2
Copyright (C) 2002 Anthony Van Groningen
4
This program is free software; you can redistribute it and/or modify
5
it under the terms of the GNU General Public License as published by
6
the Free Software Foundation; either version 2 of the License, or
7
(at your option) any later version.
9
This program is distributed in the hope that it will be useful,
10
but WITHOUT ANY WARRANTY; without even the implied warranty of
11
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
GNU General Public License for more details.
14
You should have received a copy of the GNU General Public License
15
along with this program; if not, write to the Free Software
16
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
#include "external_metro.h"
22
typedef jack_default_audio_sample_t sample_t;
24
const double PI = 3.14;
26
static void JackSleep(int sec)
35
int ExternalMetro::process_audio (jack_nframes_t nframes, void* arg)
37
ExternalMetro* metro = (ExternalMetro*)arg;
38
sample_t *buffer = (sample_t *) jack_port_get_buffer (metro->output_port, nframes);
39
jack_nframes_t frames_left = nframes;
41
while (metro->wave_length - metro->offset < frames_left) {
42
memcpy (buffer + (nframes - frames_left), metro->wave + metro->offset, sizeof (sample_t) * (metro->wave_length - metro->offset));
43
frames_left -= metro->wave_length - metro->offset;
46
if (frames_left > 0) {
47
memcpy (buffer + (nframes - frames_left), metro->wave + metro->offset, sizeof (sample_t) * frames_left);
48
metro->offset += frames_left;
54
void ExternalMetro::shutdown (void* arg)
56
printf("shutdown called..\n");
59
ExternalMetro::ExternalMetro(int freq, double max_amp, int dur_arg, int bpm, const char* client_name)
62
int i, attack_length, decay_length;
64
int attack_percent = 1, decay_percent = 10;
65
const char *bpm_string = "bpm";
66
jack_options_t options = JackNullOption;
70
/* Initial Jack setup, get sample rate */
71
if ((client = jack_client_open (client_name, options, &status)) == 0) {
72
fprintf (stderr, "jack server not running?\n");
76
jack_set_process_callback (client, process_audio, this);
77
jack_on_shutdown (client, shutdown, this);
78
output_port = jack_port_register (client, bpm_string, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
79
input_port = jack_port_register (client, "metro_in", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
81
sr = jack_get_sample_rate (client);
83
/* setup wave table parameters */
84
wave_length = 60 * sr / bpm;
85
tone_length = sr * dur_arg / 1000;
86
attack_length = tone_length * attack_percent / 100;
87
decay_length = tone_length * decay_percent / 100;
88
scale = 2 * PI * freq / sr;
90
if (tone_length >= wave_length) {
92
fprintf (stderr, "invalid duration (tone length = %" PRIu32
93
", wave length = %" PRIu32 "\n", tone_length,
98
if (attack_length + decay_length > (int)tone_length) {
99
fprintf (stderr, "invalid attack/decay\n");
103
/* Build the wave table */
104
wave = (sample_t *) malloc (wave_length * sizeof(sample_t));
105
amp = (double *) malloc (tone_length * sizeof(double));
107
for (i = 0; i < attack_length; i++) {
108
amp[i] = max_amp * i / ((double) attack_length);
110
for (i = attack_length; i < (int) tone_length - decay_length; i++) {
113
for (i = (int)tone_length - decay_length; i < (int)tone_length; i++) {
114
amp[i] = - max_amp * (i - (double) tone_length) / ((double) decay_length);
116
for (i = 0; i < (int) tone_length; i++) {
117
wave[i] = amp[i] * sin (scale * i);
119
for (i = tone_length; i < (int) wave_length; i++) {
123
if (jack_activate (client)) {
124
fprintf (stderr, "cannot activate client");
128
ExternalMetro::~ExternalMetro()
130
jack_deactivate(client);
131
jack_port_unregister(client, input_port);
132
jack_port_unregister(client, output_port);
133
jack_client_close(client);
136
int main (int argc, char *argv[])
138
ExternalMetro* client1 = NULL;
139
ExternalMetro* client2 = NULL;
140
ExternalMetro* client3 = NULL;
141
ExternalMetro* client4 = NULL;
142
ExternalMetro* client5 = NULL;
144
printf("Testing multiple Jack clients in one process: open 5 metro clients...\n");
145
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
146
client2 = new ExternalMetro(600, 0.4, 20, 150, "t2");
147
client3 = new ExternalMetro(1000, 0.4, 20, 110, "t3");
148
client4 = new ExternalMetro(400, 0.4, 20, 200, "t4");
149
client5 = new ExternalMetro(1500, 0.4, 20, 150, "t5");
151
printf("Type 'c' to close all clients and go to next test...\n");
152
while ((getchar() != 'c')) {
162
printf("Testing quitting the server while a client is running...\n");
163
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
165
printf("Now quit the server, shutdown callback should be called...\n");
166
printf("Type 'c' to move on...\n");
167
while ((getchar() != 'c')) {
171
printf("Closing client...\n");
174
printf("Now start the server again...\n");
175
printf("Type 'c' to move on...\n");
176
while ((getchar() != 'c')) {
180
printf("Opening a new client....\n");
181
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
183
printf("Now quit the server, shutdown callback should be called...\n");
184
printf("Type 'c' to move on...\n");
185
while ((getchar() != 'c')) {
189
printf("Simulating client not correctly closed...\n");
191
printf("Opening a new client....\n");
193
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
195
printf("Cannot open a new client since old one was not closed correctly... OK\n");
198
printf("Type 'q' to quit...\n");
199
while ((getchar() != 'q')) {