jack1/example-clients/simple_client.c

/** @file simple_client.c
 *
 * @brief This simple client demonstrates the basic features of JACK
 * as they would be used by many applications.
 */

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#include <jack/jack.h>

jack_port_t *input_port;
jack_port_t *output_port;
jack_client_t *client;

/* a simple state machine for this client */
volatile enum {
	Init,
	Run,
	Exit
} client_state = Init;

/**
 * The process callback for this JACK application is called in a
 * special realtime thread once for each audio cycle.
 *
 * This client follows a simple rule: when the JACK transport is
 * running, copy the input port to the output.  When it stops, exit.
 */
int
process (jack_nframes_t nframes, void *arg)
{
	jack_default_audio_sample_t *in, *out;
	jack_transport_state_t ts = jack_transport_query(client, NULL);

	if (ts == JackTransportRolling) {

		if (client_state == Init)
			client_state = Run;

		in = jack_port_get_buffer (input_port, nframes);
		out = jack_port_get_buffer (output_port, nframes);
		memcpy (out, in,
			sizeof (jack_default_audio_sample_t) * nframes);

	} else if (ts == JackTransportStopped) {

		if (client_state == Run)
			client_state = Exit;
	}

	return 0;      
}

/**
 * JACK calls this shutdown_callback if the server ever shuts down or
 * decides to disconnect the client.
 */
void
jack_shutdown (void *arg)
{
	exit (1);
}

int
main (int argc, char *argv[])
{
	const char **ports;
	const char *client_name;
	jack_status_t status;

	if (argc >= 2) {		/* session name specified? */
		client_name = argv[1];
	} else {			/* use basename of argv[0] */
		client_name = strrchr(argv[0], '/');
		if (client_name == 0) {
			client_name = argv[0];
		} else {
			client_name++;
		}
	}

	/* open a client connection to the JACK server */

	client = jack_client_open (client_name, 0, &status, NULL, NULL);
	if (client == NULL) {
		fprintf (stderr, "jack_client_open() failed, status = %d\n",
			 status);
		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);
	}

	/* tell the JACK server to call `process()' whenever
	   there is work to be done.
	*/

	jack_set_process_callback (client, process, 0);

	/* tell the JACK server to call `jack_shutdown()' if
	   it ever shuts down, either entirely, or if it
	   just decides to stop calling us.
	*/

	jack_on_shutdown (client, jack_shutdown, 0);

	/* display the current sample rate. 
	 */

	printf ("engine sample rate: %" PRIu32 "\n",
		jack_get_sample_rate (client));

	/* create two ports */

	input_port = jack_port_register (client, "input",
					 JACK_DEFAULT_AUDIO_TYPE,
					 JackPortIsInput, 0);
	output_port = jack_port_register (client, "output",
					  JACK_DEFAULT_AUDIO_TYPE,
					  JackPortIsOutput, 0);

	/* Tell the JACK server that we are ready to roll.  Our
	 * process() callback will start running now. */

	if (jack_activate (client)) {
		fprintf (stderr, "cannot activate client");
		exit (1);
	}

	/* connect the ports. Note: you can't do this before the
	   client is activated, because we can't allow connections to
	   be made to clients that aren't running.
	*/

	ports = jack_get_ports (client, NULL, NULL,
				JackPortIsPhysical|JackPortIsOutput);
	if (ports == NULL) {
		fprintf(stderr, "no physical capture ports\n");
		exit (1);
	}

	if (jack_connect (client, ports[0], jack_port_name (input_port))) {
		fprintf (stderr, "cannot connect input ports\n");
	}

	free (ports);
	
	ports = jack_get_ports (client, NULL, NULL,
				JackPortIsPhysical|JackPortIsInput);
	if (ports == NULL) {
		fprintf(stderr, "no physical playback ports\n");
		exit (1);
	}

	if (jack_connect (client, jack_port_name (output_port), ports[0])) {
		fprintf (stderr, "cannot connect output ports\n");
	}

	free (ports);

	/* keep running until the transport stops */

	while (client_state != Exit) {
		sleep (1);
	}

	jack_client_close (client);
	exit (0);
}