# HG changeset patch
# User paulo@localhost
# Date 1242540226 25200
# Node ID 047192fef9402168efc780ffa4f75edd151f7745

copy metro.c from jack example-clients

diff -r 000000000000 -r 047192fef940 metro.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/metro.c	Sat May 16 23:03:46 2009 -0700
@@ -0,0 +1,270 @@
+/*
+    Copyright (C) 2002 Anthony Van Groningen
+    
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+// 20090516 PBA: started modifying metro.c for lsonify 
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <math.h>
+#include <getopt.h>
+#include <string.h>
+
+#include <jack/jack.h>
+#include <jack/transport.h>
+
+typedef jack_default_audio_sample_t sample_t;
+
+const double PI = 3.14;
+
+jack_client_t *client;
+jack_port_t *output_port;
+unsigned long sr;
+int freq = 880;
+int bpm;
+jack_nframes_t tone_length, wave_length;
+sample_t *wave;
+long offset = 0;
+int transport_aware = 0;
+jack_transport_state_t transport_state;
+
+void
+usage ()
+
+{
+	fprintf (stderr, "\n"
+"usage: jack_metro \n"
+"              [ --frequency OR -f frequency (in Hz) ]\n"
+"              [ --amplitude OR -A maximum amplitude (between 0 and 1) ]\n"
+"              [ --duration OR -D duration (in ms) ]\n"
+"              [ --attack OR -a attack (in percent of duration) ]\n"
+"              [ --decay OR -d decay (in percent of duration) ]\n"
+"              [ --name OR -n jack name for metronome client ]\n"
+"              [ --transport OR -t transport aware ]\n"
+"              --bpm OR -b beats per minute\n"
+);
+}
+
+void
+process_silence (jack_nframes_t nframes) 
+{
+	sample_t *buffer = (sample_t *) jack_port_get_buffer (output_port, nframes);
+	memset (buffer, 0, sizeof (jack_default_audio_sample_t) * nframes);
+}
+
+void
+process_audio (jack_nframes_t nframes) 
+{
+
+	sample_t *buffer = (sample_t *) jack_port_get_buffer (output_port, nframes);
+	jack_nframes_t frames_left = nframes;
+		
+	while (wave_length - offset < frames_left) {
+		memcpy (buffer + (nframes - frames_left), wave + offset, sizeof (sample_t) * (wave_length - offset));
+		frames_left -= wave_length - offset;
+		offset = 0;
+	}
+	if (frames_left > 0) {
+		memcpy (buffer + (nframes - frames_left), wave + offset, sizeof (sample_t) * frames_left);
+		offset += frames_left;
+	}
+}
+
+int
+process (jack_nframes_t nframes, void *arg)
+{
+	if (transport_aware) {
+		jack_position_t pos;
+
+		if (jack_transport_query (client, &pos)
+		    != JackTransportRolling) {
+
+			process_silence (nframes);
+			return 0;
+		}
+		offset = pos.frame % wave_length;
+	}
+	process_audio (nframes);
+	return 0;
+}
+
+int
+sample_rate_change () {
+	printf("Sample rate has changed! Exiting...\n");
+	exit(-1);
+}
+
+int
+main (int argc, char *argv[])
+{
+	
+	sample_t scale;
+	int i, attack_length, decay_length;
+	double *amp;
+	double max_amp = 0.5;
+	int option_index;
+	int opt;
+	int got_bpm = 0;
+	int attack_percent = 1, decay_percent = 10, dur_arg = 100;
+	char *client_name = 0;
+	char *bpm_string = "bpm";
+	int verbose = 0;
+	jack_status_t status;
+
+	const char *options = "f:A:D:a:d:b:n:thv";
+	struct option long_options[] =
+	{
+		{"frequency", 1, 0, 'f'},
+		{"amplitude", 1, 0, 'A'},
+		{"duration", 1, 0, 'D'},
+		{"attack", 1, 0, 'a'},
+		{"decay", 1, 0, 'd'},
+		{"bpm", 1, 0, 'b'},
+		{"name", 1, 0, 'n'},
+		{"transport", 0, 0, 't'},
+		{"help", 0, 0, 'h'},
+		{"verbose", 0, 0, 'v'},
+		{0, 0, 0, 0}
+	};
+	
+	while ((opt = getopt_long (argc, argv, options, long_options, &option_index)) != EOF) {
+		switch (opt) {
+		case 'f':
+			if ((freq = atoi (optarg)) <= 0) {
+				fprintf (stderr, "invalid frequency\n");
+				return -1;
+			}
+			break;
+		case 'A':
+			if (((max_amp = atof (optarg)) <= 0)|| (max_amp > 1)) {
+				fprintf (stderr, "invalid amplitude\n");
+				return -1;
+			}
+			break;
+		case 'D':
+			dur_arg = atoi (optarg);
+			fprintf (stderr, "durarg = %u\n", dur_arg);
+			break;
+		case 'a':
+			if (((attack_percent = atoi (optarg)) < 0) || (attack_percent > 100)) {
+				fprintf (stderr, "invalid attack percent\n");
+				return -1;
+			}
+			break;
+		case 'd':
+			if (((decay_percent = atoi (optarg)) < 0) || (decay_percent > 100)) {
+				fprintf (stderr, "invalid decay percent\n");
+				return -1;
+			}
+			break;
+		case 'b':
+			got_bpm = 1;
+			if ((bpm = atoi (optarg)) < 0) {
+				fprintf (stderr, "invalid bpm\n");
+				return -1;
+			}
+			bpm_string = (char *) malloc ((strlen (optarg) + 4) * sizeof (char));
+			strcpy (bpm_string, optarg);
+			strcat (bpm_string, "_bpm");
+			break;
+		case 'n':
+			client_name = (char *) malloc (strlen (optarg) * sizeof (char));
+			strcpy (client_name, optarg);
+			break;
+		case 'v':
+			verbose = 1;
+			break;
+		case 't':
+			transport_aware = 1;
+			break;
+		default:
+			fprintf (stderr, "unknown option %c\n", opt); 
+		case 'h':
+			usage ();
+			return -1;
+		}
+	}
+	if (!got_bpm) {
+		fprintf (stderr, "bpm not specified\n");
+		usage ();
+		return -1;
+	}
+
+	/* Initial Jack setup, get sample rate */
+	if (!client_name) {
+		client_name = (char *) malloc (9 * sizeof (char));
+		strcpy (client_name, "metro");
+	}
+	if ((client = jack_client_open (client_name, JackNoStartServer, &status)) == 0) {
+		fprintf (stderr, "jack server not running?\n");
+		return 1;
+	}
+	jack_set_process_callback (client, process, 0);
+	output_port = jack_port_register (client, bpm_string, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+
+	sr = jack_get_sample_rate (client);
+
+	/* setup wave table parameters */
+	wave_length = 60 * sr / bpm;
+	tone_length = sr * dur_arg / 1000;
+	attack_length = tone_length * attack_percent / 100;
+	decay_length = tone_length * decay_percent / 100;
+	scale = 2 * PI * freq / sr;
+
+	if (tone_length >= wave_length) {
+		fprintf (stderr, "invalid duration (tone length = %" PRIu32
+			 ", wave length = %" PRIu32 "\n", tone_length,
+			 wave_length);
+		return -1;
+	}
+	if (attack_length + decay_length > (int)tone_length) {
+		fprintf (stderr, "invalid attack/decay\n");
+		return -1;
+	}
+
+	/* Build the wave table */
+	wave = (sample_t *) malloc (wave_length * sizeof(sample_t));
+	amp = (double *) malloc (tone_length * sizeof(double));
+
+	for (i = 0; i < attack_length; i++) {
+		amp[i] = max_amp * i / ((double) attack_length);
+	}
+	for (i = attack_length; i < (int)tone_length - decay_length; i++) {
+		amp[i] = max_amp;
+	}
+	for (i = (int)tone_length - decay_length; i < (int)tone_length; i++) {
+		amp[i] = - max_amp * (i - (double) tone_length) / ((double) decay_length);
+	}
+	for (i = 0; i < (int)tone_length; i++) {
+		wave[i] = amp[i] * sin (scale * i);
+	}
+	for (i = tone_length; i < (int)wave_length; i++) {
+		wave[i] = 0;
+	}
+
+	if (jack_activate (client)) {
+		fprintf (stderr, "cannot activate client");
+		return 1;
+	}
+
+	while (1) {
+		sleep(1);
+	};
+	
+}