FLAC (.flac)

  • Import and Export support all audio codecs commonly used in the FLAC format.

BackgroundBackground

    MIME type:
    FLAC lossless audio codec.
    Used for audio archiving and playback and for exchanging audio data on the web.
    Open standard for audio compression.
    FLAC is an acronym for Free Lossless Audio Codec.
    Binary file format.
    Compresses audio samples using linear prediction and run-length encoding methods.
    Supports up to eight audio channels.

Import and ExportImport and Export

  • Import["file.flac"] imports a FLAC file, returning an audio object.
  • Import["file.flac",elem] imports the specified element from a FLAC file.
  • The import format can be specified with Import["file","FLAC"] or Import["file",{"FLAC",elem,}].
  • Export["file.flac",expr] exports a sound or an audio object to FLAC.
  • Audio and sound objects are by default exported using an "Integer16" encoding.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the FLAC format.

ElementsElements

  • General Import elements:
  • "Elements"list of elements and options available in this file
    "Rules"full list of rules for each element and option
    "Options"list of rules for options, properties, and settings
  • Data representation elements:
  • "Audio"an Audio object containing all audio samples
    "AudioFile"an Audio object representing the audio stored in the file
    "Data"raw audio samples given as a list of lists of real numbers, each sublist representing an individual audio channel
    "SampledSoundList"data represented as a SampledSoundList object
    "Sound"data represented as a Sound object
  • Import and Export use the "Audio" element by default for FLAC files.
  • Advanced Import element:
  • "AudioChannels"number of audio channels
    "AudioEncoding"how samples are encoded
    "Duration"duration in seconds
    "Length"number of sound samples
    "MetaInformation"meta-information tags, given as a list of rules
    "SampleDepth"bits used to encode amplitude levels
    "SampleRate"number of amplitude samples per second and channel
  • When exporting meta-information only to an existing file, Export will update the meta-information in the file, leaving the audio data unchanged.

OptionsOptions

  • Import and Export option:
  • SampleRateAutomaticnumber of amplitude samples per second for each channel
    "IncludeMetaInformation"Allwhether to include meta-information
  • "AudioChannels"Automaticnumber of audio channels
    "AudioEncoding""Integer16"how samples are encoded
  • If the sample rate is not specified when exporting to FLAC, the highest sample rate occurring in the exported sound is used, and all sounds are resampled as necessary.
  • If the number of channels is unspecified, the highest number of simultaneous channels is taken, and silence is inserted if necessary.
  • If "AudioChannels" is set to a value n that is less than the number of channels to be exported, only the first n channels are exported.
  • "AudioEncoding" can be set to any of the following codecs:
  • "Integer8"unsigned 8-bit PCM
    "Integer16"16-bit PCM
    "Integer24"24-bit PCM

ExamplesExamplesopen allclose all

Basic Examples  (5)Basic Examples  (5)

Import a sample FLAC file:

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Read meta-information from a file:

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Import audio metadata:

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Show all import elements available in this file:

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Use Play to generate sampled sound:

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Export the previous output to FLAC:

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Import and plot the first 150 amplitude samples from the first audio channel:

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Introduced in 2007
(6.0)
| Updated in 2016
(11.0)