Alg_parameters_ptr Alg_reader::process_attributes(
Alg_parameters_ptr attributes, double time)
{
// print "process_attributes:", attributes
bool ts_flag = false;
if (attributes) {
Alg_parameters_ptr a;
bool in_seconds = seq->get_units_are_seconds();
if (a = Alg_parameters::remove_key(&attributes, "tempor")) {
double tempo = a->parm.r;
seq->insert_tempo(tempo, seq->get_time_map()->time_to_beat(time));
}
if (a = Alg_parameters::remove_key(&attributes, "beatr")) {
double beat = a->parm.r;
seq->insert_beat(time, beat);
}
if (a = Alg_parameters::remove_key(&attributes, "timesig_numr")) {
tsnum = a->parm.r;
ts_flag = true;
}
if (a = Alg_parameters::remove_key(&attributes, "timesig_denr")) {
tsden = a->parm.r;
ts_flag = true;
}
if (ts_flag) {
seq->set_time_sig(seq->get_time_map()->time_to_beat(time),
tsnum, tsden);
}
if (in_seconds) seq->convert_to_seconds();
}
return attributes; // in case it was modified
}
void Alg_midifile_reader::Mf_tempo(int tempo)
{
double beat = get_currtime();
beat = beat / divisions; // convert to quarters
// 6000000 us/min / n us/beat => beat / min
double bpm = 60000000.0 / tempo;
seq->insert_tempo(bpm, beat);
}