Do you even jam bruh? - Speaker Deck

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DO YOU EVEN JAM BRUH?

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DO YOU??

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bit.ly/reactbangalore twitter slack

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@siddharthkp

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javascript architect @practo open source github.com/siddharthkp youtube thingy bit.ly/jsshow

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Web Audio API

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AudioContext input → effects → destination

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AudioContext input → effects → destination OscillatorNode AudioBuffer

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AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper

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AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper Audio MediaStream

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Web Audio API Full spec: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API

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AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper Audio MediaStream

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AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper Audio MediaStream

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AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) oscillator.connect(context.destination) oscillator.start() setTimeout(() => oscillator.stop(), 1000) AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) const gainEffect = context.createGain() oscillator.connect(context.destination) oscillator.start() setTimeout(() => oscillator.stop(), 1000) AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) const gainEffect = context.createGain() gainEffect.gain.setValueAtTime(10, context.currentTime) oscillator.connect(context.destination) oscillator.start() setTimeout(() => oscillator.stop(), 1000) AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) const gainEffect = context.createGain() gainEffect.gain.setValueAtTime(10, context.currentTime) oscillator.connect(gainEffect).connect(context.destination) oscillator.start() setTimeout(() => oscillator.stop(), 1000) AudioContext ↓ destination ↓ effect input

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const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) oscillator.type = 'square' // sine, square, triangle, sawtooth const gainEffect = context.createGain() gainEffect.gain.setValueAtTime(10, context.currentTime) oscillator.connect(gainEffect).connect(context.destination) oscillator.start() setTimeout(() => oscillator.stop(), 1000) AudioContext ↓ destination ↓ effect input

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AudioContext ↓ destination ↓ effect const context = new(window.AudioContext || window.webkitAudioContext) const source = context.createBufferSource() const url = './audio/snare.wav' input

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AudioContext ↓ destination ↓ effect const context = new(window.AudioContext || window.webkitAudioContext) const source = context.createBufferSource() const url = './audio/snare.wav' new BufferLoader(context, url, audioBuffer => { source.buffer = audioBuffer }).load() input

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No content

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• • • • • • • •

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• • • • • • • • kick x x x x x x x x

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• • • • • • • • kick x----- x----- x----- x----- x----- x----- x----- x-----

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• • • • • • • • kick x x x x x x x x

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• • • • • • • • kick x x x x x x x x snare x x x x

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• • • • • • • • kick x x x x x x x x snare x x x x hihat x x x x x x x x

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• • • • • • • • kick x x x x x x x x snare x x x x hihat x x x x x x x x bass E E E E B B B B

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• • • • • • • • kick x x x x x x x x snare x x x x hihat x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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React

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• • • • • • • • kick x x x x x x x x snare x x x x hihat x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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kick x x x x x x x x snare x x x x hihat x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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x x x x x x x x snare x x x x hihat x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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class Kick extends React.Component { }

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class Kick extends React.Component { constructor () { } componentDidMount () { } render () { } }

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class Kick extends React.Component { constructor () { super(props) this.state = { notes: this.props.children.split(' ') } } componentDidMount () { } render () { } }

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class Kick extends React.Component { constructor () { super(props) this.state = { notes: this.props.children.split(' ') } } componentDidMount () { loadInstrument('kick').then(source => { this.setState({ source }) }) } render () { } }

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x x x x x x x x x x x x hihat x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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x x x x x x x x x o x o x o x o hihat x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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class Kick extends React.Component { constructor () { ... } componentDidMount () { ... } render () { this.state.notes.map((note, index) => { if (index !== 'o') { setTimeout(() => this.state.source.play(), index * 500) } }) } }

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x x x x x x x x x o x o x o x o x x x x x x x x bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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x x x x x x x x x o x o x o x o x x x x x x x x E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1

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class Bass extends React.Component { constructor () { ... } componentDidMount () { ... } render () { this.state.notes.map((note, index) => { setTimeout(() => { this.state.source.frequency.value = getFrequency(note) this.state.source.play()) }, index * 500) }) } }

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const chords = { C: 65.406, D: 73.416, E: 82.407, F: 87.307, G: 97.999, B: 123.471, }

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const chords = { C: 65.406, C1: 32.703, D: 73.416, D1: 36.708, E: 82.407, E1: 41.203, F: 87.307, F1: 43.654, G: 97.999, G1: 48.999, B: 123.471, B1: 61.735 }

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const chords = { C: 65.406, C1: 32.703, D: 73.416, D1: 36.708, E: 82.407, E1: 41.203, F: 87.307, F1: 43.654, G: 97.999, G1: 48.999, B: 123.471, B1: 61.735 } const getFrequency = note => { return chords[note] }

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x x x x x x x x x o x o x o x o x x x x x x x x E E E E B B B B E2 E2 G2 E2 D2 C2 B1

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• • • • • • • • E2 E2 G2 E2 D2 C2 B1

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• • • • • • • • E2 E2 G2 E2 D2 C2 B1 E2 E2 G2 E2 D2 C2 B1

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• • • • • • • • E2 E2 G2 E2 D2 C2 B1 E2 E2 G2 E2 D2 C2 B1

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class Lead extends React.Component { constructor () { ... } componentDidMount () { ... } render () { this.props.children.map((child, index) => { setTimeout(() => { this.state.source.frequency.value = getFrequency(child.props.chord) this.state.source.play()) }, child.props.time * 1000) }) } }

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Speech Synthesis API

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const synth = window.speechSynthesis const voices = synth.getVoices()

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const synth = window.speechSynthesis const voices = synth.getVoices() const text = 'Hello world' const speech = new SpeechSynthesisUtterance(text); speech.voice = voices[0]

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const synth = window.speechSynthesis const voices = synth.getVoices() const text = 'Hello world' const speech = new SpeechSynthesisUtterance(text); speech.voice = voices[53] synth.speak(speech)

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@siddharthkp twitter github