--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/tests/time_scale_tests.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,169 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * time_scale_tests.c
+ *
+ * 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: time_scale_tests.c,v 1.24 2009/05/30 15:23:14 steveu Exp $
+ */
+
+/*! \page time_scale_tests_page Time scaling tests
+\section time_scale_tests_page_sec_1 What does it do?
+These tests run a speech file through the time scaling routines.
+
+\section time_scale_tests_page_sec_2 How are the tests run?
+These tests process a speech file called pre_time_scale.wav. This file should contain
+8000 sample/second 16 bits/sample linear audio. The tests read this file, change the
+time scale of its contents, and write the resulting audio to post_time_scale.wav.
+This file also contains 8000 sample/second 16 bits/sample linear audio.
+*/
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sndfile.h>
+
+#include "spandsp.h"
+
+#include "spandsp/private/time_scale.h"
+
+#define BLOCK_LEN       160
+
+#define IN_FILE_NAME    "../test-data/local/short_nb_voice.wav"
+#define OUT_FILE_NAME   "time_scale_result.wav"
+
+int main(int argc, char *argv[])
+{
+    SNDFILE *inhandle;
+    SNDFILE *outhandle;
+    SF_INFO info;
+    int16_t in[BLOCK_LEN];
+    int16_t out[5*(BLOCK_LEN + TIME_SCALE_MAX_SAMPLE_RATE/TIME_SCALE_MIN_PITCH)];
+    int frames;
+    int new_frames;
+    int out_frames;
+    int count;
+    int max;
+    time_scale_state_t state;
+    float rate;
+    float sample_rate;
+    const char *in_file_name;
+    int sweep_rate;
+    int opt;
+
+    rate = 1.8f;
+    sweep_rate = FALSE;
+    in_file_name = IN_FILE_NAME;
+    while ((opt = getopt(argc, argv, "i:r:s")) != -1)
+    {
+        switch (opt)
+        {
+        case 'i':
+            in_file_name = optarg;
+            break;
+        case 'r':
+            rate = atof(optarg);
+            break;
+        case 's':
+            sweep_rate = TRUE;
+            break;
+        default:
+            //usage();
+            exit(2);
+            break;
+        }
+    }
+    if ((inhandle = sf_open(in_file_name, SFM_READ, &info)) == NULL)
+    {
+        printf("    Cannot open audio file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if (info.channels != 1)
+    {
+        printf("    Unexpected number of channels in audio file '%s'\n", in_file_name);
+        exit(2);
+    }
+    sample_rate = info.samplerate;
+
+    memset(&info, 0, sizeof(info));
+    info.frames = 0;
+    info.samplerate = sample_rate;
+    info.channels = 1;
+    info.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
+    info.sections = 1;
+    info.seekable = 1;
+
+    if ((outhandle = sf_open(OUT_FILE_NAME, SFM_WRITE, &info)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_NAME);
+        exit(2);
+    }
+
+    if ((time_scale_init(&state, (int) sample_rate, rate)) == NULL)
+    {
+        fprintf(stderr, "    Cannot start the time scaler\n");
+        exit(2);
+    }
+    max = time_scale_max_output_len(&state, BLOCK_LEN);
+    printf("Rate is %f, longest output block is %d\n", rate, max);
+    count = 0;
+    while ((frames = sf_readf_short(inhandle, in, BLOCK_LEN)))
+    {
+        new_frames = time_scale(&state, out, in, frames);
+        out_frames = sf_writef_short(outhandle, out, new_frames);
+        if (out_frames != new_frames)
+        {
+            fprintf(stderr, "    Error writing audio file\n");
+            exit(2);
+        }
+        if (sweep_rate  &&  ++count > 100)
+        {
+            if (rate > 0.5f)
+            {
+                rate -= 0.1f;
+                if (rate >= 0.99f  &&  rate <= 1.01f)
+                    rate -= 0.1f;
+                time_scale_init(&state, SAMPLE_RATE, rate);
+                max = time_scale_max_output_len(&state, BLOCK_LEN);
+                printf("Rate is %f, longest output block is %d\n", rate, max);
+            }
+            count = 0;
+        }
+    }
+    if (sf_close(inhandle) != 0)
+    {
+        printf("    Cannot close audio file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if (sf_close(outhandle) != 0)
+    {
+        printf("    Cannot close audio file '%s'\n", OUT_FILE_NAME);
+        exit(2);
+    }
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/