@fow/puppeteer-source-metadata

v1.0.0

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2 years ago

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SourceMetadata

使用

const puppeteer = require('puppeteer');
const SourceMetadata = require('source-metadata');

(async () => {
  let meta = new SourceMetadata();
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  
  // 尽早的设置page
  meta.setPage(page);

  // 读取到一个资源的meta内容
  meta.on('takeattr', metadata=>{
    console.log(metadata.info.streams);
  })

  // 每隔一段时间, 查看下当前已经解析的资源的列表
  meta.watch(list=>{
    console.log(list);
  })

  page.goto('http://127.0.0.1:8080/index.html');
  

})();

方法

watch(callback, interval=3000)

callback 接收的参数:
- sourceList : array<metadata>
interval: 间隔的毫秒数

meta.watch(sourceList=>{
  console.log(sourceList);
})

sourceList 的具体格式参照下面 metadata 格式章节.

事件

takeattr

成功解析出一个资源的metadata信息后, 会触发此时间

callback 接收一个 metadata 对象作为参数

// 读取到一个资源的meta内容
meta.on('takeattr', metadata=>{
  console.log(metadata.info.streams);
})

pageresponse

页面收到一次资源响应后触发, 无论成功或者失败的响应, 都会触发.

metadata 对象尚未包含资源metadata信息

callback 接收一个 metadata 对象作为参数


meta.on('pageresponse', metadata=>{
  console.log(metadata);
})

matadata 对象

一个完整的metadata对象目前有如下格式:

{
  url: 资源的路径,
  requestHeaders: 浏览器资源请求的header,
  responseHeaders: 浏览器资源响应的header,
  err: Error|null,  响应是否有错误,
  info: Object, 资源的metadata的信息,
}

metadata.info 的格式

{
  format: {},
  streams: []
}

视频的 metadata.info 信息:

{
  "streams": [
    {
      "index": 0,
      "codec_name": "h264",
      "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
      "profile": "Constrained Baseline",
      "codec_type": "video",
      "codec_time_base": "1/48",
      "codec_tag_string": "avc1",
      "codec_tag": "0x31637661",
      "width": 320,
      "height": 180,
      "has_b_frames": 0,
      "sample_aspect_ratio": "1:1",
      "display_aspect_ratio": "16:9",
      "pix_fmt": "yuv420p",
      "level": 13,
      "r_frame_rate": "24/1",
      "avg_frame_rate": "24/1",
      "time_base": "1/24",
      "start_pts": 0,
      "start_time": "0.000000",
      "duration_ts": 14315,
      "duration": "596.458333",
      "bit_rate": "702655",
      "nb_frames": "14315",
      "disposition": {
        "default": 0,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0
      },
      "tags": {
        "creation_time": "1970-01-01 00:00:00",
        "language": "und",
        "handler_name": "\fVideoHandler"
      }
    },
    {
      "index": 1,
      "codec_name": "aac",
      "codec_long_name": "AAC (Advanced Audio Coding)",
      "codec_type": "audio",
      "codec_time_base": "1/48000",
      "codec_tag_string": "mp4a",
      "codec_tag": "0x6134706d",
      "sample_fmt": "fltp",
      "sample_rate": "48000",
      "channels": 2,
      "bits_per_sample": 0,
      "r_frame_rate": "0/0",
      "avg_frame_rate": "0/0",
      "time_base": "1/48000",
      "start_pts": 0,
      "start_time": "0.000000",
      "duration_ts": 28619776,
      "duration": "596.245333",
      "bit_rate": "159997",
      "nb_frames": "27949",
      "disposition": {
        "default": 0,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0
      },
      "tags": {
        "creation_time": "1970-01-01 00:00:00",
        "language": "und",
        "handler_name": "\fSoundHandler"
      }
    }
  ],
  "format": {
    "filename": "http://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_320x180.mp4",
    "nb_streams": 2,
    "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
    "format_long_name": "QuickTime / MOV",
    "start_time": "0.000000",
    "duration": "596.459000",
    "size": "64657027",
    "bit_rate": "867211",
    "tags": {
      "major_brand": "isom",
      "minor_version": "512",
      "compatible_brands": "mp41",
      "creation_time": "1970-01-01 00:00:00",
      "title": "Big Buck Bunny",
      "artist": "Blender Foundation",
      "composer": "Blender Foundation",
      "date": "2008",
      "encoder": "Lavf52.14.0"
    }
  }
}

音频的 metadata.info 的格式

{
  streams: [
    {
      index: 0,
      codec_name: 'mp3',
      codec_long_name: 'MP3 (MPEG audio layer 3)',
      profile: 'unknown',
      codec_type: 'audio',
      codec_time_base: '1/44100',
      codec_tag_string: '[0][0][0][0]',
      codec_tag: '0x0000',
      sample_fmt: 'fltp',
      sample_rate: 44100,
      channels: 2,
      channel_layout: 'stereo',
      bits_per_sample: 0,
      id: 'N/A',
      r_frame_rate: '0/0',
      avg_frame_rate: '0/0',
      time_base: '1/14112000',
      start_pts: 353600,
      start_time: 0.025057,
      duration_ts: 'N/A',
      duration: 'N/A',
      bit_rate: 128000,
      max_bit_rate: 'N/A',
      bits_per_raw_sample: 'N/A',
      nb_frames: 'N/A',
      nb_read_frames: 'N/A',
      nb_read_packets: 'N/A',
      tags: [Object],
      disposition: [Object]
    },
    {
      index: 1,
      codec_name: 'mjpeg',
      codec_long_name: 'Motion JPEG',
      profile: 'Baseline',
      codec_type: 'video',
      codec_time_base: '0/1',
      codec_tag_string: '[0][0][0][0]',
      codec_tag: '0x0000',
      width: 640,
      height: 640,
      coded_width: 640,
      coded_height: 640,
      closed_captions: 0,
      has_b_frames: 0,
      sample_aspect_ratio: '1:1',
      display_aspect_ratio: '1:1',
      pix_fmt: 'yuvj420p',
      level: '-99',
      color_range: 'pc',
      color_space: 'bt470bg',
      color_transfer: 'unknown',
      color_primaries: 'unknown',
      chroma_location: 'center',
      field_order: 'unknown',
      timecode: 'N/A',
      refs: 1,
      id: 'N/A',
      r_frame_rate: '90000/1',
      avg_frame_rate: '0/0',
      time_base: '1/90000',
      start_pts: 'N/A',
      start_time: 'N/A',
      duration_ts: 'N/A',
      duration: 'N/A',
      bit_rate: 'N/A',
      max_bit_rate: 'N/A',
      bits_per_raw_sample: 8,
      nb_frames: 'N/A',
      nb_read_frames: 'N/A',
      nb_read_packets: 'N/A',
      tags: [Object],
      disposition: [Object]
    }
  ],
  format: {
    filename: 'pipe:0',
    nb_streams: 2,
    nb_programs: 0,
    format_name: 'mp3',
    format_long_name: 'MP2/3 (MPEG audio layer 2/3)',
    start_time: 0.025057,
    duration: 'N/A',
    size: 'N/A',
    bit_rate: 128000,
    probe_score: 51,
    tags: {
      encoder: 'Lavf57.71.100',
      disc: '01',
      track: '1',
      artist: '程书林',
      comment: "163 key(Don't modify):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",
      title: '程书林 - 烤面筋（古风重编曲）（程书林 remix）',
      album: '烤面筋'
    }
  },
  chapters: []
}

图片的 metadata.info 信息:

{
  streams: [
    {
      index: 0,
      codec_name: 'png',
      codec_long_name: 'PNG (Portable Network Graphics) image',
      profile: 'unknown',
      codec_type: 'video',
      codec_time_base: '0/1',
      codec_tag_string: '[0][0][0][0]',
      codec_tag: '0x0000',
      width: 1225,
      height: 924,
      coded_width: 1225,
      coded_height: 924,
      closed_captions: 0,
      has_b_frames: 0,
      sample_aspect_ratio: 'N/A',
      display_aspect_ratio: 'N/A',
      pix_fmt: 'rgba',
      level: '-99',
      color_range: 'pc',
      color_space: 'unknown',
      color_transfer: 'unknown',
      color_primaries: 'unknown',
      chroma_location: 'unspecified',
      field_order: 'unknown',
      timecode: 'N/A',
      refs: 1,
      id: 'N/A',
      r_frame_rate: '25/1',
      avg_frame_rate: '0/0',
      time_base: '1/25',
      start_pts: 'N/A',
      start_time: 'N/A',
      duration_ts: 'N/A',
      duration: 'N/A',
      bit_rate: 'N/A',
      max_bit_rate: 'N/A',
      bits_per_raw_sample: 'N/A',
      nb_frames: 'N/A',
      nb_read_frames: 'N/A',
      nb_read_packets: 'N/A',
      disposition: [Object]
    }
  ],
  format: {
    filename: 'pipe:0',
    nb_streams: 1,
    nb_programs: 0,
    format_name: 'png_pipe',
    format_long_name: 'piped png sequence',
    start_time: 'N/A',
    duration: 'N/A',
    size: 'N/A',
    bit_rate: 'N/A',
    probe_score: 99
  },
  chapters: []
}

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SourceMetadata

使用

方法

事件

matadata 对象