koel/resources/assets/js/components/ui/Equalizer.vue
2022-07-29 14:12:55 +02:00

348 lines
8 KiB
Vue

<template>
<div id="equalizer" data-testid="equalizer" ref="root">
<div class="presets">
<label class="select-wrapper">
<select v-model="selectedPresetId">
<option disabled value="-1">Preset</option>
<option v-for="preset in presets" :value="preset.id" :key="preset.id" v-once>{{ preset.name }}</option>
</select>
<icon :icon="faAngleDown" class="arrow text-highlight" size="sm"/>
</label>
</div>
<div class="bands">
<span class="band preamp">
<span class="slider"></span>
<label>Preamp</label>
</span>
<span class="indicators">
<span>+20</span>
<span>0</span>
<span>-20</span>
</span>
<span class="band amp" v-for="band in bands" :key="band.label">
<span class="slider"></span>
<label>{{ band.label }}</label>
</span>
</div>
</div>
</template>
<script lang="ts" setup>
import noUiSlider from 'nouislider'
import { faAngleDown } from '@fortawesome/free-solid-svg-icons'
import { nextTick, onMounted, ref, watch } from 'vue'
import { eventBus } from '@/utils'
import { equalizerStore, preferenceStore as preferences } from '@/stores'
import { audioService as audioService } from '@/services'
interface Band {
label: string
filter: BiquadFilterNode
}
let context!: AudioContext
let preampGainNode!: GainNode
const root = ref<HTMLElement>()
const bands = ref<Band[]>([])
const preampGainValue = ref(0)
const selectedPresetId = ref(-1)
const presets: EqualizerPreset[] = Object.assign([], equalizerStore.presets)
const changePreampGain = (dbValue: number) => {
preampGainValue.value = dbValue
preampGainNode.gain.setTargetAtTime(Math.pow(10, dbValue / 20), context.currentTime, 0.01)
}
const changeFilterGain = (filter: BiquadFilterNode, value: number) => {
filter.gain.setTargetAtTime(value, context.currentTime, 0.01)
}
const createSliders = () => {
const config = equalizerStore.get()!
root.value?.querySelectorAll<SliderElement>('.slider').forEach((el, i) => {
el.noUiSlider?.destroy()
noUiSlider.create(el, {
connect: [false, true],
// the first element is the preamp. The rest are gains.
start: i === 0 ? config.preamp : config.gains[i - 1],
range: { min: -20, max: 20 },
orientation: 'vertical',
direction: 'rtl'
})
if (!el.noUiSlider) {
throw new Error(`Failed to initialize slider on element ${i}`)
}
el.noUiSlider.on('slide', (values, handle) => {
if (el.parentElement!.matches('.preamp')) {
changePreampGain(values[handle])
} else {
changeFilterGain(bands.value[i - 1].filter, values[handle])
}
})
el.noUiSlider.on('change', () => {
// User has customized the equalizer. No preset should be selected.
selectedPresetId.value = -1
save()
})
})
// Now we set this value to trigger the audio processing.
selectedPresetId.value = preferences.selectedPreset
}
const init = async () => {
const config = equalizerStore.get()!
context = audioService.getContext()
preampGainNode = context.createGain()
changePreampGain(config.preamp)
const source = audioService.getSource()
source.connect(preampGainNode)
let prevFilter: BiquadFilterNode
// Create 10 bands with the frequencies similar to those of Winamp and connect them together.
const frequencies = [60, 170, 310, 600, 1_000, 3_000, 6_000, 12_000, 14_000, 16_000]
frequencies.forEach((frequency, i) => {
const filter = context.createBiquadFilter()
if (i === 0) {
filter.type = 'lowshelf'
} else if (i === 9) {
filter.type = 'highshelf'
} else {
filter.type = 'peaking'
}
filter.gain.setTargetAtTime(0, context.currentTime, 0.01)
filter.Q.setTargetAtTime(1, context.currentTime, 0.01)
filter.frequency.setTargetAtTime(frequency, context.currentTime, 0.01)
prevFilter ? prevFilter.connect(filter) : preampGainNode.connect(filter)
prevFilter = filter
bands.value.push({
filter,
label: String(frequency).replace('000', 'K')
})
})
prevFilter!.connect(context.destination)
await nextTick()
createSliders()
}
const save = () => equalizerStore.set(preampGainValue.value, bands.value.map(band => band.filter.gain.value))
const loadPreset = (preset: EqualizerPreset) => {
root.value?.querySelectorAll<SliderElement>('.slider').forEach((el, i) => {
if (!el.noUiSlider) {
throw new Error('Preset can only be loaded after sliders have been set up')
}
// We treat our preamp slider differently.
if (el.parentElement!.matches('.preamp')) {
changePreampGain(preset.preamp)
// Update the slider values into GUI.
el.noUiSlider.set(preset.preamp)
} else {
changeFilterGain(bands.value[i - 1].filter, preset.gains[i - 1])
// Update the slider values into GUI.
el.noUiSlider.set(preset.gains[i - 1])
}
})
save()
}
watch(selectedPresetId, () => {
preferences.selectedPreset = selectedPresetId.value
selectedPresetId.value !== -1 && loadPreset(equalizerStore.getPresetById(selectedPresetId.value)!)
})
onMounted(() => eventBus.on('INIT_EQUALIZER', () => init()))
</script>
<style lang="scss">
#equalizer {
user-select: none;
position: absolute;
bottom: var(--footer-height);
width: 100%;
background: var(--color-bg-primary);
display: flex;
flex-direction: column;
left: 0;
label {
margin-top: 8px;
margin-bottom: 0;
text-align: left;
}
.presets {
padding: 8px 16px;
display: flex;
flex-wrap: wrap;
justify-content: space-between;
flex: 1;
align-content: center;
z-index: 1;
border-bottom: 1px solid rgba(255, 255, 255, .1);
.select-wrapper {
position: relative;
margin-bottom: 0;
.arrow {
margin-left: -14px;
pointer-events: none;
}
}
select {
background: none;
color: var(--color-text-primary);
padding-left: 0;
width: 100px;
text-transform: none;
option {
color: var(--color-black);
}
}
}
.bands {
padding: 16px;
z-index: 1;
left: 0;
display: flex;
justify-content: space-between;
align-items: flex-start;
label, .indicators {
font-size: .8rem;
}
.band {
display: flex;
flex-direction: column;
align-items: center;
}
.slider {
height: 100px;
}
.indicators {
height: 100px;
width: 20px;
display: flex;
flex-direction: column;
justify-content: space-between;
align-items: center;
margin-left: -16px;
opacity: 0;
transition: .4s;
span:first-child {
line-height: 8px;
}
span:last-child {
line-height: 8px;
}
}
&:hover .indicators {
opacity: 1;
}
}
.noUi {
&-connect {
background: none;
box-shadow: none;
&::after {
content: " ";
position: absolute;
width: 2px;
height: 100%;
top: 0;
left: 7px;
}
}
&-touch-area {
cursor: ns-resize;
}
&-target {
background: transparent;
border-radius: 0;
border: 0;
box-shadow: none;
width: 16px;
&::after {
content: " ";
position: absolute;
width: 2px;
height: 100%;
background: linear-gradient(to bottom, var(--color-highlight) 0%, var(--color-highlight) 36%, var(--color-green) 100%);
background-size: 2px;
top: 0;
left: 7px;
}
}
&-handle {
border: 0;
border-radius: 0;
box-shadow: none;
cursor: pointer;
&::before, &::after {
display: none;
}
}
&-vertical {
.noUi-handle {
width: 16px;
height: 2px;
left: -16px;
top: 0;
}
}
}
@media only screen and (max-width: 768px) {
position: fixed;
max-width: 414px;
left: auto;
right: 0;
bottom: calc(var(--footer-height-mobile) + 0px);
display: block;
height: auto;
label {
line-height: 20px;
}
}
}
</style>