Expose voice detune parameter of the lv2 plugin
[zyn.git] / lv2-midifunctions.h
blobdf8acb78c8060df0675bcb58d426759c966e6d01
1 /****************************************************************************
3 lv2-midifunctions.h - support file for using MIDI in LV2 plugins
5 Copyright (C) 2006 Lars Luthman <lars.luthman@gmail.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 01222-1307 USA
21 ****************************************************************************/
23 #ifndef LV2_MIDIFUNCTIONS
24 #define LV2_MIDIFUNCTIONS
26 #include "lv2-miditype.h"
29 typedef struct {
30 const LV2_MIDI* midi;
31 uint32_t frame_count;
32 uint32_t position;
33 } LV2_MIDIState;
36 static double lv2midi_get_event(LV2_MIDIState* state,
37 double* timestamp,
38 uint32_t* size,
39 unsigned char** data) {
41 if (state->position >= state->midi->size) {
42 state->position = state->midi->size;
43 *timestamp = state->frame_count;
44 *size = 0;
45 *data = NULL;
46 return *timestamp;
49 *timestamp = *(double*)(state->midi->data + state->position);
50 *size = *(size_t*)(state->midi->data + state->position + sizeof(double));
51 *data = state->midi->data + state->position +
52 sizeof(double) + sizeof(size_t);
53 return *timestamp;
57 static double lv2midi_step(LV2_MIDIState* state) {
59 if (state->position >= state->midi->size) {
60 state->position = state->midi->size;
61 return state->frame_count;
64 state->position += sizeof(double);
65 size_t size = *(size_t*)(state->midi->data + state->position);
66 state->position += sizeof(size_t);
67 state->position += size;
68 return *(double*)(state->midi->data + state->position);
72 #endif