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getters for volume and filter #47

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merged 1 commit into from
Nov 9, 2019
Merged

getters for volume and filter #47

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11 changes: 11 additions & 0 deletions src/ltc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -212,6 +212,11 @@ void ltc_encoder_reset(LTCEncoder *e) {
e->offset = 0;
}

double ltc_encoder_get_volume(LTCEncoder *e) {
ltcsnd_sample_t diff = (e->enc_hi - e->enc_lo) / 2;
return 20.0 * log10((double)diff / 127.0);
}

int ltc_encoder_set_volume(LTCEncoder *e, double dBFS) {
if (dBFS > 0)
return -1;
Expand All @@ -224,6 +229,12 @@ int ltc_encoder_set_volume(LTCEncoder *e, double dBFS) {
return 0;
}

double ltc_encoder_get_filter(LTCEncoder *e) {
const double num = -2000000.0 * exp(1.0);
const double den = e->sample_rate * log(1.0 - e->filter_const);
return num / den;
}

void ltc_encoder_set_filter(LTCEncoder *e, double rise_time) {
/* low-pass-filter
* LTC signal should have a rise time of 40 us +/- 10 us.
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16 changes: 16 additions & 0 deletions src/ltc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -698,6 +698,14 @@ void ltc_encoder_reset(LTCEncoder *e);
*/
int ltc_encoder_set_bufsize(LTCEncoder *e, double sample_rate, double fps);

/**
* Query the volume of the generated LTC signal
*
* @param e encoder handle
* @return the volume in dB full-scale (<= 0.0)
*/
double ltc_encoder_get_volume(LTCEncoder *e);

/**
* Set the volume of the generated LTC signal
*
Expand All @@ -716,6 +724,14 @@ int ltc_encoder_set_bufsize(LTCEncoder *e, double sample_rate, double fps);
*/
int ltc_encoder_set_volume(LTCEncoder *e, double dBFS);

/**
* Get encoder signal rise-time / signal filtering
*
* @param e encoder handle
* @return the signal rise-time in us (10^(-6) sec)
*/
double ltc_encoder_get_filter(LTCEncoder *e);

/**
* Set encoder signal rise-time / signal filtering
*
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