Nothing
##' calculate cepstral coefficients using libassp
##'
##' Short-term cepstral analysis of the signal in <listOfFiles>
##' using the Fast Fourier Transform. The number of
##' coefficients per output record will also equal the
##' FFT length / 2 + 1 (i.e. be non-mirrored).
##' Analysis results will be written to a file with the
##' base name of the input file and as extension '.cep'.
##' Default output is in SSFF format with
##' 'cep' as track name.
##' @title cepstrum
##' @param listOfFiles vector of file paths to be processed by function
##' @param optLogFilePath path to option log file
##' @param beginTime = <time>: set begin of analysis interval to <time> seconds
##' (default: begin of data)
##' @param centerTime = <time>: set single-frame analysis with the analysis
##' window centred at <time> seconds; overrules beginTime, endTime and
##' windowShift options
##' @param endTime = <time>: set end of analysis interval to <time> seconds
##' (default: end of data)
##' @param resolution = <freq>: set FFT length to the smallest value which
##' results in a frequency resolution of <freq> Hz or better (default: 40.0)
##' @param fftLength = <num>: set FFT length to <num> points (overrules default
##' and 'resolution' option)
##' @param windowShift = <dur>: set analysis window shift to <dur> ms
##' (default: 5.0)
##' @param window = <type>: set analysis window function to <type> (default:
##' BLACKMAN)
##' @param toFile write results to file (default extension depends on )
##' @param explicitExt set if you wish to override the default extension
##' @param outputDirectory directory in which output files are stored. Defaults to NULL, i.e.
##' the directory of the input files
##' @param forceToLog is set by the global package variable useWrasspLogger. This is set
##' to FALSE by default and should be set to TRUE is logging is desired.
##' @param verbose display infos & show progress bar
##' @return nrOfProcessedFiles or if only one file to process return
##' AsspDataObj of that file
##' @author Raphael Winkelmann
##' @author Lasse Bombien
##' @seealso \code{\link{dftSpectrum}}, \code{\link{cssSpectrum}}, \code{\link{lpsSpectrum}};
##' all derived from libassp's spectrum function
##' @useDynLib wrassp, .registration = TRUE
##' @examples
##' # get path to audio file
##' path2wav <- list.files(system.file("extdata", package = "wrassp"),
##' pattern = glob2rx("*.wav"),
##' full.names = TRUE)[1]
##'
##' # calulate cepstrum
##' res <- cepstrum(path2wav, toFile=FALSE)
##'
##' # plot cepstral values at midpoint of signal
##' plot(res$cep[dim(res$cep)[1]/2,],
##' type='l',
##' xlab='cepstral value index',
##' ylab='cepstral value')
##'
##' @export
'cepstrum' <- function(listOfFiles = NULL, optLogFilePath = NULL,
beginTime = 0.0, centerTime = FALSE,
endTime = 0.0, resolution = 40.0,
fftLength = 0, windowShift = 5.0,
window = 'BLACKMAN', toFile = TRUE,
explicitExt = NULL, outputDirectory = NULL,
forceToLog = useWrasspLogger, verbose = TRUE){
## ########################
## a few parameter checks and expand paths
if (is.null(listOfFiles)) {
stop(paste("listOfFiles is NULL! It has to be a string or vector of file",
"paths (min length = 1) pointing to valid file(s) to perform",
"the given analysis function."))
}
if (is.null(optLogFilePath) && forceToLog){
stop("optLogFilePath is NULL! -> not logging!")
}else{
if(forceToLog){
optLogFilePath = path.expand(optLogFilePath)
}
}
if(!isAsspWindowType(window)){
stop("WindowFunction of type '", window,"' is not supported!")
}
if (!is.null(outputDirectory)) {
outputDirectory = normalizePath(path.expand(outputDirectory))
finfo <- file.info(outputDirectory)
if (is.na(finfo$isdir))
if (!dir.create(outputDirectory, recursive=TRUE))
stop('Unable to create output directory.')
else if (!finfo$isdir)
stop(paste(outputDirectory, 'exists but is not a directory.'))
}
###########################
# Pre-process file list
listOfFiles <- prepareFiles(listOfFiles)
## #######################
## perform analysis
if(length(listOfFiles)==1 | !verbose){
pb <- NULL
}else{
if(toFile==FALSE){
stop("length(listOfFiles) is > 1 and toFile=FALSE! toFile=FALSE only permitted for single files.")
}
cat('\n INFO: applying cepstrum to', length(listOfFiles), 'files\n')
pb <- utils::txtProgressBar(min = 0, max = length(listOfFiles), style = 3)
}
externalRes = invisible(.External("performAssp", listOfFiles,
fname = "spectrum", beginTime = beginTime,
centerTime = centerTime, endTime = endTime,
spectrumType = 'CEP',
resolution = resolution,
fftLength = as.integer(fftLength),
windowShift = windowShift, window = window,
toFile = toFile, explicitExt = explicitExt,
progressBar = pb, outputDirectory = outputDirectory,
PACKAGE = "wrassp"))
## #########################
## write options to options log file
if (forceToLog){
optionsGivenAsArgs = as.list(match.call(expand.dots = TRUE))
wrassp.logger(optionsGivenAsArgs[[1]], optionsGivenAsArgs[-1],
optLogFilePath, listOfFiles)
}
## #########################
## return dataObj if length only one file
if(!is.null(pb)){
close(pb)
}else{
return(externalRes)
}
}
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