--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/tests/line_model_tests.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,398 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * line_model_tests.c - Tests for the telephone line model.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2004 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: line_model_tests.c,v 1.28 2009/09/23 16:02:59 steveu Exp $
+ */
+
+/*! \page line_model_tests_page Telephony line model tests
+\section line_model_tests_page_sec_1 What does it do?
+???.
+
+\section line_model_tests_page_sec_2 How does it work?
+???.
+*/
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <sndfile.h>
+
+//#if defined(WITH_SPANDSP_INTERNALS)
+#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
+//#endif
+
+#include "spandsp.h"
+#include "spandsp-sim.h"
+
+#if !defined(NULL)
+#define NULL (void *) 0
+#endif
+
+#define BLOCK_LEN           160
+
+#define OUT_FILE_COMPLEXIFY "complexify.wav"
+#define IN_FILE_NAME1       "line_model_test_in1.wav"
+#define IN_FILE_NAME2       "line_model_test_in2.wav"
+#define OUT_FILE_NAME1      "line_model_one_way_test_out.wav"
+#define OUT_FILE_NAME2      "line_model_two_way_test_out.wav"
+
+int channel_codec;
+int rbs_pattern;
+
+static void complexify_tests(void)
+{
+    complexify_state_t *s;
+    complexf_t cc;
+    int16_t amp;
+    int i;
+    SNDFILE *outhandle;
+    int outframes;
+    int16_t out[40000];
+    awgn_state_t noise1;
+
+    if ((outhandle = sf_open_telephony_write(OUT_FILE_COMPLEXIFY, 2)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_COMPLEXIFY);
+        exit(2);
+    }
+    awgn_init_dbm0(&noise1, 1234567, -10.0f);
+    s = complexify_init();
+    for (i = 0;  i < 20000;  i++)
+    {
+        amp = awgn(&noise1);
+        cc = complexify(s, amp);
+        out[2*i] = cc.re;
+        out[2*i + 1] = cc.im;
+    }
+    outframes = sf_writef_short(outhandle, out, 20000);
+    if (outframes != 20000)
+    {
+        fprintf(stderr, "    Error writing audio file\n");
+        exit(2);
+    }
+    if (sf_close(outhandle))
+    {
+        fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_COMPLEXIFY);
+        exit(2);
+    }
+}
+/*- End of function --------------------------------------------------------*/
+
+static void test_one_way_model(int line_model_no, int speech_test)
+{
+    one_way_line_model_state_t *model;
+    int16_t input1[BLOCK_LEN];
+    int16_t output1[BLOCK_LEN];
+    int16_t amp[2*BLOCK_LEN];
+    SNDFILE *inhandle1;
+    SNDFILE *outhandle;
+    int outframes;
+    int samples;
+    int i;
+    int j;
+    awgn_state_t noise1;
+    
+    if ((model = one_way_line_model_init(line_model_no, -50, channel_codec, rbs_pattern)) == NULL)
+    {
+        fprintf(stderr, "    Failed to create line model\n");
+        exit(2);
+    }
+    
+    awgn_init_dbm0(&noise1, 1234567, -10.0f);
+
+    if (speech_test)
+    {
+        if ((inhandle1 = sf_open_telephony_read(IN_FILE_NAME1, 1)) == NULL)
+        {
+            fprintf(stderr, "    Cannot open audio file '%s'\n", IN_FILE_NAME1);
+            exit(2);
+        }
+    }
+    else
+    {
+        inhandle1 = NULL;
+    }
+    if ((outhandle = sf_open_telephony_write(OUT_FILE_NAME1, 1)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_NAME1);
+        exit(2);
+    }
+    for (i = 0;  i < 10000;  i++)
+    {
+        if (speech_test)
+        {
+            samples = sf_readf_short(inhandle1, input1, BLOCK_LEN);
+            if (samples == 0)
+                break;
+        }
+        else
+        {
+            for (j = 0;  j < BLOCK_LEN;  j++)
+                input1[j] = awgn(&noise1);
+            samples = BLOCK_LEN;
+        }
+        for (j = 0;  j < samples;  j++)
+        {
+            one_way_line_model(model, 
+                               &output1[j],
+                               &input1[j],
+                               1);
+            amp[j] = output1[j];
+        }
+        outframes = sf_writef_short(outhandle, amp, samples);
+        if (outframes != samples)
+        {
+            fprintf(stderr, "    Error writing audio file\n");
+            exit(2);
+        }
+    }
+    if (speech_test)
+    {
+        if (sf_close(inhandle1))
+        {
+            fprintf(stderr, "    Cannot close audio file '%s'\n", IN_FILE_NAME1);
+            exit(2);
+        }
+    }
+    if (sf_close(outhandle))
+    {
+        fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_NAME1);
+        exit(2);
+    }
+    one_way_line_model_release(model);
+}
+/*- End of function --------------------------------------------------------*/
+
+static void test_both_ways_model(int line_model_no, int speech_test)
+{
+    both_ways_line_model_state_t *model;
+    int16_t input1[BLOCK_LEN];
+    int16_t input2[BLOCK_LEN];
+    int16_t output1[BLOCK_LEN];
+    int16_t output2[BLOCK_LEN];
+    int16_t amp[2*BLOCK_LEN];
+    SNDFILE *inhandle1;
+    SNDFILE *inhandle2;
+    SNDFILE *outhandle;
+    int outframes;
+    int samples;
+    int i;
+    int j;
+    awgn_state_t noise1;
+    awgn_state_t noise2;
+    
+    if ((model = both_ways_line_model_init(line_model_no, -50, line_model_no + 1, -35, channel_codec, rbs_pattern)) == NULL)
+    {
+        fprintf(stderr, "    Failed to create line model\n");
+        exit(2);
+    }
+    
+    awgn_init_dbm0(&noise1, 1234567, -10.0f);
+    awgn_init_dbm0(&noise2, 1234567, -10.0f);
+
+    if (speech_test)
+    {
+        if ((inhandle1 = sf_open_telephony_read(IN_FILE_NAME1, 1)) == NULL)
+        {
+            fprintf(stderr, "    Cannot open audio file '%s'\n", IN_FILE_NAME1);
+            exit(2);
+        }
+        if ((inhandle2 = sf_open_telephony_read(IN_FILE_NAME2, 1)) == NULL)
+        {
+            fprintf(stderr, "    Cannot open audio file '%s'\n", IN_FILE_NAME2);
+            exit(2);
+        }
+    }
+    else
+    {
+        inhandle1 =
+        inhandle2 = NULL;
+    }
+    if ((outhandle = sf_open_telephony_write(OUT_FILE_NAME2, 2)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_NAME2);
+        exit(2);
+    }
+    for (i = 0;  i < 10000;  i++)
+    {
+        if (speech_test)
+        {
+            samples = sf_readf_short(inhandle1, input1, BLOCK_LEN);
+            if (samples == 0)
+                break;
+            samples = sf_readf_short(inhandle2, input2, samples);
+            if (samples == 0)
+                break;
+        }
+        else
+        {
+            for (j = 0;  j < BLOCK_LEN;  j++)
+            {
+                input1[j] = awgn(&noise1);
+                input2[j] = awgn(&noise2);
+            }
+            samples = BLOCK_LEN;
+        }
+        for (j = 0;  j < samples;  j++)
+        {
+            both_ways_line_model(model, 
+                                 &output1[j],
+                                 &input1[j],
+                                 &output2[j],
+                                 &input2[j],
+                                 1);
+            amp[2*j] = output1[j];
+            amp[2*j + 1] = output2[j];
+        }
+        outframes = sf_writef_short(outhandle, amp, samples);
+        if (outframes != samples)
+        {
+            fprintf(stderr, "    Error writing audio file\n");
+            exit(2);
+        }
+    }
+    if (speech_test)
+    {
+        if (sf_close(inhandle1))
+        {
+            fprintf(stderr, "    Cannot close audio file '%s'\n", IN_FILE_NAME1);
+            exit(2);
+        }
+        if (sf_close(inhandle2))
+        {
+            fprintf(stderr, "    Cannot close audio file '%s'\n", IN_FILE_NAME2);
+            exit(2);
+        }
+    }
+    if (sf_close(outhandle))
+    {
+        fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_NAME2);
+        exit(2);
+    }
+    both_ways_line_model_release(model);
+}
+/*- End of function --------------------------------------------------------*/
+
+static void test_line_filter(int line_model_no)
+{
+    float out;
+    double sumin;
+    double sumout;
+    int i;
+    int j;
+    int p;
+    int ptr;
+    int len;
+    swept_tone_state_t *s;
+    float filter[129];
+    int16_t buf[BLOCK_LEN];
+
+    s = swept_tone_init(NULL, 200.0f, 3900.0f, -10.0f, 120*SAMPLE_RATE, 0);
+    for (j = 0;  j < 129;  j++)
+        filter[j] = 0.0f;
+    ptr = 0;
+    for (;;)
+    {
+        if ((len = swept_tone(s, buf, BLOCK_LEN)) <= 0)
+            break;
+        sumin = 0.0;
+        sumout = 0.0;
+        for (i = 0;  i < len;  i++)
+        {
+            /* Add the sample in the filter buffer */
+            p = ptr;
+            filter[p] = buf[i];
+            if (++p == 129)
+                p = 0;
+            ptr = p;
+    
+            /* Apply the filter */
+            out = 0.0f;
+            for (j = 0;  j < 129;  j++)
+            {
+                out += line_models[line_model_no][128 - j]*filter[p];
+                if (++p >= 129)
+                    p = 0;
+            }
+            sumin += buf[i]*buf[i];
+            sumout += out*out;
+        }
+        /*endfor*/
+        printf("%7.1f %f\n", swept_tone_current_frequency(s), 10.0*log10(sumout/sumin));
+    }
+    /*endfor*/
+    swept_tone_free(s);
+}
+/*- End of function --------------------------------------------------------*/
+
+int main(int argc, char *argv[])
+{
+    int line_model_no;
+    int speech_test;
+    int log_audio;
+    int opt;
+
+    channel_codec = MUNGE_CODEC_NONE;
+    log_audio = FALSE;
+    line_model_no = 0;
+    rbs_pattern = 0;
+    speech_test = FALSE;
+    while ((opt = getopt(argc, argv, "c:lm:r:s:")) != -1)
+    {
+        switch (opt)
+        {
+        case 'c':
+            channel_codec = atoi(optarg);
+            break;
+        case 'l':
+            log_audio = TRUE;
+            break;
+        case 'm':
+            line_model_no = atoi(optarg);
+            break;
+        case 'r':
+            rbs_pattern = atoi(optarg);
+            break;
+        case 's':
+            speech_test = atoi(optarg);
+            break;
+        default:
+            //usage();
+            exit(2);
+        }
+    }
+    complexify_tests();
+    test_one_way_model(line_model_no, speech_test);
+    test_both_ways_model(line_model_no, speech_test);
+    test_line_filter(line_model_no);
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/