Vue2 使用 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

效果图如下：

安装插件

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

在main.js中使用

import Vue from 'vue';
import VueKonva from 'vue-konva';

Vue.use(VueKonva);
1
2
3
4

相关实现代码

html

<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 }}xdiv>
            <el-dropdown-menu slot="dropdown">
              <el-dropdown-item command="1">0.5xel-dropdown-item>
              <el-dropdown-item command="2">1xel-dropdown-item>
              <el-dropdown-item command="3">1.5xel-dropdown-item>
              <el-dropdown-item command="4">2xel-dropdown-item>
              <el-dropdown-item command="5">3xel-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>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58

相关方法

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();
      }
    },
  },
};
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403

css样式

.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;
      }
    }
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62