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.
28 #include "lv2/lv2plug.in/ns/lv2core/lv2.h"
29 #include "lv2/lv2plug.in/ns/ext/atom/atom.h"
30 #include "lv2/lv2plug.in/ns/ext/urid/urid.h"
31 #include "lv2/lv2plug.in/ns/ext/midi/midi.h"
33 #define RSY_URI "https://community.ardour.org/node/7596"
35 /* the synth interface */
36 static void * synth_alloc (void);
37 static void synth_init (void *, double rate);
38 static void synth_free (void *);
39 static void synth_parse_midi (void *, const uint8_t *data, const size_t size);
40 static uint32_t synth_sound (void *, uint32_t written, uint32_t nframes, float **out);
51 const LV2_Atom_Sequence* midiin;
56 LV2_URID midi_MidiEvent;
66 instantiate(const LV2_Descriptor* descriptor,
68 const char* bundle_path,
69 const LV2_Feature* const* features)
71 (void) descriptor; /* unused variable */
72 (void) bundle_path; /* unused variable */
75 fprintf(stderr, "RSynth.lv2 error: unsupported sample-rate (must be > 8k)\n");
78 RSynth* self = (RSynth*)calloc(1, sizeof(RSynth));
83 self->SampleRateD = rate;
86 for (i=0; features[i]; ++i) {
87 if (!strcmp(features[i]->URI, LV2_URID__map)) {
88 self->map = (LV2_URID_Map*)features[i]->data;
93 fprintf(stderr, "RSynth.lv2 error: Host does not support urid:map\n");
98 self->midi_MidiEvent = self->map->map(self->map->handle, LV2_MIDI__MidiEvent);
100 self->synth = synth_alloc();
101 synth_init(self->synth, rate);
107 localtime_r(&now, &date);
108 if (getenv("ITSXMAS") || (date.tm_mon == 11 /*dec*/ && date.tm_mday == 25)) {
109 printf("reasonable synth.lv2 says: happy holidays!\n");
113 return (LV2_Handle)self;
117 connect_port(LV2_Handle handle,
121 RSynth* self = (RSynth*)handle;
123 switch ((PortIndex)port) {
125 self->midiin = (const LV2_Atom_Sequence*)data;
128 self->outL = (float*)data;
131 self->outR = (float*)data;
137 run(LV2_Handle handle, uint32_t n_samples)
139 RSynth* self = (RSynth*)handle;
142 audio[0] = self->outL;
143 audio[1] = self->outR;
145 uint32_t written = 0;
147 /* Process incoming MIDI events */
149 LV2_Atom_Event const* ev = (LV2_Atom_Event const*)((&(self->midiin)->body) + 1); // lv2_atom_sequence_begin
150 while( // !lv2_atom_sequence_is_end
151 (const uint8_t*)ev < ((const uint8_t*) &(self->midiin)->body + (self->midiin)->atom.size)
154 if (ev->body.type == self->midi_MidiEvent) {
155 if (written + BUFFER_SIZE_SAMPLES < ev->time.frames
156 && ev->time.frames < n_samples) {
157 /* first synthesize sound up until the message timestamp */
158 written = synth_sound(self->synth, written, ev->time.frames, audio);
160 /* send midi message to synth */
162 synth_parse_xmas(self->synth, (const uint8_t*)(ev+1), ev->body.size);
164 synth_parse_midi(self->synth, (const uint8_t*)(ev+1), ev->body.size);
167 ev = (LV2_Atom_Event const*) // lv2_atom_sequence_next()
168 ((const uint8_t*)ev + sizeof(LV2_Atom_Event) + ((ev->body.size + 7) & ~7));
172 /* synthesize [remaining] sound */
173 synth_sound(self->synth, written, n_samples, audio);
177 cleanup(LV2_Handle handle)
179 RSynth* self = (RSynth*)handle;
180 synth_free(self->synth);
185 extension_data(const char* uri)
187 (void) uri; /* unused variable */
191 static const LV2_Descriptor descriptor = {
203 const LV2_Descriptor*
204 lv2_descriptor(uint32_t idx)
214 /* vi:set ts=8 sts=2 sw=2 et: */