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_telephony(outhandle))
{
fprintf(stderr, " Cannot close audio file '%s'\n", OUT_FILE_NAME);
exit(2);
}
}
printf("Tests passed.\n");
}
int main(int argc, char *argv[])
{
AFfilehandle outhandle;
AFfilesetup filesetup;
power_meter_t power_meter;
int outframes;
int i;
int block;
int pre;
int post;
int alaw_failures;
int ulaw_failures;
float worst_alaw;
float worst_ulaw;
float tmp;
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);
}
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;
}
outframes = afWriteFrames(outhandle,
AF_DEFAULT_TRACK,
amp,
65536);
if (outframes != 65536)
{
fprintf(stderr, " Error writing wave 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;
}
outframes = afWriteFrames(outhandle,
AF_DEFAULT_TRACK,
amp,
65536);
if (outframes != 65536)
{
fprintf(stderr, " Error writing wave 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("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_dbm0(&power_meter));
outframes = afWriteFrames(outhandle,
AF_DEFAULT_TRACK,
amp,
8000);
if (outframes != 8000)
{
fprintf(stderr, " Error writing wave file\n");
exit(2);
}
if (0.1f < fabs(power_meter_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_dbm0(&power_meter));
outframes = afWriteFrames(outhandle,
AF_DEFAULT_TRACK,
amp,
8000);
if (outframes != 8000)
{
fprintf(stderr, " Error writing wave file\n");
exit(2);
}
if (0.1f < fabs(power_meter_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);
}
}
}
if (afCloseFile(outhandle))
{
fprintf(stderr, " Cannot close wave file '%s'\n", OUT_FILE_NAME);
exit(2);
}
afFreeFileSetup(filesetup);
printf("Tests passed.\n");
return 0;
}
