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livetrax/libs/ardour/fluid_synth.cc
luz paz 1e640563d6
Fix source comment typos in libs/ardour
Found via `codespell`
2022-05-11 00:14:28 +02:00

144 lines
3.9 KiB
C++

/*
* Copyright (C) 2016-2019 Robin Gareus <robin@gareus.org>
*
* 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 "pbd/failed_constructor.h"
#include "ardour/fluid_synth.h"
using namespace ARDOUR;
FluidSynth::FluidSynth (float samplerate, int polyphony)
: _settings (0)
, _synth (0)
, _f_midi_event (0)
{
_settings = new_fluid_settings ();
if (!_settings) {
throw failed_constructor ();
}
_f_midi_event = new_fluid_midi_event ();
if (!_f_midi_event) {
throw failed_constructor ();
}
fluid_settings_setnum (_settings, "synth.sample-rate", samplerate);
fluid_settings_setint (_settings, "synth.threadsafe-api", 0);
_synth = new_fluid_synth (_settings);
fluid_synth_set_gain (_synth, 1.0f);
fluid_synth_set_polyphony (_synth, polyphony);
fluid_synth_set_sample_rate (_synth, (float)samplerate);
}
FluidSynth::~FluidSynth ()
{
delete_fluid_synth (_synth);
delete_fluid_settings (_settings);
delete_fluid_midi_event (_f_midi_event);
}
bool
FluidSynth::load_sf2 (const std::string& fn)
{
_synth_id = fluid_synth_sfload (_synth, fn.c_str (), 1);
if (_synth_id == FLUID_FAILED) {
return false;
}
fluid_sfont_t* const sfont = fluid_synth_get_sfont_by_id (_synth, _synth_id);
if (!sfont) {
return false;
}
size_t count;
fluid_preset_t* preset;
fluid_sfont_iteration_start (sfont);
for (count = 0; (preset = fluid_sfont_iteration_next (sfont)) != 0; ++count) {
if (count < 16) {
fluid_synth_program_select (_synth, count, _synth_id, fluid_preset_get_banknum (preset), fluid_preset_get_num (preset));
}
_presets.push_back (BankProgram (
fluid_preset_get_name (preset),
fluid_preset_get_banknum (preset),
fluid_preset_get_num (preset)));
}
if (count == 0) {
return false;
}
/* bootstrap synth engine. The first call re-initializes the chorus
* (fluid_rvoice_mixer_set_samplerate) which is not rt-safe.
*/
float l[1024];
float r[1024];
fluid_synth_all_notes_off (_synth, -1);
fluid_synth_all_sounds_off (_synth, -1);
fluid_synth_write_float (_synth, 1024, l, 0, 1, r, 0, 1);
return true;
}
bool
FluidSynth::select_program (uint32_t pgm, uint8_t chan)
{
if (pgm >= _presets.size ()) {
return false;
}
const BankProgram& bp = _presets[pgm];
return FLUID_OK == fluid_synth_program_select (_synth, chan, _synth_id, bp.bank, bp.program);
}
void
FluidSynth::panic ()
{
fluid_synth_all_notes_off (_synth, -1);
fluid_synth_all_sounds_off (_synth, -1);
}
bool
FluidSynth::synth (float* left, float* right, uint32_t n_samples)
{
return FLUID_OK == fluid_synth_write_float (_synth, n_samples, left, 0, 1, right, 0, 1);
}
bool
FluidSynth::midi_event (uint8_t const* const data, size_t len)
{
if (len > 3) {
return false;
}
fluid_midi_event_set_type (_f_midi_event, data[0] & 0xf0);
fluid_midi_event_set_channel (_f_midi_event, data[0] & 0x0f);
if (len > 1) {
fluid_midi_event_set_key (_f_midi_event, data[1]);
}
if (len > 2) {
if (0xe0 /*PITCH_BEND*/ == fluid_midi_event_get_type (_f_midi_event)) {
fluid_midi_event_set_value (_f_midi_event, 0);
fluid_midi_event_set_pitch (_f_midi_event, ((data[2] & 0x7f) << 7) | (data[1] & 0x7f));
} else {
fluid_midi_event_set_value (_f_midi_event, data[2]);
}
}
return FLUID_OK == fluid_synth_handle_midi_event (_synth, _f_midi_event);
}