CN111479096A - Optical fiber signal encoder and method thereof - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
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Abstract
The invention provides an optical fiber signal encoder, which comprises: the device comprises an optical fiber signal input module, an SDI signal receiving module, an HDMI signal transmitting module, an SDI signal driving module, an HDMI signal receiving module, a coding main processor module and a switch module. According to the optical fiber signal encoder provided by the invention, data is transmitted through optical fiber signals, so that the problem of video ultra-long distance transmission is solved. The optical fiber signal is converted into an HDMI signal to be sent, so that the high-efficiency compression of the video signal is completed; meanwhile, the received HDMI signal is converted into a BT1120 video signal, and then the BT1120 video signal is converted into an RTSP network stream based on UDP through secondary coding for network distribution, so that the problems of real-time playing, transmission bandwidth, storage, high-definition display and the like of the video are solved.
Description
Technical Field
The invention relates to the technical field of multimedia, in particular to an optical fiber signal encoder and a method thereof.
Background
The traditional media information publishing and playing mode mainly comprises video direct transmission, such as VGA (video graphics array) signals, HDMI (high-definition multimedia interface) signals and SDI (Serial digital interface) signals, which are directly transmitted to a media playing terminal for playing and displaying, and a network-based multimedia information publishing system, which comprises a media server, a network, a display player, information publishing software and the like, wherein the information of the server is transmitted to the player through a network (a wide area network/a local area network/a private network/a wireless network), and then the player combines information of audio and video, pictures, characters and the like and transmits the information to display equipment such as a liquid crystal display and the like to accept the audio and video input to form the playing of audio and video files, so that a set of audio.
The media publishing system based on video direct transmission of VGA signals, HDMI signals, SDI signals and the like has a relatively outstanding defect in the aspect of transmission distance, and in addition, because media files are too large, a mode of downloading first and then playing can only be adopted sometimes, so that the mode is not only time-wasting but also lack of real-time performance. At present, three major difficulties of transmission bandwidth, storage and high definition display mainly exist in a multimedia information publishing system based on a network, and the hardware condition of the network system is urgently needed to be improved, such as upgrading the network bandwidth and solving the defects of network delay jitter and packet loss and the like. The prior art mainly has a series of defects in the aspects of transmission distance, image definition, video fluency, network playing real-time performance and the like and needs to be improved.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an optical fiber signal encoder and a method thereof.
The invention provides an optical fiber signal encoder, which comprises: the device comprises an optical fiber signal input module, an SDI signal receiving module, an HDMI signal transmitting module, an SDI signal driving module, an HDMI signal receiving module, an encoding main processor module and a switch module;
the optical fiber signal input module is connected with the SDI signal receiving module and used for converting an optical fiber signal into a differential signal and inputting the differential signal to the SDI signal receiving module;
the SDI signal receiving module is also connected with the HDMI signal transmitting module and used for converting the differential signal into YUV format video data and IIS format audio data and outputting the YUV format video data and the IIS format audio data to the HDMI signal transmitting module;
the HDMI signal transmitting module is used for converting the YUV format video data and the IIS format audio data into HDMI signals;
the SDI signal driving module is connected with the SDI signal receiving module and used for receiving the differential signal sent by the SDI signal receiving module and converting the differential signal into an SDI signal for loop output;
the HDMI signal receiving module is connected with the HDMI signal sending module and is used for converting the HDMI signals into video signals in a BT1120 format;
the encoding main processor module is respectively connected with the SDI signal receiving module, the HDMI signal receiving module and the switch module; and the coding main processor module is used for receiving the IIS format audio data provided by the SDI signal receiving module and the BT1120 format video signal provided by the HDMI signal receiving module, coding and converting the audio data into an RTSP network stream based on UDP, and then transmitting the RTSP network stream to each terminal device through the switch module.
Preferably, the encoding main processor module converts the IIS format audio data and the BT1120 format video signal into a UDP-based RTSP network stream through h.265 encoding.
Preferably, the device further comprises an MCU main control module, wherein the MCU main control module is respectively connected with the SDI signal receiving module, the HDMI signal transmitting module and the HDMI signal receiving module and is used for configuring the register.
Preferably, the device further comprises a memory module, wherein the memory module is connected with the HDMI signal receiving module and is used for storing the configuration information related to video conversion required by the HDMI signal receiving module.
Preferably, the system further comprises a delay shutdown circuit module, the delay shutdown circuit module is connected with the coding main processor module, and the coding main processor module performs delay shutdown through the delay shutdown circuit module.
Preferably, the system further comprises a hard disk storage module which is connected with the coding main processor module.
Preferably, the switch module is connected to each terminal device through the BYPASS circuit module.
Preferably, the power supply module is further included, and the DCDC or L DO power management chip is adopted.
An optical fiber signal coding method comprises the steps of firstly converting an optical fiber signal into an HDMI signal through first coding and decoding, then converting the HDMI signal into a BT1120 video signal, and then converting the BT1120 video signal into an RTSP network stream based on UDP through second coding for network distribution.
Preferably, the first encoding and decoding method includes: the optical fiber signal is converted into a differential signal, the differential signal is converted into a YUV video signal and an IIS audio signal, and the YUV video signal and the IIS audio signal are converted into HDMI signals.
According to the optical fiber signal encoder provided by the invention, data is transmitted through optical fiber signals, so that the problem of video ultra-long distance transmission is solved. The optical fiber signal is converted into an HDMI signal to be sent, so that the high-efficiency compression of the video signal is completed; meanwhile, the received HDMI signal is converted into a BT1120 video signal, and then the BT1120 video signal is converted into an RTSP network stream based on UDP through secondary coding for network distribution, so that the problems of real-time playing, transmission bandwidth, storage, high-definition display and the like of the video are solved.
The optical fiber signal encoder provided by the invention adopts optical fiber signal input, a video conversion technology, a video compression technology, a network streaming media technology and the like, can effectively solve the problems of transmission distance, transmission bandwidth, storage, high-definition display, real-time display and the like, and realizes the optimization of media information release.
The optical fiber signal encoder and the method thereof realize the super-long-distance high-definition media information release and realize the effective transmission and multi-stage multi-mode distribution of full high-definition multimedia signals.
Drawings
Fig. 1 is a block diagram of an overall architecture of an optical fiber signal encoder according to the present invention;
FIG. 2 is a block diagram of another optical fiber signal encoder architecture according to the present invention;
fig. 3 is a flowchart of a method for encoding an optical fiber signal according to the present invention.
Detailed Description
Referring to fig. 1, the present invention provides an optical fiber signal encoder, including: the device comprises an optical fiber signal input module 1, an SDI signal receiving module 2, an HDMI signal transmitting module 3, an SDI signal driving module 4, an HDMI signal receiving module 6, an encoding main processor module 9 and a switch module 11.
The optical fiber signal input module 1 is connected to the SDI signal receiving module 2, and is configured to convert an optical fiber signal into a differential signal and input the differential signal to the SDI signal receiving module 2. In this embodiment, the optical fiber signal input module 1 selects 3Gbps Video sftemporal Receiver, and the 3G optical fiber Receiver can receive data rate from 50Mbps to 2.97Gbps, and is compatible with SDI SMPTE259M, SMPTE 344M, SMPTE 292M and SMPTE 424M serial rates.
The SDI signal receiving module 2 is further connected to the HDMI signal transmitting module 3, and is configured to convert the differential signal into YUV format video data and IIS format audio data and output the YUV format video data and the IIS format audio data to the HDMI signal transmitting module 3. In the present embodiment, an SDI signal receiving module having a clock recovery function is used. Specifically, the SDI signal receiving module 2 selects GS2971, which supports four basic modes, namely SMPTE mode (default mode), DVB-ASI mode, Data-Through mode and standard by mode, comprises 8 channels of 48khz audio output and a path of audio clock generator, can filter extra Data, can use a 20-bit or 10-bit mode for a parallel bus, has error indication and correction characteristics, can generate HVF or CEA 861 timing signals, uses an SPI host interface, and comprises functions of SDI signal equalization, clock recovery and the like.
The HDMI signal transmitting module 3 is configured to convert the YUV format video data and the IIS format audio data into HDMI signals. In this embodiment, the HDMI signal transmitting module 3 selects IT66121, a mono HDMI transmitter with high performance and low power consumption, is fully compatible with HDCP HDMI 1.3a, HDCP 1.2, and DVI 1.0 specification, and the IT66121 also provides support for various video output formats with HDMI1.4 three-dimensional characteristics, supports 8 channels of I2S digital audio, has a sampling rate of 192kHz and a sample size of 24 bits, and supports a sampling rate of 192kHz for S/PDIF input.
The SDI signal driving module 4 is connected with the SDI signal receiving module 2 and used for receiving the differential signal sent by the SDI signal receiving module 2 and converting the differential signal into an SDI signal for loop output. In this embodiment, the SDI signal driving module 4 selects GV8500 and integrates a 75-ohm cable to drive a high-speed BiCMOS cable driver.
In the embodiment, the HDMI signal receiving module 6 selects L T8619C as the HDMI signal receiving module 6, and the HDMI/dual-mode DP input interface conforms to DVI V1.0 and HDMI V1.4, supports DVI up to 1.65Gbps, supports HDMI up to 3.4Gbps, supports HDMI resolution up to 4Kx2K @30Hz, supports 8/10/12 bits (bpc) of each component, supports CEC, supports HDCP decryption, supports EDID on-chip, and has a receiver end balanced up to 25dB and a L VDS output interface.
The encoding main processor module 9 is respectively connected with the SDI signal receiving module 2, the HDMI signal receiving module 6 and the switch module 11. The encoding main processor module 9 is configured to receive the audio data in the IIS format provided by the SDI signal receiving module 2 and the video signal in the BT1120 format provided by the HDMI signal receiving module 6, encode and convert the audio data into an RTSP network stream based on UDP, and transmit the RTSP network stream to each terminal device through the switch module 11. Specifically, the switch module 11 is connected to each terminal device through the BYPASS circuit module 12.
Specifically, the encoding main processor module 9 selects Haisi series Hi3521 processors, the Hi3521 is a professional high-end SOC chip developed for application of multi-channel D1 and multi-channel high-definition DVR and NVR products, the Hi3521 is internally provided with a high-performance A9 processor ARM Cortex A7 @ dual-core Max.1.3GHz and up to 8-channel D1 real-time multi-protocol encoding and decoding capability engines and special TOE network acceleration modules, H.265MAin Profile, L eL 5.0 encoding, H.265MAfil Profile, L eL 5.0 decoding, and the high-performance audio data and the video signals in IIS format and BT1120 format video signals are decoded, and are required for higher and higher applications and network requirements, and the video engines and the encoding and decoding algorithms are integrated and combined with multi-channel display output capability.
In this embodiment, the BYPASS circuit module 12 is designed using FTR-B4CA relay. The main function of the optical fiber encoder is to complete the power-off bypass function, so that when the optical fiber encoder is powered off, the terminal devices can communicate with each other to complete partial display function without affecting normal use.
Referring to fig. 2, in this embodiment, the device further includes an MCU main control module 5, where the MCU main control module 5 is respectively connected to the SDI signal receiving module 2, the HDMI signal transmitting module 3, and the HDMI signal receiving module 6, and is configured to configure the register. In the embodiment, the MCU main control module 5 selects N78E366A, the wide voltage input is 2.4V-5.5V, the frequency is 4MHz-48MHz, a high-precision RC crystal oscillator is arranged in the MCU main control module, the error is +/-1%, the speed of a 12T/6T acceleration mode is faster, and 5 paths of PWM output channels, SPI interfaces and ISP online programming are supported. And the MCU main control module 5 communicates with the SDI signal receiving module 2 through an SPI bus and communicates with the HDMI signal transmitting module 3 through an IIC bus so as to complete the function setting and register configuration of the SDI signal receiving module 2 and the HDMI signal transmitting module 3.
In this embodiment, the HDMI video signal receiving module further includes a memory module 7, where the memory module 7 is connected to the HDMI signal receiving module 6 and is used to store video conversion related configuration information required by the HDMI signal receiving module 6.
In this embodiment, the system further includes a delay shutdown circuit module 8, the delay shutdown circuit module 8 is connected to the encoding main processor module 9, and the encoding main processor module 9 performs delay shutdown through the delay shutdown circuit module 8. The delay shutdown circuit module 8 is a circuit constructed by a PNP triode, a diode, a resistor, a capacitor and the like in the prior art.
In this embodiment, the hard disk drive further includes a hard disk storage module 10, which is connected to the encoding main processor module 9, and the hard disk storage module 10 is a solid state hard disk with an mSATA interface. The main functions of the system are to be used as a storage carrier of system files or application programs, store larger video files and the like.
In this embodiment, the power supply module is further provided, and a DCDC or L DO power management chip is adopted, and its main function is to provide voltages of DC12V, DC5V, DC3.3V, dc1.8v, dc1.2v, and the like to power each module.
The optical fiber signal encoder in the embodiment is used for audio and video media information release, supports optical fiber signal input and network signal output, can simultaneously loop out 3G-SDI signals, has a network BYPASS function, can be simultaneously accessed into multiple paths of different terminal equipment, can transmit full high-definition video signals, and can realize transmission at an ultra-long distance of 20 kilometers. The encoder can receive optical fiber signals as media signal issuing equipment, can distribute the optical fiber signals into multiple paths of network streams to be output to the multimedia playing terminal, and can convert the optical fiber signals into one path of 3G-SDI signals to be looped out to the receiving equipment, so that ultra-long-distance high-definition media information issuing is realized, effective transmission of full-high-definition multimedia signals is realized, and multi-stage multi-mode distribution is realized.
Referring to fig. 3, the present invention further provides an optical fiber signal encoding method, which includes first converting an optical fiber signal into an HDMI signal through a first codec, then converting the HDMI signal into a BT1120 video signal, and then converting the BT1120 video signal into an RTSP network stream based on UDP through a second codec for network distribution.
Specifically, in the present embodiment, when converting the BT1120 video signal into the RTSP network stream based on the UDP, the h.265 encoding compression technology and the streaming media technology are mainly used.
H.265 coding, similar to h.264 macroblocks, h.265 partitions an image of a frame into non-overlapping tree units CTUs, intra-prediction uses reconstructed images of coded neighboring blocks to predict the current block, inter-prediction uses motion compensation to predict pixel values at non-integer positions in motion compensation by interpolation, and h.265 uses a deblocking filter in the coding loop to reduce blocking and ringing effects. The parallel coding technology aims at enhancing the parallel processing capability, and the H.265 standard introduces new characteristics of WPP, Slice, Tile parallel and the like.
The specific flow for realizing video coding is as follows: firstly calling an encoding function to establish a video encoding channel and setting channel properties, then binding the video encoding and processing channel, starting to receive data sent from a video processing subsystem after the video encoding channel is opened, starting to compress the data by using an H.265 encoding technology, and opening a video encoding module VENC. H.265 video coding is completed through function calling and the like, the VENC supports multi-channel real-time coding, each channel of coding is independent, the coding protocol and the coding profile can be different, the video coding is supported, and meanwhile, the Region scheduling module conducts shielding superposition on the content of the coded images.
VENC input sources: firstly, a user mode reads an image file and sends data to a coding module; secondly, the image collected by the video input module is sent to the video coding module through the video processing subsystem; and thirdly, directly sending the image acquired by the video input module to the encoding module. The streaming media technology is mainly characterized in that collected audio and video data are transmitted to a network server after being encoded and compressed, a real-time streaming protocol is used as a transport layer protocol, and is established on the basis of a user datagram protocol and used for providing end-to-end real-time transmission service for multimedia data transmitted in real time by utilizing the characteristic of low processing time of the user datagram protocol. RTSP belongs to an application layer protocol, and is a multimedia streaming protocol for controlling audio or video, which aims to control the sending connection of multiple data, and uses UDP to transmit streaming content during transmission, and its main task is to provide better playing performance for unicast or multicast video, and video resources can be local storage files in addition to live streaming. RTSP can select TCP, UDP, multicast UDP, etc. as a channel to transmit video data due to its better scalability.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. A fiber optic signal encoder, comprising: the system comprises an optical fiber signal input module (1), an SDI signal receiving module (2), an HDMI signal transmitting module (3), an SDI signal driving module (4), an HDMI signal receiving module (6), an encoding main processor module (9) and a switch module (11);
the optical fiber signal input module (1) is connected with the SDI signal receiving module (2) and used for converting an optical fiber signal into a differential signal and inputting the differential signal to the SDI signal receiving module (2);
the SDI signal receiving module (2) is also connected with the HDMI signal transmitting module (3) and is used for converting the differential signal into YUV format video data and IIS format audio data and outputting the YUV format video data and the IIS format audio data to the HDMI signal transmitting module (3);
the HDMI signal transmitting module (3) is used for converting YUV format video data and IIS format audio data into HDMI signals;
the SDI signal driving module (4) is connected with the SDI signal receiving module (2) and used for receiving the differential signal sent by the SDI signal receiving module (2) and converting the differential signal into an SDI signal for loop output;
the HDMI signal receiving module (6) is connected with the HDMI signal sending module (3) and is used for converting the HDMI signals into video signals in a BT1120 format;
the coding main processor module (9) is respectively connected with the SDI signal receiving module (2), the HDMI signal receiving module (6) and the switch module (11); the coding main processor module (9) is used for receiving the IIS format audio data provided by the SDI signal receiving module (2) and the BT1120 format video signal provided by the HDMI signal receiving module (6), coding and converting the audio data into UDP-based RTSP network streams, and then sending the RTSP network streams to each terminal device through the switch module (11).
2. The fiber signal encoder according to claim 1, wherein the encoding main processor module (9) converts the IIS format audio data and the BT1120 format video signal into the UDP-based RTSP network stream by h.265 encoding.
3. The optical fiber signal encoder according to claim 1, further comprising an MCU master control module (5), wherein the MCU master control module (5) is respectively connected to the SDI signal receiving module (2), the HDMI signal transmitting module (3), and the HDMI signal receiving module (6) for configuring the register.
4. A fiber optic signal encoder according to claim 3, further comprising a memory module (7), the memory module (7) being connected to the HDMI signal reception module (6) for storing video conversion related configuration information required by the HDMI signal reception module (6).
5. The optical fiber signal encoder according to claim 1, further comprising a delay shutdown circuit module (8), wherein the delay shutdown circuit module (8) is connected to the encoding main processor module (9), and the encoding main processor module (9) performs delay shutdown through the delay shutdown circuit module (8).
6. A fibre-optic signal encoder according to claim 1, further comprising a hard disk storage module (10) connected to the encoding main processor module (9).
7. A fibre-optic signal encoder as claimed in claim 1, characterized in that the switch module (11) is connected to the terminal devices via a BYPASS circuit module (12).
8. The fiber optic signal encoder of any of claims 1-7, further comprising a power supply module that employs a DCDC or L DO power management chip.
9. A fiber signal coding method is characterized in that a fiber signal is converted into an HDMI signal through first coding and decoding, the HDMI signal is converted into a BT1120 video signal, and then the BT1120 video signal is converted into an RTSP network stream based on UDP through secondary coding for network distribution.
10. The method for encoding an optical fiber signal according to claim 9, wherein the first encoding/decoding method comprises: the optical fiber signal is converted into a differential signal, the differential signal is converted into a YUV video signal and an IIS audio signal, and the YUV video signal and the IIS audio signal are converted into HDMI signals.
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| CN119135823A (en) * | 2024-11-12 | 2024-12-13 | 西安中飞航空测试技术发展有限公司 | An airborne CameraLink optical fiber video to network transmission device |
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Application publication date: 20200731 |