CN115167806A - A kind of network audio broadcast gradient audio processing method and server - Google Patents

Abstract

The invention discloses a network audio broadcast gradual change audio processing method and a server, wherein the method comprises the following steps: driving the system host to configure the audio information of the singlechip processing unit through the USB and distributing the audio information; s2: and driving the network playing terminal to judge whether gradual change is needed according to the voice gradual change mark, if not, taking the volume of the audio stream as the playing volume, if so, executing S3: judging whether the current playing volume meets the condition, if so, playing the audio, and if not, calling a volume ratio table to obtain a value B; s4: by the formula: and S = A × B/65536, obtaining the adjusted playing volume, storing the adjusted playing volume as the current playing volume, and returning to execute S3. In the invention, the system host drives the singlechip processing unit to process the audio information through the USB, the control complexity of the system host is reduced, an application layer is not required to participate in volume control, a volume proportion table is used for carrying out floating point number removing operation on data, integer operation is used, and the operation efficiency of a computer is greatly improved.

Description

A kind of network audio broadcast gradient audio processing method and server

technical field

The invention relates to the technical field of audio transmission, and in particular, to a method and a server for processing gradient audio of network audio broadcasting.

Background technique

In music playback, it is often necessary to use the volume fade-in and fade-out function to achieve a comfortable transition of music. That is, when it starts to play, the sound gradually rises from small to large. When the playback is turned off, the sound gradually decreases from loud to quiet. The traditional music playback is played by the local machine. When controlling the music playback, you can control the volume of the local machine to change gradually and gradually. In audio broadcasting applications, the audio source and playback source are often not a single device, but consist of a system host and multiple playback terminals. The system host is responsible for sending the audio stream to the playback terminal to play music, and the music fade-in effect is controlled by the host. .

The existing network audio broadcasting technology, which realizes the function of gradual and gradual out, is mainly that the system host sends commands to control the playback terminal through the network, and when the audio is played or stopped, sends a volume control command to control the network playback terminal. The sound gradually fades out. . The prior art mainly has the following problems: first, the volume control is separated from the audio stream, which may cause the volume change to be out of sync with the sound; second, the host control logic is complex, and when there are multiple playback terminals, it is necessary to send a message to the multiple playback terminals. Control commands are easily disturbed by network packet loss. Loss of control commands cannot control the gradual exit of the terminal.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide a network audio broadcast gradual change audio processing method, which can solve the problem that the volume change and the sound asynchrony and easy to suffer from in the network audio broadcast gradual change in the prior art are prone to occur. The problem of network packet loss interference and loss of control commands cannot control the gradual exit of the terminal.

The purpose of the present invention is to provide a network audio broadcast gradient audio processing server, which can solve the problem that the volume change and the sound are easily out of sync in the network audio broadcast gradient in the prior art, and are easily disturbed by network packet loss and loss of control instructions. Unable to control terminal fading out problem.

In order to achieve one of the above objects, the technical scheme adopted in the present invention is as follows:

A network audio broadcast gradient audio processing method, comprising the following steps:

S1: drive the system host to configure the audio information in the audio stream in the single-chip processing unit through USB, and distribute it to the network playback terminal through the network, wherein the audio information includes audio ID, audio stream volume, gradient mark and gradient duration field;

S2: drive the network playback terminal to judge whether the current audio stream needs to perform volume gradient according to the gradient mark in the audio data, if not, store the audio stream volume as the playback volume, and play the audio, and if so, execute S3;

S3: Determine whether the current playback volume meets the conditions. If so, play audio at the current playback volume and end the volume gradient. If not, call the volume scale table to obtain the B value corresponding to the current playback volume in the volume scale table, and execute S4;

S4: Obtain the adjusted playback volume through the formula: S=A*B/65536, store the adjusted playback volume as the current playback volume, and return to S3; where S is the adjusted playback volume, and A is the current playback volume .

Preferably, the S1 is specifically implemented by the following steps:

S11: Drive the system host to configure the audio information in the audio stream in the single-chip processing unit through USB;

S12: Drive the system host to transmit audio frames to the single-chip processing unit through USB, and combine the audio frames and audio information into UDP packets, which are distributed to the network playback terminal through the network.

Preferably, the S2 is specifically implemented by the following steps:

Drive the network playback terminal to unpack the UDP packet, extract the audio stream volume, gradient flag and gradient duration, and judge whether the current audio stream needs gradient according to the gradient flag in the audio data, if not, store the audio stream volume as the playback volume , play audio, if yes, execute S3.

Preferably, the S2 and S3 also include the following steps:

It is judged whether the gradient flag belongs to the gradient flag. If so, the gradient condition is stored as the current playback volume is equal to the audio stream volume. If not, the gradient condition is stored as the playback volume is 0.

Preferably, the S4 is specifically implemented by the following steps:

Obtain the adjusted playback volume through the formula: S=A*B/65536, store the adjusted playback volume as the current playback volume, wait for a gradient time, and return to execute S3; where S is the adjusted playback volume, and A is Current playback volume.

In order to achieve the second above-mentioned purpose, the technical scheme adopted in the present invention is as follows:

A network audio broadcast gradient audio processing server, comprising a storage and a processor;

a memory for storing program instructions;

The processor is configured to run the program instructions to execute the above-mentioned method for processing the gradient audio of the network audio broadcast.

Compared with the prior art, the present invention has the beneficial effects that the system host drives the single-chip processing unit to process the audio information through the USB, reduces the control complexity of the system host, does not require the application layer to participate in the volume control, and simultaneously controls the gradient mark of the volume change and the The gradient duration and the audio frame are synchronously combined and transmitted, and the volume scale table is used to de-float the data, and the integer operation is used to greatly improve the computing efficiency of the computer.

Description of drawings

FIG. 1 is a flow chart of the network audio broadcast gradient audio processing method described in the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Below, in conjunction with accompanying drawing and specific embodiment, the present invention is further described:

In the present invention, the system host includes an arm embedded platform, and the arm embedded platform is connected to the single-chip processing unit through a USB interface, wherein the arm embedded platform is responsible for processing application control, and the single-chip processing unit is responsible for real-time audio stream distribution, and users can use computer clients The terminal (APP, web page, etc.) logs in to the system host through the network to control the broadcasting system. Preferably, the single-chip processing unit is connected to the network playback terminal through a gigabit network.

Example 1:

As shown in Figure 1, a method for processing gradient audio of network audio broadcasting includes the following steps:

S1: drive the system host to configure the audio information in the audio stream in the single-chip processing unit through USB, and distribute it to the network playback terminal through the network, wherein the audio information includes audio ID, audio stream volume, gradient mark and gradient duration field;

Specifically, by combining the gradient flag and the audio frame, the network playback terminal can obtain the gradient standard and the audio frame at the same time, thereby reducing the delay. In this embodiment, the S1 is specifically implemented by the following steps:

S11: Drive the system host to configure the audio information in the audio stream in the single-chip processing unit through USB;

Specifically, the system host configures the audio information in the audio stream in the single-chip processing unit through USB, wherein the audio information includes audio ID, audio stream volume, gradient flag and gradient duration field, the audio ID is the audio stream identification number, and the audio stream ID is the audio stream identification number. The audio stream volume ranges from 0 to 100. The gradient flags include 0 for no gradient, 1 for gradient and 2 for gradient out. 1, 2 and 0 can be customized according to actual needs. In the embodiment, the frame header identifier, the audio stream ID, the audio stream volume, the gradient flag and the gradient duration are arranged in sequence to form the audio information.

S12: Drive the system host to transmit audio frames to the single-chip processing unit through USB, and combine the audio frames and audio information into UDP packets, which are distributed to the network playback terminal through the network.

Specifically, the system host transmits the audio frame to the single-chip processing unit through USB, and forms the audio frame and audio information into a UDP packet, wherein the UDP packet header, audio information, audio data length and audio data form a UDP packet. Further, before distribution , the single-chip processing unit will distribute the UDP packets distributed to different target IPs to form a three-layer network data packet, and distribute it to the network playback terminal through the network.

S2: drive the network playback terminal to judge whether the current audio stream needs to perform volume gradient according to the gradient mark in the audio data, if not, store the audio stream volume as the playback volume, and play the audio, and if so, execute S3;

Specifically, after obtaining the network data packet, the network playback terminal parses the network data packet to determine whether the current audio stream needs to be gradually changed. In this embodiment, the S2 is specifically implemented by the following steps:

Drive the network playback terminal to unpack the UDP packet, extract the audio stream volume, gradient flag and gradient duration, and judge whether the current audio stream needs gradient according to the gradient flag in the audio data, if not, store the audio stream volume as the playback volume , play audio, if yes, execute S3.

Specifically, when the gradient flag in the audio data is 0, it means that the current audio stream does not need to perform volume gradient, the volume of the audio stream is stored as the playback volume, and the audio is played. When the gradient flag is not 0, it is further determined whether the gradient flag belongs to the gradual change. If it is, the fade condition is stored as the current playback volume is equal to the audio stream volume, if not, the fade condition is stored as the playback volume is 0.

S3: Determine whether the current playback volume meets the conditions, if so, play the audio at the current playback volume, if not, call the volume scale table to obtain the B value corresponding to the current playback volume in the volume scale table, and execute S4;

Specifically, when the gradient flag is the progressive flag, it is judged whether the current playback volume is equal to the audio stream volume. If so, the audio is played at the current playback volume, and the volume gradient is ended. If not, the volume ratio table is called to obtain the volume ratio table. A B value corresponding to the current playback volume continues to perform volume gradation processing.

When the gradient flag is the fade-out flag, it is judged whether the current playback volume is equal to 0, then the audio is played at the current playback volume, and the volume gradient is ended. The corresponding B value continues to perform volume gradient processing.

Preferably, set the volume adjustment of each level to -0.2db, and obtain Vo/Vi=0.977 through the formula: 20lg(Vo/Vi)=0.2db, that is, the ratio of audio output to audio input when each level is attenuated by 0.2db is 0.977, where Vo is the audio output and Vi is the audio input, so that Vo/Vi=0.977^(100-X), according to Vo/Vi=0.977^(100-X), and Vi=65536 (because The system audio uses 16-bit data, so 65536 is used as the benchmark), and the Vo value corresponding to each level of volume is calculated to form a volume ratio table to achieve de-floating operation, and can calculate the digital audio after volume adjustment at high speed. The volume ratio table is as follows:

[0,6706,6862,7022,7185,7353,7524,7699,7879,8062,8250,

8442,8639,8840,9046,9257,9472,9693,9919,10150,10386,

10628,10876,11129,11388,11654,11925,12203,12487,12778,13076,

13380,13692,14011,14337,14671,15013,15363,15720,16087,16461,

16845, 17237, 17639, 18050, 18470, 18900, 19341, 19791, 20252, 20724,

21207, 21701, 22206, 22723, 23253, 23794, 24348, 24916, 25496, 26090,

26698,27319,27956,28607,29273,29955,30653,31367,32098,32845,

33610,34393,35194,36014,36853,37712,38590,39489,40409,41350,42313,43299,44307,45339,46395,47476,48582,49714,50872,52057,53269,54510,55780,57079,58409, 59769, 61161, 62586, 64044, 65536]

S4: Obtain the adjusted playback volume through the formula: S=A*B/65536, store the adjusted playback volume as the current playback volume, and return to S3; where S is the adjusted playback volume, and A is the current playback volume .

Specifically, through the formula: S=A*B/65536, the adjusted playback volume is obtained, the adjusted playback volume is stored as the current playback volume, and the playback is performed with the current playback volume for a gradual duration, and then returns to execute S3; wherein S is the adjusted playback volume, and A is the current playback volume.

In this embodiment, when the current playback volume is 100, the B value corresponding to 100 is 65536, so S=100, that is, when the current playback volume is 100, there is no attenuation. When the current playback volume is 50, S=50*B/65536=50*0.31, which is equivalent to 2/3 volume attenuation, and the attenuation rate is about -10.1db.

Embodiment 2:

A network audio broadcast gradient audio processing server, comprising a storage and a processor;

a memory for storing program instructions;

The processor is configured to run the program instructions to execute the method for processing gradient audio of network audio broadcasting according to the first embodiment.

For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (6)

1. a network audio broadcast gradient audio processing method, is characterized in that, comprises the following steps: S1: drive the system host to configure the audio information in the audio stream in the single-chip processing unit through USB, and distribute it to the network playback terminal through the network, wherein the audio information includes audio ID, audio stream volume, gradient mark and gradient duration field; S2: drive the network playback terminal to judge whether the current audio stream needs to perform volume gradient according to the gradient mark in the audio data, if not, store the audio stream volume as the playback volume, and play the audio, and if so, execute S3; S3: Determine whether the current playback volume meets the conditions. If so, play audio at the current playback volume and end the volume gradient. If not, call the volume scale table to obtain the B value corresponding to the current playback volume in the volume scale table, and execute S4; S4: Obtain the adjusted playback volume through the formula: S=A*B/65536, store the adjusted playback volume as the current playback volume, and return to S3; where S is the adjusted playback volume, and A is the current playback volume . 2. network audio broadcasting gradual change audio processing method as claimed in claim 1, is characterized in that, described S1 is specifically realized by following steps: S11: Drive the system host to configure the audio information in the audio stream in the single-chip processing unit through USB; S12: Drive the system host to transmit audio frames to the single-chip processing unit through USB, and combine the audio frames and audio information into UDP packets, which are distributed to the network playback terminal through the network. 3. network audio broadcast gradient audio processing method as claimed in claim 1, is characterized in that, described S2 is specifically realized by following steps: Drive the network playback terminal to unpack the UDP packet, extract the audio stream volume, gradient flag and gradient duration, and judge whether the current audio stream needs gradient according to the gradient flag in the audio data, if not, store the audio stream volume as the playback volume , play audio, if yes, execute S3. 4. network audio broadcasting gradual change audio processing method as claimed in claim 3, is characterized in that, described S2 and S3 also comprise the following steps: It is judged whether the gradient flag belongs to the gradient flag. If so, the gradient condition is stored as the current playback volume is equal to the audio stream volume. If not, the gradient condition is stored as the playback volume is 0. 5. network audio broadcast gradient audio processing method as claimed in claim 1, is characterized in that, described S4 is specifically realized by following steps: Obtain the adjusted playback volume through the formula: S=A*B/65536, store the adjusted playback volume as the current playback volume, wait for a gradient time, and return to execute S3; where S is the adjusted playback volume, and A is Current playback volume. 6. A network audio broadcast gradient audio processing server is characterized in that: comprise storage and processor; a memory for storing program instructions; The processor is configured to run the program instructions, so as to execute the network audio broadcast gradient audio processing method according to any one of claims 1-5.

Images