WO2011088769A1 - 视频分辨率的切换方法及装置、终端及切换系统 - Google Patents

视频分辨率的切换方法及装置、终端及切换系统 Download PDF

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Publication number
WO2011088769A1
WO2011088769A1 PCT/CN2011/070226 CN2011070226W WO2011088769A1 WO 2011088769 A1 WO2011088769 A1 WO 2011088769A1 CN 2011070226 W CN2011070226 W CN 2011070226W WO 2011088769 A1 WO2011088769 A1 WO 2011088769A1
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WIPO (PCT)
Prior art keywords
video
resolution
bandwidth
frame rate
initial
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PCT/CN2011/070226
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English (en)
French (fr)
Inventor
谷沉沉
吕静
罗学成
李沛昭
王朴
Original Assignee
腾讯科技（深圳）有限公司
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Application filed by 腾讯科技（深圳）有限公司 filed Critical 腾讯科技（深圳）有限公司
Priority to BR112012017954-3A priority Critical patent/BR112012017954B1/pt
Publication of WO2011088769A1 publication Critical patent/WO2011088769A1/zh
Priority to US13/547,752 priority patent/US8730298B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • 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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H04N21/440263—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the spatial resolution, e.g. for displaying on a connected PDA
    • 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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H04N21/440281—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
    • 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
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • 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
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/4424—Monitoring of the internal components or processes of the client device, e.g. CPU or memory load, processing speed, timer, counter or percentage of the hard disk space used
    • 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
    • H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
    • H04N21/4788—Supplemental services, e.g. displaying phone caller identification, shopping application communicating with other users, e.g. chatting

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a video resolution switching method and device, a terminal, and a switching system. Background of the invention
  • network video communication has been more and more widely used.
  • the video parties establish a network connection, and one or both of the cameras activate the camera to capture the video stream, and send the captured video stream to the other party through the established network connection, and the party that receives the video stream presents the video to the other party. user.
  • Embodiments of the present invention provide a method and apparatus for switching video resolution, a terminal, and a switching system, which implement resolution switching in video communication.
  • An embodiment of the present invention provides a method for switching a video resolution, including:
  • a video communication end establishes a video communication connection with the video receiving end, and obtains an initial video resolution of the video sending end; Determining a bandwidth of the video communication connection and a hardware of the video transmitting end comply with a preset condition, and switching an initial resolution of the video transmitting end to a target resolution, where the target resolution is higher than the initial resolution.
  • an embodiment of the present invention provides a video resolution switching apparatus, including: an acquiring unit, configured to determine that a video transmitting end establishes a video communication connection with a video receiving end, and obtains a video initial resolution of the video sending end;
  • a switching unit configured to determine a bandwidth of the video communication connection, and a hardware of the video sending end meets a preset condition, and switch an initial resolution of the video sending end to a target resolution, where a target resolution of the video sending end is higher than a target resolution The initial resolution.
  • Embodiments of the present invention also provide a terminal, including the above video resolution switching device.
  • An embodiment of the present invention further provides a video resolution switching system, including multiple terminals, for implementing video communication between multiple terminals.
  • FIG. 1 is a flowchart of a method for switching video resolution according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a video resolution switching apparatus according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a video resolution switching apparatus according to another embodiment of the present invention
  • 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a video resolution switching system according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of application of a video resolution switching method according to an embodiment of the present invention. Mode for carrying out the invention
  • Embodiments of the present invention propose a method of switching video resolution, such as switching video resolution from 320*240 resolution to 640*480 resolution to provide clearer video communication for users supporting larger resolutions.
  • FIG. 1 is a flowchart of a method for switching video resolution according to an embodiment of the present invention. As shown in FIG. 1, the switching method includes:
  • the above steps 11 and 12 can be performed by the transmitting terminal or by a switching device.
  • the resolution of the terminal can be switched under the condition that the bandwidth of the video communication connection and the terminal hardware allow.
  • the initial resolution of the video sender is lower than the target resolution.
  • the target resolution H is not 640*480 resolution.
  • the target resolution of 640*480 provides clearer video communication for end users.
  • determining the bandwidth of the video communication connection and the hardware of the video sending end meet the preset conditions which may include:
  • the bandwidth of the video communication connection is greater than or equal to a bandwidth preset value, and the bandwidth preset value is set according to the size of the target resolution.
  • the CPU main frequency of the video transmitting end is greater than or equal to a preset frequency value, and the main frequency preset value is set according to the target scoring rate.
  • the specific sequence is not limited.
  • the target resolution is higher than the resolution of the video transmitting end after the video transmitting end and the video receiving end establish a video communication connection
  • the video stream of 640*480 resolution is equivalent to more than three times of the 320*240 resolution video stream, so in order to ensure The video transmitting end can transmit video data to the video receiving end, and the bandwidth of the video communication connection needs to be greater than or equal to the bandwidth preset value.
  • the video transmitting end transmits the video stream of 640*480 resolution
  • the CPU of the video transmitting end consumes a large amount of CPU, so it is necessary to determine whether the CPU's main frequency can withstand such a large consumption, for example, determining whether the CPU main frequency of the video transmitting end is greater than or equal to Or equal to the preset frequency.
  • step 12 it is determined that the bandwidth of the video communication connection and the hardware of the video sending end meet the preset condition, and may further include:
  • Determining the frame rate of the video transmitting end at the initial resolution and the corresponding network packet loss rate according to a preset condition for example: determining whether the frame rate at the initial resolution reaches the frame rate preset value and whether the corresponding network packet loss rate is Less than or equal to the network packet loss rate preset.
  • the bandwidth of the network does not necessarily represent the available bandwidth of the network in actual network applications, it is required to increase the frame rate at the target resolution to achieve the frame rate at the target resolution.
  • Bandwidth determines whether the frame rate at the initial resolution reaches the frame rate preset value, and determines whether the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value. When it is determined that the frame rate at the initial resolution reaches the preset value of the frame rate, and the corresponding network packet loss rate is less than or equal to the preset value of the network packet loss rate, the network bandwidth can be considered to meet the requirement, and the initial resolution of the video transmitting end is determined. Switch to the target resolution.
  • video bandwidth video resolution * video frame rate
  • the video bandwidth required to achieve a low frame rate of 640 * 480 resolution by increasing the high frame rate at 320 * 240 resolution.
  • the video bandwidth is not allowed, the video data packet loss will be severe, and the frame rate of the 320*240 resolution is increased, and the network is detected for packet loss.
  • the frame rate is greater than or equal to the frame rate preset value at 320*240 resolution, and the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value, the video bandwidth meets the frame rate at 640*480 resolution. .
  • the video transmitting end can start the camera to capture the video stream and output the video stream to the video receiving end.
  • the resolution of the captured video stream is the initial resolution
  • the video stream is The encoding output is performed, and the resolution of the output video stream is also the initial resolution, which will not be described here.
  • the initial resolution of the captured video at the video transmitting end can be switched to the target resolution, thereby converting the output resolution of the video transmitting end to the target resolution, and providing the terminal user with Clearer video communication.
  • the method for switching the video resolution of the embodiment of the present invention after determining the step 11 of establishing a video communication connection between the video transmitting end and the video receiving end, and simultaneously outputting the video stream with the video sending end, performing the determining the bandwidth of the video communication connection in step 12 and The hardware of the video sender meets the preset conditions and switches the resolution of the video sender to the target resolution.
  • the user's video communication realizes a smooth transition, that is, the video communication interruption or the video communication quality caused by the bandwidth not allowed or the hardware is not supported after switching to the target resolution is avoided. decline.
  • the method for switching the video resolution in the embodiment of the present invention may be: after determining the step 11 of establishing a video communication connection between the video sending end and the video receiving end, waiting to determine the bandwidth of the video communication connection and the hardware of the video transmitting end meets the preset condition. After the execution is completed, the video sending end outputs the video of the target resolution to the video receiving end. Although there will be a certain waiting time, the impact on the user experience of video communication is small due to the small waiting time.
  • the video transmitting end can be understood as a video transmitting end device.
  • the video receiving end can be understood as a video receiving end device.
  • the video receiving end corresponding to the video sending end can also be used as the video sending end, and the video resolution switching method of the embodiment of the present invention is also applicable. In this way, both sides of the video communication realize the switching of the video resolution by the method of switching the video resolution in the embodiment of the present invention, thereby providing the terminal user with clearer video communication.
  • an embodiment of the present invention provides a video resolution switching apparatus, including: an acquiring unit 21, configured to determine that a video transmitting end establishes a video communication connection with a video receiving end, and obtains a video initial resolution of a video transmitting end.
  • the switching unit 22 is configured to determine the bandwidth of the video communication connection and the hardware of the video transmitting end meets a preset condition, and switch the initial resolution of the video transmitting end to the target resolution, and the target resolution of the video transmitting end is higher than the initial resolution.
  • the switching unit 22 may include:
  • the first determining subunit 221 is configured to determine that a bandwidth of the video communication connection is greater than or equal to a bandwidth preset value.
  • a second determining sub-unit 222 configured to determine that a CPU main frequency of the video sending end is greater than or equal to a preset frequency of the primary frequency;
  • the switching subunit 223 is configured to switch the initial resolution of the video transmitting end to the target resolution according to the determination result of the first determining subunit 221 and the second determining subunit 222.
  • the switching unit 22 may further include:
  • the third determining sub-unit 224 is configured to determine that the frame rate of the video sending end at the initial resolution reaches a preset frame rate and the corresponding network packet loss rate is less than or equal to a preset value of the network packet loss rate.
  • switching unit 22 may further include:
  • An analysis subunit configured to increase a frame rate at the initial resolution to be equivalent to a bandwidth required for a frame rate at the target resolution
  • the third determining subunit 224 is configured to determine an improved initial resolution Whether the frame rate reaches the preset value of the frame rate, and whether the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value.
  • video bandwidth video resolution * video frame rate
  • the frame rate preset value can be: the bandwidth required for the frame rate at the target resolution / initial resolution. For the initial resolution, if you increase the frame rate, it is equivalent to increasing the bandwidth.
  • the video resolution switching apparatus and its components of the embodiment of the present invention can be understood by referring to the switching method of the video resolution provided by the foregoing embodiments, and details are not described herein.
  • the embodiment of the present invention further provides a terminal 40, which includes the video resolution switching apparatus 41 provided by the foregoing embodiment.
  • the video resolution switching device 41 is provided inside the terminal 40 or connected to the outside of the terminal 40.
  • the video resolution switching device 41 determines that the terminal 40 establishes a video communication connection with other terminals, determines the bandwidth of the video communication connection, and the hardware of the terminal 40 conforms to the preset condition, and switches the initial resolution of the terminal 40 to the target resolution, wherein the target The resolution is higher than the initial resolution.
  • the embodiment of the present invention further provides a video resolution switching system 50, including at least two terminals 51 provided by the above embodiments.
  • the video resolution switching system 50 includes two terminals 51 as an example, and the two terminals 51 are respectively two sides of video communication, such as a video transmitting end and a video receiving end.
  • the two terminals 51 After establishing the video communication connection, the two terminals 51 respectively determine the bandwidth of the video communication connection and the respective hardware according to the preset conditions, and switch the respective resolutions to the target resolution.
  • a video resolution switching method specifically applies a flow chart, which illustrates a method for switching video from a resolution of 320*240 to a resolution of 640*480.
  • video A is equivalent to client A of both video communications
  • video B is equivalent to client B of both video communications.
  • the method includes:
  • Both video and B have established a video connection with 320*240 resolution. Start the camera to capture a 320*240 resolution video stream and send a 320*240 resolution video stream to Video B.
  • the video A and B establish video connections, and the specific implementation of the camera to capture and send the video stream is prior art, and will not be described here.
  • Video A continuously sends multiple data packets to video B through the connection channel.
  • video A continuously sends 4 packets to video B through the connection channel.
  • Video B receives multiple data packets, and video B calculates the bandwidth according to the interval between the data packets, and sends the calculation result to video A.
  • video B receives 4 data packets sent by video A, and calculates a bandwidth greater than or equal to 60 KB according to the relationship between the number of transmitted data packets and the bandwidth, and proceeds to step 64, otherwise ends.
  • the video A judges whether the CPU frequency is greater than or equal to the preset frequency.
  • step 65 since the target resolution is 640*480, the CPU consumption of the terminal is relatively large, so it is necessary to judge whether the CPU's main frequency can withstand such a large consumption.
  • the CPU main frequency is greater than or equal to the dual core frequency of 2.0 G Hz, the process proceeds to step 65, otherwise it ends.
  • Step 64 can be understood as a local hardware check.
  • the local hardware check is not limited to the determination of the CPU frequency in step 64, but other methods can also be used.
  • Video A increases the frame rate of 320*240 resolution video at the same time, and performs packet loss detection. By increasing the frame rate at 320*240 resolution to equivalent to the bandwidth required for the frame rate at 640*480 resolution, if the frame rate is greater than or equal to 20 frames at 320*240 resolution, the corresponding network packet loss rate is Less than or equal to 3%, determine that the bandwidth meets the frame rate under 640*480 resolution video, go to step 66, otherwise end. 66.
  • Video A sends a signaling to Video B to enable 640*480 resolution video. For example, video A sends a display graphics array (VGA, Video Graphic Array) video available information to video B, telling video B that it can enable 640*480 resolution video.
  • VGA Video Graphic Array
  • Video B receives the notification signaling sent by Video A, and Video B confirms that it accepts the video of 640*480 resolution and sends confirmation signaling to Video A.
  • Video B sends an acknowledgment signalling to trigger Video A to initiate a VGA video request.
  • Video A receives the confirmation signal of video B, starts the camera to capture the video stream of 640*480 resolution, and sends a video stream of 640*480 resolution to video B.
  • Video A outputs a 640 video stream of 640*480 resolution.
  • the process may be performed by a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium, and the program may include the flow of the embodiments of the above methods when executed.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

视频分辨率的切换方法及装置、 终端及切换系统
本申请要求申请号 201010001654.8 , 申请日 2010年 1月 21 日的中 国专利申请的优先权。 技术领域
本发明涉及通信技术领域， 尤其涉及一种视频分辨率的切换方法及 装置、 终端及切换系统。 发明背景
随着网络技术的不断发展， 网络视频通信得到越来越广泛的应用。 在网络视频通信中， 首先视频双方建立网络连接， 有摄像头的一方或者 双方启动摄像头捕获视频流， 并将捕获的视频流通过建立的网络连接发 送给对方， 接收到视频流的一方将视频呈现给用户。
目前， 大部分用户所处的网络环境并不理想， 网络连接的带宽较小， 只能支持 320*240分辨率的视频。 但是， 也有部分用户的网络环境可以 支持更大分辨率的视频， 如 640*480的分辨率。 然而目前摄像头捕获的 视频流大部分对应 320*240分辨率的视频， 不能为支持更大分辨率的用 户提供更清晰的视频。 发明内容
本发明的实施例提供了一种视频分辨率的切换方法及装置、 终端及 切换系统， 实现视频通信中的分辨率切换。
本发明的实施例提供一种视频分辨率的切换方法， 包括：
确定视频发送端与视频接收端建立视频通信连接， 获得所述视频发 送端的视频初始分辨率； 确定所述视频通信连接的带宽以及所述视频发送端的硬件符合预设 条件， 将所述视频发送端的初始分辨率切换到目标分辨率， 所述目标分 辨率高于所述初始分辨率。
对应的， 本发明的实施例提供一种视频分辨率的切换装置， 包括： 获取单元， 用于确定视频发送端与视频接收端建立视频通信连接， 获得所述视频发送端的视频初始分辨率；
切换单元， 用于确定所述视频通信连接的带宽以及所述视频发送端 的硬件符合预设条件， 将所述视频发送端的初始分辨率切换到目标分辨 率， 所述视频发送端的目标分辨率高于所述初始分辨率。
本发明的实施例还提供一种终端，包括上述视频分辨率的切换装置。 本发明的实施例还提供一种视频分辨率的切换系统， 包括多个上述 终端， 用于实现多个终端间的视频通信。
由上述本发明的实施例提供的技术方案可以看出， 终端间建立视频 通信连接后， 确定使用视频通信的终端硬件及带宽允许的条件下， 可以 切换终端的分辨率， 为终端用户提供更清晰视频， 并保障分辨率的平滑 切换。 附图简要说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例描述 中所需要使用的附图作筒单地介绍， 显而易见地， 下面描述中的附图仅 仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创 造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明一实施例视频分辨率的切换方法流程图；
图 2为本发明一实施例视频分辨率的切换装置的结构示意图； 图 3为本发明另一实施例视频分辨率的切换装置的结构示意图； 图 4为本发明一实施例终端的结构示意图；
图 5为本发明一实施例视频分辨率的切换系统的示意图；
图 6为本发明一实施例视频分辨率的切换方法应用流程图。 实施本发明的方式
为使本发明的目的、 技术方案和优点更加清楚明白， 以下举具体实 施例并参照附图， 对本发明作进一步详细说明。
目前摄像头捕获的视频流大部分对应 320*240分辨率的视频， 从而 导致视频显示不够清晰。 本发明实施例提出了一种视频分辨率的切换方 法， 如将视频分辨率从 320*240分辨率切换到 640*480分辨率， 以便为 支持更大分辨率的用户提供更清晰视频通信。
实施例一
图 1为本发明实施例提供一种视频分辨率的切换方法流程图。 如图 1所示， 该切换方法包括：
11 : 确定视频发送端与视频接收端建立视频通信连接， 获得视频发 送端的视频初始分辨率。
12:确定视频通信连接的带宽以及视频发送端的硬件满足预设条件， 将视频发送端的初始分辨率切换到目标分辨率， 目标分辨率高于初始分 辨率。
以上步骤 11和 12可以由发送终端来执行或者由与一个切换装置来 执行。
由上述本发明的实施例提供的技术方案可以看出， 在视频通信连接 的带宽及终端硬件允许的条件下， 可以切换终端的分辨率。 视频发送端 的初始分辨率低于目标分辨率。 例如， 视频发送端与视频接收端建立视 频通信连接后， 视频发送端的初始分辨率为 320*240的分辨率， 而目标 分辨率 H没为 640*480的分辨率。与 320*240的初始分辨率相比较而言， 640*480的目标分辨率可以为终端用户提供更清晰的视频通信。
具体而言，步骤 12中确定视频通信连接的带宽以及视频发送端的硬 件符合预设条件， 可以包括：
确定视频通信连接的带宽大于或等于一个带宽预设值， 该带宽预设 值根据目标分辨率的大小来设置。
确定视频发送端的 CPU主频大于或等于一个主频预设值，该主频预 设值根据目标分标率的大小来设置。
可选的， 可以在确定视频通信连接的带宽大于或等于带宽预设值之 后，确定视频发送端的 CPU主频大于或等于主频预设值，但具体先后顺 序不受限制。
由于目标分辨率高于视频发送端与视频接收端建立视频通信连接后 视频发送端的分辨率， 例如 640*480分辨率的视频流相当于 320*240分 辨率视频流的 3倍多， 因此为了保证视频发送端能够传送视频数据到视 频接收端， 视频通信连接的带宽需要大于或等于带宽预设值。
而且， 由于视频发送端传送 640*480分辨率的视频流， 视频发送端 的 CPU消耗比较大， 因此需要判断 CPU的主频是否能够承受这么大的 消耗， 例如， 判断视频发送端的 CPU主频是否大于或等于主频预设值。
具体而言，步骤 12中确定视频通信连接的带宽以及视频发送端的硬 件符合预设条件， 还可以包括：
确定视频发送端在初始分辨率下的帧率及对应的网络丟包率符合预 设条件， 比如： 确定在初始分辨率下的帧率是否达到帧率预设值以及对 应的网络丟包率是否小于或等网络丟包率预设值。
由于实际网络应用中， 网络的带宽并不一定代表网络的可用带宽， 则通过提高初始分辨率下的帧率来等效目标分辨率下的帧率所需要的 带宽， 确定初始分辨率下的帧率是否达到帧率预设值， 以及确定对应的 网络丟包率是否小于或等于网络丟包率预设值。 当确定初始分辨率下的 帧率达到帧率预设值， 以及确定对应的网络丟包率小于或等于网络丟包 率预设值时， 可以认为网络带宽满足要求， 将视频发送端的初始分辨率 切换到目标分辨率。
如， 对于视频数据， 视频带宽 =视频分辨率 *视频帧率， 则通过提 高 320*240分辨率下的高帧率来等效 640*480分辨率下低帧率所需要的 视频带宽。 而且， 若视频带宽不允许， 会导致视频数据丟包严重， 则在 提高 320*240分辨率下的帧率同时， 对网络进行丟包检测。 当 320*240 分辨率下帧率大于或等于帧率预设值， 且相应的网络丟包率小于或等于 网络丟包率预设值， 此时视频带宽满足 640*480分辨率下的帧率。
可以知道， 视频发送端与视频接收端建立视频通信连接后， 视频发 送端可以启动摄像头捕获视频流并向视频接收端输出视频流， 此时捕获 视频流的分辨率为初始分辨率， 对视频流进行编码输出， 同理输出视频 流的分辨率也为初始分辨率， 在此不作赘述。
可见， 本发明实施例视频分辨率的切换方法， 可以通过将视频发送 端的捕获视频的初始分辨率切换到目标分辨率， 进而实现将视频发送端 的输出分辨率切换到目标分辨率， 为终端用户提供更清晰的视频通信。
本发明实施例视频分辨率的切换方法， 在确定视频发送端与视频接 收端建立视频通信连接的步骤 11 后， 与视频发送端输出视频流同时， 执行步骤 12 中的确定视频通信连接的带宽以及视频发送端的硬件符合 预设条件并将视频发送端的分辨率切换到目标分辨率。 这样， 将视频发 送端的分辨率切换到目标分辨率过程中， 用户的视频通信实现平滑过 渡， 即避免了切换到目标分辨率后带宽不允许或者硬件不支持而导致的 视频通信中断或视频通信质量下降。 或者， 本发明实施例视频分辨率的切换方法， 可以是： 在确定视频 发送端与视频接收端建立视频通信连接的步骤 11 后， 等待确定视频通 信连接的带宽以及视频发送端的硬件符合预设条件执行完毕， 视频发送 端再向视频接收端输出目标分辨率的视频。 虽然这样会存在一定的等待 时间，但是由于等待时间较小，对进行视频通信的用户体验的影响较小。
本发明实施例视频分辨率的切换方法中， 视频发送端， 可以理解为 视频发送端设备。 同理， 视频接收端， 可以理解为视频接收端设备。
对于视频通信双方而言， 视频发送端对应的视频接收端也可以作为 视频发送端， 也适用本发明实施例视频分辨率的切换方法。 这样， 视频 通信的双方， 通过本发明实施例视频分辨率的切换方法， 实现视频分辨 率的切换， 为终端用户提供更清晰的视频通信。
实施例二
如图 2所示，本发明实施例提供一种视频分辨率的切换装置， 包括： 获取单元 21 , 用于确定视频发送端与视频接收端建立视频通信连 接， 获得视频发送端的视频初始分辨率。
切换单元 22, 用于确定视频通信连接的带宽以及视频发送端的硬件 符合预设条件， 将视频发送端的初始分辨率切换到目标分辨率， 视频发 送端的目标分辨率高于所述初始分辨率。
由上述本发明的实施例提供的技术方案可以看出， 终端间建立视频 通信连接后， 确定使用视频通信的终端硬件及带宽允许的条件下， 可以 切换终端的分辨率， 为终端用户提供更清晰的视频通信， 并保障分辨率 的平滑切换。
如图 3所示， 切换单元 22, 可以包括：
第一确定子单元 221 , 用于确定视频通信连接的带宽大于或等于带 宽预设值。 第二确定子单元 222, 用于确定视频发送端的 CPU主频大于或等于 主频预设值；
切换子单元 223 , 用于根据第一确定子单元 221和第二确定子单元 222的确定结果， 将视频发送端的初始分辨率切换到目标分辨率。
切换单元 22, 还可以包括：
第三确定子单元 224, 用于确定视频发送端在初始分辨率下的帧率 达到帧率预设值及对应的网络丟包率小于或等于网络丟包率预设值。
进一步的， 切换单元 22, 还可以包括：
分析子单元， 用于提高所述初始分辨率下的帧率来等效所述目标分 辨率下的帧率所需要的带宽， 第三确定子单元 224用于确定初始分辨率 下的提高后的帧率是否达到帧率预设值， 以及确定对应的网络丟包率是 否小于或等于网络丟包率预设值。 在这里， 由于视频带宽 =视频分辨 率 *视频帧率， 帧率预设值可以为： 目标分辨率下的帧率所需要的带宽 / 初始分辨率。对于初始分辨率而言，如果提高帧率， 就等效于提高带宽。 因此， 在提高帧率的过程中， 当提高的帧率达到帧率预设值时， 如果对 应的该帧率的网络丟包率小于或等于网络丟包率预设值， 则当前网络带 宽满足目标分辨率对带宽的需求。
本发明实施例视频分辨率的切换装置及其构成部分， 可以参考上述 实施例提供的视频分辨率的切换方法得以理解， 在此不作赘述。
实施例三
如图 4所示， 基于上述实施例提供的视频分辨率的切换装置， 本发 明实施例还提供一种终端 40,其包括上述实施例提供的视频分辨率的切 换装置 41。
视频分辨率的切换装置 41设置在终端 40内部， 或者连接于终端 40 的外部。 视频分辨率的切换装置 41确定终端 40与其它终端建立视频通信连 接后， 确定视频通信连接的带宽以及终端 40 的硬件符合预设条件， 将 终端 40 的初始分辨率切换到目标分辨率， 其中目标分辨率高于初始分 辨率。
由上述本发明的实施例提供的技术方案可以看出， 终端间建立视频 通信连接后， 确定使用视频通信的终端硬件及带宽允许的条件下， 可以 切换终端的分辨率， 为终端用户提供更清晰的视频通信， 并保障分辨率 的平滑切换。
实施例四
如图 5所示， 基于上述实施例提供的视频分辨率的切换装置， 本发 明的实施例还提供一种视频分辨率的切换系统 50, 包括至少两个上述实 施例提供的终端 51。
以视频分辨率的切换系统 50包括 2个终端 51为例， 2个终端 51分 别为视频通信的双方， 如视频发送端与视频接收端。
2个终端 51建立视频通信连接后， 分别确定视频通信连接的带宽以 及各自的硬件符合预设条件， 将各自的分辨率切换到目标分辨率。
由上述本发明的实施例提供的技术方案可以看出， 终端间建立视频 通信连接后， 确定使用视频通信的终端硬件及带宽允许的条件下， 可以 切换终端的分辨率， 为终端用户提供更清晰的视频通信， 并保障分辨率 的平滑切换。
如图 6所示， 本发明一实施例视频分辨率的切换方法具体应用流程 图， 说明视频甲从 320*240分辨率过度到 640*480分辨率的切换方法。 在图 6中， 视频甲等价于视频通信双方的客户端甲， 视频乙等价于视频 通信双方的客户端乙。 该方法包括：
61、 视频甲乙双方已经建立了 320*240分辨率的视频连接， 视频甲 启动摄像头捕获 320*240分辨率的视频流， 并向视频乙发送 320*240分 辨率的视频流。
视频甲乙双方建立视频连接， 摄像头捕获并发送视频流的具体实现 方式为现有技术， 在此不作赘述。
62、 视频甲通过连接通道向视频乙连续发送多个数据包。
例如视频甲通过连接通道向视频乙连续发送 4个数据包。
63、 视频乙接收到多个数据包， 视频乙根据数据包之间的间隔进行 带宽的计算， 并将计算结果发送给视频甲。
例如视频乙接收到视频甲发送的 4个数据包， 并根据发送的数据包 个数与带宽之间的关系计算得到带宽大于或等于 60KB , 进入步骤 64, 否则结束。
上述步骤 62、 63完成了带宽的测量， 具体实现方式为现有技术， 在 此不作赘述。 带宽测量不仅仅限制于步骤 62、 63 的实现方式， 其它可 以实现带宽测量的方式也可以适用。
64、 视频甲判断其 CPU主频是否大于等于主频预设值。
本步骤中， 由于目标分辨率为 640*480, 终端的 CPU消耗比较大， 因此需要判断 CPU的主频是否能承受这么大的消耗。在本实施例中，如 果 CPU主频大于等于双核主频 2.0G Hz, 进入步骤 65 , 否则结束。
步骤 64可以理解为本地硬件检查。本地硬件检查不仅仅限制于步骤 64的判断 CPU主频， 也可以使用其它方式。
65、 视频甲提高 320*240分辨率视频的帧率同时， 进行丟包检测。 通过提高 320*240分辨率下的帧率来等效 640*480分辨率下的帧率 所需要的带宽， 若 320*240分辨率下帧率大于或等于 20帧， 相应的网 络丟包率又小于或等于 3%, 确定带宽满足 640*480分辨率视频下的帧 率， 进入步骤 66, 否则结束。 66、 视频甲发送信令通知视频乙可以启用 640*480分辨率的视频。 如视频甲发送显示绘图阵列 （ VGA, Video Graphic Array )视频可用 信息给视频乙， 告知视频乙可以启用 640*480分辨率的视频。
67、视频乙接收到视频甲发送的通知信令，视频乙确认接受 640*480 分辨率的视频后发送确认信令给视频甲。
例如， 视频乙发送确认信令触发视频甲启动 VGA视频请求。
68、 视频甲接收到视频乙的确认信令， 启动摄像头捕获 640*480分 辨率的视频流， 并向视频乙发送 640*480分辨率的视频流。
例如， 视频甲输出 640*480分辨率的 VGA视频流。
上述步骤 61-68,完成视频分辨率由 320*240切换到 640*480的过程。 对于视频乙而言， 其也可以实现视频分辨率由 320*240 切换到
640*480的过程， 与上述步骤 62-68类似， 在此不再赘述。
由上述本发明的实施例提供的技术方案可以看出， 终端间建立视频 通信连接后， 确定使用视频通信的终端硬件及带宽允许的条件下， 可以 切换终端的分辨率， 为终端用户提供更清晰的视频通信， 并保障分辨率 的平滑切换。
需要说明的是， 对于前述实施例， 为了筒单描述， 故将其都表述为 一系列的动作组合， 但是本领域技术人员应该知悉， 本发明并不受所描 述的动作顺序的限制， 因为依据本发明， 某些步骤可以采用其他顺序或 者同时进行。 其次， 本领域技术人员也应该知悉， 说明书中所描述的实 施例均属于优选实施例， 所涉及的动作和模块并不一定是本发明所必须 的。
在上述实施例中， 对各个实施例的描述都各有侧重， 某个实施例中 没有详述的部分， 可以参见其他实施例的相关描述。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分 流程， 可以通过计算机程序来指令相关的硬件完成， 所述的程序可存储 于计算机可读取存储介质中， 该程序在执行时， 可包括上述各方法的实 施例的流程。 其中， 所述的存储介质可为磁碟、 光盘、 只读存储记忆体
( Read-Only Memory , ROM ) 或随机存^ ^己忆体 ( Random Access Memory, RAM )等。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡 在本发明的精神和原则之内所做的任何修改、 等同替换和改进等， 均应 包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种视频分辨率的切换方法， 其特征在于， 包括：
确定视频发送端与视频接收端建立视频通信连接， 获得所述视频发 送端的视频初始分辨率；
确定所述视频通信连接的带宽以及所述视频发送端的硬件符合预 设条件， 将所述视频发送端的初始分辨率切换到目标分辨率， 所述目标 分辨率高于所述初始分辨率。
2、 根据权要求 1所述的方法， 其特征在于， 所述确定所述视频通信 连接的带宽以及所述视频发送端的硬件符合预设条件， 包括：
确定所述视频通信连接的带宽大于或等于带宽预设值；
确定所述视频发送端的 CPU主频大于或等于主频预设值。
3、 根据权要求 2所述的方法， 其特征在于， 所述确定所述视频通信 连接的带宽以及所述视频发送端的硬件符合预设条件， 还包括：
确定所述视频发送端在初始分辨率下的帧率达到帧率预设值， 以及 对应的网络丟包率小于或等于网络丟包率预设值。
4、 根据权要求 3所述的方法， 其特征在于， 所述确定所述视频发送 端在初始分辨率下的帧率达到帧率预设值， 以及对应的网络丟包率大于 或等于网络丟包率预设值， 包括：
提高所述初始分辨率下的帧率， 确定所述提高的帧率达到帧率预设 值， 以及确定所述提高的帧率对应的网络丟包率小于或等于网络丟包率 预设值。
5、 一种视频分辨率的切换装置， 其特征在于， 包括：
获取单元， 用于确定视频发送端与视频接收端建立视频通信连接， 获得所述视频发送端的视频初始分辨率； 切换单元， 用于确定所述视频通信连接的带宽以及所述视频发送端 的硬件符合预设条件， 将所述视频发送端的初始分辨率切换到目标分辨 率， 所述视频发送端的目标分辨率高于所述初始分辨率。
6、 根据权要求 5所述的装置， 其特征在于， 所述切换单元， 包括： 第一确定子单元， 用于确定所述视频通信连接的带宽大于或等于带 宽预设值；
第二确定子单元， 用于确定所述视频发送端的 CPU主频大于或等于 主频预设值；
切换子单元， 用于所述第一确定子单元和所述第二确定子单元的确 定结果， 将所述视频发送端的初始分辨率切换到目标分辨率。
7、 根据权要求 6所述的装置， 其特征在于， 所述切换单元， 还包括： 第三确定子单元， 用于确定所述视频发送端在初始分辨率下的帧率 达到帧率预设值， 以及对应的网络丟包率小于或等于网络丟包率预设 值。
8、 根据权要求 7所述的装置， 其特征在于， 所述切换单元， 还包括： 分析子单元， 用于提高所述初始分辨率下的帧率， 所述第三确定子 单元用于确定所述提高的帧率大于或等于帧率预设值， 以及确定对应的 网络丟包率小于或等于网络丟包率预设值。
9、 一种终端， 其特征在于， 包括如权要求 5-8中任一所述的视频分 辨率的切换装置。
10、 一种视频分辨率的切换系统， 其特征在于， 包括多个如权要求 9所述的终端， 用于实现所述多个终端间的视频通信。
PCT/CN2011/070226 2010-01-21 2011-01-13 视频分辨率的切换方法及装置、终端及切换系统 WO2011088769A1 (zh)

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