williamp/osmocom-analog
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Indexing tables by casting index to unsigned integer only

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This commit is contained in:
Andreas Eversberg
2017-01-24 07:59:09 +01:00
parent 23a42aeb2c
commit 538a959128
5 changed files with 33 additions and 33 deletions
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16
src/anetz/dsp.c
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@@ -254,10 +254,10 @@ static void fsk_paging_tone(anetz_t *anetz, int16_t *samples, int length)
}
for (i = 0; i < length; i++) {
sample = (int32_t)dsp_sine_tone[((uint8_t)phase[0]) & 0xff]
+ (int32_t)dsp_sine_tone[((uint8_t)phase[1]) & 0xff]
+ (int32_t)dsp_sine_tone[((uint8_t)phase[2]) & 0xff]
+ (int32_t)dsp_sine_tone[((uint8_t)phase[3]) & 0xff];
sample = (int32_t)dsp_sine_tone[(uint8_t)phase[0]]
+ (int32_t)dsp_sine_tone[(uint8_t)phase[1]]
+ (int32_t)dsp_sine_tone[(uint8_t)phase[2]]
+ (int32_t)dsp_sine_tone[(uint8_t)phase[3]];
*samples++ = sample / 4.0 * anetz->page_gain;
phase[0] += phaseshift[0];
phase[1] += phaseshift[1];
@@ -300,12 +300,12 @@ static void fsk_paging_tone_sequence(anetz_t *anetz, int16_t *samples, int lengt
while (length) {
/* use tone, but during transition of tones, keep phase 0 degrees (high level) until next tone reaches 0 degrees (high level) */
if (!transition)
*samples++ = dsp_sine_tone[((uint8_t)phase[tone]) & 0xff] * anetz->page_gain;
*samples++ = dsp_sine_tone[(uint8_t)phase[tone]] * anetz->page_gain;
else {
/* fade between old an new tone */
*samples++
= (double)dsp_sine_tone[((uint8_t)phase[(tone - 1) & 3]) & 0xff] * (double)(transition - count) / (double)transition / 2.0 * anetz->page_gain
+ (double)dsp_sine_tone[((uint8_t)phase[tone]) & 0xff] * (double)count / (double)transition / 2.0 * anetz->page_gain;
= (double)dsp_sine_tone[(uint8_t)phase[(tone - 1) & 3]] * (double)(transition - count) / (double)transition / 2.0 * anetz->page_gain
+ (double)dsp_sine_tone[(uint8_t)phase[tone]] * (double)count / (double)transition / 2.0 * anetz->page_gain;
}
phase[0] += phaseshift[0];
phase[1] += phaseshift[1];
@@ -350,7 +350,7 @@ static void fsk_tone(anetz_t *anetz, int16_t *samples, int length)
phase = anetz->tone_phase256;
for (i = 0; i < length; i++) {
*samples++ = dsp_sine_tone[((uint8_t)phase) & 0xff];
*samples++ = dsp_sine_tone[(uint8_t)phase];
phase += phaseshift;
if (phase >= 256)
phase -= 256;