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livetrax/libs/plugins/a-fluidsynth.lv2/a-fluidsynth.c

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/* a-fluidsynth -- simple & robust x-platform fluidsynth LV2
*
* Copyright (C) 2016 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, 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define AFS_URN "urn:ardour:a-fluidsynth"
#ifdef HAVE_LV2_1_10_0
#define x_forge_object lv2_atom_forge_object
#else
#define x_forge_object lv2_atom_forge_blank
#endif
#include "fluidsynth.h"
#include <lv2/lv2plug.in/ns/lv2core/lv2.h>
#include <lv2/lv2plug.in/ns/ext/atom/atom.h>
#include <lv2/lv2plug.in/ns/ext/atom/forge.h>
#include <lv2/lv2plug.in/ns/ext/atom/util.h>
#include <lv2/lv2plug.in/ns/ext/log/logger.h>
#include <lv2/lv2plug.in/ns/ext/midi/midi.h>
#include <lv2/lv2plug.in/ns/ext/patch/patch.h>
#include <lv2/lv2plug.in/ns/ext/state/state.h>
#include <lv2/lv2plug.in/ns/ext/urid/urid.h>
#include <lv2/lv2plug.in/ns/ext/worker/worker.h>
enum {
FS_PORT_CONTROL = 0,
FS_PORT_NOTIFY,
FS_PORT_OUT_L,
FS_PORT_OUT_R,
FS_OUT_GAIN,
FS_REV_ENABLE,
FS_REV_ROOMSIZE,
FS_REV_DAMPING,
FS_REV_WIDTH,
FS_REV_LEVEL,
FS_CHR_ENABLE,
FS_CHR_N,
FS_CHR_SPEED,
FS_CHR_DEPTH,
FS_CHR_LEVEL,
FS_CHR_TYPE,
FS_PORT_LAST
};
enum {
CMD_APPLY = 0,
CMD_FREE = 1,
};
typedef struct {
/* ports */
const LV2_Atom_Sequence* control;
LV2_Atom_Sequence* notify;
float* p_ports[FS_PORT_LAST];
float v_ports[FS_PORT_LAST];
/* fluid synth */
fluid_settings_t* settings;
fluid_synth_t* synth;
int synthId;
/* lv2 URIDs */
LV2_URID atom_Blank;
LV2_URID atom_Object;
LV2_URID atom_URID;
LV2_URID atom_Path;
LV2_URID midi_MidiEvent;
LV2_URID patch_Get;
LV2_URID patch_Set;
LV2_URID patch_property;
LV2_URID patch_value;
LV2_URID afs_sf2file;
/* lv2 extensions */
LV2_Log_Log* log;
LV2_Log_Logger logger;
LV2_Worker_Schedule* schedule;
LV2_Atom_Forge forge;
LV2_Atom_Forge_Frame frame;
/* state */
bool panic;
bool initialized;
bool inform_ui;
char current_sf2_file_path[1024];
char queue_sf2_file_path[1024];
bool reinit_in_progress; // set in run, cleared in work_response
bool queue_reinit; // set in restore, cleared in work_response
fluid_midi_event_t* fmidi_event;
} AFluidSynth;
/* *****************************************************************************
* helpers
*/
static bool
load_sf2 (AFluidSynth* self, const char* fn)
{
const int synth_id = fluid_synth_sfload (self->synth, fn, 1);
if (synth_id == FLUID_FAILED) {
return false;
}
fluid_sfont_t* const sfont = fluid_synth_get_sfont_by_id (self->synth, synth_id);
if (!sfont) {
return false;
}
int chn;
fluid_preset_t preset;
sfont->iteration_start (sfont);
for (chn = 0; sfont->iteration_next (sfont, &preset) && chn < 15; ++chn) {
fluid_synth_program_select (self->synth, chn, synth_id,
preset.get_banknum (&preset), preset.get_num (&preset));
}
if (chn == 0) {
return false;
}
return true;
}
static const LV2_Atom*
parse_patch_msg (AFluidSynth* self, const LV2_Atom_Object* obj)
{
const LV2_Atom* property = NULL;
const LV2_Atom* file_path = NULL;
if (obj->body.otype != self->patch_Set) {
return NULL;
}
lv2_atom_object_get (obj, self->patch_property, &property, 0);
if (!property || property->type != self->atom_URID) {
return NULL;
} else if (((const LV2_Atom_URID*)property)->body != self->afs_sf2file) {
return NULL;
}
lv2_atom_object_get (obj, self->patch_value, &file_path, 0);
if (!file_path || file_path->type != self->atom_Path) {
return NULL;
}
return file_path;
}
static void
inform_ui (AFluidSynth* self)
{
if (strlen (self->current_sf2_file_path) == 0) {
return;
}
LV2_Atom_Forge_Frame frame;
lv2_atom_forge_frame_time (&self->forge, 0);
x_forge_object (&self->forge, &frame, 1, self->patch_Set);
lv2_atom_forge_property_head (&self->forge, self->patch_property, 0);
lv2_atom_forge_urid (&self->forge, self->afs_sf2file);
lv2_atom_forge_property_head (&self->forge, self->patch_value, 0);
lv2_atom_forge_path (&self->forge, self->current_sf2_file_path, strlen (self->current_sf2_file_path));
lv2_atom_forge_pop (&self->forge, &frame);
}
static float
db_to_coeff (float db)
{
if (db <= -80) { return 0; }
else if (db >= 20) { return 10; }
return powf (10.f, .05f * db);
}
/* *****************************************************************************
* LV2 Plugin
*/
static LV2_Handle
instantiate (const LV2_Descriptor* descriptor,
double rate,
const char* bundle_path,
const LV2_Feature* const* features)
{
AFluidSynth* self = (AFluidSynth*)calloc (1, sizeof (AFluidSynth));
if (!self) {
return NULL;
}
LV2_URID_Map* map = NULL;
for (int i=0; features[i] != NULL; ++i) {
if (!strcmp (features[i]->URI, LV2_URID__map)) {
map = (LV2_URID_Map*)features[i]->data;
} else if (!strcmp (features[i]->URI, LV2_LOG__log)) {
self->log = (LV2_Log_Log*)features[i]->data;
} else if (!strcmp (features[i]->URI, LV2_WORKER__schedule)) {
self->schedule = (LV2_Worker_Schedule*)features[i]->data;
}
}
lv2_log_logger_init (&self->logger, map, self->log);
if (!map) {
lv2_log_error (&self->logger, "a-fluidsynth.lv2: Host does not support urid:map\n");
free (self);
return NULL;
}
if (!self->schedule) {
lv2_log_error (&self->logger, "a-fluidsynth.lv2: Host does not support worker:schedule\n");
free (self);
return NULL;
}
/* initialize fluid synth */
self->settings = new_fluid_settings ();
if (!self->settings) {
lv2_log_error (&self->logger, "a-fluidsynth.lv2: cannot allocate Fluid Settings\n");
free (self);
return NULL;
}
fluid_settings_setnum (self->settings, "synth.sample-rate", rate);
fluid_settings_setint (self->settings, "synth.parallel-render", 1);
fluid_settings_setint (self->settings, "synth.threadsafe-api", 0);
self->synth = new_fluid_synth (self->settings);
if (!self->synth) {
lv2_log_error (&self->logger, "a-fluidsynth.lv2: cannot allocate Fluid Synth\n");
delete_fluid_settings (self->settings);
free (self);
return NULL;
}
fluid_synth_set_gain (self->synth, 1.0f);
fluid_synth_set_polyphony (self->synth, 32);
fluid_synth_set_sample_rate (self->synth, (float)rate);
self->fmidi_event = new_fluid_midi_event ();
if (!self->fmidi_event) {
lv2_log_error (&self->logger, "a-fluidsynth.lv2: cannot allocate Fluid Event\n");
delete_fluid_synth (self->synth);
delete_fluid_settings (self->settings);
free (self);
return NULL;
}
/* initialize plugin state */
self->panic = false;
self->inform_ui = false;
self->initialized = false;
self->reinit_in_progress = false;
self->queue_reinit = false;
lv2_atom_forge_init (&self->forge, map);
/* map URIDs */
self->atom_Blank = map->map (map->handle, LV2_ATOM__Blank);
self->atom_Object = map->map (map->handle, LV2_ATOM__Object);
self->atom_Path = map->map (map->handle, LV2_ATOM__Path);
self->atom_URID = map->map (map->handle, LV2_ATOM__URID);
self->midi_MidiEvent = map->map (map->handle, LV2_MIDI__MidiEvent);
self->patch_Get = map->map (map->handle, LV2_PATCH__Get);
self->patch_Set = map->map (map->handle, LV2_PATCH__Set);
self->patch_property = map->map (map->handle, LV2_PATCH__property);
self->patch_value = map->map (map->handle, LV2_PATCH__value);
self->afs_sf2file = map->map (map->handle, AFS_URN ":sf2file");
return (LV2_Handle)self;
}
static void
connect_port (LV2_Handle instance,
uint32_t port,
void* data)
{
AFluidSynth* self = (AFluidSynth*)instance;
switch (port) {
case FS_PORT_CONTROL:
self->control = (const LV2_Atom_Sequence*)data;
break;
case FS_PORT_NOTIFY:
self->notify = (LV2_Atom_Sequence*)data;
break;
default:
if (port < FS_PORT_LAST) {
self->p_ports[port] = (float*)data;
}
break;
}
}
static void
deactivate (LV2_Handle instance)
{
AFluidSynth* self = (AFluidSynth*)instance;
self->panic = true;
}
static void
run (LV2_Handle instance, uint32_t n_samples)
{
AFluidSynth* self = (AFluidSynth*)instance;
if (!self->control || !self->notify) {
return;
}
const uint32_t capacity = self->notify->atom.size;
lv2_atom_forge_set_buffer (&self->forge, (uint8_t*)self->notify, capacity);
lv2_atom_forge_sequence_head (&self->forge, &self->frame, 0);
if (!self->initialized || self->reinit_in_progress) {
memset (self->p_ports[FS_PORT_OUT_L], 0, n_samples * sizeof (float));
memset (self->p_ports[FS_PORT_OUT_R], 0, n_samples * sizeof (float));
} else if (self->panic) {
fluid_synth_all_notes_off (self->synth, -1);
fluid_synth_all_sounds_off (self->synth, -1);
self->panic = false;
}
if (self->initialized && !self->reinit_in_progress) {
bool rev_change = false;
bool chr_change = false;
// TODO clamp values to ranges
if (self->v_ports[FS_OUT_GAIN] != *self->p_ports[FS_OUT_GAIN]) {
fluid_synth_set_gain (self->synth, db_to_coeff (*self->p_ports[FS_OUT_GAIN]));
}
if (self->v_ports[FS_REV_ENABLE] != *self->p_ports[FS_REV_ENABLE]) {
fluid_synth_set_reverb_on (self->synth, *self->p_ports[FS_REV_ENABLE] > 0 ? 1 : 0);
rev_change = true;
}
if (self->v_ports[FS_CHR_ENABLE] != *self->p_ports[FS_CHR_ENABLE]) {
fluid_synth_set_chorus_on (self->synth, *self->p_ports[FS_CHR_ENABLE] > 0 ? 1 : 0);
chr_change = true;
}
for (uint32_t p = FS_REV_ROOMSIZE; p <= FS_REV_LEVEL && !rev_change; ++p) {
if (self->v_ports[p] != *self->p_ports[p]) {
rev_change = true;
}
}
for (uint32_t p = FS_CHR_N; p <= FS_CHR_TYPE && !chr_change; ++p) {
if (self->v_ports[p] != *self->p_ports[p]) {
chr_change = true;
}
}
if (rev_change) {
fluid_synth_set_reverb (self->synth,
*self->p_ports[FS_REV_ROOMSIZE],
*self->p_ports[FS_REV_DAMPING],
*self->p_ports[FS_REV_WIDTH],
*self->p_ports[FS_REV_LEVEL]);
}
if (chr_change) {
fluid_synth_set_chorus (self->synth,
rintf (*self->p_ports[FS_CHR_N]),
db_to_coeff (*self->p_ports[FS_CHR_LEVEL]),
*self->p_ports[FS_CHR_SPEED],
*self->p_ports[FS_CHR_DEPTH],
(*self->p_ports[FS_CHR_TYPE] > 0) ? FLUID_CHORUS_MOD_SINE : FLUID_CHORUS_MOD_TRIANGLE);
}
for (uint32_t p = FS_OUT_GAIN; p < FS_PORT_LAST; ++p) {
self->v_ports[p] = *self->p_ports[p];
}
}
uint32_t offset = 0;
LV2_ATOM_SEQUENCE_FOREACH (self->control, ev) {
const LV2_Atom_Object* obj = (LV2_Atom_Object*)&ev->body;
if (ev->body.type == self->atom_Blank || ev->body.type == self->atom_Object) {
if (obj->body.otype == self->patch_Get) {
self->inform_ui = false;
inform_ui (self);
}
else if (obj->body.otype == self->patch_Set) {
const LV2_Atom* file_path = parse_patch_msg (self, obj);
if (file_path && !self->reinit_in_progress && !self->queue_reinit) {
const char *fn = (const char*)(file_path+1);
strncpy (self->queue_sf2_file_path, fn, 1023);
self->queue_sf2_file_path[1023] = '\0';
self->reinit_in_progress = true;
int magic = 0x4711;
self->schedule->schedule_work (self->schedule->handle, sizeof (int), &magic);
}
}
}
else if (ev->body.type == self->midi_MidiEvent && self->initialized && !self->reinit_in_progress) {
if (ev->body.size > 3 || ev->time.frames >= n_samples) {
continue;
}
if (ev->time.frames > offset) {
fluid_synth_write_float (
self->synth,
ev->time.frames - offset,
&self->p_ports[FS_PORT_OUT_L][offset], 0, 1,
&self->p_ports[FS_PORT_OUT_R][offset], 0, 1);
}
offset = ev->time.frames;
const uint8_t* const data = (const uint8_t*)(ev + 1);
fluid_midi_event_set_type (self->fmidi_event, data[0] & 0xf0);
fluid_midi_event_set_channel (self->fmidi_event, data[0] & 0x0f);
if (ev->body.size > 1) {
fluid_midi_event_set_key (self->fmidi_event, data[1]);
}
if (ev->body.size > 2) {
fluid_midi_event_set_value (self->fmidi_event, data[2]);
}
fluid_synth_handle_midi_event (self->synth, self->fmidi_event);
}
}
if (self->queue_reinit && !self->reinit_in_progress) {
self->reinit_in_progress = true;
int magic = 0x4711;
self->schedule->schedule_work (self->schedule->handle, sizeof (int), &magic);
}
/* inform the GUI */
if (self->inform_ui) {
self->inform_ui = false;
inform_ui (self);
}
if (n_samples > offset && self->initialized && !self->reinit_in_progress) {
fluid_synth_write_float (
self->synth,
n_samples - offset,
&self->p_ports[FS_PORT_OUT_L][offset], 0, 1,
&self->p_ports[FS_PORT_OUT_R][offset], 0, 1);
}
}
static void cleanup (LV2_Handle instance)
{
AFluidSynth* self = (AFluidSynth*)instance;
delete_fluid_synth (self->synth);
delete_fluid_settings (self->settings);
delete_fluid_midi_event (self->fmidi_event);
free (self);
}
/* *****************************************************************************
* LV2 Extensions
*/
static LV2_Worker_Status
work (LV2_Handle instance,
LV2_Worker_Respond_Function respond,
LV2_Worker_Respond_Handle handle,
uint32_t size,
const void* data)
{
AFluidSynth* self = (AFluidSynth*)instance;
if (size != sizeof (int)) {
return LV2_WORKER_ERR_UNKNOWN;
}
int magic = *((const int*)data);
if (magic != 0x4711) {
return LV2_WORKER_ERR_UNKNOWN;
}
self->initialized = load_sf2 (self, self->queue_sf2_file_path);
if (self->initialized) {
fluid_synth_all_notes_off (self->synth, -1);
fluid_synth_all_sounds_off (self->synth, -1);
self->panic = false;
// boostrap synth engine.
float l[1024];
float r[1024];
fluid_synth_write_float (self->synth, 1024, l, 0, 1, r, 0, 1);
}
respond (handle, 1, "");
return LV2_WORKER_SUCCESS;
}
static LV2_Worker_Status
work_response (LV2_Handle instance,
uint32_t size,
const void* data)
{
AFluidSynth* self = (AFluidSynth*)instance;
if (self->initialized) {
strcpy (self->current_sf2_file_path, self->queue_sf2_file_path);
} else {
self->current_sf2_file_path[0] = 0;
}
self->reinit_in_progress = false;
self->inform_ui = true;
self->queue_reinit = false;
return LV2_WORKER_SUCCESS;
}
static LV2_State_Status
save (LV2_Handle instance,
LV2_State_Store_Function store,
LV2_State_Handle handle,
uint32_t flags,
const LV2_Feature* const* features)
{
AFluidSynth* self = (AFluidSynth*)instance;
if (strlen (self->current_sf2_file_path) == 0) {
return LV2_STATE_ERR_NO_PROPERTY;
}
LV2_State_Map_Path* map_path = NULL;
for (int i = 0; features[i]; ++i) {
if (!strcmp (features[i]->URI, LV2_STATE__mapPath)) {
map_path = (LV2_State_Map_Path*) features[i]->data;
}
}
if (!map_path) {
return LV2_STATE_ERR_NO_FEATURE;
}
char* apath = map_path->abstract_path (map_path->handle, self->current_sf2_file_path);
store (handle, self->afs_sf2file,
apath, strlen (apath) + 1,
self->atom_Path,
LV2_STATE_IS_POD | LV2_STATE_IS_PORTABLE);
return LV2_STATE_SUCCESS;
}
static LV2_State_Status
restore (LV2_Handle instance,
LV2_State_Retrieve_Function retrieve,
LV2_State_Handle handle,
uint32_t flags,
const LV2_Feature* const* features)
{
AFluidSynth* self = (AFluidSynth*)instance;
if (self->reinit_in_progress || self->queue_reinit) {
lv2_log_warning (&self->logger, "a-fluidsynth.lv2: sf2 load already queued.\n");
return LV2_STATE_ERR_UNKNOWN;
}
size_t size;
uint32_t type;
uint32_t valflags;
const void* value = retrieve (handle, self->afs_sf2file, &size, &type, &valflags);
if (value) {
strncpy (self->queue_sf2_file_path, value, 1023);
self->queue_sf2_file_path[1023] = '\0';
self->queue_reinit = true;
}
return LV2_STATE_SUCCESS;
}
static const void*
extension_data (const char* uri)
{
static const LV2_Worker_Interface worker = { work, work_response, NULL };
static const LV2_State_Interface state = { save, restore };
if (!strcmp (uri, LV2_WORKER__interface)) {
return &worker;
}
else if (!strcmp (uri, LV2_STATE__interface)) {
return &state;
}
return NULL;
}
static const LV2_Descriptor descriptor = {
AFS_URN,
instantiate,
connect_port,
NULL,
run,
deactivate,
cleanup,
extension_data
};
#undef LV2_SYMBOL_EXPORT
#ifdef _WIN32
# define LV2_SYMBOL_EXPORT __declspec(dllexport)
#else
# define LV2_SYMBOL_EXPORT __attribute__ ((visibility ("default")))
#endif
LV2_SYMBOL_EXPORT
const LV2_Descriptor*
lv2_descriptor (uint32_t index)
{
switch (index) {
case 0:
return &descriptor;
default:
return NULL;
}
}
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