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livetrax/libs/surfaces/websockets/transport.cc
Paul Davis 7c3268d12f temporal: TempoMap::use() returns a const ptr to enforce semantics (library version)
This commit leaves two issues outstanding:

1. unclear/ugly semantics for drag operations that reset the GUI thread's tempo map to the writable copy
2. undo/redo for the tempo map

These will be addressed in future commits
2022-04-08 11:58:04 -06:00

95 lines
2.3 KiB
C++

/*
* Copyright (C) 2020 Luciano Iam <oss@lucianoiam.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sstream>
#include "ardour/tempo.h"
#include "transport.h"
using namespace ARDOUR;
using namespace ArdourSurface;
using namespace Temporal;
double
ArdourTransport::tempo () const
{
const Tempo& tempo (TempoMap::fetch()->metric_at (0).tempo());
return tempo.note_types_per_minute ();
}
void
ArdourTransport::set_tempo (double bpm)
{
bpm = std::max (0.01, bpm);
TempoMap::WritableSharedPtr tmap (TempoMap::write_copy());
Tempo tempo (bpm, tmap->metric_at (0).tempo().note_type ());
tmap->set_tempo (tempo, timepos_t());
TempoMap::update (tmap);
}
double
ArdourTransport::time () const
{
samplepos_t t = session ().transport_sample ();
samplecnt_t f = session ().sample_rate ();
return static_cast<double>(t) / static_cast<double>(f);
}
std::string
ArdourTransport::bbt () const
{
const samplepos_t t = session ().transport_sample ();
const Temporal::BBT_Time bbt_time = Temporal::TempoMap::fetch()->bbt_at (timepos_t (t));
std::ostringstream oss;
bbt_time.print_padded(oss);
return oss.str();
}
bool
ArdourTransport::roll () const
{
return basic_ui ().transport_rolling ();
}
void
ArdourTransport::set_roll (bool value)
{
if ((value && !roll ()) || (!value && roll ())) {
// this call is equivalent to hitting the spacebar
basic_ui ().toggle_roll (false, false);
}
}
bool
ArdourTransport::record () const
{
return session ().get_record_enabled ();
}
void
ArdourTransport::set_record (bool value)
{
if ((value && !record ()) || (!value && record ())) {
basic_ui ().rec_enable_toggle ();
}
}