CN115967783B - Method and circuit system for switching audio and video receiving interface - Google Patents
Method and circuit system for switching audio and video receiving interface Download PDFInfo
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Abstract
说明书提出一种切换影音接收接口的方法与电路系统，电路系统设于一积储端装置中，在每个影音接收接口的协议层电路中设有一状态与控制数据通道控制模组，当积储端装置的多个影音接收接口连接多个影音来源时，通过此状态与控制数据通道控制模组持续回应影音来源发送的信息，使得影音来源可以根据积储端装置的回应而持续送出固定速率链路讯号至积储端装置。协议层电路设有一固定速率链路影音封包侦测模组，针对积储端装置切换到的影音接收接口，开始侦测固定速率链路的速率，再解析影音封包，以取得影音数据。
The specification proposes a method and circuit system for switching audio and video receiving interfaces. The circuit system is provided in a storage terminal device. A status and control data channel control module is provided in the protocol layer circuit of each audio and video receiving interface. When multiple audio and video receiving interfaces of the storage terminal device are connected to multiple audio and video sources, the status and control data channel control module continuously responds to the information sent by the audio and video sources, so that the audio and video sources can continuously send fixed rate link signals to the storage terminal device according to the response of the storage terminal device. The protocol layer circuit is provided with a fixed rate link audio and video packet detection module. For the audio and video receiving interface switched to by the storage terminal device, the rate of the fixed rate link is detected, and then the audio and video packets are parsed to obtain the audio and video data.
Description
Technical Field
The present disclosure provides a system for playing video, and more particularly, to a method and circuit system for saving time spent in playing video after switching video connection ports by modifying firmware to avoid stopping link training.
Background
According to the demands of different interfaces in the consumer market, the Display often has multiple image receiving interfaces, for example, different numbers of Display ports (Display ports) and High-definition multimedia interfaces (High-Definition Multimedia Interface, HDMI) are commonly arranged in a Display device at the same time, so that a user can switch different interfaces to receive image data of different interfaces by using the same Display, or multiple receiving ports are arranged in one interface, so that the user can switch different receiving ports to receive image data of the same interface from different sources.
For example, referring to fig. 1, a schematic diagram of a conventional display architecture employing a high-definition multimedia interface and a display port is shown, wherein the operation process can refer to the flowchart of fig. 2 for switching the image receiving interface to establish an audio-video connection.
Fig. 1 shows a sink device (sink) 10 for receiving video and audio contents and playing out the video and audio contents, wherein the video receiving interface is a circuit as shown in the drawings, the sink device 10 is provided with two high definition multimedia interfaces, such as HDMI Port a (111) and HDMI Port B (112), and a Display Port (Display Port) 113, HDMI Port a (111), HDMI Port B (112) and Display Port 113 respectively have respective power circuits in the sink device 10, such as power domains (power domains) 101, 102 and 103, and the power domains 101, 102 and 103 are designed independently of the power domain of the main circuit (not shown in the drawings) in the sink device 10.
In this example, the HDMI port a (111), the HDMI port B (112) and the display port 113 are respectively connected to the av source a (11), the av source B (12) and the av source C (13) through respective av signal lines 121, 122 and 123, and as shown in step S201 of fig. 2, connection between each of the video receiving interfaces and the av source is established, and one of the av sources is switched to be received according to the user operation of the storage device 10. In this example, when the user is playing the video content received from the video source C (13) through the display port 113, as shown in step S203, the user plays the video content of a certain source (in this example, the video source C (13)), and two other video receiving interfaces have the following two situations.
In one of the cases, in order to reduce the power consumption of the storage device 10, the main circuits of the power domains 101 and 102 are powered off, so that even if the video signal lines of the interfaces are connected, the data transmission channel (data transmission channel) cannot be established with the video source a (11) and the video source B (12) through the link training (LINK TRAINING) because the power domains 101 and 102 are powered off. At this time, since the Link training cannot be successful, the video source a (11) and the video source B (12) will not send a Fixed Rate Link (FRL) signal, as shown in step S205 of fig. 2, other video interfaces that are not playing cannot complete the HDMI Link training with the video source, or cannot continuously respond to the polling of the video source, so that the video source stops sending the FRL signal until the user switches the current connection and the display port 113 and the video signal line thereof to the video source a (11) and the video source B (12).
When the user operates the storage device 10 to switch to receive the audio/video content from the audio/video source a (11) through the HDMI port a (111), as shown in step S207 of fig. 2, the storage device 10 turns on the power of the corresponding power domain 101, and restarts the link training between the storage device 10 and the audio/video source a (11) through the hot plug switch (hot plug toggle) to establish the data transmission channel, as shown in step S209 of fig. 2, starts the HDMI hot plug switch to restart the link training program, and step S211, starts the link training between the storage device 10 and the audio/video source a (11), and after waiting for the link training success, as shown in step S213 of fig. 2, establishes a fixed rate link, so as to play the audio/video content of the audio/video source a (11), as shown in step S215.
In another case, even when the HDMI content provided by the audio-visual source a (11) or the audio-visual source B (12) is not played, the storage device 10 maintains the power domains 101 and 102 with power, so that when the HDMI cable (the audio-visual signal lines 121 and 122) is connected to the audio-visual source a (11) or the audio-visual source B (12), the link training can be completed and the data transmission channel can be established. Thus, when the user wants to switch to one of the HDMI audio/video sources, the audio/video source a (11) or the audio/video source B (12) does not need to restart the link training program through the hot plug toggle (hot toggle) as long as the switch is performed. But this is to make the power domains 101 and 102 full time powered, increasing power consumption.
According to the above description of the prior art, when a user wants to switch and display images received by other audio/video receiving interfaces from the currently played audio/video content, the switching process needs to wait for the switched image receiving interface to reestablish the data transmission channel before starting to receive the image data. Such a situation can cause a user to experience poor viewing of video and audio when switching between different video receiving interfaces.
Another embodiment is a schematic diagram of a conventional display circuit architecture employing a high-definition multimedia interface as shown in fig. 3.
The storage device 30 is provided with a plurality of HDMI interfaces, such as HDMI port a (301) and HDMI port B (302), which are connected to the audio/video source a (31) and the audio/video source B (32) through audio/video signal lines 331 and 332, respectively. Each HDMI interface includes a physical layer (PHYSICAL LAYER) and a protocol layer (protocol layer), and in this example, the related circuits of the HDMI port a (301) include an HDMI physical layer a (311) and an HDMI protocol layer a (321), and the related circuits of the HDMI port B (302) include an HDMI physical layer B (312) and an HDMI protocol layer B (322). When the fixed-rate link signal enters the HDMI interface, the corresponding physical layer converts the fixed-rate link signal into a digital signal, and then the protocol layer resolves the image data, so that when the storage device 30 has a plurality of HDMI interfaces, a plurality of HDMI protocol layers are simultaneously required, and the HDMI protocol layers are complex high-speed signals, so that the circuit area occupied by the circuits of the plurality of protocol layers is quite large.
Disclosure of Invention
In view of the problem of delay caused by the need of reconstructing the data transmission channel when switching between different image receiving interfaces in a display in the prior art, the present disclosure proposes a method and a circuit system for switching between video and audio receiving interfaces, which can save the waiting image display time when a user switches between the high-definition multimedia interfaces by modifying the operation mechanism of a Fixed Rate Link (FRL) defined by a specific version of the high-definition multimedia interface (e.g., HDMI 2.1), and can be applied to a architecture where a plurality of high-definition multimedia interfaces share a set of circuits, thereby achieving the purpose of minimizing circuit design.
According to the embodiment, the circuit system is a circuit system in a storage device, such as an audio/video processing chip, wherein each audio/video receiving interface is provided with a state and control data channel control module for communicating with an audio/video source through a state and control data channel and providing information for the audio/video source to poll, and the circuit system mainly comprises a fixed rate link audio/video packet detection module for reconstructing the fixed rate link through the steps of signal detection, transmission rate judgment of the fixed rate link, fixed rate link packet judgment and the like.
In the method, when a plurality of video sources are connected with a plurality of video receiving interfaces in the storage device, each video receiving interface continuously responds to a state and control data channel communication request sent by the corresponding video source to the storage device through a state and control data channel control module, and then each video source can continuously send a fixed-rate link signal to the storage device according to the continuous response of the state and control data channel control module. Therefore, when the storage device is switched to one of the audio-video receiving interfaces, the transmission rate and the packets of the fixed-rate link can be detected by the fixed-rate link audio-video packet detection module, so that the storage device can acquire audio-video data from one of the audio-video sources connected with the audio-video receiving interfaces according to the rate information.
Preferably, the information continuously acquired by the plurality of audio-visual sources through the corresponding state and control data channel control module comprises one or more check points set in the state and control data channel control module by the storage end device.
Furthermore, the audio-video receiving interfaces in the storage device are respectively connected with an audio-video interface physical layer and a state and control data channel control module, and share an audio-video interface protocol layer through a switching circuit.
Further, when the storage device is switched to one of the audio-video receiving interfaces, other audio-video sources which are not playing continuously respond to the state and control data channel communication request sent by each audio-video source through the state and control data channel control module, so that each audio-video source continuously sends out a fixed-rate link signal according to the continuous response of the storage device, and the storage device and each audio-video source complete the link training.
After the audio-video packet is analyzed to obtain the transmission rate, the circuit system resets the parameters of the audio-video receiving interface and the audio-video interface physical layer in the accumulation device so as to obtain the audio-video data through the fixed rate link.
For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and to the accompanying drawings, which are provided for purposes of reference only and are not intended to limit the invention.
Drawings
FIG. 1 is a schematic diagram of a conventional display architecture employing a high-definition multimedia interface and a display port;
FIG. 2 is a flow chart showing the conventional image receiving interface switching to establish an AV link;
FIG. 3 is a schematic diagram of a conventional display circuit architecture employing a high-definition multimedia interface;
FIG. 4 is a flowchart of a method for switching audio/video receiving interfaces;
FIG. 5 is a block diagram of an embodiment of a circuit system for implementing a method for switching an audio/video receiving interface, and
Fig. 6 shows a flow chart of a fixed rate link training embodiment.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modifications and various other uses and applications, all of which are obvious from the description, without departing from the spirit of the invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another element or signal from another. In addition, the term "or" as used herein shall include any one or combination of more of the associated listed items as the case may be.
The disclosure provides a method and a circuit system for switching audio/video receiving interfaces, which can effectively save the image display time when a user switches the audio/video receiving interfaces by correcting the circuit and the operation method thereof, and can be applied to a framework in which a plurality of high-definition multimedia interface (HDMI) interfaces share a set of receiving circuits so as to achieve the purpose of minimizing the circuit design. The method is applicable to the operation of Fixed Rate Link (FRL) interfaces under the HDMI version 2.1.
According to the embodiment of the disclosure, the architecture of the set of high-definition multimedia interface (HDMI) interfaces for a set of circuits may refer to the circuit block embodiment diagram shown in fig. 5, wherein the technical key is an embodiment flowchart of a method for switching audio/video receiving interfaces as shown in fig. 4, and in the circuit system of the storage end device (sink), a circuit module 40 is disposed in a related circuit of the audio/video receiving interface, so as to operate the method for switching audio/video receiving interfaces. According to one embodiment, the circuit module 40 for performing the method may include a state and control data channel (status and control DATA CHANNEL, SCDC) control module 41 and a Fixed Rate Link (FRL) video packet detection module 42 implemented in circuitry, firmware, or in coordination with software.
It is noted that the Fixed Rate Link (FRL) has five fixed rates, such as 3/6/8/10/12GHz, for each audio/video receiving interface, and each audio/video receiving interface is provided with a Status and Control Data Channel (SCDC), because each audio/video source may use a different fixed rate, and thus the status and control data channels of different audio/video receiving interfaces may not be shared. In the method proposed in the disclosure, the storage device continuously responds to make the audio/video source continuously send out the fixed rate link signal, so that when the user switches to a specific audio/video source, the audio/video source is played again by detecting the fixed rate link signal and analyzing the audio/video packet.
According to an embodiment, in order to implement the method for switching the audio/video receiving interface provided by the disclosure, the circuit system in the storage device is modified, including modifying the firmware of the control module of the status and control data channel, so that the firmware can provide corresponding audio/video source continuous polling (polling) information, so that the audio/video source can continuously send information (such as an FRL signal) to the storage device when judging that the corresponding audio/video receiving interface in the storage device is continuously operating, so that when switching the audio/video receiving interface, the Fixed Rate Link (FRL) signal can be directly detected, and further, the audio/video data can be received, thereby successfully reducing the time spent when switching the audio/video receiving interface.
When a video signal line is used to connect the HDMI interface in the sink device with a video source (source), such as a network video platform, the sink device state and control data channel control module 41 communicates with the video source via a State and Control Data Channel (SCDC), and after handshake is completed, the fixed rate link training (FRL LINK TRAINING) mechanism is started. In the link training procedure, the storage device has one or more check points (such as LTP and GAP signals shown in fig. 6) to determine whether the fixed rate link signal sent by the audio/video source is correct, and the storage device firstly unconditionally replies the correct information of the audio/video source (source pass) at this time, so that the link training procedure can be completed, and the audio/video source sends the fixed rate link signal, and the flow embodiment is shown in the flow chart of the fixed rate link training embodiment in fig. 6. In the process, the storage device continuously responds to the State and Control Data Channel (SCDC) communication request proposed by the audio-video source, so that the audio-video source can continuously send out a fixed-rate link signal, and the storage device can continuously receive audio-video data. It is noted that the state in the circuit module 40 and the state processed by the control data channel control module 41 are communicated with the control data channel as a low-speed signal, so that the power consumption increased by maintaining the operation of the state and the control data channel is small.
When a user operates the remote controller to control the storage device and switches from the originally played interface to the HDMI interface to receive the related audio/video data, the audio/video source continuously sends out the fixed rate link signal, so that the audio/video packet detection module 42 can identify the signal, such as a gap packet (GAP PACKETS), in the energy-saving mode of the related audio/video processing chip on line, the fixed rate link audio/video packet detection module 42 is also a low power consumption mechanism, and the fixed rate link is rebuilt through the steps of signal detection, transmission rate determination of the fixed rate link, and packet determination of the fixed rate link, and after receiving the image data, the image starts to be played.
According to the flowchart of the method for switching the audio/video receiving interfaces shown in fig. 4, firstly, in step S401, connection lines between a plurality of audio/video receiving interfaces of the storage device and a plurality of audio/video sources are established, then in step S403, a user controls the storage device to play audio/video content of a certain source through a remote controller, at this time, in step S405, other audio/video sources other than the audio/video sources being played by the user can continuously respond to the state sent by the audio/video source and the communication request of the control data channel (SCDC) through the State and Control Data Channel (SCDC) control module 41, that is, continuously respond to the polling of the audio/video source, so that the audio/video source can continuously send out a Fixed Rate Link (FRL) signal according to the continuous response of the storage device, and the audio/video source can complete the link training.
Until the user switches the audio/video receiving interface in step S407, in step S409, the audio/video packet detecting module 42 starts to detect the transmission rate of the fixed rate link through the fixed rate link in the circuit module 40, and the received storage device parses the audio/video packet, and after parsing the packet, the transmission rate in the audio/video data or the audio/video resolution and other information can be obtained. In the storage device, the HDMI receiver should reset the parameters of the audio/video receiving interface circuit according to the determined transmission rate of the fixed rate link, so as to successfully convert the signal on the fixed rate link into a signal that can be resolved by the HDMI receiver. The two ends can transmit and receive data according to the rate information, one of the video sources of the switched video receiving interface connection line transmits video data through the fixed rate link, and the storage end device obtains video data from the video source of the switched video receiving interface connection line according to the obtained rate information, and then, in step S411, the video content starts to be played after decoding the video data.
It should be noted that, in the process shown in fig. 4, in order to save the time that it takes for the storage device to restart the link training to establish the data transmission channel through the hot plug switch and the audio/video source when the user switches the HDMI audio/video source, the circuitry for operating the method is configured to utilize the state and control data channel control module 41 to make the audio/video source continuously send out the Fixed Rate Link (FRL) signal when the HDMI audio/video signal line is connected to the audio/video source and the storage device until the user switches to the HDMI audio/video source, and then detect the fixed rate link signal through the fixed rate link audio/video packet detection module 42, and receive the audio/video data and play the audio/video content, the process of switching the audio/video receiving interface does not need to restart the link training process through the conventional hot plug switch.
According to the embodiment of the method for switching the audio/video receiving interface shown in fig. 4, the time for the storage device to restart the link training by the audio/video source through the hot plug switch to establish the data transmission channel can be saved, and how much time is saved depends on how long it takes to restart the link training after the audio/video source receives the hot plug switch.
The circuit system for implementing the method for switching the audio/video receiving interface can refer to the block schematic diagram of the embodiment shown in fig. 5.
In the figure, a storage device 50 is shown, which uses the same circuit to support multiple audio-visual receiving interfaces, such as HDMI, and the related circuit may also be HDMI, and each audio-visual receiving interface is connected to a respective processing circuit. The audio/video interfaces include the audio/video receiving interface a (501) and the audio/video receiving interface B (502) as shown in the drawings, in an embodiment, the above-mentioned circuit modules including the status and control data channel control module 41 and the fixed rate link audio/video packet detection module 42 are respectively provided, for example, the circuit modules 40a and 40B are respectively provided in the circuits of the audio/video receiving interfaces. In addition, the audio/video receiving interface a (501) and the audio/video receiving interface B (502) are connected to the shared communication protocol layer circuit, such as the audio/video interface protocol layer 520 shown in the figure, through a switching circuit 521 (such as a multiplexer) in addition to the audio/video interface physical layer a (511) and the audio/video interface physical layer B (512) circuit respectively connected. In one embodiment, the audio/video receiving interface a (501) and the audio/video receiving interface B (502) are respectively provided with a circuit module as set forth in the embodiment of fig. 4, and a state and control data channel control module (fig. 4, 41) and a fixed rate link audio/video packet detection module (fig. 4, 42) respectively. The state and control data channel control module receives the minimum operation current supplied by a power circuit (not shown) in the circuit system, and can still provide the audio-video source to poll and obtain information when the audio-video receiving interface (such as the main current) is closed by the storage end device. The storage device 50 is connected to different audio/video sources, such as audio/video source a (51) and audio/video source B (52), through audio/video receiving interface a (501) and audio/video receiving interface B (502) via audio/video signal lines 531 and 532, respectively.
It is mentioned that when the user is playing the video source a (51), the video receiving interface a (501), the video interface physical layer a (511), the switching circuit 521 and the video interface protocol layer 520 must be powered on, and the other circuits not being used, such as the video receiving interface B (502) and the video interface physical layer B (512), can be powered off. Conversely, when the user cuts from the video source a (51) to the video source B (52), the video receiving interface B (502) and the video interface physical layer B (512) must be powered, and then, because the state and control data channel control module (fig. 4 and 41) is continuously communicated with the video source B (52), the video source B (52) sends out a Fixed Rate Link (FRL) signal, and then, the fixed rate link video packet detection module (fig. 4 and 42) determines the transmission rate, so that the parameters of the video receiving interface B (502) and the video interface physical layer B (512) can be reset to obtain the video data sent by the video source B (52) according to the parameters.
Therefore, the operation of the state and control data channel control module can make the audio-video source continuously send out the fixed rate link signal, for example, when the user plays the audio-video content of the audio-video source A, the audio-video receiving interface B and the audio-video interface physical layer B can be closed, when the circuit system receives the signal of the audio-video source B switched by the user to the HDMI, the power supply is controlled to supply power to the audio-video receiving interface B and the audio-video interface physical layer B, then the fixed rate link signal from the audio-video source is detected by the fixed rate link audio-video packet detection module, and then the audio-video data is received, so that the audio-video interface protocol layer 520 is switched to the audio-video interface physical layer B by the switching circuit 521, and the purpose of receiving the data from different audio-video sources by using the same audio-video interface protocol layer 520 can be achieved, thereby achieving the purpose of minimizing the circuit design.
In the method for switching the audio/video receiving interface according to the disclosure, a Fixed Rate Link (FRL) training procedure is performed, the FRL procedure is applicable to the transmission mode defined by the HDMI 2.1 specification, and the transmitter of the audio/video source end and the receiver of the storage end must perform the link training (LINK TRAINING) before entering the FRL mode, and the related procedure can refer to the flowchart of the embodiment shown in fig. 6.
When the storage device is connected to the audio/video source through the audio/video signal line, the audio/video source and the storage device start the fixed rate link training procedure through the status and control data channel (step S601), and at the same time, the audio/video source and the storage device communicate with each other through the status and control data channel to establish a handshake procedure (handleshake) (step S603).
In the link training process, the storage device is provided with two check points to determine whether the incoming and outgoing signals are correct, the two check points comprise a link training pattern (LINK TRAINING PATTERN) packet and a gap pattern (GAP PATTERN) packet, that is, in a handshake process for performing a link training process between the video source and the storage device, a circuit system in the storage device can assign the video source to send a certain link training pattern as the purpose of two-end communication, and the gap pattern packet is used for the video source and the storage device to mutually compare the signal quality of a fixed-rate link.
In step S605, the av source sends out a link training graphics packet (LTP PACKET), and then in step S607, the storage device confirms that the link training graphics packet is received, thereby determining whether the fixed rate link signal sent by the av source is correct, and the storage device firstly unconditionally replies the correct (pass) information to the av source at this time, so that the link training can be completed to confirm the maximum transmission bandwidth between the links, and the av source can continue sending out the fixed rate link signal.
Then, in step S609, before transmitting the image data, the av source transmits the gap map packet (GAP PATTERN PACKETS) so that the av source can prepare the image data in this time, however, the time for transmitting the gap map packet depends on the time for the av source to prepare the image data, and in order not to miss the image data, in step S611, the storage device also unconditionally responds to the gap map packet to check the correct information, in step S613, through link training, thereby maintaining the state of the FRL link and waiting for the av source to transmit the image data. Finally, in step S615, the audio/video source outputs a fixed rate link signal, and the storage device receives audio/video data according to the rate information therein, and plays the audio/video content accordingly.
In summary, according to the method flow for switching the audio/video receiving interface and the circuit system for executing the method described in the above embodiments, the circuit system is designed as a circuit sharing the audio/video interface protocol layer, and is provided with a status and control data channel control module, wherein the Link Training Pattern (LTP) check and GAP pattern (GAP) check are unconditionally enabled to be correct, so that each audio/video source continuously sends out a fixed rate link signal, which can quickly respond to the audio/video content that the user wants to play, and then the transmission rate of the link signal is detected by the fixed rate link audio/video packet detection module to reset the HDMI interface and physical layer parameters, thereby obtaining the audio/video data, and playing the image content. The design of the circuit system can save the circuit area of a protocol layer circuit and the circuit area used in the circuit system, and a plurality of video and audio receiving interfaces can be connected with a plurality of video and audio sources at different fixed rates.
The above disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, so that all equivalent technical changes made by the specification and drawings of the present invention are included in the scope of the present invention.
[ Symbolic description ]
10 Accumulating end device
101. 102, 103 Power Domain
111 HDMI Port A
112 HDMI Port B
113 Display port
121. 122, 123 Video signal line
11A is the source of video and audio
12 Video source B
13 Video source C
30 Accumulating end device
301 HDMI Port A
302 HDMI Port B
311 HDMI physical layer A
312 HDMI physical layer B
321 HDMI protocol layer A
322 HDMI protocol layer B
331. 332 Video signal line
31A video source
32 Video source B
41 State and control data channel control module
42 Fixed rate link video packet detection module
40 Circuit module
50 Accumulating end device
501 Video-audio receiving interface A
502 Video-audio receiving interface B
511A physical layer of video/audio interface
512 Physical layer B of video/audio interface
520 Video/audio interface protocol layer
521 Switching circuit
531. 532 Video signal line
51 Video source A
52 Video source B
Step S201-S215 conventional process of switching image receiving interface to establish video connection
Steps S401-S411 the present invention switches the image receiving interface to establish the video connection flow
Step S601-S615 fixed rate link training process
Claims (9)
1. A method for switching audio/video receiving interface is executed in a circuit system, comprising:
When connecting a plurality of video sources and a plurality of video receiving interfaces in a storage end device, continuously responding to a communication request of a state and control data channel sent by the corresponding video source to the storage end device through a state and control data channel control module in the circuit system;
continuously transmitting a fixed rate link signal from the plurality of video sources in response to the status and control data channel control module, and
When the storage device is switched to one of the audio-video receiving interfaces, the fixed-rate link signal sent by one of the audio-video sources corresponding to the switched audio-video receiving interface is detected by a fixed-rate link audio-video packet detecting module in the circuit system, and a fixed-rate link is established with the switched audio-video receiving interface, so that the storage device obtains audio-video data from one of the audio-video sources connected with the audio-video receiving interface according to a transmission rate,
When the fixed-rate link signal sent by one of the video sources corresponding to the video receiving interface is detected, the video packet is analyzed to obtain the transmission rate of the video data.
2. The method of claim 1, wherein when the storage device is switched to one of the audio-video receiving interfaces, other audio-video sources that are not playing continuously respond to the state and control data channel communication request sent by each audio-video source through the state and control data channel control module, so that each audio-video source continuously sends out a fixed-rate link signal according to the continuous response of the storage device, and the storage device and each audio-video source complete the link training.
3. The method of claim 1, wherein after obtaining the transmission rate, resetting parameters of an audio-video receiving interface and an audio-video interface physical layer in the storage device to obtain the audio-video data through a fixed rate link.
4. A method for switching an audio/video receiving interface according to any one of claims 1 to 3, wherein the information continuously obtained by the audio/video sources through the corresponding status and control data channel control module includes one or more checkpoints set by the storage device in the status and control data channel control module.
5. The method according to claim 4, wherein the check point comprises a link training graphics packet and a gap graphics packet.
6. The method according to claim 4, wherein the storage device unconditionally replies correct information from the multiple video sources, so that the link training can be performed and the multiple video sources can continue to send out the fixed rate link signal.
7. The circuit system is applied to a storage end device, a plurality of video and audio receiving interfaces in the storage end device are connected with a plurality of video and audio sources, and the circuit system comprises:
a state and control data channel control module for communicating with corresponding audio/video sources via a state and control data channel and providing the corresponding audio/video sources with polling information thereof, so that the audio/video sources can determine that the corresponding audio/video receiving interfaces in the storage device are in continuous operation;
A fixed rate link video packet detection module for reconstructing a fixed rate link by signal detection, transmission rate determination of the fixed rate link, and fixed rate link packet determination;
The circuit system executes a method for switching the video-audio receiving interface, which comprises the following steps:
when a plurality of video sources are connected with a plurality of video receiving interfaces in the storage end device, the state and control data channel communication requirements sent to the storage end device by the video sources corresponding to the continuous response of the state and control data channel control module are met;
continuously transmitting a fixed rate link signal from the plurality of video sources in response to the corresponding status and control data channel control module, and
When the storage device is switched to one of the audio-video receiving interfaces, the fixed-rate link signal sent by one of the audio-video sources corresponding to the switched audio-video receiving interface is detected by the fixed-rate link audio-video packet detecting module, and a transmission rate is obtained by analysis, so that the fixed-rate link is established with the switched audio-video receiving interface, and the storage device obtains audio-video data from one of the audio-video sources connected with the audio-video receiving interface according to the transmission rate.
8. The circuit system of claim 7, wherein the plurality of video receiving interfaces share a video interface protocol layer through a switching circuit in addition to being each connected to a video interface physical layer.
9. The circuit system of claim 8, wherein the physical layer of the video interface corresponding to the video receiving interface, the switching circuit and the common video interface protocol layer are powered on, and the other video receiving interfaces and video interface physical layers not in use are powered off.
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| CN108702466A (en) * | 2016-03-02 | 2018-10-23 | 美国莱迪思半导体公司 | Link training in multimedia interface |
| CN111954061A (en) * | 2019-05-17 | 2020-11-17 | 三星电子株式会社 | Electronic equipment and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108702466A (en) * | 2016-03-02 | 2018-10-23 | 美国莱迪思半导体公司 | Link training in multimedia interface |
| CN111954061A (en) * | 2019-05-17 | 2020-11-17 | 三星电子株式会社 | Electronic equipment and control method thereof |
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