KR102094707B1 - audio data processing apparatus by use of virtual channels and virtual drivers - Google Patents

Abstract

The present invention relates to a technology for processing audio data based on a software in a computer device (e.g. personal computer and digital music equipment), and more particularly, to a technology for enabling a computer device to handle high-quality audio content by directly transmitting an audio data output of a specific driver to an audio data input of another driver in a digital manner via a direct buffer in the computer device. Audio data input/output setting between drivers can be performed by direct buffer control in accordance with software setting without passing through an external cable. In particular, an audio data processing form of an audio application program can be flexibly set without limitation of a hardware specification by augmenting a virtual channel and a virtual driver related to an audio driver. Accordingly, a plurality of audio application programs are executed in a general computer device to be freely combined so as to process audio data, thereby generating high-quality audio content at low costs.

Description

Audio data processing apparatus using virtual channels and virtual drivers {audio data processing apparatus by use of virtual channels and virtual drivers}

The present invention relates to a technology for processing audio data based on software in a computer device (eg, personal computer, digital music equipment).

More specifically, the present invention allows the computer device to handle high-quality audio content by digitally directing the audio data output of a specific driver to the audio data input of another driver via a direct buffer inside the computer device. It's about technology. The audio data input / output setting between the drivers is made through direct buffer control according to software settings without going through an external cable.

In particular, the present invention makes it possible to flexibly set an audio data processing form of an audio application without being limited by hardware specifications by augmenting a virtual channel and a virtual driver in relation to the audio driver. Through this, it is possible to execute a plurality of audio applications in a typical computer device and freely combine them to process audio data, thereby generating high-quality audio content at a low price.

Conventionally, a physical cable is connected between an electronic musical instrument that complies with MIDI (musical instrument digital interface) and a computer having a MIDI interface so that they can exchange data with each other, and through this, computer software can control the electronic musical instrument. there was. In addition, after the synthesizer and the MIDI interface were connected, the computer was able to edit the audio contents beyond the simple function of storing and playing the MIDI signal, and the computer became a necessary component for recording or producing music.

However, the personal computer (PC) 's operating system (OS) did not support an efficient way to control multiple audio inputs and outputs. It was also difficult to expand related new functions. For example, even if any hardware development company has developed audio hardware with excellent functions, there is a problem in that a computer cannot properly utilize the functions of the audio hardware. This is because the operating system installed in the PC does not have a software module to properly utilize the newly developed audio hardware.

To solve these problems, hardware companies developed their own driver to support their excellent features. Software vendors and hardware vendors have established their own standards.

In the end, since each software vendor supports only different standard specifications, hardware vendors must create and support multiple drivers to make the software work. In addition, it is impossible in principle to exchange audio data between audio applications, and for this, equipment supporting multiple audio applications had to be connected through a connection cable outside the computer, which increased the size and investment cost of the equipment. There was a problem inevitably to perform a very cumbersome operation.

1 is a block diagram showing the internal functional configuration of an audio data processing apparatus according to the prior art.

Referring to FIG. 1, the audio data processing apparatus according to the prior art receives various audio application programs 110 and audio data output from the audio application program 110, and various audio according to a user. User-level driver unit 120, which is a program for recording or reproducing data, kernel-level driver unit 130 that directly processes audio data without going through a CPU of a computer device, and analog data to digital data or vice versa. Sound card 140 in operation, an analog input channel 151 for receiving various analog signals and providing them to the sound card 140, and an analog output channel 152 for outputting analog data output from the sound card 140 It consisted of.

However, such a conventional configuration has an inconvenient problem in that an audio processing system is additionally provided at a high cost to exchange audio data or an external cable is separately connected. In addition, in this method, audio data output from the driver undergoes digital-to-analog conversion and analog-to-digital conversion through the sound card 140. In this process, loss or change of audio data occurs, resulting in sound quality degradation. There was.

In addition, in the conventional configuration, the processing form of audio data is limited by the hardware specifications of the sound card 140 and the analog input / output channels 151 and 152. Even if various types of audio applications (13 to 19) are executed on the computer device, the audio data connection processing (eg, mixing) between them is possible only in the form permitted by the hardware specifications of the computer device, and other types are implemented. To do this, you had to purchase additional audio processing equipment and connect it externally. This was a problem that required not only considerable inconvenience but also enormous cost investment.

An object of the present invention is to provide a technology for processing audio data in a computer device based on software.

Particularly, an object of the present invention is a technology that enables a computer device to handle high-quality audio content by digitally transmitting audio data output of a specific driver as an audio data input of another driver via a direct buffer inside the computer device. Is to provide The audio data input / output setting between the drivers is made through direct buffer control according to software settings without going through an external cable.

In particular, it is an object of the present invention to provide a technology that enables flexible setting of an audio application processing form of an audio application without being limited by hardware specifications by augmenting a virtual channel and a virtual driver in connection with the audio driver. Through this, it is possible to execute a plurality of audio applications in a typical computer device and freely combine them to process audio data, thereby generating high-quality audio content at a low price.

In order to achieve the above object, the present invention is a sound card 140 having a plurality of audio application programs 110 and one or more A / D converters 141 and D / A converters 142 for audio data. , Processes audio data in conjunction with an analog input channel 151 that receives an analog signal from the outside and provides it to the sound card 140 and an analog output channel 152 that outputs analog data output from the sound card 140. The user-level driver unit 120 includes a plurality of driver programs that individually receive or record audio data output from the plurality of audio application programs 110, and the plurality of driver programs receive audio data. A plurality of first drivers (121, 122, 123) and audio data processed through the Windows audio engine (124) and the Windows audio engine (124) Is composed of a plurality of ASIO programs 125 that are processed as separate channels, and the plurality of ASIO programs 125 are augmented with software to support the functions of the audio application 110, and the virtual channels are configured. It includes one or more ASIO programs 125 to configure, and a plurality of driver programs includes first drivers 121, 122, 123 and ASIO programs (121) to process audio data output from the plurality of audio application programs 110. A user-level driver unit 120 configured to augment the package of 125) in a multilayer to configure a virtual driver; A plurality of first drivers 121, 122, 123 and a plurality of direct buffers 210 respectively corresponding to the plurality of ASIO programs 125 are provided, and the plurality of first drivers 121, 122, 123 and ASIO programs ( 125) as a direct control unit 200 that receives audio data individually and processes output and input path flow of audio data by copying data between a plurality of direct buffers 210, in accordance with a user-selected input through a software menu A direct control unit 200 configured to switch the data copy path between the direct buffers 210 and to process a single layer by integrating a plurality of driver programs implemented in a multilayer virtual driver; A kernel-level driver unit 130 having a plurality of DMA channels 131 and receiving audio data from one or more direct buffers 210 under the control of the direct control unit 200 to directly process the CPU without going through the CPU of the computer device; It is configured to include.

In this case, the kernel-level driver unit 130 may be configured to virtually augment the DMA channel corresponding to the virtual channel of the user-level driver unit 120.

In addition, the direct control unit 200 may be configured to monitor buffer data values of a plurality of direct buffers 210 corresponding to a plurality of ASIO programs 125 to generate monitoring data for a virtual channel and display the output data.

Also, the first drivers 121, 122, and 123 may include one or more of the MME program 121, the WDM program 122, and the DirectSound program 123.

According to the present invention, digital audio data can be directly connected between drivers through direct buffer control according to software settings without the need to connect an analog input / output port through an external cable, so data of each application can be easily exchanged without losing sound quality and data. There is an advantage in that high-quality audio content can be generated in a computer device.

In particular, according to the present invention, it is possible to flexibly set the audio data processing form without being limited by hardware specifications by augmenting a virtual channel and a virtual driver in connection with the audio driver, thereby eliminating the need to purchase multiple audio processing systems. There is an advantage in that high-quality audio content can be flexibly generated in any shape desired by a user by executing multiple audio applications on one computer device and controlling direct buffer.

This reduces the cost burden for producing high-quality audio content, providing a foundation for many people, such as single broadcast creators, to show their creativity to the fullest without worrying about the cost of content creation. There is an advantage that can contribute to.

1 is a block diagram showing the internal functional configuration of an audio data processing apparatus according to the prior art.
2 is a block diagram showing the internal functional configuration of an audio data processing apparatus according to the present invention.
3 is a diagram showing an example of a software menu screen for setting an operating environment of an audio data processing apparatus in the present invention.
4 is a diagram showing an example of a software menu screen for setting an internal connection of an audio data processing apparatus in the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

2 is a block diagram showing an internal functional configuration of an audio data processing apparatus according to the present invention.

Referring to FIG. 2, the audio data processing apparatus of the present invention includes a plurality of audio application programs 110 and one or more A / D converters 141 and D / A converters 142 for audio data. Sound card 140, an analog input channel 151 that receives an analog signal from the outside and provides it to the sound card 140, and an analog output channel 152 that outputs analog data output from the sound card 140. As an apparatus for processing audio data in cooperation, it includes a user level driver unit 120, a direct control unit 200, and a kernel level driver unit 130.

First, the user-level driver unit 120 is configured to include a plurality of driver programs that individually receive or record audio data output from the plurality of audio application programs 110 to record or reproduce.

Such a plurality of driver programs process a plurality of first drivers 121, 122, and 123 that process audio data through the Windows audio engine 124 and audio data through a separate channel from the Windows audio engine 124. It comprises a plurality of ASIO program 125. Examples of the first drivers 121, 122, and 123 include the MME program 121, the WDM program 122, and the DirectSound program 123, and various other programs are possible.

At this time, the ASIO program 125 includes one or more ASIO programs 125 that are configured with software and constitute virtual channels to support the functions of the audio application program 110. Through this virtual channel, the number of channels supported by the audio data processing apparatus according to the present invention can be arbitrarily set without being limited by hardware specifications. On the other hand, in this specification, the augment (augment) was used to mean that it was built up through software processing.

In addition, the packages of the first drivers 121, 122, and 123 and the ASIO program 125 may be conceptually modeled as one layer. In the present invention, the virtual drivers are configured by augmenting these packages in multiple layers. can do. Among the audio application programs 110 using the ASIO program 125, there are those that occupy the entire ASIO program 125 of the audio driver. Therefore, even if there is an audio application program 110 having such characteristics, the first drivers 121, 122, 123 and the ASIO program (in order to process the audio data output from the plurality of audio application programs 110 without any problems) The virtual driver is configured by augmenting the package of 125) into a multi-layer. If there is an audio application program 110 that occupies the entirety of the ASIO program 125 in one layer, the other application program 110 may utilize an ASIO program (eg, 126) in another layer. In order to make it easier to grasp the technical content, different numbering was assigned to ASIO programs belonging to different layers. In addition, dotted lines are used for data paths using ASIO programs (126 to 128) belonging to the lower layer rather than the uppermost layer.

On the other hand, in FIG. 2, for conceptual separation, an audio application program 110 using the first drivers 121, 122, and 123 is displayed as a first audio application group 111, and the ASIO program 125 The audio application program 110 that utilizes is marked as the second audio application group 112.

The direct control unit 200 includes a plurality of first drivers 121, 122, and 123, and a plurality of direct buffers 210 respectively corresponding to the plurality of ASIO programs 125. The plurality of direct buffers 210 individually receive audio data from a plurality of first drivers 121, 122, and 123 and the ASIO program 125 and temporarily store them. Through data copying between the direct buffers 210, The audio data output and input path flow are processed internally. At this time, since the data copy path between the direct buffers 210 is switched according to a user selection input through a software menu, flexible audio data processing is possible.

At this time, [Figure 3] is a diagram showing an example of a software menu screen for setting the operating environment of the audio data processing apparatus in the present invention, [Figure 4] is setting the internal connection of the audio data processing apparatus in the present invention This is a diagram showing an example of a software menu screen. In [FIG. 3] and [FIG. 4], the physical channel consists of 2 input channels and 2 output channels, and the virtual channel consists of 6 channels. On such a user menu, a user can define audio data associations between a plurality of audio applications 110 through, for example, a mouse operation, and direct buffers to implement output and input path flows of corresponding audio data. Data is copied between the fields 210.

Referring to FIG. 3, an audio signal monitoring display is provided for inputs and outputs of six virtual channels. To this end, the direct control unit 200 monitors buffer data values of a plurality of direct buffers 210 corresponding to a plurality of ASIO programs 125 to generate monitoring data for audio data input and output to each virtual channel. do.

In addition, the direct control unit 200 processes a single layer by integrating a plurality of driver programs implemented in a multilayer virtual driver. Since data is copied between the direct buffers 210, it is more preferable in terms of buffer management to process it as a single layer. Modeling in the same multi-layer configuration for one-to-one matching with the user-level driver unit 120 is not excluded, but even in this case, there is practically no difference from processing as a single layer.

The kernel-level driver unit 130 is provided with a plurality of DMA channels 131 to receive audio data from one or more direct buffers 210 under the control of the direct control unit 200 to directly process it without going through the CPU of the computer device. It is a component. At this time, it is preferable that the kernel level driver unit 130 virtually sets the DMA channel corresponding to the virtual channel of the user level driver unit 120.

Meanwhile, some terms used in the present specification will be described.

MME (Multimedia Extensions, Multimedia Engine, 121) is a program that enables simultaneous recording and playback of audio and video.

WDM (Windows Driver Model, 122) is a driver specification made with the intention of being usable in Microsoft's Windows environment, and has unified the method of writing device drivers in the Windows environment. 1 and 2, WDM 122 is a driver program written according to these standards.

ASIO (Audio Stream Input / Output, 125 to 128) is a computer sound card driver protocol for digital audio that provides a low-latency and high-resolution interface between software and sound cards embodied by Steinberg, Germany. Microsoft's DirectSound is generally used for stereo input and output for the average user, while ASIO enables musicians and sound engineers to process audio through Windows computer software instead of external hardware.

The advantages of virtually extending the audio channel in one audio driver in the present invention will be described.

The audio data processing solutions of the prior art generally have the same or fewer audio channels and audio hardware inputs and outputs on the audio driver and DirectWiRE Router & Mixer. Creating a virtual channel regardless of the number of physical inputs and outputs of the audio hardware results in a virtual increase in the processing channel of the audio data, and through this, the audio application audio signal is sent to another virtual channel regardless of the basic input / output channel on the audio driver. It is possible to route to input and output for audio applications. Through this, it is possible to simultaneously utilize the advantages of a plurality of applications that process audio data.

Next, the advantage of virtually extending the audio driver to one audio hardware in the present invention will be described.

Since the WDM driver 122 provides a multi-client function, multiple applications can simultaneously occupy a single WDM driver, so that a wide variety of real-time audio operations can be performed by simply using the aforementioned virtual channel. However, since the data processing performance of the WDM driver 122 is poor, in the actual field, audio experts do not use the WDM driver. Most music applications (ASIO Host or DAW) used by audio experts operate based on the ASIO program 125, because the ASIO program 125 has superior real-time audio transmission and audio data processing performance compared to other driver programs. to be.

However, the ASIO program 125 generally does not support multi-clients, and even if some multi-clients are supported, if the multi-client operates, the driver performance is greatly reduced. Accordingly, it is common knowledge that one ASIO program 125 does not set a plurality of applications in the audio processing field, and accordingly, there are many audio application programs 110 dedicated to the ASIO program 125.

Accordingly, in the present invention, the ASIO audio driver is virtually stretched and set in one audio hardware. Through this, several professional audio applications 110 are executed at the same time, and audio data is connected between them, thereby attempting to completely change the audio music work of experts. In other words, it is possible to utilize the advantages of each professional audio application at the same time, thereby significantly upgrading the creative environment of audio content.

For the first example, when broadcasting personally as a virtual channel, audio effects such as background music, personal comments, and audio are assigned to different channels, processed in real-time by direct wires, mixed and transmitted, and with the level metering function in direct wires. The audio level of each channel can be monitored individually.

As a second example, two professional digital audio workstation (DAW) applications and VST host applications can be used as virtual drivers. For example, the famous free DAW application called StudioOne Prime provides infinite audio tracks, but it does not provide VST Host function that supports virtual effects or virtual instruments called VST. The famous free DAW application called Tracktion provides infinite audio tracks and supports virtual effects or virtual instruments called VST, but the audio mixer environment is inadequate, so users give up using it. A free application called Live Professor provides the proper VST Host function and mixer function, but these VST Hosts have the disadvantage of not having an audio recording and playback function. According to the present invention, by setting each DAW application and VST Host application with two virtual ASIO programs, audio signals of both applications can be configured to be input and output in real time.

On the other hand, the present invention can be implemented in the form of computer-readable code on a computer-readable non-volatile recording medium. There are various types of storage devices such as hard disks, SSDs, CD-ROMs, NAS, magnetic tapes, web disks, cloud disks, etc., and codes are distributed and stored in multiple networked storage devices. It can also be implemented as a form of execution. In addition, the present invention may be implemented in the form of a computer program stored in a medium in order to execute a specific procedure in combination with hardware.

100: audio data processing device
110, 111, 112: audio application
120: user level driver unit
121: MME program
122: WDM program
123: DirectSound program
124: Windows audio engine
125: ASIO program
129: GSIF program
130: kernel level driver unit
131: DMA channel
140: sound card
141: A / D converter (ADC)
142: D / A converter (DAC)
151: analog input channel
152: analog output channel
200: direct control
210: direct buffer (DBF)

Claims (4)

Sound card 140 including a plurality of audio application programs 110, one or more A / D converters 141 and D / A converters 142 for audio data, and an analog signal input from the outside to receive the sound A device for processing audio data in conjunction with an analog input channel (151) provided as a card (140) and an analog output channel (152) outputting analog data output from the sound card (140),
A user-level driver unit 120 having a plurality of driver programs that individually receive or output audio data output from the plurality of audio application programs 110, and the plurality of driver programs window the audio data. It includes a plurality of first drivers (121, 122, 123) for processing via the audio engine 124 and a plurality of ASIO programs 125 for processing the audio data in a separate channel from the Windows audio engine (124) Configured, the plurality of ASIO programs 125 includes one or more ASIO programs 125 configured to configure a virtual channel by augmenting with software to support the functions of the audio application program 110, and The plurality of driver programs connect and process audio data output from the plurality of audio application programs 110. To the first driver (121, 122, 123) and user-level driver 120 to the augment to the package of the ASIO program 125, a multi-layered configuration a virtual driver;
The plurality of first drivers 121, 122, and 123 and a plurality of direct buffers 210 corresponding to the plurality of ASIO programs 125 are provided, respectively, and the plurality of first drivers 121, 122, 123, and As a direct control unit 200 that receives audio data individually from the ASIO program 125 and processes the output and input path flow of the audio data through data copying between the plurality of direct buffers 210, through a software menu A direct control unit 200 configured to switch a data copy path between the plurality of direct buffers 210 according to a user selection input and to process the plurality of driver programs implemented in the multi-layer virtual driver into a single layer;
Kernel-level driver unit 130 provided with a plurality of DMA channels 131 and receiving audio data from one or more direct buffers 210 under the control of the direct control unit 200 to directly process it without going through a CPU of a computer device ;
Audio data processing apparatus using a virtual channel and a virtual driver configured to include.
The method according to claim 1,
The kernel-level driver unit 130 is configured to virtually augment the DMA channel corresponding to the virtual channel of the user-level driver unit 120, the audio data processing apparatus using a virtual channel and a virtual driver.
The method according to claim 2,
The direct control unit 200 monitors buffer data values of the plurality of direct buffers 210 corresponding to the plurality of ASIO programs 125, generates monitoring data for the virtual channel, and displays the output data. Audio data processing device using virtual channel and virtual driver.
The method according to claim 3,
The first driver (121, 122, 123) comprises an MME program 121, WDM program 122, DirectSound program (123) comprises one or more of the virtual channel and audio data using the virtual driver Processing unit.

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