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<!--
- @copyright Copyright (c) 2020, Daniel Calviño Sánchez (danxuliu@gmail.com)
-
- @license GNU AGPL version 3 or any later version
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU Affero General Public License as
- published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-->
<template>
<div class="mediaDevicesPreview">
<MediaDevicesSelector kind="audioinput"
:devices="devices"
:device-id="audioInputId"
@update:deviceId="audioInputId = $event" />
<div class="preview preview-audio">
<div v-if="!audioPreviewAvailable"
class="preview-not-available">
<AlertCircle v-if="audioStreamError"
:size="64"
title=""
fill-color="#999" />
<MicrophoneOff v-else-if="!audioInputId"
:size="64"
title=""
fill-color="#999" />
<div v-else-if="!audioStream"
class="icon icon-loading" />
<p v-if="audioStreamErrorMessage">
{{ audioStreamErrorMessage }}
</p>
</div>
<!-- v-show has to be used instead of v-if/else to ensure that the
reference is always valid once mounted. -->
<div v-show="audioPreviewAvailable"
class="volume-indicator-wrapper">
<Microphone :size="64"
title=""
fill-color="#999" />
<span ref="volumeIndicator"
class="volume-indicator"
:style="{ 'height': currentVolumeIndicatorHeight + 'px' }" />
</div>
</div>
<MediaDevicesSelector kind="videoinput"
:devices="devices"
:device-id="videoInputId"
@update:deviceId="videoInputId = $event" />
<div class="preview preview-video">
<div v-if="!videoPreviewAvailable"
class="preview-not-available">
<AlertCircle v-if="videoStreamError"
:size="64"
title=""
fill-color="#999" />
<VideoOff v-else-if="!videoInputId"
:size="64"
title=""
fill-color="#999" />
<div v-else-if="!videoStream"
class="icon icon-loading" />
<p v-if="videoStreamErrorMessage">
{{ videoStreamErrorMessage }}
</p>
</div>
<!-- v-show has to be used instead of v-if/else to ensure that the
reference is always valid once mounted. -->
<video v-show="videoPreviewAvailable"
ref="video"
disablePictureInPicture="true"
tabindex="-1" />
</div>
</div>
</template>
<script>
import AlertCircle from 'vue-material-design-icons/AlertCircle'
import Microphone from 'vue-material-design-icons/Microphone'
import MicrophoneOff from 'vue-material-design-icons/MicrophoneOff'
import VideoOff from 'vue-material-design-icons/VideoOff'
import MediaDevicesSelector from './MediaDevicesSelector'
import { devices } from '../mixins/devices'
export default {
name: 'MediaDevicesPreview',
components: {
AlertCircle,
MediaDevicesSelector,
Microphone,
MicrophoneOff,
VideoOff,
},
mixins: [devices],
data() {
return {
mounted: false,
currentVolume: -100,
volumeThreshold: -100,
}
},
computed: {
currentVolumeIndicatorHeight() {
// refs can not be accessed on the initial render, only after the
// component has been mounted.
if (!this.mounted) {
return 0
}
// WebRTC volume goes from -100 (silence) to 0 (loudest sound in the
// system); for the volume indicator only sounds above the threshold
// are taken into account.
let currentVolumeProportion = 0
if (this.currentVolume > this.volumeThreshold) {
currentVolumeProportion = (this.volumeThreshold - this.currentVolume) / this.volumeThreshold
}
const volumeIndicatorStyle = window.getComputedStyle ? getComputedStyle(this.$refs.volumeIndicator, null) : this.$refs.volumeIndicator.currentStyle
const maximumVolumeIndicatorHeight = this.$refs.volumeIndicator.parentElement.clientHeight - (parseInt(volumeIndicatorStyle.bottom, 10) * 2)
return maximumVolumeIndicatorHeight * currentVolumeProportion
},
},
mounted() {
this.mounted = true
},
}
</script>
<style lang="scss" scoped>
.preview {
display: flex;
.icon {
background-size: 64px;
width: 64px;
height: 64px;
opacity: 0.4;
margin-left: auto;
margin-right: auto;
}
}
.preview-not-available p {
margin-bottom: 16px;
}
.preview-audio {
.preview-not-available .icon {
margin-top: 16px;
margin-bottom: 16px;
}
.volume-indicator-wrapper {
/* Make the wrapper the positioning context of the volume indicator. */
position: relative;
margin-top: 16px;
margin-bottom: 16px;
}
.volume-indicator {
position: absolute;
width: 6px;
right: 0;
/* The button height is 64px; the volume indicator button is 56px at
* maximum, but its value will be changed based on the current volume;
* the height change will reveal more or less of the gradient, which has
* absolute dimensions and thus does not change when the height
* changes. */
height: 56px;
bottom: 4px;
background: linear-gradient(0deg, green, yellow, red 54px);
opacity: 0.7;
}
}
.preview-video {
margin-top: 24px;
.preview-not-available .icon {
margin-top: 16px;
margin-bottom: 16px;
}
video {
display: block;
width: 100%;
}
}
</style>
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