Do you even jam bruh?

Experiments with Web Audio API and React

1. DO YOU EVEN JAM BRUH?
2. DO YOU??
3. bit.ly/reactbangalore twitter slack
4. @siddharthkp
5. javascript architect @practo open source github.com/siddharthkp youtube thingy bit.ly/jsshow
6. Web Audio API
7. AudioContext input → effects → destination
8. AudioContext input → effects → destination OscillatorNode AudioBuffer
9. AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper
10. AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper Audio MediaStream
11. Web Audio API Full spec: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API
12. AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper Audio MediaStream
13. AudioContext input → effects → destination OscillatorNode AudioBuffer BiquadFilter GainNode WaveShaper Audio MediaStream
14. AudioContext ↓ destination ↓ effect input
15. const context = new(window.AudioContext || window.webkitAudioContext) AudioContext ↓ destination ↓ effect input
16. const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() AudioContext ↓ destination ↓ effect input
17. const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) AudioContext ↓ destination ↓ effect input
18. const context = new(window.AudioContext || window.webkitAudioContext) const oscillator = context.createOscillator() oscillator.frequency.setValueAtTime(400, context.currentTime) oscillator.connect(context.destination) AudioContext ↓ destination ↓ effect input
19. 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
20. 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
21. 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
22. 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
23. 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
24. AudioContext ↓ destination ↓ effect const context = new(window.AudioContext || window.webkitAudioContext) const source = context.createBufferSource() const url = './audio/snare.wav' input
25. 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
26. 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 source.connect(context.destination) source.start() }).load() input
28. • • • • • • • •
29. • • • • • • • • kick x x x x x x x x
30. • • • • • • • • kick x----- x----- x----- x----- x----- x----- x----- x-----
31. • • • • • • • • kick x x x x x x x x
32. • • • • • • • • kick x x x x x x x x snare x x x x
33. • • • • • • • • kick x x x x x x x x snare x x x x hihat x x x x x x x x
34. • • • • • • • • 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
35. • • • • • • • • 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
36. React
37. • • • • • • • • 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
38. <Song> 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 </Song>
39. <Song> <Kick> x x x x x x x x </Kick> 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 </Song>
40. class Kick extends React.Component { }
41. class Kick extends React.Component { constructor () { } componentDidMount () { } render () { } }
42. class Kick extends React.Component { constructor () { super(props) this.state = { notes: this.props.children.split(' ') } } componentDidMount () { } render () { } }
43. class Kick extends React.Component { constructor () { super(props) this.state = { notes: this.props.children.split(' ') } } componentDidMount () { loadInstrument('kick').then(source => { this.setState({ source }) }) } render () { } }
44. class Kick extends React.Component { constructor () { super(props) this.state = { notes: this.props.children.split(' ') } } componentDidMount () { loadInstrument('kick').then(source => { this.setState({ source }) }) } render () { this.state.notes.map((note, index) => { setTimeout(() => this.state.source.play(), index * 500) }) } }
45. <Song> <Kick> x x x x x x x x </Kick> <Snare> x x x x </Snare> 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 </Song>
46. <Song> <Kick> x x x x x x x x </Kick> <Snare> x o x o x o x o </Snare> 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 </Song>
47. class Kick extends React.Component { constructor () { ... } componentDidMount () { ... } render () { this.state.notes.map((note, index) => { if (index !== 'o') { setTimeout(() => this.state.source.play(), index * 500) } }) } }
48. <Song> <Kick> x x x x x x x x </Kick> <Snare> x o x o x o x o </Snare> <Hihat> x x x x x x x x </Hihat> bass E E E E B B B B lead E2 E2 G2 E2 D2 C2 B1 </Song>
49. <Song> <Kick> x x x x x x x x </Kick> <Snare> x o x o x o x o </Snare> <Hihat> x x x x x x x x </Hihat> <Bass> E E E E B B B B </Bass> lead E2 E2 G2 E2 D2 C2 B1 </Song>
50. 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) }) } }
51. const chords = { C: 65.406, D: 73.416, E: 82.407, F: 87.307, G: 97.999, B: 123.471, }
52. 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 }
53. 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] }
54. <Song> <Kick> x x x x x x x x </Kick> <Snare> x o x o x o x o </Snare> <Hihat> x x x x x x x x </Hihat> <Bass> E E E E B B B B </Bass> <Lead> E2 E2 G2 E2 D2 C2 B1 </Lead> </Song>
55. • • • • • • • • <Lead> E2 E2 G2 E2 D2 C2 B1 </Lead>
56. • • • • • • • • E2 E2 G2 E2 D2 C2 B1 <Lead> <Note> E2 </Note> <Note> E2 </Note> <Note> G2 </Note> <Note> E2 </Note> <Note> D2 </Note> <Note> C2 </Note> <Note> B1 </Note> </Lead>
57. • • • • • • • • E2 E2 G2 E2 D2 C2 B1 <Lead> <Note time = "0" duration = "0.75" > E2 </Note> <Note time = "0.75" duration = "0.25" > E2 </Note> <Note time = "1" duration = "0.25" > G2 </Note> <Note time = "1.375" duration = "0.25" > E2 </Note> <Note time = "1.75" duration = "0.25" > D2 </Note> <Note time = "2" duration = "1" > C2 </Note> <Note time = "3" duration = "1" > B1 </Note> </Lead>
58. 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) }) } }
59. Speech Synthesis API
60. const synth = window.speechSynthesis const voices = synth.getVoices()
61. const synth = window.speechSynthesis const voices = synth.getVoices() const text = 'Hello world' const speech = new SpeechSynthesisUtterance(text); speech.voice = voices[0]
62. const synth = window.speechSynthesis const voices = synth.getVoices() const text = 'Hello world' const speech = new SpeechSynthesisUtterance(text); speech.voice = voices[53] synth.speak(speech)
63. @siddharthkp twitter github