web播放器 ffmpeg解码 播放视频流

Question

vue web播放器 h624 ffmpeg解码 播放视频流

参考文章链接
https://blog.csdn.net/kaimo313/article/details/117090375

decoder.js

export default class Decoder {
    init(M) {
        // M = self.Module 即wasm环境变量
        this.M = M
        // 创建wasm的回调函数，viii表示有3个int参数
        const callback = this.M.addFunction(this._handleYUVData, 'viii')
        // 通过我们上面decoder.c文件的方法传入回调
        this.M._init_decoder(callback)
    }

    decode(packet) {
        const { data } = packet
        const typedArray = data
        const bufferLength = typedArray.length
        // 申请内存区，并放入数据
        const bufferPtr = this.M._malloc(bufferLength)
        this.M.HEAPU8.set(typedArray, bufferPtr)
        // 解码buffer
        this.M._decode_buffer(bufferPtr, bufferLength)
        // 释放内存区
        this.M._free(bufferPtr)
    }

    _handleYUVData(start, size, pts) {
        // 回调传回来的第一个参数是yuv_buffer的内存起始索引
        const u8s = this.M.HEAPU8.subarray(start, start + size)
        const output = new Uint8Array(u8s)
        this.emit('decoded-frame', {
            data: output,
            pts,
        })
    }
}

decode-manager.js

import Decoder from './decoder'
const global = self

export default class DecoderManager {
    // let loaded = false
    // let decoder = new Decoder()
    // let cachePackets = []

    constructor(loaded, decoder, cachePackets) {
        this.loaded = loaded;
        this.decoder = decoder
        this.cachePackets = cachePackets
    }

    load() {
        // 表明wasm文件的位置
        global.Module = {
            locateFile: (wasm) => './wasm/' + wasm,
        }
        global.importScripts('./wasm/libffmpeg.js')
        // 初始化之后，执行一次push，把缓存的packet送到decoder里
        global.Module.onRuntimeInitialized = () => {
            this.loaded = true
            this.decoder.init(global.Module)
            this.push([])
        }
        // this.decoder.on('decoded-frame', this.handleYUVBuffer)

        // decoder.on('decoded-frame', this.handleYUVBuffer)
    }
    push(packets) {
        // 没加载就缓存起来，加载了就先取缓存
        if (!this.loaded) {
            this.cachePackets = this.cachePackets.concat(packets)
        } else {
            if (this.cachePackets.length) {
                this.cachePackets.forEach((frame) => this.decoder.decode(frame))
                this.cachePackets = []
            }
            packets.forEach((frame) => this.decoder.decode(frame))
        }
    }
    handleYUVBuffer(frame) {
        global.postMessage({
            type: 'decoded-frame',
            data: frame,
        })
    }
}

const manager = new DecoderManager()
manager.load()

self.onmessage = function (event) {
    const data = event.data
    const type = data.type
    switch (type) {
        case 'decode':
            manager.push(data.data)
            break
    }
}

前端调用js部分看不太懂，我的环境是vue2，文章里面是用ts写的，本地把ts 写成 js， js里面的函数报错

我想要达到的结果

有没有做过的友友 可以帮忙解决一下

Answer 1

打印下global，看下面是不是没有importScripts这个方法