CN112929114A - Low-delay audio distribution method, module and device based on network card - Google Patents
Low-delay audio distribution method, module and device based on network card Download PDFInfo
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- H—ELECTRICITY
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- H04H20/65—Arrangements characterised by transmission systems for broadcast
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Abstract
The invention discloses a low-delay audio distribution method, a module and a device based on a network card, wherein the method comprises the following steps: s1: acquiring a distribution audio instruction sent by a main control module, and requesting audio data from the main control module; s2: acquiring audio data sent by a main control module, and storing the audio data into a cache memory; s3: acquiring timing information of a timer, and sending audio data to target equipment at regular time; s4: and judging whether the buffer amount in the buffer memory is lower than a preset value, if so, executing S1, and if not, executing S3. According to the invention, through the accurate timing of the timer, the device can accurately send the audio data to the target equipment in real time, and the effect of stable playing is brought to the system audio distribution.
Description
Technical Field
The invention relates to the technical field of audio data distribution, in particular to a low-delay audio distribution method, a low-delay audio distribution module and a low-delay audio distribution device based on a network card.
Background
With the development of the broadcasting industry, the area and the scale of broadcast management are getting larger, many broadcast projects begin to use network digital audio broadcasting to replace the traditional analog audio broadcasting, and the scale of broadcast playing equipment can reach hundreds. However, since general network broadcasting equipment is limited by computer performance, the number of audio distribution paths does not meet the requirement, and it is difficult to ensure the real-time performance of audio distribution, which causes the audio to be intermittent during the playing process, and even affects the stability of the whole broadcasting system.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a low-latency audio distribution method based on a network card, which can solve the problem that the real-time performance of audio distribution cannot be guaranteed, so that the audio is interrupted during the playing process, and even the stability of the whole broadcasting system is affected.
The second objective of the present invention is to provide a low-latency audio distribution module based on a network card, which can solve the problem that the real-time performance of audio distribution cannot be guaranteed, which causes the audio to be intermittent during the playing process, and even affects the stability of the whole broadcasting system.
The invention also aims to provide a low-delay audio distribution device based on a network card, which can solve the problem that the real-time performance of audio distribution cannot be guaranteed, so that the audio is intermittent in the playing process, and even the stability of the whole broadcasting system is influenced.
In order to achieve one of the above purposes, the technical scheme adopted by the invention is as follows:
a low-delay audio distribution method based on a network card comprises the following steps:
s1: acquiring a distribution audio instruction sent by a main control module, and requesting audio data from the main control module;
s2: acquiring audio data sent by a main control module, and storing the audio data into a cache memory;
s3: acquiring timing information of a timer, and sending audio data to target equipment at regular time;
s4: and judging whether the buffer amount in the buffer memory is lower than a preset value, if so, executing S1, and if not, executing S3.
Preferably, the step S1 is preceded by the steps of:
s01: acquiring an audio channel opening instruction sent by a main control module through a broadcast network so as to enable a specified audio channel to be in an open state;
s02: and acquiring a target device instruction sent by the main control module, and configuring an audio channel to perform data interaction with the target device.
Preferably, the following steps are further included between S2 and S3:
s21: acquiring a forwarding instruction of a main control module;
s22: and acquiring the audio data sent by the second equipment, and storing the audio data into the cache storage.
Preferably, the step S3 is specifically implemented by the following steps:
and acquiring timing information of a corresponding timer according to the sampling rate of the audio data, and sending the audio data to the target equipment at regular time.
In order to achieve the second purpose, the technical scheme adopted by the invention is as follows:
a low-delay audio distribution module based on a network card comprises a storage and a processor;
a memory for storing program instructions;
and the processor is used for running the program instructions to execute the network card-based low-delay audio distribution method.
In order to achieve the third purpose, the technical scheme adopted by the invention is as follows:
a low-delay audio distribution device based on a network card comprises a main control module used for being externally connected with a computer and the low-delay audio distribution module based on the network card, wherein the main control module is connected with the low-delay audio distribution module based on the network card through a network.
Preferably, the system further comprises an audio distributor for distributing the audio data to the target device, an audio data transceiver for connecting the main control module, and a timer, wherein the audio data transceiver, the timer, and the audio distributor are connected with the network card-based low-delay audio distribution module.
Preferably, the timer is an audio clock crystal oscillator.
Preferably, the system further comprises a repeater for forwarding the audio data sent by the second device, and the repeater is connected with the network card-based low-latency audio distribution module.
Preferably, the system further comprises a buffer memory for buffering the audio data, and the buffer memory is connected with the network card-based low-latency audio distribution module.
Compared with the prior art, the invention has the beneficial effects that: the audio data are distributed to the target equipment at regular time through the timing information of the timer, so that the distribution has high real-time performance and accuracy, and the broadcast can play audio stably. Meanwhile, whether the buffer amount in the buffer memory is lower than a preset value or not is judged to determine whether the audio data needs to be actively requested to the main control module or not, so that the problem that the audio data is discontinuous and the audio playing is blocked due to the fact that the real-time performance of the main control module is not enough is avoided.
Drawings
Fig. 1 is a flowchart of a low latency audio distribution method based on a network card according to the present invention.
Fig. 2 is a circuit diagram of the main control module according to the present invention.
Fig. 3 is a circuit diagram of the network card-based low-latency audio distribution module according to the present invention.
Fig. 4 is an enlarged schematic view of the area a in fig. 3.
Fig. 5 is an enlarged schematic view of a region B in fig. 3.
Fig. 6 is a schematic structural diagram of the network card-based low-latency audio distribution device according to the present invention.
Fig. 7 is a schematic view of an actual application of the low-latency audio distribution apparatus based on the network card according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention will be further described with reference to the accompanying drawings and the detailed description below:
as shown in fig. 1-7, in the present invention, the main control module may be a single chip microcomputer or other integrated circuit chips, in this embodiment, the main control module employs a model of ARM-linux xrk 3399 single chip microcomputer, the network card-based low-latency audio distribution module may be a gigabit network card or a PCI/PCIE interface network card with a model of real-RTL 8211E-VB-CG, which distributes 128 independent audio at most and audio to 200 playback devices at most, the timer is a high-precision audio clock crystal oscillator, which is used as a clock source of the network card-based low-latency audio distribution module to provide precise timing, so that the audio jitter and clock skew of the system are very low, and the audio playback stability of the system is improved, in this embodiment, the network card-based low-latency audio distribution module uses a CDC-ECM mode in a USB protocol, the low-delay audio distribution module based on the network card can be used as the network card or an audio distribution device, the target device is a playing device, such as a speaker, and the second device is a playing device (such as a speaker) or an audio acquisition device (such as a microphone).
The first embodiment is as follows:
as shown in fig. 1, a low-latency audio distribution method based on a network card includes the following steps:
s01: acquiring an audio channel opening instruction sent by a main control module through a broadcast network so as to enable a specified audio channel to be in an open state;
specifically, the main control module issues a broadcast network control instruction packet to a designated port in an application program, configures a network card-based low-delay audio distribution module (hereinafter referred to as an audio distribution module for short), and then sends a data packet through a broadcast network, the audio distribution module intercepts the data packet through hardware and then separates network data and configuration data to reduce the difficulty of the main control module in configuring the audio distribution module, meanwhile, audio forwarding and distribution are directly processed by bottom hardware, the network data is processed by a computer, the system runs more efficiently and independently, and the designated audio channel is driven to be in an open state by using an audio channel opening instruction in configuration data.
S02: and acquiring a target device instruction sent by the main control module, and configuring an audio channel to perform data interaction with the target device.
Specifically, the audio distribution module acquires target equipment for receiving audio data from a data packet sent by the main control module, and then establishes connection between the specified audio channel in the open state and the target equipment to perform data interaction, namely, the distribution of the audio data is directly performed in the audio distribution module without the participation of the main control module (computer application layer), so that the distribution process is simplified, the distribution performance of the audio distribution module can be effectively improved, and the audio distribution module is suitable for being applied to a multi-task audio stream environment in a complex broadcast system.
S1: acquiring a distribution audio instruction sent by a main control module, and requesting audio data from the main control module;
specifically, after the audio distribution module establishes connection with the target device, the main control module sends an audio distribution instruction to the audio distribution module, so that the audio distribution module starts to actively request audio data from the main control module.
S2: acquiring audio data sent by a main control module, and storing the audio data into a cache memory;
specifically, after the audio distribution module acquires the audio data sent by the main control module, the acquired audio data is stored in the cache memory, so that the audio distribution module acquires the audio data in advance, and the problem that the audio data is discontinuous and the sound is blocked due to insufficient real-time performance of the main control module when the audio data is distributed is avoided.
Preferably, the audio distribution module is further capable of intercepting and storing audio data sent by the second device, and specifically, the following steps are further included between S2 and S3:
s21: acquiring a forwarding instruction of a main control module;
specifically, the audio distribution module obtains the forwarding instruction of the main control module, and starts a function of forwarding the audio data sent by the second device to the target device, that is, the audio data is distributed or forwarded without the participation of the main control module (computer application layer), the audio data sent by the second device is not sent to the main control module, and is directly sent inside the audio distribution module, so that the distribution or forwarding process is simplified, the processing pressure of the main control module (computer) is reduced, and the influence of audio jitter caused by the non-real-time performance of the main control module (computer) is reduced.
S22: and acquiring the audio data sent by the second equipment, and storing the audio data into the cache storage.
Specifically, after the audio distribution module acquires the audio data sent by the second device, the acquired audio data is stored in the cache memory, so that the audio distribution module acquires the audio data in advance, and the problem of sound blockage caused by discontinuous audio data due to insufficient real-time performance of the second device when forwarding is avoided.
S3: acquiring timing information of a timer, and sending audio data to target equipment at regular time;
specifically, the timer is an audio clock crystal oscillator with high precision, and the audio clock crystal oscillator is used as an accurate timer, so that the audio distribution module has high real-time performance and can distribute audio data to the target device on time, in this embodiment, the S3 is specifically implemented by the following steps: the audio distribution module acquires the sampling rate of each audio data, and acquires the timing information of the corresponding timer according to the sampling rate of the audio data so as to send the audio data to the target device at regular time, thereby realizing stable playing of the audio.
S4: and judging whether the buffer amount in the buffer memory is lower than a preset value, if so, executing S1, and if not, executing S3.
Specifically, whether the buffer amount in the buffer memory is lower than a preset value or not is actively judged by the audio distribution module, so as to determine whether the audio distribution module needs to actively request audio data from the main control module or not, and avoid the problem of sound blockage caused by discontinuous audio data due to insufficient real-time performance of the main control module; preferably, when the audio data with forwarding still exists in the cache storage, the audio data is continuously forwarded to the target device.
Example two:
as shown in fig. 3-5, a network card based low-latency audio distribution module includes a storage and a processor;
a memory for storing program instructions;
and the processor is used for operating the program instructions to execute and implement the network card-based low-latency audio distribution method.
Example three:
as shown in fig. 2 to 7, a low-latency audio distribution device based on a network card includes a main control module for externally connecting a computer and the low-latency audio distribution module based on the network card according to the second embodiment, where the main control module is connected to the low-latency audio distribution module based on the network card through a network.
Specifically, the system further comprises an audio distributor used for distributing the audio data to the target device, an audio data transceiver used for connecting the main control module, and a timer, wherein the audio data transceiver, the timer, and the audio distributor are connected with the network card-based low-delay audio distribution module. In this embodiment, the audio distribution module obtains a control instruction from the main control module through the audio data transceiver, establishes a connection with the target device, and sequentially distributes the audio data sent by the main control module to the target device according to time information of the timer, in this embodiment, the main control module and the audio data transceiver are connected through a USB interface, the audio distribution module intercepts a data packet sent by the main control module through the audio data transceiver, then separates network data and configuration data to reduce the configuration difficulty of the main control module for the audio distribution module, and uses an audio channel opening instruction in the configuration data to drive a specified audio channel of the audio distributor to be in an open state, and then establishes a connection between the specified audio channel in the open state and the target device to perform data interaction, that is, the distribution of the audio data does not need the participation of the main control module (computer application layer), the method is directly carried out in an audio distribution module (audio distributor), simplifies the distribution process, can effectively improve the distribution performance of the audio distribution module, and is suitable for being applied to a multi-task audio stream environment in a complex broadcasting system.
Preferably, the timer is an audio clock crystal oscillator to realize accurate timing, so that the distribution operation has higher accuracy and real-time performance, and a stable playing effect is brought to the system audio distribution. In this embodiment, the audio distribution module obtains the sampling rate of each audio data, and then obtains the timing information of the corresponding timer according to the sampling rate of the audio data, so as to send the audio data to the target device at regular time, thereby realizing stable playing of the audio
Preferably, the system further comprises a repeater for forwarding the audio data sent by the second device, and the repeater is connected with the network card-based low-latency audio distribution module. In this embodiment, the audio distribution module obtains the forwarding instruction of the main control module, and starts a function of forwarding the audio data sent by the second device to the target device, that is, the audio data is distributed or forwarded without participation of the main control module (computer application layer), the audio data sent by the second device is not sent to the main control module, and is directly performed inside the audio distribution module (audio distributor), so that the distribution or forwarding flow is simplified, the processing pressure of the main control module (computer) is reduced, and the influence of audio jitter caused by non-real-time performance of the main control module (computer) is reduced.
Preferably, the system further comprises a buffer memory for buffering the audio data, and the buffer memory is connected with the network card-based low-latency audio distribution module. In this embodiment, after the audio distribution module obtains the audio data sent by the main control module or forwarded by the second device, the obtained audio data is stored in the cache memory, so that the audio distribution module obtains the audio data in advance, and the problem of sound blockage caused by discontinuous audio data due to insufficient real-time performance of the device when distributing is avoided.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. A low-delay audio distribution method based on a network card is characterized by comprising the following steps:
s1: acquiring a distribution audio instruction sent by a main control module, and requesting audio data from the main control module;
s2: acquiring audio data sent by a main control module, and storing the audio data into a cache memory;
s3: acquiring timing information of a timer, and sending audio data to target equipment at regular time;
s4: and judging whether the buffer amount in the buffer memory is lower than a preset value, if so, executing S1, and if not, executing S3.
2. The network card-based low-latency audio distribution method according to claim 1, wherein the S1 is preceded by the steps of:
s01: acquiring an audio channel opening instruction sent by a main control module through a broadcast network so as to enable a specified audio channel to be in an open state;
s02: and acquiring a target device instruction sent by the main control module, and configuring an audio channel to perform data interaction with the target device.
3. The network card-based low-latency audio distribution method according to claim 1, further comprising the following steps between S2 and S3:
s21: acquiring a forwarding instruction of a main control module;
s22: and acquiring the audio data sent by the second equipment, and storing the audio data into the cache storage.
4. The network card-based low-latency audio distribution method according to claim 1, wherein the S3 is specifically implemented by the following steps:
and acquiring timing information of a corresponding timer according to the sampling rate of the audio data, and sending the audio data to the target equipment at regular time.
5. The utility model provides a low latency audio frequency distribution module based on network card which characterized in that: comprises a storage and a processor;
a memory for storing program instructions;
a processor for executing the program instructions to perform the network card based low latency audio distribution method of any one of claims 1-4.
6. The utility model provides a low latency audio distribution device based on network card which characterized in that: the network card-based low-latency audio distribution module comprises a main control module used for externally connecting a computer and the network card-based low-latency audio distribution module of claim 5, wherein the main control module is connected with the network card-based low-latency audio distribution module through a network.
7. The network card-based low-latency audio distribution device of claim 6, wherein: the system also comprises an audio distributor used for distributing the audio data to the target equipment, an audio data transceiver used for connecting the main control module and a timer, wherein the audio data transceiver, the timer and the audio distributor are connected with a low-delay audio distribution module based on a network card.
8. The network card-based low-latency audio distribution device of claim 7, wherein: the timer is an audio clock crystal oscillator.
9. The network card-based low-latency audio distribution device of claim 7, wherein: the repeater is used for forwarding the audio data sent by the second equipment and is connected with the low-delay audio distribution module based on the network card.
10. The network card-based low-latency audio distribution device of claim 7, wherein: the audio data processing device further comprises a cache memory used for caching the audio data, and the cache memory is connected with the low-delay audio distribution module based on the network card.
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| CN202110104716.6A CN112929114B (en) | 2021-01-26 | 2021-01-26 | Low-delay audio distribution method, module and device based on network card |
| PCT/CN2021/104539 WO2022160608A1 (en) | 2021-01-26 | 2021-07-05 | Low-delay audio distribution method, module and apparatus based on network card |
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| WO2022160608A1 (en) * | 2021-01-26 | 2022-08-04 | 广州市保伦电子有限公司 | Low-delay audio distribution method, module and apparatus based on network card |
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