Patent Publication Number: US-2023138804-A1

Title: Enhanced video call method and system, and electronic device

Description:
This application claims priority to Chinese Patent Application No. 202010131423.2, filed with the China National Intellectual Property Administration on Feb. 28, 2020 and entitled “ENHANCED VIDEO CALL METHOD AND SYSTEM, AND ELECTRONIC DEVICE”, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     This application relates to the communications field, and in particular, to an enhanced video call method and system, and an electronic device. 
     BACKGROUND 
     Intelligent electronic devices such as mobile phones and tablet computers have increasingly rich functions. A user may use an application on the electronic device to perform functions such as a video call, screen sharing, and a remote operation. However, in the conventional technology, a function of a video call application is relatively simple. If the user wants to use another function (for example, screen sharing) in a video call process, the user further needs to open another application, and the user may need to switch between two or more applications in a use process. Such an operation manner is complex. 
     SUMMARY 
     Embodiments of this application provide an enhanced video call method and system, and an electronic device, to add other functions, such as screen sharing and remote assistance, to a video call application. This enriches functions of the video call application and simplifies user operations. 
     To resolve the foregoing technical problem, according to a first aspect, an implementation of an embodiment of this application provides an enhanced video call method, including: establishing, by a first electronic device, a video call with a second electronic device; displaying, by the first electronic device, a first video call interface, where the first video call interface includes a screen sharing control; if the first electronic device detects a first operation of a user on the screen sharing control, sending, to the second electronic device, a first request for sharing a screen of the first electronic device; and if the first request is agreed to by the second electronic device, displaying, by the first electronic device, the first video call interface in a first display area of the first electronic device, displaying a shared interface in a second display area of the first electronic device, and sending, by the first electronic device, display data of the shared interface of the first electronic device to the second electronic device. In other words, when the video call is performed, the screen sharing control is displayed on the first video call interface of the first electronic device. Therefore, the first electronic device may share the shared interface with the second electronic device based on the operation performed by the user on the screen sharing control. In addition, the first video call interface and the shared interface are displayed in different areas. This may further facilitate an operation performed by the user on the shared interface. 
     In a possible implementation of the first aspect, the first video call interface further includes a remote assistance control; and the method further includes: sending a second request to the second electronic device if the first electronic device detects a second operation of the user on the remote assistance control, where the second request is used by the first electronic device to request remote assistance from the second electronic device; and if the second request is agreed to by the second electronic device, receiving, by the first electronic device, a remote assistance instruction sent by the second electronic device, executing the remote assistance instruction, and displaying, on the shared interface, an interface for executing the remote assistance instruction. A remote assistance function is added to a video call application, so that remote assistance can be conveniently implemented during a video call and screen sharing, thereby improving user experience. 
     Further, the screen sharing control and the remote assistance control may be separately set as two controls, or may be set as one control. If the screen sharing control and the remote assistance control are set as one control, when the control is operated by the user, the first electronic device sends the first request and the second request to the second electronic device. If the second electronic device agrees to the first request and the second request, the first electronic device shares the shared interface to the second electronic device for displaying, and the second electronic device may perform remote assistance on the first electronic device by using the shared interface. In addition, the first request and the second request may also be sent as one request. 
     In a possible implementation of the first aspect, the enhanced video call method further includes: further displaying, by the first electronic device, a doodle control; displaying a doodle tool control on the shared interface if the first electronic device detects a third operation of the user on the doodle control; and if the first electronic device detects a fourth operation of the user on the doodle tool control, displaying, on the shared interface, a doodle interface corresponding to the fourth operation, and sending, by the first electronic device, doodle data to the second electronic device together with the display data of the shared interface. A doodle function is added to the video application. After completing sharing of the shared interface, the first electronic device may further receive, based on an operation of the user on the doodle control, a doodle of the user on the shared interface and display the doodle, and share the shared interface on which the doodle is displayed to the second electronic device for displaying. The doodle tool control may include controls such as a doodle pen and an eraser. 
     In a possible implementation of the first aspect, the enhanced video call method further includes: receiving, by the first electronic device, a third request that is sent by the second electronic device and that is for performing doodling on the displayed shared interface shared by the first electronic device to the second electronic device, where the second request is a doodle request; if the first electronic device agrees to the third request, making, by the first electronic device, the shared interface of the first electronic device incapable of being operated by the user; and receiving, by the first electronic device, doodle data sent by the second electronic device, and displaying a doodle on the shared interface based on the doodle data. In other words, if the second electronic device needs to perform doodle on the shared interface shared by the first electronic device, the first electronic device needs to agree the second electronic device to perform doodle, and the first electronic device needs to freeze the shared interface of the first electronic device. It should be noted that, that the first electronic device freezes the shared interface of the first electronic device is to prevent the shared interface from being operated by the user, so as to avoid that the shared interface of the first electronic device is operated by the user. This affects doodle display. 
     In a possible implementation of the first aspect, the doodle automatically disappears from the shared interface after a preset time. Certainly, the doodle tool control may also include an eraser tool and the like, so that the doodle can be erased. 
     In a possible implementation of the first aspect, after the doodle disappears from the shared interface, the shared interface of the first electronic device can be operated by the user. 
     In a possible implementation of the first aspect, if the first request is agreed to by the second electronic device, the method further includes: receiving, by the first electronic device, display data that is of a shared interface of the second electronic device and that is sent by the second electronic device, and displaying the shared interface of the second electronic device in the first display area based on the display data. In other words, the screen sharing control may be a control used to initiate bidirectional screen sharing, and the first request may be a bidirectional screen sharing request. Therefore, when the screen sharing control is operated by the user, the first electronic device shares the shared interface of the first electronic device to the second electronic device for displaying, and the second electronic device also shares the shared interface of the second electronic device to the first electronic device for displaying. During the video call, bidirectional screen sharing between the first electronic device and the second electronic device can be conveniently implemented, thereby improving user experience. 
     It should be noted that, when the first electronic device displays the shared interface of the second electronic device in the first display area, the first electronic device displays the first video call interface and the shared interface of the first electronic device in the second display area. Certainly, display manners of the first video call interface, the shared interface of the first electronic device, and the shared interface of the second electronic device may be selected based on a requirement. 
     In a possible implementation of the first aspect, the enhanced video call method includes: further displaying, by the first electronic device, an operation mapping control; if the first electronic device detects a fifth operation performed by the user on the operation mapping control, sending a fourth request used for performing operation mapping to the second electronic device, where the third request is an operation mapping request; and if the fourth request is agreed to by the second electronic device, receiving, by the first electronic device, operation mapping signaling that corresponds to the shared interface of the second electronic device and that is sent by the second electronic device, and displaying an operation mapping interface on the shared interface of the first electronic device based on the operation mapping signaling. During bidirectional screen sharing, the second electronic device may further display, on the shared interface of the first electronic device through operation mapping, an operation on the shared interface of the second electronic device, so as to guide the user to perform the same operation on the first electronic device. 
     In a possible implementation of the first aspect, the enhanced video call method further includes: if the first electronic device detects a sixth operation performed by the user on the operation mapping interface, sending, to the second electronic device, notification information used to notify the second electronic device that the user has performed the sixth operation. The second electronic device may be notified, by using the notification information, of an execution status of the first electronic device about the operation mapping, for example, the execution is completed. 
     In a possible implementation of the first aspect, the enhanced video call method includes: if the first electronic device detects the first operation of the user on the screen sharing control, automatically displaying, by the first electronic device, a split-screen control, where the split-screen control is displayed between the first display area and the second display area. For example, up/down screen splitting or left/right screen splitting may be performed by default, and the split-screen control is displayed in the middle of the screen. The split-screen control may be, for example, a separation bar. 
     In a possible implementation of the first aspect, if the first electronic device detects the first operation of the user on the screen sharing control, the method further includes: displaying, by the first electronic device, a split-screen control display type selection control that is used by the user to select a split-screen control display type; and if the first electronic device detects a seventh operation of the user on the split-screen control display type selection control, displaying a split-screen control based on a split-screen control display type selected by the user, where the split-screen control is displayed between the first display area and the second display area. To be specific, for example, a pop-up window may be displayed in a pop-up window manner, and the split-screen control display type selection control that is used to select a split-screen control display type is displayed in the pop-up window, so that the user triggers selection. For example, the split-screen control display type selection control includes “up/down screen splitting” and “left/right screen splitting”. If the user selects “up/down screen splitting”, the first electronic device displays an interface corresponding to “up/down screen splitting”. If the user selects “left/right screen splitting”, the first electronic device displays an interface corresponding to “left/right screen splitting”. 
     In a possible implementation of the first aspect, if the first electronic device is connected to a third electronic device, the method further includes: if the first electronic device detects the first operation of the user on the screen sharing control, displaying, a screen sharing device selection control used by the user to select a device for screen sharing; and if the user selects the first electronic device as a screen sharing device, sending, by the first electronic device, the display data of the shared interface of the first electronic device to the second electronic device; or if the user selects the third electronic device as a screen sharing device, sending, by the first electronic device, display data of a shared interface of the third electronic device to the second electronic device. In other words, if the first electronic device is further connected to another electronic device, the first electronic device may further share a screen of the another electronic device to the second electronic device for displaying. 
     In a possible implementation of the first aspect, if the first electronic device is connected to a third electronic device, the method further includes: if the first electronic device receives a fifth request that is used for screen sharing and that is sent by the second electronic device, displaying, by the electronic device, a screen sharing device selection control used by the user to select a device for screen sharing; and if the user selects the first electronic device as a screen sharing device, receiving, by the first electronic device, the display data that is of the shared interface of the second electronic device and that is sent by the second electronic device, and displaying the shared interface; or if the user selects the third electronic device as a screen sharing device, receiving, by the first electronic device, the display data that is of the shared interface of the second electronic device and that is sent by the second electronic device, and sending the display data to the third electronic device. In other words, if the first electronic device is further connected to another electronic device, the first electronic device may further send the shared interface shared by the second electronic device to the another electronic device for displaying. 
     In a possible implementation of the first aspect, the enhanced video call method includes: if the first request is agreed to by the second electronic device, establishing, between the first electronic device and the second electronic device, at least one screen sharing streaming media transfer channel that is independent of a video call streaming media transfer channel, so as to transmit the display data of the shared interface, where the video call streaming media transfer channel is used to transmit video call data between the first electronic device and the second electronic device. Further, each screen sharing streaming media transfer channel corresponds to data transmission between a shared interface and a display interface of the shared interface. It should be noted that, the screen sharing streaming media transfer channel that is independent of the video call streaming media transfer channel is established to transmit the display data of the shared interface, so that the video call and the screen sharing do not interfere with each other, thereby improving user experience of the video call and the screen sharing. 
     In a possible implementation of the first aspect, after the second request is agreed to by the second electronic device, a remote assistance operation signaling channel is established between the first electronic device and the second electronic device, so as to transmit remote assistance signaling. 
     In a possible implementation of the first aspect, after the doodle control is operated by the user, a doodle signaling channel is established between the first electronic device and the second electronic device, to transmit the third request. In addition, after the doodle disappears, the second electronic device may further send, to the first electronic device through the doodle signaling channel, a message used to notify that the doodle disappears. 
     In a possible implementation of the first aspect, after the fourth request is agreed to by the second electronic device, an operation mapping signaling channel is established between the first electronic device and the second electronic device, so as to transmit the foregoing operation mapping signaling and transmit notification information. 
     In a possible implementation of the first aspect, the operation mapping signaling includes mapping mark code information, operation domain information, operation object information, and operation code information. 
     In a possible implementation of the first aspect, the enhanced video call method further includes: if the first request is agreed to by the second electronic device, displaying, by the first electronic device, a side tool bar control on a side edge of the screen; and if the first electronic device detects an eighth operation of the user on the side tool bar control, displaying, by the first electronic device, an interface corresponding to the eighth operation. The eighth operation may be an operation such as dragging or sliding. The side tool bar may include at least one of the screen sharing control, the doodle control, and the operation mapping control, and may further include another control. 
     According to a second aspect, an implementation of an embodiment of this application provides an enhanced video call method, including: establishing, by a second electronic device, a video call with a first electronic device, where the second electronic device displays a second video call interface; receiving, by the second electronic device, a first request that is for sharing a screen of the first electronic device and that is sent by the first electronic device, and displaying, on the second video call interface, a first confirmation control used by a user to confirm the first request; if the second electronic device detects a ninth operation of the user on the first confirmation control, sending, to the first electronic device, a first reply indicating that the first request is agreed to; and receiving, by the second electronic device, display data that is of a shared interface of the first electronic device and that is sent by the first electronic device, displaying, by the second electronic device, the second video call interface in a first display area of the second electronic device, and displaying, in a second display area of the second electronic device, the shared interface corresponding to the display data. The second electronic device that performs a video call with the first electronic device receives and displays the shared interface shared by the first electronic device, so as to implement screen sharing between the first electronic device and the second electronic device. 
     In a possible implementation of the first aspect, the enhanced video call method includes: receiving, by the second electronic device, a second request sent by the first electronic device, and displaying a second confirmation control used by the user to confirm the second request, where the second request is used by the first electronic device to request remote assistance from the second electronic device; if the second electronic device detects a tenth operation of the user on the second confirmation control, sending, to the first electronic device, a second reply indicating that the second request is agreed to; and sending a remote assistance instruction to the second electronic device if the second electronic device detects an eleventh operation performed by the user on the shared interface. 
     In a possible implementation of the first aspect, the enhanced video call method includes: further displaying, by the second electronic device, a doodle control; if the second electronic device detects a twelfth operation of the user on the doodle control, sending, to the first electronic device, a third request for performing doodling on the displayed shared interface shared by the first electronic device to the second electronic device; and if the third request is agreed to by the first electronic device, and the second electronic device detects a thirteenth operation performed by the user on the shared interface, displaying, on the shared interface of the second electronic device, a doodle interface corresponding to the thirteenth operation, and sending doodle data to the first electronic device. 
     In a possible implementation of the first aspect, if the second electronic device agrees to the first request, the method further includes: receiving, by the second electronic device, the display data that is of the shared interface of the first electronic device and that is sent by the first electronic device, and displaying the shared interface of the first electronic device in the first display area of the second electronic device based on the display data. 
     In a possible implementation of the first aspect, the enhanced video call method includes: receiving, by the second electronic device, a fourth request that is sent by the first electronic device and that is used to perform operation mapping, and displaying a third confirmation control that corresponds to the fourth request and that is used by the user to confirm the fourth request; sending a third reply to the first electronic device if the second electronic device detects a fourteenth operation of the user on the third confirmation control; and if the second electronic device detects a fifteenth operation performed by the user on the shared interface of the second electronic device, displaying an interface corresponding to the fifteenth operation, and sending operation mapping signaling to the first electronic device. 
     In a possible implementation of the first aspect, the method further includes: receiving, by the second electronic device, notification information sent by the first electronic device, and displaying an interface corresponding to the notification information, where the notification information is used to notify the second electronic device that the user has performed a sixth operation, and the sixth operation is an operation performed by the user on the operation mapping interface on the first electronic device. 
     In a possible implementation of the first aspect, if the second electronic device agrees to the first request, the second electronic device automatically displays the split-screen control. 
     In a possible implementation of the first aspect, if the second electronic device agrees to the first request, the method further includes: displaying, by the second electronic device, a split-screen control display type selection control that is used by the user to select a split-screen control display type; and if the second electronic device detects a trigger operation of the user on the split-screen control display type selection control, displaying a split-screen control based on a split-screen control display type selected by the user. 
     In a possible implementation of the first aspect, if the second electronic device is connected to a fourth electronic device, the method further includes: if the second electronic device agrees to the first request, displaying, by the second electronic device, a screen sharing device selection control used by the user to select a device for screen sharing; and if the user selects the second electronic device as a screen sharing device, sending, by the second electronic device, the display data of the shared interface of the second electronic device to the first electronic device; or if the user selects the fourth electronic device as a screen sharing device, sending, by the second electronic device, the display data of the shared interface of the fourth electronic device. 
     In a possible implementation of the first aspect, if the second electronic device is connected to a fourth electronic device, the method further includes: if the second electronic device sends a fifth request used for screen sharing to the first electronic device, displaying, by the second electronic device, a screen sharing device selection control used by the user to select a device for screen sharing; and if the user selects the second electronic device as a screen sharing device, receiving, by the second electronic device, the display data that is of the shared interface of the first electronic device and that is sent by the first electronic device, and displaying the shared interface; or if the user selects the fourth electronic device as a screen sharing device, receiving, by the second electronic device, the display data that is of the shared interface of the first electronic device and that is sent by the first electronic device, and sending the display data to the fourth electronic device. 
     In a possible implementation of the first aspect, if the second electronic device agrees to the first request, the second electronic device displays a side tool bar control on a side edge of the screen; and if the second electronic device detects an operation of the user on the side tool bar control, the first electronic device displays an interface corresponding to the operation. 
     According to a third aspect, an implementation of an embodiment of this application provides an enhanced video call system, including: a first electronic device and a second electronic device, where the first electronic device establishes a communication connection to the second electronic device, the first electronic device executes the enhanced video call method provided in the first aspect and/or any possible implementation of the first aspect, and the second electronic device executes the enhanced video call method provided in the second aspect and/or any possible implementation of the second aspect. It should be noted that, both the first electronic device and the second electronic device may perform the foregoing enhanced video call method by using a same application. Therefore, when the enhanced video call method is not performed, the first electronic device and the second electronic device have a same or corresponding display interface. 
     The enhanced video call system provided in this embodiment of this application includes a first electronic device configured to perform the enhanced video call method provided in any one of the first aspect and/or the possible implementations of the first aspect. Therefore, beneficial effects (or advantages) of the enhanced video call method provided in the third aspect can also be implemented. 
     According to a fourth aspect, an implementation of an embodiment of this application provides an electronic device, including: a memory, configured to store a computer program, where the computer program includes program instructions; and a processor, configured to execute the program instructions, so that the electronic device performs the foregoing enhanced video call method. 
     According to a fifth aspect, an implementation of an embodiment of this application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, the computer program includes program instructions, and the program instructions are run by an electronic device to enable the electronic device to perform the foregoing enhanced video call method. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       To describe the technical solutions in the embodiments of this application more clearly, the following briefly describes the accompanying drawings for describing the embodiments. 
         FIG.  1    is a schematic diagram of a structure of a mobile phone according to an embodiment of this application; 
         FIG.  2    is a block diagram of a structure of a communications system according to an embodiment of this application; 
         FIG.  3    is a block diagram of a software structure of a mobile phone according to an embodiment of this application; 
         FIG.  4 A- 1    and  FIG.  4 A- 2    are a flowchart of a method for performing a video call and remote assistance according to an embodiment of this application; 
         FIG.  4 B- 1    and  FIG.  4 B- 2    are a flowchart of a doodling method according to an embodiment of this application; 
         FIG.  4 C- 1    and  FIG.  4 C- 2    are a flowchart of a method for performing bidirectional screen sharing and operation mapping according to an embodiment of this application; 
         FIG.  5 A  to  FIG.  5 P  are schematic diagrams of some interfaces of mobile phones M 1  and M 2  according to an embodiment of this application; 
         FIG.  6 A  to  FIG.  6 C- 2    are schematic diagrams of other interfaces of mobile phones M 1  and M 2  according to an embodiment of this application; 
         FIG.  6 D- 1    to  FIG.  6 F  are schematic diagrams of some interfaces of electronic devices according to an embodiment of this application; and 
         FIG.  7    is a schematic diagram of a structure of an electronic device according to an embodiment of this application. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following further describes in detail implementations of embodiments of this application with reference to accompanying drawings. 
     The embodiments of this application mainly relate to an enhanced video call method applied to electronic devices. The electronic devices include an electronic device such as a mobile phone, a tablet computer, a television, a notebook computer, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a handheld computer, a netbook, a personal digital assistant (personal digital assistant, PDA), a wearable device, or a virtual reality device. 
     It should be noted that, in this embodiment of this application, the electronic device is an electronic device that can perform wireless communication with another electronic device, the electronic device has a screen, and supports a screen splitting function and/or a screen selection function, and the electronic device has a video call function. 
     The enhanced video call method provided in this embodiment of this application may be applied to the foregoing electronic device. For example, the electronic device may be a mobile phone. 
       FIG.  1    is a schematic diagram of a structure of a mobile phone  100  according to an embodiment of this application. 
     The mobile phone  100  may include a processor  110 , an external memory interface  120 , an internal memory  121 , a universal serial bus (universal serial bus, USB) interface  130 , a charging management module  140 , a power management module  141 , a battery  142 , an antenna  1 , an antenna  2 , a mobile communications module  150 , a wireless communications module  160 , an audio module  170 , a speaker  170 A, a receiver  170 B, a microphone  170 C, a headset jack  170 D, a sensor module  180 , a button  190 , a motor  191 , an indicator  192 , a camera  193 , a display  194 , a subscriber identification module (subscriber identification module, SIM) card interface  195 , and the like. The sensor module  180  may include a pressure sensor  180 A, a touch sensor  180 K, and the like. 
     It may be understood that an illustrated structure in the embodiments of the present invention does not constitute a limitation on the mobile phone  100 . In some other embodiments of this application, the mobile phone  100  may include more or fewer components than those shown in the figure, or combine some components, or split some components, or have different component arrangements. 
     The processor  110  may include one or more processing units. For example, the processor  110  may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a video codec, a digital signal processor (digital signal processor, DSP), and a baseband processor. Different processing units may be independent components, or may be integrated into one or more processors. A memory may be further disposed in the processor  110 , and is configured to store instructions and data. The processor  110  is configured to enable the mobile phone  100  to perform the enhanced video call method provided in the embodiments of this application. 
     A wireless communication function of the mobile phone  100  may be implemented through the antenna  1 , the antenna  2 , the mobile communications module  150 , the wireless communications module  160 , the modem processor, the baseband processor, and the like. 
     The mobile communications module  150  may provide a wireless communication function such as 2G/3G/4G/5G applied to the mobile phone  100 . 
     The wireless communications module  160  may provide a wireless communications solution including a wireless local area network (wireless local area networks, WLAN) (for example, a wireless fidelity (wireless fidelity, Wi-Fi) network) and Bluetooth (bluetooth, BT) that is applied to the mobile phone  100 . 
     In some embodiments, the antenna  1  and the mobile communications module  150  of the mobile phone  100  are coupled, and the antenna  2  and the wireless communications module  160  are coupled, so that the mobile phone  100  can communicate with a network and another device by using a wireless communication technology. 
     The application processor outputs a sound signal by using an audio device (which is not limited to the speaker  170 A, the receiver  170 B, or the like), or displays an image or a video on the display  194 . 
     The mobile phone  100  implements a display function by using the GPU, the display  194 , the application processor, and the like. The GPU is a microprocessor for image processing, and is connected to the display  194  and the application processor. The GPU is configured to: perform mathematical and geometric computation, and render an image. The processor  110  may include one or more GPUs, which execute program instructions to generate or change display information. 
     The display  194  is configured to display an image, a video, and the like. In some embodiments, the mobile phone  100  may include one or N displays  194 . Herein, N is a positive integer greater than 1. 
     The mobile phone  100  may implement a photographing function and a video call function by using the ISP, the camera  193 , the video codec, the GPU, the display  194 , the application processor, and the like. In some embodiments, the mobile phone  100  may include one or N cameras  193 , where N is a positive integer greater than 1. Further, the mobile phone  100  includes at least one camera  193  located on a same side as the display  194 . 
     The video codec is configured to compress or decompress a digital video. The mobile phone  100  may support one or more video codecs. In this way, the mobile phone  100  may play or record videos in a plurality of encoding formats, for example, moving picture experts group (moving picture experts group, MPEG)1, MPEG2, MPEG3 and MPEG4. In addition, the mobile phone may encapsulate and play audio/video data and screen recording data. 
     The mobile phone  100  may implement an audio function such as video calling, music playing or recording through the audio module  170 , the speaker  170 A, the telephone receiver  170 B, the microphone  170 C, the headset jack  170 D, the application processor, and the like. 
     The audio module  170  is configured to convert digital audio information into an analog audio signal for output, and is also configured to convert analog audio input into a digital audio signal. The audio module  170  may be further configured to code and decode an audio signal. In some embodiments, the audio module  170  may be disposed in the processor  110 , or some functional modules in the audio module  170  are disposed in the processor  110 . 
     The speaker  170 A, also referred to as a “loudspeaker”, is configured to convert an audio electrical signal into a sound signal. The mobile phone  100  may make a video call, listen to music, or listen to a hands-free call by using the speaker  170 A. 
     The receiver  170 B, also referred to as an “earpiece”, is configured to convert an electrical audio signal into a sound signal. When a call is answered or voice information is received by using the mobile phone  100 , the receiver  170 B may be put close to a human ear to listen to a voice. 
     The microphone  170 C, also referred to as a “mike” or a “mic”, is configured to convert a sound signal into an electrical signal. 
     The headset jack  170 D is configured to connect to a wired headset. 
     The pressure sensor  180 A is configured to sense a pressure signal, and can convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor  180 A may be disposed on the display  194 . When a touch operation is performed on the display  194 , the mobile phone  100  detects intensity of the touch operation by using the pressure sensor  180 A. The mobile phone  100  may also calculate a touch position based on a detection signal of the pressure sensor  180 A. 
     The touch sensor  180 K is also referred to as a “touch component”. The touch sensor  180 K may be disposed on the display  194 , and the touch sensor  180 K and the display  194  constitute a touchscreen, which is also referred to as a “touch screen”. The touch sensor  180 K is configured to detect a touch operation performed on or near the touch sensor. The touch sensor  180 K may transfer the detected touch operation to the application processor to determine a touch event type. A visual output related to the touch operation may be provided through the display  194 . In some other embodiments, the touch sensor  180 K may alternatively be disposed on a surface of the mobile phone  100 , and is located on a position different from that of the display  194 . 
     In this embodiment of this application, the mobile phone  100  may detect a trigger operation of a user on the display  194  based on the pressure sensor  180 A and the touch sensor  180 K, or may detect voice input of a user based on the receiver  170 B, or may detect gesture input of a user based on the camera  193 , or detect input of a user based on an input module such as another input keyboard. This is not limited in this embodiment. 
     The following describes the embodiments of this application by using a mobile phone as an example. 
       FIG.  2    is a block diagram of a structure of a communications system according to an embodiment of this application. 
     The communications system includes a mobile phone M 1 , a push server P 1 , a server H, a push server P 2 , and a mobile phone M 2 , where a user of the mobile phone M 1  is a user N 1 , and a user of the mobile phone M 2  is a user N 2 . The mobile phone M 1  communicates with the push server P 1  through a communication network. The mobile phone M 2  communicates with the push server P 2  through a communication network. The push server P 1  and the push server P 2  communicate with the server H through a communication network. The mobile phone M 1  and the mobile phone M 2  perform communication interaction with the push server P 2  through the push server P 1  and the server H. 
     It should be noted that, in another implementation of this embodiment of this application, the push server P 1  and the push server P 2  may alternatively be devices of another type, provided that the devices meet a requirement for communication between the mobile phone M 1  and the server H and between the mobile phone M 2  and the server H. Further, in another implementation of this embodiment of this application, the mobile phone M 1  and the mobile phone M 2  may directly communicate with the server H without using another server. This may be specifically set as required. 
     In some embodiments of this application, a communications application is installed on both the mobile phone M 1  and the mobile phone M 2 . The communications application has a video call function, and optionally, further has at least one of functions such as bidirectional screen sharing, remote assistance, doodle, and operation mapping. The communications application may be logged in to by using account information and a password of the user. For a specific login manner, refer to the conventional technology. This is not limited in this embodiment of this application. A user N 1  starts a communications application in the mobile phone M 1 , and initiates a video call request to a user N 2 . If the user N 2  operates the mobile phone M 2  and accepts the video call request, the user N 1  and the user N 2  may perform a video call. 
     It should be noted that, in this application, the video call means that the mobile phone M 1  and the mobile phone M 2  have a function of performing a video call between the user N 1  and the user N 2 . The bidirectional screen sharing means that the mobile phone M 1  shares a screen of the mobile phone M 1  to the mobile phone M 2  for displaying. In this process, the mobile phone M 2  also shares a screen of the mobile phone M 2  to the mobile phone M 1  for displaying. The remote assistance means that the mobile phone M 1  shares the screen of the mobile phone M 1  with the mobile phone M 2  for displaying, and the mobile phone M 2  may perform a long-distance control and operation on the mobile phone M 1 . The doodle means that the mobile phone M 1  may display, on the screen of the mobile phone M 1  based on a trigger operation of the user N 1 , doodle content such as a line or a picture that is associated with the trigger operation of the user N 1 . The operation mapping means that the mobile phone M 2  maps an operation performed by the user N 2  on the mobile phone M 2  to the mobile phone M 1 , so that the user N 1  can perform a same operation by using mapping display on the mobile phone M 1 . This is described in the following with reference to specific embodiments. 
     In a process in which the mobile phones M 1  and M 2  perform video communication, interfaces of the video call displayed by the mobile phones M 1  and M 2  may both provide more function controls, for example, bidirectional screen sharing and remote assistance. If the user N 1  enables a function such as bidirectional screen sharing or remote assistance by using these function controls, and the user N 2  operates the mobile phone M 2  to accept a request of the function, the mobile phone M 1  may further display an interface corresponding to the function in another area while displaying the interface of the video call. Correspondingly, the mobile phone M 2  may also display the interface of the video call and the interface corresponding to the function at the same time. 
     In an example in which remote assistance is performed in a video call process, the mobile phone M 1  is used as a requesting party of remote assistance, and the mobile phone M 2  is used as an assisting party of remote assistance, so that the user N 2  may perform an operation on the mobile phone M 2  to remotely assist in operating the mobile phone M 1 . It should be noted that, in this application, performing remote assistance means that the mobile phone M 1  shares the screen of the mobile phone M 1  with the mobile phone M 2  for displaying, and the mobile phone M 2  may perform remote assistance on the mobile phone M 1  based on the screen shared by the mobile phone M 1 . Specifically, the mobile phone M 1  communicates with the mobile phone M 2  through a communication network. The mobile phone M 1  initiates a remote assistance request. After the mobile phone M 2  accepts the request, the mobile phone M 1  authorizes an operation right to the mobile phone M 2 . The mobile phone M 1  transmits image information displayed on the screen of the mobile phone M 1  to the mobile phone M 2  through a communication channel, so that the mobile phone M 2  performs synchronous display, thereby implementing screen sharing. In addition, the user N 2  performs a remote auxiliary operation by using the mobile phone M 2 , and the mobile phone M 2  transmits remote auxiliary operation signaling corresponding to the remote auxiliary operation to the mobile phone M 1  by using the signaling channel, so that the mobile phone M 1  performs a corresponding operation based on the remote auxiliary operation signaling, thereby implementing the remote auxiliary operation performed by the user N 2  on the mobile phone M 1  by using the mobile phone M 2 . 
     The mobile phone M 1  and the mobile phone M 2  may have a screen splitting function. When screen splitting needs to be performed, a screen may be split into at least two display areas, to separately display different content or display same content. Alternatively, the mobile phone M 1  and the mobile phone M 2  may include at least two physical screens. The two screens may be separately used as independent screens, or the at least two physical screens may be combined into one screen and used as an entire screen. In this embodiment of this application, the mobile phone M 1  and the mobile phone M 2  may select, based on a user requirement, a screen from a plurality of screens to display different content during screen sharing. 
       FIG.  3    is a block diagram of a software structure of a mobile phone according to an embodiment of this application. In a layered architecture, software is divided into several layers, and each layer has a clear role and division of labor. The layers communicate with each other through a software interface. In some embodiments, an Android system is divided into four layers: an application layer, an application framework layer, a system library, and a kernel layer from top to bottom. 
     The application layer may include a series of applications, for example, including a HiCall app and a VoipService. The HiCall app is a communications application that supports a video call and screen sharing and that is provided in this embodiment of this application, and has a visualized user interface. The VoipService provides support for the HiCall app, and has no visualized user interface. 
     The application layer may include applications such as a camera, a gallery, a calendar, a call, a map, navigation, Bluetooth, music, a video, and an SMS message. 
     An application interface provided by the HiCall app includes some function controls. The function controls are displayed in a form of a side tool bar or in a form of another type of touch control on the screen, and may be displayed based on different scenarios in which the application is located. In this embodiment of this application, the function control may include one or more of five controls: “Video call”, “Remote assistance”, “Bidirectional screen sharing”, “Doodle”, and “Operation mapping”, and display content of the function control on the screen includes an icon and a text. 
     For example, for formats of the five controls “Video call”, “Remote assistance”, “Bidirectional screen sharing”, “Doodle”, and “Operation mapping”, refer to the formats in the side tool bars in  FIG.  5 D- 1    and  FIG.  5 D- 2   . Optionally, the side tool bar may display only some of the five controls, or display many other controls. 
     For example, if the mobile phone M 1  detects an operation of triggering the “Video call” control by the user N 1 , a video call is established between the mobile phone M 1  and the mobile phone M 2 . 
     If the mobile phone M 1  detects an operation of triggering the “Remote assistance” control by the user N 1 , remote assistance is established between the mobile phone M 1  and the mobile phone M 2 . 
     If the mobile phone M 1  detects a trigger operation performed by the user N 1  on the “Bidirectional screen sharing” control, the mobile phone M 1  shares the screen of the mobile phone M 1  to the mobile phone M 2  for displaying, and at the same time, the mobile phone M 2  shares the screen of the mobile phone M 2  to the mobile phone M 1  for displaying. 
     If the mobile phone M 1  detects an operation of triggering the “Doodle” control by the user N 1 , the mobile phone M 1  receives a doodle operation performed by the user N 1 , and shares a screen including the doodle to the mobile phone M 2  for displaying, or the mobile phone M 2  receives a doodle operation performed by the user N 2 , and shares the screen including the doodle to the mobile phone M 1  for displaying. 
     If the mobile phone M 1  detects an operation of triggering the “Operation mapping” control by the user N 1 , operation mapping is performed between the mobile phone M 1  and the mobile phone M 2 . 
     The HiCall app includes an InCallUI app and a Telecom app. The InCallUI app is responsible for displaying and adaptation of a communications interface. For example, the InCallUI app includes an interface switching portal of service functions such as the foregoing video call, bidirectional screen sharing, remote assistance, doodle, and operation mapping, to display a corresponding interface. 
     The Telecom app is responsible for communication logic control, for example, conflict management of a call. 
     The VoipService is responsible for service logic control, including implementing functions such as voice call, video call, device discovery, message service, service function switchover, doodle, and operation mapping, and synthesizing and parsing operation mapping signaling. The capabilities are encapsulated into service APIs for the HiCall app to use. 
     The VoipService includes a media component and a service transmission component. The service transmission component includes a signaling channel management module. The signaling channel management module manages signaling channels, including creating communication channels and managing a plurality of channels. The channel includes a video call streaming media transfer channel, a screen sharing streaming media transfer channel, a remote assistance operation signaling channel, a doodle signaling channel, an operation mapping signaling channel, and the like. In this embodiment of this application, the video call streaming media transfer channel, the screen sharing streaming media transfer channel, the remote assistance operation signaling channel, the doodle signaling channel, the operation mapping signaling channel, and the like are all constructed and managed by the service transmission component. 
     The media component includes a streaming media information processing module. The streaming media information processing module is responsible for processing and transmitting streaming media information, and provides capabilities such as audio and video encoding and decoding and transmission. The streaming media information processing module is configured to implement processing of audio call streaming media data, video call streaming media data, and screen sharing streaming media data, including capturing a screen in real time, encoding an audio and a video into video frames, and transmitting the video frames to a peer device to implement screen sharing. 
     As a communication platform SDK, VoipService can be integrated with a plurality of devices and device apps to meet cross-platform requirements. An interaction protocol stack (communication platform SDK) based on a communication cloud signaling system is implemented, and signaling-plane interaction control for account management, device and capability discovery, NG-RTC audio and video (including P2P), and messages is implemented. In addition, the media component is provided by the cloud core NG-RTC (including capabilities such as audio and video encoding and decoding and transmission, which are used to implement audio and video media plane interaction based on the RTN network). The signaling channel management module and the media component can be deployed independently or together, and the media component can be replaced. 
     VoipService can be HwVoipService. The streaming media information processing module may be an HME (Huawei Media Engine, Huawei streaming media engine). 
     The application framework layer (framework layer) provides an application programming interface (application programming interface, API) and a programming framework for an application at the application layer. The application framework layer includes some predefined functions. 
     The application framework layer includes system services, for example, includes an activity manager service (Activity Manager Service, AMS), a window manager service (Window Manager Service, WMS), a view system (VIEW system), a content provider, a phone manager, and a resource manager. In addition, the application framework layer may further include an MSDP (Multicast Source Discovery Protocol, Multicast Source Discovery Protocol) awareness service and a multipath access service. This is not limited in this embodiment of this application. 
     The AMS, the WMS, and the VIEW provide capability support for doodle, operation mapping, and the like in this embodiment of this application. The AMS provides a basic UX interaction capability. The WMS is responsible for calculating a window area and providing operation domain information in the operation mapping signaling. The VIEW provides an operation object listening capability. Based on a response or callback of the last application, the VIEW captures a user operation behavior, records the operation object, and provides the operation object and operation code information in the operation mapping signaling. 
     Further, a screen splitting technology is based on a system service capability of the framework. The system service of the framework provides an interface for a user to specify a screen for screen sharing, for example, to specify a shared screen and a displayed screen of the shared screen, and specified information is transmitted to the AMS and the WMS. The WMS calculates a screen size of a mobile phone, calculates a position of the mobile phone for screen splitting, and other information. The system service allocates a window based on the specified information and a calculation result. For example, based on a user habit, a left screen is a first screen and a right screen is a second screen by default; or based on a user habit, an upper screen is a first screen and a lower screen is a second screen by default. 
     During screen sharing, an audio call image interface and a video call image interface can be displayed in small windows. The user can specify a screen to be shared, a screen to be shared by a peer end, and a screen to be displayed during a video call. If there is another device near the mobile phone, the mobile phone may transmit user-specified information to the another device by using near field communication signaling. A device type can be identified through signaling transmission. For example, a large-screen (TV) device is a video call device by default, which is responsible for displaying video call images. Devices such as mobile phones and PADs are responsible for screen sharing and operations by default. 
     Further, the system service of the framework feeds back the captured operation mapping signaling to the application layer, and the VoipService generates operation mapping signaling based on the operation mapping signaling fed back by the system service, and then transmits the signaling through the signaling channel. 
     The MSDP awareness service and the multipath access service are basic components of an existing audio call and video call, and the kernel layer is based on the existing audio call and video call. The kernel layer is the same as that in the conventional technology. Details are not described herein again. 
     The system library, the kernel layer, and the like below the application framework layer may be referred to as an underlying system. The underlying system includes an underlying display system, configured to provide a display service. For example, the underlying display system includes a display driver at the kernel layer and a surface manager (surface manager) in the system library. 
     An Android runtime (Android Runtime) includes a kernel library and a virtual machine. The Android runtime is responsible for scheduling and management of an Android system. 
     The kernel library includes two parts: a performance function that needs to be invoked in java language, and a kernel library of Android. 
     The application layer and the application framework layer run on the virtual machine. The virtual machine executes java files of the application layer and the application framework layer as binary files. The virtual machine is configured to implement functions such as object lifecycle management, stack management, thread management, security and exception management, and garbage collection. 
     The system library may include a plurality of functional modules, for example, a surface manager (surface manager) and a media library (Media Libraries). The surface manager is configured to manage a display subsystem and provide fusion of  2 D and  3 D layers for a plurality of applications. The media library supports playback and recording in a plurality of commonly used audio and video formats, and static image files. The media library may support a plurality of audio and video encoding formats, for example, MPEG4, H.264, MP3, AAC, AMR, JPG, and PNG. 
     The kernel layer is a layer between hardware and software. The kernel layer includes at least a display driver, a camera driver, an audio driver, and the like. This is not limited in embodiments of this application. That is, the kernel layer mainly includes hard coding, an MSDP virtualization device corresponding to the foregoing MSDP awareness service, and the like. 
     Based on the schematic software structure diagram shown in  FIG.  3   , the following briefly describes an internal working process of a mobile phone system. 
     For example, in this embodiment of this application, when a video call needs to be made, as shown in  FIG.  5 A , the user N 1  starts the HiCall app in the mobile phone M 1 , and the user N 1  enables a communications interface with the user N 2 . The communications interface is shown in  FIG.  5 B , and includes a name of the user N 2 , and video call, call, and SMS controls. The communications interface may further display other controls such as a call record. The communications interface may be selected based on a requirement. 
     Then, the user N 1  triggers the “Video call” control shown in  FIG.  5 B . The HiCall app notifies, based on the trigger operation of the user, the service transmission component to establish the video call streaming media transfer channel. The service transmission component sends a request for establishing the video call streaming media transfer channel to the service transmission component in the mobile phone M 2 . After the mobile phone M 2  confirms to perform a video call based on an input of the user, the mobile phone M 1  establishes the video call streaming media transfer channel with the mobile phone M 2  by using the service transmission component. The HiCall apps in the mobile phone M 1  and the mobile phone M 2  send a processing request for the video call streaming media data to their respective media components, and a streaming media information processing module in the media components encapsulates and parses the video call streaming media data (including video image data and audio data), so as to implement a video call. For example, the media component in the mobile phone M 1  sends the encapsulated video call streaming media data to the video call streaming media transfer channel, and the video call streaming media transfer channel sends the encapsulated video call streaming media data to the peer mobile phone of the video call, that is, the mobile phone M 2 . The media component in the mobile phone M 2  parses the video call streaming media data sent by the mobile phone M 1  through the video call streaming media transfer channel, and sends the parsed video call streaming media data to the InCallUI app. The InCallUI app implements display of a video call interface of the mobile phone M 1  based on the video call streaming media data. A process in which the mobile phone M 1  implements display of the video call interface of the mobile phone M 2  is similar. Details are not described herein again. 
     In addition, the video call streaming media data of the mobile phone that is encapsulated by the media component may be audio and video data collected by a camera and a microphone of the mobile phone. In addition, the InCallUI app displays a video call interface of the user of the mobile phone based on the audio and video data collected by the camera and the microphone of the mobile phone. 
     In this embodiment of this application, screen sharing is performed between the mobile phone M 1  and the mobile phone M 2  based on a video call. After the mobile phone M 1  initiates a screen sharing request and the mobile phone M 2  accepts the request, the HiCall apps in the mobile phone M 1  and the mobile phone M 2  separately send, to the service transmission components in the mobile phone M 1  and the mobile phone M 2 , a request for establishing a screen sharing streaming media transfer channel, so that the service transmission component establishes the screen sharing streaming media transfer channel. The HiCall app sends a screen streaming media data processing request to the media component, and the media component encapsulates and parses the screen streaming media data. The media component sends the encapsulated screen streaming media data to the screen sharing streaming media transfer channel, and the screen sharing streaming media transfer channel sends the encapsulated screen streaming media data to the peer mobile phone of the video call. The media component receives the screen streaming media data of the peer mobile phone that is sent by the screen sharing streaming media transfer channel, parses the screen streaming media data, and sends the parsed screen streaming media data to the InCallUI app. The InCallUI app displays a screen shared interface of the peer mobile phone based on the screen streaming media data. 
     Further, on the basis of establishing the screen sharing, processing such as remote assistance, doodle, and operation mapping may be further performed. The service transmission component may be further configured to establish a remote assistance operation signaling channel, a doodle signaling channel, an operation mapping signaling channel, and the like based on the request sent by the HiCall app. 
     Further, the system service is further configured to capture a user operation, perform screen splitting processing and multi-screen selection processing, and receive a trigger operation such as operation mapping of the user. The AMS, WMS, and VIEW system services capture user operations, calculate an operation area, and convert the operation and operation area into corresponding codes. 
     An embodiment of this application provides an enhanced video call method used in the foregoing communications system. The following specifically describes a scenario in which the enhanced video call method is applied. 
     A scenario in which a video call is established between the mobile phone M 1  and the mobile phone M 2 : 
     As shown in  FIG.  4 A- 1    and  FIG.  4 A- 2   , that the video call between the mobile phone M 1  and the mobile phone M 2  is established includes the following steps. 
     S 101 : The mobile phone M 1  detects a trigger operation of initiating a video call by the user N 1 . 
     In some embodiments, both the mobile phone M 1  and the mobile phone M 2  have only one physical screen, their respective home desktops (as shown in  FIG.  5 A ) are displayed on the screens, and a HiCall app is displayed on the home desktop. Then, the user N 1  taps the HiCall app on the mobile phone M 1 , the mobile phone M 1  starts the HiCall app, and then the user selects “User N 2 ” from a plurality of contacts to enter a communication interface with “User N 2 ”. A communications interface on the mobile phone M 1  is shown in  FIG.  5 B . Function controls used for more communication between the user N 1  and the user N 2  are displayed on the interface, and the function controls include “Video call”, “Phone”, and “SMS message” controls. Further, the name “User N 2 ” of the user N 2  is further displayed on the interface. 
     The user taps the video call control to initiate a video call. 
     S 102 : The mobile phone M 1  establishes a first connection channel with the server H. 
     The mobile phone M 1  detects a trigger operation of initiating a video call by the user, and sends, to the server H based on the trigger operation, a request for establishing a connection channel, where the request includes identity information of the mobile phone M 1 . For example, the identity information includes device information such as a user ID (a mobile phone number), a device ID (an IMEI number or the like), and a device type. 
     After receiving the request, the server H performs verification on the mobile phone M 1  based on the request. That the server H performs verification on the mobile phone M 1  includes that the server H verifies, based on device information recorded on a server H side, device information provided by the mobile phone M 1 , such as the user ID, the device ID, and the device type. 
     If the verification succeeds, the server H sends a response to the mobile phone M 1 . After receiving the response, the mobile phone M 1  completes establishment of the first connection channel with the server H. The response includes a unique communication channel identifier token (token) ID generated by the server H based on the user ID, the device ID, and the communication network information of the mobile phone M 1 , and a device communication ID (that is, a session (time domain) ID) generated by calculation based on the user ID, the device ID, and the communication token ID, so as to return an authentication status and the device communication ID to the terminal side device. 
     S 103 : The mobile phone M 1  sends a first video call request to the server H. 
     The mobile phone M 1  sends the first video call request to the server H through the first connection channel. The first video call request includes identification information of the mobile phone M 2 , for example, a user ID (mobile phone number) of the mobile phone M 2 , and further includes a service identifier requested by the mobile phone M 1 , for example, a video call service identifier. The service identifier is transmitted to the peer mobile phone M 2  as data information. 
     S 104 : After receiving the first video call request, the server H authenticates, for the mobile phone M 1  based on the first video call request, whether the mobile phone M 1  has permission to establish a video call through the server H. If the authentication succeeds, step S 105  is performed. 
     That after receiving the first video call request, the server H authenticates the mobile phone M 1  based on the first video call request to determine whether the mobile phone M 1  is allowed to establish a video call includes: The server H authenticates the mobile phone M 1  based on a device communication ID of the mobile phone M 2  in the first video call request to determine whether the communication ID is consistent with a record on the server H side, and parses the device communication ID to obtain a token ID (the token ID is a unique communication channel identifier generated by the server side and used to identify a corresponding communication channel), so as to find the communication channel corresponding to the server side. Meanwhile, the server H compares the identification information of the mobile phone M 2  (that is, the user ID (the mobile phone number) of the mobile phone M 2 ) in the video communication request sent by the device M 1  with a logged-in device information record at the server H end, and determines whether the mobile phone M 2  is a communicable device. If the mobile phone M 2  is the communicable device, the authentication succeeds. If the mobile phone M 2  is not the communicable device, the authentication fails. 
     S 105 : The server H feeds back authentication success information to the mobile phone M 1 . 
     The authentication success information may be the token ID of the mobile phone M 2  that is generated by the server H. 
     S 106 : The mobile phone M 1  sends a second video call request to the server H. 
     The mobile phone M 1  sends a second video call request to the server H through the first connection channel. The second video call request includes session (time domain) information, and the session information includes the token information used to identify the communication channel. The server H authenticates the second video call request by using the token. If the token is the token generated and sent by the server H, the authentication succeeds. After the authentication succeeds, S 107  is performed. 
     S 107 : The server H pushes the second video call request to the mobile phone M 2  by using a push server. The pushed information includes the user ID (the mobile phone number) of the mobile phone M 1  of the calling party and the like. 
     S 108 : The mobile phone M 2  detects a trigger operation that the user N 2  confirms to perform a video call. 
     For example, after the server H pushes the second video call request to the mobile phone M 2 , the mobile phone M 2  displays, on the screen of the mobile phone M 2  based on the second video call request, controls used by the user to choose whether to perform a video call with the user N 1 , for example, an “Accept” control and a “Hang up” control, and the user N 2  selects the “Accept” control. 
     S 109 : The mobile phone M 2  sends, based on the trigger operation of the user N 2  for confirming the video call, response information for receiving the video call request to the server H. 
     S 110 : After receiving the response information, the server H confirms that a second connection channel needs to be established with the mobile phone M 2 , and the second connection channel is established between the server H and the mobile phone M 2  and between the server H and the mobile phone M 2 . 
     S 111 : The server H authenticates the mobile phone M 2 . After the authentication succeeds, S 112  is performed. 
     That the server H authenticates the mobile phone M 2  includes: The server H authenticates the mobile phone M 2  by using the device communication ID of the mobile phone M 1  to determine whether the communication ID is consistent with the record on the server H side, and parses the device communication ID to obtain a token ID (the token ID is a unique communication channel identifier generated by the server side, and is used to identify a corresponding communication channel), so as to find the communication channel corresponding to the server H. Meanwhile, the server H compares the identification information of the mobile phone M 1  (that is, the user ID (the mobile phone number) of the device M 1 ) that is sent by the mobile phone M 2  with the logged-in device information record at the server H end, and determines whether the mobile phone M 1  is a communicable device. If the mobile phone M 1  is the communicable device, the authentication succeeds. If the mobile phone M 1  is not the communicable device, the authentication fails. 
     S 112 : The server H sends, to the mobile phone M 1 , information about accepting the video call request. 
     The server H sends, to the mobile phone M 1  through the second connection channel, the information about accepting the video call request. 
     S 113 : Establish a video call streaming media transfer channel between the mobile phone M 1  and the mobile phone M 2  by using the server H. 
     After the mobile phone M 1  receives the information that is sent by the server H and indicates acceptance of the video call request, the video call streaming media transfer channel is established between the mobile phone M 1  and the server H, and the video call streaming media transfer channel is established between the mobile phone M 2  and the server H. 
     S 114 : After the video call streaming media transfer channel is established, the mobile phone M 1  and the mobile phone M 2  perform a video call through the server H. 
     An interface after the video call is established between the mobile phone M 1  and the mobile phone M 2  may be shown in  FIG.  5 C . The mobile phone M 1  displays a video call image (for example, a video call image shown by a male avatar) of the user N 2 , and displays a video call image (for example, a video call image shown by a female avatar) of the user N 1 . In addition, the mobile phone M 1  displays “Remote assistance”, “Bidirectional screen sharing”, and “Hang up” controls. Similarly, the mobile phone M 2  displays the video call image of the user N 1  and displays the video call image of the user N 2 , and the mobile phone M 2  simultaneously displays “Remote assistance”, “Bidirectional screen sharing”, and “Hang up” controls. 
     A scenario in which remote assistance is performed between the mobile phone M 1  and the mobile phone M 2 : 
     Further, when the video call is performed between the mobile phone M 1  and the mobile phone M 2 , the user may select to perform remote assistance by using the “Remote assistance” control on the interface shown in  FIG.  5 C . 
     Refer to  FIG.  4 A- 1    and  FIG.  4 A- 2   . In an implementation, a process of performing remote assistance includes the following steps. 
     S 201 : The mobile phone M 1  detects a trigger operation of tapping the “Remote assistance” control by the user N 1 . 
     S 202 : The mobile phone M 1  sends a remote assistance request to the mobile phone M 2  by using the server H. 
     The remote assistance request is sent from the mobile phone M 1  to the mobile phone M 2  by using the first connection channel and the second connection channel. 
     S 203 : The mobile phone M 2  detects that the user N 2  confirms to perform a trigger operation of remote assistance. 
     S 204 : The mobile phone M 2  performs the trigger operation of remote assistance based on the confirmation of the user N 2 , and generates and sends, to the mobile phone M 1 , response information for confirming to perform the remote assistance. 
     The response information is sent from the mobile phone M 2  to the mobile phone M 1  by using the first connection channel and the second connection channel. 
     S 205 : After receiving the response information, the mobile phone M 1  establishes a screen sharing streaming media transfer channel with the mobile phone M 2 . 
     S 206 : The mobile phone M 1  displays a split-screen bar (shown by a dashed line in  FIG.  5 D- 1   ), and displays a screen A 1  and a screen A 2  that are located on two sides of the split-screen bar, where the screen A 1  displays a video call interface, the screen A 2  displays a main desktop interface of the mobile phone M 1  by default, and the mobile phone M 1  displays a side tool bar on a right side of the screen A 2 . The mobile phone M 2  displays the split-screen bar (shown by a dashed line in  FIG.  5 D- 2   ), and displays a screen B 1  and a screen B 2  that are located on two sides of the split-screen bar. The screen B 1  displays a video call interface, and the screen B 2  displays a main desktop interface of the mobile phone M 2  by default. In addition, the mobile phone M 2  displays a side tool bar on a right side of the screen B 2 . 
     Further, the user may further manually drag the split-screen bar to move leftwards or rightwards, so as to adjust sizes of the screens located on the two sides of the split-screen bar. 
     It should be noted that, the main desktop interface of the mobile phone M 1  is an interface initially displayed after the mobile phone M 1  shown in the interface A 2  in  FIG.  5 D- 1    is powered on and after the user wakes up the mobile phone M 1 . The main desktop of the mobile phone M 2  is an interface initially displayed after the mobile phone M 2  is powered on and after the user wakes up the mobile phone M 2 . 
     In addition, the screen A 2  and the screen B 2  may also display, by default, an initial display interface or another interface after the user of the HiCall app logs in. This may be selected based on a requirement. 
     Further, side tool bars that can be hidden and that are shown in  FIG.  5 D- 1    and  FIG.  5 D- 2    are displayed on edge sides of the mobile phone M 1  and the mobile phone M 2 . The side tool bar may be hidden to a side of the screen in a folded state based on a trigger operation such as sliding rightward of the user, or may be displayed on the screen in an unfolded state based on a trigger operation such as sliding leftward of the user. In addition, the side tool bar on the mobile phone M 1  is located on the right side of the screen A 2 , and the side tool bar on the mobile phone M 2  is located on the right side of the screen B 2 . 
     When the side tool bar is in the unfolded state, five controls “Video call”, “Remote assistance”, “Bidirectional screen sharing”, “Doodle”, and “Operation mapping” that can be triggered are sequentially displayed in a column, so that the user selects a corresponding communication type. Certainly, the side tool bar may display only some of the foregoing controls, or display more other controls. In addition, the controls in the side tool bar may be sequentially displayed in columns, or may be sequentially displayed in rows, or may be displayed in another manner. This is not limited in this application. 
     It should be noted that, in this embodiment of this application, for ease of displaying content on the screen, an example in which the side tool bar on the screen is in the folded state is used for description, and an example of the unfolded state of the side tool bar is marked on the outside of the screen. It should be understood that, in an actual operation process of selecting a communication type by using the side tool bar, the side tool bar is displayed on the screen of the mobile phone in the unfolded state when the user slides left. 
     It should be noted that a form of the side tool bar may be set based on a requirement. 
     S 207 : The mobile phone M 1  shares the screen streaming media data of the screen A 2  to the screen B 2  of the mobile phone M 2  for displaying by using the screen sharing streaming media transfer channel. 
     The mobile phone M 1  performs screen recording on the screen A 2 , and transmits screen streaming media data of the screen A 2  obtained after the screen recording to the mobile phone M 2  by using the screen sharing streaming media transfer channel. The mobile phone M 2  displays, on the screen B 2 , a display picture corresponding to the screen A 1  based on the screen streaming media data, so as to share the screen A 1  to the screen B 2 , and enable the user N 2  to implement remote assistance for the mobile phone M 1  by using the screen B 2 . 
     After the mobile phone M 1  shares the screen A 2  to the screen B 2  of the mobile phone M 2  for displaying by using the screen sharing streaming media transfer channel, for example, display interfaces of the mobile phone M 1  and the mobile phone M 2  may be shown in  FIG.  5 D- 1    and  FIG.  5 D- 2   , where the screen A 1  displays the video call images of the user N 1  and the user N 2 , the screen B 1  displays the video call images of the user N 1  and the user N 2 , the screen A 2  may display the main desktop interface of the mobile phone M 1  after the screen A 2  be split on the mobile phone M 1 , and the screen B 2  correspondingly displays the main desktop interface of the screen A 2  of the mobile phone M 1 . 
     In addition, it should be noted that the screen A 1  may further display, based on the trigger operation of the user N 1 , an interface corresponding to the trigger operation of the user N 1 , for example, zoom out a video call image, and display a display interface such as a home screen. Display of the screen A 1  and display of the screen A 2  are independent. In some embodiments, an operation performed by the user on the screen A 1  does not affect display of the screen A 2 . In some embodiments, an operation performed by the user N 1  on the screen A 1  may also affect display of the screen A 2 . In addition, similarly, the screen B 1  may display, based on the trigger operation of the user N 2 , an interface corresponding to the trigger operation of the user N 2 , for example, opening an application. 
     Further, after the mobile phone M 1  shares the screen A 2  to the screen B 2  of the mobile phone M 2  for displaying by using the screen sharing streaming media transfer channel, the user N 2  may implement remote assistance for the mobile phone M 1  by operating the screen B 2 . It should be noted that, in response to the remote assistance performed by the user N 2  on the mobile phone M 1  by using the mobile phone M 2 , the mobile phone M 1  further displays, on the screen A 2  of the mobile phone M 1 , an interface corresponding to the remote assistance operation. 
     A remote assistance signaling channel is further established between the mobile phone M 1  and the mobile phone M 2 . The mobile phone M 2  sends remote assistance signaling including operation information for performing remote assistance on the mobile phone M 1  and an operated control to the mobile phone M 1  through the remote assistance signaling channel, so that the mobile phone M 1  performs a corresponding operation based on the remote assistance signaling, thereby implementing remote assistance of the mobile phone M 2  for the mobile phone M 1 , for example, performing a remote assistance operation such as application uninstallation shown in  FIG.  5 E . 
     In addition, that the remote auxiliary signaling channel is established between the mobile phone M 1  and the mobile phone M 2  may be that the remote auxiliary signaling channel is established after the mobile phone M 1  receives the foregoing response information. 
     It should be noted that, the remote assistance performed between the mobile phone M 1  and the mobile phone M 2  is performed on the basis of establishing unidirectional screen sharing between the mobile phone M 1  and the mobile phone M 2 . In addition, when the mobile phone M 2  does not perform remote assistance on the mobile phone M 1 , the mobile phone M 1  and the mobile phone M 2  perform an operation of sharing the screen A 2  to the mobile phone M 2  for displaying. When the mobile phone M 2  performs remote assistance on the mobile phone M 1 , the mobile phone M 1  and the mobile phone M 2  stop the operation of sharing the screen A 2  to the mobile phone M 2  for displaying, and perform an operation of performing remote assistance on the mobile phone M 1  by the mobile phone M 2 . 
     When the user N 2  does not perform an operation on the screen B 2 , the user N 1  may further perform an operation on the screen A 2 . The screen A 2  displays an interface in response to the operation of the user N 1 . The mobile phone M 1  performs screen recording on the screen A 2 , and shares data obtained after the screen recording to the screen B 2  of the mobile phone M 2  for displaying by using the foregoing screen sharing streaming media transfer channel. 
     S 208 : The mobile phone M 1  detects a trigger operation of terminating remote assistance by the user N 1 . 
     S 209 : The mobile phone M 1  sends remote assistance termination signaling to the mobile phone M 2  based on the trigger operation of terminating the remote assistance by the user N 1 . After receiving the information, the mobile phone M 2  terminates the remote assistance operation. 
     It should be noted that, the user N 1  may perform a trigger operation of terminating remote assistance by tapping the “Remote assistance” operation control again to terminate the remote assistance operation, or by tapping the “Video call” operation control to switch to a video call only to terminate the remote assistance operation, or tapping a “Stop” control (not shown in the figure) displayed in the side tool bar to terminate the remote assistance operation. This may be selected and set as required. Certainly, the user N 2  may also trigger the remote assistance control for terminating remote assistance on the mobile phone M 2  to end the “Remote assistance” operation. 
     After the remote assistance between the mobile phone M 1  and the mobile phone M 2  is terminated, the screens of the mobile phone M 1  and the mobile phone M 2  may enter a corresponding interface based on a user operation, for example, may display interfaces shown in  FIG.  5 C , or display unidirectional screen shared interfaces shown in  FIG.  5 D- 1    and  FIG.  5 D- 2   . This may be set based on a requirement. 
     According to the enhanced video call method provided in this embodiment of this application, a video call and screen sharing may be simultaneously performed between the mobile phone M 1  and the mobile phone M 2  by using one application. The video call streaming media transfer channel is established between the mobile phone M 1  and the mobile phone M 2  to perform the video call, and the screen sharing streaming media transfer channel that is independent of the video call streaming media transfer channel is established for screen sharing. In addition, the mobile phone M 1  and the mobile phone M 2  split a screen into two screens by using a screen splitting technology, so that the mobile phone M 1  and the mobile phone M 2  can display the screen used for remote assistance while displaying the video call interface, and the mobile phone M 2  can perform remote assistance on the mobile phone M 1 . 
     However, in the conventional technology, currently, a video call is performed between the mobile phone M 1  and the mobile phone M 2  through an application, and screen sharing needs to be performed between the mobile phone M 1  and the mobile phone M 2  through another application. In other words, the mobile phone M 1  and the mobile phone M 2  cannot simultaneously perform a video call and screen sharing through one application. In addition, current screen sharing supports only unidirectional screen sharing. In other words, the mobile phone M 1 , as a screen sharing party, unidirectionally shares the screen of the mobile phone M 1  to the mobile phone M 2  for displaying. During screen sharing, the mobile phone M 1  shares the entire screen of the mobile phone M 1  as a whole to the mobile phone M 2  for displaying, so that when the user N 2  performs an operation on the shared screen of the mobile phone M 1  that is displayed on the screen of the mobile phone M 2 , the screen of the mobile phone M 1  can only be operated by the user by using the mobile phone M 2  or selected by the user N 1  to terminate the remote assistance, and the user N 1  cannot perform another operation on the screen of the mobile phone M 1  at the same time. 
     It should be noted that, in this embodiment of this application, remote communication may be established between the mobile phone M 1  and the mobile phone M 2  to perform the foregoing remote assistance, or short-distance communication may be established between the mobile phone M 1  and the mobile phone M 2  to perform short-distance assistance. This may be selected based on a requirement. The short-distance communication may refer to short-distance communication such as Wi-Fi and Bluetooth. 
     A scenario in which doodle is performed between the mobile phone M 1  and the mobile phone M 2 . 
     Further, when remote assistance is performed between the mobile phone M 1  and the mobile phone M 2 , for example, on an interface shown in  FIG.  5 E , the user may further trigger a “Doodle” control on the screen of the mobile phone M 1 , so that the mobile phone M 1  and the mobile phone M 2  switch to doodle. 
     Refer to  FIG.  4 B- 1    and  FIG.  4 B- 2   . In an implementation of this embodiment of this application, the mobile phone M 1  serves as a remote assistance requesting party, and the mobile phone M 2  serves as a remote assistance assisting party. If a doodle initiator is the mobile phone M 1 , the mobile phone M 1  allows the user N 1  to doodle on the screen A 2  by default, and a doodle process includes the following steps. 
     S 301 : The mobile phone M 1  detects a trigger operation that the user N 1  triggers a “Doodle” control displayed on the screen of the mobile phone M 1 . 
     For example, the user N 1  triggers, on the interface shown in  FIG.  5 E , the “Doodle” control on the screen of the mobile phone M 1 . 
     S 302 : The mobile phone M 1  detects a doodle operation of the user N 1  on the screen A 2 , and displays a doodle on the screen A 2 , where the doodle is, for example, a circle displayed on the screen A 2  shown in  FIG.  5 F . 
     S 303 : The mobile phone M 1  sends screen recording data of the doodle operation of the user N 1  to the mobile phone M 2 . 
     The mobile phone M 1  sends the screen recording data to the mobile phone M 2  by using the foregoing screen sharing streaming media transfer channel, and the screen recording data includes doodle data. 
     S 304 : The mobile phone M 2  receives the screen recording data, and implements screen sharing on the screen B 2  based on the screen recording data, so as to display a doodle, where the doodle is, for example, a circle displayed on the screen B 2  shown in  FIG.  5 F . 
     It should be noted that, in this embodiment of this application, the doodle may be a trace such as a painting or a marking that is generated by a “Paint” tool corresponding to the “Doodle” control based on a trigger operation of the user, so as to achieve an objective of the user, such as painting or marking. 
     For example, in a scenario shown in  FIG.  5 E , the user N 1  may select the “Doodle” control, and then the user N 1  doodles around a position of an offloading icon on the screen A 2  of the mobile phone M 1  shown in  FIG.  5 F . The doodle may be, for example, a circle. Then the mobile phone M 1  shares the screen A 2  to the screen B 2  of the mobile phone M 2  for displaying, and forms the doodle around the position of the offloading icon on the screen B 2  of the mobile phone M 2 . After doodle screen sharing is completed, display interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  5 F . 
     S 305 : After a preset time, the doodle automatically disappears. 
     The preset time may be 3 s. That is, after the user N 1  completes the doodle, the doodle is displayed on the screen A 2  for 3 s, and then the doodle automatically disappears. The preset time may be set based on a requirement. This is not limited in this embodiment of this application. 
     S 306 : The mobile phone M 1  performs screen recording on the screen A 2  to obtain screen recording data. 
     S 307 : The mobile phone M 1  sends the screen recording data to the mobile phone M 2 . 
     S 308 : The mobile phone M 2  receives the screen recording data, implements screen sharing based on the screen recording data, and performs display on the screen B 2  of the mobile phone M 2 , so that the doodle pattern on the screen B 2  disappears. 
     In a scenario shown in  FIG.  5 F , the doodle disappears on the screen A 2  of the mobile phone M 1 , and then the mobile phone M 1  shares the screen A 2  to the screen B 2  of the mobile phone M 2  for displaying, so that the doodle disappears on the screen B 2  of the mobile phone M 2 . After the doodle disappears, display interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  5 E . 
     It should be noted that, in some implementations, after the user taps the “Doodle” control, as shown in  FIG.  5 G , a pop-up window is further displayed on the interface to display a “Doodle auxiliary tool” control. When the user triggers the “Doodle auxiliary tool” control, controls such as an eraser and a modify pen may be further displayed. The user uses the controls such as the eraser and the modify pen to further erase and modify the doodle. In addition, the “Doodle auxiliary tool” may further include a control used to end a doodle operation, where the control is triggered by the user to end the doodle, and may be set based on a requirement. This is not limited in this application. 
     Another scenario in which doodle is performed between the mobile phone M 1  and the mobile phone M 2 . 
     Further, referring to  FIG.  4 B- 1    and  FIG.  4 B- 2   , in an implementation of this embodiment of this application, the mobile phone M 1  is a remote assistance requesting party, and the mobile phone M 2  is a remote assistance assisting party. If an initiator of the doodle operation is the mobile phone M 2 , the mobile phone M 2  and the mobile phone M 1  need to negotiate whether to allow the user N 2  to doodle on the screen B 2 . When determining to allow the user N 2  to doodle on the screen B 2 , the mobile phone M 2  receives the doodle of the user N 2  on the screen B 2 . The doodle process includes the following steps. 
     S 401 : The mobile phone M 2  detects a trigger operation that the user N 2  triggers the “Doodle” control in the side tool bar on the screen of the mobile phone M 2 . 
     S 402 : The mobile phone M 2  sends a doodle request to the mobile phone M 1  based on the trigger operation of the user N 2  on the “Doodle” control. 
     S 403 : The mobile phone M 1  detects that the user N 1  performs a trigger operation of confirming reception of the doodle request. 
     S 404 : The mobile phone M 1  freezes the screen A 2 , so that the screen A 2  cannot be operated by the user N 1 . 
     S 405 : The mobile phone M 1  sends response information for accepting the doodle to the mobile phone M 2 . 
     S 406 : After receiving the response information, the mobile phone M 2  starts detection of a doodle trigger operation performed by the user N 2 . 
     S 407 : The mobile phone M 2  detects that the user N 2  performs the doodle trigger operation, and the mobile phone M 2  displays, on the screen of the screen B 2  based on the doodle of the user N 2 , the doodle on the interface B 2  shown in  FIG.  5 F . 
     S 408 : The mobile phone M 2  sends the screen recording data to the mobile phone M 1 . 
     The mobile phone M 2  sends, to the mobile phone M 1 , screen recording data that includes doodle data and that is obtained after screen recording is performed on the screen B 2 . The mobile phone M 1  receives the screen recording data, and performs display based on the screen recording data. 
     For example, in a scenario shown in  FIG.  5 E , the user N 2  may select the “Doodle” control. Then, the user N 2  doodles around the position of the uninstallation icon on the screen B 2  of the mobile phone M 2  shown in  FIG.  5 F , and forms the doodle around the position of the uninstallation icon on the screen A 2  of the mobile phone M 1 . After doodle screen sharing is completed, display interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  5 F . 
     S 409 : After a preset time, the doodle disappears. 
     The preset time may be 3 s, and may be set based on a requirement. This is not limited in this embodiment of this application. 
     S 410 : The mobile phone M 2  sends doodle cancellation information to the mobile phone M 1 . 
     The mobile phone M 2  sends the doodle cancellation information to the mobile phone M 1  through a doodle signaling channel between the mobile phone M 2  and the mobile phone M 1 , where the doodle signaling channel may be established between the mobile phone M 1  and the mobile phone M 2  after the mobile phone M 1  sends the response information for accepting the doodle to the mobile phone M 2 . 
     S 411 : After receiving the doodle cancellation information, the mobile phone M 1  cancels screen freezing processing on the screen A 2 , so that the screen A 2  can be operated by the user N 1 . 
     S 412 : The mobile phone M 1  starts screen recording. 
     S 413 : The mobile phone M 1  performs a screen sharing operation. 
     In a scenario shown in  FIG.  5 F , after the doodle on the screen B 2  of the mobile phone M 2  disappears, the doodle displayed on the screen A 2  of the mobile phone M 1  also disappears. After the doodle disappears, display interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  5 E . 
     That is, according to the enhanced video call method provided in this embodiment of this application, doodle can be further implemented while remote assistance is performed. In addition, if the user N 1  performs doodle on the screen A 2 , the mobile phone M 1  may directly share the shared screen including the doodle to the screen B 2  of the mobile phone M 2  for displaying. If the user N 2  performs doodle on the screen B 2 , the mobile phone M 1  and the mobile phone M 2  further need to negotiate, and the mobile phone M 1  needs to freeze the screen A 2 . After the mobile phone M 2  receives the doodle, screen recording is performed on the screen B 2 , and the doodle is mapped to the screen A 2  of the mobile phone M 1  for displaying. 
     A scenario of bidirectional screen sharing between the mobile phone M 1  and the mobile phone M 2  is as follows. 
     Further, during a video call between the mobile phone M 1  and the mobile phone M 2 , the user may further select the “Bidirectional screen sharing” control on the interface shown in  FIG.  5 C , so that bidirectional screen sharing is performed between the mobile phone M 1  and the mobile phone M 2 . 
     Refer to  FIG.  4 C- 1    and  FIG.  4 C- 2   . A process of performing bidirectional screen sharing between the mobile phone M 1  and the mobile phone M 2  may include the following steps. 
     S 501 : The mobile phone M 1  detects that the user N 1  performs a trigger operation of initiating bidirectional screen sharing. 
     S 502 : The mobile phone M 1  sends a bidirectional screen sharing request to the mobile phone M 2  by using the server H based on the trigger operation of bidirectional screen sharing of the user N 1 . 
     S 503 : The mobile phone M 2  detects that the user N 2  performs a trigger operation of confirming bidirectional screen sharing. 
     S 504 : The mobile phone M 2  performs, based on the confirmation of the user N 2 , the trigger operation for bidirectional screen sharing, generates and sends, to the mobile phone M 1 , response information for confirming to perform bidirectional screen sharing. 
     S 505 : After receiving the response information, the mobile phone M 1  establishes a first screen sharing streaming media transfer channel and a second screen sharing streaming media transfer channel with the mobile phone M 2 . 
     S 506 : The mobile phone M 1  displays a split-screen bar (shown by a dashed line in  FIG.  5 H- 1   ), and displays a screen A 1  and a screen A 2  that are located on two sides of the split-screen bar, where the screen A 1  displays a video call interface (an image of the other party during a video call) and an operable interface of the mobile phone M 1  (for example, a main desktop of the mobile phone M 1 ), and the screen A 2  displays a shared interface shared by the mobile phone M 2  (for example, a main desktop of the mobile phone M 2 ). In addition, the mobile phone M 1  displays a side tool bar on a right side of the screen A 2 . The mobile phone M 2  displays the split-screen bar (shown by the dashed line in  FIG.  5 H- 2   ), and displays a screen B 1  and a screen B 2  that are located on two sides of the split-screen bar, where the screen B 1  displays a video call interface (an image of the other party during the video call) and an operable interface of the mobile phone M 2  (for example, a main desktop of the mobile phone M 2 ), and the screen B 2  displays a shared interface shared by the mobile phone M 1  (for example, the main desktop of the mobile phone M 1 ). In addition, the mobile phone M 2  displays a side tool bar on a right side of the screen B 2 . 
     S 507 : The mobile phone M 1  shares the screen A 1  to the screen B 2  of the mobile phone M 2  for displaying, and the mobile phone M 2  shares the screen B 1  to the screen A 2  of the mobile phone M 1  for displaying. 
     For example, for the scenario shown in  FIG.  5 C , the mobile phone M 1  and the mobile phone M 2  are in a video call state, the user N 1  taps a “Bidirectional screen sharing” control, and the user N 2  receives “Bidirectional screen sharing”. After “Bidirectional screen sharing” is established, the interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  5 H- 1    and  FIG.  5 H- 2   . The screen A 1  is a screen that is of the mobile phone M 1  and that is used by a user to perform an operation. An operable interface (for example, a desktop) of the mobile phone M 1  and an image of the other party during a video call may be displayed on the screen A 1 . The screen B 1  is a screen that is of the mobile phone M 2  and that is used by a user to perform an operation. An operable interface (for example, a desktop) of the mobile phone M 2  and an image of the other party during a video call may be displayed on the screen B 1 . 
     It should be noted that the first screen sharing streaming media transfer channel is used to transmit display data, doodle data, and the like that are related to the screen A 1  and the screen B 2 , and the second screen sharing streaming media transfer channel is used to transmit display data, doodle data, and the like that are related to the screen A 2  and the screen B 1 . 
     Another scenario of bidirectional screen sharing between the mobile phone M 1  and the mobile phone M 2  is as follows. 
     Further, for example, as shown in  FIG.  5 D- 1    and  FIG.  5 D- 2   , when remote assistance is established between the mobile phone M 1  and the mobile phone M 2 , the user may further select “Bidirectional screen sharing” based on the side tool bar, so that bidirectional screen sharing is established between the mobile phone M 1  and the mobile phone M 2 . It should be noted that, in this case, compared with that the first screen sharing streaming media transfer channel and the second screen sharing streaming media transfer channel need to be established between the mobile phone M 1  and the mobile phone M 2  in S 505 , the two screen sharing streaming media transfer channels can be established as long as another screen sharing streaming media transfer channel is established between the mobile phone M 1  and the mobile phone M 2 . The screen sharing streaming media transfer channel established in S 205  is the first screen sharing streaming media transfer channel, the another screen sharing streaming media transfer channel is a second screen sharing streaming media transfer channel. Other processes of performing bidirectional screen sharing are the same as or similar to the foregoing steps S 501  to S 507 . Details are not described herein again. 
     According to the enhanced video call method provided in this embodiment of this application, bidirectional screen sharing between the mobile phone M 1  and the mobile phone M 2  can be implemented, so that the mobile phone M 1  and the mobile phone M 2  each have a screen used by a user. In addition, the screen used by the user may be used as a shared screen and shared to a peer end for displaying, and a screen that is of the peer end and that is used by the user is displayed, thereby implementing bidirectional screen sharing and effectively improving user experience. 
     Further, when bidirectional screen sharing is performed between the mobile phone M 1  and the mobile phone M 2 , the users may further select to doodle based on the side tool bars shown in  FIG.  5 H- 1    and  FIG.  5 H- 2   . If the mobile phone M 1  detects an operation of the user N 1  on a doodle control, as shown in  FIG.  5 I- 1   , the mobile phone M 1  displays, in a pop-up window, a control of a doodle screen that is used by the user to select to perform a doodle operation. If the user selects a screen A 1 , the mobile phone M 1  agrees the user N 1  to doodle on the screen A 1  by default, and the mobile phones M 1  and M 2  perform a doodle process shown in steps S 301  to S 308 . For example, interfaces after doodle is performed are shown in  FIG.  5 J- 1    and  FIG.  5 J- 2   . 
     If the user selects the screen A 2 , the mobile phone M 1  and the mobile phone M 2  need to negotiate whether the user N 1  is allowed to doodle on the screen A 2 . When determining that the user N 1  is allowed to doodle on the screen A 2 , the mobile phone M 1  receives the doodle on the screen A 2  from the user N 1 . In addition, the mobile phones M 1  and M 2  perform processes similar to those shown in steps S 401  to S 413 . For example, interfaces after doodle is performed are shown in  FIG.  5 K- 1    and  FIG.  5 K- 2   . 
     In an implementation of this embodiment of this application, when the mobile phone M 1  and the mobile phone M 2  perform bidirectional screen sharing, the user may further select an “Operation mapping” control based on the tool bar, and the mobile phone M 1  and the mobile phone M 2  perform an operation related to operation mapping. Refer to  FIG.  4 C- 1    and  FIG.  4 C- 2   . Performing operation mapping includes the following steps. 
     5801: The mobile phone M 1  detects a trigger operation performed by the user N 1  on an “Operation mapping” control. 
     For example, in this embodiment of this application, an application uninstallation scenario is used as an example for description. During application uninstallation, display interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  5 L . 
     5802: The mobile phone M 1  sends an operation mapping request to the mobile phone M 2  by using the server H based on a trigger operation of the user N 1  on the “Operation mapping” control. 
     5803: The mobile phone M 2  detects confirmation of the user N 2  that a trigger operation of operation mapping is to be performed. 
     5804: The mobile phone M 2  performs the trigger operation of the operation mapping based on the confirmation of the user N 2 , and generates and sends, to the mobile phone M 1 , response information for confirming to perform the operation mapping. 
     5805: The mobile phone M 1  establishes an operation mapping signaling channel with the mobile phone M 2 . 
     S 806 : The mobile phone M 2  receives a trigger operation performed by the user N 2  on the screen BT. 
     S 807 : The mobile phone M 2  generates operation mapping signaling based on the trigger operation performed by the user N 2  on the screen BT. S 809  is performed at the same time. 
     The mobile phone M 2  captures the trigger operation of the user N 2 , calculates an operation area of the user N 2 , converts the operation and the operation area into a corresponding code, and generates operation mapping signaling, where the operation mapping signaling includes a mapping mark code, an operation field, an operation object, and an operation code. The mapping mark code is used to identify that a signaling type is operation mapping, the operation field is an operation area recorded based on a screen scale, the operation object is an operated control object identifier and is defined by a system, and the operation code is used to identify an operation behavior such as tap, pull-down, slide-up, or irregular slide. 
     S 808 : The mobile phone M 2  sends the operation mapping signaling to the mobile phone M 1  through the operation mapping signaling channel. 
     S 809 : The mobile phone M 2  receives the trigger operation performed by the user N 2  on the screen B 1 , and continuously performs screen recording, to obtain screen recording data. 
     As shown in  FIG.  5 M , the user N 2  performs a tap trigger operation on an uninstallation icon on the screen B 1 . 
     S 810 : The mobile phone M 2  sends screen recording data of the second screen B 2  to the mobile phone M 1 . 
     S 811 : The mobile phone M 1  receives the operation mapping signaling, and parses the operation mapping signaling. 
     S 812 : The mobile phone M 1  displays an operation mapping interface based on a parsing result. 
     The mobile phone M 1  receives the operation mapping signaling output by the mobile phone M 2 . First, the mobile phone M 1  determines that the received signaling is the operation mapping signaling, and then determines, based on a displayed screen, whether an operation area (for example, an area of an unloading control triggered by a finger of the user N 2  and an area around the unloading control) in the operation mapping signaling and an operation object (for example, the unloading control) in which the user N 2  performs an operation exist, and the operation object can perform an operation behavior corresponding to an operation code in the signaling. When the foregoing condition is met, the mobile phone M 1  displays an operation mapping prompt based on the information such as the operation area, the control object, and the operation. For example, the operation prompt is marked with a frame line on the screen A 1  of the mobile phone M 1 . 
     Further, a display interface obtained after operation mapping is performed is shown in  FIG.  5 N . 
     S 813 : The mobile phone M 1  detects the trigger operation performed by the user N 1  based on the operation mapping. 
     As shown in  FIG.  5 O , the user N 1  performs a trigger operation on a screen A 1 . 
     S 814 : The mobile phone M 1  displays, based on the trigger operation of the user N 1 , an interface corresponding to the trigger operation. 
     The mobile phone M 1  obtains the operation prompt based on the operation prompt marked on the screen A 1  and an operation mark displayed on the screen A 2 , thereby achieving an effect of guiding the user N 1  to perform a self-learning operation by using the mobile phone M 1 . 
     S 815 : The mobile phone M 1  generates response information indicating that the trigger operation is completed, and sends the response information to the mobile phone M 2  through the operation mapping signaling channel. 
     S 816 : The mobile phone M 2  generates prompt information based on the response information, and displays the prompt information on the screen B 1 . 
     The prompt information may be transmitted in a toast (prompt box) information manner. 
     After the mobile phone M 1  performs an operation based on the operation mapping prompt, the mobile phone M 1  detects an operation behavior of the user N 1 , and feeds back a mapping learning result to the mobile phone M 2 . The mobile phone M 2  notifies the user that the peer end has completed learning through the toast and the user can proceed with subsequent operations. 
     It should be noted that, for ease of description, in the foregoing process, the process of transmitting each piece of information between the mobile phone M 1  and the server H through the push server P 1  and the process of transmitting each piece of information between the mobile phone M 2  and the general server H through the push server P 2  are omitted, but persons skilled in the art should understand that the information is transmitted through the push server. 
     Further, in an implementation of this application, during remote assistance, for step S 206 , the mobile phone M 1  and the mobile phone M 2  may also display an interface shown in  FIG.  5 P . To be specific, the mobile phone M 1  displays the video call image of the user N 2  in a lower right corner of the screen, and displays the main desktop at another area. The mobile phone M 2  displays the video call image of the user N 1  in a lower right corner of the screen, and displays the main desktop shared by the mobile phone M 1  at the another area. Certainly, when remote assistance is performed, for step S 206 , another type of display interface may also be used. 
     It should be noted that, that the mobile phone M 1  and the mobile phone M 1  divide respective screens of the mobile phone M 1  and the mobile phone M 1  into at least two display areas includes: If only one physical screen is disposed on each of the mobile phone M 1  and the mobile phone M 2 , the mobile phone M 1  and the mobile phone M 2  display a split-screen bar in a middle position of the respective screen to divide the screen into the two display areas. 
     Alternatively, if the mobile phone M 1  and the mobile phone M 2  include a plurality of physical screens, the mobile phone M 1  and the mobile phone M 2  select at least two screens from the plurality of screens. The mobile phone M 1  and the mobile phone M 2  may be multi-screen terminals, and may select two screens from the plurality of screens as a shared screen and a screen used to display the shared screen of the peer mobile phone. For example, as shown in  FIG.  6 A , the mobile phone M 1  and the mobile phone M 2  each include a left physical screen and a right physical screen, and the two screens are respectively used as the foregoing screen A 1  and screen A 2 , and the foregoing screen B 1  and screen B 2 . Further, in the foregoing screen sharing scenario, interfaces displayed on the two screens are the same as interfaces displayed after screen splitting. Details are not described herein again. 
     In addition, referring to  FIG.  6 B , in this embodiment of this application, screen shapes of the mobile phone M 1  and the mobile phone M 2  may alternatively be shown in  FIG.  6 B . During screen splitting, the screens are split into a state shown in  FIG.  6 C- 1    and  FIG.  6 C- 2   . 
     Further, in this embodiment of this application, the mobile phone M 1  is communicatively connected to an electronic device C, and the mobile phone M 1  shares, to the electronic device C for displaying, a video call interface for a video call with the mobile phone M 2 . Further, the mobile phone M 2  is communicatively connected to the electronic device D, and the mobile phone M 2  shares, to an electronic device D for displaying, a video call interface for a video call with the mobile phone M 1 . For example, corresponding to the display interfaces of the scenario shown in  FIG.  5 H- 1    and  FIG.  5 H- 2   , display interfaces of the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  6 D- 1    and  FIG.  6 D- 2   . In another scenario, similarly, the video call interface is shared to the electronic device C and the electronic device D for displaying. Details are not described herein again. 
     Further, in this application, as shown in  FIG.  6 E , the mobile phone M 1  and the electronic device C are in a communication connection, the mobile phone M 2  and the electronic device D are in a communication connection, and the mobile phone M 1  and the mobile phone M 2  establish a video call. When the foregoing remote assistance is performed, an operation of selecting a device of a sharing screen may be further performed. 
     As shown in  FIG.  6 E , if the mobile phone M 1  detects an operation performed by a user on a remote assistance control or a bidirectional screen sharing control, interfaces displayed by the mobile phone M 1  and the mobile phone M 2  are shown in  FIG.  6 F . A control used by the user N 1  to select a screen sharing device is displayed on a screen of the mobile phone M 1 . If the user N 1  selects the mobile phone M 1 , the mobile phone M 1  shares the screen of the mobile phone M 1  to the mobile phone M 2  for displaying. If the user N 1  selects the electronic device C, the mobile phone M 1  shares the screen of the electronic device C with the mobile phone M 2  for displaying. Further, the screen of the mobile phone M 2  displays a control used by the user N 2  to select a device for receiving screen sharing. If the user N 2  selects the mobile phone M 2 , the mobile phone M 2  displays the screen shared by the mobile phone M 1 . If the user N 2  selects the electronic device D, the mobile phone M 2  enables the electronic device D to display the screen shared by the mobile phone M 1 . 
     It should be noted that, in this embodiment of this application, a specific structure and shape of the screen are not limited, and the screen may be set based on a requirement. 
       FIG.  7    is a schematic diagram of another structure of an electronic device  900  according to an implementation of an embodiment of this application. The electronic device  900  may include one or more processors  901  coupled to a controller hub  904 . In at least one embodiment, the controller hub  904  communicates with the processor  901  through a multi-branch bus such as a front side bus (FSB), a point-to-point interface such as a quick path interconnect (QPI), or a similar connection. The processor  901  executes instructions for controlling a general type of data processing operation. In an embodiment, the controller hub  904  includes, but is not limited to, a graphics memory controller hub (GMCH) (not shown in the figure) and an input/output hub (IOH) (which may be on separate chips) (not shown in the figure). The GMCH includes a memory and a graphics controller, and is coupled to the IOH. 
     The electronic device  900  may further include a coprocessor  906  and a memory  902  that are coupled to the controller hub  904 . Alternatively, one or both of the memory  902  and the GMCH may be integrated into the processor  901  (as described in the embodiment of this application). The memory  902  and the coprocessor  906  are directly coupled to the processor  901  and the controller hub  904 . The controller hub  904  and the IOH are located in a single chip. 
     In one embodiment, the coprocessor  906  is a dedicated processor, and an optional property of the coprocessor  906  is represented by dashed lines in  FIG.  7   . 
     In an embodiment, the electronic device  900  may further include a network interface (NIC)  903 . The network interface  903  may include a transceiver, configured to provide a radio interface for the electronic device  900  to further communicate with any other suitable devices (such as a front-end module and an antenna). In various embodiments, the network interface  903  may be integrated with another component of the electronic device  900 . The network interface  903  may implement a function of a communications unit in the foregoing embodiment. 
     The electronic device  900  may further include an input/output (I/O) device  905 . 
     It should be noted that  FIG.  7    is merely used as an example. To be specific, although  FIG.  7    shows that the electronic device  900  includes a plurality of components such as the processor  901 , the controller hub  904 , and the memory  902 , in actual application, a device using the methods in the embodiment of this application may include only some of the components of the electronic device  900 , for example, may include only the processor  901  and the NIC  903 . A property of an optional component in  FIG.  7    is shown by a dashed line. 
     The memory of the electronic device  900  may include one or more tangible and non-transitory computer-readable storage media, configured to store data and/or instructions. The computer-readable storage medium stores instructions, and specifically, stores temporary and permanent copies of the instructions. 
     In this embodiment of this application, the electronic device  900  may be a mobile phone, and the instructions stored in the memory of the electronic device may include: an instruction that is executed by at least one unit in the processor and that causes the mobile phone to implement the enhanced video call method mentioned above. 
     The embodiments of the mechanism disclosed in the embodiments of this application may be implemented in a manner such as software, hardware, firmware, or a combination of these implementation methods. The embodiments of this application may be implemented as a computer program or program code executed on a programmable system. The programmable program includes at least one processor and a memory (or a storage system, including volatile and non-volatile memories and/or a storage unit). 
     The program code may be applied to input the instructions to perform the functions described herein and generate output information. The output information may be applied to one or more output devices in a known manner. It may be understood that, in the embodiments of this application, a processing system may be a microprocessor, a digital signal processor (DSP), a microcontroller, an application-specific integrated circuit (ASIC), or the like, and/or any combination thereof. According to another aspect, the processor may be a single-core processor, a multi-core processor, or the like, and/or any combination thereof. 
     The program code may be implemented in a high-level programming language or an object-oriented programming language, to communicate with the processor. The program code may alternatively be implemented by using an assembly language or a machine language when needed. Indeed, the mechanisms described in this application are not limited to the scope of any particular programming language. In any case, the language may be a compiled language or an interpretive language. 
     In some cases, the disclosed embodiments may be implemented by hardware, firmware, software, or any other combinations. The disclosed embodiments may be implemented as instructions carried by or stored on one or more transitory or non-transitory machine-readable (for example, computer-readable) storage media. The instructions may be read and executed by one or more processors. For example, the instructions are distributed over a network or through a pneumatic computer-readable medium. Therefore, the machine-readable medium may include any mechanism for storing or transmitting information in a machine (for example, a computer) readable form, including, but not limited to, a floppy disk, a compact disc, an optical disc, a compact disc read-only memory (CD-ROMs), a magneto-optical disc, a read-only memory (ROM), a random access memory (RAM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic card or an optical card, a flash memory, or a tangible machine-readable memory for transmitting information (for example, a carrier-wave, infrared, and digital signal) by using the internet in an electrical, optical, acoustic, or other forms. Therefore, the machine-readable medium includes any type of machine-readable medium suitable for storing or transmitting electronic instructions or information in a machine-readable form.