std::string
pulses_to_measurestring (midipulse p, const midi_timing & seqparms)
{
midi_measures measures;
char tmp[32];
if (is_null_midipulse(p))
p = 0; /* punt! */
pulses_to_midi_measures(p, seqparms, measures); /* fill measures struct */
snprintf
(
tmp, sizeof tmp, "%03d:%d:%03d",
measures.measures(), measures.beats(), measures.divisions()
);
return std::string(tmp);
}
void
jack_assistant::position (bool songmode, midipulse tick)
{
#ifdef SEQ64_JACK_SUPPORT
long current_tick = 0;
if (songmode) /* master in song mode */
{
if (! is_null_midipulse(tick))
current_tick = tick * 10;
}
int ticks_per_beat = m_ppqn * 10;
int beats_per_minute = parent().get_beats_per_minute();
uint64_t tick_rate = (uint64_t(m_jack_frame_rate) * current_tick * 60.0);
long tpb_bpm = ticks_per_beat * beats_per_minute * 4.0 / m_beat_width;
uint64_t jack_frame = tick_rate / tpb_bpm;
jack_transport_locate(m_jack_client, jack_frame);
#ifdef SEQ64_STAZED_JACK_SUPPORT
#if 0
/*
* The call to jack_BBT_position() is not necessary to change JACK
* position! Must set these here since they are set in timebase.
*/
jack_position_t pos;
double jack_tick = current_tick * m_bw / 4.0;
pos.ticks_per_beat = m_ppqn * 10;
pos.beats_per_minute = m_master_bus.get_bpm();
jack_BBT_position(pos, jack_tick);
/*
* Calculate JACK frame to put into pos.frame; it is what matters for
* position change. Very similar to the uncommented code above.
*/
uint64_t tick_rate = ((uint64_t)pos.frame_rate * current_tick * 60.0);
long tpb_bpm = pos.ticks_per_beat * pos.beats_per_minute *
4.0 / pos.beat_type;
pos.frame = tick_rate / tpb_bpm;
/*
* ticks * 10 = jack ticks;
* jack ticks / ticks per beat = num beats;
* num beats / beats per minute = num minutes
* num minutes * 60 = num seconds
* num secords * frame_rate = frame
*/
jack_transport_reposition(m_jack_client, &pos);
#endif // 0
if (parent().is_running())
parent().set_reposition(false);
#endif // SEQ64_STAZED_JACK_SUPPORT
Tutorial code from jack_assistant::position():
#ifdef SAMPLE_AUDIO_CODE // disabled, shown only for reference & learning
jack_transport_state_t ts = jack_transport_query(jack->client(), NULL);
if (ts == JackTransportRolling)
{
jack_default_audio_sample_t * in;
jack_default_audio_sample_t * out;
if (client_state == Init)
client_state = Run;
in = jack_port_get_buffer(input_port, nframes);
out = jack_port_get_buffer(output_port, nframes);
memcpy(out, in, sizeof (jack_default_audio_sample_t) * nframes);
}
else if (ts == JackTransportStopped)
{
if (client_state == Run)
client_state = Exit;
}
#endif
}
