--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/tests/g711_tests.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,518 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * g711_tests.c
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2006 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: g711_tests.c,v 1.17 2009/05/30 15:23:13 steveu Exp $
+ */
+
+/*! \page g711_tests_page A-law and u-law conversion tests
+\section g711_tests_page_sec_1 What does it do?
+
+\section g711_tests_page_sec_2 How is it used?
+*/
+
+#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 <sndfile.h>
+
+//#if defined(WITH_SPANDSP_INTERNALS)
+#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
+//#endif
+
+#include "spandsp.h"
+#include "spandsp-sim.h"
+
+#define BLOCK_LEN           160
+
+#define IN_FILE_NAME        "../test-data/local/short_nb_voice.wav"
+#define ENCODED_FILE_NAME   "g711.g711"
+#define OUT_FILE_NAME       "post_g711.wav"
+
+int16_t amp[65536];
+uint8_t ulaw_data[65536];
+uint8_t alaw_data[65536];
+
+const uint8_t alaw_1khz_sine[] = {0x34, 0x21, 0x21, 0x34, 0xB4, 0xA1, 0xA1, 0xB4};
+const uint8_t ulaw_1khz_sine[] = {0x1E, 0x0B, 0x0B, 0x1E, 0x9E, 0x8B, 0x8B, 0x9E};
+
+static void compliance_tests(int log_audio)
+{
+    SNDFILE *outhandle;
+    power_meter_t power_meter;
+    int outframes;
+    int i;
+    int block;
+    int pre;
+    int post;
+    int post_post;
+    int alaw_failures;
+    int ulaw_failures;
+    float worst_alaw;
+    float worst_ulaw;
+    float tmp;
+    int len;
+    g711_state_t *enc_state;
+    g711_state_t *transcode;
+    g711_state_t *dec_state;
+
+    outhandle = NULL;
+    if (log_audio)
+    {
+        if ((outhandle = sf_open_telephony_write(OUT_FILE_NAME, 1)) == NULL)
+        {
+            fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_NAME);
+            exit(2);
+        }
+    }
+
+    printf("Conversion accuracy tests.\n");
+    alaw_failures = 0;
+    ulaw_failures = 0;
+    worst_alaw = 0.0;
+    worst_ulaw = 0.0;
+    for (block = 0;  block < 1;  block++)
+    {
+        for (i = 0;  i < 65536;  i++)
+        {
+            pre = i - 32768;
+            post = alaw_to_linear(linear_to_alaw(pre));
+            if (abs(pre) > 140)
+            {
+                tmp = (float) abs(post - pre)/(float) abs(pre);
+                if (tmp > 0.10)
+                {
+                    printf("A-law: Excessive error at %d (%d)\n", pre, post);
+                    alaw_failures++;
+                }
+                if (tmp > worst_alaw)
+                    worst_alaw = tmp;
+            }
+            else
+            {
+                /* Small values need different handling for sensible measurement */
+                if (abs(post - pre) > 15)
+                {
+                    printf("A-law: Excessive error at %d (%d)\n", pre, post);
+                    alaw_failures++;
+                }
+            }
+            amp[i] = post;
+        }
+        if (log_audio)
+        {
+            outframes = sf_writef_short(outhandle, amp, 65536);
+            if (outframes != 65536)
+            {
+                fprintf(stderr, "    Error writing audio file\n");
+                exit(2);
+            }
+        }
+        for (i = 0;  i < 65536;  i++)
+        {
+            pre = i - 32768;
+            post = ulaw_to_linear(linear_to_ulaw(pre));
+            if (abs(pre) > 40)
+            {
+                tmp = (float) abs(post - pre)/(float) abs(pre);
+                if (tmp > 0.10)
+                {
+                    printf("u-law: Excessive error at %d (%d)\n", pre, post);
+                    ulaw_failures++;
+                }
+                if (tmp > worst_ulaw)
+                    worst_ulaw = tmp;
+            }
+            else
+            {
+                /* Small values need different handling for sensible measurement */
+                if (abs(post - pre) > 4)
+                {
+                    printf("u-law: Excessive error at %d (%d)\n", pre, post);
+                    ulaw_failures++;
+                }
+            }
+            amp[i] = post;
+        }
+        if (log_audio)
+        {
+            outframes = sf_writef_short(outhandle, amp, 65536);
+            if (outframes != 65536)
+            {
+                fprintf(stderr, "    Error writing audio file\n");
+                exit(2);
+            }
+        }
+    }
+    printf("Worst A-law error (ignoring small values) %f%%\n", worst_alaw*100.0);
+    printf("Worst u-law error (ignoring small values) %f%%\n", worst_ulaw*100.0);
+    if (alaw_failures  ||  ulaw_failures)
+    {
+        printf("%d A-law values with excessive error\n", alaw_failures);
+        printf("%d u-law values with excessive error\n", ulaw_failures);
+        printf("Tests failed\n");
+        exit(2);
+    }
+    
+    printf("Cyclic conversion repeatability tests.\n");
+    /* Find what happens to every possible linear value after a round trip. */
+    for (i = 0;  i < 65536;  i++)
+    {
+        pre = i - 32768;
+        /* Make a round trip */
+        post = alaw_to_linear(linear_to_alaw(pre));
+        /* A second round trip should cause no further change */
+        post_post = alaw_to_linear(linear_to_alaw(post));
+        if (post_post != post)
+        {
+            printf("A-law second round trip mismatch - at %d, %d != %d\n", pre, post, post_post);
+            printf("Tests failed\n");
+            exit(2);
+        }
+        /* Make a round trip */
+        post = ulaw_to_linear(linear_to_ulaw(pre));
+        /* A second round trip should cause no further change */
+        post_post = ulaw_to_linear(linear_to_ulaw(post));
+        if (post_post != post)
+        {
+            printf("u-law round trip mismatch - at %d, %d != %d\n", pre, post, post_post);
+            printf("Tests failed\n");
+            exit(2);
+        }
+    }
+    
+    printf("Reference power level tests.\n");
+    power_meter_init(&power_meter, 7);
+
+    for (i = 0;  i < 8000;  i++)
+    {
+        amp[i] = ulaw_to_linear(ulaw_1khz_sine[i & 7]);
+        power_meter_update(&power_meter, amp[i]);
+    }
+    printf("Reference u-law 1kHz tone is %fdBm0\n", power_meter_current_dbm0(&power_meter));
+    if (log_audio)
+    {
+        outframes = sf_writef_short(outhandle, amp, 8000);
+        if (outframes != 8000)
+        {
+            fprintf(stderr, "    Error writing audio file\n");
+            exit(2);
+        }
+    }
+    if (0.1f < fabs(power_meter_current_dbm0(&power_meter)))
+    {
+        printf("Test failed.\n");
+        exit(2);
+    }
+
+    for (i = 0;  i < 8000;  i++)
+    {
+        amp[i] = alaw_to_linear(alaw_1khz_sine[i & 7]);
+        power_meter_update(&power_meter, amp[i]);
+    }
+    printf("Reference A-law 1kHz tone is %fdBm0\n", power_meter_current_dbm0(&power_meter));
+    if (log_audio)
+    {
+        outframes = sf_writef_short(outhandle, amp, 8000);
+        if (outframes != 8000)
+        {
+            fprintf(stderr, "    Error writing audio file\n");
+            exit(2);
+        }
+    }
+    if (0.1f < fabs(power_meter_current_dbm0(&power_meter)))
+    {
+        printf("Test failed.\n");
+        exit(2);
+    }
+
+    /* Check the transcoding functions. */
+    printf("Testing transcoding A-law -> u-law -> A-law\n");
+    for (i = 0;  i < 256;  i++)
+    {
+        if (alaw_to_ulaw(ulaw_to_alaw(i)) != i)
+        {
+            if (abs(alaw_to_ulaw(ulaw_to_alaw(i)) - i) > 1)
+            {
+                printf("u-law -> A-law -> u-law gave %d -> %d\n", i, alaw_to_ulaw(ulaw_to_alaw(i)));
+                printf("Test failed\n");
+                exit(2);
+            }
+        }
+    }
+
+    printf("Testing transcoding u-law -> A-law -> u-law\n");
+    for (i = 0;  i < 256;  i++)
+    {
+        if (ulaw_to_alaw(alaw_to_ulaw(i)) != i)
+        {
+            if (abs(alaw_to_ulaw(ulaw_to_alaw(i)) - i) > 1)
+            {
+                printf("A-law -> u-law -> A-law gave %d -> %d\n", i, ulaw_to_alaw(alaw_to_ulaw(i)));
+                printf("Test failed\n");
+                exit(2);
+            }
+        }
+    }
+    
+    enc_state = g711_init(NULL, G711_ALAW);
+    transcode = g711_init(NULL, G711_ALAW);
+    dec_state = g711_init(NULL, G711_ULAW);
+
+    len = 65536;
+    for (i = 0;  i < len;  i++)
+        amp[i] = i - 32768;
+    len = g711_encode(enc_state, alaw_data, amp, len);
+    len = g711_transcode(transcode, ulaw_data, alaw_data, len);
+    len = g711_decode(dec_state, amp, ulaw_data, len);
+    if (len != 65536)
+    {
+        printf("Block coding gave the wrong length - %d instead of %d\n", len, 65536);
+        printf("Test failed\n");
+        exit(2);
+    }
+    for (i = 0;  i < len;  i++)
+    {
+        pre = i - 32768;
+        post = amp[i];
+        if (abs(pre) > 140)
+        {
+            tmp = (float) abs(post - pre)/(float) abs(pre);
+            if (tmp > 0.10)
+            {
+                printf("Block: Excessive error at %d (%d)\n", pre, post);
+                exit(2);
+            }
+        }
+        else
+        {
+            /* Small values need different handling for sensible measurement */
+            if (abs(post - pre) > 15)
+            {
+                printf("Block: Excessive error at %d (%d)\n", pre, post);
+                exit(2);
+            }
+        }
+    }
+    g711_release(enc_state);
+    g711_release(transcode);
+    g711_release(dec_state);
+
+    if (log_audio)
+    {
+        if (sf_close(outhandle))
+        {
+            fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_NAME);
+            exit(2);
+        }
+    }
+
+    printf("Tests passed.\n");
+}
+/*- End of function --------------------------------------------------------*/
+
+int main(int argc, char *argv[])
+{
+    SNDFILE *inhandle;
+    SNDFILE *outhandle;
+    int outframes;
+    int opt;
+    int samples;
+    int len2;
+    int len3;
+    int basic_tests;
+    int law;
+    int encode;
+    int decode;
+    int file;
+    const char *in_file;
+    const char *out_file;
+    g711_state_t *enc_state;
+    g711_state_t *dec_state;
+    int16_t indata[BLOCK_LEN];
+    int16_t outdata[BLOCK_LEN];
+    uint8_t g711data[BLOCK_LEN];
+
+    basic_tests = TRUE;
+    law = G711_ALAW;
+    encode = FALSE;
+    decode = FALSE;
+    in_file = NULL;
+    out_file = NULL;
+    while ((opt = getopt(argc, argv, "ad:e:l:u")) != -1)
+    {
+        switch (opt)
+        {
+        case 'a':
+            law = G711_ALAW;
+            basic_tests = FALSE;
+            break;
+        case 'd':
+            in_file = optarg;
+            basic_tests = FALSE;
+            decode = TRUE;
+            break;
+        case 'e':
+            in_file = optarg;
+            basic_tests = FALSE;
+            encode = TRUE;
+            break;
+        case 'l':
+            out_file = optarg;
+            break;
+        case 'u':
+            law = G711_ULAW;
+            basic_tests = FALSE;
+            break;
+        default:
+            //usage();
+            exit(2);
+        }
+    }
+
+    if (basic_tests)
+    {
+        compliance_tests(TRUE);
+    }
+    else
+    {
+        if (!decode  &&  !encode)
+        {
+            decode =
+            encode = TRUE;
+        }
+        if (in_file == NULL)
+        {
+            in_file = (encode)  ?  IN_FILE_NAME  :  ENCODED_FILE_NAME;
+        }
+        if (out_file == NULL)
+        {
+            out_file = (decode)  ?  OUT_FILE_NAME  :  ENCODED_FILE_NAME;
+        }
+        inhandle = NULL;
+        outhandle = NULL;
+        file = -1;
+        enc_state = NULL;
+        dec_state = NULL;
+        if (encode)
+        {
+            if ((inhandle = sf_open_telephony_read(in_file, 1)) == NULL)
+            {
+                fprintf(stderr, "    Cannot open audio file '%s'\n", in_file);
+                exit(2);
+            }
+            enc_state = g711_init(NULL, law);
+        }
+        else
+        {
+            if ((file = open(in_file, O_RDONLY)) < 0)
+            {
+                fprintf(stderr, "    Failed to open '%s'\n", in_file);
+                exit(2);
+            }
+        }
+        if (decode)
+        {
+            if ((outhandle = sf_open_telephony_write(out_file, 1)) == NULL)
+            {
+                fprintf(stderr, "    Cannot create audio file '%s'\n", out_file);
+                exit(2);
+            }
+            dec_state = g711_init(NULL, law);
+        }
+        else
+        {
+            if ((file = open(out_file, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0)
+            {
+                fprintf(stderr, "    Failed to open '%s'\n", out_file);
+                exit(2);
+            }
+        }
+        for (;;)
+        {
+            if (encode)
+            {
+                samples = sf_readf_short(inhandle, indata, BLOCK_LEN);
+                if (samples <= 0)
+                    break;
+                len2 = g711_encode(enc_state, g711data, indata, samples);
+            }
+            else
+            {
+                len2 = read(file, g711data, BLOCK_LEN);
+                if (len2 <= 0)
+                    break;
+            }
+            if (decode)
+            {
+                len3 = g711_decode(dec_state, outdata, g711data, len2);
+                outframes = sf_writef_short(outhandle, outdata, len3);
+                if (outframes != len3)
+                {
+                    fprintf(stderr, "    Error writing audio file\n");
+                    exit(2);
+                }
+            }
+            else
+            {
+                len3 = write(file, g711data, len2);
+                if (len3 <= 0)
+                    break;
+            }
+        }
+        if (encode)
+        {
+            if (sf_close(inhandle))
+            {
+                fprintf(stderr, "    Cannot close audio file '%s'\n", IN_FILE_NAME);
+                exit(2);
+            }
+        }
+        else
+        {
+            close(file);
+        }
+        if (decode)
+        {
+            if (sf_close(outhandle))
+            {
+                fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_NAME);
+                exit(2);
+            }
+        }
+        else
+        {
+            close(file);
+        }
+        printf("'%s' translated to '%s' using %s.\n", in_file, out_file, (law == G711_ALAW)  ?  "A-law"  :  "u-law");
+    }
+    return 0;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/