CN109981590A - A kind of stream medium audio and video synchronous broadcast method based on B/S framework - Google Patents
A kind of stream medium audio and video synchronous broadcast method based on B/S framework Download PDFInfo
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- CN109981590A CN109981590A CN201910149424.7A CN201910149424A CN109981590A CN 109981590 A CN109981590 A CN 109981590A CN 201910149424 A CN201910149424 A CN 201910149424A CN 109981590 A CN109981590 A CN 109981590A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- 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
- H04N21/6437—Real-time Transport Protocol [RTP]
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
A kind of stream medium audio and video synchronous broadcast method based on B/S framework, comprising the following steps: A, in transmitting terminal is each introduced into the call number of corresponding audio pack on the head of the RTP data packet of every frame video frame；B, the audio-video packet received is cached in buffer area by client from received server-side streamed audio, video bag, and is ranked up and framing；C, when the first call number synchronizes processing to when corresponding to；D, the video frame and audio pack of the subsequent deposit buffer area of above step decoded output are repeated, until playing terminates.The present invention is simple to operation, expense is small, it is not need to rely on timestamp, also the case where packet loss, is handled, and utilize L2 cache, play the role of good smooth transition, while reducing processing, playout-delay, effectively eliminates in real-time audio and video monitoring system since audio-video is asynchronous and bring " labial is inconsistent " phenomenon.
Description
Technical field
The present invention relates to Streaming Media fields, more particularly to the sound based on B/S framework in real-time audio and video monitoring system
Audio video synchronization playback method.
Background technique
Since the new century, Chinese safety monitoring industry achieves considerable progress.Smart city, wisdom cell it is fast
Run-up is set, and all new generation audiovisual digital compress technique is emerged in large numbers, and is all greatly promoted flourishing for safety monitoring market.
Network monitoring system is widely applied in every field, either the weight such as mechanism, public security organs or airport, railway, bank
Point unit, more and more high-quality safe protection engineerings are badly in need of document-video in-pace monitoring system clear, true to nature, and Voice Surveillance field is
New highlight as security industry.After network monitoring system is added in audio, the synchronization of audio-video at monitoring system crucial class
Topic.
In the technology that existing stream medium audio and video is played simultaneously, it is played simultaneously with an IP network stream medium audio and video
For technology, terminal (end Web) just constantly receives the media data packet for carrying out automatic network after starting streaming media playing.This
When process flow it is as follows:
(1) medium type is judged by RTP Playload (RTP load) first, learn its be which kind of format audio or
Video media；
(2) according to medium type, media data and its pts (time tag) are sent to the caching of the audio or video in memory
Area；
(3) a. is after video data reaches certain amount in video cache area, opening timing device, according to video data
Pts is sent to Video Decoder processing, and exports video；
B. after audio data reaches certain amount in audio buffer district, opening timing device, according to the pts of audio data,
Audio data in audio buffer district is decoded, and the PCM data of decoded output is sent to audio chip/sound card processing, and export
Audio.
Due to the complicated factor of IP network transmission data, above-mentioned streaming media playing process, audio-visual synchronization precision is inaccurate,
Random error is big, and synchronous effect is poor, is affected by abnormal conditions, therefore, can generate and bring since audio-video is asynchronous
" labial is inconsistent " phenomenon.
In summary, in actual use, there is inconvenient and defect in existing stream medium audio and video simultaneous techniques, must so having
It is improved.
Summary of the invention
In order to eliminate in real-time audio and video monitoring system due to audio-video is asynchronous and bring " labial is inconsistent " is existing
As effectively eliminating and being regarded in real-time sound the present invention provides a kind of method that the stream medium audio and video based on B/S framework is played simultaneously
Since audio-video is asynchronous and bring " labial is inconsistent " phenomenon in frequency monitoring system.
To achieve the goals above, the present invention provides the following technical solution:
A kind of stream medium audio and video synchronous broadcast method based on B/S framework, the described method comprises the following steps:
A, in transmitting terminal, the call number of corresponding audio pack is each introduced on the head of the RTP data packet of every frame video frame；
B, the audio-video packet received is cached to caching from received server-side streamed audio, video bag by client
Qu Zhong, and be ranked up and framing；
C, when the first call number is as follows to treatment process when corresponding to:
C1, the first video frame find corresponding first audio pack according to call number, and Video Decoder decodes the first video frame
And display is exported, audio decoder decodes the first audio pack and exports decoded audio data to audio hardware at the same time
It plays out；
C2, while the first video frame and audio pack decoded output, the second video frame looks for its correspondence according to call number
Audio pack, audio/video decoder distinguishes corresponding with its audio pack of decoding video frame, but does not export, that is, waits call back function to return
Broadcasting is exported again after returning verification value；
C3, after the completion of the first video frame and audio pack export, return to a call back function, decoded second video frame
It is played immediately with audio pack；
D, the video frame and audio pack of the subsequent deposit buffer area of above step decoded output are repeated, until playing terminates.
Further, in the step A, extended bit position is set in the packet header video frame RTP, it is made to fix packet header (12 byte)
For the extension of access head to record video frame to the call number of audio frame, this call number is the sequence number of respective synchronization audio pack afterwards.
Further, in the step A, a video frame is divided to be transmitted by multiple RTP packets, then this multiple RTP packet includes
Identical call number.
In the step B, process is as follows:
B1, the first buffer area of setting, establish audio data chained list and video data chained list respectively in the buffer area；
B2, judge that data packet is packets of audio data or video data packet according to PT Payload Type (PT value), if it is
Packets of audio data is just stored in above-mentioned audio data chained list, and above-mentioned video data chained list is just stored in if it is video data packet
In；
B3, by the data packet of classified in respective data link table according to the serial number and timestamp value in the packet header RTP
It is ranked up；
B4, the second buffer area of setting, are put into the buffer area for the video frame for having organized frame, audio pack is then directly placed into.
In the B4, video frame is carried out in the second buffer area according to call number and looks for corresponding audio pack and completion pair
The decoding process of video frame and audio pack.
Include in the step C2, if the second video frame does not look for corresponding sound in above-mentioned second buffer area
Frequency wraps, then abandons the second video frame；If not exported immediately after the completion of being successfully found and decoding, until receiving call back function
Export broadcasting again afterwards.
In the step C3, call back function specifically, return true immediately when the first video frame and audio pack finish playing
Recognize value, then the second video frame and audio pack play immediately.
The invention has the benefit that the call number in the present invention is directly to be subject to by the expansion structure in the packet header RTP
It realizes, simple to operation, expense is small, is not need to rely on timestamp, is also handled the case where packet loss, and utilize
L2 cache plays the role of good smooth transition, in addition to this, while one group of audio and video playing one under parallel processing
The pairing of group audio-video and decoding effort, reduce processing, playout-delay, effectively eliminate and monitor system in real-time audio and video
Since audio-video is asynchronous and bring " labial is inconsistent " phenomenon in system.
Detailed description of the invention
Fig. 1 is stream medium audio and video synchronous broadcast method flow chart provided by the invention；
Fig. 2 is RTP package head format figure provided by the invention；
Fig. 3 is the index relative figure between RTP audio pack and video bag provided by the invention；
Fig. 4 is the structural schematic diagram of the first buffer area provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig.1, a kind of stream medium audio and video synchronous broadcast method based on B/S framework, for controlling files in stream media
Audio-visual synchronization when the end Web plays, method includes the following steps:
A, the RTP package head format figure referring to provided by Fig. 2, it is known that preceding 12 byte in the packet header video RTP is all according to video
The case where frame, is set, and extended bit position X is arranged in we, so that RTP provides extension mechanism, in fixed packet header (12 byte)
Affix other additional effective informations relevant to payload afterwards.
It therefore, can be in head (fixed 12 word of packet header of the RTP data packet of every frame video frame in transmitting terminal (individual soldier's equipment)
After section) it is each introduced into the call number of corresponding audio pack, this call number is the sequence number of respective synchronization audio pack, in addition, ginseng
According to the index relative figure between RTP audio pack and video bag provided by Fig. 3 it is found that a video frame is often divided by multiple
The transmission of RTP packet, then this multiple RTP packet includes identical call number；
B, client (end Web) caches the audio-video packet received from received server-side streamed audio, video bag
Into buffer area, and it is ranked up and framing, the process are further specifically:
No matter B1, the first buffer area of setting, establish audio data chained list and video data chained list respectively in the buffer area
That audio or video data chained list are all made of node unit one by one, the size of each node unit by data packet size
It determines；
B2, judge that data packet is packets of audio data or video data packet according to PT Payload Type (PT value), if it is
Packets of audio data is just stored in above-mentioned audio data chained list, and above-mentioned video data chained list is just stored in if it is video data packet
In, that is, be deposited into node；
B3, simultaneously by the data packet of classified in respective data link table according in the packet header RTP serial number and the time
Timestamp value is ranked up, the specific order buffer process according to the structural schematic diagram for the first buffer area that Fig. 4 is provided are as follows:
(1) cache node is divided into the node BusyDatanode in idle node FreeDatanode and use；
(2) new data packet is received, just to one FreeDatanode of memory application, the media that will be loaded in RTP packet
FreeDatanode is written in data, while the information such as sequence number, timestamp being transmitted to the corresponding positions of FreeDatanode, and root
Data carrying FreeDatanode is inserted into the correct position of buffer area according to sequence number, to restore media data in buffer area
Original time relationship, then FreeDatanode has reformed into a BusyDatanode；
(3) after the data in BusyDatanode node, which are admitted to decoder, to be played out, BusyDatanode will
Revert to a FreeDatanode；
(4) when FreeDatanode node use is over i.e. buffer overflow, oldest BusyDatanode section
Data in point will be deleted, and itself is then converted to a FreeDatanode.
B4, the second buffer area of setting, are put into the buffer area for the video frame for having organized frame, audio pack is then directly placed into.
C, when the first call number is as follows to treatment process when corresponding to:
C1, the first video frame find corresponding first audio pack according to call number in the second buffer area, to video frame into
Row is decoded simultaneously to export to video player and be played, and also decodes the first audio pack in the buffer area at the same time and will be decoded
Audio data is exported to audio hardware and is played out；
C2, while the first video frame and audio pack decoded output, the second video frame looks for its correspondence according to call number
Audio pack then abandon second if not looking for audio pack corresponding with the second video frame in above-mentioned second buffer area
Video frame；If being successfully found then decoding video frame and audio pack immediately, but do not export immediately, after receiving call back function again
Output plays；
C3, after the first video frame and audio pack finish playing, return to a call back function, i.e. the first sound, video playing
Complete, then decoded second video frame and audio pack play immediately, may receive can play instruction when the second video frame and
Audio pack does not decode completion also, can be to play in decoding；
D, the video frame and audio pack of the subsequent deposit buffer area of above step decoded output are repeated, until playing terminates.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Any modifications, equivalent replacements, and improvements etc. done within mind, principle, should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of stream medium audio and video synchronous broadcast method based on B/S framework, which is characterized in that the method includes following steps
It is rapid:
A, in transmitting terminal, the call number of corresponding audio pack is each introduced on the head of the RTP data packet of every frame video frame；
B, the audio-video packet received is cached in buffer area by client from received server-side streamed audio, video bag,
And it is ranked up and framing；
C, when the first call number is as follows to treatment process when corresponding to:
C1, the first video frame find corresponding first audio pack according to call number, and Video Decoder the first video frame of decoding is simultaneously defeated
It shows out, audio decoder decodes the first audio pack and exports decoded audio data to audio hardware and carries out at the same time
It plays；
C2, while the first video frame and audio pack decoded output, the second video frame looks for its corresponding sound according to call number
Frequency wraps, and audio/video decoder distinguishes decoding video frame audio pack corresponding with its, but does not export, i.e., waiting call back function returns true
Recognize and exports broadcasting after value again；
C3, after the completion of the first video frame and audio pack export, return to a call back function, decoded second video frame and sound
Frequency packet plays immediately；
D, the video frame and audio pack of the subsequent deposit buffer area of above step decoded output are repeated, until playing terminates.
2. the stream medium audio and video synchronous broadcast method according to claim 1 based on B/S framework, which is characterized in that institute
It states in step A, extended bit position is set in the packet header video frame RTP, so that it is fixed packet header and be followed by extending into head to record video frame
To the call number of audio frame, this call number is the sequence number of respective synchronization audio pack.
3. the stream medium audio and video synchronous broadcast method according to claim 1 or 2 based on B/S framework, which is characterized in that
In the step A, a video frame is divided to be transmitted by multiple RTP packets, then this multiple RTP packet includes identical call number.
4. the stream medium audio and video synchronous broadcast method according to claim 1 or 2 based on B/S framework, which is characterized in that
In the step B, process is as follows:
B1, the first buffer area of setting, establish audio data chained list and video data chained list respectively in the buffer area；
B2, judge that data packet is packets of audio data or video data packet according to PT Payload Type, if it is packets of audio data
With regard to being stored in above-mentioned audio data chained list, just it is stored in if it is video data packet in above-mentioned video data chained list；
B3, by the data packet of classified in respective data link table according in the packet header RTP serial number and timestamp value carry out
Sequence；
B4, the second buffer area of setting, are put into the buffer area for the video frame for having organized frame, audio pack is then directly placed into.
5. the stream medium audio and video synchronous broadcast method according to claim 4 based on B/S framework, which is characterized in that institute
It states in B4, video frame is carried out in the second buffer area, corresponding audio pack is looked for according to call number and is completed to video frame and sound
The decoding process of frequency packet.
6. the stream medium audio and video synchronous broadcast method according to claim 4 based on B/S framework, which is characterized in that institute
It states in step C2 and includes, if the second video frame does not look for corresponding audio pack in above-mentioned second buffer area, then lose
Abandon the second video frame；If not exported immediately after the completion of being successfully found and decoding, exports and broadcast again after receiving call back function
It puts.
7. the stream medium audio and video synchronous broadcast method according to claim 1 or 2 based on B/S framework, which is characterized in that
In the step C3, call back function is to return to verification value immediately when the first video frame and audio pack finish playing, then the second view
Frequency frame and audio pack play immediately.
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| WO2024093570A1 (en) * | 2022-10-31 | 2024-05-10 | 华为技术有限公司 | Screen projection method and apparatus |
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Application publication date: 20190705 |