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-rw-r--r--examples/hosts/host.c341
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diff --git a/examples/hosts/host.c b/examples/hosts/host.c
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+++ b/examples/hosts/host.c
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+/* LibSLV2 Jack Example Host
+ * Copyright (C) 2006 Dave Robillard <drobilla@connect.carleton.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <slv2/slv2.h>
+#include <jack/jack.h>
+
+#define WITH_MIDI 1
+#define MIDI_BUFFER_SIZE 1024
+
+#ifdef WITH_MIDI
+#include <jack/midiport.h>
+#include "lv2-miditype.h"
+#include "lv2-midifunctions.h"
+#endif // WITH_MIDI
+
+struct Port {
+ enum Direction { INPUT, OUTPUT} direction;
+ enum Type { UNKNOWN, FLOAT, MIDI } type;
+
+ jack_port_t* jack_port; /**< For audio and MIDI ports, otherwise NULL */
+ float control; /**< For control ports, otherwise 0.0f */
+ LV2_MIDI* midi_buffer; /**< For midi ports, otherwise NULL */
+};
+
+
+/** This program's data */
+struct JackHost {
+ jack_client_t* jack_client; /**< Jack client */
+ SLV2Plugin* plugin; /**< Plugin "class" (actually just a few strings) */
+ SLV2Instance* instance; /**< Plugin "instance" (loaded shared lib) */
+ uint32_t num_ports; /**< Size of the two following arrays: */
+ struct Port* ports; /** Port array of size num_ports */
+};
+
+
+void die(const char* msg);
+void create_port(struct JackHost* host, uint32_t port_index);
+int jack_process_cb(jack_nframes_t nframes, void* data);
+void list_plugins(SLV2List list);
+
+
+int
+main(int argc, char** argv)
+{
+ struct JackHost host;
+ host.jack_client = NULL;
+ host.num_ports = 0;
+ host.ports = NULL;
+
+ /* Find all installed plugins */
+ SLV2List plugins = slv2_list_new();
+ slv2_list_load_all(plugins);
+ //slv2_list_load_bundle(plugins, "http://www.scs.carleton.ca/~drobilla/files/Amp-swh.lv2");
+
+ /* Find the plugin to run */
+ const char* plugin_uri = (argc == 2) ? argv[1] : NULL;
+
+ if (!plugin_uri) {
+ fprintf(stderr, "\nYou must specify a plugin URI to load.\n");
+ fprintf(stderr, "\nKnown plugins:\n\n");
+ list_plugins(plugins);
+ return EXIT_FAILURE;
+ }
+
+ printf("URI:\t%s\n", plugin_uri);
+ host.plugin = slv2_list_get_plugin_by_uri(plugins, plugin_uri);
+
+ if (!host.plugin) {
+ fprintf(stderr, "Failed to find plugin %s.\n", plugin_uri);
+ slv2_list_free(plugins);
+ return EXIT_FAILURE;
+ }
+
+ /* Get the plugin's name */
+ char* name = slv2_plugin_get_name(host.plugin);
+ printf("Name:\t%s\n", name);
+
+ /* Connect to JACK (with plugin name as client name) */
+ host.jack_client = jack_client_open(name, JackNullOption, NULL);
+ free(name);
+ if (!host.jack_client)
+ die("Failed to connect to JACK.");
+ else
+ printf("Connected to JACK.\n");
+
+ /* Instantiate the plugin */
+ host.instance = slv2_plugin_instantiate(
+ host.plugin, jack_get_sample_rate(host.jack_client), NULL);
+ if (!host.instance)
+ die("Failed to instantiate plugin.\n");
+ else
+ printf("Succesfully instantiated plugin.\n");
+
+ jack_set_process_callback(host.jack_client, &jack_process_cb, (void*)(&host));
+
+ /* Create ports */
+ host.num_ports = slv2_plugin_get_num_ports(host.plugin);
+ host.ports = calloc((size_t)host.num_ports, sizeof(struct Port));
+
+ for (uint32_t i=0; i < host.num_ports; ++i)
+ create_port(&host, i);
+
+ /* Activate plugin and JACK */
+ slv2_instance_activate(host.instance);
+ jack_activate(host.jack_client);
+
+ /* Run */
+ printf("Press enter to quit: ");
+ getc(stdin);
+ printf("\n");
+
+ /* Deactivate plugin and JACK */
+ slv2_instance_free(host.instance);
+ slv2_list_free(plugins);
+
+ printf("Shutting down JACK.\n");
+ for (unsigned long i=0; i < host.num_ports; ++i) {
+ if (host.ports[i].jack_port != NULL) {
+ jack_port_unregister(host.jack_client, host.ports[i].jack_port);
+ host.ports[i].jack_port = NULL;
+ }
+ if (host.ports[i].midi_buffer != NULL) {
+ lv2midi_free(host.ports[i].midi_buffer);
+ }
+ }
+ jack_client_close(host.jack_client);
+
+ return 0;
+}
+
+
+/** Abort and exit on error */
+void
+die(const char* msg)
+{
+ fprintf(stderr, "%s\n", msg);
+ exit(EXIT_FAILURE);
+}
+
+
+/** Creates a port and connects the plugin instance to it's data location.
+ *
+ * For audio ports, creates a jack port and connects plugin port to buffer.
+ *
+ * For control ports, sets controls array to default value and connects plugin
+ * port to that element.
+ */
+void
+create_port(struct JackHost* host,
+ uint32_t port_index)
+{
+ //struct Port* port = (Port*)malloc(sizeof(Port));
+ struct Port* const port = &host->ports[port_index];
+
+ port->type = UNKNOWN;
+ port->jack_port = NULL;
+ port->control = 0.0f;
+ port->midi_buffer = NULL;
+
+ slv2_instance_connect_port(host->instance, port_index, NULL);
+
+ char* type_str = slv2_port_get_data_type(host->plugin, port_index);
+ if (!strcmp(type_str, SLV2_DATA_TYPE_FLOAT))
+ port->type = FLOAT;
+ else if (!strcmp(type_str, SLV2_DATA_TYPE_MIDI))
+ port->type = MIDI;
+
+ /* Get the port symbol (label) for console printing */
+ char* symbol = slv2_port_get_symbol(host->plugin, port_index);
+
+ /* Get the 'class' (not data type) of the port (control input, audio output, etc) */
+ enum SLV2PortClass class = slv2_port_get_class(host->plugin, port_index);
+
+ if (port->type == FLOAT) {
+
+ /* Connect the port based on it's 'class' */
+ switch (class) {
+ case SLV2_CONTROL_RATE_INPUT:
+ port->direction = INPUT;
+ port->control = slv2_port_get_default_value(host->plugin, port_index);
+ slv2_instance_connect_port(host->instance, port_index, &port->control);
+ printf("Set %s to %f\n", symbol, host->ports[port_index].control);
+ break;
+ case SLV2_CONTROL_RATE_OUTPUT:
+ port->direction = OUTPUT;
+ slv2_instance_connect_port(host->instance, port_index, &port->control);
+ break;
+ case SLV2_AUDIO_RATE_INPUT:
+ printf("AI!\n");
+ port->direction = INPUT;
+ port->jack_port = jack_port_register(host->jack_client,
+ symbol, JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
+ break;
+ case SLV2_AUDIO_RATE_OUTPUT:
+ printf("AO!\n");
+ port->direction = OUTPUT;
+ port->jack_port = jack_port_register(host->jack_client,
+ symbol, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+ break;
+ default:
+ fprintf(stderr, "ERROR: Unknown port class\n");
+ }
+
+ } else if (port->type == MIDI) {
+
+ printf("MIDI! %s\n", symbol);
+ if (class == SLV2_CONTROL_RATE_INPUT) {
+ port->direction = INPUT;
+ port->jack_port = jack_port_register(host->jack_client,
+ symbol, JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);
+ port->midi_buffer = lv2midi_new(MIDI_BUFFER_SIZE);
+ slv2_instance_connect_port(host->instance, port_index, port->midi_buffer);
+ } else if (class == SLV2_CONTROL_RATE_OUTPUT) {
+ port->direction = OUTPUT;
+ port->jack_port = jack_port_register(host->jack_client,
+ symbol, JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
+ port->midi_buffer = lv2midi_new(MIDI_BUFFER_SIZE);
+ slv2_instance_connect_port(host->instance, port_index, port->midi_buffer);
+ } else {
+ fprintf(stderr, "ERROR: Audio rate MIDI port?? Ignoring.\n");
+ }
+
+ } else {
+
+ fprintf(stderr, "Unrecognized data type %s for port %s, ignored.\n",
+ type_str, symbol);
+ fprintf(stderr, " %s\n",
+ SLV2_DATA_TYPE_MIDI);
+
+ }
+
+ free(symbol);
+ free(type_str);
+}
+
+
+/** Jack process callback. */
+int
+jack_process_cb(jack_nframes_t nframes, void* data)
+{
+ struct JackHost* const host = (struct JackHost*)data;
+
+ /* Connect inputs */
+ for (uint32_t p=0; p < host->num_ports; ++p) {
+ if (!host->ports[p].jack_port)
+ continue;
+
+ if (host->ports[p].type == FLOAT) {
+ slv2_instance_connect_port(host->instance, p,
+ jack_port_get_buffer(host->ports[p].jack_port, nframes));
+ } else if (host->ports[p].type == MIDI) {
+
+ void* jack_buffer = jack_port_get_buffer(host->ports[p].jack_port, nframes);
+
+ LV2_MIDIState state;
+ lv2midi_reset_state(&state, host->ports[p].midi_buffer, nframes);
+ lv2midi_reset_buffer(state.midi);
+
+ if (host->ports[p].direction == INPUT) {
+ jack_midi_event_t ev;
+
+ const jack_nframes_t event_count
+ = jack_midi_get_event_count(jack_buffer, nframes);
+
+ for (jack_nframes_t e=0; e < event_count; ++e) {
+
+ jack_midi_event_get(&ev, jack_buffer, e, nframes);
+
+ state.midi = host->ports[p].midi_buffer;
+ lv2midi_put_event(&state, (double)ev.time, ev.size, ev.buffer);
+ }
+ }
+ }
+ }
+
+
+ /* Run plugin for this cycle */
+ slv2_instance_run(host->instance, nframes);
+
+
+ /* Deliver output */
+ for (uint32_t p=0; p < host->num_ports; ++p) {
+ if (host->ports[p].jack_port
+ && host->ports[p].type == MIDI
+ && host->ports[p].direction == OUTPUT) {
+
+ void* jack_buffer = jack_port_get_buffer(host->ports[p].jack_port, nframes);
+
+ jack_midi_clear_buffer(jack_buffer, nframes);
+
+ LV2_MIDIState state;
+ lv2midi_reset_state(&state, host->ports[p].midi_buffer, nframes);
+
+ double timestamp = 0.0f;
+ uint32_t size = 0;
+ unsigned char* data = NULL;
+
+ const uint32_t event_count = state.midi->event_count;
+
+ for (uint32_t i=0; i < event_count; ++i) {
+ lv2midi_get_event(&state, &timestamp, &size, &data);
+
+ jack_midi_event_write(jack_buffer,
+ (jack_nframes_t)timestamp, data, size, nframes);
+
+ lv2midi_increment(&state);
+ }
+
+ }
+ }
+
+ return 0;
+}
+
+
+void
+list_plugins(SLV2List list)
+{
+ for (size_t i=0; i < slv2_list_get_length(list); ++i) {
+ const SLV2Plugin* const p = slv2_list_get_plugin_by_index(list, i);
+ printf("%s\n", slv2_plugin_get_uri(p));
+ }
+}
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