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-rw-r--r--plugins/eg06-fifths.lv2/fifths.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/plugins/eg06-fifths.lv2/fifths.c b/plugins/eg06-fifths.lv2/fifths.c
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+++ b/plugins/eg06-fifths.lv2/fifths.c
@@ -0,0 +1,191 @@
+/*
+ LV2 Fifths Example Plugin
+ Copyright 2014 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 <stdlib.h>
+#include <string.h>
+#ifndef __cplusplus
+# include <stdbool.h>
+#endif
+
+#include <sndfile.h>
+
+#include "lv2/lv2plug.in/ns/ext/atom/util.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/lv2core/lv2.h"
+
+#include "./uris.h"
+
+enum {
+ FIFTHS_IN = 0,
+ FIFTHS_OUT = 1
+};
+
+typedef struct {
+ // Features
+ LV2_URID_Map* map;
+
+ // 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*)malloc(sizeof(Fifths));
+ if (!self) {
+ return NULL;
+ }
+ memset(self, 0, sizeof(Fifths));
+
+ // Get host features
+ for (int i = 0; features[i]; ++i) {
+ if (!strcmp(features[i]->URI, LV2_URID__map)) {
+ self->map = (LV2_URID_Map*)features[i]->data;
+ }
+ }
+ if (!self->map) {
+ fprintf(stderr, "Missing feature urid:map\n");
+ free(self);
+ return NULL;
+ }
+
+ // Map URIs and initialise forge/logger
+ 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);
+
+ const uint8_t note = msg[1];
+ if (note < 127 - 7) {
+ // Make a note one 5th (7 semitones) higher than input
+ MIDINoteEvent fifth;
+ fifth.event = *ev;
+ 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;
+ }
+}