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/*
LV2 Fifths Example Plugin
Copyright 2014-2016 David Robillard <d@drobilla.net>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef __cplusplus
# include <stdbool.h>
#endif
#include "lv2/atom/util.h"
#include "lv2/core/lv2.h"
#include "lv2/core/lv2_util.h"
#include "lv2/log/logger.h"
#include "lv2/midi/midi.h"
#include "lv2/patch/patch.h"
#include "lv2/state/state.h"
#include "lv2/urid/urid.h"
#include "./uris.h"
enum {
FIFTHS_IN = 0,
FIFTHS_OUT = 1
};
typedef struct {
// Features
LV2_URID_Map* map;
LV2_Log_Logger logger;
// Ports
const LV2_Atom_Sequence* in_port;
LV2_Atom_Sequence* out_port;
// URIs
FifthsURIs uris;
} Fifths;
static void
connect_port(LV2_Handle instance,
uint32_t port,
void* data)
{
Fifths* self = (Fifths*)instance;
switch (port) {
case FIFTHS_IN:
self->in_port = (const LV2_Atom_Sequence*)data;
break;
case FIFTHS_OUT:
self->out_port = (LV2_Atom_Sequence*)data;
break;
default:
break;
}
}
static LV2_Handle
instantiate(const LV2_Descriptor* descriptor,
double rate,
const char* path,
const LV2_Feature* const* features)
{
// Allocate and initialise instance structure.
Fifths* self = (Fifths*)calloc(1, sizeof(Fifths));
if (!self) {
return NULL;
}
// Scan host features for URID map
const char* missing = lv2_features_query(
features,
LV2_LOG__log, &self->logger.log, false,
LV2_URID__map, &self->map, true,
NULL);
lv2_log_logger_set_map(&self->logger, self->map);
if (missing) {
lv2_log_error(&self->logger, "Missing feature <%s>\n", missing);
free(self);
return NULL;
}
map_fifths_uris(self->map, &self->uris);
return (LV2_Handle)self;
}
static void
cleanup(LV2_Handle instance)
{
free(instance);
}
static void
run(LV2_Handle instance,
uint32_t sample_count)
{
Fifths* self = (Fifths*)instance;
FifthsURIs* uris = &self->uris;
// Struct for a 3 byte MIDI event, used for writing notes
typedef struct {
LV2_Atom_Event event;
uint8_t msg[3];
} MIDINoteEvent;
// Initially self->out_port contains a Chunk with size set to capacity
// Get the capacity
const uint32_t out_capacity = self->out_port->atom.size;
// Write an empty Sequence header to the output
lv2_atom_sequence_clear(self->out_port);
self->out_port->atom.type = self->in_port->atom.type;
// Read incoming events
LV2_ATOM_SEQUENCE_FOREACH(self->in_port, ev) {
if (ev->body.type == uris->midi_Event) {
const uint8_t* const msg = (const uint8_t*)(ev + 1);
switch (lv2_midi_message_type(msg)) {
case LV2_MIDI_MSG_NOTE_ON:
case LV2_MIDI_MSG_NOTE_OFF:
// Forward note to output
lv2_atom_sequence_append_event(
self->out_port, out_capacity, ev);
if (msg[1] <= 127 - 7) {
// Make a note one 5th (7 semitones) higher than input
MIDINoteEvent fifth;
// Could simply do fifth.event = *ev here instead...
fifth.event.time.frames = ev->time.frames; // Same time
fifth.event.body.type = ev->body.type; // Same type
fifth.event.body.size = ev->body.size; // Same size
fifth.msg[0] = msg[0]; // Same status
fifth.msg[1] = msg[1] + 7; // Pitch up 7 semitones
fifth.msg[2] = msg[2]; // Same velocity
// Write 5th event
lv2_atom_sequence_append_event(
self->out_port, out_capacity, &fifth.event);
}
break;
default:
// Forward all other MIDI events directly
lv2_atom_sequence_append_event(
self->out_port, out_capacity, ev);
break;
}
}
}
}
static const void*
extension_data(const char* uri)
{
return NULL;
}
static const LV2_Descriptor descriptor = {
EG_FIFTHS_URI,
instantiate,
connect_port,
NULL, // activate,
run,
NULL, // deactivate,
cleanup,
extension_data
};
LV2_SYMBOL_EXPORT
const LV2_Descriptor* lv2_descriptor(uint32_t index)
{
switch (index) {
case 0:
return &descriptor;
default:
return NULL;
}
}
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