* #30460: added opus dep
diff --git a/jni/libopus/celt/tests/test_unit_dft.c b/jni/libopus/celt/tests/test_unit_dft.c
new file mode 100644
index 0000000..7ff0be0
--- /dev/null
+++ b/jni/libopus/celt/tests/test_unit_dft.c
@@ -0,0 +1,164 @@
+/* Copyright (c) 2008 Xiph.Org Foundation
+ Written by Jean-Marc Valin */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define SKIP_CONFIG_H
+
+#ifndef CUSTOM_MODES
+#define CUSTOM_MODES
+#endif
+
+#include <stdio.h>
+
+#define CELT_C
+#include "stack_alloc.h"
+#include "kiss_fft.h"
+#include "kiss_fft.c"
+#include "mathops.c"
+#include "entcode.c"
+
+
+#ifndef M_PI
+#define M_PI 3.141592653
+#endif
+
+int ret = 0;
+
+void check(kiss_fft_cpx * in,kiss_fft_cpx * out,int nfft,int isinverse)
+{
+ int bin,k;
+ double errpow=0,sigpow=0, snr;
+
+ for (bin=0;bin<nfft;++bin) {
+ double ansr = 0;
+ double ansi = 0;
+ double difr;
+ double difi;
+
+ for (k=0;k<nfft;++k) {
+ double phase = -2*M_PI*bin*k/nfft;
+ double re = cos(phase);
+ double im = sin(phase);
+ if (isinverse)
+ im = -im;
+
+ if (!isinverse)
+ {
+ re /= nfft;
+ im /= nfft;
+ }
+
+ ansr += in[k].r * re - in[k].i * im;
+ ansi += in[k].r * im + in[k].i * re;
+ }
+ /*printf ("%d %d ", (int)ansr, (int)ansi);*/
+ difr = ansr - out[bin].r;
+ difi = ansi - out[bin].i;
+ errpow += difr*difr + difi*difi;
+ sigpow += ansr*ansr+ansi*ansi;
+ }
+ snr = 10*log10(sigpow/errpow);
+ printf("nfft=%d inverse=%d,snr = %f\n",nfft,isinverse,snr );
+ if (snr<60) {
+ printf( "** poor snr: %f ** \n", snr);
+ ret = 1;
+ }
+}
+
+void test1d(int nfft,int isinverse)
+{
+ size_t buflen = sizeof(kiss_fft_cpx)*nfft;
+
+ kiss_fft_cpx * in = (kiss_fft_cpx*)malloc(buflen);
+ kiss_fft_cpx * out= (kiss_fft_cpx*)malloc(buflen);
+ kiss_fft_state *cfg = opus_fft_alloc(nfft,0,0);
+ int k;
+
+ for (k=0;k<nfft;++k) {
+ in[k].r = (rand() % 32767) - 16384;
+ in[k].i = (rand() % 32767) - 16384;
+ }
+
+ for (k=0;k<nfft;++k) {
+ in[k].r *= 32768;
+ in[k].i *= 32768;
+ }
+
+ if (isinverse)
+ {
+ for (k=0;k<nfft;++k) {
+ in[k].r /= nfft;
+ in[k].i /= nfft;
+ }
+ }
+
+ /*for (k=0;k<nfft;++k) printf("%d %d ", in[k].r, in[k].i);printf("\n");*/
+
+ if (isinverse)
+ opus_ifft(cfg,in,out);
+ else
+ opus_fft(cfg,in,out);
+
+ /*for (k=0;k<nfft;++k) printf("%d %d ", out[k].r, out[k].i);printf("\n");*/
+
+ check(in,out,nfft,isinverse);
+
+ free(in);
+ free(out);
+ free(cfg);
+}
+
+int main(int argc,char ** argv)
+{
+ ALLOC_STACK;
+ if (argc>1) {
+ int k;
+ for (k=1;k<argc;++k) {
+ test1d(atoi(argv[k]),0);
+ test1d(atoi(argv[k]),1);
+ }
+ }else{
+ test1d(32,0);
+ test1d(32,1);
+ test1d(128,0);
+ test1d(128,1);
+ test1d(256,0);
+ test1d(256,1);
+#ifndef RADIX_TWO_ONLY
+ test1d(36,0);
+ test1d(36,1);
+ test1d(50,0);
+ test1d(50,1);
+ test1d(120,0);
+ test1d(120,1);
+#endif
+ }
+ return ret;
+}