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simplify, improve and correct logic in Session::set_transport_speed()

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This commit is contained in:
Paul Davis 2021-04-19 15:45:47 -06:00
parent 14c2fdccf4
commit fc6cf7ddac
1 changed files with 20 additions and 66 deletions
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86
libs/ardour/session_transport.cc
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@ -400,6 +400,8 @@ Session::set_transport_speed (double speed, bool as_default, bool at_next_start)
ENSURE_PROCESS_THREAD;
DEBUG_TRACE (DEBUG::Transport, string_compose ("@ %1 Set transport speed to %2 from %3 (es = %4) (def %5), as_default %6\n", _transport_sample, speed, _transport_speed, _engine_speed, _default_transport_speed, as_default));
assert (speed != 0.0);
/* the logic:
a) engine speed is not 1.0 (normal speed)
@ -430,50 +432,8 @@ Session::set_transport_speed (double speed, bool as_default, bool at_next_start)
speed = max ((double) -Config->get_max_transport_speed(), speed);
}
double new_engine_speed = 1.0;
if (speed != 0) {
new_engine_speed = fabs (speed);
_requested_transport_speed = speed;
if (speed < 0) speed = -1;
if (speed > 0) speed = 1;
}
if (_transport_speed == speed && new_engine_speed == _engine_speed) {
if (as_default && speed == 0.0) { // => reset default transport speed. hacky or what?
_default_transport_speed = 1.0;
_default_engine_speed = 1.0;
}
return;
}
#if 0 // TODO pref: allow vari-speed recording
if (actively_recording() && speed != 1.0 && speed != 0.0) {
/* no varispeed during recording */
DEBUG_TRACE (DEBUG::Transport, string_compose ("No varispeed during recording cur_speed %1, sample %2\n",
_transport_speed, _transport_sample));
return;
}
#endif
_engine_speed = new_engine_speed;
if (as_default) {
_default_engine_speed = new_engine_speed;
_default_transport_speed = speed;
}
if (speed == 1.0 || speed == -1.0) {
TransportStateChange (); /* EMIT SIGNAL */
/* non-varispeed, we can return here */
return;
}
// TODO handled transport start.. _remaining_latency_preroll
// and reversal of playback direction.
double new_engine_speed = fabs (speed);
double new_transport_speed = (speed < 0) ? -1 : 1;
if ((synced_to_engine()) && speed != 0.0 && speed != 1.0) {
warning << string_compose (
@ -483,26 +443,17 @@ Session::set_transport_speed (double speed, bool as_default, bool at_next_start)
return;
}
#if 0
if (actively_recording()) {
return;
if (at_next_start) {
_requested_transport_speed = speed;
} else {
clear_clicks ();
_transport_speed = new_transport_speed;
_engine_speed = new_engine_speed;
}
#endif
if (speed > 0.0 && _transport_sample == current_end_sample()) {
return;
}
if (speed < 0.0 && _transport_sample == 0) {
return;
}
clear_clicks ();
_transport_speed = speed;
if (as_default) {
_default_transport_speed = speed;
_default_engine_speed = new_engine_speed;
_default_transport_speed = new_transport_speed;
}
DEBUG_TRACE (DEBUG::Transport, string_compose ("send TSC3 with speed = %1\n", _transport_speed));
@ -519,14 +470,17 @@ Session::set_transport_speed (double speed, bool as_default, bool at_next_start)
* The 0.2% dead-zone is somewhat arbitrary. Main use-case
* for TransportStateChange() here is the ShuttleControl display.
*/
if (fabs (_signalled_varispeed - actual_speed ()) > .002
const double act_speed = actual_speed ();
if (fabs (_signalled_varispeed - act_speed) > .002
// still, signal hard changes to 1.0 and 0.0:
|| (actual_speed () == 1.0 && _signalled_varispeed != 1.0)
|| (actual_speed () == 0.0 && _signalled_varispeed != 0.0)
|| (act_speed == 1.0 && _signalled_varispeed != 1.0)
|| (act_speed == 0.0 && _signalled_varispeed != 0.0)
)
{
TransportStateChange (); /* EMIT SIGNAL */
_signalled_varispeed = actual_speed ();
_signalled_varispeed = act_speed;
}
}
@ -892,7 +846,7 @@ Session::request_transport_speed (double speed, bool as_default, TransportReques
}
SessionEvent* ev = new SessionEvent (SessionEvent::SetTransportSpeed, SessionEvent::Add, SessionEvent::Immediate, 0, speed);
ev->third_yes_or_no = as_default; // as_default
ev->yes_or_no = as_default; // as_default
DEBUG_TRACE (DEBUG::Transport, string_compose ("Request transport speed = %1 as default = %2\n", speed, as_default));
queue_event (ev);
}