WO2012094992A1 - Procédé et système de réalisation d'acquisition de données - Google Patents

Procédé et système de réalisation d'acquisition de données Download PDF

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Publication number
WO2012094992A1
WO2012094992A1 PCT/CN2012/070198 CN2012070198W WO2012094992A1 WO 2012094992 A1 WO2012094992 A1 WO 2012094992A1 CN 2012070198 W CN2012070198 W CN 2012070198W WO 2012094992 A1 WO2012094992 A1 WO 2012094992A1
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WO
WIPO (PCT)
Prior art keywords
rap
information
index information
segment
index
Prior art date
Application number
PCT/CN2012/070198
Other languages
English (en)
Chinese (zh)
Inventor
赵宇
王芳
孙健
陈翼
李加周
阮亚平
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of WO2012094992A1 publication Critical patent/WO2012094992A1/fr

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Classifications

    • 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
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • 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
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
    • H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
    • 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
    • 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
    • H04L65/613—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for the control of the source by the destination
    • 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
    • H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
    • H04N21/26258—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists for generating a list of items to be played back in a given order, e.g. playlist, or scheduling item distribution according to such list
    • 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
    • H04N21/47217—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 controlling playback functions for recorded or on-demand content, e.g. using progress bars, mode or play-point indicators or bookmarks
    • 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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • 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 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server
    • H04N21/6587—Control parameters, e.g. trick play commands, viewpoint selection
    • 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
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8455—Structuring of content, e.g. decomposing content into time segments involving pointers to the content, e.g. pointers to the I-frames of the video stream
    • 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
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for implementing data acquisition. Background technique
  • the HTTP protocol is essentially a text transfer protocol, it is not suitable for real-time streaming media delivery.
  • the program content is usually physically or logically divided into many small segments, as shown in Figure 1.
  • the client downloads one or more segments of the media file each time according to a Media Presentation Description (MPD) containing information such as a media segment, and then decodes the downloaded data.
  • MPD Media Presentation Description
  • the usual method is to download the corresponding segment according to the MPD, and then find the corresponding random access point (RAP) in the segment file to play, so that non-RAP data will also be played. It is downloaded, so the client will download a lot of redundant data, which seriously affects the smoothness of playback and excessively consumes network bandwidth.
  • the main object of the present invention is to provide a method and system for implementing data acquisition to reduce data downloaded during trick mode or file switching, and to improve the smoothness of playback.
  • a method for realizing data acquisition which is used for identifying a segment of a transport stream TS code stream
  • the index information of the media segmentation information further includes: acquiring, according to the media segmentation information included in the index information, a frame at a random access point RAP that needs to be played during a trick mode or file switching.
  • the method for setting the index information is: adding an index for identifying the media segment information in a segment of each TS code stream;
  • the index information includes at least the following indications: whether the RAP identifier or the RAP number is included; when there is a RAP, the information includes an offset address for identifying each RAP point, and a identifier for identifying each RAP. length.
  • the index information further includes at least one of the following:
  • RAP type used to identify the type of the corresponding segmentation RAP
  • RAP timestamp information which is used to identify the play time corresponding to each RAP
  • the program identification PID of the code stream carrying the RAP is the program identification PID of the code stream carrying the RAP.
  • the process of acquiring the frame at the RAP according to the media segment information included in the index information includes:
  • the offset and length of the RAP to be acquired are parsed from the media segmentation information, and the frame at the RAP is requested to be downloaded accordingly.
  • the trick mode includes at least one of the following:
  • a system for implementing data acquisition comprising an index information maintenance unit and a data acquisition execution unit;
  • the index information maintenance unit is configured to set index information for identifying media segment information in a segment of the TS code stream, and notify the data acquisition execution unit of the index;
  • the data acquisition execution unit is configured to: according to the media segmentation information included in the index information Information, the frame at the RAP that needs to be played when the trick mode or file is switched.
  • the index information maintenance unit is configured to: add an index for identifying the media segment information in a segment of each TS code stream when the index information is set;
  • the index information includes at least the following indications: whether the RAP identifier or the RAP number is included; when there is a RAP, the information includes an offset address for identifying each RAP point, and a identifier for identifying each RAP. length.
  • the index information further includes at least one of the following:
  • RAP type used to identify the type of the corresponding segmentation RAP
  • RAP timestamp information which is used to identify the play time corresponding to each RAP
  • the PID of the code stream carrying the RAP The PID of the code stream carrying the RAP.
  • the data acquisition and execution unit acquires the frame at the RAP according to the media segmentation information included in the index information, and is used to:
  • the offset and length of the RAP to be acquired are parsed from the media segmentation information, and the frame at the RAP is requested to be downloaded accordingly.
  • the trick mode includes at least one of the following:
  • the method and system of the invention realizes the technology of data acquisition, and the client can quickly locate the start and end positions of the RAP to be played during fast forward/rewind and media stream switching, and only download the corresponding frame for playing, and can Smoothly switch to playback mode such as normal play or time shift; thus it can effectively reduce the data downloaded during trick mode or file switching, significantly improve the smoothness of playback, and significantly improve user satisfaction.
  • 1 is a schematic structural diagram of a prior art MPEG2-TS logical segment
  • 1 is a schematic structural diagram of an MPEG2-TS logical segment and a RAP index segment according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of generating a RAP information segment according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of implementing fast forward and normal playback according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of implementing time shift positioning playback according to an embodiment of the present invention.
  • FIG. 7 is a schematic flowchart of implementing data acquisition according to an embodiment of the present invention.
  • FIG. 8 is a system diagram of implementing data acquisition according to an embodiment of the present invention. detailed description
  • the client wants to quickly locate the RAP start and end positions that need to be played during fast forward/rewind and media stream switching, and only download the corresponding The frame is played for playback, and can also be smoothly switched to a play mode such as normal play or time shift.
  • FIG. 3 is a schematic diagram of RAP information segmentation, and the RAP information included in the index is as follows:
  • the total length of the RAP index information including this field. This field can be used to discard RAP index data on normal demand. This information is optional.
  • RAP type This element identifies the type of the corresponding segmentation RAP; this information is optional.
  • Program Identification PID: The PID of the code stream carrying the RAP.
  • Offset address of RAP Identifies the offset address of each RAP point; this information is optional. This field must exist when there is a RAP; otherwise, the field does not exist.
  • Length of RAP Identifies the length of the keyframe at each RAP point; this information is optional. This field must exist when there is a RAP; otherwise, the field does not exist.
  • RAP timestamp information identifies the playback time corresponding to each RAP; this information is optional. It should be noted that, in addition to the mandatory content, the RAP information may include at least one of the above contents.
  • step A includes:
  • the client receives the trick command (such as: fast forward / rewind);
  • A2 determine the next RAP address (such as URL);
  • the client determines the segment where the next RAP is located according to the current play time and the fast forward/reverse command, and obtains the index information from the segment and forms the address of the frame at the RAP, including the basic unified resource location of the URL and the segment.
  • the client downloads the corresponding RAP frame and decodes the display.
  • step B includes:
  • the fast forward/rewind multiple is changed to 1 times and then the corresponding fast forward/rewind operation is performed until the downloaded RAP is an instant update access point (IDR);
  • IDR instant update access point
  • the client requests to download all the data of the TS segment after the RAP, and then changes to normal play after downloading.
  • step C includes: CI, finding a corresponding TS segment according to a time shift on-demand time point;
  • the client requests to download all the data of the TS segment after the RAP, and then changes to normal play after downloading.
  • step D includes:
  • D1 The network bandwidth changes, the client or the system detects the change, and determines to perform media stream switching (for example, switching from a media file having a different resolution and the like to a media file 2);
  • the client determines the switching location according to the current playing time and the segmentation information (such as the corresponding segmentation of the media file 2, time information, and RAP information);
  • the client requests the media segment at the switching location (such as the segmentation of media file 2), decodes and displays the data frame, and implements media adaptive switching.
  • the media segment such as the segmentation of media file 2
  • decodes and displays the data frame and implements media adaptive switching.
  • the embodiment of the present invention adopts MPEG2-TS as the media file storage format on the streaming media server, and performs logical segmentation on it. Add a RAP message for the segment in front of the MPEG2-TS logical segment. In order to quickly find the corresponding RAP during fast forward/rewind, positioning playback, etc., to improve the processing power of the server.
  • the first field of the RAP index information is the total length of the RAP index. According to this length, the client can easily discard the RAP index information.
  • the exchange process between the server and the client changes. As shown in Figure 4, after using the present invention, Accelerate the search for RAP.
  • the process shown in Figure 4 includes the following steps:
  • Step 401 fast forward begins.
  • Step 402 Determine whether the fast forward is over. If it is over, it jumps to step 410; otherwise, it jumps to step 403.
  • Step 403 Determine the segment where the next RAP is located according to the current playing time and the fast forward multiple.
  • Step 404 Determine whether the RAP index information corresponding to the segment has been downloaded. If yes, go to step 406; otherwise, go to step 405.
  • Step 405 Find location information of the TS segment in the MPD. Download the first 1024 bytes of the segment.
  • the RAP index information is at the beginning of the TS segment, and since the RAP index information is small, 1024 bytes are large enough, so there is no need to record the offset and size in the MPD for the RAP information.
  • Step 406 The client parses the downloaded RAP index information (that is, the media segment information included in the index information, the same applies hereinafter).
  • Step 407 Obtain an offset and a length of the RAP.
  • Step 408 The client requests the server to download the frame at the RAP.
  • Step 409 the client processes the frame at the downloaded RAP, and then jumps to step 402. Step 410, ending.
  • the media segment information included in the index information can be downloaded and parsed, and the offset and length of the RAP to be acquired are parsed from the media segment information, and the request is requested accordingly. Download the frame at the RAP.
  • Step 501 Fast forward to normal playback starts.
  • Step 502 Obtain the last RAP of the fast forward.
  • Step 503 Determine whether the RAP is an IDR. If yes, jump to 507; otherwise, Go to step 504.
  • step 504 the fast forward operation is performed by changing the fast forward multiple to 1 time.
  • Step 505 fast forward operation.
  • Step 506 acquire the next RAP, and jump to 503.
  • Step 507 Obtain an offset and a length of the RAP from the RAP information segment.
  • Step 508 The client requests to download data of all the TS segments subsequent to the RAP.
  • step 509 the next segment is switched to the normal playback process.
  • Step 510 the end.
  • Step 601 Obtain the time of the time shift positioning play.
  • Step 602 Determine whether the acquired time is Coordinated Universal Time (UTC), if yes, go to step 604; otherwise, go to step 603.
  • UTC Coordinated Universal Time
  • Step 603 Convert the time-shifted playback time to the UTC time.
  • Step 604 Obtain a start UTC of the TS file from the MPD.
  • Step 605 Calculate the presentation time of the on-demand time point.
  • Step 606 Traverse the initial presentation time of each segment recorded in the MPD, and calculate the segment where the playback point is located.
  • Step 607 Obtain the location information of the segment from the MPD, and download the first 1024 bytes. Since the RAP index information is at the beginning of the TS segment, and since the RAP index information is small, 1024 bytes are already large enough, so there is no need to record the offset and size in the MPD for the RAP information.
  • Step 608 traversing the RAP index information, and then finding a RAP whose RAP type is IDR and the PTS is greater than or equal to the presentation time of the on-demand time point.
  • Step 609 Construct a URL of all the data of the segment after the RAP according to the offset and size of the RAP and the URL of the TS segment, and request a download from the server.
  • step 610 the next segment is switched to the normal playback process.
  • the operation of the present invention for implementing data acquisition may represent a process as shown in FIG. 7, and the process includes the following steps:
  • Step 710 Set index information for identifying media segmentation information in the segment of the TS code stream.
  • FIG. 8 is a system diagram for implementing data acquisition according to an embodiment of the present invention, where the system includes a connected index information maintenance unit and a data acquisition execution unit.
  • the index information maintenance unit can set index information for identifying the media segmentation information in the segment of the TS code stream, and notify the data acquisition execution unit of the index;
  • the media segmentation information included in the index information is used to obtain a frame at the RAP that needs to be played during the trick mode or file switching.
  • the present invention realizes the data acquisition technology, and the client can quickly locate the RAP start and end positions that need to be played during fast forward/rewind and media stream switching, and only download.
  • the corresponding frame is played, and can be smoothly switched to a play mode such as normal play or time shift; thus, data downloaded during trick mode or file switching can be effectively reduced, the smoothness of playback is significantly improved, and user satisfaction can be significantly improved.
  • the present invention provides a method and system for implementing data acquisition, which may include index information for identifying media segmentation information in a segment of a TS code stream, and may also include media included in the index information. Segmentation information, the frame at the RAP that needs to be played when the trick mode or file is switched.
  • the method and system of the invention realizes the technology of data acquisition, and the client can quickly locate the start and end positions of the RAP to be played during fast forward/rewind and media stream switching, and only download the corresponding frame for playing, and can Smoothly switch to playback mode such as normal play or time shift; thus it can effectively reduce the data downloaded during trick mode or file switching, significantly improve the smoothness of playback, and significantly improve user satisfaction.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

L'invention porte sur un procédé et un système pour réaliser une acquisition de données, qui peuvent tous les deux inclure, dans les segments d'un flux de codes TS, des informations d'index servant à identifier des informations de segment multimédia et peuvent également acquérir des images au niveau du RAP à lire dans un mode cascade ou durant une commutation de fichier conformément aux informations de segment multimédia incluses dans les informations d'index. Une technologie d'acquisition de données peut être réalisée au moyen du procédé et du système de la présente invention, dans laquelle, durant une avance rapide/un recul rapide ou une commutation de flux multimédia au niveau du client, les positions de démarrage et d'arrêt du RAP à lire peuvent être rapidement localisées, et seules des images correspondantes seront téléchargées pour être lues, en outre, il est également possible de basculer vers des modes de lecture, tels qu'une lecture normale ou un décalage temporel, et ainsi de suite sans coupure; ainsi, des données téléchargées dans le mode cascade ou durant une commutation de fichier peuvent être efficacement réduites, et la continuité de lecture et la satisfaction de l'utilisateur peuvent être sensiblement améliorées.
PCT/CN2012/070198 2011-01-10 2012-01-10 Procédé et système de réalisation d'acquisition de données WO2012094992A1 (fr)

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CN201110004181.1 2011-01-10
CN201110004181.1A CN102594773B (zh) 2011-01-10 2011-01-10 一种实现数据获取的方法和系统

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CN102594773B (zh) 2017-03-29

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