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comparison spandsp-0.0.3/spandsp-0.0.3/tests/g711_tests.c @ 5:f762bf195c4b

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import spandsp-0.0.3
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Fri, 25 Jun 2010 16:00:21 +0200
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4:26cd8f1ef0b1 5:f762bf195c4b
1 /*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * g711_tests.c
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2006 Steve Underwood
9 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2, as
14 * published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * $Id: g711_tests.c,v 1.4 2006/11/19 14:07:27 steveu Exp $
26 */
27
28 /*! \page g711_tests_page A-law and u-law conversion tests
29 \section g711_tests_page_sec_1 What does it do?
30
31 \section g711_tests_page_sec_2 How is it used?
32 */
33
34 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37
38 #include <inttypes.h>
39 #include <stdlib.h>
40 #include <stdio.h>
41 #include <fcntl.h>
42 #include <string.h>
43 #if defined(HAVE_TGMATH_H)
44 #include <tgmath.h>
45 #endif
46 #if defined(HAVE_MATH_H)
47 #include <math.h>
48 #endif
49 #include <assert.h>
50 #include <audiofile.h>
51 #include <tiffio.h>
52
53 #include "spandsp.h"
54
55 #define OUT_FILE_NAME "g711.wav"
56
57 int16_t amp[65536];
58
59 const uint8_t alaw_1khz_sine[] = {0x34, 0x21, 0x21, 0x34, 0xB4, 0xA1, 0xA1, 0xB4};
60 const uint8_t ulaw_1khz_sine[] = {0x1E, 0x0B, 0x0B, 0x1E, 0x9E, 0x8B, 0x8B, 0x9E};
61
62 int main(int argc, char *argv[])
63 {
64 AFfilehandle outhandle;
65 AFfilesetup filesetup;
66 power_meter_t power_meter;
67 int outframes;
68 int i;
69 int block;
70 int pre;
71 int post;
72 int alaw_failures;
73 int ulaw_failures;
74 float worst_alaw;
75 float worst_ulaw;
76 float tmp;
77
78 if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
79 {
80 fprintf(stderr, " Failed to create file setup\n");
81 exit(2);
82 }
83 afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
84 afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
85 afInitFileFormat(filesetup, AF_FILE_WAVE);
86 afInitChannels(filesetup, AF_DEFAULT_TRACK, 1);
87
88 if ((outhandle = afOpenFile(OUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
89 {
90 fprintf(stderr, " Cannot create wave file '%s'\n", OUT_FILE_NAME);
91 exit(2);
92 }
93
94 printf("Conversion accuracy tests.\n");
95 alaw_failures = 0;
96 ulaw_failures = 0;
97 worst_alaw = 0.0;
98 worst_ulaw = 0.0;
99 for (block = 0; block < 1; block++)
100 {
101 for (i = 0; i < 65536; i++)
102 {
103 pre = i - 32768;
104 post = alaw_to_linear(linear_to_alaw(pre));
105 if (abs(pre) > 140)
106 {
107 tmp = (float) abs(post - pre)/(float) abs(pre);
108 if (tmp > 0.10)
109 {
110 printf("A-law: Excessive error at %d (%d)\n", pre, post);
111 alaw_failures++;
112 }
113 if (tmp > worst_alaw)
114 worst_alaw = tmp;
115 }
116 else
117 {
118 /* Small values need different handling for sensible measurement */
119 if (abs(post - pre) > 15)
120 {
121 printf("A-law: Excessive error at %d (%d)\n", pre, post);
122 alaw_failures++;
123 }
124 }
125 amp[i] = post;
126 }
127 outframes = afWriteFrames(outhandle,
128 AF_DEFAULT_TRACK,
129 amp,
130 65536);
131 if (outframes != 65536)
132 {
133 fprintf(stderr, " Error writing wave file\n");
134 exit(2);
135 }
136 for (i = 0; i < 65536; i++)
137 {
138 pre = i - 32768;
139 post = ulaw_to_linear(linear_to_ulaw(pre));
140 if (abs(pre) > 40)
141 {
142 tmp = (float) abs(post - pre)/(float) abs(pre);
143 if (tmp > 0.10)
144 {
145 printf("u-law: Excessive error at %d (%d)\n", pre, post);
146 ulaw_failures++;
147 }
148 if (tmp > worst_ulaw)
149 worst_ulaw = tmp;
150 }
151 else
152 {
153 /* Small values need different handling for sensible measurement */
154 if (abs(post - pre) > 4)
155 {
156 printf("u-law: Excessive error at %d (%d)\n", pre, post);
157 ulaw_failures++;
158 }
159 }
160 amp[i] = post;
161 }
162 outframes = afWriteFrames(outhandle,
163 AF_DEFAULT_TRACK,
164 amp,
165 65536);
166 if (outframes != 65536)
167 {
168 fprintf(stderr, " Error writing wave file\n");
169 exit(2);
170 }
171 }
172 printf("Worst A-law error (ignoring small values) %f%%\n", worst_alaw*100.0);
173 printf("Worst u-law error (ignoring small values) %f%%\n", worst_ulaw*100.0);
174 if (alaw_failures || ulaw_failures)
175 {
176 printf("%d A-law values with excessive error\n", alaw_failures);
177 printf("%d u-law values with excessive error\n", ulaw_failures);
178 printf("Tests failed\n");
179 exit(2);
180 }
181
182 printf("Reference power level tests.\n");
183 power_meter_init(&power_meter, 7);
184
185 for (i = 0; i < 8000; i++)
186 {
187 amp[i] = ulaw_to_linear(ulaw_1khz_sine[i & 7]);
188 power_meter_update(&power_meter, amp[i]);
189 }
190 printf("Reference u-law 1kHz tone is %fdBm0\n", power_meter_dbm0(&power_meter));
191 outframes = afWriteFrames(outhandle,
192 AF_DEFAULT_TRACK,
193 amp,
194 8000);
195 if (outframes != 8000)
196 {
197 fprintf(stderr, " Error writing wave file\n");
198 exit(2);
199 }
200 if (0.1f < fabs(power_meter_dbm0(&power_meter)))
201 {
202 printf("Test failed.\n");
203 exit(2);
204 }
205
206 for (i = 0; i < 8000; i++)
207 {
208 amp[i] = alaw_to_linear(alaw_1khz_sine[i & 7]);
209 power_meter_update(&power_meter, amp[i]);
210 }
211 printf("Reference A-law 1kHz tone is %fdBm0\n", power_meter_dbm0(&power_meter));
212 outframes = afWriteFrames(outhandle,
213 AF_DEFAULT_TRACK,
214 amp,
215 8000);
216 if (outframes != 8000)
217 {
218 fprintf(stderr, " Error writing wave file\n");
219 exit(2);
220 }
221 if (0.1f < fabs(power_meter_dbm0(&power_meter)))
222 {
223 printf("Test failed.\n");
224 exit(2);
225 }
226
227 /* Check the transcoding functions. */
228 printf("Testing transcoding A-law -> u-law -> A-law\n");
229 for (i = 0; i < 256; i++)
230 {
231 if (alaw_to_ulaw(ulaw_to_alaw(i)) != i)
232 {
233 if (abs(alaw_to_ulaw(ulaw_to_alaw(i)) - i) > 1)
234 {
235 printf("u-law -> A-law -> u-law gave %d -> %d\n", i, alaw_to_ulaw(ulaw_to_alaw(i)));
236 printf("Test failed\n");
237 exit(2);
238 }
239 }
240 }
241
242 printf("Testing transcoding u-law -> A-law -> u-law\n");
243 for (i = 0; i < 256; i++)
244 {
245 if (ulaw_to_alaw(alaw_to_ulaw(i)) != i)
246 {
247 if (abs(alaw_to_ulaw(ulaw_to_alaw(i)) - i) > 1)
248 {
249 printf("A-law -> u-law -> A-law gave %d -> %d\n", i, ulaw_to_alaw(alaw_to_ulaw(i)));
250 printf("Test failed\n");
251 exit(2);
252 }
253 }
254 }
255
256 if (afCloseFile(outhandle))
257 {
258 fprintf(stderr, " Cannot close wave file '%s'\n", OUT_FILE_NAME);
259 exit(2);
260 }
261 afFreeFileSetup(filesetup);
262
263 printf("Tests passed.\n");
264 return 0;
265 }
266 /*- End of function --------------------------------------------------------*/
267 /*- End of file ------------------------------------------------------------*/

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