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Webで音楽を奏でる
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Transcript
ϒϥβͰԻָΛͰΔ ɹ SpeeeKaigi 2017/08/25 ೋࣾ୩ ߉༎ @nishaya 1
ࣗݾհ • ೋࣾ୩ ߉༎ • GitHub: @nishaya • WebΞϓϦέʔγϣϯΤϯδχΞ •
(ג) Speee ϓϩδΣΫτਪਐࣨ • React2016ʙ 2
લճ·Ͱͷ͋Β͢͡ React/ReduxͰγϯηαΠβʔΛ࡞ͬͨ2 • ԻΛग़͍ͨ͠ͱ͍͏ڧ͍Ϟνϕʔγ ϣϯ • React/Redux৯Θͣݏ͍Λࠀ͢Δ • ࣄલʹ͓͍ͬͯͨ͜ͱͰϓϩδΣ ΫτͰͷ໎͍͕ܰݮ͞Εͨ
2 ReactͰγϯηαΠβʔΛ࡞ͬͨ - Speee DEVELOPER BLOG http://tech.speee.jp/entry/2017/04/06/100000 3
ղܾ͍ͨ͠՝ • ָث͕͚ͳ͍ • Իָཧ͕Θ͔Βͳ͍ • ͍Ζ͍ΖͳԻΛ͍͍ͨ ...͚ͲɺԻָΛͰ͍ͨ 4
Reaktion Multi Track Web Sequencer 5
ָث͕͚ͳ͍ • ָثΛ࡞͍͍͕ͬͨɺ͚ͳ͍ͷͰԻָ͕Ͱ͖ͳ͔ͬͨ • ϒϥβʹࣗಈԋͤ͞Ε͍͍ • ҙͷλΠϛϯάͰԻΛ໐Β͢Έ͕ඞཁ 6
DEMO #1 7
ҙͷλΠϛϯάͰԻΛ໐Β͢ • Ұ൪࠷ॳʹࢥ͍ු͔Ϳͷ setInterval() setTimeout() Ͱϧʔϓ͢Δํ๏ • ਫ਼͕Γͳ͍ •
OscillatorNode.start() AudioBufferSourceNode.start() ʹɺൃԻλΠϛϯάΛε έδϡʔϦϯά͢Δ 8
λΠϛϯά੍ޚͷ • ൃԻλΠϛϯάͷσʔλʮstep = 16Իූ1ͭʯͱ͍͏ ୯ҐͰཧ 9
λΠϛϯά੍ޚͷ • ϧʔϓ͝ͱʹɺݱࡏͷ࣌ࠁ͔Β࣍ʹstepΛ໐Β͢·ͰͷΦϑ ηοτΛࢉग़ t1 • ֤AudioNodeͷ start() ʹઈର࣌ࠁΛ͢ඞཁ͕͋Δͨ Ίɺࢉग़ͨ͠Φϑηοτʹ
AudioContext.currentTime Λ ͨ͠ͷΛൃԻ։࢝λΠϛϯάͱͯ͠εέδϡʔϦϯά͢ Δ t1 ϧʔϓࣗମ setTimeout() Ͱ੍ޚ 10
✅ λΠϛϯά੍ޚ 11
Իָཧ͕Θ͔Βͳ͍ • ԻָΛਅ໘ʹษڧͯ͜͠ͳ͔ͬͨͷͰͲ͏ͬͯۂΛߏ ͨ͠Β͍͍͔Θ͔Βͳ͍ • ੜ͞ΕͨύλʔϯΛΈ߹ΘͤΔํ๏ͳΒ͍͚Δ͔ 12
DEMO #2 13
มԽͷ࿈ʹΑͬͯύλʔϯΛੜ͢Δ • ύλʔϯΛड͚ͯɺ৽͍͠ύλʔϯΛฦ͢ύʔπΛfragment ͱͯ͠ఆٛ • fragmentʹ܁Γฦ͠ɺ֊ஈঢ়ͷมԽɺԻఔͷ্ԼͳͲ͞· ͟·ͳछྨΛ༻ҙ • fragmentΛचͭͳ͗ʹ͢Δ͜ͱͰɺ࠷ॳͷύλʔϯ͔Βେ ͖͘มԽͤ͞Δ͜ͱͰ͖Δ
14
fragmentͷதͰ͍ͬͯΔ͜ͱ transform(steps: Steps): Steps { const newList = steps.list.map((step) =>
{ const note = step.note + this.state.transpose return { ...step, note } }) return { ...steps, list: newList } } 15
✅ ύλʔϯੜ 16
͍Ζ͍ΖͳԻΛ͍͍ͨ • γϯηαΠβʔΛ࡞ͬͨͱ͖oscillatorͱݺΕΔجຊܗ ͔Β͍Ζ͍ΖͳԻ৭Λ࡞͕ͬͨɺγϯηαΠζ͕͍͠Ի(ε τϦϯάͱ͔ɺͱ͔)͍͍ͨ • Իͨ͠Ի͕ͦͷͰ͑ͨΒָͦ͠͏ 17
DEMO #3 18
MediaDevices, MediaRecorderΛ͏ PCʹଓ͞ΕͨϚΠΫΧϝϥΛར༻͢ΔͨΊͷAPI • navigator.mediaDevices.getUserMedia({ audio: true, video: false })
Λݺͼग़͢ͱϚΠΫ༻ͷڐՄΛٻΊΔμ ΠΞϩά͕දࣔ͞ΕΔ 19
MediaDevices, MediaRecorderΛ͏ • Ϣʔβ͕ڐՄ͢ΔͱϚΠΫೖྗ͕ MediaStream ͱͯ͠ಘΒΕ ΔͷͰɺ new MediaRecorder(stream) ΛͬͯԻΛߦ͏
20
Ի৭ͱͯ͠͏ͨΊͷ • ϊʔϚϥΠζͰԻྔΛ࠷దԽ • ಄ग़͠ͱϧʔϓ • Իఔมߋ(υͷ伴൫Λԡͨ͠ΒυͷԻ Ͱ໐ΔΑ͏ʹௐ͢Δ) 21
αϯϓϦϯάσʔλ(flowtype) // @flow export type Sample = { buffer: AudioBuffer,
id: string, name: string, offset: number, loop: boolean, loopStart: number, loopEnd: number, transpose: number, } 22
✅ αϯϓϦϯά 23
https://reaktion.synthesizer.tokyo/ 3 3 FirebaseͰϗεςΟϯάͯ͠·͢ɻূ໌ॻઃఆͯ͘͠Εͯศར 24
·ͱΊ • ࠷ऴతʹѻ͏ཁૉ͕ଟ͘ͳ͕ͬͨɺReactͱFlowtypeʹॿ͚ ΒΕͨ • (Ұൠతʹ)ϒϥβͰΒͳ͍Α͏ͳࣄΛ͢Δͱɺීஈ ͍ͬͯͳ͍APIʹ৮ΕΒΕָ͍ͯ͠ • ͦ͜Ͱಘͨܦݧ͕ϓϩμΫτʹؐݩͰ͖ͨΒૉఢ 25