--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/tests/ima_adpcm_tests.c	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,214 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * ima_adpcm_tests.c - Test the IMA/DVI/Intel ADPCM encode and decode
+ *                     software.
+ *
+ * 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: ima_adpcm_tests.c,v 1.22 2006/11/19 14:07:27 steveu Exp $
+ */
+
+/*! \file */
+
+/*! \page ima_adpcm_tests_page IMA ADPCM tests
+\section ima_adpcm_tests_page_sec_1 What does it do?
+To perform a general audio quality test, ima_adpcm_tests should be run. The test file
+../localtests/short_nb_voice.wav will be compressed to the specified bit rate,
+decompressed, and the resulting audio stored in post_ima_adpcm.wav. A simple SNR test
+is automatically performed. Listening tests may be used for a more detailed evaluation
+of the degradation in quality caused by the compression.
+
+\section ima_adpcm_tests_page_sec_2 How is it used?
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#if defined(HAVE_TGMATH_H)
+#include <tgmath.h>
+#endif
+#if defined(HAVE_MATH_H)
+#include <math.h>
+#endif
+#include <stdio.h>
+#include <time.h>
+#include <fcntl.h>
+#include <audiofile.h>
+#include <tiffio.h>
+
+#include "spandsp.h"
+
+#define IN_FILE_NAME    "../localtests/short_nb_voice.wav"
+#define OUT_FILE_NAME   "post_ima_adpcm.wav"
+
+#define HIST_LEN        1000
+
+int main(int argc, char *argv[])
+{
+    int i;
+    AFfilehandle inhandle;
+    AFfilehandle outhandle;
+    AFfilesetup filesetup;
+    int frames;
+    int dec_frames;
+    int outframes;
+    int ima_bytes;
+    float x;
+    double pre_energy;
+    double post_energy;
+    double diff_energy;
+    int16_t pre_amp[HIST_LEN];
+    int16_t post_amp[HIST_LEN];
+    uint8_t ima_data[HIST_LEN];
+    int16_t history[HIST_LEN];
+    int hist_in;
+    int hist_out;
+    ima_adpcm_state_t *ima_enc_state;
+    ima_adpcm_state_t *ima_dec_state;
+    int xx;
+    int vbr;
+    const char *in_file_name;
+
+    vbr = FALSE;
+    in_file_name = IN_FILE_NAME;
+    for (i = 1;  i < argc;  i++)
+    {
+        if (strcmp(argv[i], "-v") == 0)
+        {
+            vbr = TRUE;
+            continue;
+        }
+        if (strcmp(argv[i], "-i") == 0)
+        {
+            in_file_name = argv[++i];
+            continue;
+        }
+        fprintf(stderr, "Unknown parameter %s specified.\n", argv[i]);
+        exit(2);
+    }
+
+    if ((inhandle = afOpenFile(in_file_name, "r", 0)) == AF_NULL_FILEHANDLE)
+    {
+        printf("    Cannot open wave file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if ((x = afGetFrameSize(inhandle, AF_DEFAULT_TRACK, 1)) != 2.0)
+    {
+        printf("    Unexpected frame size in wave file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if ((x = afGetRate(inhandle, AF_DEFAULT_TRACK)) != (float) SAMPLE_RATE)
+    {
+        printf("    Unexpected sample rate in wave file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if ((x = afGetChannels(inhandle, AF_DEFAULT_TRACK)) != 1.0)
+    {
+        printf("    Unexpected number of channels in wave file '%s'\n", in_file_name);
+        exit(2);
+    }
+
+    if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
+    {
+        fprintf(stderr, "    Failed to create file setup\n");
+        exit(2);
+    }
+    afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
+    afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
+    afInitFileFormat(filesetup, AF_FILE_WAVE);
+    afInitChannels(filesetup, AF_DEFAULT_TRACK, 1);
+    if ((outhandle = afOpenFile(OUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
+    {
+        fprintf(stderr, "    Cannot create wave file '%s'\n", OUT_FILE_NAME);
+        exit(2);
+    }
+
+    if ((ima_enc_state = ima_adpcm_init(NULL, (vbr)  ?  IMA_ADPCM_VDVI  :  IMA_ADPCM_DVI4)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create encoder\n");
+        exit(2);
+    }
+        
+    if ((ima_dec_state = ima_adpcm_init(NULL, (vbr)  ?  IMA_ADPCM_VDVI  :  IMA_ADPCM_DVI4)) == NULL)
+    {
+        fprintf(stderr, "    Cannot create decoder\n");
+        exit(2);
+    }
+
+    hist_in = 0;
+    hist_out = 0;
+    pre_energy = 0.0;
+    post_energy = 0.0;
+    diff_energy = 0.0;
+    while ((frames = afReadFrames(inhandle, AF_DEFAULT_TRACK, pre_amp, 159)))
+    {
+        ima_bytes = ima_adpcm_encode(ima_enc_state, ima_data, pre_amp, frames);
+        dec_frames = ima_adpcm_decode(ima_dec_state, post_amp, ima_data, ima_bytes);
+        for (i = 0;  i < frames;  i++)
+        {
+            history[hist_in++] = pre_amp[i];
+            if (hist_in >= HIST_LEN)
+                hist_in = 0;
+            pre_energy += (double) pre_amp[i] * (double) pre_amp[i];
+        }
+        for (i = 0;  i < dec_frames;  i++)
+        {
+            post_energy += (double) post_amp[i] * (double) post_amp[i];
+            xx = post_amp[i] - history[hist_out++];
+            if (hist_out >= HIST_LEN)
+                hist_out = 0;
+            diff_energy += (double) xx * (double) xx;
+        }
+        outframes = afWriteFrames(outhandle, AF_DEFAULT_TRACK, post_amp, dec_frames);
+    }
+    if (afCloseFile(inhandle) != 0)
+    {
+        printf("    Cannot close wave file '%s'\n", in_file_name);
+        exit(2);
+    }
+    if (afCloseFile(outhandle) != 0)
+    {
+        printf("    Cannot close wave file '%s'\n", OUT_FILE_NAME);
+        exit(2);
+    }
+    afFreeFileSetup(filesetup);
+    ima_adpcm_release(ima_enc_state);
+    ima_adpcm_release(ima_dec_state);
+
+    printf("Output energy is %f%% of input energy.\n", 100.0*post_energy/pre_energy);
+    printf("Residual energy is %f%% of the total.\n", 100.0*diff_energy/post_energy);
+    if (fabs(1.0 - post_energy/pre_energy) > 0.05
+        ||
+        fabs(diff_energy/post_energy) > 0.03)
+    {
+        printf("Tests failed.\n");
+        exit(2);
+    }
+    
+    printf("Tests passed.\n");
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/