Audio Capture Filter Specification

The audio capture filter can only be used as the first filter of an input graph. It reads audio data from the specified MultiMedia device.

JavaScript

{
	"name": "Audio Capture",
	"device": {
		"name": "..."
	},
	"format": {
		"sampleRate": "...",
		"resolution": "...",
		"numberOfChannels": "..."
	}
}

Field	Description
device	Defines the physical device. name: Name of the device as shown in Windows' list of recording devices. It is sufficient to specify only a part of this string in the name field, as long as it is unique to the device. The name can also be empty - in this case, the default recording device is used.
format	Describes the audio format, which is to be read from the device. sampleRate: Sampling rate in Hz. The supported values depend on the device. Most devices support at least 44100 and 48000 Hz. resolution: Bit width of a single audio sample. The supported values depend on the device. Most devices support 16 and 24 bit audio. numberOfChannels: This must be either 1 (for a mono recording) or 2 (for a stereo recording). The field is optional, with a default value of 2.

Field

Description

device

Defines the physical device.

name: Name of the device as shown in Windows' list of recording devices. It is sufficient to specify only a part of this string in the name field, as long as it is unique to the device. The name can also be empty - in this case, the default recording device is used.

format

Describes the audio format, which is to be read from the device.

sampleRate: Sampling rate in Hz. The supported values depend on the device. Most devices support at least 44100 and 48000 Hz.
resolution: Bit width of a single audio sample. The supported values depend on the device. Most devices support 16 and 24 bit audio.
numberOfChannels: This must be either 1 (for a mono recording) or 2 (for a stereo recording). The field is optional, with a default value of 2.