CN106454280B - Method for video transmission based on H.264 network video transmission system - Google Patents
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Abstract
The invention provides a video transmission system based on an H.264 network, which belongs to the technical field of video compression and comprises a DM365 high-definition processor, a client, a camera device, a NAND FLASH memory, an SDRAM chip, an alarm module and a wireless module, wherein the camera device, the NAND FLASH memory, the SDRAM chip, the alarm module and the wireless module are all connected with the DM365 high-definition processor; the DM365 high-definition processor is internally provided with a main control module, a VPFE module, a V4L2 driver interface, a video acquisition module, a video coding compression module, a video streaming media packing and transmitting module and a program operation monitoring module, wherein the VPFE module is respectively connected with the camera device, the V4L2 driver interface and the video acquisition module, the video acquisition module is sequentially connected with the video coding compression module and the video streaming media packing and transmitting module, and the video streaming media packing and transmitting module is connected with the client through a wireless module. The invention can solve the problem that the video compression process occupies a large amount of CPU resources due to the operation of the video coding compression algorithm, and the compressed and transmitted video has good definition and high quality.
Description
Technical Field
The invention relates to the technical field of video compression, in particular to a video transmission system based on an H.264 network.
Background
With the rapid development of multimedia and internet technologies and the popularization of digital information technologies, network video monitoring [1] is applied more and more widely in various aspects of production and life of people, and now the figures of network video monitoring are visible everywhere, such as traffic, communication, office areas, malls, supermarkets, banks, campuses, production workshops, living communities and the like, network video monitoring has penetrated into aspects of study, life and work of people, and production and life of people are safer and more convenient due to network video monitoring. The network video monitoring can be developed rapidly, and the advantages of the network video monitoring are not separated from the advantages of the network video monitoring, and the network video monitoring is visual, specific, vivid, efficient, rich in information and the like, so that the network video monitoring becomes a hotspot in informatization in China.
Network video monitoring is currently in the stage of vigorous development, and presents some problems in the development process: the network bandwidth is insufficient, the video is not clear enough, and the storage capacity is huge. These problems are all the problems to be solved in the development of network video monitoring, but after analysis, the problems can be found that the problems are only video coding and compression, and one superior video compression standard is realized. The compression ratio of the video pressed by the superior video compression standard can be increased, the video capacity can be reduced, the natural network bandwidth requirement can be reduced, and the required storage capacity can be reduced at the same time; the superior video compression standard presses out the video more clearly. From another perspective, if the video compression efficiency is not improved, a lot of equipment, manpower, capital and the like are required to be invested in to improve the network bandwidth, and the cost is too high, so that the improvement of the video compression efficiency is a good choice. Among the current video compression standards, the h.264 standard is considered as the next generation video compression standard by virtue of its superior performance. The h.264 standard is a new generation video compression standard [2] suitable for low-rate transmission, which is developed and researched vigorously by JVT (joint video team) established by two large video compression standard expert groups, MPEG (moving picture expert team) of ISO/IEC and VCEG (video coding expert team) of ITU. The H.264 adopts a simple design of regression, has high compression efficiency, and can save 50% of code rate at most on the premise of the same reconstruction video quality compared with the H.263 and the MPEG-4, thereby greatly reducing the storage capacity; meanwhile, the H.264 adopts the layered design of VCL and NAL, so that the H.264 has good network affinity and is very beneficial to network transmission.
Disclosure of Invention
The invention mainly aims to solve the problem that a large amount of CPU resources are occupied by running a video coding compression algorithm in the video compression process, and provides an H.264 network-based video transmission system capable of improving the real-time performance of the system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the H.264 network-based video transmission system comprises a DM365 high-definition processor, a client, a camera device, a NAND FLASH memory, an SDRAM chip, an alarm module and a wireless module, wherein the camera device, the NAND FLASH memory, the SDRAM chip, the alarm module and the wireless module are all connected with the DM365 high-definition processor; the DM365 high-definition processor is internally provided with a main control module, a VPFE module, a V4L2 driver interface, a video acquisition module for acquiring video data, a video coding compression module for compressing the video data acquired by the video module, a video streaming media packing and transmitting module for packing and transmitting the compressed video data, and a program operation monitoring module for monitoring the operation condition of the video acquisition module, the video coding compression module and the video streaming media packing and transmitting module and alarming by driving an alarm module through the main control module when the operation of the three modules is abnormal, wherein the VPFE module is respectively connected with a camera device, the V4L2 driver interface and the video acquisition module, the video acquisition module is sequentially connected with the video coding compression module and the video streaming media packing and transmitting module, and the video streaming media packing and transmitting module is connected with a client through a wireless module.
Further, the image pickup device is connected with the VPFE module through a VGA or HDMI interface on the DM365 high-definition processor, and is a CCD/CMOS camera or a video decoding device.
Further, the NAND FLASH memory adopts a K9F1G08UOA chip with the capacity of 1 Gb.
Further, the SDRAM chip adopts MT47H64M16HR-3:E chip with the capacity of 1 Gb.
Further, the DM365 high-definition processor is a TMS320DM365 digital media processor adopting a Linux operating system.
Further, the wireless module is composed of a CC2530 chip and comprises a CC2530 node and a CC2530 coordinator which are matched with each other, wherein the CC2530 node is communicated with the video streaming media packaging and sending module through a serial port, the CC2530 coordinator is communicated with a client through the serial port and the USB conversion module, and the CC2530 node and the CC2530 coordinator are communicated through a wireless network.
Further, the transmission method of the network video transmission system is as follows:
1) Acquiring video information: the camera equipment transmits the video information shot by the camera equipment to a DM365 high-definition processor through a VPFE module;
2) And (3) video acquisition: the video acquisition module invokes a program in a V4L2 driver interface through the VPFE module to initialize; then, the video acquisition module acquires an empty buffer from an input buffer queue thereof, acquires a frame of video data from the VPFE module, places the frame of video data in the empty buffer, then transmits the empty buffer to an output buffer queue of the video acquisition module for storage, and repeats the initialized acquisition mode until the video acquisition module completely acquires the video data in the VPFE module;
3) Video coding compression: the video coding compression module is initialized, and a video coding algorithm example is created in the initialization process; then, the video coding compression module acquires a data buffer in which one frame of video data is placed from an output buffer queue of the video acquisition module and acquires a standby buffer from an output buffer queue of the video streaming media packing and transmitting module, then invokes an algorithm processing function of the video coding algorithm example to compress the video data in the data buffer to obtain compressed video data conforming to the H.264 algorithm standard, and then places the compressed video data in the standby buffer and transmits the compressed video data back to an input buffer queue of the video streaming media packing and transmitting module; repeating the compression process until the video data in the cache queue is output by the video acquisition module after the compression;
4) Video packaging and sending: the video streaming media packaging and sending module adopts a datagram socket for initialization; then, the video streaming media packaging and transmitting module acquires a cache storing compressed video data from an input cache queue thereof, calls an RTP packaging and encapsulating function to carry out packaging treatment on the compressed video data in the cache to obtain an RTP data packet, transmits the RTP data packet to a wireless module through the datagram socket, and then transmits the RTP data packet to a client by the wireless module; after RTP data packets are sent, the buffer memory where the RTP data packets are located is sent to the step 3) for cyclic use in the video coding compression process through the output buffer memory queue of the video streaming media packing and sending module; repeating the initialized video packaging and transmitting process until the video streaming media packaging and transmitting module packages and transmits the compressed video data stored in the input cache queue;
5) Deleting a thread: when the main control module detects that the video acquisition module acquires video data in the VPFE module, the video encoding compression module compresses the video data in the video acquisition module output buffer queue and the video streaming media packaging and transmitting module packages and transmits the compressed video data stored in the video input buffer queue, the main control module drives the video acquisition module, the video encoding compression module and the video streaming media packaging and transmitting module to delete programs created in the respective initialization process and data information in the respective buffer queue.
Further, in the operation process of step 2), step 3) and step 4), the program operation monitoring module monitors the operation conditions of the video acquisition module, the video encoding compression module and the video streaming media packing and sending module, generates corresponding abnormal signals when the three have abnormal conditions and sends the corresponding abnormal signals to the main control module, and the main control module sends control instructions to the alarm module according to the received abnormal signals to prompt the alarm module to send an alarm.
Further, an abnormal data storage module is arranged in the main control module and is used for storing data information processed at the abnormal moment when the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are abnormal in operation, the abnormal data storage module and the alarm module are operated simultaneously, and when the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are restored to operate, the stored data information is returned to the corresponding module through the main control module.
Further, in the step 2) of video acquisition, when the video acquisition module is initialized, an open program of the V4L2 driver interface opens a VPFE module, acquires video data in the VPFE module, acquires an attribute of the video data through an ioctl program thereof, and then sends the attribute information to a main control module; the main control module is provided with a video attribute in advance, compares the received attribute information with the video attribute arranged in the main control module, and drives the ioctl program of the V4L2 driver interface to reset the attribute of the video data when the received attribute information is not equal to the video attribute arranged in the main control module so as to enable the attribute information to be equal to the video attribute arranged in the main control module.
The invention has the following beneficial effects:
the invention adopts a multithreaded programming system, so that a video acquisition module, a video coding compression module and a video streaming media packing and transmitting module can be independently processed without interference, and the running condition of each module is detected by arranging a program running monitoring module, and an alarm module is driven to give an alarm when the running of each module is abnormal, thereby a user can know the problem in the video compression process in time; moreover, by the arrangement, the problem that a large amount of CPU resources are occupied because of the need of running a video coding compression algorithm in the prior art can be solved, and the compressed and transmitted video has high resolution, clear pictures and good continuity when being decoded and played, so that the network video transmission system can reduce the CPU occupation amount, and the compressed video has high quality and good effect.
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Fig. 1 is a system block diagram of an h.264 network-based video transmission system according to the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, in a preferred embodiment of the present invention, an h.264 network-based video transmission system includes a DM365 high-definition processor, a client, a camera device, a NAND FLASH memory, an SDRAM chip, an alarm module and a wireless module, which are all connected to the DM365 high-definition processor. The camera equipment is connected with the VPFE module through a VGA or HDMI interface on the DM365 high-definition processor, and is a CCD/CMOS camera or video decoding equipment; the NAND FLASH memory adopts a K9F1G08UOA chip with the capacity of 1 Gb; the SDRAM chip adopts an MT47H64M16HR-3:E chip with the capacity of 1Gb, so that enough space is reserved for later development; the wireless module is composed of CC2530 chips and comprises mutually matched CC2530 nodes and a CC2530 coordinator, wherein the CC2530 nodes are communicated with a video streaming media packaging and sending module through serial ports, the CC2530 coordinator is communicated with a client through serial ports and a USB conversion module, the CC2530 nodes and the CC2530 coordinator are communicated through a wireless network, the system integration degree of the CC2530 chips is high, peripheral interfaces are powerful and abundant, and the application circuit of the system is few in external elements, so that the robot positioning system is simple in structure, simple and convenient in circuit and easy to install.
The DM365 high-definition processor is a TMS320DM365 digital media processor adopting a Linux operating system, wherein a main control module, a VPFE module, a V4L2 driver interface, a video acquisition module for acquiring video data, a video coding compression module for compressing the video data acquired by the video module, a video streaming media packing and transmitting module for packing and transmitting the compressed video data, and a program operation monitoring module for monitoring the operation condition of the video acquisition module, the video coding compression module and the video streaming media packing and transmitting module and driving an alarm module to alarm through the main control module when the operation of the three is abnormal are arranged in the TMS320DM365 digital media processor, wherein the VPFE module is respectively connected with a camera device, the V4L2 driver interface and the video acquisition module, the video acquisition module is sequentially connected with the video coding compression module and the video streaming media packing and transmitting module, and the video streaming media packing and transmitting module is connected with a client through a wireless module.
In the invention, the transmission method of the network video transmission system is as follows:
1) Acquiring video information: the camera equipment transmits the video information shot by the camera equipment to a DM365 high-definition processor through a VPFE module;
2) And (3) video acquisition: the video acquisition module calls a program in the V4L2 driver interface through the VPFE module to initialize, wherein the initialization is specifically that an open program of the V4L2 driver interface opens the VPFE module, acquires video data in the VPFE module, acquires the attribute of the video data through an ioctl program of the video acquisition module, and then sends the attribute information to the main control module; the main control module is provided with a video attribute in advance, compares the received attribute information with the video attribute arranged in the main control module, and drives the ioctl program of the V4L2 driver interface to reset the attribute of the video data when the received attribute information is not equal to the video attribute arranged in the main control module so as to enable the attribute information to be equal to the video attribute arranged in the main control module; then, the video acquisition module acquires an empty buffer from an input buffer queue thereof, acquires a frame of video data from the VPFE module, places the frame of video data in the empty buffer, and then transmits the empty buffer to an output buffer queue of the video acquisition module for storage so as to be acquired and compressed by the video coding compression module; then, repeating the initialized acquisition mode until the video acquisition module completely acquires the video data in the VPFE module;
3) Video coding compression: the video coding compression module is initialized, and a video coding algorithm example is created in the initialization process, wherein the initialization is specifically that an Engine is initialized through a CERuntime_init () function, then a coding and decoding Engine is opened through a file operation Engine_open () function, and after the Engine is successfully opened, a video coding algorithm example is created through a VIDENC_create () function; then, the video coding compression module acquires a data buffer in which a frame of video data is placed from an output buffer queue of the video acquisition module and acquires a standby buffer from an output buffer queue of the video streaming media packing and transmitting module, then invokes an algorithm processing function of a video coding algorithm example to compress the video data in the data buffer to obtain compressed video data conforming to the H.264 algorithm standard, and then places the compressed video data in the standby buffer and transmits the compressed video data back to an input buffer queue of the video streaming media packing and transmitting module for processing by the video streaming media packing and transmitting module; repeating the compression process until the video data in the cache queue is output by the video acquisition module after the compression;
4) Video packaging and sending: the video streaming media packaging and sending module adopts datagram sockets to initialize, and the specific initialization steps are that firstly, a socket is opened through a socket () function, and after the socket is successfully opened, the socket attribute is set through a setsockopt () function, so that the initialization can be completed; then, the video streaming media packaging and transmitting module acquires a cache storing compressed video data from an input cache queue thereof, invokes an RTP packaging and encapsulating function to carry out packaging treatment on the compressed video data in the cache to obtain an RTP data packet, and transmits the RTP data packet to the wireless module through a datagram socket, and then the wireless module transmits the RTP data packet to the client; after RTP data packets are sent, the buffer memory where the RTP data packets are located is sent to the step 3) for cyclic use in the video coding compression process through an output buffer memory queue of a video streaming media packing and sending module; repeating the initialized video packaging and transmitting process until the video streaming media packaging and transmitting module packages and transmits the compressed video data stored in the input cache queue;
5) Deleting a thread: when the main control module detects that the video acquisition module acquires video data in the VPFE module, the video encoding compression module compresses the video data in the video acquisition module output buffer queue and the video streaming media packaging and transmitting module packages and transmits the compressed video data stored in the video input buffer queue, the main control module drives the video acquisition module, the video encoding compression module and the video streaming media packaging and transmitting module to delete programs created in the respective initialization process and data information in the respective buffer queue.
Further, in the operation process of step 2), step 3) and step 4), the program operation monitoring module monitors the operation conditions of the video acquisition module, the video encoding compression module and the video streaming media packing and sending module, generates corresponding abnormal signals when the three have abnormal conditions and sends the corresponding abnormal signals to the main control module, and the main control module sends control instructions to the alarm module according to the received abnormal signals to prompt the alarm module to send an alarm.
In addition, an abnormal data storage module is arranged in the main control module and is used for storing data information processed at the abnormal moment when the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are abnormal in operation, the abnormal data storage module and the alarm module are operated simultaneously, and the stored data information is returned to the corresponding module through the main control module when the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are restored to be operated.
In the invention, the initialization of the video acquisition module, the video encoding compression module and the video streaming media packing and sending module is synchronously carried out, and the processes after the initialization of the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are carried out after the initialization of the video acquisition module, the video encoding compression module and the video streaming media packing and sending module is finished.
In the invention, the main task of the video acquisition module is to acquire original high-definition video data through a VGA or HDMI interface on a 3GDM365_TX board, compress the video data into a certain format and store the format in a memory buffer area for subsequent video compression coding, which is the basis of the whole system, and the acquisition speed and the acquired video quality directly influence the performance of the whole system; the video coding compression module mainly aims at calling a processing function of an encoding engine algorithm example to compress a designated encoding format algorithm for frame video data captured by an acquisition thread, and storing the compressed video data in a memory buffer area for subsequent video streaming media, wherein the video coding compression module is a core of the whole system, and the encoding compression speed directly influences the performance of the whole system; the main task of the video stream media packing and sending module is to package the H.264 video obtained after the video encoding compression thread is processed according to the real-time transmission stream RTP format, then send the packaged video stream to the client for decoding and playing through the network socket, and the played video has high resolution, clear pictures and good continuity.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (7)
1. A transmission method for video transmission based on an H.264 network video transmission system is characterized in that: the network video transmission system comprises a DM365 high-definition processor, a client, a camera device, a NAND FLASH memory, an SDRAM chip, an alarm module and a wireless module, wherein the camera device, the NAND FLASH memory, the SDRAM chip, the alarm module and the wireless module are all connected with the DM365 high-definition processor; the DM365 high-definition processor is internally provided with a main control module, a VPFE module, a V4L2 driver interface, a video acquisition module for acquiring video data, a video coding compression module for compressing the video data acquired by the video module, a video streaming media packing and transmitting module for packing and transmitting the compressed video data, and a program operation monitoring module for monitoring the operation condition of the video acquisition module, the video coding compression module and the video streaming media packing and transmitting module and driving an alarm module to alarm through the main control module when the operation of the three modules is abnormal, wherein the VPFE module is respectively connected with a camera device, the V4L2 driver interface and the video acquisition module, the video acquisition module is sequentially connected with the video coding compression module and the video streaming media packing and transmitting module, and the video streaming media packing and transmitting module is connected with a client through a wireless module;
the transmission method of the network video transmission system comprises the following steps:
1) Acquiring video information: the camera device transmits the video information shot by the camera device to the DM365 high-definition processor through the VPFE module;
2) And (3) video acquisition: the video acquisition module invokes a program in a V4L2 driver interface through the VPFE module to initialize; then, the video acquisition module acquires an empty buffer from an input buffer queue thereof, acquires a frame of video data from the VPFE module, places the frame of video data in the empty buffer, then transmits the empty buffer to an output buffer queue of the video acquisition module for storage, and repeats the initialized acquisition mode until the video acquisition module completely acquires the video data in the VPFE module;
3) Video coding compression: the video coding compression module is initialized, and a video coding algorithm example is created in the initialization process; then, the video coding compression module acquires a data buffer in which one frame of video data is placed from an output buffer queue of the video acquisition module and acquires a standby buffer from an output buffer queue of the video streaming media packing and transmitting module, then invokes an algorithm processing function of the video coding algorithm example to compress the video data in the data buffer to obtain compressed video data conforming to the H.264 algorithm standard, and then places the compressed video data in the standby buffer and transmits the compressed video data back to an input buffer queue of the video streaming media packing and transmitting module; repeating the compression process until the video data in the cache queue is output by the video acquisition module after the compression;
4) Video packaging and sending: the video streaming media packaging and sending module adopts a datagram socket for initialization; then, the video streaming media packaging and transmitting module acquires a cache storing compressed video data from an input cache queue thereof, calls an RTP packaging and encapsulating function to carry out packaging treatment on the compressed video data in the cache to obtain an RTP data packet, transmits the RTP data packet to a wireless module through the datagram socket, and then transmits the RTP data packet to a client by the wireless module; after RTP data packets are sent, the buffer memory where the RTP data packets are located is sent to the step 3) for cyclic use in the video coding compression process through the output buffer memory queue of the video streaming media packing and sending module; repeating the initialized video packaging and transmitting process until the video streaming media packaging and transmitting module packages and transmits the compressed video data stored in the input cache queue;
5) Deleting a thread: when the main control module detects that the video acquisition module acquires video data in the VPFE module, the video encoding compression module compresses the video data in the video acquisition module output buffer queue and the video streaming media packaging and transmitting module packages and transmits the compressed video data stored in the video input buffer queue, the main control module drives the video acquisition module, the video encoding compression module and the video streaming media packaging and transmitting module to delete programs created in the respective initialization process and data information in the respective buffer queue;
the program operation monitoring module monitors the operation conditions of the video acquisition module, the video encoding compression module and the video streaming media packing and sending module in the operation processes of the step 2), the step 3) and the step 4), generates corresponding abnormal signals when the three have abnormal conditions and sends the corresponding abnormal signals to the main control module, and the main control module sends control instructions to the alarm module according to the received abnormal signals to prompt the alarm module to send an alarm;
the step 2) of the video acquisition process, when the video acquisition module is initialized, an open program of the V4L2 driver interface opens a VPFE module, acquires video data in the VPFE module, acquires attributes of the video data through an ioctl program of the video data, and then sends the attribute information to a main control module; the main control module is provided with a video attribute in advance, compares the received attribute information with the video attribute arranged in the main control module, and drives the ioctl program of the V4L2 driver interface to reset the attribute of the video data when the received attribute information is not equal to the video attribute arranged in the main control module so as to enable the attribute information to be equal to the video attribute arranged in the main control module.
2. The transmission method for video transmission based on the h.264 network video transmission system as set forth in claim 1, wherein: the camera device is connected with the VPFE module through a VGA or HDMI interface on the DM365 high-definition processor, and is a CCD/CMOS camera or video decoding equipment.
3. The transmission method for video transmission based on the h.264 network video transmission system as set forth in claim 1, wherein: the NAND FLASH memory adopts a K9F1G08UOA chip with the capacity of 1 Gb.
4. The transmission method for video transmission based on the h.264 network video transmission system as set forth in claim 1, wherein: the SDRAM chip adopts MT47H64M16HR-3:E chip with the capacity of 1 Gb.
5. The transmission method for video transmission based on the h.264 network video transmission system as set forth in claim 1, wherein: the DM365 high-definition processor is a TMS320DM365 digital media processor adopting a Linux operating system.
6. The transmission method for video transmission based on the h.264 network video transmission system as set forth in claim 1, wherein: the wireless module is composed of CC2530 chips and comprises CC2530 nodes and a CC2530 coordinator which are matched with each other, wherein the CC2530 nodes are communicated with a video streaming media packing and sending module through a serial port, the CC2530 coordinator is communicated with a client through the serial port and a USB conversion module, and the CC2530 nodes and the CC2530 coordinator are communicated through a wireless network.
7. The transmission method for video transmission based on the h.264 network video transmission system as set forth in claim 1, wherein: the main control module is internally provided with an abnormal data storage module which is used for storing data information processed at the abnormal moment when the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are abnormal in operation, the abnormal data storage module and the alarm module are operated simultaneously, and the stored data information is returned to the corresponding module through the main control module when the video acquisition module, the video encoding compression module and the video streaming media packing and sending module are restored to be operated.
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