Reorganized tree in preparation for beta release.

Split simple (example) jack host and more useful one (with midi).
Working Jack/LV2 midi in lv2_jack_host.
Added lv2_list.


git-svn-id: http://svn.drobilla.net/lad/slv2@279 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 220 insertions, 0 deletions

diff --git a/hosts/lv2_simple_jack_host.c b/hosts/lv2_simple_jack_host.c
new file mode 100644
index 0000000..f0a266d
--- /dev/null
+++ b/hosts/lv2_simple_jack_host.c
@@ -0,0 +1,220 @@
+/* SLV2 Simple Jack Host Example
+ * Copyright (C) 2007 Dave Robillard <drobilla.net>
+ *  
+ * 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>
+
+
+/** 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: */
+	jack_port_t**  jack_ports;  /**< For audio ports, otherwise NULL */
+	float*         controls;    /**< For control ports, otherwise 0.0f */
+};
+
+
+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.jack_ports  = NULL;
+	host.controls    = 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.jack_ports = calloc((size_t)host.num_ports, sizeof(jack_port_t*));
+	host.controls   = calloc((size_t)host.num_ports, sizeof(float*));
+	
+	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.jack_ports[i] != NULL) {
+			jack_port_unregister(host.jack_client, host.jack_ports[i]);
+			host.jack_ports[i] = NULL;
+		}
+	}
+	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)
+{
+	/* Make sure this is a float port */
+	char* type = slv2_port_get_data_type(host->plugin, port_index);
+	if (strcmp(type, SLV2_DATA_TYPE_FLOAT))
+		die("Unrecognized data type, aborting.");
+	free(type);
+
+	/* Get the port symbol (label) for console printing */
+	char* symbol = slv2_port_get_symbol(host->plugin, port_index);
+	
+	/* Initialize the port array elements */
+	host->jack_ports[port_index] = NULL;
+	host->controls[port_index]   = 0.0f;
+	
+	/* Get the 'class' of the port (control input, audio output, etc) */
+	enum SLV2PortClass class = slv2_port_get_class(host->plugin, port_index);
+	
+	/* Connect the port based on it's 'class' */
+	switch (class) {
+	case SLV2_CONTROL_RATE_INPUT:
+		host->controls[port_index] = slv2_port_get_default_value(host->plugin, port_index);
+		slv2_instance_connect_port(host->instance, port_index, &host->controls[port_index]);
+		printf("Set %s to %f\n", symbol, host->controls[port_index]);
+		break;
+	case SLV2_CONTROL_RATE_OUTPUT:
+		slv2_instance_connect_port(host->instance, port_index, &host->controls[port_index]);
+		break;
+	case SLV2_AUDIO_RATE_INPUT:
+		host->jack_ports[port_index] = jack_port_register(host->jack_client,
+			symbol, JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
+		break;
+	case SLV2_AUDIO_RATE_OUTPUT:
+		host->jack_ports[port_index] = jack_port_register(host->jack_client,
+			symbol, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+		break;
+	default:
+		die("ERROR: Unknown port type, aborting messily!");
+	}
+
+	free(symbol);
+}
+
+
+/** Jack process callback. */
+int
+jack_process_cb(jack_nframes_t nframes, void* data)
+{
+	struct JackHost* host = (struct JackHost*)data;
+
+	/* Connect plugin ports directly to JACK buffers */
+	for (uint32_t i=0; i < host->num_ports; ++i)
+		if (host->jack_ports[i] != NULL)
+			slv2_instance_connect_port(host->instance, i,
+				jack_port_get_buffer(host->jack_ports[i], nframes));
+	
+	/* Run plugin for this cycle */
+	slv2_instance_run(host->instance, nframes);
+
+	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));
+	}
+}