Chris@69: /* Copyright (c) 2008-2011 Xiph.Org Foundation
Chris@69:    Written by Jean-Marc Valin */
Chris@69: /*
Chris@69:    Redistribution and use in source and binary forms, with or without
Chris@69:    modification, are permitted provided that the following conditions
Chris@69:    are met:
Chris@69: 
Chris@69:    - Redistributions of source code must retain the above copyright
Chris@69:    notice, this list of conditions and the following disclaimer.
Chris@69: 
Chris@69:    - Redistributions in binary form must reproduce the above copyright
Chris@69:    notice, this list of conditions and the following disclaimer in the
Chris@69:    documentation and/or other materials provided with the distribution.
Chris@69: 
Chris@69:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
Chris@69:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
Chris@69:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
Chris@69:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
Chris@69:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Chris@69:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
Chris@69:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
Chris@69:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
Chris@69:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
Chris@69:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Chris@69:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Chris@69: */
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: #ifndef CUSTOM_MODES
Chris@69: #define CUSTOM_MODES
Chris@69: #endif
Chris@69: 
Chris@69: #include <stdio.h>
Chris@69: #include <stdlib.h>
Chris@69: #include "vq.h"
Chris@69: #include "bands.h"
Chris@69: #include "stack_alloc.h"
Chris@69: #include <math.h>
Chris@69: 
Chris@69: 
Chris@69: #define MAX_SIZE 100
Chris@69: 
Chris@69: int ret=0;
Chris@69: void test_rotation(int N, int K)
Chris@69: {
Chris@69:    int i;
Chris@69:    double err = 0, ener = 0, snr, snr0;
Chris@69:    opus_val16 x0[MAX_SIZE];
Chris@69:    opus_val16 x1[MAX_SIZE];
Chris@69:    for (i=0;i<N;i++)
Chris@69:       x1[i] = x0[i] = rand()%32767-16384;
Chris@69:    exp_rotation(x1, N, 1, 1, K, SPREAD_NORMAL);
Chris@69:    for (i=0;i<N;i++)
Chris@69:    {
Chris@69:       err += (x0[i]-(double)x1[i])*(x0[i]-(double)x1[i]);
Chris@69:       ener += x0[i]*(double)x0[i];
Chris@69:    }
Chris@69:    snr0 = 20*log10(ener/err);
Chris@69:    err = ener = 0;
Chris@69:    exp_rotation(x1, N, -1, 1, K, SPREAD_NORMAL);
Chris@69:    for (i=0;i<N;i++)
Chris@69:    {
Chris@69:       err += (x0[i]-(double)x1[i])*(x0[i]-(double)x1[i]);
Chris@69:       ener += x0[i]*(double)x0[i];
Chris@69:    }
Chris@69:    snr = 20*log10(ener/err);
Chris@69:    printf ("SNR for size %d (%d pulses) is %f (was %f without inverse)\n", N, K, snr, snr0);
Chris@69:    if (snr < 60 || snr0 > 20)
Chris@69:    {
Chris@69:       fprintf(stderr, "FAIL!\n");
Chris@69:       ret = 1;
Chris@69:    }
Chris@69: }
Chris@69: 
Chris@69: int main(void)
Chris@69: {
Chris@69:    ALLOC_STACK;
Chris@69:    test_rotation(15, 3);
Chris@69:    test_rotation(23, 5);
Chris@69:    test_rotation(50, 3);
Chris@69:    test_rotation(80, 1);
Chris@69:    return ret;
Chris@69: }