CN113965282B - Emergency broadcasting method for multimedia IP outdoor terminal - Google Patents
Emergency broadcasting method for multimedia IP outdoor terminal Download PDFInfo
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- CN113965282B CN113965282B CN202111175900.6A CN202111175900A CN113965282B CN 113965282 B CN113965282 B CN 113965282B CN 202111175900 A CN202111175900 A CN 202111175900A CN 113965282 B CN113965282 B CN 113965282B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides an emergency broadcasting method of a multimedia IP outdoor terminal, which belongs to the technical field of emergency broadcasting and comprises the following steps: step S10, the outdoor terminal acquires multimedia data through an IP communication protocol; step S20, the outdoor terminal checks the multimedia data; step S30, the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expansion data; step S40, the outdoor terminal stores the data to be broadcasted and the expansion data to a designated file path based on the data type, or directly performs emergency broadcasting; step S50, the outdoor terminal reads the data to be broadcasted and the expansion data from the file path, and emergency broadcasting is carried out on the data to be broadcasted through the expansion data; and step S60, the outdoor terminal monitors emergency broadcasting of each data to be broadcasted, and uploads the broadcasting record obtained by monitoring to the server. The invention has the advantages that: the outdoor terminal can support multimedia emergency broadcasting, and the application range is greatly improved.
Description
Technical Field
The invention relates to the technical field of emergency broadcasting, in particular to an emergency broadcasting method of a multimedia IP outdoor terminal.
Background
Currently, terminals in an emergency broadcast system are classified into the following 8 types: 1. a cable television terminal; 2. a terrestrial television terminal; 3. a direct broadcast star terminal; 4. mobile multimedia; 5. a personal radio; 6. urban public broadcasting; 7. a large horn terminal; 8. the new media terminal is not incorporated into the outdoor terminal; the standard specification of the emergency broadcast communication technology defines the outdoor terminal as a multimode sound column and a multimode transceiver, and defines media transmitted by the outdoor terminal as audio, namely only defines audio transmission rules of the outdoor terminal, does not define transmission rules of pictures and videos, and limits application scenes of the outdoor terminal.
Therefore, how to provide an emergency broadcasting method for an outdoor terminal of a multimedia IP, so as to enable the outdoor terminal to support emergency broadcasting of multimedia, so as to improve the application range, is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing an emergency broadcasting method for a multimedia IP outdoor terminal, which can enable the outdoor terminal to support multimedia emergency broadcasting so as to improve the application range.
The invention is realized in the following way: an emergency broadcasting method of a multimedia IP outdoor terminal comprises the following steps:
step S10, the outdoor terminal acquires multimedia data through an IP communication protocol, wherein the data type of the multimedia data is pictures, file videos or live videos;
step S20, the outdoor terminal checks the multimedia data;
step S30, the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expansion data;
step S40, the outdoor terminal stores the data to be broadcasted and the expansion data to a designated file path based on the data type, or directly performs emergency broadcasting;
step S50, the outdoor terminal reads the data to be broadcasted and the extension data from the file path, and emergency broadcasting is carried out on the data to be broadcasted through the extension data;
and step S60, the outdoor terminal monitors the emergency broadcasting of each piece of data to be broadcasted, and uploads the broadcasting record obtained by monitoring to the server.
Further, the step S10 specifically includes:
step S11, after the outdoor terminal is started, sending heartbeat data to a server through an IP communication protocol;
step S12, the server feeds back response data allowing connection to the outdoor terminal based on the received heartbeat data;
step S13, the outdoor terminal establishes heartbeat connection with a server based on the received response data;
step S14, the server performs CRC calculation on each piece of data to be broadcasted to obtain a first check code, packages and compresses each piece of data to be broadcasted and the first check code based on an auxiliary data format to obtain multimedia data, and generates a URL address associated with the multimedia data;
step S15, the server sends an opening instruction carrying the URL address to the outdoor terminal;
and S16, the outdoor terminal analyzes the received opening instruction to obtain a URL address, and downloads the multimedia data through the URL address, wherein the data type of the multimedia data is pictures, file videos or live videos.
Further, in the step S14, the content of the auxiliary data format includes an auxiliary data amount, a data type, an auxiliary data length, an auxiliary data content, and extension data;
the auxiliary data number value is 1; the data type is pictures, file videos or live videos; the picture is a PNG picture, a JPEG picture or a GIF picture; the auxiliary data content is data to be broadcasted; the extension data comprises broadcasting task information, multimedia information and transitional effect information;
the broadcasting task information at least comprises the total number of files, the total number of transitional effects, the display sequence, tail frame processing identification, task types, starting time, ending time, cycle times and the number of simultaneous broadcasting; the tail frame processing identifier is used for identifying whether the last frame of picture is reserved or not; the task type is timing broadcast or cyclic broadcast;
the multimedia information at least comprises a multimedia ID, a check code, a multimedia width and height, a display duration, a display position, a filter effect and a coding format;
the transition effect information at least comprises a transition effect ID, a switching interval time, a switching mode, a display starting time and a display ending time; the switching mode at least comprises translation, scaling, rotation and blurring.
Further, the step S20 specifically includes:
step S21, the outdoor terminal decompresses the multimedia data based on the auxiliary data format to obtain auxiliary data quantity, auxiliary data type, auxiliary data length, auxiliary data content and extension data;
step S22, the outdoor terminal acquires data to be broadcasted from the auxiliary data content, performs CRC calculation on the acquired data to be broadcasted to obtain a second check code, judges whether the second check code is equal to a first check code carried in the extension data, if so, passes the check, and enters step S30; if not, the verification fails, and the step S23 is carried out;
step S23, judging whether the number of times of verification failure exceeds a set number of times threshold, if so, sending response data of the failure in downloading to a server, and ending the flow; if not, the process proceeds to step S10.
Further, the step S30 specifically includes:
and the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expanded data comprising broadcasting task information, multimedia information and transitional effect information.
Further, the step S40 specifically includes:
step S41, the outdoor terminal judges the data type of the multimedia data, and if the multimedia data is a live video, the step S42 is entered; if the video is a picture or a file video, the step S43 is entered;
step S42, the outdoor terminal directly decodes the data to be broadcasted through ffmpeg software and performs emergency broadcasting based on the expansion data;
step S43, the outdoor terminal performs information abstract calculation on the data to be broadcasted to obtain an MD5 value, judges whether a designated file path has a file with the same name as the MD5 value, and if so, ends the flow; if not, go to step S44;
step S44, the outdoor terminal judges whether the residual storage space of the designated file path can meet the storage requirement, if so, the step S45 is entered; if not, circularly judging and deleting the related files which are not related to the broadcasting task information until the storage requirement is met, and entering step S45;
step S45, the outdoor terminal renames the data to be broadcasted through an MD5 value and stores the renamed data into a designated file path, writes broadcasting task information, multimedia information and transitional effect information in the extended data into a data table respectively, adds the MD5 value into each data table as an index, and stores each data table into the designated file path.
Further, in the step S50, when the data type of the data to be broadcast is a picture, the method specifically includes the following steps:
step S511, the outdoor terminal reads the data to be broadcasted and the corresponding expansion data with the data type of pictures from the file path and then performs clock synchronization with the Internet;
step S512, the outdoor terminal judges whether the current time is the starting time carried by the extended data, if yes, the step S513 is carried out; if not, waiting for the current time to reach the starting time and proceeding to step S513;
step S513, the outdoor terminal loads the data to be broadcasted into a memory, and plays the data in sequence according to the display sequence carried by the extended data; in the playing process, based on the filter effect and the transitional effect information carried by the extension data, loading the filters of the data to be broadcasted and the transitional animation when the data to be broadcasted are switched through a libjpeg library;
step S514, the outdoor terminal judges whether the current playing times meet the cycle times carried by the expansion data, if yes, the step S515 is carried out; if not, go to step S513;
step 515, the outdoor terminal reserves or clears the last frame of picture played based on the tail frame processing identifier carried by the extended data.
Further, in the step S50, when the data type of the data to be broadcast is a file video, the method specifically includes the following steps:
step S521, the outdoor terminal reads the data to be broadcasted and the corresponding expansion data with the data type of the file video from the file path and then performs clock synchronization with the Internet;
step S522, the outdoor terminal judges whether the current time is the starting time carried by the extended data, if yes, the step S523 is entered; if not, waiting for the current time to reach the starting time, and proceeding to step S523;
step S523, the outdoor terminal judges whether the resolution of the data to be broadcast is smaller than 1080P, if yes, the data to be broadcast is a non-high definition video, all file videos of the data to be broadcast are loaded into a memory, playing is carried out based on the number of simultaneous playing carried by the expansion data, and step S524 is carried out; if not, the data to be broadcasted is a high-definition video, one of the file videos of the data to be broadcasted is loaded into a memory for playing, and step S524 is entered;
step S524, the outdoor terminal judges whether the current playing times meet the cycle times carried by the expansion data, if yes, the step S525 is carried out; if not, go to step S523;
and step S525, the outdoor terminal reserves or clears the last frame of picture to be played based on the tail frame processing identifier carried by the extension data.
Further, the step S60 specifically includes:
the outdoor terminal monitors the emergency broadcasting of the data to be broadcasted through mutually independent monitoring threads respectively, and uploads the broadcasting records obtained through monitoring to the server.
The invention has the advantages that:
1. by adding the extension data in the auxiliary data format, the broadcasting task information, the multimedia information and the transitional effect information of the multimedia data are defined, namely, the standard specification of the emergency broadcasting communication technology is extended, the receiving channel of the multimedia data is increased, and then the ffmpeg encoding and decoding technology and the IP transmission channel technology are combined, so that the outdoor terminal can support the emergency broadcasting of multimedia (pictures, file videos and live videos) and the application range of the outdoor terminal is greatly improved.
2. By setting the value of the auxiliary data quantity to be 1, the data to be broadcasted is packed and compressed, namely, a plurality of data to be broadcasted are packed and compressed into 1 data packet, for example, a plurality of pictures are required to be broadcasted, the plurality of pictures are packed and compressed into 1 data packet, the transmission bandwidth is greatly reduced, and the outdoor terminal can receive and process all the data to be broadcasted at the same time, so that the broadcasting time delay is greatly reduced.
3. The MD5 value is renamed for the data to be broadcast, and is used as the index value of the data table corresponding to the broadcasting task information, the multimedia information and the transitional effect information, so that repeated storage of the same file is avoided, the storage space is wasted, the data retrieval efficiency is greatly improved, and the broadcasting time delay is further reduced.
4. When the storage space is insufficient, deleting related files of the unassociated broadcasting task information, so that the utilization rate of the storage space is greatly improved, and redundant data is reduced.
5. By synchronizing the clock with the Internet before emergency broadcasting, the timely broadcasting of the emergency broadcasting is ensured, namely the timeliness of the emergency broadcasting is ensured.
6. The CRC is carried out on the data to be broadcasted, the integrity of the data to be broadcasted is verified, the defect or tampered multimedia data are prevented from being broadcasted, and the safety of emergency broadcasting is greatly improved.
7. Before emergency broadcasting is carried out on the file video, whether the file video is the high-definition video is verified, if so, only one file video is played for the high-definition video at a time, and the situation that a decoder decodes a plurality of high-definition videos simultaneously to cause decoding failure is avoided.
8. The emergency broadcasting of each data to be broadcasted is monitored through mutually independent monitoring threads, so that the data to be broadcasted of different data types can be simultaneously subjected to emergency broadcasting, and the flexibility of the emergency broadcasting is greatly improved.
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The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
Fig. 1 is a flowchart of an emergency broadcasting method of a multimedia IP outdoor terminal according to the present invention.
Detailed Description
According to the technical scheme in the embodiment of the application, the overall thought is as follows: by adding the extension data in the auxiliary data format, the broadcasting task information, the multimedia information and the transitional effect information of the multimedia data are defined, namely, the standard specification of the emergency broadcasting communication technology is extended, so that the outdoor terminal supports the emergency broadcasting of the multimedia, and the application range of the outdoor terminal is improved.
Referring to fig. 1, a preferred embodiment of the emergency broadcasting method for a multimedia IP outdoor terminal of the present invention includes the following steps:
step S10, the outdoor terminal acquires multimedia data through an IP communication protocol, wherein the data type of the multimedia data is pictures, file videos or live videos;
step S20, the outdoor terminal checks the multimedia data;
step S30, the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expansion data;
step S40, the outdoor terminal stores the data to be broadcasted and the expansion data to a designated file path based on the data type, or directly performs emergency broadcasting;
step S50, the outdoor terminal reads the data to be broadcasted and the extension data from the file path, and emergency broadcasting is carried out on the data to be broadcasted through the extension data;
and step S60, the outdoor terminal monitors the emergency broadcasting of each piece of data to be broadcasted, and uploads the broadcasting record obtained by monitoring to the server.
The step S10 specifically includes:
step S11, after the outdoor terminal is started, sending heartbeat data to a server through an IP communication protocol;
step S12, the server feeds back response data allowing connection to the outdoor terminal based on the received heartbeat data;
step S13, the outdoor terminal establishes heartbeat connection with a server based on the received response data;
step S14, the server performs CRC calculation on each piece of data to be broadcasted to obtain a first check code, packages and compresses each piece of data to be broadcasted and the first check code based on an auxiliary data format to obtain multimedia data, encrypts the multimedia data by using a national secret SM2 algorithm or a national secret SM3 algorithm, and generates a URL address related to the multimedia data; for example, when a plurality of pictures are to be transmitted for broadcasting, only one compressed file is packed to reduce the transmission bandwidth;
step S15, the server sends an opening instruction carrying the URL address to the outdoor terminal;
and S16, the outdoor terminal analyzes the received opening instruction to obtain a URL address, and downloads the multimedia data through the URL address, wherein the data type of the multimedia data is pictures, file videos or live videos. In specific implementation, the outdoor terminal records the downloading time of each multimedia data.
In the step S14, the content of the auxiliary data format includes an auxiliary data amount, a data type, an auxiliary data length, an auxiliary data content and extension data; the auxiliary data quantity, the data type, the auxiliary data length, the auxiliary data content and the extension data adopt a JSON format; the extension data is used for realizing the receiving and playing of the multimedia data;
the auxiliary data number value is 1; the data type is pictures, file videos or live videos; the picture is a PNG picture, a JPEG picture or a GIF picture; the auxiliary data content is data to be broadcasted; the extension data comprises broadcasting task information, multimedia information and transitional effect information; the data type identifiers of the PNG picture, the JPEG picture, the GIF picture, the file video and the live video as well as the extension data are respectively 41, 42, 43, 61 and 62, and 62 are reserved data types, so that the packaging and issuing of standard data are not affected;
the broadcasting task information at least comprises the total number of files, the total number of transitional effects, the display sequence, tail frame processing identification, task types, starting time, ending time, cycle times and the number of simultaneous broadcasting; the tail frame processing identifier is used for identifying whether the last frame of picture is reserved or not; the task type is timing broadcast or cyclic broadcast; the number of simultaneous plays is preferably 4, namely the number of simultaneous plays of the file videos is limited;
the multimedia information at least comprises a multimedia ID, a check code, a multimedia width and height, a display duration, a display position, a filter effect and a coding format; the display position is the display position on the screen;
the transition effect information at least comprises a transition effect ID, a switching interval time, a switching mode, a display starting time and a display ending time; the switching mode at least comprises translation, scaling, rotation and blurring.
The sub-parameters of the translation include upward translation, downward translation, leftward translation, and rightward translation; the scaled sub-parameters include zoom-in and zoom-out; the sub-parameters of the rotation include clockwise rotation and counterclockwise rotation; the blur is preferably a gaussian blur; the translation is realized by adopting a double-buffer technology; the scaling and rotation are implemented by the libjpeg library.
The step S20 specifically includes:
step S21, after decrypting the multimedia data by using a national secret SM2 algorithm or a national secret SM3 algorithm, the outdoor terminal decompresses the multimedia data based on an auxiliary data format to obtain auxiliary data quantity, auxiliary data type, auxiliary data length, auxiliary data content and extension data; the multimedia data is encrypted and decrypted through a national secret SM2 algorithm or a national secret SM3 algorithm, so that the security of emergency broadcasting is greatly improved;
step S22, the outdoor terminal acquires data to be broadcasted from the auxiliary data content, performs CRC calculation on the acquired data to be broadcasted to obtain a second check code, judges whether the second check code is equal to a first check code carried in the extension data, if so, passes the check, and enters step S30; if not, the verification fails, and the step S23 is carried out;
step S23, judging whether the number of times of verification failure exceeds a set number of times threshold, if so, sending response data of the failure in downloading to a server, and ending the flow; if not, the process proceeds to step S10. The number threshold is preferably 3, that is, the number of check failures exceeds 3, and the download failure is fed back to the server.
The step S30 specifically includes:
and the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expanded data comprising broadcasting task information, multimedia information and transitional effect information.
The step S40 specifically includes:
step S41, the outdoor terminal judges the data type of the multimedia data, and if the multimedia data is a live video, the step S42 is entered; if the video is a picture or a file video, the step S43 is entered;
step S42, the outdoor terminal directly decodes the data to be broadcasted through ffmpeg software and performs emergency broadcasting based on the expansion data; namely, the live video adopts an RTMP mode (Real Time Messaging Protocol/real-time message transmission protocol), is directly decoded and played, is not stored locally, and only plays one path of live video at the same time;
step S43, the outdoor terminal performs information abstract calculation on the data to be broadcasted to obtain an MD5 value, judges whether a file with the same name as the MD5 value exists in a designated file path (namely, traverses all projects and judges whether repeated files exist), and if yes, ends the flow; if not, go to step S44;
step S44, the outdoor terminal judges whether the residual storage space of the designated file path can meet the storage requirement, if so, the step S45 is entered; if not, circularly judging and deleting the related files which are not related to the broadcasting task information until the storage requirement is met, and entering step S45;
step S45, the outdoor terminal renames the data to be broadcasted through an MD5 value and stores the renamed data into a designated file path, writes broadcasting task information, multimedia information and transitional effect information in the extended data into a data table respectively, adds the MD5 value into each data table as an index, and stores each data table into the designated file path.
In the step S50, when the data type of the data to be broadcast is a picture, the method specifically includes the following steps:
step S511, the outdoor terminal reads the data to be broadcasted and the corresponding expansion data with the data type of pictures from the file path and then performs clock synchronization with the Internet;
step S512, the outdoor terminal judges whether the current time is the starting time carried by the extended data, if yes, the step S513 is carried out; if not, waiting for the current time to reach the starting time and proceeding to step S513;
step S513, the outdoor terminal loads the data to be broadcasted into a memory, and plays the data in sequence according to the display sequence carried by the extended data; in the playing process, based on the filter effect and the transitional effect information carried by the extension data, loading the filters of the data to be broadcasted and the transitional animation when the data to be broadcasted are switched through a libjpeg library;
sequentially carrying out full-area filter processing on each picture through a libjpeg library; simultaneously caching the picture played in the secondary and the picture to be played next through a double-buffering technology, namely processing two pictures in the cache every second by a libjpeg library to obtain transition animation; and the transition data parameters need to be calculated before emergency broadcasting, and the formula is as follows: transition data parameter = path parameter/switching interval time; the path parameters are acquired based on different transition effect information, for example, the path parameters are the width of the picture when the path parameters are horizontally shifted, the path parameters are the height of the picture when the path parameters are vertically shifted, the path parameters are rotation angles when the path parameters are rotated, and the path parameters are scaling multiples when the path parameters are scaled;
step S514, the outdoor terminal judges whether the current playing times meet the cycle times carried by the expansion data, if yes, the step S515 is carried out; if not, go to step S513;
step 515, the outdoor terminal reserves or clears the last frame of picture played based on the tail frame processing identifier carried by the extended data.
In the step S50, when the data type of the data to be broadcast is a file video, the method specifically includes the following steps:
step S521, the outdoor terminal reads the data to be broadcasted and the corresponding expansion data with the data type of the file video from the file path and then performs clock synchronization with the Internet;
step S522, the outdoor terminal judges whether the current time is the starting time carried by the extended data, if yes, the step S523 is entered; if not, waiting for the current time to reach the starting time, and proceeding to step S523;
step S523, the outdoor terminal judges whether the resolution of the data to be broadcast is smaller than 1080P, if yes, the data to be broadcast is a non-high definition video, all file videos of the data to be broadcast are loaded into a memory, playing is carried out based on the number of simultaneous playing carried by the expansion data, and step S524 is carried out; if not, the data to be broadcasted is a high-definition video, one of the file videos of the data to be broadcasted is loaded into a memory for playing, and step S524 is entered; when playing the file video, the OSD graphic layer is displayed on the video layer;
step S524, the outdoor terminal judges whether the current playing times meet the cycle times carried by the expansion data, if yes, the step S525 is carried out; if not, go to step S523;
and step S525, the outdoor terminal reserves or clears the last frame of picture to be played based on the tail frame processing identifier carried by the extension data.
The step S60 specifically includes:
the outdoor terminal monitors the emergency broadcasting of the data to be broadcasted through mutually independent monitoring threads respectively, and uploads the broadcasting records obtained through monitoring to the server.
In summary, the invention has the advantages that:
1. by adding the extension data in the auxiliary data format, the broadcasting task information, the multimedia information and the transitional effect information of the multimedia data are defined, namely, the standard specification of the emergency broadcasting communication technology is extended, the receiving channel of the multimedia data is increased, and then the ffmpeg encoding and decoding technology and the IP transmission channel technology are combined, so that the outdoor terminal can support the emergency broadcasting of multimedia (pictures, file videos and live videos) and the application range of the outdoor terminal is greatly improved.
2. By setting the value of the auxiliary data quantity to be 1, the data to be broadcasted is packed and compressed, namely, a plurality of data to be broadcasted are packed and compressed into 1 data packet, for example, a plurality of pictures are required to be broadcasted, the plurality of pictures are packed and compressed into 1 data packet, the transmission bandwidth is greatly reduced, and the outdoor terminal can receive and process all the data to be broadcasted at the same time, so that the broadcasting time delay is greatly reduced.
3. The MD5 value is renamed for the data to be broadcast, and is used as the index value of the data table corresponding to the broadcasting task information, the multimedia information and the transitional effect information, so that repeated storage of the same file is avoided, the storage space is wasted, the data retrieval efficiency is greatly improved, and the broadcasting time delay is further reduced.
4. When the storage space is insufficient, deleting related files of the unassociated broadcasting task information, so that the utilization rate of the storage space is greatly improved, and redundant data is reduced.
5. By synchronizing the clock with the Internet before emergency broadcasting, the timely broadcasting of the emergency broadcasting is ensured, namely the timeliness of the emergency broadcasting is ensured.
6. The CRC is carried out on the data to be broadcasted, the integrity of the data to be broadcasted is verified, the defect or tampered multimedia data are prevented from being broadcasted, and the safety of emergency broadcasting is greatly improved.
7. Before emergency broadcasting is carried out on the file video, whether the file video is the high-definition video is verified, if so, only one file video is played for the high-definition video at a time, and the situation that a decoder decodes a plurality of high-definition videos simultaneously to cause decoding failure is avoided.
8. The emergency broadcasting of each data to be broadcasted is monitored through mutually independent monitoring threads, so that the data to be broadcasted of different data types can be simultaneously subjected to emergency broadcasting, and the flexibility of the emergency broadcasting is greatly improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (6)
1. An emergency broadcasting method for a multimedia IP outdoor terminal is characterized by comprising the following steps: the method comprises the following steps:
step S10, the outdoor terminal acquires multimedia data through an IP communication protocol, wherein the data type of the multimedia data is pictures, file videos or live videos;
step S20, the outdoor terminal checks the multimedia data;
step S30, the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expansion data;
step S40, the outdoor terminal stores the data to be broadcasted and the expansion data to a designated file path based on the data type, or directly performs emergency broadcasting;
step S50, the outdoor terminal reads the data to be broadcasted and the extension data from the file path, and emergency broadcasting is carried out on the data to be broadcasted through the extension data;
step S60, the outdoor terminal monitors emergency broadcasting of each piece of data to be broadcasted, and uploads a broadcasting record obtained by monitoring to the server;
the step S10 specifically includes:
step S11, after the outdoor terminal is started, sending heartbeat data to a server through an IP communication protocol;
step S12, the server feeds back response data allowing connection to the outdoor terminal based on the received heartbeat data;
step S13, the outdoor terminal establishes heartbeat connection with a server based on the received response data;
step S14, the server performs CRC calculation on each piece of data to be broadcasted to obtain a first check code, packages and compresses each piece of data to be broadcasted and the first check code based on an auxiliary data format to obtain multimedia data, and generates a URL address associated with the multimedia data;
step S15, the server sends an opening instruction carrying the URL address to the outdoor terminal;
s16, the outdoor terminal analyzes the received opening instruction to obtain a URL address, and downloads multimedia data through the URL address, wherein the data type of the multimedia data is pictures, file videos or live videos;
in the step S14, the content of the auxiliary data format includes an auxiliary data amount, a data type, an auxiliary data length, an auxiliary data content and extension data;
the auxiliary data number value is 1; the data type is pictures, file videos or live videos; the picture is a PNG picture, a JPEG picture or a GIF picture; the auxiliary data content is data to be broadcasted; the extension data comprises broadcasting task information, multimedia information and transitional effect information;
the broadcasting task information at least comprises the total number of files, the total number of transitional effects, the display sequence, tail frame processing identification, task types, starting time, ending time, cycle times and the number of simultaneous broadcasting; the tail frame processing identifier is used for identifying whether the last frame of picture is reserved or not; the task type is timing broadcast or cyclic broadcast;
the multimedia information at least comprises a multimedia ID, a check code, a multimedia width and height, a display duration, a display position, a filter effect and a coding format;
the transition effect information at least comprises a transition effect ID, a switching interval time, a switching mode, a display starting time and a display ending time; the switching mode at least comprises translation, scaling, rotation and blurring;
the step S40 specifically includes:
step S41, the outdoor terminal judges the data type of the multimedia data, and if the multimedia data is a live video, the step S42 is entered; if the video is a picture or a file video, the step S43 is entered;
step S42, the outdoor terminal directly decodes the data to be broadcasted through ffmpeg software and performs emergency broadcasting based on the expansion data;
step S43, the outdoor terminal performs information abstract calculation on the data to be broadcasted to obtain an MD5 value, judges whether a designated file path has a file with the same name as the MD5 value, and if so, ends the flow; if not, go to step S44;
step S44, the outdoor terminal judges whether the residual storage space of the designated file path can meet the storage requirement, if so, the step S45 is entered; if not, circularly judging and deleting the related files which are not related to the broadcasting task information until the storage requirement is met, and entering step S45;
step S45, the outdoor terminal renames the data to be broadcasted through an MD5 value and stores the renamed data into a designated file path, writes broadcasting task information, multimedia information and transitional effect information in the extended data into a data table respectively, adds the MD5 value into each data table as an index, and stores each data table into the designated file path.
2. The multimedia IP outdoor terminal emergency broadcasting method of claim 1, wherein: the step S20 specifically includes:
step S21, the outdoor terminal decompresses the multimedia data based on the auxiliary data format to obtain auxiliary data quantity, auxiliary data type, auxiliary data length, auxiliary data content and extension data;
step S22, the outdoor terminal acquires data to be broadcasted from the auxiliary data content, performs CRC calculation on the acquired data to be broadcasted to obtain a second check code, judges whether the second check code is equal to a first check code carried in the extension data, if so, passes the check, and enters step S30; if not, the verification fails, and the step S23 is carried out;
step S23, judging whether the number of times of verification failure exceeds a set number of times threshold, if so, sending response data of the failure in downloading to a server, and ending the flow; if not, the process proceeds to step S10.
3. The multimedia IP outdoor terminal emergency broadcasting method of claim 1, wherein: the step S30 specifically includes:
and the outdoor terminal analyzes the verified multimedia data to obtain data to be broadcasted and expanded data comprising broadcasting task information, multimedia information and transitional effect information.
4. The multimedia IP outdoor terminal emergency broadcasting method of claim 1, wherein: in the step S50, when the data type of the data to be broadcast is a picture, the method specifically includes the following steps:
step S511, the outdoor terminal reads the data to be broadcasted and the corresponding expansion data with the data type of pictures from the file path and then performs clock synchronization with the Internet;
step S512, the outdoor terminal judges whether the current time is the starting time carried by the extended data, if yes, the step S513 is carried out; if not, waiting for the current time to reach the starting time and proceeding to step S513;
step S513, the outdoor terminal loads the data to be broadcasted into a memory, and plays the data in sequence according to the display sequence carried by the extended data; in the playing process, based on the filter effect and the transitional effect information carried by the extension data, loading the filters of the data to be broadcasted and the transitional animation when the data to be broadcasted are switched through a libjpeg library;
step S514, the outdoor terminal judges whether the current playing times meet the cycle times carried by the expansion data, if yes, the step S515 is carried out; if not, go to step S513;
step 515, the outdoor terminal reserves or clears the last frame of picture played based on the tail frame processing identifier carried by the extended data.
5. The multimedia IP outdoor terminal emergency broadcasting method of claim 1, wherein: in the step S50, when the data type of the data to be broadcast is a file video, the method specifically includes the following steps:
step S521, the outdoor terminal reads the data to be broadcasted and the corresponding expansion data with the data type of the file video from the file path and then performs clock synchronization with the Internet;
step S522, the outdoor terminal judges whether the current time is the starting time carried by the extended data, if yes, the step S523 is entered; if not, waiting for the current time to reach the starting time, and proceeding to step S523;
step S523, the outdoor terminal judges whether the resolution of the data to be broadcast is smaller than 1080P, if yes, the data to be broadcast is a non-high definition video, all file videos of the data to be broadcast are loaded into a memory, playing is carried out based on the number of simultaneous playing carried by the expansion data, and step S524 is carried out; if not, the data to be broadcasted is a high-definition video, one of the file videos of the data to be broadcasted is loaded into a memory for playing, and step S524 is entered;
step S524, the outdoor terminal judges whether the current playing times meet the cycle times carried by the expansion data, if yes, the step S525 is carried out; if not, go to step S523;
and step S525, the outdoor terminal reserves or clears the last frame of picture to be played based on the tail frame processing identifier carried by the extension data.
6. The multimedia IP outdoor terminal emergency broadcasting method of claim 1, wherein: the step S60 specifically includes:
the outdoor terminal monitors the emergency broadcasting of the data to be broadcasted through mutually independent monitoring threads respectively, and uploads the broadcasting records obtained through monitoring to the server.
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