diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..cdf77af
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "test/samples"]
+	path = test/samples
+	url = https://github.com/foo86/dcadec-samples.git
diff --git a/Makefile b/Makefile
index 4fb214c..5cd1d78 100644
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,10 @@ endif
 OUT_DEC ?= dcadec$(EXESUF)
 OUT_CUT ?= dcacut$(EXESUF)
 
+OUT_DEV ?= test/stddev$(EXESUF)
+SRC_DEV ?= test/stddev.c
+CFLAGS_DEV ?= -O2 -Wall -Wextra
+
 SRC_LIB = \
 libdcadec/bitstream.c \
 libdcadec/core_decoder.c \
@@ -135,11 +139,19 @@ $(OUT_CUT): $(OBJ_CUT) $(OUT_LIB)
 
 endif
 
+$(OUT_DEV): $(SRC_DEV)
+	$(CC) $(LDFLAGS) -o $@ $(CFLAGS_DEV) $< $(LIBS)
+
+check: $(OUT_DEC) $(OUT_DEV)
+	cd test && ./test.sh
+
 clean:
 	$(RM) $(OUT_LIB) $(OBJ_LIB) $(DEP_LIB) $(EXTRA_LIB)
 	$(RM) $(OUT_DEC) $(OBJ_DEC) $(DEP_DEC)
 	$(RM) $(OUT_CUT) $(OBJ_CUT) $(DEP_CUT)
 	$(RM) dcadec.pc
+	$(RM) $(OUT_DEV)
+	$(RM) -r test/decoded
 
 .PHONY: dcadec.pc
 dcadec.pc: dcadec.pc.in
diff --git a/test/checksum.txt b/test/checksum.txt
new file mode 100644
index 0000000..2eccc08
--- /dev/null
+++ b/test/checksum.txt
@@ -0,0 +1,109 @@
+9415e0d4c7cd58ee793d7b2bfae34e4de411181c *decoded/dmix_0/core_51_24_48_768_0.wav
+de10f73b35c2db915f69c46ddc95468c25510bdf *decoded/dmix_0/core_51_24_48_768_1.wav
+aa95c8fac1876cce0750261b26ad231a0249b7b0 *decoded/dmix_0/x96_51_24_96_1509.wav
+684e654a5b3bb3be9e34bfc32af14bac756bb83e *decoded/dmix_0/x96_xch_61_24_96_3840.wav
+fa27196ba43bd24efd319f96fd045f7e5ca0b324 *decoded/dmix_0/x96_xxch_71_24_96_3840.wav
+b64efecbd7b2df7b5edb3dbda7f2b3f715c06eef *decoded/dmix_0/xbr_51_24_48_3840.wav
+346e21a2f26f798808709e4153ea68b6207e377c *decoded/dmix_0/xbr_xch_61_24_48_3840.wav
+eabf815257bba4388e46c3330ee8456d793bb44d *decoded/dmix_0/xbr_xxch_71_24_48_3840.wav
+05529c0991df6e55811b582b263118a62f2ff1e7 *decoded/dmix_0/xch_61_24_48_768.wav
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diff --git a/test/samples b/test/samples
new file mode 160000
index 0000000..fa7dcf8
--- /dev/null
+++ b/test/samples
@@ -0,0 +1 @@
+Subproject commit fa7dcf8c98c6d3b06a7f62d6a2c41bfb0e249390
diff --git a/test/stddev.c b/test/stddev.c
new file mode 100644
index 0000000..4768a31
--- /dev/null
+++ b/test/stddev.c
@@ -0,0 +1,111 @@
+/*
+ * This file is part of libdcadec.
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+
+#define BUF 3000
+#define HDR 44
+
+int main(int argc, char **argv)
+{
+    uint8_t buf1[BUF], buf2[BUF], *p1, *p2;
+    int64_t acc = 0, cnt = 0;
+    size_t r1, r2, i;
+    double ref = 0.0;
+
+    if (argc != 4)
+        goto fail;
+
+    if (strcmp(argv[3], "?")) {
+        char *p;
+        ref = strtod(argv[3], &p);
+        if (*p || p == argv[3])
+            goto fail;
+    }
+
+    FILE *fp1 = fopen(argv[1], "rb");
+    FILE *fp2 = fopen(argv[2], "rb");
+    if (!fp1 || !fp2)
+        goto fail;
+
+    if (fread(buf1, HDR, 1, fp1) != 1 || fread(buf2, HDR, 1, fp2) != 1)
+        goto fail;
+
+    if (memcmp(buf1, buf2, HDR) || memcmp(buf1, "RIFF", 4))
+        goto fail;
+
+    int bps;
+    switch (buf1[34] | (buf1[35] << 8)) {
+    case 16:
+        bps = 2;
+        break;
+    case 24:
+        bps = 3;
+        break;
+    default:
+        goto fail;
+    }
+
+    do {
+        r1 = fread(buf1, 1, BUF, fp1);
+        r2 = fread(buf2, 1, BUF, fp2);
+        if (r1 != r2 || r1 % bps)
+            goto fail;
+
+        for (i = 0, p1 = buf1, p2 = buf2; i < r1 / bps; i++, p1 += bps, p2 += bps) {
+            int64_t d;
+
+            if (bps == 3) {
+                int32_t v1 = ((p1[0] << 8) | (p1[1] << 16) | (p1[2] << 24)) >> 8;
+                int32_t v2 = ((p2[0] << 8) | (p2[1] << 16) | (p2[2] << 24)) >> 8;
+                d = v1 - v2;
+            } else {
+                int16_t v1 = p1[0] | (p1[1] << 8);
+                int16_t v2 = p2[0] | (p2[1] << 8);
+                d = v1 - v2;
+            }
+
+            acc += d * d;
+        }
+
+        cnt += i;
+    } while (r1 == BUF);
+
+    if (!cnt)
+        goto fail;
+
+    double var = (double)acc / cnt;
+    double dev = sqrt(var);
+    if (strcmp(argv[3], "?")) {
+        if (fabs(dev - ref) > 0.1)
+            goto fail;
+        printf("%s: OK\n", argv[1]);
+    } else {
+        printf("%s: %f\n", argv[1], dev);
+    }
+
+    return 0;
+
+fail:
+    printf("%s: FAILED\n", argc > 1 ? argv[1] : "???");
+    return 1;
+}
diff --git a/test/stddev.txt b/test/stddev.txt
new file mode 100644
index 0000000..f956e8f
--- /dev/null
+++ b/test/stddev.txt
@@ -0,0 +1,69 @@
+decoded/mono/core_51_24_48_768_0_C.wav: 2.282641
+decoded/mono/core_51_24_48_768_0_L.wav: 1.783442
+decoded/mono/core_51_24_48_768_0_LFE.wav: 0.000000
+decoded/mono/core_51_24_48_768_0_Ls.wav: 1.780153
+decoded/mono/core_51_24_48_768_0_R.wav: 1.737961
+decoded/mono/core_51_24_48_768_0_Rs.wav: 1.761957
+decoded/mono/core_51_24_48_768_1_C.wav: 2.258123
+decoded/mono/core_51_24_48_768_1_L.wav: 1.828726
+decoded/mono/core_51_24_48_768_1_LFE.wav: 0.000000
+decoded/mono/core_51_24_48_768_1_Ls.wav: 1.727110
+decoded/mono/core_51_24_48_768_1_R.wav: 1.800879
+decoded/mono/core_51_24_48_768_1_Rs.wav: 1.710206
+decoded/mono/x96_51_24_96_1509_C.wav: 3.372648
+decoded/mono/x96_51_24_96_1509_L.wav: 2.959649
+decoded/mono/x96_51_24_96_1509_LFE.wav: 0.549103
+decoded/mono/x96_51_24_96_1509_Ls.wav: 3.121600
+decoded/mono/x96_51_24_96_1509_R.wav: 2.959649
+decoded/mono/x96_51_24_96_1509_Rs.wav: 3.053878
+decoded/mono/x96_xch_61_24_96_3840_C.wav: 3.550590
+decoded/mono/x96_xch_61_24_96_3840_Cs.wav: 2.152851
+decoded/mono/x96_xch_61_24_96_3840_L.wav: 3.175529
+decoded/mono/x96_xch_61_24_96_3840_LFE.wav: 0.549103
+decoded/mono/x96_xch_61_24_96_3840_Ls.wav: 3.565754
+decoded/mono/x96_xch_61_24_96_3840_R.wav: 3.175529
+decoded/mono/x96_xch_61_24_96_3840_Rs.wav: 3.546978
+decoded/mono/x96_xxch_71_24_96_3840_C.wav: 3.431600
+decoded/mono/x96_xxch_71_24_96_3840_L.wav: 3.354502
+decoded/mono/x96_xxch_71_24_96_3840_LFE.wav: 0.875697
+decoded/mono/x96_xxch_71_24_96_3840_Lsr.wav: 2.181241
+decoded/mono/x96_xxch_71_24_96_3840_Lss.wav: 4.218345
+decoded/mono/x96_xxch_71_24_96_3840_R.wav: 3.485461
+decoded/mono/x96_xxch_71_24_96_3840_Rsr.wav: 2.048544
+decoded/mono/x96_xxch_71_24_96_3840_Rss.wav: 3.940506
+decoded/mono/xbr_51_24_48_3840_C.wav: 2.499609
+decoded/mono/xbr_51_24_48_3840_L.wav: 1.944418
+decoded/mono/xbr_51_24_48_3840_LFE.wav: 0.000000
+decoded/mono/xbr_51_24_48_3840_Ls.wav: 2.080297
+decoded/mono/xbr_51_24_48_3840_R.wav: 1.950060
+decoded/mono/xbr_51_24_48_3840_Rs.wav: 2.005242
+decoded/mono/xbr_xch_61_24_48_3840_C.wav: 2.161339
+decoded/mono/xbr_xch_61_24_48_3840_Cs.wav: 1.422133
+decoded/mono/xbr_xch_61_24_48_3840_L.wav: 1.758212
+decoded/mono/xbr_xch_61_24_48_3840_LFE.wav: 0.000000
+decoded/mono/xbr_xch_61_24_48_3840_Ls.wav: 2.442103
+decoded/mono/xbr_xch_61_24_48_3840_R.wav: 1.807914
+decoded/mono/xbr_xch_61_24_48_3840_Rs.wav: 2.365627
+decoded/mono/xbr_xxch_71_24_48_3840_C.wav: 2.798402
+decoded/mono/xbr_xxch_71_24_48_3840_L.wav: 2.057641
+decoded/mono/xbr_xxch_71_24_48_3840_LFE.wav: 0.000000
+decoded/mono/xbr_xxch_71_24_48_3840_Lsr.wav: 1.502439
+decoded/mono/xbr_xxch_71_24_48_3840_Lss.wav: 2.729415
+decoded/mono/xbr_xxch_71_24_48_3840_R.wav: 2.024387
+decoded/mono/xbr_xxch_71_24_48_3840_Rsr.wav: 1.485444
+decoded/mono/xbr_xxch_71_24_48_3840_Rss.wav: 2.797617
+decoded/mono/xch_61_24_48_768_C.wav: 2.111284
+decoded/mono/xch_61_24_48_768_Cs.wav: 1.331705
+decoded/mono/xch_61_24_48_768_L.wav: 1.850623
+decoded/mono/xch_61_24_48_768_LFE.wav: 0.000000
+decoded/mono/xch_61_24_48_768_Ls.wav: 1.999267
+decoded/mono/xch_61_24_48_768_R.wav: 1.850623
+decoded/mono/xch_61_24_48_768_Rs.wav: 2.159644
+decoded/mono/xxch_71_24_48_2046_C.wav: 2.353314
+decoded/mono/xxch_71_24_48_2046_L.wav: 1.915577
+decoded/mono/xxch_71_24_48_2046_LFE.wav: 0.000000
+decoded/mono/xxch_71_24_48_2046_Lsr.wav: 1.260309
+decoded/mono/xxch_71_24_48_2046_Lss.wav: 2.389961
+decoded/mono/xxch_71_24_48_2046_R.wav: 1.915577
+decoded/mono/xxch_71_24_48_2046_Rsr.wav: 1.282964
+decoded/mono/xxch_71_24_48_2046_Rss.wav: 2.442203
diff --git a/test/test.sh b/test/test.sh
new file mode 100755
index 0000000..b394c3c
--- /dev/null
+++ b/test/test.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+set -e
+
+if [ ! -f samples/README ] ; then
+    echo "ERROR: Run 'git submodule update --init test/samples' first."
+    exit 1
+fi
+
+rm -rf decoded
+mkdir -p decoded/dmix_0 decoded/dmix_2 decoded/dmix_6 decoded/mono
+for i in samples/*.dtshd ; do
+    ../dcadec -b -q $i decoded/dmix_0/$(basename $i .dtshd).wav
+    ../dcadec -b -q -2 $i decoded/dmix_2/$(basename $i .dtshd).wav
+    ../dcadec -b -q -6 $i decoded/dmix_6/$(basename $i .dtshd).wav
+    ../dcadec -m -q $i decoded/mono/$(basename $i .dtshd)_%s.wav
+done
+
+if [ "$1" = "--update" ] ; then
+    sha1sum -b decoded/dmix_0/*.wav decoded/dmix_2/*.wav decoded/dmix_6/*.wav > checksum.txt
+    sha1sum -b samples/reference/xll_*.wav | sed 's|samples/reference|decoded/mono|' >> checksum.txt
+    for i in decoded/mono/core_*.wav decoded/mono/x96_*.wav decoded/mono/xbr_*.wav decoded/mono/xch_*.wav decoded/mono/xxch_*.wav ; do
+        ./stddev $i samples/reference/$(basename $i) ?
+    done > stddev.txt
+else
+    sha1sum -c checksum.txt
+    for i in decoded/mono/core_*.wav decoded/mono/x96_*.wav decoded/mono/xbr_*.wav decoded/mono/xch_*.wav decoded/mono/xxch_*.wav ; do
+        ./stddev $i samples/reference/$(basename $i) $(grep -F $i stddev.txt | cut -d ' ' -f 2)
+    done
+fi