CN106604097B - Method and system for transmitting multiple video signals - Google Patents
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
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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
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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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
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Abstract
The invention relates to a method and a system for transmitting multi-channel video signals. The transmission method of the multi-channel video signal comprises the following steps: respectively carrying out digital processing on each channel of video signals to be transmitted to obtain multiple channels of digital video data; acquiring the frame rate ratio of each path of digital video data; sampling frame data from each path of digital video data alternately according to the frame number ratio to fill a time slot of a transmission link, and obtaining a synthetic video signal corresponding to each path of digital video data; transmitting the synthesized video signal to a decoding unit, performing demultiplexing processing on the synthesized video signal at the decoding unit, and decomposing the synthesized video signal into each path of digital video data; respectively sending each path of digital video data to a display window corresponding to each path of digital video data in a display interface; the cost of simultaneously transmitting multiple paths of video signals by the intelligent display equipment is effectively reduced.
Description
Technical Field
The present invention relates to the field of video signal processing technologies, and in particular, to a method and a system for transmitting multiple channels of video signals.
Background
An intelligent display device, especially a multi-screen display device, generally has multiple signal display functions, such as a video signal playback function and a preview function; that is, the processor (e.g., Ark5000, etc.) of the intelligent display device may control a signal to preview on its display interface, and control a signal to show back on the corresponding display interface, and the processor may also control other signals to perform other display operations on the display interface. Because each set of streaming media device (limited number of video card lines) of the processor of the intelligent display device usually transmits only one video code stream, under such a condition, the intelligent display device is difficult to perform corresponding display (such as playback and preview of different video signals) on a display interface of the intelligent display device for multiple paths of video signals at the same time; for example, Ark5000, although having both playback and mode preview functions, is limited by the limited hardware devices, Ark5000 processor can only output playback video signals or preview video signals to the corresponding displays at the same time, which can cause the video stream of the a user to be confused if the a user is watching a desktop playback, while the B user requests a mode preview from the processor.
According to the traditional scheme, the streaming media devices are additionally arranged on a processor of the intelligent device (for example, the number of display cards of the processor is increased), and the transmission of multiple paths of video signals is realized at the same time through the multiple streaming media devices, so that the corresponding intelligent processing devices can simultaneously carry out multiple displays on different video signals.
Disclosure of Invention
Based on this, it is necessary to provide a method and a system for transmitting multiple video signals, aiming at the technical problem that the conventional scheme has high cost for realizing the transmission scheme of multiple video signals at the same time by using multiple streaming media devices.
A method for transmitting a plurality of video signals, comprising the steps of:
respectively carrying out digital processing on each channel of video signals to be transmitted to obtain multiple channels of digital video data;
acquiring the frame rate ratio of each path of digital video data;
sampling frame data from each path of digital video data alternately according to the frame number ratio to fill a time slot of a transmission link, and obtaining a synthetic video signal corresponding to each path of digital video data;
transmitting the synthesized video signal to a decoding unit, performing demultiplexing processing on the synthesized video signal at the decoding unit, and decomposing the synthesized video signal into each path of digital video data;
and respectively sending each path of digital video data to a display window corresponding to each path of digital video data in the display interface.
A transmission system for multiple video signals, comprising:
the digital processing module is used for respectively carrying out digital processing on each channel of video signals to be transmitted to obtain multiple channels of digital video data;
the acquisition module is used for acquiring the frame rate of each path of digital video data;
the filling module is used for alternately sampling frame data from each path of digital video data according to the frame number ratio to fill a time slot of a transmission link so as to obtain a composite video signal corresponding to each path of digital video data;
the decomposition module is used for transmitting the synthesized video signal to a decoding unit, and the decoding unit is used for carrying out de-multiplexing processing on the synthesized video signal and decomposing the synthesized video signal into various paths of digital video data;
and the sending module is used for respectively sending each path of digital video data to a display window corresponding to each path of digital video data in the display interface.
The transmission method and the system of the multi-channel video signals can convert the video signals into corresponding digital video data, sample frame data from the digital video data alternately according to the frame number ratio among the digital video data to fill a time slot of a transmission link, combine the digital video data into a composite video signal, and transmit the composite video signal to a decoding unit through limited streaming media equipment in intelligent display equipment, so that the composite video signal can be decoded into the corresponding digital video data in the decoding unit, thereby realizing the transmission of the multi-channel digital video data on the limited streaming media equipment in the intelligent display equipment at the same time, and effectively reducing the cost of the intelligent display equipment for simultaneously transmitting the multi-channel video signals.
Drawings
FIG. 1 is a flow chart of a method for transmitting multiple video signals according to one embodiment;
FIG. 2 is a schematic diagram of an alternate sampling and demultiplexing process of frame data according to one embodiment;
FIG. 3 is a schematic diagram of an alternate sampling and demultiplexing process for frame data according to one embodiment;
fig. 4 is a schematic diagram of a transmission system of multiple video signals according to an embodiment.
Detailed Description
The following describes in detail a specific embodiment of the method and system for transmitting multiple video signals according to the present invention with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flow chart of a transmission method of multiple video signals according to an embodiment, which includes the following steps:
s10, respectively carrying out digital processing on each channel of video signals to be transmitted to obtain multiple channels of digital video data;
the video signal may include a display instruction input by a user to the intelligent display device, a video signal to be displayed (for example, a video signal to be previewed or a video signal that appears after being brought back) generated by the intelligent display device according to the display instruction input by the user, a video signal input by the user to the intelligent display device through an external storage device, and the like. The above steps can respectively carry out digital processing on the signal components of the luminance signal (Y), the red difference signal (R-Y), the blue difference signal (B-Y) and the like in each path of video signal to obtain the digital video data corresponding to the corresponding video signal.
S20, obtaining the frame ratio of each path of digital video data;
the above steps may be performed by obtaining how many frames of frame data (image frame data) each path of digital video data includes, and calculating the frame number ratio of each path of digital video data according to the number of frames of frame data included in each path of digital video data. If the digital video data is 2 paths, and the number of frame data contained in each path of digital video data is equal, the number of frame data of each path of digital video data is 1: 1; if the digital video data is 2 paths, and the frame number of the frame data contained in the first path of digital video data is 2 times of the frame number of the frame data contained in the second path of digital video data, the frame number ratio of each path of digital video data is 2: 1.
S30, sampling frame data from each path of digital video data alternately according to the frame number ratio to fill the time slot of the transmission link, and obtaining a composite video signal corresponding to each path of digital video data;
in the above step, one frame of data is sampled at a time from the digital video data to fill one slot of the transmission link. For a path of digital video data, the digital video data may be collected according to a clock sequence of each frame data in the digital video data, for example, if frame data in a first path of digital video data needs to be sampled, a first frame data of the first path of digital video data is sampled first, and then in a sampling process of the path of digital video data, a second frame data, a third frame data, and the like of the first path of digital video data are sampled sequentially according to a corresponding clock sequence.
The above steps also require that the time slot of the transmission link is filled with sampled frame data from each path of digital video data alternately according to the frame number ratio of each path of digital video data. As shown in fig. 2, fig. 2 shows 3-way digital video data: the method comprises the steps that digital video data A (A1A2A3 …), digital video data B (B1B2B3 …) and digital video data C (C1C2C3 …), the number of frame data contained in each path of digital video data is equal, the corresponding frame ratio is 1:1:1, in the process of alternately sampling frame data from each path of digital video data to fill a time slot of a transmission link, first frame data in each path of digital video data can be respectively sampled to fill the corresponding time slot, then second frame data in each path of digital video data are sampled and filled, and the cycle is performed until all the frame data in each path of digital video data are filled in the time slot of the transmission link; as shown in fig. 2, the first frame data A1 may be sampled from the digital video data a to fill the first time slot of the transmission link, the first frame data B1 may be sampled from the digital video data B to fill the second time slot of the transmission link, the first frame data C1 may be sampled from the digital video data C to fill the third time slot of the transmission link, and then the second frame data of each channel of digital video data may be sampled (the second frame data A2, B2, and C2 are sequentially used from the digital video data a, the digital video data B, and the digital video data C) and filled, and the process is repeated until all the frame data of the 3 channels of digital video data are completely filled into the time slot of the transmission link, so as to obtain the composite video signal A1B1C1A2B2C2 …. Fig. 3 shows 2-way digital video data: digital video data D (D1D2D3D4) and digital video data E (E1E2), wherein the digital video data D includes 4 frames of data D1, D2, D3 and D4, the digital video data E includes 2 frames of data E1 and E2, and the frame ratio of the digital video data D and the digital video data E is 2:1, in the process of alternately sampling the frame data from each path of digital video data to fill the slot of the transmission link, first frame data a1 can be sampled from the digital video data D to fill the first slot of the transmission link, second frame data D2 can be sampled from the digital video data D to fill the second slot of the transmission link, then the first frame data E1 can be sampled from the digital video data E to fill the third slot of the transmission link, the first sampling of the digital video data D and the digital video data E is completed, and then the next sampling of the digital video data D and the digital video data E is started (two sampling of the digital video data D is started first from the digital video data D to fill the first slot of the transmission link Accordingly, the first frame of data is sampled from the digital video data E), and the process is repeated until all the frame data in the digital video data D and the digital video data E fill the time slot of the transmission link, so as to obtain the composite video signal D1D2E1D3D4E 2.
S40, transmitting the composite video signal to a decoding unit, carrying out de-multiplexing processing on the composite video signal in the decoding unit, and decomposing the composite video signal into each path of digital video data;
the above steps transmit the composite video signal to a decoding unit, and the transmission of the corresponding multi-channel digital video data is realized by transmitting one channel of the composite video signal, and after the composite video signal is transmitted to the decoding unit, the composite video signal can be subjected to demultiplexing processing in the decoding unit to obtain each channel of digital video data. As shown in fig. 2, the composite video signal A1B1C1A2B2C2 … is demultiplexed to obtain 3 channels of digital video data corresponding thereto: digital video data a (A1A2a3 …), digital video data B (B1B2B3 …), digital video data C (C1C2C3 …), so as to convert the above-mentioned 3-way digital video data: and the digital video data A, the digital video data B and the digital video data C are respectively sent to a display interface to realize corresponding display. As shown in fig. 3, the composite video signal D1D2E1D3D4E2 is demultiplexed to obtain 2 channels of digital video data corresponding thereto: digital video data D (D1D2D3D4) and digital video data E (E1E2), and subsequent transmission and processing of the digital video data D (D1D2D3D4) and digital video data E (E1E2) are performed.
And S50, sending each path of digital video data to a display window corresponding to each path of digital video data in the display interface.
The transmission method of the multi-channel video signal provided by the invention can convert the video signal into the corresponding digital video data, alternately sample frame data from the digital video data according to the frame number ratio among all the channels of digital video data to fill the time slot of the transmission link, combine all the channels of digital video data into a channel of composite video signal, and transmit the channel of composite video signal to the decoding unit through the limited streaming media equipment in the intelligent display equipment, so that the composite video signal can be decoded into the corresponding digital video data in the decoding unit, thereby realizing the transmission of the multi-channel digital video data on the limited streaming media equipment in the intelligent display equipment at the same time, and effectively reducing the cost of the intelligent display equipment for simultaneously transmitting the multi-channel video signals.
In an embodiment, the above process of alternately sampling frame data from each path of digital video data to fill a time slot of a transmission link according to the frame ratio to obtain a composite video signal corresponding to each path of digital video data may include:
setting the acquisition sequence of each path of digital video data according to the frame number ratio; the ratio of the acquisition times of each path of digital video data in one round of acquisition is equal to the frame number ratio;
sequentially acquiring frame data from each path of digital video data according to the acquisition sequence and filling the frame data into the time slot of the transmission link; acquiring one frame of frame data in digital video data at a time, wherein each frame of data in the digital video data is acquired according to the time sequence of the frame data in the digital video data;
after a round of frame data is collected in each path of digital video data according to the collection sequence, the process of collecting the frame data from each path of digital video data in sequence according to the collection sequence and filling the frame data into the time slot of the transmission link is repeatedly executed until all the frame data in each path of digital video data are completely filled into the time slot of the transmission link.
In this embodiment, acquiring a round of frame data of each path of digital video data requires acquiring frame data of each path of digital video data, for example, acquiring a frame of data of each path of digital video data, or acquiring several frames of data of a first path of digital video data first, and then acquiring a frame of data of each other path of digital video data, and so on. In any round of acquisition process of each path of digital video data, the ratio of the acquisition times of each path of digital video data is equal to the frame number ratio.
In an embodiment, the above process of alternately sampling frame data from each path of digital video data to fill a time slot of a transmission link according to the frame ratio and the transmission frame rate may include:
if the number of frames of each path of digital video data is equal, setting the acquisition sequence of each path of digital video data;
collecting first frame data of each path of digital video data according to the collection sequence and filling the first frame data into a time slot of a transmission link in sequence;
after the first frame data of each path of digital video data is collected, respectively collecting the next frame data in each path of digital video data according to the collecting sequence and sequentially filling the next frame data into the time slot of the transmission link;
and repeating the process of collecting the next frame of frame data in each path of digital video data and filling the frame data into the time slot of the transmission link in sequence according to the collecting sequence until all the frame data in each path of digital video data are filled into the time slot of the transmission link.
The embodiment can ensure the orderliness in the process of filling the time slot of the transmission link with the sampled frame data from each path of digital video data so as to improve the accuracy of the generated composite video signal.
In an embodiment, the step of alternately sampling frame data from each path of digital video data according to the frame number ratio to fill a time slot of a transmission link to obtain a composite video signal corresponding to each path of digital video data may further include:
setting a type label of any frame data in each path of digital video data; the type label records the type of the digital video data corresponding to the frame data; the type labels correspond to the digital video data one by one, and any path of digital video data has a unique corresponding type label;
the process of performing demultiplexing processing on the composite video signal at the decoding unit and decomposing the composite video signal into each path of digital video data comprises the following steps:
performing demultiplexing processing on the synthesized video signal at the decoding unit to obtain frame data of each frame included in the synthesized video signal;
and respectively identifying the type label of each frame of data, and synthesizing the frame data with the same type label into a path of digital video data.
In this embodiment, the frame data with the same type tag is synthesized into the digital video data corresponding to the type tag, so that the accuracy of the obtained digital video data is ensured.
As an embodiment, the frame data may carry a clock tag; in any path of digital video data, the clock sequence of the clock label is consistent with the arrangement sequence of each frame data in the corresponding digital video data.
The clock tag may characterize the clock order of its corresponding frame data in the corresponding digital video data.
As an embodiment, the process of synthesizing the frame data with the same type tag into a single digital video data may include:
respectively identifying clock tags carried by frame data with the same type tags;
and synthesizing the frame data with the same type label into a path of digital video data according to the clock sequence in the clock label.
In this embodiment, the corresponding digital video data is synthesized according to the clock sequence in the clock tag, so that the arrangement sequence of the frame data in the synthesized digital video data in the digital video data is consistent with the sequence of the frame signals in the corresponding original video signal.
In an embodiment, the process of sending each path of digital video data to a display window corresponding to each path of digital video data in a display interface respectively may include:
respectively creating display windows corresponding to each path of digital video data on a display interface;
and respectively sending each path of digital video data to a corresponding display window for displaying.
The embodiment can realize the display of each path of digital video data on the corresponding display interface, and has lower cost.
In one embodiment, the video signals include a playback video signal and a preview video signal; the playback video signal is video content which is generated by the processor according to the playback instruction and is used for playback on the display interface; the preview video signal is video content which is generated by the processor according to the preview instruction and is used for previewing on the display interface.
According to the embodiment, when the stream media equipment is not additionally arranged, the intelligent display equipment can simultaneously realize the preview and the playback of different signals, and the cost of the intelligent display equipment for simultaneously realizing the preview and the playback of two display functions is effectively reduced.
In an embodiment, the process of respectively performing digital processing on each channel of video signals to be transmitted includes:
and respectively carrying out digital processing on the brightness signal, the red difference signal and the blue difference signal in any one path of video signal, and generating digital video data corresponding to the path of video signal according to the brightness signal, the red difference signal and the blue difference signal after the digital processing.
The digitization processing process provided by the embodiment can accurately perform relatively complete digitization processing on each path of video signal.
In one embodiment, taking Ark5000 full-color tv signals in a processor as an example, the brightness signal (Y), the red difference signal (R-Y), and the blue difference signal (B-Y) in the full-color tv signals may be digitized separately, then the components may be digitized by time division multiplexing (multiplexing the three separately digitized signals in a certain way), the brightness signal and the two color difference signals may be digitized separately, and then the digitized height and color difference signals may be arranged into a code stream.
In generating the composite video signal, the acquisition frame rate may be dynamically allocated according to a number of connection ratio requested by the playback function and the mode preview function, assuming Ark5000 that the maximum frame rate of each streaming media device of the 5000 processors is 60 fps. If the intelligent display device (such as a tiled wall) requests the playback function or only the mode preview function, then the processor 60 frame acquisition is either tiled wall playback or mode preview. If a channel of splicing wall echo function request and a channel of mode preview function request exist at this time, 60 frames of acquisition signals (acquisition card frame 1 acquisition echo signal, frame 2 acquisition mode preview signal, frame 3 acquisition echo signal …, alternate acquisition …, frame 59 acquisition echo signal, frame 60 acquisition mode preview signal) are equally divided, if two channels of splicing wall echo function requests and a channel of mode preview function request exist at this time (acquisition card frame 1 acquisition echo signal, frame 2 acquisition mode echo signal, frame 3 acquisition mode preview signal, frame 4 acquisition echo signal …, alternate acquisition …, frame 58 acquisition echo signal, frame 59 acquisition echo signal, frame 60 acquisition mode preview signal). And dynamically allocating the acquisition frame rate according to the number of the connection ratio requested by the echoing function and the mode preview function.
The processor of the intelligent display device can transmit video signals by using asynchronous time division multiplexing, the echo signals and the mode preview signals are combined for transmission by using the asynchronous time division multiplexing principle, and a receiving end (such as a decoding box, a decoding unit or a software decoding client) performs data processing on each path of demultiplexed signals to obtain splicing wall echo information and mode preview information, so that Ark5000 processor multipoint function real-time series operation monitoring output is realized.
The entire transmission time is divided into time intervals, also called time slots, which do not overlap with each other. The time division multiplexing technology allocates the time slots to each signal source for use, and each time slot can only be occupied by one path of signal. Time division multiplexing enables a circuit to carry multiple signals by sending portions of each signal across time. Only one signal is present at each brief moment on the circuit. Asynchronous time division multiplexing is a time division multiplexing technology for dynamically allocating channel resources according to actual needs of users. The asynchronous time division multiplexing technology divides the data of users into data units, the data units of different users still share channels according to a time division mode, but time slots can be dynamically allocated according to the requirements of the users, so that idle time slots are avoided in each frame.
According to the embodiment, Ark5000 and other intelligent display equipment can be limited and realized by limited hardware equipment, and a processor of the intelligent display equipment can provide the splicing wall back display function and the mode preview function for multifunctional acquisition output. The use of multiple-path gas multiplexing can reduce the cost of a single processor. The embodiment utilizes a flexible dynamic frame adjusting method, can dynamically and effectively balance and process signal acquisition according to the requirements of real users, and furthest exerts the media fluid processing function of the processor.
Referring to fig. 4, fig. 4 is a schematic diagram of a transmission system of multiple video signals according to an embodiment, including:
the digital processing module 10 is configured to perform digital processing on each channel of video signals to be transmitted respectively to obtain multiple channels of digital video data;
an obtaining module 20, configured to obtain a frame ratio of each channel of digital video data;
a filling module 30, configured to alternately sample frame data from each path of digital video data according to the frame number ratio and fill a time slot of a transmission link with the sampled frame data to obtain a composite video signal corresponding to each path of digital video data;
a decomposition module 40, configured to transmit the composite video signal to a decoding unit, where the decoding unit performs a de-multiplexing process on the composite video signal, and decomposes the composite video signal into each channel of digital video data;
and the sending module 50 is configured to send each path of digital video data to a display window corresponding to each path of digital video data in the display interface.
The transmission system of the multiple video signals provided by the invention corresponds to the transmission method of the multiple video signals provided by the invention one by one, and the technical characteristics and the beneficial effects described in the embodiment of the transmission method of the multiple video signals are all applicable to the embodiment of the transmission system of the multiple video signals, so that the statement is made.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for transmitting multiple video signals, comprising the steps of:
respectively carrying out digital processing on each channel of video signals to be transmitted to obtain multiple channels of digital video data;
acquiring the frame rate ratio of each path of digital video data;
sampling frame data from each path of digital video data alternately according to the frame number ratio to fill a time slot of a transmission link, and obtaining a synthetic video signal corresponding to each path of digital video data;
transmitting the synthesized video signal to a decoding unit, performing demultiplexing processing on the synthesized video signal at the decoding unit, and decomposing the synthesized video signal into each path of digital video data;
respectively sending each path of digital video data to a display window corresponding to each path of digital video data in a display interface;
the process of alternately sampling frame data from each path of digital video data according to the frame number ratio to fill the time slot of the transmission link to obtain the synthetic video signal corresponding to each path of digital video data comprises the following steps:
if the number of frames of each path of digital video data is not equal, setting the acquisition sequence of each path of digital video data according to the number of frames; the ratio of the acquisition times of each path of digital video data in one round of acquisition is equal to the frame number ratio;
sequentially acquiring frame data from each path of digital video data according to the acquisition sequence and filling the frame data into the time slot of the transmission link; acquiring one frame of frame data in digital video data at a time, wherein each frame of data in the digital video data is acquired according to the time sequence of the frame data in the digital video data;
after a round of frame data is collected in each path of digital video data according to the collection sequence, the process of collecting the frame data from each path of digital video data in sequence according to the collection sequence and filling the frame data into the time slot of the transmission link is repeatedly executed until all the frame data in each path of digital video data are completely filled into the time slot of the transmission link.
2. The method according to claim 1, wherein said step of alternately sampling frame data from each digital video data according to the frame rate ratio and the transmission frame rate to fill the time slots of the transmission link comprises:
if the number of frames of each path of digital video data is equal, setting the acquisition sequence of each path of digital video data;
collecting first frame data of each path of digital video data according to the collection sequence and filling the first frame data into a time slot of a transmission link in sequence;
after the first frame data of each path of digital video data is collected, respectively collecting the next frame data in each path of digital video data according to the collecting sequence and sequentially filling the next frame data into the time slot of the transmission link;
and repeating the process of collecting the next frame of frame data in each path of digital video data and filling the frame data into the time slot of the transmission link in sequence according to the collecting sequence until all the frame data in each path of digital video data are filled into the time slot of the transmission link.
3. The method for transmitting multiple video signals according to claim 1,
the step of alternately sampling frame data from each path of digital video data according to the frame number ratio to fill the time slot of the transmission link to obtain a composite video signal corresponding to each path of digital video data further comprises:
setting a type label of any frame data in each path of digital video data; the type label records the type of the digital video data corresponding to the frame data;
the process of performing demultiplexing processing on the composite video signal at the decoding unit and decomposing the composite video signal into each path of digital video data comprises the following steps:
performing demultiplexing processing on the synthesized video signal at the decoding unit to obtain frame data of each frame included in the synthesized video signal;
and respectively identifying the type label of each frame of data, and synthesizing the frame data with the same type label into a path of digital video data.
4. The method according to claim 3, wherein the frame data carries a clock tag; in any path of digital video data, the clock sequence of the clock label is consistent with the arrangement sequence of each frame data in the corresponding digital video data.
5. The method according to claim 4, wherein said synthesizing the frame data with the same type tag into a digital video data comprises:
respectively identifying clock tags carried by frame data with the same type tags;
and synthesizing the frame data with the same type label into a path of digital video data according to the clock sequence in the clock label.
6. The method for transmitting multiple channels of video signals according to any one of claims 1 to 5, wherein the process of respectively sending each channel of digital video data to a display window corresponding to each channel of digital video data in a display interface comprises:
respectively creating display windows corresponding to each path of digital video data on a display interface;
and respectively sending each path of digital video data to a corresponding display window for displaying.
7. The method for transmitting multiple video signals according to any one of claims 1 to 5, wherein the video signals include a playback video signal and a preview video signal; the playback video signal is video content which is generated by the processor according to the playback instruction and is used for playback on the display interface; the preview video signal is video content which is generated by the processor according to the preview instruction and is used for previewing on the display interface.
8. The method according to any one of claims 1 to 5, wherein the step of digitizing the video signals to be transmitted separately comprises:
and respectively carrying out digital processing on the brightness signal, the red difference signal and the blue difference signal in any one path of video signal, and generating digital video data corresponding to the path of video signal according to the brightness signal, the red difference signal and the blue difference signal after the digital processing.
9. A transmission system for multiple video signals, comprising:
the digital processing module is used for respectively carrying out digital processing on each channel of video signals to be transmitted to obtain multiple channels of digital video data;
the acquisition module is used for acquiring the frame rate of each path of digital video data;
the filling module is used for alternately sampling frame data from each path of digital video data according to the frame number ratio to fill a time slot of a transmission link so as to obtain a composite video signal corresponding to each path of digital video data;
the decomposition module is used for transmitting the synthesized video signal to a decoding unit, and the decoding unit is used for carrying out de-multiplexing processing on the synthesized video signal and decomposing the synthesized video signal into various paths of digital video data;
the sending module is used for respectively sending each path of digital video data to a display window corresponding to each path of digital video data in a display interface;
the process of alternately sampling frame data from each path of digital video data according to the frame number ratio to fill the time slot of the transmission link to obtain the synthetic video signal corresponding to each path of digital video data comprises the following steps:
if the number of frames of each path of digital video data is not equal, setting the acquisition sequence of each path of digital video data according to the number of frames; the ratio of the acquisition times of each path of digital video data in one round of acquisition is equal to the frame number ratio;
sequentially acquiring frame data from each path of digital video data according to the acquisition sequence and filling the frame data into the time slot of the transmission link; acquiring one frame of frame data in digital video data at a time, wherein each frame of data in the digital video data is acquired according to the time sequence of the frame data in the digital video data;
after a round of frame data is collected in each path of digital video data according to the collection sequence, the process of collecting the frame data from each path of digital video data in sequence according to the collection sequence and filling the frame data into the time slot of the transmission link is repeatedly executed until all the frame data in each path of digital video data are completely filled into the time slot of the transmission link.
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