIG. is there. However, in the flow described with reference to FIG. 8, it is assumed that the distribution device 30 performs streaming distribution of a total of 384 kbps of video data 304 kbps and audio data 80 kbps to the receiving terminal 10.
[0049]
After the distribution of the video data is stopped and the distribution of only the audio data is started, the receiving terminal 10 determines the line bandwidth (S46). The line bandwidth can be determined by using device information of the receiving terminal 10 that is receiving data. For example, it is possible to determine whether the connection is made by FOMA (registered trademark) or PHS depending on the device used, and the line bandwidth can be determined based on this. Here, the line bandwidth of the switched network is 64 kbps (for example, PHS). Next, the receiving terminal 10 compares the line bandwidth with the transfer speed of the audio data (S48). Here, since the transfer speed of the audio data is higher, QoS control is performed for the audio data distribution (S50). As a result, even when the transfer speed of the audio data is higher than the line bandwidth, the quality of the audio data can be prevented from deteriorating as compared with a general streaming distribution unit that transmits both the video data and the audio data. it can. Note that a method different from the above-described method using the device information may be adopted as a method of determining the line bandwidth. For example, a method of downloading a predetermined file having a known data size from the distribution device 30 to the receiving terminal 10 and calculating the line bandwidth based on the time required for the download can be adopted.
[0050]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the streaming receiving terminal which concerns on this invention, when it moves to the network with a low communication speed, it stops distribution of image data immediately, and can shorten the time required for QoS control at the time of a network switch. it can. Further, after the network is switched, stable streaming distribution of audio data can be realized.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a distribution system according to an embodiment.
FIG. 2 is a flowchart illustrating an operation of the distribution system according to the embodiment.
FIG. 3 is a flowchart illustrating an operation of the receiving terminal according to the embodiment.
FIG. 4 is a diagram comparing control of the distribution system according to the embodiment with a conventional example.
FIG. 5 is a diagram comparing the control of the distribution system according to the embodiment with a conventional example using a specific example.
FIG. 6 is a diagram illustrating control when switching from a broadband network to a narrowband network.
FIG. 7 is a diagram illustrating conventional QoS control at the time of network switching.
FIG. 8 is a flowchart illustrating an operation of the distribution system according to the embodiment.
[Explanation of symbols]
1 ... Streaming distribution system, 10 ... Streaming receiving device, 30 ... Streaming distribution device, 40 ... HA.

Claims (7)

Receiving means for receiving video data and audio data transmitted from the streaming distribution device,
Video quality evaluation means for evaluating the quality of the video data received by the receiving means,
Based on the quality evaluated by the video quality evaluation means, video distribution stop determination means to determine whether to stop the distribution of video data,
Transmission means for transmitting a video data distribution stop request to the streaming distribution device, when it is determined to stop the distribution of video data by the video distribution stop determination means,
A streaming receiving terminal comprising: The image quality evaluation means counts the number of dropped frames within a predetermined time,
The video distribution stop determination unit, when the number of dropped frames counted by the video quality evaluation unit is equal to or more than a predetermined threshold, determines to stop the distribution of video data,
The streaming receiving terminal according to claim 1, wherein: The power supply to an image processing circuit and a display device for playing back the video data is stopped when the video distribution stop determination unit determines to stop the video distribution. 3. The streaming receiving terminal according to 1 or 2. A line bandwidth determining unit for determining a line bandwidth of a connected network;
After the distribution of the video data is stopped, if the transfer amount of the audio data received by the receiving unit is larger than the line bandwidth determined by the line bandwidth determining unit, the audio data is transmitted in cooperation with the streaming distribution device. QoS control means for performing QoS control of streaming distribution of
The streaming receiving terminal according to any one of claims 1 to 3, further comprising: If the line bandwidth determined by the line bandwidth determination unit is larger than the transfer amount of the video data and audio data, further includes a video distribution start determination unit that determines to start distribution of video data,
The transmitting unit transmits a video data distribution start request to the streaming distribution device when the video distribution start determination unit determines to start distribution of the video data;
The streaming receiving terminal according to claim 4, wherein: An apparatus for streaming distribution of video data and audio data, wherein when a request to stop distribution of video data is transmitted from the streaming reception terminal according to any one of claims 1 to 5, video data to the streaming reception terminal. Streaming distribution apparatus, wherein distribution of the audio data is stopped and only audio data is distributed. An apparatus for streaming distribution of video data and audio data, wherein when a request to start distribution of video data is transmitted from the streaming reception terminal according to claim 5, distribution of the video data to the streaming reception terminal is started. A streaming distribution device characterized by the above-mentioned.

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