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/*
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.
*/
#include "external_metro.h"
#include <stdio.h>
typedef jack_default_audio_sample_t sample_t;
const double PI = 3.14;
static void JackSleep(int sec)
{
#ifdef WIN32
Sleep(sec * 1000);
#else
sleep(sec);
#endif
}
int ExternalMetro::process_audio (jack_nframes_t nframes, void* arg)
{
ExternalMetro* metro = (ExternalMetro*)arg;
sample_t *buffer = (sample_t *) jack_port_get_buffer (metro->output_port, nframes);
jack_nframes_t frames_left = nframes;
while (metro->wave_length - metro->offset < frames_left) {
memcpy (buffer + (nframes - frames_left), metro->wave + metro->offset, sizeof (sample_t) * (metro->wave_length - metro->offset));
frames_left -= metro->wave_length - metro->offset;
metro->offset = 0;
}
if (frames_left > 0) {
memcpy (buffer + (nframes - frames_left), metro->wave + metro->offset, sizeof (sample_t) * frames_left);
metro->offset += frames_left;
}
return 0;
}
void ExternalMetro::shutdown (void* arg)
{
printf("shutdown called..\n");
}
ExternalMetro::ExternalMetro(int freq, double max_amp, int dur_arg, int bpm, const char* client_name)
{
sample_t scale;
int i, attack_length, decay_length;
int attack_percent = 1, decay_percent = 10;
const char *bpm_string = "bpm";
jack_options_t options = JackNullOption;
jack_status_t status;
offset = 0;
/* Initial Jack setup, get sample rate */
if ((client = jack_client_open (client_name, options, &status)) == 0) {
fprintf (stderr, "jack server not running?\n");
throw -1;
}
jack_set_process_callback (client, process_audio, this);
jack_on_shutdown (client, shutdown, this);
output_port = jack_port_register (client, bpm_string, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
input_port = jack_port_register (client, "metro_in", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 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 ;
}
if (attack_length + decay_length > (int)tone_length) {
fprintf (stderr, "invalid attack/decay\n");
return ;
}
/* 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");
}
}
ExternalMetro::~ExternalMetro()
{
jack_deactivate(client);
jack_port_unregister(client, input_port);
jack_port_unregister(client, output_port);
jack_client_close(client);
free(amp);
free(wave);
}
int main (int argc, char *argv[])
{
ExternalMetro* client1 = NULL;
ExternalMetro* client2 = NULL;
ExternalMetro* client3 = NULL;
ExternalMetro* client4 = NULL;
ExternalMetro* client5 = NULL;
printf("Testing multiple Jack clients in one process: open 5 metro clients...\n");
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
client2 = new ExternalMetro(600, 0.4, 20, 150, "t2");
client3 = new ExternalMetro(1000, 0.4, 20, 110, "t3");
client4 = new ExternalMetro(400, 0.4, 20, 200, "t4");
client5 = new ExternalMetro(1500, 0.4, 20, 150, "t5");
printf("Type 'c' to close all clients and go to next test...\n");
while ((getchar() != 'c')) {
JackSleep(1);
};
delete client1;
delete client2;
delete client3;
delete client4;
delete client5;
printf("Testing quitting the server while a client is running...\n");
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
printf("Now quit the server, shutdown callback should be called...\n");
printf("Type 'c' to move on...\n");
while ((getchar() != 'c')) {
JackSleep(1);
};
printf("Closing client...\n");
delete client1;
printf("Now start the server again...\n");
printf("Type 'c' to move on...\n");
while ((getchar() != 'c')) {
JackSleep(1);
};
printf("Opening a new client....\n");
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
printf("Now quit the server, shutdown callback should be called...\n");
printf("Type 'c' to move on...\n");
while ((getchar() != 'c')) {
JackSleep(1);
};
printf("Simulating client not correctly closed...\n");
printf("Opening a new client....\n");
try {
client1 = new ExternalMetro(1200, 0.4, 20, 80, "t1");
} catch (int num) {
printf("Cannot open a new client since old one was not closed correctly... OK\n");
}
printf("Type 'q' to quit...\n");
while ((getchar() != 'q')) {
JackSleep(1);
};
delete client1;
return 0;
}
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