scrolling_spectro create videos of single row spectrograms scrolling from right to left sync'ed with sound.

scrolling_spectro(wave, file.name = "scroll.spectro.mp4", hop.size = 11.6, wl = NULL,
ovlp = 70, flim = NULL, pal = seewave::reverse.gray.colors.1, speed = 1, fps = 50,
t.display = 1.5, fix.time = TRUE, res = 70,
width = 700, height = 400, parallel = 1, pb = TRUE,
play = TRUE, loop = 1, lcol = "#07889B99",
lty = 2, lwd = 2, axis.type = "standard", buffer = 1,
ggspectro = FALSE, lower.spectro = TRUE, height.prop = c(5, 1), derivative = FALSE,
osc = FALSE, colwave = "black", colbg = "white",
spectro.call = NULL, annotation.call = NULL, ...)

## Arguments

wave

object of class 'Wave'.

file.name

Character string with the name of the output video file. Must include the .mp4 extension. Default is 'scroll.spectro.mp4'.

hop.size

A numeric vector of length 1 specifying the time window duration (in ms). Default is 11.6 ms, which is equivalent to 512 wl for a 44.1 kHz sampling rate. Ignored if 'wl' is supplied.

wl

A numeric vector of length 1 specifying the window length of the spectrogram, default is NULL. If supplied, 'hop.size' is ignored.

ovlp

Numeric vector of length 1 specifying the percent overlap between two consecutive windows, as in spectro. Default is 70.

flim

A numeric vector of length 2 specifying limits in the frequency axis (in kHz). Default is NULL (which means from 0 to Nyquist frequency).

pal

Character string with the color palette to be used. Default is 'reverse.gray.colors.1'.

speed

Numeric vector of length 1 indicating the speed at which the sound file will be reproduced (default is 1, normal speed). Values < 1 (but higher than 0) slow down while values > 1 speed up. Note that changes in speed are achieved by modifying the number of frames per second in the output video. Hence, you may want to adjust 'fps' if video quality is considerably affected.

fps

Numeric vector of length 1 specifying the number of frames per second.

t.display

Numeric vector of length 1 specifying the time range displayed in the spectrogram.

fix.time

Logical argument to control if the time axis moves along with the spectrogram or remains fixed. Default is TRUE (fixed).

res

Numeric vector of length 1 specifying the resolution of the image files (see png).

width

Numeric vector of length 1 specifying width of the video frame in pixels (see png). Default is 700.

height

Numeric vector of length 1 specifying height of the video frame in pixels (see png). Default is 400.

parallel

Numeric vector of length 1. Controls whether parallel computing is applied by specifying the number of cores to be used. Default is 1 (i.e. no parallel computing).

pb

Logical argument to control if progress bar is shown. Default is TRUE.

play

Logical argument to control if the video is played after generated. Default is TRUE.

loop

Logical argument to control if the video is formatted to be played in a loop (i.e. if ends at the start of the clip).

lcol

Character string with the color to be used for the vertical line at which sounds are played. Default is "#07889B99".

lty

Character string to control the type of the line at which sounds are played. Line types can either be specified as an integer (0=blank, 1=solid (default), 2=dashed, 3=dotted, 4=dotdash, 5=longdash, 6=twodash) or as one of the character strings "blank", "solid", "dashed", "dotted", "dotdash", "longdash", or "twodash", where "blank" uses 'invisible lines' (i.e., does not draw them).Default is 2.

lwd

Character string to control the width of the line at which sounds are played. Default is 2.

axis.type

Character string to control the style of spectrogram axes. Currently there are 3 options:

• standard: Both Y and X axes are printed as in the default spectro view.

• minimal: Single lines are used to denote the range defined by 1 s and 1 kHz for the X and Y axes respectively.

• none: No axis is printed (also removes ticks, tick labels, and axis labels).

buffer

Numeric vector of length 1 (> 0) specifying the time to delay the start of the spectrogram scrolling (in seconds). Default is 1. Not available when loop is > 1.

ggspectro

Logical argument to control if a ggspectro (ggspectro) is used instead. Note that there is much less control on display parameters when ggpsectro = TRUE. Default is FALSE.

lower.spectro

Logical argument to control if a spectrogram of the full wave object is plotted at the bottom of the graph. Default is TRUE.

height.prop

Numeric vector of length 2 to control the relative height of the scrolling and lower spectro, respectively. Default is c(5, 1). Ignored if lower.spectro = FALSE.

derivative

Logical argument to control if spectral derivative is used instead of spectrogram (as in Sound Analysis Pro, see deriche). Default is FALSE.

osc

Logical argument to control if the oscillogram is plotted at the bottom of the spectrogram. Default is FALSE. Note that 'osc' and 'lower.spectro' are mutually exclusive.

colwave

Character string to control the color of the oscillogram. Default is 'black'.

colbg

Character string to control the background color. Default is 'white'.

spectro.call

A call from a spectrogram creating function (i.e. spectro, color_spectro) generated by the function call. This call will replace the internal spectrogram creating call. Default is NULL.

annotation.call

A call from text generated by the function call. The call should also include the argmuents 'start' and 'end' to indicate the time at which the labels are displayed (in s).'fading' is optional and allows fade-in and fade-out effects on labels (in s as well). The position ('x' and 'y' arguments) should be between 0 and 1: x = 0, y = 0 corresponds to the bottom left and x = 1, y = 1 corresponds to the top right position.

...

Additional arguments to be passed to spectro for customizing spectrograms. Note that 'scale' cannot be included.

## Value

A video file in mp4 format in the working directory with the scrolling spectrogram.

## Details

The function creates videos (mp4 format) of single row spectrograms scrolling from right to left. The audio is sync'ed with the spectrograms.

## References

Araya-Salas M & Wilkins M R. (2020). dynaSpec: dynamic spectrogram visualizations in R. R package version 1.0.0.

spectro

## Author

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

## Examples

if (FALSE) {