CN109743528A - A kind of audio collection of video conference and play optimization method, device and medium - Google Patents
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Abstract
The present invention discloses a kind of audio collection of video conference and plays optimization method, device and medium, is related to video conferencing technology field, including setting audio collection parameter and first call back function for being handled the audio digital signals of acquisition；When each sampled audio is converted into digital signal by analog quantity, the first call back function is called to handle audio digital signals；Audio play parameter and one are set for changing the second call back function of audio play buffer occupied state；When audio plays out, the second call back function is called to carry out judgement distribution to audio buffer；The present invention greatly reduces the occupancy of CPU with sleep () function in the case where not influencing the effect that audio plays in real time.
Description
Technical field
The present invention relates to video conferencing technology field more particularly to a kind of audio collection of video conference and play optimization side
Method, device and medium.
Background technique
The application range of video conferencing system is very extensive, can be applicable to the network teleconference, synergetic office work, online training
The various aspects such as instruction, tele-medicine, long-distance education, can be widely used in government, army, enterprise, IT, telecommunications, electric power, education,
The every field such as medical treatment, security, finance, manufacture.In video conference, most important mode of the audio as reception and registration conferencing information,
It is the information of highest priority, sound effect and fluency are all extremely important, therefore, real-time acquisition and the playing function of audio
Optimization just seems further important.
There are many methods that can carry out audio collection and play in cell phone system；In terms of audio collection, such as:
AVAudioRecorder, AVCaptureDevice, Audio Unit, Audio Queues.Audio plays aspect, such as:
AVAudioPlayer, AVPlayer, AudioQueue, OpenAL, Audio Unit.Their each have their own advantage and disadvantage, specifically
Are as follows:
AVAudioRecorder: although usage is fairly simple, streaming is not supported；This means that: playing audio
Before, it is necessary to after the completion of the load of entire audio, it could start to play audio；When recording, it is also necessary to after End of Tape,
Recording data can be got.This causes significant limitation to application.AVCaptureDevice: its usage is also simpler
Single, when supporting streaming, but it is that audio-video acquires together, therefore initialize video parameter, audio frequency parameter is also simultaneously
Be configured with, if it is desired to be separately configured it is more troublesome if audio collection parameter, and if audio is wanted to stop acquisition,
Video acquisition also and then stopped, and compares limitation, Audio Unit: being the interface of the bottom, support streaming, its advantages are function
Can be powerful, postpone low；And the disadvantage is that learning cost is high, difficulty is big.Audio Queues: streaming is supported, advantage can be by audio
Queue cooperates the interface of other Core Audio to use, along with the custom code of relatively small amount can be in the application
Solution, the height but its recording is delayed are recorded or played to the digital audio for creating complete set.
AVAudioPlayer: describing for it is high-efficient, substantially supports all audio formats, the control to broadcasting, such as
Loop play, sound size, pause etc. are more convenient.Disadvantage: can be some more to the consumption of memory.Do not support streaming, and can not
Play Online Music AVPlayer: it is similar with AVAudioPlayer, and different places is can to support streaming.
AudioQueue: it supports streaming, its advantages to be responsible for carrying out memory management to its buffer area using audio queue, optimizes money
The use in source.OpenAL: advantage: cross-platform solution can use under multiple platforms, support file and streaming broadcasting,
But if time delay is high in terms of being used in real-time voice.Audio Unit: streaming broadcasting, low delay, the bottom, but it
Broadcasting is played by a playbackCallback call back function, and the number called for this function one second is probably
20-30 times or so.If the size of the data flow of the backstage broadcasting per second transmitted and number is more will generate one
A little abnormal problems.
Summary of the invention
The present invention provides a kind of audio collection of video conference for the problem of background technique and plays optimization side
Method, device and medium solve echo and the high disadvantage of CPU usage.
To achieve the goals above, the present invention proposes a kind of audio collection of video conference and plays optimization method, including
Following steps:
The first readjustment of S10, setting audio collection parameter and one for being handled the audio digital signals of acquisition
Function；
S20, when each sampled audio is converted into digital signal by analog quantity, call the first call back function to digital audio
Signal is handled；
The the second readjustment letter of S30, setting audio play parameter and one for changing audio play buffer occupied state
Number；
S40, when audio plays out, call the second call back function judgement distribution is carried out to audio buffer.
Preferably, setting audio collection parameter described in step S10, comprising:
S101, the example for obtaining an AVAudioSession class, are arranged AudioSession audio categories；
S102, customized the first graph of structural body comprising AUGraph and AudioUnit, and create and be directed toward the knot
The 2nd graph of AUGraph in structure body；
S103, it adds in the graph of Node to the 2nd of a Remote I/O type；
S104, the underlying parameter that audio collection is set.
Preferably, first call back function, is arranged audio processing operation according to actual needs, including but not limited to:
Balanced, mixing and format conversion.
Preferably, the underlying parameter, including but not limited to: audio collection sample rate, the frame number of each data packet, language
The occupancy digit of sound sampled point, the bytes number of every frame, monophonic or multichannel are arranged, the bytes of each data packet is total, every
The bytes number of frame × each data packet frame number and echo cancellor setting.
Preferably, setting audio play parameter described in step S30, comprising:
S301, creation audio play object；
The underlying parameter that S302, setting audio play；
S303, setting internal thread play, and create output.
Preferably, the underlying parameter that the setting audio plays, including but not limited to: sample rate, data package size, language
The every sampled point of sound occupies digit.
Preferably, second call back function of calling carries out judgement distribution to audio buffer, comprising:
S304, the occupied state for judging multiple buffering area；
S305, it audio data is sent to unappropriated buffer area plays out.
Preferably, the audio data format is pcm data.
The present invention also proposes a kind of audio collection of video conference and plays optimization device, comprising:
Processor；
Memory is coupled to the processor and is stored with instruction, and the instruction is executing reality by the processor
The step of audio collection and broadcasting optimization method of the existing video conference.
The present invention also proposes that a kind of computer-readable storage medium, the computer-readable storage medium are stored with view
The audio collection of frequency meeting and the application program for playing optimization method, the application program realize the sound of video conference as mentioned
The step of frequency acquisition is with optimization method is played.
The present invention uses Audio Unit to carry out audio collection first, and Audio Queues carries out audio broadcasting, realizes sound
The function that frequency acquisition plays.But the requirement for video conference for audio is very high, and this scheme is there are two defects, and first
Reflective problem once in a while, second, discovery CPU is occupied very high when exactly playing audio；For the two defects present invention
Further optimized, propose a kind of audio collection of video conference and plays optimization method, device and medium, due to
Audio Unit can not complete independently echo cancellor work, need to cooperate AUGraph come using；AUGraph is manager,
Different Unit is added to as Node to be gone to play a role in AUGraph；Echo cancellor is carried out using AUGraph；For broadcasting
When playback frequency, the high problem of CPU usage is the discovery that the audio data frequency transmitted due to server-side is too fast caused, not
It influences to greatly reduce the occupancy of CPU with sleep () function under the effect that audio plays in real time.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the audio collection of video conference and broadcasting optimization method flow chart in first preferred embodiment of the invention；
Fig. 2 is S10 flow chart of steps in first preferred embodiment of the invention；
Fig. 3 is first preferred embodiment of the invention sound intermediate frequency collection process figure；
Fig. 4 is S30 flow chart of steps in first preferred embodiment of the invention；
Fig. 5 is the audio collection of video conference and broadcasting optimization apparatus structure signal in second preferred embodiment of the invention
Figure；
Fig. 6 is computer storage medium structure chart in third preferred embodiment of the invention；
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention proposes a kind of audio collection of video conference and plays optimization method；
In first preferred embodiment of the invention, as shown in Figure 1, including the following steps:
The first readjustment of S10, setting audio collection parameter and one for being handled the audio digital signals of acquisition
Function；
As shown in Figures 2 and 3, comprising:
S101, the example for obtaining an AVAudioSession class, setting AudioSession audio categories are
kAudioSessionCategory_PlayAndRecord；
S102, customized the first graph of structural body comprising AUGraph and AudioUnit, and create and be directed toward the knot
The 2nd graph of AUGraph in structure body；
S103, it adds in the graph of Node to the 2nd of a Remote I/O type；
In the embodiment of the present invention, the Node of a Remote I/O type is stated, and be added in the 2nd graph, finally
This graph is opened, Remote I/OUnit belongs to one of Audio Unit, is one relevant to hardware device
Unit, it is divided into input terminal and output end, such as loudspeaker, microphone and earphone；The present invention only needs to record, therefore to allow defeated
Entering to hold Intput and microphone to connect can；
S104, the underlying parameter that audio collection is set.
In the embodiment of the present invention, some audio frequency parameters of AudioUnitSetProperty () function setup, such as one are called
The sample rate of a little audio collections, each data packet how many frame, the occupancy digit of speech sample point, the bytes number of every frame, monophonic
Or multichannel, the bytes sum of each data packet, the frame number of each data packet of bytes number * of every frame, echo cancellor setting
Also it is arranged herein；
S20, when each sampled audio is converted into digital signal by analog quantity, call the first call back function to digital audio
Signal is handled；
In the embodiment of the present invention, CallBack function is set, when every secondary audio program comes in be converted into digital signal from microphone
This CallBack function will be called, digital signal is made into the processing that you want, audio can be done herein some balanced, mixed
The operations such as conjunction, format conversion, according to project demands, I is the pcm data directly taken；Call back function is the static state side of a C language
Then method associates it with AUGraph；
In the embodiment of the present invention, calls AUGraphInitialize () function to initialize graph, and then call
AUGraphStart () function opens graph；AudioOutputUnitStart () function is finally called to begin to acquisition audio
?；
The the second readjustment letter of S30, setting audio play parameter and one for changing audio play buffer occupied state
Number；
As shown in Figure 4, comprising:
S301, creation audio play object；
The underlying parameter that S302, setting audio play；
In the embodiment of the present invention, some basis instruments are carried out to audio stream；Such as sample rate, data package size, voice are every
Sampled point occupies digit etc.；
S303, setting internal thread play, and create output；
In the embodiment of the present invention, AudioQueueNewOutput () function is called, is played, is created defeated using internal thread
Out；
S304, the second call back function of calling judge the occupied state of multiple buffering area；
In the embodiment of the present invention, setting audio finishes playing call back function.This function is mainly used to following change buffering
Then area's occupied state initializes the buffer area of needs, be preferably provided with three buffer areas and facilitate management；Finally call
AudioQueueStart () function opens audio and plays queue；
S305, it audio data is sent to unappropriated buffer area plays out.
S40, when audio plays out, call the second call back function judgement distribution is carried out to audio buffer.
In the embodiment of the present invention, after taking audio data from the background, because data are pcm data thus, so not having to carry out
What decoding process, first judge before buffer area of throwing to three buffer areas which be it is unappropriated, then the data hand over
That unappropriated buffer area is given, in the case that CPU occupancy is excessively high when broadcasting for audio, is used cooperatively herein
Sleep () function substantially reduces CPU occupancy.Finally AudioQueueEnqueueBuffer () function is called to play out.
The present invention also proposes a kind of audio collection of video conference and plays optimization device；
In second preferred embodiment of the invention, as shown in Figure 5, comprising:
Processor；
Memory is coupled to the processor and is stored with instruction, and the instruction is executing reality by the processor
The step of audio collection and broadcasting optimization method of the existing video conference, such as:
The first readjustment of S10, setting audio collection parameter and one for being handled the audio digital signals of acquisition
Function；
S101, the example for obtaining an AVAudioSession class, setting AudioSession audio categories are
kAudioSessionCategory_PlayAndRecord；
S102, customized the first graph of structural body comprising AUGraph and AudioUnit, and create and be directed toward the knot
The 2nd graph of AUGraph in structure body；
S103, it adds in the graph of Node to the 2nd of a Remote I/O type；
S104, the underlying parameter that audio collection is set.
S20, when each sampled audio is converted into digital signal by analog quantity, call the first call back function to digital audio
Signal is handled；
The the second readjustment letter of S30, setting audio play parameter and one for changing audio play buffer occupied state
Number；
S301, creation audio play object；
The underlying parameter that S302, setting audio play；
In the embodiment of the present invention, some basis instruments are carried out to audio stream；Such as sample rate, data package size, voice are every
Sampled point occupies digit etc.；
S303, setting internal thread play, and create output；
S304, the second call back function of calling judge the occupied state of multiple buffering area；
S305, it audio data is sent to unappropriated buffer area plays out.
S40, when audio plays out, call the second call back function judgement distribution is carried out to audio buffer.
Particular technique details herein has elaborated in first preferred embodiment above, no longer repeats herein；
In the embodiment of the present invention, the audio collection of the video conference and optimization device internal processor is played, it can be with
It is made of, such as can be made of the integrated circuit of single package integrated circuit, is also possible to by multiple identical functions or not
Congenerous encapsulation integrated circuit formed, including one or more central processing unit, microprocessor, digital processing chip,
The combination etc. of graphics processor and various control chips.Processor takes all parts using various interfaces and connection, passes through
Operation executes the program being stored in memory or unit, and calls the data being stored in memory, to execute view
The audio collection of frequency meeting and the various functions and processing data for playing optimization.
Memory is mounted on the video conference of fusion emotion and semantic rules for storing program code and various data
Audio collection and the access for playing in optimization device, and realizing high speed in the process of running, being automatically completed program or data.Institute
Stating memory includes read-only memory, random access memory, programmable read only memory, Erasable Programmable Read Only Memory EPROM, one
Secondary programmable read only memory, electronics erasing type can make carbon copies read-only memory, CD-ROM or other disc memories, disk and deposit
Reservoir, magnetic tape storage or any other the computer-readable medium that can be used in carrying or storing data.
The present invention also proposes a kind of computer-readable storage medium；
In third preferred embodiment of the invention, as shown in fig. 6, the computer-readable storage medium is stored with video council
The audio collection of view and the application program for playing optimization method, the application program realize that the audio of video conference as mentioned is adopted
The step of collection is with optimization method is played, such as:
The first readjustment of S10, setting audio collection parameter and one for being handled the audio digital signals of acquisition
Function；
S101, the example for obtaining an AVAudioSession class, setting AudioSession audio categories are
kAudioSessionCategory_PlayAndRecord；
S102, customized the first graph of structural body comprising AUGraph and AudioUnit, and create and be directed toward the knot
The 2nd graph of AUGraph in structure body；
S103, it adds in the graph of Node to the 2nd of a Remote I/O type；
S104, the underlying parameter that audio collection is set.
S20, when each sampled audio is converted into digital signal by analog quantity, call the first call back function to digital audio
Signal is handled；
The the second readjustment letter of S30, setting audio play parameter and one for changing audio play buffer occupied state
Number；
S301, creation audio play object；
The underlying parameter that S302, setting audio play；
In the embodiment of the present invention, some basis instruments are carried out to audio stream；Such as sample rate, data package size, voice are every
Sampled point occupies digit etc.；
S303, setting internal thread play, and create output；
S304, the second call back function of calling judge the occupied state of multiple buffering area；
S305, it audio data is sent to unappropriated buffer area plays out.
S40, when audio plays out, call the second call back function judgement distribution is carried out to audio buffer.
Particular technique details herein has elaborated in first preferred embodiment above, no longer repeats herein；
In the description of embodiments of the present invention, it should be noted that in flow chart or described otherwise above herein
Any process or method description be construed as, indicate to include one or more for realizing specific logical function or mistake
Module, segment or the part of the code of the executable instruction of the step of journey, and the range packet of the preferred embodiment of the present invention
Include other realization, wherein sequence shown or discussed can not be pressed, including according to related function by it is basic simultaneously
Mode or in the opposite order, Lai Zhihang function, this should be managed by the embodiment of the present invention person of ordinary skill in the field
Solution.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processing module or other can be from instruction
Execute system, device or equipment instruction fetch and the system that executes instruction) use, or combine these instruction execution systems, device or
Equipment and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, store, communicating, propagating
Or transfer program uses for instruction execution system, device or equipment or in conjunction with these instruction execution systems, device or equipment
Device.The more specific example (non-exhaustive list) of computer-readable medium include the following: there are one or more wirings
Electrical connection section (electronic device), portable computer diskette box (magnetic device), random access memory, read-only memory is erasable
Except editable read-only memory, fiber device and portable optic disk read-only storage.In addition, computer-readable medium is very
To can be the paper that can print described program on it or other suitable media, because can be for example by paper or other Jie
Matter carries out optical scanner, is then edited, interprets or is handled when necessary with other suitable methods electronically to obtain
Described program is obtained, is then stored in computer storage.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of audio collection of video conference and broadcasting optimization method, which comprises the steps of:
S10, setting audio collection parameter and first call back function for being handled the audio digital signals of acquisition；
S20, when each sampled audio is converted into digital signal by analog quantity, call the first call back function to audio digital signals
It is handled；
S30, setting audio play parameter and one are for changing the second call back function of audio play buffer occupied state；
S40, when audio plays out, call the second call back function judgement distribution is carried out to audio buffer.
2. the audio collection of video conference according to claim 1 and broadcasting optimization method, which is characterized in that step S10
The setting audio collection parameter, comprising:
S101, the example for obtaining an AVAudioSession class, are arranged AudioSession audio categories；
S102, customized the first graph of structural body comprising AUGraph and AudioUnit, and create and be directed toward the structural body
The 2nd graph of middle AUGraph；
S103, it adds in the graph of Node to the 2nd of a Remote I/O type；
S104, the underlying parameter that audio collection is set.
3. the audio collection of video conference according to claim 1 and playing optimization method, which is characterized in that described the
Audio processing operation is arranged in one call back function according to actual needs, including but not limited to: balanced, mixing and format conversion.
4. the audio collection of video conference according to claim 2 and broadcasting optimization method, which is characterized in that the base
Plinth parameter, including but not limited to: audio collection sample rate, the frame number of each data packet, the occupancy digit of speech sample point, every frame
Bytes number, monophonic or multichannel setting, the bytes sum of each data packet, every frame bytes number × each data packet
Frame number and echo cancellor setting.
5. the audio collection of video conference according to claim 1 and broadcasting optimization method, which is characterized in that step S30
The setting audio play parameter, comprising:
S301, creation audio play object；
The underlying parameter that S302, setting audio play；
S303, setting internal thread play, and create output.
6. the audio collection of video conference according to claim 5 and broadcasting optimization method, which is characterized in that described sets
The underlying parameter of audio broadcasting is set, including but not limited to: the every sampled point of sample rate, data package size, voice occupies digit.
7. the audio collection of video conference according to claim 1 and broadcasting optimization method, which is characterized in that the tune
Judgement distribution is carried out to audio buffer with the second call back function, comprising:
S304, the occupied state for judging multiple buffering area；
S305, it audio data is sent to unappropriated buffer area plays out.
8. the audio collection of video conference according to claim 7 and broadcasting optimization method, which is characterized in that the sound
Frequency data format is pcm data.
9. a kind of audio collection of video conference and broadcasting optimization device characterized by comprising
Processor；
Memory is coupled to the processor and is stored with instruction, and the instruction is executing the power of realization by the processor
Benefit require any one of 1 to 8 described in video conference audio collection and play optimization method the step of.
10. a kind of computer-readable storage medium, which is characterized in that the computer-readable storage medium is stored with video
The audio collection of meeting and the application program for playing optimization method, the application program realize such as any one of claims 1 to 8
The step of audio collection and broadcasting optimization method of the video conference.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111314780A (en) * | 2020-03-27 | 2020-06-19 | 苏州科达科技股份有限公司 | Method and device for testing echo cancellation function and storage medium |
| CN111679805A (en) * | 2020-05-11 | 2020-09-18 | 深圳市有方科技股份有限公司 | Audio hardware parameter setting method and related equipment |
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Inventor after: Zhao Dingjin Inventor after: Zhu Zhenghui Inventor after: Zhang Changhua Inventor before: Zhao Dingjin Inventor before: Zhu Zhenghui Inventor before: Zhang Changhua Inventor before: Ming De |
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Application publication date: 20190510 |