19.2.2 Mixer

Bigloo proposes various functions and classes for controlling the audio volume of sound cards.

Bigloo Multimedia class: mixer

(class mixer
   (devices::pair-nil (default '())))

The field devices is a list of available channels.

Bigloo Multimedia procedure: mixer-close mix

Closes a mixer. The argument mix must be an instance of the mixer class.

Bigloo Multimedia procedure: mixer-volume-get mix channel

Bigloo Multimedia procedure: mixer-volume-set! mix channel leftv rightv

The function mixer-volume-get returns the left and right volume levels (two values) of the channel of the mixer mix. The channel is denoted by its name and is represented as a string of characters. The argument mix is an instance of the mixer class.

The function mixer-volume-set! changes the audio level of a mixer channel.

Bigloo Multimedia class: soundcard::mixer

(class soundcard::mixer
   (device::bstring read-only))

The instances of the class soundcard, a subclass of the mixer class, are used to access physical soundcard as supported by operating systems. The class field device stands for the name of the system device (e.g., "/dev/mixer" for the Linux OS). During the initialization of the instance, the device is opened and initialized.

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