Splits sound files and associated annotations

split_acoustic_data splits sound files (and corresponding selection tables) in shorter segments

Usage

split_acoustic_data(path = ".", sgmt.dur = 10, sgmts = NULL, files = NULL,
 cores = 1, pb = TRUE, only.sels = FALSE, X = NULL)

Arguments

path

Directory path where sound files are found. The current working directory is used as default.

sgmt.dur

Numeric. Duration (in s) of segments in which sound files would be split. Sound files shorter than 'sgmt.dur' won't be split. Ignored if 'sgmts' is supplied.

sgmts

Numeric. Number of segments in which to split each sound file. If supplied 'sgmt.dur' is ignored.

files

Character vector indicating the subset of files that will be split. Supported file formats:'.wav', '.mp3', '.flac' and '.wac'. If not supplied the function will work on all sound files (in the supported format) in 'path'.

cores

Numeric. Controls whether parallel computing is applied. It specifies the number of cores to be used. Default is 1 (i.e. no parallel computing).

pb

Logical argument to control progress bar. Default is TRUE. Only used when

only.sels

Logical argument to control if only the data frame is returned (no wave files are saved). Default is FALSE.

X

'selection_table' object or a data frame with columns for sound file name (sound.files), selection number (selec), and start and end time of signal (start and end). If supplied the data frame/selection table is modified to reflect the position of the selections in the new sound files. Note that some selections could split between 2 segments. To deal with this, a 'split.sels' column is added to the data frame in which those selection are labeled as 'split'. Default is NULL.

Value

Wave files for each segment in the working directory (if only.sels = FALSE, named as 'sound.file.name-#.wav') and a data frame in the R environment containing the name of the original sound files (original.sound.files), the name of the clips (sound.files) and the start and end of clips in the original files. Clips are saved in .wav format. If 'X' is supplied then a data frame with the position of the selections in the newly created clips is returned instead. In this case the output data frame contains an additional column, 'split.sels', that inform users whether selections have been split into multiple clips ('split') or not (NA). Sound files in 'path' that are not referenced in 'X' will stil be split.

Details

This function aims to reduce the size of sound files in order to simplify some processes that are limited by sound file size (big files can be manipulated, e.g. energy_detector).

References

Araya-Salas, M., Smith-Vidaurre, G., Chaverri, G., Brenes, J. C., Chirino, F., Elizondo-Calvo, J., & Rico-Guevara, A. 2022. ohun: an R package for diagnosing and optimizing automatic sound event detection. BioRxiv, 2022.12.13.520253. https://doi.org/10.1101/2022.12.13.520253

See also

cut_sels

Author

Marcelo Araya-Salas (marcelo.araya@ucr.ac.cr)

Examples

{
  # load data and save to temporary working directory
  data("lbh1", "lbh2")
  tuneR::writeWave(lbh1, file.path(tempdir(), "lbh1.wav"))
  tuneR::writeWave(lbh2, file.path(tempdir(), "lbh2.wav"))

  # split files in 1 s files
  split_acoustic_data(sgmt.dur = 1, path = tempdir())

  # Check this folder
  tempdir()
}
#> [1] "/tmp/Rtmpc1ERJx"