fm.freemix.release.stem

lex-publisher.freemix.fm

Documentation

A stem (isolated track component) belonging to a parent track

main record

A stem (isolated track component) belonging to a parent track

Record Key tid Timestamp-based ID

Properties

audioDurationMs integer Required

Duration of the stem in milliseconds

audioFormat string Required

Audio file format

maxLength: 100 bytes
Known values: wav, flac, mp3
audioHash string Required

SHA-256 hash of the stem audio content

maxLength: 200 bytes
audioSizeBytes integer Required

Size of the audio file in bytes

audioUrl string uri Required

R2 URL to the stem audio file

maxLength: 3000 bytes
createdAt string datetime Required

Record creation timestamp

maxLength: 100 bytes
label string Required

Human-readable name (e.g., 'Main Vocal', 'Acid Line', '808 Kit')

maxLength: 100 bytes
parentTrack string at-uri Optional

AT URI of the parent track this stem belongs to (optional for standalone stems)

maxLength: 3000 bytes
parentTrackCid string cid Optional

CID of the parent track record (pins to exact version)

maxLength: 200 bytes
position integer Optional

Display order position (0-indexed)

minimum: 0
stemType string Required

Type/category of the stem

maxLength: 100 bytes
Known values: drums, bass, vocals, synth, guitar, keys, pad, lead, fx, other
View raw schema 
{
  "key": "tid",
  "type": "record",
  "record": {
    "type": "object",
    "required": [
      "stemType",
      "label",
      "audioUrl",
      "audioHash",
      "audioDurationMs",
      "audioFormat",
      "audioSizeBytes",
      "createdAt"
    ],
    "properties": {
      "label": {
        "type": "string",
        "maxLength": 100,
        "description": "Human-readable name (e.g., 'Main Vocal', 'Acid Line', '808 Kit')"
      },
      "audioUrl": {
        "type": "string",
        "format": "uri",
        "maxLength": 3000,
        "description": "R2 URL to the stem audio file"
      },
      "position": {
        "type": "integer",
        "minimum": 0,
        "description": "Display order position (0-indexed)"
      },
      "stemType": {
        "type": "string",
        "maxLength": 100,
        "description": "Type/category of the stem",
        "knownValues": [
          "drums",
          "bass",
          "vocals",
          "synth",
          "guitar",
          "keys",
          "pad",
          "lead",
          "fx",
          "other"
        ]
      },
      "audioHash": {
        "type": "string",
        "maxLength": 200,
        "description": "SHA-256 hash of the stem audio content"
      },
      "createdAt": {
        "type": "string",
        "format": "datetime",
        "maxLength": 100,
        "description": "Record creation timestamp"
      },
      "audioFormat": {
        "type": "string",
        "maxLength": 100,
        "description": "Audio file format",
        "knownValues": [
          "wav",
          "flac",
          "mp3"
        ]
      },
      "parentTrack": {
        "type": "string",
        "format": "at-uri",
        "maxLength": 3000,
        "description": "AT URI of the parent track this stem belongs to (optional for standalone stems)"
      },
      "audioSizeBytes": {
        "type": "integer",
        "description": "Size of the audio file in bytes"
      },
      "parentTrackCid": {
        "type": "string",
        "format": "cid",
        "maxLength": 200,
        "description": "CID of the parent track record (pins to exact version)"
      },
      "audioDurationMs": {
        "type": "integer",
        "description": "Duration of the stem in milliseconds"
      }
    }
  },
  "description": "A stem (isolated track component) belonging to a parent track"
}

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