1 /* reasonable simple synth
3 * Copyright (C) 2013 Robin Gareus <robin@gareus.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include "lv2/lv2plug.in/ns/lv2core/lv2.h"
28 #include "lv2/lv2plug.in/ns/ext/atom/atom.h"
29 #include "lv2/lv2plug.in/ns/ext/urid/urid.h"
30 #include "lv2/lv2plug.in/ns/ext/midi/midi.h"
32 #define RSY_URI "https://community.ardour.org/node/7596"
34 /* the synth interface */
35 static void * synth_alloc (void);
36 static void synth_init (void *, double rate);
37 static void synth_free (void *);
38 static void synth_parse_midi (void *, const uint8_t *data, const size_t size);
39 static uint32_t synth_sound (void *, uint32_t written, uint32_t nframes, float **out);
50 const LV2_Atom_Sequence* midiin;
55 LV2_URID midi_MidiEvent;
64 instantiate(const LV2_Descriptor* descriptor,
66 const char* bundle_path,
67 const LV2_Feature* const* features)
69 (void) descriptor; /* unused variable */
70 (void) bundle_path; /* unused variable */
73 fprintf(stderr, "RSynth.lv2 error: unsupported sample-rate (must be > 8k)\n");
76 RSynth* self = (RSynth*)calloc(1, sizeof(RSynth));
81 self->SampleRateD = rate;
84 for (i=0; features[i]; ++i) {
85 if (!strcmp(features[i]->URI, LV2_URID__map)) {
86 self->map = (LV2_URID_Map*)features[i]->data;
91 fprintf(stderr, "RSynth.lv2 error: Host does not support urid:map\n");
96 self->midi_MidiEvent = self->map->map(self->map->handle, LV2_MIDI__MidiEvent);
98 self->synth = synth_alloc();
99 synth_init(self->synth, rate);
101 return (LV2_Handle)self;
105 connect_port(LV2_Handle handle,
109 RSynth* self = (RSynth*)handle;
111 switch ((PortIndex)port) {
113 self->midiin = (const LV2_Atom_Sequence*)data;
116 self->outL = (float*)data;
119 self->outR = (float*)data;
125 run(LV2_Handle handle, uint32_t n_samples)
127 RSynth* self = (RSynth*)handle;
130 audio[0] = self->outL;
131 audio[1] = self->outR;
133 uint32_t written = 0;
135 /* Process incoming MIDI events */
137 LV2_Atom_Event const* ev = (LV2_Atom_Event const*)((&(self->midiin)->body) + 1); // lv2_atom_sequence_begin
138 while( // !lv2_atom_sequence_is_end
139 (const uint8_t*)ev < ((const uint8_t*) &(self->midiin)->body + (self->midiin)->atom.size)
142 if (ev->body.type == self->midi_MidiEvent) {
143 if (written + BUFFER_SIZE_SAMPLES < ev->time.frames
144 && ev->time.frames < n_samples) {
145 /* first synthesize sound up until the message timestamp */
146 written = synth_sound(self->synth, written, ev->time.frames, audio);
148 /* send midi message to synth */
149 synth_parse_midi(self->synth, (const uint8_t*)(ev+1), ev->body.size);
151 ev = (LV2_Atom_Event const*) // lv2_atom_sequence_next()
152 ((const uint8_t*)ev + sizeof(LV2_Atom_Event) + ((ev->body.size + 7) & ~7));
156 /* synthesize [remaining] sound */
157 synth_sound(self->synth, written, n_samples, audio);
161 cleanup(LV2_Handle handle)
163 RSynth* self = (RSynth*)handle;
164 synth_free(self->synth);
169 extension_data(const char* uri)
171 (void) uri; /* unused variable */
175 static const LV2_Descriptor descriptor = {
187 const LV2_Descriptor*
188 lv2_descriptor(uint32_t index)
198 /* vi:set ts=8 sts=2 sw=2 et: */