Mixer

This example loads two mp3 audio files and mixes them together using the MixerNode. The two GainNode instances can be used to control the volume of the individual audio players.

Swift

import SwitchboardSDK

class MixerExample {
    
    let audioEngine = SBAudioEngine()
    let audioGraph = SBAudioGraph()
    let drumsPlayerNode = SBAudioPlayerNode()
    let drumsGainNode = SBGainNode()
    let bassPlayerNode = SBAudioPlayerNode()
    let bassGainNode = SBGainNode()
    let mixerNode = SBMixerNode()

    init() {
        drumsPlayerNode.loadFile("drums.mp3")
        bassPlayerNode.loadFile("bass.mp3")

        audioGraph.addNode(drumsPlayerNode)
        audioGraph.addNode(drumsGainNode)
        audioGraph.addNode(bassPlayerNode)
        audioGraph.addNode(bassGainNode)
        audioGraph.addNode(mixerNode)

        audioGraph.connect(drumsPlayerNode, to: drumsGainNode)
        audioGraph.connect(bassPlayerNode, to: bassGainNode)
        audioGraph.connect(drumsGainNode, to: mixerNode)
        audioGraph.connect(bassGainNode, to: mixerNode)
        audioGraph.connect(mixerNode, to: audioGraph.outputNode)
        
        audioEngine.start(audioGraph)
    }

    func play() {
        drumsPlayerNode.play()
        bassPlayerNode.play()
    }

    func pause() {
        drumsPlayerNode.pause()
        bassPlayerNode.pause()
    }

    func setDrumsVolume(_ newValue: Float) {
        drumsGainNode.setGain(newValue)
    }

    func setBassVolume(_ newValue: Float) {
        bassGainNode.setGain(newValue)
    }
}

Kotlin

import com.synervoz.switchboard.sdk.AudioEngine
import com.synervoz.switchboard.sdk.audiograph.AudioGraph
import com.synervoz.switchboard.sdk.audiographnodes.MixerNode

class MixerExample {
    
    val audioEngine = AudioEngine()
    val audioGraph = AudioGraph()
    val drumsPlayerNode = AudioPlayerNode()
    val drumsGainNode = GainNode()
    val bassPlayerNode = AudioPlayerNode()
    val bassGainNode = GainNode()
    val mixerNode = MixerNode()

    init {
        drumsPlayerNode.loadFile("drums.mp3")
        bassPlayerNode.loadFile("bass.mp3")

        audioGraph.addNode(drumsPlayerNode)
        audioGraph.addNode(drumsGainNode)
        audioGraph.addNode(bassPlayerNode)
        audioGraph.addNode(bassGainNode)
        audioGraph.addNode(mixerNode)

        audioGraph.connect(drumsPlayerNode, drumsGainNode)
        audioGraph.connect(bassPlayerNode, bassGainNode)
        audioGraph.connect(drumsGainNode, mixerNode)
        audioGraph.connect(bassGainNode, mixerNode)
        audioGraph.connect(mixerNode, audioGraph.outputNode)
        
        audioEngine.start(audioGraph)
    }

    fun play() {
        drumsPlayerNode.play()
        bassPlayerNode.play()
    }

    fun pause() {
        drumsPlayerNode.pause()
        bassPlayerNode.pause()
    }

    fun setDrumsVolume(newValue: Float) {
        drumsGainNode.setGain(newValue)
    }

    fun setBassVolume(newValue: Float) {
        bassGainNode.setGain(newValue)
    }
}