Vue2 使用 Knova Canvas 合成图片、多个视频、音频在一个画面中并播放，自定义 video control 控制条

本文转载https://blog.csdn.net/RosaChampagne/article/details/128020428?spm=1001.2014.3001.5502的文章

安装插件

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1	npm install vue-konva@2 konva --save

在main.js中使用

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import Vue from 'vue'; import VueKonva from 'vue-konva';   Vue.use(VueKonva);

相关实现代码

html

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<template>   <div class="video-preview-wrapper">     <div ref="videoPreviewBox" class="video-preview-box">       <div class="video-box">         <v-stage ref="stage" :config="stageConfig" @click="onControl">           <v-layer ref="layer">             <v-image ref="frame" :config="imageConfig" />           </v-layer>           <v-layer>             <v-image v-for="(cover, index) in videoCovers" :key="index" :config="cover" />           </v-layer>         </v-stage>       </div>       <div class="control-play">         <div class="control-play-btn" @click="onControl">           <i             :class="[{ 'el-icon-video-pause': isPlay }, { 'el-icon-video-play': !isPlay }]"           />         </div>         <div class="control-progress common-progress">           <div>             <el-slider               v-model="videoProgress"               :show-tooltip="false"               :max="canvas.duration"               input-size="small"               @change="onProgressChange"             />           </div>         </div>         <div class="current-time">{{ currentTime }}</div>         /         <div class="duration">{{ duration }}</div>         <div class="video-speed-box">           <el-dropdown placement="bottom" @command="onCommand">             <div class="video-speed-show">{{ playbackRate }}x</div>             <el-dropdown-menu slot="dropdown">               <el-dropdown-item command="1">0.5x</el-dropdown-item>               <el-dropdown-item command="2">1x</el-dropdown-item>               <el-dropdown-item command="3">1.5x</el-dropdown-item>               <el-dropdown-item command="4">2x</el-dropdown-item>               <el-dropdown-item command="5">3x</el-dropdown-item>             </el-dropdown-menu>           </el-dropdown>         </div>         <div class="control-voice common-progress">           <span class="voice-icon" />           <div class="voice-slider">             <el-slider v-model="voiceProgress" input-size="small" @change="onVoiceChange" />           </div>         </div>         <div class="fullscreen" title="全屏" @click="onFullScreen">           <i class="el-icon-full-screen" />         </div>       </div>     </div>   </div> </template>

相关方法

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export default {   name: 'VideoPreview',   data() {     return {       stageConfig: {         width: window.innerWidth,         height: (window.innerHeight - 64),       },       imageConfig: {         image: null,         width: window.innerWidth,         height: (window.innerHeight - 64),       },       canvas: {         duration: 10,         volume: 1,         playbackRate: 1,         frames: [           {             imageUrl: require('./bg1.jpg'),             duration: 3,             videos: [               {                 x: 20,                 y: 100,                 width: 200,                 height: 200,                 cover: require('./VfE_html5.jpg'),                 url: require('./VfE_html5.mp4'),                 volume: 1,                 playbackRate: 1,               },               {                 x: 420,                 y: 100,                 width: 200,                 height: 200,                 cover: require('./video_thumb.jpg'),                 url: require('./video.mp4'),                 volume: 1,                 playbackRate: 1,               },             ],             audios: [               {                 url: require('./dengnixiake.flac'),                 volume: 1,               },             ],           },           {             imageUrl: require('./bg2.jpg'),             duration: 3,             videos: [               {                 x: 100,                 y: 100,                 width: 200,                 height: 200,                 cover: require('./VfE_html5.jpg'),                 url: require('./flower.mp4'),                 volume: 1,                 playbackRate: 1,               },             ],             audios: [],           },           {             imageUrl: require('./bg3.jpg'),             duration: 2,             videos: [],             audios: [               {                 url: require('./shuohaobuku.flac'),                 volume: 1,               },             ],           },           {             imageUrl: require('./bg4.jpg'),             duration: 2,             videos: [],             audios: [],           },         ],       },       videoCovers: [],       videos: [],       audios: [],       isPlay: false,       duration: 0,       currentTime: '00:00:00',       videoProgress: 0,       playbackRate: 1,       voiceProgress: 100,       videoTimeTimer: null,       videoSceneTimer: null,       videoTimers: [],       audioTimers: [],     };   },   watch: {     videoProgress(value) {       // 如果播放完成，则暂停播放，清除视频时间定时器       if (value === this.canvas.duration) {         this.isPlay = false;         clearInterval(this.videoTimeTimer);       }       // 更换视频背景图       this.canvas.frames.forEach(({ imageUrl, startAt, endAt }) => {         if (value >= startAt && value < endAt) {           const img = new Image();           img.src = imageUrl;           img.onload = () => {             if (`http://localhost:8080${imageUrl}` !== this.imageConfig.image.src) {               this.imageConfig.image = img;             }           };         }       });         // 暂停不在播放时间范围内的窗口视频       this.videos         .filter(({ startAt, endAt }) => (this.videoProgress < startAt || this.videoProgress > endAt))         .forEach(({ videoObj }) => {           videoObj.pause();           videoObj.currentTime = 0;         });         // 暂停不在播放时间范围内的音频       this.audios         .filter(({ startAt, endAt }) => (this.videoProgress < startAt || this.videoProgress > endAt))         .forEach(({ audioObj }) => {           audioObj.pause();           audioObj.currentTime = 0;         });     },   },   created() {     this.duration = this.formatVideoTime(this.canvas.duration);     // 计算出每一个场景的开始时间、结束时间     const durationList = this.canvas.frames.map(({ duration }) => duration);     durationList.reduce((prev, current, idx) => {       if (idx <= 1) {         this.canvas.frames[0].startAt = 0;         this.canvas.frames[0].endAt = prev;       }       this.canvas.frames[idx].startAt = prev;       this.canvas.frames[idx].endAt = prev + current;       return prev + current;     });       // 将所有场景的窗口视频、音频初始化     this.canvas.frames.forEach(({ videos, audios, startAt, endAt }) => {       videos.forEach((video) => {         const videoObj = document.createElement('video');         videoObj.src = video.url;         videoObj.muted = true;         videoObj.addEventListener('play', () => {           this.videoCovers = [];           this.timerCallback();         });         this.videos.push({           videoObj,           x: video.x,           y: video.y,           width: video.width,           height: video.height,           startAt,           endAt,         });       });         audios.forEach((audio) => {         const audioObj = document.createElement('audio');         audioObj.src = audio.url;         audioObj.volume = audio.volume;         this.audios.push({ audioObj, startAt, endAt });       });     });       if (this.canvas.frames?.[0]) {       // 第一个场景的视频封面       this.videoCovers = this.canvas.frames[0].videos?.map(({ cover, x, y, width, height }) => {         const image = new Image();         image.src = cover;         return { x, y, width, height, image };       });       // 第一个场景的背景图       const img = new Image();       img.src = this.canvas.frames[0].imageUrl;       img.onload = () => {         this.imageConfig.image = img;       };     }   },   mounted() {     this.ctx = this.$refs.frame.getNode().getContext('2d');     // 在没有cover的情况下，可设置视频首帧为封面     this.videos       .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))       .forEach(({ videoObj, x, y, width, height }) => {         videoObj.addEventListener('loadeddata', () => {           videoObj.play();           this.ctx.drawImage(videoObj, x, y, width, height);           setTimeout(() => {             videoObj.pause();           }, 100);         });       });   },   methods: {     timerCallback() {       this.videos         .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))         .forEach(({ videoObj, x, y, width, height }) => {           if (videoObj.paused || videoObj.ended) {             return;           }           this.ctx.drawImage(videoObj, x, y, width, height);           clearTimeout(this.videoSceneTimer);           this.videoSceneTimer = setTimeout(() => {             this.timerCallback();           }, 0);         });     },     onControl() {       this.isPlay = !this.isPlay;       if (this.canvas.duration <= this.videoProgress) {         this.videoProgress = 0;       }       this.controlPlay();     },     onProgressChange(val) {       // 设置窗口小视频的播放进度       this.videos         .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))         .forEach(({ videoObj, startAt }) => {           videoObj.currentTime = val - startAt;         });       // 设置音频的播放进度       this.audios         .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))         .forEach(({ audioObj, startAt }) => {           audioObj.currentTime = val - startAt;         });       this.updateVideoProgress();       this.controlPlay();       // 显示在播放时间范围内的窗口视频       this.videos         .filter(({ startAt, endAt }) => (this.videoProgress > startAt && this.videoProgress < endAt))         .forEach(({ videoObj, x, y, width, height }) => {           videoObj.play();           this.ctx.drawImage(videoObj, x, y, width, height);           setTimeout(() => {             videoObj.pause();           }, 100);         });     },     controlPlay() {       clearInterval(this.videoTimeTimer);       if (this.isPlay) {         // 定时器定时更新视频时间         this.videoTimeTimer = setInterval(() => {           this.updateVideoProgress();         }, 1000 / this.playbackRate);       }         this.videoTimers = [];       this.audioTimers = [];       this.videos.forEach(({ videoObj, startAt, endAt }) => {         // 控制视频的播放、暂停         if (this.videoProgress >= startAt && this.videoProgress < endAt) {           if (this.isPlay) {             videoObj.play();           } else {             videoObj.pause();           }         }         // 控制即将播放的视频的播放、暂停         if (this.videoProgress < startAt) {           const videoTimer = setTimeout(() => {             if (this.isPlay) {               videoObj.play();             } else {               videoObj.pause();             }           }, (startAt - this.videoProgress + 1) * 1000);           this.videoTimers.push(videoTimer);         }       });       this.audios.forEach(({ audioObj, startAt, endAt }) => {         // 控制音频的播放、暂停         if (this.videoProgress >= startAt && this.videoProgress < endAt) {           if (this.isPlay) {             audioObj.play();           } else {             audioObj.pause();           }         }         // 控制即将播放的音频的播放、暂停         if (this.videoProgress < startAt) {           const audioTimer = setTimeout(() => {             if (this.isPlay) {               audioObj.play();             } else {               audioObj.pause();             }           }, (startAt - this.videoProgress + 1) * 1000);           this.audioTimers.push(audioTimer);         }       });     },     updateVideoProgress() {       if (this.videoProgress >= this.canvas.duration) {         this.videoProgress = this.canvas.duration;       } else {         this.videoProgress += 1;       }       this.currentTime = this.formatVideoTime(this.videoProgress);     },     formatVideoTime(time) {       const currentTime = time;       let hour = parseInt(currentTime / 3600, 10);       let minute = parseInt((currentTime % 3600) / 60, 10);       let seconds = parseInt(currentTime % 60, 10);       hour = hour < 10 ? `0${hour}` : hour;       minute = minute < 10 ? `0${minute}` : minute;       seconds = seconds < 10 ? `0${seconds}` : seconds;       return `${hour}:${minute}:${seconds}`;     },     onCommand(val) {       let playbackRate = 0;       switch (val) {         case '1':           playbackRate = 0.5;           break;         case '2':           playbackRate = 1;           break;         case '3':           playbackRate = 1.5;           break;         case '4':           playbackRate = 2;           break;         case '5':           playbackRate = 3;           break;           default:           playbackRate = 1;           break;       }       this.playbackRate = playbackRate;       this.videos         .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))         .forEach(({ videoObj }) => {           videoObj.playbackRate = playbackRate;         });       this.audios         .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))         .forEach(({ audioObj }) => {           audioObj.playbackRate = playbackRate;         });     },     onVoiceChange(val) {       const newVolume = val / 100;       this.audios         .filter(({ startAt, endAt }) => (this.videoProgress >= startAt && this.videoProgress < endAt))         .forEach(({ audioObj }) => {           audioObj.volume = newVolume;         });     },     onFullScreen() {       const element = this.$refs.videoPreviewBox;       const isFullScreen = document.fullscreen || document.mozFullScreen || document.webkitIsFullScreen ||       document.webkitFullScreen || document.msFullScreen;       if (isFullScreen) {         if (document.exitFullscreen) {           document.exitFullscreen();         } else if (document.mozCancelFullScreen) {           document.mozCancelFullScreen();         } else if (document.msExitFullscreen) {           document.msExitFullscreen();         } else if (document.webkitExitFullscreen) {           document.webkitExitFullscreen();         }         return;       }         if (element.requestFullscreen) {         element.requestFullscreen();       } else if (element.mozRequestFullScreen) {         element.mozRequestFullScreen();       } else if (element.msRequestFullscreen) {         element.msRequestFullscreen();       } else if (element.webkitRequestFullscreen) {         element.webkitRequestFullScreen();       }     },   }, };

css样式

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.video-preview-wrapper {   position: relative;   height: 100%;     .video-preview-box {     .video-box {       position: absolute;     }       .control-play {       width: 100%;       position: absolute;       left: 0;       bottom: 5%;       display: flex;       align-items: center;       padding: 0 10px;       color: #fff;         .control-play-btn {         margin-right: 20px;         font-size: 24px;         cursor: pointer;       }         .control-progress {         width: 60%;       }         .current-time {         margin: 0 10px 0 20px;       }         .duration {         margin-left: 10px;       }         .video-speed-box {         width: 40px;         display: flex;         justify-content: center;         margin: 0 20px;         background-color: aliceblue;         cursor: pointer;           .el-dropdown {           width: 100%;           text-align: center;         }       }         .control-voice {         width: 10%;       }         .fullscreen {         margin-left: 20px;         cursor: pointer;       }     }   } }