Add a regresion test for compression levels.

src/test_streams/main.c

@@ -869,6 +869,51 @@ foo:
 	return false;
 }
 
+static FLAC__bool generate_noisy_sine(void)
+{
+	FILE *f;
+	FLAC__byte wav[] = {
+		'R', 'I', 'F', 'F',  76,   0,   0,   0,
+		'W', 'A', 'V', 'E', 'f', 'm', 't', ' ',
+		 16,   0,   0,   0,   1,   0,   1,   0,
+		0x44,0xAC,  0,   0,0x88,0x58,0x01,   0,
+		  2,   0,  16,   0, 'd', 'a', 't', 'a',
+		0xa8,   0xba,   0x6,   0
+	};
+	int32_t randstate = 0x1243456;
+	double sample, last_val = 0.0;
+	int k;
+
+	if(0 == (f = fopen("noisy-sine.wav", "wb")))
+		return false;
+	if(fwrite(wav, 1, sizeof (wav), f) < sizeof (wav))
+		goto foo;
+
+	for (k = 0 ; k < 5 * 44100 ; k++) {
+		/* Obvioulsy not a crypto quality RNG. */
+		randstate = 11117 * randstate + 211231;
+		randstate = 11117 * randstate + 211231;
+		randstate = 11117 * randstate + 211231;
+
+		sample = randstate / (0x7fffffff * 1.000001);
+		sample = 0.2 * sample - 0.9 * last_val;
+
+		last_val = sample;
+
+		sample += sin (2.0 * k * M_PI * 1.0 / 32.0);
+		sample *= 0.4;
+
+		write_little_endian_int16(f, lrintf(sample * 32700.0));
+	};
+
+	fclose(f);
+
+	return true;
+foo:
+	fclose(f);
+	return false;
+}
+
 static FLAC__bool generate_wackywav64s(void)
 {
 	FILE *f;
@@ -1078,6 +1123,7 @@ int main(int argc, char *argv[])
 	if(!generate_wackywavs()) return 1;
 	if(!generate_wackywav64s()) return 1;
 	if(!generate_wackyrf64s()) return 1;
+	if(!generate_noisy_sine()) return 1;
 	for(channels = 1; channels <= 8; channels *= 2) {
 		unsigned bits_per_sample;
 		for(bits_per_sample = 8; bits_per_sample <= 24; bits_per_sample += 4) {

test/Makefile.am

@@ -26,7 +26,8 @@ check_SCRIPTS = \
 	test_flac.sh \
 	test_metaflac.sh \
 	test_seeking.sh \
-	test_streams.sh
+	test_streams.sh \
+	test_compression.sh
 
 # This one should pass when building out-of-tree (eg 'make distcheck').
 check: $(check_SCRIPTS)
@@ -36,6 +37,7 @@ if FLaC__WITH_CPPLIBS
 endif
 	$(srcdir)/test_seeking.sh
 	$(srcdir)/test_streams.sh
+	$(srcdir)/test_compression.sh
 	@echo "----------------"
 	@echo "All tests passed"
 	@echo "----------------"
@@ -53,6 +55,7 @@ endif
 	./test_metaflac.sh
 	./test_seeking.sh
 	./test_streams.sh
+	./test_compression.sh
 	@echo "----------------"
 	@echo "All tests passed"
 	@echo "----------------"

test/test_compression.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+#  FLAC - Free Lossless Audio Codec
+#  Copyright (C) 2012  Xiph.Org Foundation
+#
+#  This file is part the FLAC project.  FLAC is comprised of several
+#  components distributed under difference 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.
+
+LD_LIBRARY_PATH=`pwd`/../src/libFLAC/.libs:$LD_LIBRARY_PATH
+LD_LIBRARY_PATH=`pwd`/../src/share/grabbag/.libs:$LD_LIBRARY_PATH
+LD_LIBRARY_PATH=`pwd`/../src/share/getopt/.libs:$LD_LIBRARY_PATH
+LD_LIBRARY_PATH=`pwd`/../src/share/replaygain_analysis/.libs:$LD_LIBRARY_PATH
+LD_LIBRARY_PATH=`pwd`/../src/share/replaygain_synthesis/.libs:$LD_LIBRARY_PATH
+LD_LIBRARY_PATH=`pwd`/../src/share/utf8/.libs:$LD_LIBRARY_PATH
+LD_LIBRARY_PATH=`pwd`/../obj/$BUILD/lib:$LD_LIBRARY_PATH
+export LD_LIBRARY_PATH
+PATH=`pwd`/../src/flac:$PATH
+
+echo "Using FLAC binary :" `which flac`
+
+date=`date "+%Y%m%dT%H%M%S"`
+fname="comp${date}.flac"
+
+last_size=0
+last_k=0
+for k in `seq 1 8` ; do
+	flac -${k} --silent noisy-sine.wav -o ${fname}
+	size=`stat --format="%s" ${fname}`
+	echo "Compression level ${k}, file size ${size} bytes."
+	if test $k -gt 1 ; then
+		if test $last_size -lt $size ; then
+			echo "Error : Compression $last_k size $last_size >= compression $k size $size."
+			exit 1
+			fi
+		fi
+	last_size=$size
+	last_k=$k
+	rm -f $fname
+	done