test/test_compression.sh

#!/bin/sh -e

#  FLAC - Free Lossless Audio Codec
#  Copyright (C) 2012-2022  Xiph.Org Foundation
#
#  This file is part the FLAC project.  FLAC is comprised of several
#  components distributed under different licenses.  The codec libraries
#  are distributed under Xiph.Org's BSD-like license (see the file
#  COPYING.Xiph in this distribution).  All other programs, libraries, and
#  plugins are distributed under the GPL (see COPYING.GPL).  The documentation
#  is distributed under the Gnu FDL (see COPYING.FDL).  Each file in the
#  FLAC distribution contains at the top the terms under which it may be
#  distributed.
#
#  Since this particular file is relevant to all components of FLAC,
#  it may be distributed under the Xiph.Org license, which is the least
#  restrictive of those mentioned above.  See the file COPYING.Xiph in this
#  distribution.

. ./common.sh

PATH="$(pwd)/../src/flac:$PATH"

printf "Using FLAC binary : %s\n" "$(which flac)"

date="$(date "+%Y%m%dT%H%M%S")"
fname="comp${date}.flac"

last_k=0
last_size=$(wc -c < noisy-sine.wav)

echo "Original file size ${last_size} bytes."

for k in 0 1 2 3 4 5 6 7 8 ; do
	flac${EXE} -${k} --silent noisy-sine.wav -o ${fname}
	size=$(wc -c < ${fname})
	echo "Compression level ${k}, file size ${size} bytes."
	if test ${last_size} -lt ${size} ; then
		echo "Error : Compression ${last_k} size ${last_size} >= compression ${k} size ${size}."
		exit 1
		fi
	# Need this because OSX's 'wc -c' returns a number with leading whitespace.
	last_size=$((size+10))
	last_k=${k}
	rm -f ${fname}
	done