Added basic JACK funcitonality.

Makefile

@@ -19,8 +19,8 @@ DEBUG=0
 INCFLAGS=`pkg-config jack --cflags`
 LDFLAGS=`pkg-config jack --libs` -lreadline
 CFLAGS=$(INCFLAGS) -std=c99 -Wall -Wextra -Wfatal-errors -Werror
-HDRS=src/args.h
-OBJS=src/main.o
+HDRS=src/args.h src/processing.h
+OBJS=src/main.o src/processing.o
 
 ifeq ($(DEBUG),1)
 	CFLAGS+=-g -O0 -DDEBUG

src/main.c

@@ -17,11 +17,19 @@
  */
 
 #include "args.h"
+#include "processing.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <readline/readline.h>
 #include <jack/jack.h>
 
+jack_port_t *in_port;
+jack_port_t *out_port;
+jack_client_t *client;
+
+void jack_shutdown(void *arg);
+
 int main(int argc, char *argv[]) {
 	struct arguments arguments;
 	arguments.verbose = 0;
@@ -29,5 +37,62 @@ int main(int argc, char *argv[]) {
 	arguments.playlist_file = NULL;
 
 	argp_parse(&argp, argc, argv, 0, 0, &arguments);
+
+	/*const char **ports;*/
+	const char *client_name = "saus";
+	const char *server_name = NULL;
+	jack_options_t options = JackNullOption;
+	jack_status_t status;
+
+	client = jack_client_open(client_name, options, &status, server_name);
+	if(!client)
+	{
+		fprintf(stderr, "jack_client_open() failed, "
+				"status = 0x%2.0x\n", status);
+		if(status & JackServerFailed)
+		{
+			fprintf(stderr, "Unable to connect to JACK server\n");
+		}
+		exit(1);
+	}
+	if(status & JackServerStarted)
+	{
+		fprintf(stderr, "JACK server started\n");
+	}
+	if(status & JackNameNotUnique)
+	{
+		client_name = jack_get_client_name(client);
+		fprintf(stderr, "unique name `%s' assigned\n", client_name);
+	}
+
+	jack_set_process_callback(client, process, 0);
+	jack_on_shutdown(client, jack_shutdown, "Shut down by JACK server");
+
+	in_port = jack_port_register(client, "input",
+			JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
+	out_port = jack_port_register(client, "output",
+			JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+
+	if(!in_port || !out_port)
+	{
+		fprintf(stderr, "No more JACK ports available\n");
+		exit(1);
+	}
+
+	if(jack_activate(client))
+	{
+		fprintf(stderr, "Cannot activate JACK client\n");
+		exit(1);
+	}
+
+	// TODO: add main loop here
+
+	jack_client_close(client);
+
 	return 0;
 }
+
+void jack_shutdown(void *arg) {
+	fprintf(stderr, "%s", (char*)arg);
+	exit(1);
+}

src/processing.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ * Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "processing.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int process(jack_nframes_t nframes, void *arg) {
+	if(!arg)
+	{
+		fprintf(stderr, "No script supplied");
+		exit(1);
+	}
+	jack_default_audio_sample_t *in, *out;
+
+	memcpy(out, in,
+			sizeof(jack_default_audio_sample_t) *nframes);
+
+	return 0;
+}

src/processing.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2019 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ * Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <jack/jack.h>
+
+int process(jack_nframes_t nframes, void *arg);