bool obs_fader_set_mul(obs_fader_t *fader, const float mul)
{
if (!fader)
return false;
return obs_fader_set_db(fader, mul_to_db(mul));
}
static float cubic_def_to_db(const float def)
{
if (def == 1.0f)
return 0.0f;
else if (def <= 0.0f)
return -INFINITY;
return mul_to_db(def * def * def);
}
static inline void process_expansion(const struct expander_data *cd,
float **samples, uint32_t num_samples)
{
for (size_t i = 0; i < num_samples; ++i) {
float env_db = mul_to_db(cd->envelope_buf[i]);
float gain = fmaxf(cd->slope * (cd->threshold - env_db),
-60.0);
gain = db_to_mul(fminf(0, gain));
for (size_t c = 0; c < cd->num_channels; ++c) {
if (samples[c]) {
samples[c][i] *= gain * cd->output_gain;
}
}
}
}
static void fader_source_volume_changed(void *vptr, calldata_t *calldata)
{
struct obs_fader *fader = (struct obs_fader *) vptr;
pthread_mutex_lock(&fader->mutex);
if (fader->ignore_next_signal) {
fader->ignore_next_signal = false;
pthread_mutex_unlock(&fader->mutex);
return;
}
signal_handler_t *sh = fader->signals;
const float mul = (float)calldata_float(calldata, "volume");
const float db = mul_to_db(mul);
fader->cur_db = db;
pthread_mutex_unlock(&fader->mutex);
signal_volume_changed(sh, fader, db);
}
bool obs_fader_attach_source(obs_fader_t *fader, obs_source_t *source)
{
signal_handler_t *sh;
if (!fader || !source)
return false;
obs_fader_detach_source(fader);
pthread_mutex_lock(&fader->mutex);
sh = obs_source_get_signal_handler(source);
signal_handler_connect(sh, "volume",
fader_source_volume_changed, fader);
signal_handler_connect(sh, "destroy",
fader_source_destroyed, fader);
fader->source = source;
fader->cur_db = mul_to_db(obs_source_get_volume(source));
pthread_mutex_unlock(&fader->mutex);
return true;
}