Do you even jam bruh?

Transcript

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
27. None

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