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##' zcrana function adapted from libassp
##'
##' Analysis of the averages of the short-term positive and
##' negative zero-crossing rates of the signal in <listOfFiles>.
##' Analysis results will be written to a file with the
##' base name of the input file and extension '.zcr'.
##' Default output is in SSFF binary format (track 'zcr').
##' @title zcrana
##' @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 file)
##' @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 file)
##' @param windowShift = <dur>: set analysis window shift to <dur> ms (default: 5.0)
##' @param windowSize = <dur>: set analysis window size to <dur> ms (default: 25.0)
##' @param toFile write results to file (default extension is .zcr)
##' @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
##' @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]
##'
##' # calculate zcr values
##' res <- zcrana(path2wav, toFile=FALSE)
##'
##' # plot zcr values
##' plot(seq(0,numRecs.AsspDataObj(res) - 1) / rate.AsspDataObj(res) +
##' attr(res, 'startTime'),
##' res$zcr,
##' type='l',
##' xlab='time (s)',
##' ylab='ZCR values')
##'
##' @export
'zcrana' <- function(listOfFiles = NULL, optLogFilePath = NULL,
beginTime = 0.0, centerTime = FALSE,
endTime = 0.0, windowShift = 5.0,
windowSize = 25.0, toFile = TRUE,
explicitExt = NULL, outputDirectory = NULL,
forceToLog = useWrasspLogger, verbose = TRUE){
###########################
# a few parameter checks and expand paths
if (is.null(listOfFiles)) {
stop(paste("listOfFiles is NULL! It has to be a string or vector of file",
"paths (min length = 1) pointing to valid file(s) to perform",
"the given analysis function."))
}
if (is.null(optLogFilePath) && forceToLog){
stop("optLogFilePath is NULL! -> not logging!")
}else{
if(forceToLog){
optLogFilePath = path.expand(optLogFilePath)
}
}
if (!is.null(outputDirectory)) {
outputDirectory = normalizePath(path.expand(outputDirectory))
finfo <- file.info(outputDirectory)
if (is.na(finfo$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 zcrana to', length(listOfFiles), 'files\n')
pb <- utils::txtProgressBar(min = 0, max = length(listOfFiles), style = 3)
}
externalRes = invisible(.External("performAssp", PACKAGE = "wrassp",
listOfFiles, fname = "zcrana",
beginTime = beginTime, centerTime = centerTime,
endTime = endTime, windowShift = windowShift,
windowSize = windowSize,
toFile = toFile, explicitExt = explicitExt,
outputDirectory = outputDirectory, progressBar = pb))
############################
# 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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