CN111263206B - Synchronous playing method and device of multimedia information, storage medium and mobile terminal - Google Patents
Synchronous playing method and device of multimedia information, storage medium and mobile terminal Download PDFInfo
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- 230000001360 synchronised effect Effects 0.000 title claims description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 217
- 238000012360 testing method Methods 0.000 claims abstract description 132
- 238000001514 detection method Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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Abstract
The application discloses a method, a device, a storage medium and a mobile terminal for synchronously playing multimedia information, wherein the method comprises the following steps: transmitting a connection beacon frame; when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission time length of the transmission test frame sent to each playing device is determined; determining a transmission time stamp for transmitting the multimedia information to each playing device based on the transmission time length; and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information. And determining the transmission time lengths of different equipment by transmitting the test frame, and further determining the sending time stamp of the multimedia information sent to each playing equipment, so that the receiving time stamps of the multimedia information received by each playing equipment are the same.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method, an apparatus, a storage medium, and a mobile terminal for synchronously playing multimedia information.
Background
Wi-Fi (Wireless-Fidelity) communication technology is continuously upgraded and updated, a Wi-Fi router is installed in most families and public places, so that much convenience is brought to daily life of people, and people use Wi-Fi in homes, offices and markets to surf the internet, such as browsing news, online shopping, text and video chatting and the like. Applications that use Wi-Fi to share multimedia information such as video, music, etc. are also popular.
In the prior art, when a user shares video or audio files on the user's device to multiple people at the same time, sometimes the video pictures or audio sounds played on multiple devices receiving the audio/video files are not synchronized, resulting in a user experience that is not very friendly.
Disclosure of Invention
The embodiment of the application provides a method for synchronously playing multimedia information, which can ensure that a sender of the multimedia information and a receiver receiving the multimedia information are consistent when the multimedia information is played.
The embodiment of the application provides a method for synchronously playing multimedia information, which comprises the following steps:
sending a connection beacon frame, wherein the connection beacon frame is used for establishing connection with at least two playing devices;
when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission duration of the transmission test frame sent to each playing device is determined;
determining a transmission time stamp for transmitting multimedia information to each of the playing devices based on the transmission duration;
and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information.
An embodiment of the present application further provides a device for synchronously playing multimedia information, including:
a first sending unit, configured to send a connection beacon frame, where the connection beacon frame is used to establish a connection with at least two playback devices;
the first determining unit is used for sending a transmission test frame to each playing device when connection is established between the first determining unit and at least two playing devices, and determining the transmission time length of the transmission test frame sent to each playing device;
a second determining unit, configured to determine, based on the transmission duration, a transmission timestamp for transmitting multimedia information to each of the playback devices;
and the second sending unit is used for sending the multimedia information to corresponding playing devices according to the sending time stamps so that the receiving time stamps of the multimedia information received by each playing device are the same, and playing the received multimedia information.
The embodiment of the present application further provides a storage medium, in which a computer program is stored, and when the computer program runs on a computer, the computer is enabled to execute the method for synchronously playing multimedia information as described above.
The embodiment of the present application further provides a mobile terminal, where the mobile terminal includes a processor and a memory, and the memory stores a computer program, and the processor is configured to execute the method for synchronously playing multimedia information by calling the computer program stored in the memory.
The method for synchronously playing the multimedia information provided by the embodiment of the application comprises the following steps: sending a connection beacon frame, wherein the connection beacon frame is used for establishing connection with at least two playing devices; when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission duration of the transmission test frame sent to each playing device is determined; determining a transmission time stamp for transmitting multimedia information to each of the playing devices based on the transmission duration; and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information. The transmission duration of different equipment is determined by transmitting the test frame, and then the sending time stamp of the multimedia information sent to each playing equipment is determined, so that the receiving time stamps of the multimedia information received by each playing equipment are the same, and the sender of the multimedia information and the receiver of the multimedia information can keep consistent when the multimedia information is played.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1a is a system for synchronously playing multimedia information according to an embodiment of the present application.
Fig. 1b is a schematic flowchart of a method for synchronously playing multimedia information according to an embodiment of the present disclosure.
Fig. 1c is a schematic diagram of a test frame sending rule between a sender device and a playing device according to an embodiment of the present application.
Fig. 2 is a second flowchart of a method for synchronously playing multimedia information according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a device for synchronously playing multimedia information according to an embodiment of the present application.
Fig. 4 is a specific structural diagram of a mobile terminal according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1a, an embodiment of the present application provides a system for synchronously playing multimedia information, including: the multimedia information playing method includes that a sender device 10 sending multimedia information and receiver devices 20 and 30 receiving the multimedia information, wherein when the sender device 10 wants to send the multimedia information to peripheral playing devices, the receiver devices 20 and 30 can be found in a mode of finding the playing devices available around and under the same network connection (such as WiFi) with the sender device 10, and after connection with the receiver devices 20 and 30 is established, the multimedia information is sent to the receiver devices 20 and 30 and is played by the receiver devices 20 and 30, so that the receiver devices become the playing devices.
The sender device 10 and the receiver devices 20 and 30 may be devices such as a mobile phone, a tablet computer, and a notebook computer, and in fig. 1a, the sender device 10 is a notebook computer, the receiver device 20 is a tablet computer, and the receiver device 30 is a mobile phone, for example, each device may be installed with various applications required by a user, such as applications with an entertainment function (e.g., a video application, an audio playing application, a game application, and reading software), and applications with a service function (e.g., a map navigation application, a dining application, and the like).
Referring to fig. 1b, fig. 1b is a first flowchart illustrating a method for synchronously playing multimedia information according to an embodiment of the present application. The synchronous playing method of the multimedia information comprises the following steps:
Specifically, in the phase of establishing connection with surrounding devices, the sender device may release the connection beacon frame to find whether there are other playback devices in the preset connection range in the same network environment (for example, WiFi) as the sender device, so that the connection beacon frame is also a discovery beacon frame for discovering other playback devices in the preset control range.
The connection beacon frame is used for establishing connection with at least two playing devices.
As shown in table 1 and table 2, table 1 is information carried by the discovery beacon frame provided in the embodiment of the present application. Table 2 is attribute type.
TABLE 1
TABLE 2
Wherein Category means that the type of the Frame is Public Action Frame (Public Action Frame); action Field refers to the frame of public Action associated with a given manufacturer; OUI refers to organization Unique number (organization Unique Identifier); OUI Type refers to the Type of OUI; attributes refers to Attributes, including service description Attributes and manufacturer specific Attributes. In the manufacturer-specific Attribute, Attribute ID refers to the number of the manufacturer-specific Attribute; length refers to the sum of the byte lengths of OUI and Body; OUI refers to the manufacturer's number; body refers to manufacturer specific information.
In some embodiments, tables 1 and 2 may also be reduced to the form of table 3.
TABLE 3
Specifically, since multimedia information sent by the sender device needs to be played synchronously, and transmission time lengths of the sending information sent to each playing device based on the sender device are different, when a connection is established with at least two playing devices, a transmission test frame needs to be sent in advance for testing the transmission time length of the sending information sent to each playing device by the sender device.
The method for determining the transmission duration may be to send a transmission test frame to each playback device, and record a sending timestamp t1 for sending the transmission test frame to each playback device, so that when the playback device receives the transmission test frame, a feedback test frame is fed back, and the feedback test frame needs to carry a receiving timestamp of each playback device when receiving the transmission test frame. So that the sender can know the reception time stamp t2 of each playback device at the time of receiving the transmission test frame. When the sender device receives the feedback test frame, the transmission duration is the difference between the reception timestamp t2 and the feedback timestamp t1, that is, Δ t is t2-t 1. Therefore, sending a transmission test frame to each of the playback devices, and determining a transmission duration for sending the transmission test frame to each of the playback devices includes:
sending a transmission test frame to each playing device and recording a sending time stamp for sending the transmission test frame;
triggering the playing device to send a feedback test frame when receiving the transmission test frame, wherein the feedback test frame carries a receiving timestamp of the playing device receiving the transmission test frame;
and determining the transmission duration of the transmission test frame sent to each playing device according to the sending time stamp of the transmission test frame and the receiving time stamp of the transmission test frame.
In addition, after the connection is established between the sender device and the playing device, the order is thatThe present invention is not limited to the case where multimedia information can only be sent to a playback device by a sender device, and the playback device cannot send information to the sender device, and therefore, as shown in fig. 1c, fig. 1c is a schematic diagram of a test frame sending rule between the sender device and one playback device according to an embodiment of the present invention. Firstly, the sender device sends a transmission test frame 1 to the playing device at a time t3, so as to notify the playing device to feed back a feedback test frame 1 to the sender device; after receiving the transmission test frame 1, the playback device sends a feedback test frame 1 to the sender device at time t5, where the feedback test frame 1 carries a receiving timestamp t4 of the playback device receiving the transmission test frame 1 and a timestamp t5 of the playback device sending the feedback test frame to the sender device, then the transmission duration from the sender device to the playback device is t4-t3, and then the sender device receives the feedback test frame 1 sent by the playback device at time t6, and then the transmission duration from the playback device to the sender device is t6-t5, so that the transmission from the sender device to the playback device and the transmission from the playback device to the sender device are integrated, and the total transmission duration is the total transmission duration in the two transmission directions, i.e., the total transmission duration is the transmission duration
Thus, after the connection is established, the sender device can not only send the multimedia information to the playing device, but also receive the multimedia information sent by the playing device for information sharing.
Before sending the transmission test frame to each of the playback devices, the method further includes:
and sending a synchronous beacon frame to each playing device so as to be synchronous with the clock of each playing device.
And 103, determining a sending time stamp for sending the multimedia information to each playing device based on the transmission time length.
After the transmission duration required for the sender device to transmit information to the playback devices is obtained, in order to ensure that the playback devices play consistently, it is necessary to ensure that the receiving timestamps of each playback device at which the multimedia information sent by the sender device is received are the same. Therefore, it is necessary to determine a transmission time stamp for transmitting multimedia information to each playback device according to the transmission time length.
Specifically, please refer to table 4, in table 4, the sender device establishes a connection with the playback device 1 and the playback device 2, a transmission duration of the transmission test frame from the sender device to the playback device 1 is Δ t1, a transmission duration of the transmission test frame from the sender device to the playback device 2 is Δ t2, where Δ t1 is greater than Δ t 2.
TABLE 4
As it is required to ensure that the receiving timestamps of the multimedia information received by each playing device are consistent, the multimedia information needs to be sent to the playing device with the largest transmission time first, the sending timestamp of the multimedia information sent to each playing device is determined according to the transmission time lengths corresponding to other playing devices, as can be known from table 4, when the sending party device sends the multimedia information to the playing device 1 with the largest transmission time length at time T0, the receiving timestamp of the multimedia information received by the playing device 1 is T0+ Δ T1, and in order to ensure that the playing device 2 also receives the multimedia information at time T0+ Δ T1, the sending party device needs to send the multimedia information to the playing device 2 at time T0+ Δ T1- Δ T2. Therefore, determining a sending timestamp for sending multimedia information to each of the playback devices based on the transmission duration includes:
comparing the transmission time length, and determining the target playing device corresponding to the transmission time length with the maximum time length;
sending the multimedia information to the target playing equipment, and determining a target sending timestamp for sending the multimedia information to the target playing equipment;
determining a target receiving time stamp for each playing device to receive the multimedia information according to the target sending time stamp and the transmission time length corresponding to the target playing device;
and determining a sending time stamp for sending the multimedia information to each playing device according to the target receiving time stamp and the corresponding transmission time length of each playing device.
Specifically, the sender device needs encoding time when sending the multimedia information to the playing device, and similarly, the playing device needs decoding time after receiving the multimedia information, and in the actual process of receiving and sending the multimedia information, the encoding time, the decoding time and the turn of sending the multimedia information to the playing device need to be taken into consideration, so that the timestamps of sending the multimedia information to each playing device are more accurately guaranteed to be the same. Therefore, referring to table 5, table 5 is a table 4 that includes the encoding time, the decoding time, and the turn of transmitting the multimedia information to the playback device.
TABLE 5
| Route of travel | Transmission time stamp | Receiving time stamp |
| Sender device to playback device 1 | T0+n*T1 | T0+Δt1+n*T1 |
| Sender device to playback device 2 | T0+Δt1+n*T1-Δt2 | T0+Δt1+n*T1 |
Where T1 is the sum of the encoding time and the decoding time, n +1 is the round, when the sending-side device sends the multimedia information to the playing device 1 for the second time, n is 1, in order to ensure that the playing device 1 and the playing device 2 can receive the second audio-video data stream at the same time (T0+ Δ T1+ n × T1), it is required that the device a sends the second audio-video data stream to the playing device 1 at the time (T0+ T1), and then the device a sends the second audio-video data stream to the playing device 2 at the time (T0+ T1+ Δ T1- Δ T2). The time interval between device a sending the second stream of audiovisual data to devices B and C is still (Δ t1- Δ t 2). In the same way, it can be deduced that n is equal to 2 when the sender device sends the third piece of multimedia information. Therefore, after the sending the multimedia information to the target playing device, the method further includes:
detecting whether the multimedia information is sent to the target playing equipment for the first time or not to obtain a detection result;
the determining a target transmission timestamp for transmitting the multimedia information to the target playback device includes:
if the detection result is that the multimedia information is not sent to the target playing equipment for the first time, acquiring the encoding time length for sending the multimedia information, the decoding time length of each playing equipment for the multimedia information and the sending turn for sending the multimedia information to the target playing equipment;
and determining the target sending time stamp for sending the multimedia information to the target playing equipment according to the encoding time length, the decoding time length and the sending turn.
After the sending timestamp of the multimedia information sent by the sending device to each playing device is determined, theoretically, the receiving timestamps of the multimedia information received by each playing device should be the same, but due to factors such as network environment, the receiving timestamps of the multimedia information received by each playing device may be different, and therefore, a feedback mechanism may be added, please refer to table 6.
TABLE 6
| Route of travel | Transmission time stamp | Receiving time stamp |
| Sender device to playback device 1 | T0+T1+TB-TC | T0+Δt1+T1 |
| Sender device to playback device 2 | T0+T1+Δt1-Δt2 | T0+Δt1+T1 |
Taking the example of the sender device sending the first piece of multimedia information, the playing device 1 records the timestamp of receiving the first piece of multimedia information as TBThe playback device 2 records the time stamp of the reception of the first audio-visual data stream as TC. The playback device 1 and the playback device 2 feed back respective reception timestamps to the sender device, assuming TBGreater than TC(i.e., the playing device 2 receives the first piece of multimedia information before the playing device 1), the target transmission timestamp for the sender device to transmit the second piece of multimedia information may be corrected. Thereby obtaining a transmission time stamp of T0+ T1+ T for transmitting the second piece of multimedia information to the playback device 1B-TC. Therefore, after the multimedia information is sent to the corresponding playing device according to the sending timestamp, the method further includes:
triggering each playing device to feed back a response message, wherein the response message carries a second receiving timestamp of the multimedia message received by each playing device;
judging whether a second receiving time stamp corresponding to the playing device is different from a second receiving time stamp corresponding to the target playing device;
if the second receiving timestamp corresponding to the playing device is different from the second receiving timestamp corresponding to the target playing device, determining a time calibration value according to the second receiving timestamp corresponding to the target playing device and the second receiving timestamp corresponding to the playing device different from the second receiving timestamp corresponding to the target playing device;
and determining a sending time stamp for sending the multimedia information to the target playing equipment based on the time calibration value and the transmission duration.
And 104, sending the multimedia information to corresponding playing devices according to the sending time stamps so that the receiving time stamps of the multimedia information received by each playing device are the same, and playing the received multimedia information.
After the sending time stamp of the multimedia information sent to each playing device is determined, the sending time stamp is sent to the corresponding playing device to send the multimedia information, so that the receiving time stamps of the multimedia information received by each playing device are the same, and the received multimedia information is played.
The method for synchronously playing the multimedia information provided by the embodiment of the application comprises the following steps: sending a connection beacon frame, wherein the connection beacon frame is used for establishing connection with at least two playing devices; when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission duration of the transmission test frame sent to each playing device is determined; determining a transmission time stamp for transmitting multimedia information to each of the playing devices based on the transmission duration; and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information. The transmission duration of different equipment is determined through the transmission test frame, and then the sending time stamp of the multimedia information sent to each playing equipment is determined, so that the receiving time stamps of the multimedia information received by each playing equipment are the same, and a sender of the multimedia information and a receiver of the multimedia information can be kept consistent when the multimedia information is played.
In some embodiments, as shown in fig. 2, a method for synchronously playing multimedia information is provided, where the method for synchronously playing multimedia information includes:
Specifically, in the phase of establishing a connection with a peripheral device, the sender device may release the connection beacon frame to find whether there are other playback devices in the preset connection range in the same network environment (for example, WiFi) as the sender device, so that the connection beacon frame is also a discovery beacon frame to discover the other playback devices in the preset control range.
The connection beacon frame is used for establishing connection with at least two playing devices.
As shown in table 1 and table 2, Category means that the Frame type is Public Action Frame (Public Action Frame); action Field refers to the frame of public Action associated with a given manufacturer; OUI refers to organization Unique number (organization Unique Identifier); OUI Type refers to the Type of OUI; attributes refers to Attributes, including service description Attributes and manufacturer specific Attributes. In the manufacturer-specific Attribute, Attribute ID refers to the number of the manufacturer-specific Attribute; length refers to the sum of the byte lengths of OUI and Body; OUI refers to the manufacturer's number; body refers to manufacturer specific information.
In some embodiments, tables 1 and 2 may also be reduced to the form of table 3.
Specifically, after the connection is established, a synchronization beacon frame needs to be sent to each playback device, so that the clocks of each playback device and the sender device are kept consistent.
Step 203, sending a transmission test frame to each playing device and recording a sending time stamp of the transmission test frame.
Specifically, since multimedia information sent by the sender device needs to be played synchronously, and transmission time lengths of the sending information sent to each playing device based on the sender device are different, when a connection is established with at least two playing devices, a transmission test frame needs to be sent in advance for testing the transmission time length of the sending information sent to each playing device by the sender device.
The method for determining the transmission duration may be to send a transmission test frame to each playback device, and record a sending timestamp t1 for sending the transmission test frame to each playback device, so that when the playback device receives the transmission test frame, a feedback test frame is fed back, and the feedback test frame needs to carry a receiving timestamp of each playback device when receiving the transmission test frame. So that the sender can know the reception time stamp t2 of each playback device at the time of receiving the transmission test frame. When the sender device receives the feedback test frame, the transmission duration is the difference between the reception timestamp t2 and the feedback timestamp t1, that is, Δ t is t2-t 1.
In addition, since the sending device is not limited to the case where the sending device can only send multimedia information to the playback device and the playback device cannot send information to the sending device after the sending device and the playback device are connected, as shown in fig. 1c, fig. 1c is a schematic diagram of a test frame sending rule between the sending device and one playback device according to an embodiment of the present application. Firstly, the sender device sends a transmission test frame 1 to the playing device at time t3, so as to inform the playing device to feed back a feedback test frame 1 to the sender device; after receiving the transmission test frame 1, the playing device sends a feedback test frame 1 to the sending device at time t5, where the feedback test frame 1 carries a receiving timestamp t4 of the playing device receiving the transmission test frame 1 and a timestamp t5 of the playing device sending the feedback test frame to the sending device, so that the transmission time from the sending device to the playing device is t4-t3, and then the sending device receives the feedback test frame 1 sent by the playing device at time t6, so that the playing device sends the transmission frame 1 to the sending deviceThe duration is t6-t5, so the transmission from the sender device to the playback device and the transmission from the playback device to the sender device are combined, and the total transmission duration is the transmission duration in both directions
Thus, after the connection is established, the sender device can not only send the multimedia information to the playing device, but also receive the multimedia information sent by the playing device for information sharing.
After the transmission duration required for the sender device to transmit information to the playback devices is obtained, in order to ensure that the playback devices play consistently, it is necessary to ensure that the receiving timestamps of each playback device at which the multimedia information sent by the sender device is received are the same. Therefore, it is necessary to determine a transmission time stamp for transmitting multimedia information to each playback device according to the transmission time length.
Specifically, please refer to table 4, in table 4, the sender device establishes a connection with the playback device 1 and the playback device 2, a transmission duration of the transmission test frame from the sender device to the playback device 1 is Δ t1, a transmission duration of the transmission test frame from the sender device to the playback device 2 is Δ t2, where Δ t1 is greater than Δ t 2. As it is required to ensure that the receiving timestamps of the multimedia information received by each playing device are consistent, the multimedia information needs to be sent to the playing device with the largest transmission time first, the sending timestamp of the multimedia information sent to each playing device is determined according to the transmission time lengths corresponding to other playing devices, as can be known from table 4, when the sending party device sends the multimedia information to the playing device 1 with the largest transmission time length at time T0, the receiving timestamp of the multimedia information received by the playing device 1 is T0+ Δ T1, and in order to ensure that the playing device 2 also receives the multimedia information at time T0+ Δ T1, the sending party device needs to send the multimedia information to the playing device 2 at time T0+ Δ T1- Δ T2.
And step 208, detecting whether multimedia information is sent to the target playing equipment for the first time or not to obtain a detection result.
Specifically, the sender device needs encoding time when sending the multimedia information to the playing device, and similarly, the playing device needs decoding time after receiving the multimedia information, and in the actual process of receiving and sending the multimedia information, the encoding time, the decoding time and the turn of sending the multimedia information to the playing device need to be taken into consideration, so that the timestamps of sending the multimedia information to each playing device are more accurately guaranteed to be the same. Therefore, referring to table 5, table 5 is a table based on table 4, wherein the encoding time, the decoding time and the turn of sending the multimedia information to the playing device are included.
Step 209, if the detection result is that the multimedia information is not sent to the target playing device for the first time, acquiring the encoding time length for sending the multimedia information, the decoding time length of each playing device for the multimedia information, and the sending turn for sending the multimedia information to the target playing device.
Where T1 is the sum of the encoding time and the decoding time, n +1 is the round, when the sending-side device sends the multimedia information to the playing device 1 for the second time, n is 1, in order to ensure that the playing device 1 and the playing device 2 can receive the second audio-video data stream at the same time (T0+ Δ T1+ n × T1), it is required that the device a sends the second audio-video data stream to the playing device 1 at the time (T0+ T1), and then the device a sends the second audio-video data stream to the playing device 2 at the time (T0+ T1+ Δ T1- Δ T2). The time interval between device a sending the second stream of audiovisual data to devices B and C is still (Δ t1- Δ t 2). In the same way, it can be deduced that n is equal to 2 when the sender device sends the third piece of multimedia information.
And step 210, determining a target sending time stamp for sending the multimedia information to the target playing equipment according to the encoding time length, the decoding time length and the sending turn.
And step 213, sending the multimedia information to the corresponding playing device according to the sending time stamp.
After the sending time stamp of the multimedia information sent to each playing device is determined, the sending time stamp is sent to the corresponding playing device to send the multimedia information, so that the receiving time stamps of the multimedia information received by each playing device are the same, and the received multimedia information is played.
After the sending timestamp of the multimedia information sent by the sending device to each playing device is determined, theoretically, the receiving timestamps of the multimedia information received by each playing device should be the same, but due to factors such as network environment, the receiving timestamps of the multimedia information received by each playing device may be different, and therefore, a feedback mechanism may be added, please refer to table 6.
Step 215, determining whether a second receiving timestamp corresponding to the playing device is different from a second receiving timestamp corresponding to the target playing device.
Taking the example of the sender device sending the first piece of multimedia information, the playing device 1 records the timestamp of receiving the first piece of multimedia information as TBThe playback device 2 records the time stamp of the reception of the first audio-visual data stream as TC. The playback device 1 and the playback device 2 feed back respective reception timestamps to the sender device, assuming TBGreater than TC(i.e. the playing device 2 receives the first piece of multimedia information before the playing device 1), the target sending timestamp for the sending device to send the second piece of multimedia information may be modified. Thereby obtaining a transmission time stamp of T0+ T1+ T for transmitting the second piece of multimedia information to the playback device 1B-TC。
And step 217, determining a sending time stamp for sending the multimedia information to the target playing device based on the time calibration value and the transmission time length.
The method for synchronously playing the multimedia information provided by the embodiment of the application comprises the following steps: sending a connection beacon frame, wherein the connection beacon frame is used for establishing connection with at least two playing devices; when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission duration of the transmission test frame sent to each playing device is determined; determining a transmission time stamp for transmitting multimedia information to each of the playing devices based on the transmission duration; and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information. The transmission duration of different equipment is determined by transmitting the test frame, and then the sending time stamp of the multimedia information sent to each playing equipment is determined, so that the receiving time stamps of the multimedia information received by each playing equipment are the same, and the sender of the multimedia information and the receiver of the multimedia information can keep consistent when the multimedia information is played.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a synchronous playing device for multimedia information according to an embodiment of the present application. The synchronous playing device of the multimedia information comprises: a first transmitting unit 31, a first determining unit 32, a second determining unit 33, and a second transmitting unit 34.
The first sending unit 31 is configured to send a connection beacon frame, where the connection beacon frame is used to establish a connection with at least two playing devices.
Specifically, in the phase of establishing connection with surrounding devices, the sender device may release the connection beacon frame to find whether there are other playback devices in the preset connection range in the same network environment (for example, WiFi) as the sender device, so that the connection beacon frame is also a discovery beacon frame for discovering other playback devices in the preset control range.
The first determining unit 32 is configured to send a transmission test frame to each playback device when a connection is established with at least two playback devices, and determine a transmission duration for the transmission test frame to be sent to each playback device.
Specifically, since multimedia information sent by the sender device needs to be played synchronously, and transmission time lengths of the sending information sent to each playing device based on the sender device are different, when a connection is established with at least two playing devices, a transmission test frame needs to be sent in advance for testing the transmission time length of the sending information sent to each playing device by the sender device.
The second determining unit 33 is configured to determine a sending timestamp for sending the multimedia information to each of the playing devices based on the transmission duration.
After the transmission duration required for the sender device to transmit information to the playback devices is obtained, in order to ensure that the playback devices play consistently, it is necessary to ensure that the receiving timestamps of each playback device at which the multimedia information sent by the sender device is received are the same. Therefore, it is necessary to determine a transmission time stamp for transmitting multimedia information to each playback device according to the transmission time length.
A second sending unit 34, configured to send the multimedia information to corresponding playing devices according to the sending timestamps, so that the receiving timestamps of the multimedia information received by each playing device are the same, and play the received multimedia information.
After the sending time stamp of the multimedia information sent to each playing device is determined, the sending time stamp is sent to the corresponding playing device to send the multimedia information, so that the receiving time stamps of the multimedia information received by each playing device are the same, and the received multimedia information is played.
In some embodiments, the first determining unit 32 is further configured to:
the recording subunit is used for sending a transmission test frame to each playing device and recording a sending time stamp for sending the transmission test frame;
the triggering subunit is configured to trigger the playback device to send a feedback test frame when receiving the transmission test frame, where the feedback test frame carries a receiving timestamp of the playback device receiving the transmission test frame;
and the determining subunit is configured to determine, according to the sending timestamp for sending the transmission test frame and the receiving timestamp for receiving the transmission test frame, a transmission duration for sending the transmission test frame to each of the playback devices.
Based on the method, the present invention further provides a storage medium having a plurality of instructions stored thereon, wherein the instructions are suitable for being loaded by a processor and executing the method for synchronously playing multimedia information as described above.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
Fig. 4 is a specific block diagram of a terminal according to an embodiment of the present invention, where the terminal may be used to implement the method, the storage medium, and the terminal for synchronously playing multimedia information provided in the foregoing embodiments.
As shown in fig. 4, the mobile terminal 1200 may include an RF (Radio Frequency) circuit 110, a memory 120 including one or more computer-readable storage media (only one shown), an input unit 130, a display unit 140, a sensor 150, an audio circuit 160, a transmission module 170, a processor 180 including one or more processing cores (only one shown), and a power supply 190. Those skilled in the art will appreciate that the mobile terminal 1200 configuration shown in fig. 4 is not intended to be limiting of the mobile terminal 1200 and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. Wherein:
the RF circuitry 110 may include various existing circuit elements for performing these functions, such as an antenna, a radio frequency transceiver, a digital signal processor, an encryption/decryption chip, a Subscriber Identity Module (SIM) card, memory, and so forth. The RF circuit 110 may communicate with various networks such as the internet, an intranet, a wireless network, or with a second device over a wireless network. The wireless network may comprise a cellular telephone network, a wireless local area network, or a metropolitan area network.
The memory 120 may be used to store software programs and modules, such as program instructions/modules corresponding to the method, the apparatus, the storage medium, and the mobile terminal for synchronously playing multimedia information in the foregoing embodiments, and the processor 180 executes various functional applications and data processing by operating the software programs and modules stored in the memory 120, so as to implement the function of mutually identifying chips. Memory 120 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or a second non-volatile solid-state memory. In some examples, memory 120 may be a storage medium as described above.
The input unit 130 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. In particular, the input unit 130 may include a touch-sensitive surface 131 as well as other input devices 132. The touch-sensitive surface 131, also referred to as a touch display screen or a touch pad, may collect touch operations by a user on or near the touch-sensitive surface 131 (e.g., operations by a user on or near the touch-sensitive surface 131 using a finger, a stylus, or any other suitable object or attachment), and drive the corresponding connection device according to a predetermined program. Alternatively, the touch sensitive surface 131 may comprise two parts, a touch detection means and a touch controller.
The display unit 140 may be used to display information input by or provided to the user and various graphic user interfaces of the mobile terminal 1200, which may be configured by graphics, text, icons, video, and any combination thereof. Display unit 140 may include a display panel 141, and further, touch-sensitive surface 131 may cover display panel 141. In the above embodiment, the display interface of the mobile terminal may be represented by the display unit 140, that is, the display content for displaying the synchronized playing of the multimedia information may be displayed by the display unit 140.
The mobile terminal 1200 may also include at least one sensor 150, such as a light sensor, a motion sensor, and a second sensor. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel 141 according to the brightness of ambient light, and a proximity sensor that may turn off the display panel 141 and/or the backlight when the mobile terminal 1200 is moved to the ear. As for the second sensor such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which may be further configured in the mobile terminal 1200, the detailed description is omitted here.
The mobile terminal 1200, which can help a user send and receive e-mails, browse web pages, access streaming media, etc., provides the user with wireless broadband internet access through the transmission module 170.
The processor 180 is a control center of the mobile terminal 1200, connects various parts of the entire mobile phone using various interfaces and lines, and performs various functions of the mobile terminal 1200 and processes data by operating or executing software programs and/or modules stored in the memory 120 and calling data stored in the memory 120, thereby integrally monitoring the mobile phone. Optionally, processor 180 may include one or more processing cores; in some embodiments, the processor 180 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 180.
Specifically, the processor 180 includes: an Arithmetic Logic Unit (ALU), an application processor, a Global Positioning System (GPS) and a control and status Bus (Bus) (not shown).
The mobile terminal 1200 also includes a power supply 190 (e.g., a battery) for powering the various components, which may be logically coupled to the processor 180 via a power management system in some embodiments to provide management of power, and power consumption via the power management system. The power supply 190 may also include any component including one or more of a dc or ac power source, a re-power system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.
Although not shown, the mobile terminal 1200 may further include a camera (e.g., a front camera, a rear camera), a bluetooth module, and the like, which are not described in detail herein.
Specifically, in the present embodiment, the display unit 140 of the mobile terminal 1200 is a touch screen display, and the mobile terminal 1200 further includes a memory 120 and one or more programs, wherein the one or more programs are stored in the memory 120, and the one or more programs configured to be executed by the one or more processors 180 include instructions for:
sending a connection beacon frame, wherein the connection beacon frame is used for establishing connection with at least two playing devices;
when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission duration of the transmission test frame sent to each playing device is determined;
determining a transmission time stamp for transmitting multimedia information to each of the playing devices based on the transmission duration;
and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information.
In some embodiments, when the transmission test frame is sent to each of the playback devices, and the transmission time length of the transmission test frame sent to each of the playback devices is determined, the processor 380 may further execute the following instructions:
sending a transmission test frame to each playing device and recording a sending time stamp for sending the transmission test frame;
triggering the playing device to send a feedback test frame when receiving the transmission test frame, wherein the feedback test frame carries a receiving timestamp of the playing device receiving the transmission test frame;
and determining the transmission duration of the transmission test frame sent to each playing device according to the sending time stamp of the transmission test frame and the receiving time stamp of the transmission test frame.
In some embodiments, when determining the transmission time stamp for transmitting multimedia information to each of the playback devices based on the transmission time duration, processor 380 may further execute the following instructions:
comparing the transmission time length, and determining the target playing device corresponding to the transmission time length with the maximum time length;
sending the multimedia information to the target playing equipment, and determining a target sending timestamp for sending the multimedia information to the target playing equipment;
determining a target receiving time stamp for each playing device to receive the multimedia information according to the target sending time stamp and the transmission time length corresponding to the target playing device;
and determining a sending time stamp for sending the multimedia information to each playing device according to the target receiving time stamp and the corresponding transmission time length of each playing device.
In some embodiments, after sending the multimedia information to the target playback device, processor 380 may further execute instructions to:
detecting whether the multimedia information is sent to the target playing equipment for the first time or not to obtain a detection result;
the determining a target transmission timestamp for transmitting the multimedia information to the target playback device includes:
if the detection result is that the multimedia information is not sent to the target playing equipment for the first time, acquiring the encoding time length for sending the multimedia information, the decoding time length of each playing equipment for the multimedia information and the sending turn for sending the multimedia information to the target playing equipment;
and determining the target sending time stamp for sending the multimedia information to the target playing equipment according to the encoding time length, the decoding time length and the sending turn.
In some embodiments, after sending the multimedia information to the corresponding playback device according to the sending timestamp, the processor 380 may further execute the following instructions:
triggering each playing device to feed back a response message, wherein the response message carries a second receiving timestamp of the multimedia message received by each playing device;
judging whether a second receiving time stamp corresponding to the playing device is different from a second receiving time stamp corresponding to the target playing device;
if the second receiving timestamp corresponding to the playing device is different from the second receiving timestamp corresponding to the target playing device, determining a time calibration value according to the second receiving timestamp corresponding to the target playing device and the second receiving timestamp corresponding to the playing device different from the second receiving timestamp corresponding to the target playing device;
and determining a sending time stamp for sending the multimedia information to the target playing equipment based on the time calibration value and the transmission duration.
In some embodiments, before sending the transmission test frame to each of the playback devices, processor 380 may further execute the following instructions:
and sending a synchronous beacon frame to each playing device so as to be synchronous with the clock of each playing device.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing describes in detail a method, an apparatus, a storage medium, and a mobile terminal for synchronously playing multimedia information provided in an embodiment of the present application, and a specific example is applied in the description to explain the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understand the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (8)
1. A method for synchronously playing multimedia information is characterized by comprising the following steps:
sending a connection beacon frame, wherein the connection beacon frame is used for establishing connection with at least two playing devices;
when connection is established with at least two playing devices, a transmission test frame is sent to each playing device, and the transmission duration of the transmission test frame sent to each playing device is determined;
comparing the transmission time length, and determining the target playing device corresponding to the transmission time length with the maximum time length;
sending the multimedia information to the target playing equipment, detecting whether the multimedia information is sent to the target playing equipment for the first time or not to obtain a detection result, and if the detection result is that the multimedia information is not sent to the target playing equipment for the first time, obtaining the encoding time length for sending the multimedia information, the decoding time length of each playing equipment for the multimedia information and the sending turn for sending the multimedia information to the target playing equipment;
determining the target sending timestamp for sending the multimedia information to the target playing equipment according to the encoding duration, the decoding duration and the sending turn;
determining a target receiving time stamp for each playing device to receive the multimedia information according to the target sending time stamp and the transmission time length corresponding to the target playing device;
determining a sending time stamp for sending the multimedia information to each playing device according to the target receiving time stamp and the corresponding transmission time length of each playing device;
and sending the multimedia information to corresponding playing equipment according to the sending time stamp so as to enable the receiving time stamps of the multimedia information received by each playing equipment to be the same, and playing the received multimedia information.
2. The method for synchronously playing multimedia information according to claim 1, wherein the sending a transmission test frame to each of the playing devices and determining a transmission duration for the transmission test frame to be sent to each of the playing devices comprises:
sending a transmission test frame to each playing device and recording a sending time stamp for sending the transmission test frame;
triggering the playing device to send a feedback test frame when receiving the transmission test frame, wherein the feedback test frame carries a receiving timestamp of the playing device receiving the transmission test frame;
and determining the transmission duration of the transmission test frame sent to each playing device according to the sending time stamp of the transmission test frame and the receiving time stamp of the transmission test frame.
3. The method for synchronously playing the multimedia information according to claim 1, wherein after the step of sending the multimedia information to the corresponding playing device according to the sending timestamp, the method further comprises:
triggering each playing device to feed back a response message, wherein the response message carries a second receiving timestamp of the multimedia message received by each playing device;
judging whether a second receiving time stamp corresponding to the playing device is different from a second receiving time stamp corresponding to the target playing device;
if a second receiving timestamp corresponding to the playing device is different from a second receiving timestamp corresponding to the target playing device, determining a time calibration value according to the second receiving timestamp corresponding to the target playing device and a second receiving timestamp corresponding to the playing device different from the second receiving timestamp corresponding to the target playing device;
and determining a sending time stamp for sending the multimedia information to the target playing equipment based on the time calibration value and the transmission duration.
4. The method for synchronously playing back multimedia information according to claim 1, further comprising, before said sending a transmission test frame to each of said playback devices:
and sending a synchronous beacon frame to each playing device so as to be synchronous with the clock of each playing device.
5. A device for synchronously playing multimedia information, comprising:
a first sending unit, configured to send a connection beacon frame, where the connection beacon frame is used to establish a connection with at least two playback devices;
the first determining unit is used for sending a transmission test frame to each playing device when connection is established with at least two playing devices, and determining the transmission time length of the transmission test frame sent to each playing device;
the second determining unit is used for comparing the transmission time length and determining the target playing device corresponding to the transmission time length with the maximum time length;
sending the multimedia information to the target playing equipment, detecting whether the multimedia information is sent to the target playing equipment for the first time or not to obtain a detection result, and if the detection result is that the multimedia information is not sent to the target playing equipment for the first time, obtaining the encoding time length for sending the multimedia information, the decoding time length of each playing equipment for the multimedia information and the sending turn for sending the multimedia information to the target playing equipment;
determining the target sending time stamp for sending the multimedia information to the target playing equipment according to the encoding time length, the decoding time length and the sending turn;
determining a target receiving time stamp for each playing device to receive the multimedia information according to the target sending time stamp and the transmission time length corresponding to the target playing device;
determining a sending time stamp for sending the multimedia information to each playing device according to the target receiving time stamp and the corresponding transmission time length of each playing device;
and the second sending unit is used for sending the multimedia information to corresponding playing devices according to the sending time stamps so that the receiving time stamps of the multimedia information received by each playing device are the same, and playing the received multimedia information.
6. The apparatus for synchronously playing multimedia information according to claim 5, wherein said first determining unit comprises:
a recording subunit, configured to send a transmission test frame to each playback device and record a sending timestamp for sending the transmission test frame;
the triggering subunit is configured to trigger the playback device to send a feedback test frame when receiving the transmission test frame, where the feedback test frame carries a receiving timestamp of the playback device receiving the transmission test frame;
and the determining subunit is configured to determine, according to the sending timestamp for sending the transmission test frame and the receiving timestamp for receiving the transmission test frame, a transmission duration for sending the transmission test frame to each of the playback devices.
7. A computer-readable storage medium, in which a computer program is stored, which, when run on a computer, causes the computer to execute the method of synchronized playback of multimedia information according to any one of claims 1 to 4.
8. A mobile terminal, characterized in that the mobile terminal comprises a processor and a memory, wherein the memory stores a computer program, and the processor is used for executing the method for synchronously playing multimedia information according to any one of claims 1 to 4 by calling the computer program stored in the memory.
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