warbleR (version 1.1.26)

read_sound_file: A extended version of read_wave that reads several sound file formats and files from selection tables

Description

read_sound_file is a extended version of read_wave that reads several sound file formats as well as files listed within selection tables

Usage

read_sound_file(X, index, from = X$start[index], to = X$end[index], channel = NULL, 
header = FALSE, path = NULL)

Arguments

X

'data.frame', 'selection_table' or 'extended_selection_table' containing columns for sound file name (sound.files), selection number (selec), and start and end time of signals (start and end). Alternatively, the name of a sound file or URL address to sound file can be provided. The function can read sound files in 'mp3', 'wav' and 'wac' format. The file name can contain the directory path. 'top.freq' and 'bottom.freq' columns are optional. Default is NULL.

index

Index of the selection in 'X' that will be read. Ignored if 'X' is NULL.

from

Where to start reading, in seconds. Default is X$start[index].

to

Where to stop reading, in seconds. Default is X$end[index].

channel

Channel to be read from sound file (1 = left, 2 = right, or higher number for multichannel waves). If NULL or higher than the number of channels in a wave then the first channel is used.

header

If TRUE, only the header information of the Wave object is returned, otherwise (the default) the whole Wave object.

path

Character string containing the directory path where the sound files are located. If NULL (default) then the current working directory is used. If 'X' refers to a sound file including its directory 'path' is ignored.

Value

An object of class "Wave".

Details

The function is a wrapper for readWave that read sound files listed within selection tables. It is also used internally by warbleR functions to read wave objects from extended selection tables (see selection_table for details).

References

Araya-Salas, M., & Smith-Vidaurre, G. (2017). warbleR: An R package to streamline analysis of animal acoustic signals. Methods in Ecology and Evolution, 8(2), 184-191.

Examples

# NOT RUN {
# write wave files with lower case file extension
data(list = c("Phae.long1"))
writeWave(Phae.long1, file.path(tempdir(), "Phae.long1.wav"))

# read from selection table
read_sound_file(X = lbh_selec_table, index  =  1, path = tempdir())

# from extended selection table
library(NatureSounds)
read_sound_file(X = lbh.est, index = 1)

# read from selection table
read_sound_file(X = lbh_selec_table, index  =  1, path = tempdir())
  
# read WAV
filepath <- system.file("extdata", "recording.wav", package = "bioacoustics")
read_sound_file(filepath)

# read MP3
filepath <- system.file("extdata", "recording.mp3", package = "bioacoustics")
read_sound_file(filepath)

# read WAC
filepath <- system.file("extdata", "recording_20170716_230503.wac", package = "bioacoustics")
read_sound_file(filepath, from = 0, to = 0.2)

# URL file
read_sound_file(X = 'https://www.xeno-canto.org/513948/download')
# }
# NOT RUN {
# }