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freeswitch/libs/spandsp/tests/g711_tests.c

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/*
* 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 ------------------------------------------------------------*/
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