WO2006006685A1 - コンテンツ配信システム、クライアント、サーバ、コンテンツ配信方法およびコンテンツ再生方法 - Google Patents
コンテンツ配信システム、クライアント、サーバ、コンテンツ配信方法およびコンテンツ再生方法 Download PDFInfo
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- WO2006006685A1 WO2006006685A1 PCT/JP2005/013088 JP2005013088W WO2006006685A1 WO 2006006685 A1 WO2006006685 A1 WO 2006006685A1 JP 2005013088 W JP2005013088 W JP 2005013088W WO 2006006685 A1 WO2006006685 A1 WO 2006006685A1
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- Prior art keywords
- content
- contents
- client
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2401—Monitoring of the client buffer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2668—Creating a channel for a dedicated end-user group, e.g. insertion of targeted commercials based on end-user profiles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6377—Control signals issued by the client directed to the server or network components directed to server
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages
- H04N21/8113—Monomedia components thereof involving special audio data, e.g. different tracks for different languages comprising music, e.g. song in MP3 format
Definitions
- Content distribution system client, server, content distribution method, and content reproduction method
- the present invention relates to a content self-trust system, a client, a server, a content self-trust method, and a content reproduction method for delivering content such as music and video to a client from Sano.
- a server distributes content such as music and video via a network such as a wired LAN or a wireless LAN in response to a request from a client.
- a network such as a wired LAN or a wireless LAN
- An example of this type of content distribution system is described in Non-Patent Document 1, for example.
- the user can send a request to the server through the client while in his / her room and enjoy the music provided by Sano in response to this request.
- Non-patent document 1 Hyundai Musiccast (registered trademark) catalog August 2003 Disclosure of invention
- a client can receive content distribution one song at a time, for example, as a unit of multiple songs, for example, in units of all songs recorded on one CD. It is also possible to receive content distribution.
- each song on the CD is stored in the server as a separate content.
- the server when distributing content for all CDs from Sano, the first song is distributed from Sano to the client, and the playback of the first song is completed at the client.
- the server When the server notifies the server to that effect, the server distributes the second song.For example, the server waits for the client to complete the playback of the preceding content and then distributes the subsequent content.
- the present invention has been made in view of the above circumstances, and a content distribution system, a client, and a server capable of continuously reproducing a plurality of contents without leaving a waiting time in the client It is an object to provide a content distribution method and a content reproduction method.
- the present invention provides the following content distribution system, client, server, content distribution method, and content reproduction method.
- a content S communication system comprising a server and a client connected to the server via a network
- a storage unit for storing a plurality of contents
- a transmission unit that reads the plurality of contents constituting a group and continuously transmits them to the client when receiving a distribution request for the grouped contents from the client;
- a receiving unit for receiving the plurality of contents from the server
- a buffer that sequentially stores the plurality of contents received by the receiving unit; and a playback unit that sequentially reads and reproduces the plurality of contents stored in the buffer from the previously stored content; Is provided.
- “sequentially transmitting a plurality of contents to the client” means “a server that does not wait for a notification of completion of playback from the client transmits a plurality of contents to the client”. ing.
- the transmission unit transmits the content and content attached information used by the client for the reproduction process of the content
- the playback unit plays back content using content-attached information corresponding to the content whose buffer power is also read.
- the reproduction unit performs cross-fade reproduction of a plurality of contents continuously transmitted from the servo.
- a client configured to be connected to a server via a network, and a transmission unit that transmits a request signal requesting distribution of a plurality of grouped contents to the server;
- a receiving unit that receives a plurality of contents continuously transmitted from the server; a buffer that sequentially stores the plurality of contents received by the receiving unit; and the plurality of contents stored in the buffer first.
- a playback unit that reads and plays back the stored content in order,
- a plurality of contents transmitted continuously means “a plurality of contents transmitted to the client by the server without waiting for a notification of completion of reproduction from the client”.
- reception unit receives the content and content-attached information that is used by the client for reproduction processing of the content
- the playback unit plays back content using content-attached information corresponding to the content whose buffer power is also read.
- a server configured to be connected to a client via a network, the storage unit storing a plurality of contents
- a receiving unit for receiving a request signal for requesting distribution of a plurality of grouped contents from the client;
- a transmission unit that reads the plurality of contents constituting the group from the storage unit based on the request signal and continuously transmits the content to the client;
- sending a plurality of contents continuously to the client means “a server that does not wait for a notification of completion of playback from the client sends a plurality of contents to the client”. ing.
- sending a plurality of contents continuously to the client means “a server that does not wait for a playback completion notification from the client sends a plurality of contents to the client. It means "to do”.
- the content is reproduced using the content attached information corresponding to the content to be read out by the buffer power.
- a plurality of contents continuously transmitted from Sano means “a plurality of contents transmitted to the client by the server without waiting for a notification of completion of reproduction from the client”.
- the content is reproduced using the content attached information corresponding to the content to be read out by the buffer power.
- FIG. 1 is a block diagram showing a configuration of a content distribution system according to a first embodiment of the present invention.
- FIG. 2 is a sequence diagram showing an operation of the embodiment.
- FIG. 3 is a sequence diagram showing an operation of the embodiment.
- FIG. 4 is a diagram showing crossfade reproduction performed in the second embodiment of the present invention.
- FIG. 5 is a diagram showing crossfade reproduction performed in the second embodiment of the present invention.
- 100 is a server
- 101 is a CPU
- 102 is a storage device
- 103 is a buffer
- 104 is a network interface
- 200 is a client
- 201 is a CPU
- 202 is an operation word
- 204 is a network interface
- Reference numeral 205 denotes a notch
- 206 denotes an AV output unit.
- FIG. 1 is a block diagram showing a configuration of a content distribution system according to the first embodiment of the present invention.
- a server 100 is connected to at least one client 200 via a network such as a LAN.
- the server 100 is a device that distributes content in response to a request from the client 200.
- the content of multimedia information that also has the power of stream data of video tracks and stream data of audio tracks is sent from the server 100 to the client 200.
- the server 100 includes: a CPU 101 that controls distribution of content for each client 200; a storage device 102 that stores various types of content; a buffer 103 that temporarily stores content destined for the client 200; And a network interface 104 for controlling communication between them.
- the client 200 is a device that sends a content distribution request to the server 100 in accordance with a user operation and reproduces the content distributed from the server 100 in response to the request.
- the client 200 includes a CPU 201 that performs control for receiving content instructed by the user from the server 100 and control for playing back the received content, and an operation element such as a keypad.
- display device 203 that displays various information according to instructions from CPU 201, network interface 204 that controls communication with server 100, and server via network interface 204 It has a buffer 205 that temporarily stores content received from 100, and an AV output unit 206 that reads the content in the buffer 205 and reproduces music and video.
- an individual specification method for specifying content one by one there are two methods for specifying content to be distributed: an individual specification method for specifying content one by one, and a group specification method for specifying a group consisting of a plurality of contents.
- the user can instruct the server 100 of content to be distributed according to a desired method of these two types of designation methods.
- the individual transmission mode is an operation mode that is selected when content is designated by an individual designation method.
- the server 100 delivers content one by one in response to a delivery request from the client 200.
- the continuous transmission mode is an operation mode selected when content is designated by group designation.
- the servo 100 continuously transmits a plurality of contents belonging to the group designated by the client 200.
- “the server 100 continuously transmits a plurality of contents” means “the server 100 transmits a plurality of contents to the client 200 without waiting for the notification of the completion of playback from the client 200”. is doing.
- a typical example of content designation by group designation is when a live-recorded album is designated. In this case, the songs constituting the album are stored in the storage device 102 as separate contents. However, when a distribution request specifying this album is sent from the client 200 to the server 100, the contents of each song constituting this album are continuously transmitted to the client 200.
- FIG. 2 shows a first operation example of the present embodiment when the continuous transmission mode is selected. It is a sequence diagram.
- the CPU 101 of the server 100 reads out the content attached information of the first content A in the group designated in the distribution request from the storage device 102 and sends it to the client 200 (step S102).
- This content ancillary information includes information related to pre-emphasis given to the audio track stream data in content A, titles that should be displayed on display device 203 during content A video playback on the client 200 side, etc. Contains information.
- the CPU 201 of the client 200 receives the content attachment information, the AV output unit 206 sets the de-emphasis amount setting during music playback based on the pre-emphasis information included in the content attachment information. In addition to instructing, the AV output unit 206 is instructed to display the title included in the content attached information.
- CPU 101 of server 100 which has finished transmitting the content-attached information, subsequently starts transmitting content A (step S103).
- the CPU 201 of the client 200 stores the content A data sent from the server 100 in the buffer 205.
- the CPU 201 instructs the AV output unit 206 to reproduce the content A data accumulated in the nota 205.
- the AV output unit 206 sequentially reads the power of the content A stored in the notifier 205 in advance, and reproduces it as audio and video.
- the CPU 201 monitors the remaining amount of the nota 205, that is, the amount of data that has not been reproduced, and periodically notifies the server 100 of this remaining amount (step S104).
- the CPU 101 of the server 100 controls the transmission speed of the content A sent to the client 200 based on the remaining amount of the buffer 205 notified from the client 200.
- feedback control is performed such that the transmission speed of the content A is reduced when the remaining amount of the notifier 205 exceeds a predetermined amount, and the transmission speed is increased when the remaining amount is below the predetermined amount.
- a certain remaining amount is maintained in the buffer 205. Therefore, for example, due to network congestion, the server 100 and the client Even if there is a momentary interruption in data transmission between the events 200, the data remaining in the buffer 205 during that time is supplied to the AV output unit 206, and music and video are reproduced without interruption.
- CPU 101 of server 100 finishes transmitting the last data of content A (step S105), it selects the next content B of content A in the group specified by client 200, and the content of content B The attached information is transmitted to the client 200 (step S106). Then, following the transmission of the content-attached information, the CPU 101 starts transmitting the content B to the client 200 (step S107).
- the server waits for notification of the completion of playback of content A and starts delivery of subsequent content B.
- the CPU 101 of the server 100 in the present embodiment transmits the content B following the content A without waiting for such a reproduction completion notification from the client.
- CPU 201 of client 200 When CPU 201 of client 200 receives the last data of content A, it writes it in buffer 205. When the next CPU 201 receives the content attachment information of content B, the CPU 201 stores the content attachment information in a built-in register (not shown). Then, when the reception of the content B data starts, the CPU 201 writes this data in the buffer 205 following the last data of the content A. At that time, the CPU 201 stores the address of the buffer 205 in which the first data in the content B is stored in a built-in pointer (not shown).
- the de-emphasis amount is set in the AV output unit 206 and the title display is controlled.
- CPU 201 The server 100 is notified of the end of playback of content A and the start of playback of content B (step S108).
- CPU 101 of server 100 eventually transmits the last data of content B (step S109).
- the CPU 101 notifies the client 200 that the transmission of the content B, which is the last content, has ended (step S110).
- CPU 201 of client 200 notifies server 100 of the completion of reproduction of content B (step S111). Upon receiving this notification, the CPU 101 of the server 100 ends all processing for content distribution within the group specified by the client 200.
- a plurality of contents constituting a group can be continuously played back on the client 200 side.
- FIG. 3 is a sequence diagram showing a second operation example of the present embodiment.
- a distribution request for a group having content 8, B, and C power is sent from the client 200 to the server 100 (step S201), and content A is distributed (step S202) accordingly.
- content A is distributed (step S202) accordingly.
- distribution of content B (step S203) is started.
- a change request to play content C instead of content B after content A is sent from client 200 to server 100. (Step S204).
- CPU 101 of server 100 When CPU 101 of server 100 receives this change request, it instructs client 200 to clear content B (step S205).
- the CPU 201 of the client 200 stores the content ancillary information of the content B in the built-in register when the reception of the content B is started, and the first content B in the buffer 205 is stored. The data storage address is stored in the built-in pointer.
- the CPU 201 Upon receiving the content B clear instruction, the CPU 201 clears the content ancillary information stored in the register and clears the content B data stored after the address indicated by the pointer in the nota 205. To do.
- CPU 101 of server 100 after sending an instruction to clear content B, transmits content ancillary information of content C to client 200 (step S206), and subsequently, client of content C Transmission to 200 is started (step S207).
- the CPU 201 of the client 200 receives the content-attached blueprint of the content C, the CPU 201 stores the content-attached information in a built-in register. Then, when the reception of the content C data starts, the CPU 201 writes this data in the buffer 205 following the last data of the content A. At that time, the CPU 201 stores the address of the buffer 205 in which the first data in the content C is stored in the built-in pointer. Subsequent operations are the same as those in the first operation example.
- the content C is stored in the buffer 205 after the content A, so the content C is reproduced after the content A.
- the client when a plurality of contents are continuously sent from the server to the client in the continuous transmission mode, the client is caused to perform cross-fade reproduction of the audio track stream data among the continuous contents. It is.
- a buffer 205 and a video track are separately provided as the buffer 205. Since the processing of video track data is the same as that in the first embodiment, the description thereof will be omitted, and only the processing of audio track data will be described below.
- FIG. 4 illustrates the principle of crossfade playback performed in the present embodiment.
- the stream data of the audio track constituting the content is PCM data, and pre-emphasis is performed.
- the PCM data of the audio track is de-emphasized and stored in the buffer.
- the data at the end of content A stored in the buffer 205 and the predetermined length at the beginning of content B are stored.
- Crossfade is performed with the data of the other, and the data after crossfade is stored in the buffer.
- the content A is stored at the buffer address ADRe.
- the next calculation is performed between the content B data Db that is sequentially received and the content A data Da that has already been stored in the area from the address ADRe— ⁇ to the address ADRe.
- the operation result Dx is sequentially stored in the area from address ADRe— ⁇ to address ADRe.
- r changes continuously from 0 to 1 as the write address of the calculation result Dx advances from address ADRe- ⁇ A to address A DRe.
- the last predetermined length portion of the received content A and the new predetermined length portion of the newly received content B are crossfaded, and the data after the crossfade is stored in the buffer 205. It is done.
- the received content B data is stored in the area after the address ADRe of the buffer 205 without being crossfaded.
- the AV output unit 206 sequentially reads and reproduces the stream data of the audio tracks of the contents A and B stored in the buffer in this way. At that time, when the end of the content A reaches a predetermined length, the crossfade stream data is read from the buffer and output as sound. Therefore, the music listened to by the user can be naturally shifted from the content A song to the content B song.
- the audio track stream data of the continuous contents is cross-faded and reproduced in the client. It was made to do.
- FIG. 5 illustrates the principle of crossfade playback performed in the present embodiment.
- the audio track stream data is encoded data obtained by encoding using, for example, an MP3 (MPEG 1 layer 3) encoding algorithm.
- MP3 MPEG 1 layer 3
- the first read position and the second read position separated by a predetermined address length ⁇ A across the boundary between the write area for content A and the write area for content B in the buffer are set for each stream data of contents A and B.
- the first read position and the second read position are sequentially read from the address ADRe— ⁇ A and the address ADRe, while reading the stream data of the content A and the stream data of the content B.
- the above-described equation (1) is applied to the content A data Da and the content B data Db, and the resulting data Dx is output to the AV output unit 206. Is output as sound.
- the contents when there is a distribution request for a plurality of grouped contents, the contents are continuously sent from the Sano to the client, so that these contents are not received on the client side. Played continuously.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Computer Networks & Wireless Communication (AREA)
- Human Computer Interaction (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Information Transfer Between Computers (AREA)
- Reverberation, Karaoke And Other Acoustics (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/632,114 US8589576B2 (en) | 2004-07-15 | 2005-07-14 | Contents distributing system, client, server, contents distributing method, and contents reproducing method |
EP05760133.8A EP1783619B1 (en) | 2004-07-15 | 2005-07-14 | Contents delivery system, client, server, contents delivery method and contents reproducing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004209105A JP2006031394A (ja) | 2004-07-15 | 2004-07-15 | コンテンツ配信システム |
JP2004-209105 | 2004-07-15 |
Publications (1)
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WO2006006685A1 true WO2006006685A1 (ja) | 2006-01-19 |
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Family Applications (1)
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PCT/JP2005/013088 WO2006006685A1 (ja) | 2004-07-15 | 2005-07-14 | コンテンツ配信システム、クライアント、サーバ、コンテンツ配信方法およびコンテンツ再生方法 |
Country Status (5)
Country | Link |
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US (1) | US8589576B2 (ja) |
EP (1) | EP1783619B1 (ja) |
JP (1) | JP2006031394A (ja) |
CN (1) | CN1985246A (ja) |
WO (1) | WO2006006685A1 (ja) |
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JP4345780B2 (ja) | 2006-07-14 | 2009-10-14 | ソニー株式会社 | 再生装置、再生方法およびコンピュータプログラム |
JP4371127B2 (ja) | 2006-07-14 | 2009-11-25 | ソニー株式会社 | 再生装置、再生方法、プログラム |
JP4720847B2 (ja) * | 2008-04-21 | 2011-07-13 | ソニー株式会社 | 記録システム、伝送装置、記録装置、及び記録制御方法、並びにプログラム |
JP2011009904A (ja) * | 2009-06-24 | 2011-01-13 | Hitachi Ltd | 無線映像配信システム、コンテンツビットレート制御方法及びコンテンツビットレート制御プログラムを記憶したコンピュータ読み取り可能な記録媒体 |
WO2011027435A1 (ja) * | 2009-09-02 | 2011-03-10 | 富士通株式会社 | フレーム間ギャップ制御ユニット、トラヒック送信ユニット、伝送装置及びフレーム間ギャップ制御方法 |
JP5640574B2 (ja) | 2010-09-01 | 2014-12-17 | ヤマハ株式会社 | 端末装置 |
WO2013075138A1 (en) | 2011-11-18 | 2013-05-23 | Sirius Xm Radio Inc. | Systems and methods for implementing cross-fading, interstitials and other effects downstream |
WO2013158804A1 (en) | 2012-04-17 | 2013-10-24 | Sirius Xm Radio Inc. | Systems and methods for implementing efficient cross-fading between compressed audio streams |
US20150309844A1 (en) | 2012-03-06 | 2015-10-29 | Sirius Xm Radio Inc. | Systems and Methods for Audio Attribute Mapping |
JP6095543B2 (ja) * | 2013-09-27 | 2017-03-15 | 本田技研工業株式会社 | 再生装置、再生方法、およびプログラム |
WO2018180110A1 (ja) * | 2017-03-28 | 2018-10-04 | パナソニックIpマネジメント株式会社 | コンテンツ配信システム、再生装置、及び、コンテンツ配信方法 |
CN111935695B (zh) * | 2020-07-16 | 2021-07-27 | 鸣飞伟业技术有限公司 | 一种基于应急通信单兵动中通的应用系统 |
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Also Published As
Publication number | Publication date |
---|---|
US20080195695A1 (en) | 2008-08-14 |
EP1783619A4 (en) | 2010-10-13 |
EP1783619A1 (en) | 2007-05-09 |
EP1783619B1 (en) | 2014-02-26 |
CN1985246A (zh) | 2007-06-20 |
US8589576B2 (en) | 2013-11-19 |
JP2006031394A (ja) | 2006-02-02 |
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