{
  "version": 1,
  "verifiedAt": "2026-09-19",
  "description": "Licensed field-recording layers for the cafe sound engine. These recordings are not claimed to have been made in Taipei. The engine loads these bundled files from the same origin, not from a third-party streaming service.",
  "processingTool": "FFmpeg with libmp3lame",
  "measurement": "Measured on decoded final MP3 files using FFmpeg ebur128 (integrated loudness / true peak) and astats (full-file RMS). Codec delay is excluded by the MP3 gapless metadata. No listening-quality claim is made by these numerical checks.",
  "assets": [
    {
      "file": "cafe-room.mp3",
      "role": "Stereo cafe room bed with conversation, tableware and espresso activity",
      "title": "Cafe ambient sound.mp3",
      "creator": "evsecrets",
      "publishedAt": "2016-01-03",
      "sourcePage": "https://freesound.org/people/evsecrets/sounds/332271/",
      "downloadUrl": "https://cdn.freesound.org/previews/332/332271_2367065-hq.mp3",
      "sourceVariant": "Publicly accessible HQ preview, as linked by the original Freesound page; not the login-gated original download",
      "recordingProvenance": "The author describes an in-person recording with the Tascam DR-40's built-in stereo microphones.",
      "license": "CC0-1.0",
      "licenseUrl": "https://creativecommons.org/publicdomain/zero/1.0/",
      "licenseEvidence": "The original sound page lists Creative Commons 0 and the author explicitly dedicates this recording to the public domain.",
      "processing": {
        "excerptStartSeconds": 0,
        "excerptDurationSeconds": 90,
        "filter": "highpass=f=45,loudnorm=I=-21:TP=-4:LRA=9:measured_I=-53.17:measured_TP=-29.78:measured_LRA=6.00:measured_thresh=-63.17:offset=-0.45:linear=false,volume=-0.8dB,afade=t=in:d=0.03,afade=t=out:st=89.97:d=0.03",
        "notes": "The raw preview is unusually quiet. Two-pass loudness normalization makes the recorded scene usable, with additional output headroom for MP3 encoding. Long-loop crossfades are handled by the engine. Source text metadata is removed."
      },
      "format": { "codec": "mp3", "sampleRate": 44100, "channels": 2, "bitRate": 160000, "durationSeconds": 90, "bytes": 1801448 },
      "measured": { "integratedLUFS": -22.2, "truePeakDBTP": -4.8, "rmsDBFS": -25.36, "loudnessRangeLU": 5.2 }
    },
    {
      "file": "cafe-cutlery.mp3",
      "role": "Short natural cutlery-on-table event",
      "title": "Cutlery on table.ogg",
      "creator": "thore",
      "sourcePage": "https://commons.wikimedia.org/wiki/File:Cutlery_on_table.ogg",
      "sourceRevision": "https://commons.wikimedia.org/w/index.php?title=File:Cutlery_on_table.ogg&oldid=872238703",
      "downloadUrl": "https://upload.wikimedia.org/wikipedia/commons/8/87/Cutlery_on_table.ogg",
      "recordingProvenance": "Originally distributed through PDSounds; subsequently transferred to Wikimedia Commons.",
      "license": "Public domain — released by the author (PD-author); not a CC0-labelled file",
      "licenseUrl": "https://commons.wikimedia.org/wiki/File:Cutlery_on_table.ogg#Licensing",
      "licenseEvidence": "The file page identifies thore as the author and records an author public-domain release, with an unrestricted-use grant where public-domain release is not legally possible.",
      "processing": {
        "filter": "highpass=f=80,volume=-5.5dB,afade=t=in:d=0.015,afade=t=out:st=4.70:d=0.13",
        "notes": "Full event retained; fixed attenuation preserves transient dynamics. Source text metadata is removed."
      },
      "format": { "codec": "mp3", "sampleRate": 44100, "channels": 2, "bitRate": 160000, "durationSeconds": 4.832653, "bytes": 97742 },
      "measured": { "integratedLUFS": -26.1, "truePeakDBTP": -5.9, "rmsDBFS": -35.29, "loudnessRangeLU": 4.3 }
    },
    {
      "file": "cafe-espresso.mp3",
      "role": "Natural espresso preparation event",
      "title": "Espresso machine.ogg",
      "creator": "hugh",
      "sourcePage": "https://commons.wikimedia.org/wiki/File:Espresso_machine.ogg",
      "sourceRevision": "https://commons.wikimedia.org/w/index.php?title=File:Espresso_machine.ogg&oldid=899894954",
      "downloadUrl": "https://upload.wikimedia.org/wikipedia/commons/d/d7/Espresso_machine.ogg",
      "recordingProvenance": "The original description identifies a Breville machine preparing a double espresso. Originally distributed through PDSounds; subsequently transferred to Wikimedia Commons.",
      "license": "Public domain — released by the author (PD-author); not a CC0-labelled file",
      "licenseUrl": "https://commons.wikimedia.org/wiki/File:Espresso_machine.ogg#Licensing",
      "licenseEvidence": "The file page identifies hugh as the author and records an author public-domain release, with an unrestricted-use grant where public-domain release is not legally possible.",
      "processing": {
        "filter": "highpass=f=55,volume=8dB,afade=t=in:d=0.1,afade=t=out:st=29.45:d=0.38",
        "notes": "Full event retained; fixed gain preserves the natural machine sequence. Mono source is preserved, with spatial placement performed by the engine. Source text metadata is removed."
      },
      "format": { "codec": "mp3", "sampleRate": 44100, "channels": 1, "bitRate": 128000, "durationSeconds": 29.831837, "bytes": 478188 },
      "measured": { "integratedLUFS": -26.7, "truePeakDBTP": -10.4, "rmsDBFS": -29.88, "loudnessRangeLU": 4.5 }
    }
  ]
}