--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/tests/plc_tests.c	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,208 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * plc_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: plc_tests.c,v 1.18 2006/11/19 14:07:27 steveu Exp $
+ */
+
+/*! \page plc_tests_page Packet loss concealment tests
+\section plc_tests_page_sec_1 What does it do?
+These tests run a speech file through the packet loss concealment routines.
+The loss rate, in percent, and the packet size, in samples, may be specified
+on the command line.
+
+\section plc_tests_page_sec_2 How are the tests run?
+These tests process a speech file called pre_plc.wav. This file should contain
+8000 sample/second 16 bits/sample linear audio. The tests read this file in
+blocks, of a size specified on the command line. Some of these blocks are
+dropped, to simulate packet loss. The rate of loss is also specified on the
+command line. The PLC module is then used to reconstruct an acceptable
+approximation to the original signal. The resulting audio is written to a new
+audio file, called post_plc.wav. This file contains 8000 sample/second
+16 bits/sample linear audio.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(HAVE_TGMATH_H)
+#include <tgmath.h>
+#endif
+#if defined(HAVE_MATH_H)
+#include <math.h>
+#endif
+#include <tiffio.h>
+
+#include <audiofile.h>
+
+#include "spandsp.h"
+
+#define INPUT_FILE_NAME     "../localtests/short_nb_voice.wav"
+#define OUTPUT_FILE_NAME    "post_plc.wav"
+
+int main(int argc, char *argv[])
+{
+    AFfilehandle inhandle;
+    AFfilehandle outhandle;
+    AFfilesetup filesetup;
+    plc_state_t plc;
+    int inframes;
+    int outframes;
+    int16_t amp[1024];
+    int block_no;
+    int lost_blocks;
+    int block_len;
+    int loss_rate;
+    int dropit;
+    int block_real;
+    int block_synthetic;
+    int tone;
+    int i;
+    uint32_t phase_acc;
+    int32_t phase_rate;
+
+    loss_rate = 25;
+    block_len = 160;
+    block_real = FALSE;
+    block_synthetic = FALSE;
+    tone = -1;
+    for (i = 1;  i < argc;  i++)
+    {
+        if (strcmp(argv[i], "-l") == 0)
+        {
+            loss_rate = atoi(argv[++i]);
+            continue;
+        }
+        if (strcmp(argv[i], "-b") == 0)
+        {
+            block_len = atoi(argv[++i]);
+            continue;
+        }
+        if (strcmp(argv[i], "-t") == 0)
+        {
+            tone = atoi(argv[++i]);
+            continue;
+        }
+        if (strcmp(argv[i], "-r") == 0)
+            block_real = TRUE;
+        if (strcmp(argv[i], "-s") == 0)
+            block_synthetic = TRUE;
+    }
+    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);
+
+    phase_rate = 0;
+    inhandle = NULL;
+    if (tone < 0)
+    {
+        if ((inhandle = afOpenFile(INPUT_FILE_NAME, "r", NULL)) == AF_NULL_FILEHANDLE)
+        {
+            fprintf(stderr, "    Failed to open wave file '%s'\n", INPUT_FILE_NAME);
+            exit(2);
+        }
+    }
+    else
+    {
+        phase_rate = dds_phase_ratef((float) tone);
+    }
+    if ((outhandle = afOpenFile(OUTPUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
+    {
+        fprintf(stderr, "    Failed to open wave file '%s'\n", OUTPUT_FILE_NAME);
+        exit(2);
+    }
+    plc_init(&plc);
+    lost_blocks = 0;
+    for (block_no = 0;  ;  block_no++)
+    {
+        if (tone < 0)
+        {
+            inframes = afReadFrames(inhandle,
+                                    AF_DEFAULT_TRACK,
+                                    amp,
+                                    block_len);
+            if (inframes != block_len)
+                break;
+        }
+        else
+        {
+            if (block_no > 10000)
+                break;
+            for (i = 0;  i < block_len;  i++)
+                amp[i] = (int16_t) dds_modf(&phase_acc, phase_rate, 10000.0, 0);
+            inframes = block_len;
+        }
+        dropit = rand()/(RAND_MAX/100);
+        if (dropit > loss_rate)
+        {
+            plc_rx(&plc, amp, inframes);
+            if (block_real)
+                memset(amp, 0, sizeof(int16_t)*inframes);
+        }
+        else
+        {
+            lost_blocks++;
+            plc_fillin(&plc, amp, inframes);
+            if (block_synthetic)
+                memset(amp, 0, sizeof(int16_t)*inframes);
+        }
+        outframes = afWriteFrames(outhandle,
+                                  AF_DEFAULT_TRACK,
+                                  amp,
+                                  inframes);
+        if (outframes != inframes)
+        {
+            fprintf(stderr, "    Error writing out sound\n");
+            exit(2);
+        }
+    }
+    printf("Dropped %d of %d blocks\n", lost_blocks, block_no);
+    if (tone < 0)
+    {
+        if (afCloseFile(inhandle) != 0)
+        {
+            fprintf(stderr, "    Cannot close wave file '%s'\n", INPUT_FILE_NAME);
+            exit(2);
+        }
+    }
+    if (afCloseFile(outhandle) != 0)
+    {
+        fprintf(stderr, "    Cannot close wave file '%s'\n", OUTPUT_FILE_NAME);
+        exit(2);
+    }
+    afFreeFileSetup(filesetup);
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/