147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
/*
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* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "pbd/failed_constructor.h"
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#include "ardour/fluid_synth.h"
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using namespace ARDOUR;
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FluidSynth::FluidSynth (float samplerate, int polyphony)
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: _settings (0)
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, _synth (0)
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, _f_midi_event (0)
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{
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_settings = new_fluid_settings ();
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if (!_settings) {
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throw failed_constructor ();
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}
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_f_midi_event = new_fluid_midi_event ();
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if (!_f_midi_event) {
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throw failed_constructor ();
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}
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fluid_settings_setnum (_settings, "synth.sample-rate", samplerate);
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fluid_settings_setint (_settings, "synth.parallel-render", 1);
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fluid_settings_setint (_settings, "synth.threadsafe-api", 0);
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_synth = new_fluid_synth (_settings);
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fluid_synth_set_gain (_synth, 1.0f);
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fluid_synth_set_polyphony (_synth, polyphony);
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fluid_synth_set_sample_rate (_synth, (float)samplerate);
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}
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FluidSynth::~FluidSynth ()
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{
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delete_fluid_synth (_synth);
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delete_fluid_settings (_settings);
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delete_fluid_midi_event (_f_midi_event);
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}
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bool
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FluidSynth::load_sf2 (const std::string& fn)
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{
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_synth_id = fluid_synth_sfload (_synth, fn.c_str (), 1);
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if (_synth_id == FLUID_FAILED) {
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return false;
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}
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fluid_sfont_t* const sfont = fluid_synth_get_sfont_by_id (_synth, _synth_id);
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if (!sfont) {
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return false;
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}
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size_t count;
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fluid_preset_t preset;
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sfont->iteration_start (sfont);
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for (count = 0; sfont->iteration_next (sfont, &preset) != 0; ++count) {
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if (count < 16) {
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fluid_synth_program_select (_synth, count, _synth_id, preset.get_banknum (&preset), preset.get_num (&preset));
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}
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_presets.push_back (BankProgram (
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preset.get_name (&preset),
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preset.get_banknum (&preset),
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preset.get_num (&preset)));
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}
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if (count == 0) {
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return false;
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}
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/* boostrap synth engine. The first call re-initializes the chorus
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* (fluid_rvoice_mixer_set_samplerate) which is not rt-safe.
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*/
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float l[1024];
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float r[1024];
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fluid_synth_all_notes_off (_synth, -1);
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fluid_synth_all_sounds_off (_synth, -1);
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fluid_synth_write_float (_synth, 1024, l, 0, 1, r, 0, 1);
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return true;
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}
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bool
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FluidSynth::select_program (uint32_t pgm, uint8_t chan)
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{
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if (pgm >= _presets.size ()) {
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return false;
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}
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const BankProgram& bp = _presets[pgm];
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return FLUID_OK == fluid_synth_program_select (_synth, chan, _synth_id, bp.bank, bp.program);
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}
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void
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FluidSynth::panic ()
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{
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fluid_synth_all_notes_off (_synth, -1);
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fluid_synth_all_sounds_off (_synth, -1);
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}
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bool
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FluidSynth::synth (float* left, float* right, uint32_t n_samples)
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{
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return FLUID_OK == fluid_synth_write_float (_synth, n_samples, left, 0, 1, right, 0, 1);
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}
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bool
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FluidSynth::midi_event (uint8_t const* const data, size_t len)
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{
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if (len > 3) {
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return false;
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}
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fluid_midi_event_set_type (_f_midi_event, data[0] & 0xf0);
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fluid_midi_event_set_channel (_f_midi_event, data[0] & 0x0f);
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if (len > 1) {
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fluid_midi_event_set_key (_f_midi_event, data[1]);
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}
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if (len > 2) {
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if (0xe0 /*PITCH_BEND*/ == fluid_midi_event_get_type (_f_midi_event)) {
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fluid_midi_event_set_value (_f_midi_event, 0);
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fluid_midi_event_set_pitch (_f_midi_event, ((data[2] & 0x7f) << 7) | (data[1] & 0x7f));
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} else {
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fluid_midi_event_set_value (_f_midi_event, data[2]);
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}
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}
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return FLUID_OK == fluid_synth_handle_midi_event (_synth, _f_midi_event);
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}
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