CN115065858A - Audio and video transmission method and system based on double optical fibers - Google Patents
Audio and video transmission method and system based on double optical fibers Download PDFInfo
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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
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/038—Arrangements for fault recovery using bypasses
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
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Abstract
The invention discloses an audio and video transmission method and system based on double optical fibers, the method ensures the quality of images and audio by carrying out lossless compression-free coding on input audio and video data, copies two paths of identical video coding data on the obtained audio and video coding data, and sends the two paths of video coding data to audio and video decoding equipment based on double optical fibers; and after the audio and video decoding equipment receives the two paths of audio and video coding data, detecting the link states of the main link and the standby link in real time, and selecting the main audio and video coding data corresponding to the main link to perform decoding processing when the main link is recovered to be normal: when the main link is abnormal, the automatic switching is carried out to the standby link, the automatic detection of the abnormality is realized, the automatic switching is carried out to the standby link, the seamless switching in the switching process is realized, the condition of audio and video interruption is avoided, and the transmission reliability is ensured.
Description
Technical Field
The invention relates to the technical field of big data, in particular to an audio and video transmission method and system based on double optical fibers.
Background
With the rapid development of automation and science and technology, the requirements of people on audio and video transmission display, intelligent control and security monitoring are continuously strengthened, and besides the requirement of basic functions is met, the requirements of people also gradually pay attention to the synchronization of audio and video, the quality of audio and video, the transmission distance of audio and video, the reliability of audio and video transmission and the like.
The network transmission method comprises the steps that audio and video lossy compression is carried out on input audio and video data through an HDMI (high-definition multimedia interface) line and a 3.5mm line by encoding end equipment, the audio and video lossy compression is carried out on the input audio and video data through the HDMI line and the 3.5mm line, the audio and video data are transmitted to a decoding end through a network packet mode by taking the single network line as a transmission medium, the decoding end decodes the network packet, and audio and video streams are transmitted to display equipment through the HDMI line and the 3.5mm line after being decoded. The processing system greatly reduces the quality of audio and video in the transmission process due to lossy compression of data, the transmission distance of network cables is limited, and when the network cables are damaged or the network is unstable, a decoding end cannot correctly decode audio and video streams, so that the audio and video output is abnormal.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the audio and video transmission method and system based on the double optical fibers are provided, and the audio and video transmission stability is improved.
In order to solve the technical problem, the invention provides an audio and video transmission method based on dual optical fibers, which comprises the following steps:
controlling audio and video coding equipment to code the acquired audio and video data to obtain audio and video coding data, copying the audio and video coding data to obtain first audio and video coding data and second audio and video coding data, and sending the first audio and video coding data and the second audio and video coding data to audio and video decoding equipment based on double optical fibers;
controlling audio and video decoding equipment to receive the first audio and video coding data and the second audio and video coding data, setting the first audio and video coding data as main audio and video coding data, and setting the second audio and video coding data as standby audio and video coding data;
acquiring a main link state corresponding to the main audio and video coded data and a standby link state corresponding to the standby audio and video coded data, and judging whether the main link state and the standby link state are abnormal in real time;
when the state of the main link is normal, decoding the main audio and video coded data; and when the main link state is abnormal and the standby link state is normal, switching the main audio and video coding data into the standby audio and video coding data, decoding the standby audio and video coding data until audio and video decoding data are generated, and outputting the audio and video data.
In a possible implementation manner, the sending the first audio/video encoding data and the second audio/video encoding data to an audio/video decoding device based on a dual optical fiber specifically includes:
controlling a high-speed interface sending processing module in audio and video coding equipment to respectively send the first audio and video coding data and the second audio and video coding data to a corresponding first coding end optical module and a corresponding second coding end optical module so that the first coding end optical module and the second coding end optical module send the first audio and video coding data and the second audio and video coding data to a first decoding end optical module and a second decoding end optical module in audio and video decoding equipment based on double optical fibers;
and a high-speed interface receiving processing module in the audio and video decoding equipment is controlled to receive the first audio and video coding data and the second audio and video coding data in the first decoding end optical module and the second decoding end optical module.
In a possible implementation manner, the determining whether the state of the main link and the state of the standby link are abnormal in real time specifically includes:
acquiring a first decoding state indicating signal corresponding to the primary audio and video coded data, and comparing the first decoding state indicating signal with a preset decoding abnormal state indicating signal;
if the first decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, the link state corresponding to the primary audio and video coded data is considered to be abnormal, otherwise, the link corresponding to the primary audio and video coded data is considered to be normal;
acquiring a second decoding state indicating signal corresponding to the standby audio and video coded data, and comparing the second decoding state indicating signal with a preset decoding abnormal state indicating signal;
and if the second decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, considering that the link state corresponding to the standby audio and video coded data is abnormal, otherwise, considering that the link corresponding to the standby audio and video coded data is normal.
In a possible implementation manner, the method for controlling the audio/video encoding device to encode the acquired audio/video data to obtain audio/video encoded data specifically includes:
acquiring sound source data in audio source equipment, and setting a sound source indication label for the sound source data to obtain audio coded data;
acquiring video data in video source equipment, and setting a video indication label for the video data; video coding data is obtained.
In a possible implementation manner, the audio/video encoding data is copied to obtain first audio/video encoding data and second audio/video encoding data, and the method specifically includes:
monitoring the video buffer amount in a video buffer queue and the audio buffer amount in an audio buffer queue in real time, and comparing the video buffer amount with the audio buffer amount;
when the video buffer amount is larger than or equal to the audio buffer amount, firstly reading the video coding data in the video buffer queue, and copying the video coding data into the same first video coding data and second video coding data;
when the video buffer amount is smaller than the audio buffer amount, the audio coding data in the audio buffer queue are read first, and the audio coding data are copied into the same first audio coding data and second audio coding data.
The invention also provides an audio and video transmission system based on the double optical fibers, which comprises the following components: audio and video coding equipment and audio and video decoding equipment;
the audio and video coding device is used for coding the acquired audio and video data to obtain audio and video coding data, copying the audio and video coding data to obtain first audio and video coding data and second audio and video coding data, and sending the first audio and video coding data and the second audio and video coding data to the audio and video decoding device based on double optical fibers;
the audio and video decoding device is used for receiving the first audio and video coding data and the second audio and video coding data, setting the first audio and video coding data as main audio and video coding data, and setting the second audio and video coding data as standby audio and video coding data;
the audio and video decoding device is further configured to acquire a main link state corresponding to the main audio and video coded data and a standby link state corresponding to the standby audio and video coded data, and determine whether the main link state and the standby link state are abnormal in real time;
the audio and video decoding equipment is also used for decoding the main audio and video coded data when the main link state is normal; and when the main link state is abnormal and the standby link state is normal, switching the main audio and video coding data into the standby audio and video coding data, decoding the standby audio and video coding data until audio and video decoding data are generated, and outputting the audio and video data.
In a possible implementation manner, the audio/video encoding device is configured to send the first audio/video encoding data and the second audio/video encoding data to an audio/video decoding device based on a dual optical fiber, and specifically includes:
the high-speed interface sending processing module is controlled to respectively send the first audio and video coding data and the second audio and video coding data to a corresponding first coding end optical module and a corresponding second coding end optical module, so that the first coding end optical module and the second coding end optical module send the first audio and video coding data and the second audio and video coding data to a first decoding end optical module and a second decoding end optical module in audio and video decoding equipment based on double optical fibers, and a high-speed interface receiving processing module in the audio and video decoding equipment receives the first audio and video coding data and the second audio and video coding data in the first decoding end optical module and the second decoding end optical module.
In a possible implementation manner, the audio/video decoding device is configured to determine whether the main link state and the standby link state are abnormal in real time, and specifically includes:
acquiring a first decoding state indicating signal corresponding to the primary audio and video coded data, and comparing the first decoding state indicating signal with a preset decoding abnormal state indicating signal;
if the first decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, the link state corresponding to the primary audio and video coded data is considered to be abnormal, otherwise, the link corresponding to the primary audio and video coded data is considered to be normal;
acquiring a second decoding state indicating signal corresponding to the standby audio and video coded data, and comparing the second decoding state indicating signal with a preset decoding abnormal state indicating signal;
and if the second decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, considering that the link state corresponding to the standby audio and video coded data is abnormal, otherwise, considering that the link corresponding to the standby audio and video coded data is normal.
In a possible implementation manner, the audio/video encoding device is configured to encode the acquired audio/video data to obtain audio/video encoded data, and specifically includes:
acquiring sound source data in audio source equipment, and setting a sound source indication label for the sound source data to obtain audio coded data;
acquiring video data in video source equipment, and setting a video indication label for the video data; video coding data is obtained.
In a possible implementation manner, the audio/video encoding device is configured to copy the audio/video encoding data to obtain first audio/video encoding data and second audio/video encoding data, and specifically includes:
monitoring the video buffer amount in a video buffer queue and the audio buffer amount in an audio buffer queue in real time, and comparing the video buffer amount with the audio buffer amount;
when the video buffer amount is larger than or equal to the audio buffer amount, preferably reading the video coding data in the video buffer queue, and copying the video coding data into the same first video coding data and second video coding data;
when the video buffer amount is smaller than the audio buffer amount, preferably, the audio coded data in the audio buffer queue is read, and the audio coded data is copied into the same first audio coded data and second audio coded data.
The invention provides an audio and video transmission system based on double optical fibers, which further comprises: the audio source device, the video source device, the audio output device and the display device;
the audio and video coding device is connected with the audio source device through a 3.5mm audio input line, the audio and video coding device is connected with the video source device through an HDMI video input line, the audio and video coding device is connected with the audio and video decoding device through a main optical fiber and a standby optical fiber, the audio and video decoding device is connected with the display device through an HDMI video output line, and the audio and video decoding device is connected with the audio output device through a 3.5mm audio output line.
In a possible implementation manner, the audio and video encoding device includes a first FPGA chip, a first encoding end optical module, a second encoding end optical module, a first power module, and a first switch button, where the first FPGA chip includes an audio lossless encoding processing module, a video lossless encoding processing module, and a high-speed interface sending processing module.
In a possible implementation manner, the audio/video decoding device includes a second FPGA chip, a first decoding end optical module, a second encoding end optical module, a second power module, and a second switch button, where the second FPGA chip includes an audio decoding processing module, a video decoding processing module, a main/standby link switching processing module, and a high-speed interface receiving processing module.
The invention provides an audio and video transmission system based on double optical fibers, which further comprises: the device comprises a first 3.5mm audio interface, a first HDMI interface, a first power supply interface, a second 3.5mm audio interface, a second HDMI interface and a second power supply interface;
the first 3.5mm audio interface is connected with the audio lossless coding processing module, the first HDMI interface is connected with the video lossless coding processing module, and the first power supply interface is connected with the first power supply module;
the second 3.5mm audio interface is connected with the audio decoding processing module, the second HDMI interface is connected with the video decoding processing module, and the second power supply interface is connected with the second power supply module.
Compared with the prior art, the audio and video transmission method and system based on the double optical fibers have the following beneficial effects:
the quality of images and audio is ensured by carrying out lossless and non-compression coding on input audio and video data, the obtained audio and video coding data are copied into two paths of video coding data which are the same, and the two paths of video coding data are sent to audio and video decoding equipment based on double optical fibers; and after the audio and video decoding equipment receives the two paths of audio and video coding data, detecting the link states of the main link and the standby link in real time, and selecting the main audio and video coding data corresponding to the main link to perform decoding processing when the main link is recovered to be normal: when the main link is abnormal, the automatic switching is carried out to the standby link, the automatic detection of the abnormality is realized, the automatic switching is carried out to the standby link, the seamless switching in the switching process is realized, the condition of audio and video interruption is avoided, and the transmission reliability is ensured.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a dual-fiber-based audio/video transmission method provided by the present invention;
fig. 2 is a schematic diagram of a hardware device connection of an embodiment of a dual optical fiber-based audio/video transmission system provided in the present invention;
fig. 3 is a schematic structural diagram of a device interface functional module of an audio and video encoding device according to a fourth embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device interface function module of an audio/video decoding device according to a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Example 1
Referring to fig. 1, fig. 1 is a schematic flowchart of an embodiment of a dual-fiber-based audio/video transmission method provided in the present invention, and as shown in fig. 1, the method includes steps 101 to 104, which are specifically as follows:
step 101: the method comprises the steps of controlling audio and video coding equipment to carry out coding processing on acquired audio and video data to obtain audio and video coding data, copying the audio and video coding data to obtain first audio and video coding data and second audio and video coding data, and sending the first audio and video coding data and the second audio and video coding data to audio and video decoding equipment based on double optical fibers.
In one embodiment, the audio and video coding device is connected with an audio source device through a 3.55mm audio input line, so that the audio and video coding device acquires audio source data in the audio source device; meanwhile, the audio and video coding equipment is connected with the video source equipment through the HDMI video input line, so that the audio and video coding equipment acquires video data in the video source equipment.
In an embodiment, after the audio and video coding device acquires the sound source data and the video data, the audio and video coding device sets a sound source indication tag for the sound source data to obtain audio coded data, sets a video indication tag for the video data to obtain video coded data, and performs non-compression lossless coding processing on the sound source data and the video data.
Specifically, for video data, the audio/video coding device adds a bit 0 to the video data input by the HDMI video input line as a video indication tag, where the tag is used to distinguish whether the data is video data or audio data, and stores the video coded data to which the video indication tag bit 0 is added into a video buffer queue, and waits for being read and transmitted.
For audio data, the audio and video coding device adds a bit 1 to the audio data input by the 3.5mm sound source input line as an audio indication tag, the tag is used for distinguishing whether the data is audio data or video data, and stores the audio data added with the audio indication tag bit 1 into an audio buffer queue to wait for being read and sent.
When the audio and video data are coded, only one bit of data is added to the audio and video data, and source data are not damaged or modified, so that the audio and video coding process is compression-free lossless coding, and the quality of video images and audio can be ensured.
In an embodiment, after the audio and video data is encoded, the audio and video encoding device further needs to extract and copy the audio and video encoding data from the audio and video buffer queue to obtain first audio and video encoding data and second audio and video encoding data.
Specifically, the audio and video coding device monitors the video buffer amount in the video buffer queue and the audio buffer amount in the audio buffer queue in real time, and compares the video buffer amount with the audio buffer amount.
When the video buffer amount is larger than or equal to the audio buffer amount, preferentially reading the video coding data in the video buffer queue, and copying the video coding data into two paths of data streams which are identical in a same mode to obtain first video coding data and second video coding data; and reading the audio coding data in the audio buffer queue, and copying the audio coding data into two paths of data streams with the same mode to obtain first audio coding data and second audio coding data.
When the video buffer amount is smaller than the audio buffer amount, preferentially reading the audio coded data in the audio buffer queue, and copying the audio coded data into two paths of data streams with the same mode to obtain first audio coded data and second audio coded data; and reading the video coding data in the video buffer queue, and copying the video coding data into two paths of data streams with the same mode to obtain first video coding data and second video coding data.
In one embodiment, the first audio and video encoding data and the second audio and video encoding data are further sent to audio and video decoding equipment based on double optical fibers.
And controlling a high-speed interface sending processing module in the audio and video coding equipment to respectively send the first audio and video coding data and the second audio and video coding data to a corresponding first coding end optical module and a corresponding second coding end optical module so that the first coding end optical module and the second coding end optical module respectively send the first audio and video coding data and the second audio and video coding data to a first decoding end optical module and a second decoding end optical module in the audio and video decoding equipment on the basis of double optical fibers.
Specifically, the audio and video coding device comprises an FPGA chip, and two paths of 12.5 Gb-rate high-speed interface sending processing modules provided in the FPGA chip respectively send the first audio and video coded data and the second audio and video coded data to two paths of 12.5 Gb-rate high-speed interface sending processing modules provided in the FPGA chip, each path of high-speed interface sending processing module provided in the FPGA chip can send the parallel first audio and video coded data and the parallel second audio and video coded data to the two hardware first coding end optical modules and the second coding end optical modules through 8B10B coding, and finally send the serial first audio and video coded data and the serial second audio and video coded data at 12.5Gb rates to the two hardware first coding end optical modules and the second coding end optical modules, and 8B10B coding is lossless reversible coding, so the whole coding process is lossless. The first coding end optical module and the second coding end optical module are connected with the first decoding end optical module and the second decoding end optical module of the audio and video decoding device through the first optical fiber wire and the second optical fiber wire, so that the first audio and video coding data and the second audio and video coding data are sent to the first decoding end optical module and the second decoding end optical module in the audio and video decoding device.
Step 102: and the control audio and video decoding equipment receives the first audio and video coding data and the second audio and video coding data, sets the first audio and video coding data as main audio and video coding data, and sets the second audio and video coding data as standby audio and video coding data.
In one embodiment, after the audio and video decoding device receives the first audio and video encoding data and the second audio and video encoding data, because the first audio and video encoding data and the second audio and video encoding data are the same data stream, in this embodiment, any one of the first audio and video encoding data and the second audio and video encoding data is set as the main audio and video encoding data or the auxiliary audio and video encoding data.
Specifically, the first audio/video coding data is set as main audio/video coding data, and the second audio/video coding data is set as standby audio/video coding data.
Preferably, the second audio/video coded data may also be set as primary audio/video coded data, and the first audio/video coded data may also be set as backup audio/video coded data.
Step 103: and acquiring a main link state corresponding to the main audio and video coded data and a standby link state corresponding to the standby audio and video coded data, and judging whether the main link state and the standby link state are abnormal in real time.
Step 104: when the state of the main link is normal, decoding the main audio and video coded data; and when the main link state is abnormal and the standby link state is normal, switching the main audio and video coding data into the standby audio and video coding data, decoding the standby audio and video coding data until audio and video decoding data are generated, and outputting the audio and video data.
In an embodiment, the audio and video decoding device further includes a second FPGA chip, and the second FPGA chip receives and processes two 12.5Gb high-speed interfaces provided therein. When the audio and video coding device sends the first audio and video coding data and the second audio and video coding data to a first decoding end optical module and a second decoding end optical module of the audio and video decoding device, based on the connection relationship between the first decoding end optical module and the second decoding end optical module and two 12.5Gb high-speed interface receiving and processing modules, the two 12.5Gb high-speed interface receiving and processing modules can simultaneously carry out serial conversion and parallel processing on two 12.5 Gb-rate serial first audio and video coding data and two 12.5 Gb-rate serial second audio and video coding data so as to convert the serial first audio and video coding data and the serial second audio and video coding data into parallel first audio and video coding data and parallel second audio and video coding data, and the converted parallel first audio and video coding data and the converted second audio and video coding data are subjected to inverse decoding processing of 10B 8B.
In an embodiment, when the audio and video decoding device decodes the first audio and video encoding data and the second audio and video encoding data, because the first audio and video encoding data is set as the main audio and video encoding data and the second audio and video encoding data is set as the standby audio and video encoding data, the decoding end optical module that receives the main audio and video encoding data is also set as the main optical module, and the decoding end optical module that receives the standby audio and video encoding data is set as the standby optical module.
In an embodiment, the second FPGA chip in the audio/video decoding device monitors the states of the links corresponding to the main optical module and the standby optical module in real time, that is, monitors the state of the main link corresponding to the main audio/video encoded data and the state of the standby link corresponding to the standby audio/video encoded data in real time.
In one embodiment, whether the link state corresponding to the primary audio and video coded data is abnormal is judged; comparing a first decoding state indicating signal corresponding to the primary audio and video coded data with a preset decoding abnormal state indicating signal by acquiring the first decoding state indicating signal; and if the first decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, considering that the link state corresponding to the primary audio and video coded data is abnormal, otherwise, considering that the link corresponding to the primary audio and video coded data is normal.
In one embodiment, whether the link state corresponding to the standby audio and video coding data is abnormal is judged; comparing a second decoding state indicating signal corresponding to the standby audio and video coded data with a preset decoding abnormal state indicating signal by acquiring the second decoding state indicating signal; and if the second decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, considering that the link state corresponding to the standby audio and video coded data is abnormal, otherwise, considering that the link corresponding to the standby audio and video coded data is normal.
Specifically, the preset decoding abnormal state indication signal is an 8B10B decoding state indication signal RXSTATUS [2:0] in a 12.5G high-speed interface receiving processing module of the second FPGA chip, where the states of the 8B10B decoding state indication signal include 5 types:
1）、000b: Received data OK；
2）、001b: 1 SKP added；
3）、010b: 1 SKP removed；
4）、011b: Receiver detected；
5）、100b: 8B/10B decode error。
the first 4 are communication decoding normality, when the state is 100B, the decoding is abnormal by 8B10, and the FPGA program judges that the link is abnormal in communication or has error codes.
According to the status indication signals, the second FPGA chip monitors both the two types of status indication signals of the main link and the standby link in real time, and when the 12.5G high-speed interface receiving processing module RXSTATUS [2:0] =100b, the current link is abnormal in communication, otherwise, the communication is normal. Two registers are used in a second FPGA chip to register the detected states of the main link and the standby link for representing the detected states of the main link and the standby link; wherein, link _ m =1 represents that the main link is normal, and link _ m =0 represents that the main link is abnormal; link _ s =1 represents that the backup link is normal, and link _ s =0 represents that the backup link is abnormal.
In an embodiment, after the status indication signal is monitored in real time, when the status of the main link is abnormal (link _ m =0) and the backup link is normal (link _ s =1), the second FPGA chip switches and selects the backup audio and video coded data of the backup link to perform audio and video data decoding processing, and switches and selects the main audio and video coded data of the main link again to perform audio and video data decoding processing after detecting that the main link is recovered to be normal (link _ m =1), and seamless switching to the backup link is realized by a method of detecting the real-time abnormality and switching data streams when the main link is abnormal, so that two lossless audio and video data streams with tag bits are finally recovered, wherein the two lossless audio and video data streams with tag bits are lossless audio data and lossless video data.
In one embodiment, the tag bit is obtained for two decoded paths of lossless audio and video data with tag bits, if the tag bit is 0, the lossless audio and video data is represented as lossless video data, the lossless video data is sent to a video cache queue after the tag bit is removed, and when a video display time sequence arrives, the lossless video data in the video cache queue is sequentially read out and output to an HDMI video output interface and display equipment; if the label bit is 1, the lossless audio and video data is represented as lossless audio data, the lossless audio and video data is sent to an audio buffer queue after the label bit is removed, and when the audio output time sequence comes, the lossless audio data in the audio buffer queue is read out in sequence and output to a 3.5mm audio output interface.
In an embodiment, when the state of the main link is detected to be abnormal or recovered to be normal in real time, and the audio/video coded data needs to be switched from the main link to the standby link or switched back from the standby link to the main link again, the video coded data in the audio/video coded data may be incomplete, so that to implement seamless switching of video images, the video coded data in the audio/video coded data also needs to be acquired, and the video coded data is processed.
In an embodiment, for an audio and video encoding device, when the audio and video encoding device sends the video encoding data to the audio and video decoding device, cyclic redundancy check is further performed on each frame of image encoding data in the video encoding data to obtain first cyclic redundancy check data, and the first cyclic redundancy check data is added to the corresponding frame of image encoding data, so that the first cyclic redundancy check data is sent to the audio and video decoding device.
For the audio and video decoding equipment, after video coded data sent by audio and video decoding data are received, cyclic redundancy check is carried out on each frame of image coded data in the video coded data to obtain second cyclic redundancy check data, the second cyclic redundancy check data is compared with the first cyclic redundancy check data, and if the second cyclic redundancy check data is equal to the first cyclic redundancy check data, the frame image coded data in the received video coded data are considered to be complete and correct; and if the second cyclic redundancy check data is not equal to the first cyclic redundancy check data, the frame image coded data in the received video coded data is considered to be incomplete.
Specifically, when the audio and video coding device sends video data, the calculated first cyclic redundancy check data is placed at the frame end of the corresponding frame image data; the audio and video decoding equipment writes each frame of received image data into a DDR after receiving the video coding data, wherein the DDR has two sections of independent spaces for caching 2 frames of image data, cyclic redundancy check calculation is carried out on each frame of image data, after second cyclic redundancy check data of one frame of image are calculated, the second cyclic redundancy check data are compared with first cyclic redundancy check data at the tail of the frame, and if the comparison between the two is equal, the video coding data are read from the DDR for display; when the main link and the standby link are switched, image incompleteness is caused at the moment of switching, so that the comparison between the main link and the standby link is unequal, when the comparison between the main link and the standby link is unequal, the image data of the frame cannot be read from the DDR to be displayed, the image data of the previous frame is read, image freezing of the frame is realized, the integrity of image display is ensured, the data received by the next frame covers the buffer space of the incomplete frame image in the DDR, and the FPGA can read and display the complete frame after the next complete frame covers the incomplete frame image.
In summary, the audio/video transmission method based on dual optical fibers provided by the present invention performs lossless non-compression coding on the input audio/video data through an FPGA (field programmable gate array) chip in the audio/video coding device, so as to ensure the image and audio quality, the coded audio/video coding data is copied into two identical data streams, the two identical data streams are respectively sent to two encoding end optical modules in the audio/video coding device through a 12.5Gb high-speed interface sending and processing module provided in the FPGA chip, the two encoding end optical modules in the audio/video coding device are connected to two decoding end optical modules at a decoding end through two optical fiber lines, so that the FPGA chip in the audio/video decoding device receives the audio/video coding data through the internal 12.5Gb high-speed interface receiving and processing module provided in the audio/video coding device, and simultaneously detects the link states of the main and standby links in real time, and selecting one path as data decoding: when the main link is abnormal, the standby link is automatically switched, and when the main link is recovered to be normal, the main link is automatically switched back to the main link, so that the automatic detection of the abnormality is realized, the standby link is automatically switched, and the seamless switching in the switching process is realized. The decoded audio and video data are respectively sent out through a 3.5mm interface and an HDMI interface, so that the condition of audio and video interruption is avoided, and the transmission reliability is ensured.
Example 2
Referring to fig. 2, fig. 2 is a schematic diagram of a hardware device connection of an embodiment of a dual-fiber-based audio/video transmission system provided in the present invention, as shown in fig. 2, the system includes an audio/video encoding device 201 and an audio/video decoding device 202, and further includes: an audio source device 203, a video source device 204, an audio output device 205, and a display device 206;
wherein, audio and video coding equipment 201 through 3.5mm audio input line with audio source equipment 203 is connected, audio and video coding equipment 201 through HDMI video input line with video source equipment 204 is connected, audio and video coding equipment 201 through main fiber with be equipped with the optic fibre with audio and video decoding equipment 202 is connected, audio and video decoding equipment 202 through HDMI video output line with display device 206 is connected, audio and video decoding equipment 202 through 3.5mm audio output line with audio output equipment 205 is connected.
In an embodiment, as shown in fig. 3, fig. 3 is a schematic structural diagram of a device interface functional module of an audio and video encoding device. The audio and video coding device 201 comprises a first FPGA chip, a first coding end optical module, a second coding end optical module, a first power module and a first switch button, wherein the first FPGA chip comprises an audio lossless coding processing module, a video lossless coding processing module and a high-speed interface sending processing module.
In an embodiment, the audio/video encoding device 201 further includes: the device comprises a first 3.5mm audio interface, a first HDMI interface and a first power supply interface; the first 3.5mm audio interface is connected with the audio lossless coding processing module, the first HDMI interface is connected with the video lossless coding processing module, and the first power supply interface is connected with the first power supply module.
In an embodiment, as shown in fig. 4, fig. 4 is a schematic structural diagram of a device interface functional module of an audio/video decoding device. The audio and video decoding device 202 includes a second FPGA chip, a first decoding end optical module, a second encoding end optical module, a second power module, and a second switch button, where the second FPGA chip includes an audio decoding processing module, a video decoding processing module, a main/standby link switching processing module, and a high-speed interface receiving processing module.
In an embodiment, the audio/video decoding device 202 further includes: the second 3.5mm audio interface, the second HDMI interface and the second power source interface, wherein the second 3.5mm audio interface is connected with the audio decoding processing module, the second HDMI interface is connected with the video decoding processing module, and the second power source interface is connected with the second power source module.
In one embodiment, the first decoding-end optical module is connected to the first decoding-end optical module through a first optical fiber line, and the second decoding-end optical module is connected to the second decoding-end optical module through a second optical fiber; the first optical fiber line can be set as a main optical fiber line, and when the first optical fiber line is set as the main optical fiber line, the second optical fiber line is set as a spare optical fiber line; the first optical fiber line can also be set as a spare optical fiber line, and when the first optical fiber line is set as the spare optical fiber line, the second optical fiber line is set as a main optical fiber line.
In one embodiment, the first FPGA chip further includes a first FLASH memory, and the second FPGA chip further includes a second FLASH memory and a DDR frame buffer; the first FLASH FLASH memory and the second FLASH FLASH memory are respectively used for storing corresponding FPGA programs, and the DDR frame cache is used for storing frame image data.
In one embodiment, the audio and video decoding device and the audio and video encoding device are provided with a power supply module and a switch button, each switch button controls whether a power supply input is conducted with the power supply module, when the switch button is pressed, the power supply input is conducted with the power supply module and starts to supply power to corresponding devices, after the devices supply power, the FPGA chip loads a cured FPGA program from a FLASH FLASH memory, and after the FPGA program is loaded, the functions of the devices run.
In one embodiment, the audio/video coding device is configured to perform coding processing on the acquired audio/video data to obtain audio/video coded data, copy the audio/video coded data to obtain first audio/video coded data and second audio/video coded data, and send the first audio/video coded data and the second audio/video coded data to an audio/video decoding device based on dual optical fibers;
in an embodiment, the audio/video decoding device is configured to receive the first audio/video encoding data and the second audio/video encoding data, set the first audio/video encoding data as primary audio/video encoding data, and set the second audio/video encoding data as secondary audio/video encoding data.
In an embodiment, the audio/video decoding device is further configured to obtain a main link state corresponding to the main audio/video encoded data and a standby link state corresponding to the standby audio/video encoded data, and determine whether the main link state and the standby link state are abnormal in real time.
In one embodiment, the audio/video decoding device is further configured to decode the primary audio/video encoded data when the primary link state is normal; when the main link state is abnormal and the standby link state is normal, the main audio and video coding data are switched into the standby audio and video coding data, the standby audio and video coding data are decoded until audio and video decoding data are generated, and the audio and video data are output.
In one embodiment, the audio/video encoding device is configured to send the first audio/video encoding data and the second audio/video encoding data to an audio/video decoding device based on dual optical fibers, and specifically, the high-speed interface sending processing module is controlled to send the first audio/video encoding data and the second audio/video encoding data to the corresponding first encoding end optical module and second encoding end optical module respectively, so that the first encoding end optical module and the second encoding end optical module transmit the first audio and video encoding data and the second audio and video encoding data to a first decoding end optical module and a second decoding end optical module in audio and video decoding equipment based on double optical fibers, and a high-speed interface receiving processing module in the audio and video decoding equipment is used for receiving the first audio and video coding data and the second audio and video coding data in the first decoding end optical module and the second decoding end optical module.
In one embodiment, the audio/video decoding device is configured to determine whether the main link state and the standby link state are abnormal in real time; specifically, a first decoding state indication signal corresponding to the primary audio and video coded data is obtained, and the first decoding state indication signal is compared with a preset decoding abnormal state indication signal; if the first decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, the link state corresponding to the primary audio and video coded data is considered to be abnormal, otherwise, the link corresponding to the primary audio and video coded data is considered to be normal; acquiring a second decoding state indicating signal corresponding to the standby audio and video coded data, and comparing the second decoding state indicating signal with a preset decoding abnormal state indicating signal; and if the second decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, considering that the link state corresponding to the standby audio and video coded data is abnormal, otherwise, considering that the link corresponding to the standby audio and video coded data is normal.
In one embodiment, the audio and video coding device is configured to perform coding processing on the acquired audio and video data to obtain audio and video coded data; specifically, sound source data in audio source equipment is obtained, and a sound source indication label is set for the sound source data to obtain audio coded data; acquiring video data in video source equipment, and setting a video indication label for the video data; video coding data is obtained.
In one embodiment, the audio and video coding device is configured to copy the audio and video coding data to obtain first audio and video coding data and second audio and video coding data; specifically, monitoring a video buffer amount in a video buffer queue and an audio buffer amount in an audio buffer queue, and comparing the video buffer amount with the audio buffer amount; when the video buffer amount is larger than or equal to the audio buffer amount, preferably reading the video coding data in the video buffer queue, and copying the video coding data into the same first video coding data and second video coding data; when the video buffer amount is smaller than the audio buffer amount, preferably, the audio coded data in the audio buffer queue is read, and the audio coded data is copied into the same first audio coded data and second audio coded data.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing method embodiment, and details are not described herein.
In summary, the invention provides a method and a system for audio and video transmission based on dual optical fibers, the method ensures the quality of images and audio by carrying out lossless and compression-free encoding on input audio and video data, copies two paths of identical video encoding data on the obtained audio and video encoding data, and sends the two paths of video encoding data to audio and video decoding equipment based on dual optical fibers; and after the audio and video decoding equipment receives the two paths of audio and video coding data, detecting the link states of the main link and the standby link in real time, and selecting the main audio and video coding data corresponding to the main link to perform decoding processing when the main link is recovered to be normal: when the main link is abnormal, the automatic switching is carried out to the standby link, the automatic detection of the abnormality is realized, the automatic switching is carried out to the standby link, the seamless switching in the switching process is realized, the condition of audio and video interruption is avoided, and the transmission reliability is ensured.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A dual-optical-fiber-based audio and video transmission method is characterized by comprising the following steps:
controlling audio and video coding equipment to code the acquired audio and video data to obtain audio and video coding data, copying the audio and video coding data to obtain first audio and video coding data and second audio and video coding data, and sending the first audio and video coding data and the second audio and video coding data to audio and video decoding equipment based on double optical fibers;
controlling audio and video decoding equipment to receive the first audio and video coding data and the second audio and video coding data, setting the first audio and video coding data as main audio and video coding data, and setting the second audio and video coding data as standby audio and video coding data;
acquiring a main link state corresponding to the main audio and video coded data and a standby link state corresponding to the standby audio and video coded data, and judging whether the main link state and the standby link state are abnormal in real time;
when the state of the main link is normal, decoding the main audio and video coded data; and when the main link state is abnormal and the standby link state is normal, switching the main audio and video coding data into the standby audio and video coding data, decoding the standby audio and video coding data until audio and video decoding data are generated, and outputting the audio and video data.
2. A dual-fiber-based audio-video transmission method according to claim 1, wherein the transmitting the first audio-video encoded data and the second audio-video encoded data to an audio-video decoding device based on dual fibers specifically includes:
controlling a high-speed interface sending processing module in audio and video coding equipment to respectively send the first audio and video coding data and the second audio and video coding data to a corresponding first coding end optical module and a corresponding second coding end optical module so that the first coding end optical module and the second coding end optical module respectively send the first audio and video coding data and the second audio and video coding data to a first decoding end optical module and a second decoding end optical module in audio and video decoding equipment on the basis of double optical fibers;
and a high-speed interface receiving processing module in the audio and video decoding equipment is controlled to receive the first audio and video coding data and the second audio and video coding data in the first decoding end optical module and the second decoding end optical module.
3. A dual-fiber-based audio/video transmission method according to claim 1, wherein the real-time determination of whether the main link state and the standby link state are abnormal specifically includes:
acquiring a first decoding state indicating signal corresponding to the primary audio and video coded data, and comparing the first decoding state indicating signal with a preset decoding abnormal state indicating signal;
if the first decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, the link state corresponding to the primary audio and video coded data is considered to be abnormal, otherwise, the link corresponding to the primary audio and video coded data is considered to be normal;
acquiring a second decoding state indicating signal corresponding to the standby audio and video coded data, and comparing the second decoding state indicating signal with a preset decoding abnormal state indicating signal;
and if the second decoding state indicating signal is the same as the preset decoding abnormal state indicating signal, considering that the link state corresponding to the standby audio and video coded data is abnormal, otherwise, considering that the link corresponding to the standby audio and video coded data is normal.
4. A dual-fiber-based audio/video transmission method according to claim 1, wherein the controlling of the audio/video encoding device performs encoding processing on the acquired audio/video data to obtain audio/video encoded data specifically comprises:
acquiring sound source data in audio source equipment, and setting a sound source indication label for the sound source data to obtain audio coded data;
acquiring video data in video source equipment, and setting a video indication label for the video data; video coding data is obtained.
5. A dual-fiber-based audio-video transmission method according to claim 4, wherein the audio-video coded data is copied to obtain first audio-video coded data and second audio-video coded data, and specifically includes:
monitoring the video buffer amount in a video buffer queue and the audio buffer amount in an audio buffer queue in real time, and comparing the video buffer amount with the audio buffer amount;
when the video buffer amount is larger than or equal to the audio buffer amount, firstly reading the video coding data in the video buffer queue, and copying the video coding data into the same first video coding data and second video coding data;
when the video buffer amount is smaller than the audio buffer amount, the audio coding data in the audio buffer queue are read first, and the audio coding data are copied into the same first audio coding data and second audio coding data.
6. A dual fiber based audio/video transmission system comprising: audio and video coding equipment and audio and video decoding equipment;
the audio and video coding device is used for coding the acquired audio and video data to obtain audio and video coding data, copying the audio and video coding data to obtain first audio and video coding data and second audio and video coding data, and sending the first audio and video coding data and the second audio and video coding data to the audio and video decoding device based on double optical fibers;
the audio and video decoding device is used for receiving the first audio and video coding data and the second audio and video coding data, setting the first audio and video coding data as main audio and video coding data, and setting the second audio and video coding data as standby audio and video coding data;
the audio and video decoding device is further configured to acquire a main link state corresponding to the main audio and video coded data and a standby link state corresponding to the standby audio and video coded data, and determine whether the main link state and the standby link state are abnormal in real time;
the audio and video decoding equipment is also used for decoding the main audio and video coded data when the main link state is normal; and when the main link state is abnormal and the standby link state is normal, switching the main audio and video coding data into the standby audio and video coding data, decoding the standby audio and video coding data until audio and video decoding data are generated, and outputting the audio and video data.
7. A dual fiber based audio/video transmission system according to claim 6 further comprising: the audio source device, the video source device, the audio output device and the display device;
the audio and video coding device is connected with the audio source device through a 3.5mm audio input line, the audio and video coding device is connected with the video source device through an HDMI video input line, the audio and video coding device is connected with the audio and video decoding device through a main optical fiber and a standby optical fiber, the audio and video decoding device is connected with the display device through an HDMI video output line, and the audio and video decoding device is connected with the audio output device through a 3.5mm audio output line.
8. The dual-fiber-based audio and video transmission system according to claim 6, wherein the audio and video coding device comprises a first FPGA chip, a first coding end optical module, a second coding end optical module, a first power module and a first switch button, wherein the first FPGA chip comprises an audio lossless coding processing module, a video lossless coding processing module and a high-speed interface transmission processing module.
9. The dual-fiber-based audio/video transmission system according to claim 8, wherein the audio/video decoding device comprises a second FPGA chip, a first decoding-end optical module, a second encoding-end optical module, a second power module, and a second switch button, wherein the second FPGA chip comprises an audio decoding processing module, a video decoding processing module, a main/standby link switching processing module, and a high-speed interface receiving processing module.
10. A dual fiber based audio-visual transmission system according to claim 9 further comprising: the device comprises a first 3.5mm audio interface, a first HDMI interface, a first power supply interface, a second 3.5mm audio interface, a second HDMI interface and a second power supply interface;
the first 3.5mm audio interface is connected with the audio lossless coding processing module, the first HDMI interface is connected with the video lossless coding processing module, and the first power supply interface is connected with the first power supply module;
the second 3.5mm audio interface is connected with the audio decoding processing module, the second HDMI interface is connected with the video decoding processing module, and the second power supply interface is connected with the second power supply module.
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