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view metro.c @ 0:047192fef940
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| author | paulo@localhost |
|---|---|
| date | Sat, 16 May 2009 23:03:46 -0700 |
| parents | |
| children | 46d4c88917a2 |
line source
1 /*
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.
17 */
19 // 20090516 PBA: started modifying metro.c for lsonify
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <errno.h>
24 #include <unistd.h>
25 #include <math.h>
26 #include <getopt.h>
27 #include <string.h>
29 #include <jack/jack.h>
30 #include <jack/transport.h>
32 typedef jack_default_audio_sample_t sample_t;
34 const double PI = 3.14;
36 jack_client_t *client;
37 jack_port_t *output_port;
38 unsigned long sr;
39 int freq = 880;
40 int bpm;
41 jack_nframes_t tone_length, wave_length;
42 sample_t *wave;
43 long offset = 0;
44 int transport_aware = 0;
45 jack_transport_state_t transport_state;
47 void
48 usage ()
50 {
51 fprintf (stderr, "\n"
52 "usage: jack_metro \n"
53 " [ --frequency OR -f frequency (in Hz) ]\n"
54 " [ --amplitude OR -A maximum amplitude (between 0 and 1) ]\n"
55 " [ --duration OR -D duration (in ms) ]\n"
56 " [ --attack OR -a attack (in percent of duration) ]\n"
57 " [ --decay OR -d decay (in percent of duration) ]\n"
58 " [ --name OR -n jack name for metronome client ]\n"
59 " [ --transport OR -t transport aware ]\n"
60 " --bpm OR -b beats per minute\n"
61 );
62 }
64 void
65 process_silence (jack_nframes_t nframes)
66 {
67 sample_t *buffer = (sample_t *) jack_port_get_buffer (output_port, nframes);
68 memset (buffer, 0, sizeof (jack_default_audio_sample_t) * nframes);
69 }
71 void
72 process_audio (jack_nframes_t nframes)
73 {
75 sample_t *buffer = (sample_t *) jack_port_get_buffer (output_port, nframes);
76 jack_nframes_t frames_left = nframes;
78 while (wave_length - offset < frames_left) {
79 memcpy (buffer + (nframes - frames_left), wave + offset, sizeof (sample_t) * (wave_length - offset));
80 frames_left -= wave_length - offset;
81 offset = 0;
82 }
83 if (frames_left > 0) {
84 memcpy (buffer + (nframes - frames_left), wave + offset, sizeof (sample_t) * frames_left);
85 offset += frames_left;
86 }
87 }
89 int
90 process (jack_nframes_t nframes, void *arg)
91 {
92 if (transport_aware) {
93 jack_position_t pos;
95 if (jack_transport_query (client, &pos)
96 != JackTransportRolling) {
98 process_silence (nframes);
99 return 0;
100 }
101 offset = pos.frame % wave_length;
102 }
103 process_audio (nframes);
104 return 0;
105 }
107 int
108 sample_rate_change () {
109 printf("Sample rate has changed! Exiting...\n");
110 exit(-1);
111 }
113 int
114 main (int argc, char *argv[])
115 {
117 sample_t scale;
118 int i, attack_length, decay_length;
119 double *amp;
120 double max_amp = 0.5;
121 int option_index;
122 int opt;
123 int got_bpm = 0;
124 int attack_percent = 1, decay_percent = 10, dur_arg = 100;
125 char *client_name = 0;
126 char *bpm_string = "bpm";
127 int verbose = 0;
128 jack_status_t status;
130 const char *options = "f:A:D:a:d:b:n:thv";
131 struct option long_options[] =
132 {
133 {"frequency", 1, 0, 'f'},
134 {"amplitude", 1, 0, 'A'},
135 {"duration", 1, 0, 'D'},
136 {"attack", 1, 0, 'a'},
137 {"decay", 1, 0, 'd'},
138 {"bpm", 1, 0, 'b'},
139 {"name", 1, 0, 'n'},
140 {"transport", 0, 0, 't'},
141 {"help", 0, 0, 'h'},
142 {"verbose", 0, 0, 'v'},
143 {0, 0, 0, 0}
144 };
146 while ((opt = getopt_long (argc, argv, options, long_options, &option_index)) != EOF) {
147 switch (opt) {
148 case 'f':
149 if ((freq = atoi (optarg)) <= 0) {
150 fprintf (stderr, "invalid frequency\n");
151 return -1;
152 }
153 break;
154 case 'A':
155 if (((max_amp = atof (optarg)) <= 0)|| (max_amp > 1)) {
156 fprintf (stderr, "invalid amplitude\n");
157 return -1;
158 }
159 break;
160 case 'D':
161 dur_arg = atoi (optarg);
162 fprintf (stderr, "durarg = %u\n", dur_arg);
163 break;
164 case 'a':
165 if (((attack_percent = atoi (optarg)) < 0) || (attack_percent > 100)) {
166 fprintf (stderr, "invalid attack percent\n");
167 return -1;
168 }
169 break;
170 case 'd':
171 if (((decay_percent = atoi (optarg)) < 0) || (decay_percent > 100)) {
172 fprintf (stderr, "invalid decay percent\n");
173 return -1;
174 }
175 break;
176 case 'b':
177 got_bpm = 1;
178 if ((bpm = atoi (optarg)) < 0) {
179 fprintf (stderr, "invalid bpm\n");
180 return -1;
181 }
182 bpm_string = (char *) malloc ((strlen (optarg) + 4) * sizeof (char));
183 strcpy (bpm_string, optarg);
184 strcat (bpm_string, "_bpm");
185 break;
186 case 'n':
187 client_name = (char *) malloc (strlen (optarg) * sizeof (char));
188 strcpy (client_name, optarg);
189 break;
190 case 'v':
191 verbose = 1;
192 break;
193 case 't':
194 transport_aware = 1;
195 break;
196 default:
197 fprintf (stderr, "unknown option %c\n", opt);
198 case 'h':
199 usage ();
200 return -1;
201 }
202 }
203 if (!got_bpm) {
204 fprintf (stderr, "bpm not specified\n");
205 usage ();
206 return -1;
207 }
209 /* Initial Jack setup, get sample rate */
210 if (!client_name) {
211 client_name = (char *) malloc (9 * sizeof (char));
212 strcpy (client_name, "metro");
213 }
214 if ((client = jack_client_open (client_name, JackNoStartServer, &status)) == 0) {
215 fprintf (stderr, "jack server not running?\n");
216 return 1;
217 }
218 jack_set_process_callback (client, process, 0);
219 output_port = jack_port_register (client, bpm_string, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
221 sr = jack_get_sample_rate (client);
223 /* setup wave table parameters */
224 wave_length = 60 * sr / bpm;
225 tone_length = sr * dur_arg / 1000;
226 attack_length = tone_length * attack_percent / 100;
227 decay_length = tone_length * decay_percent / 100;
228 scale = 2 * PI * freq / sr;
230 if (tone_length >= wave_length) {
231 fprintf (stderr, "invalid duration (tone length = %" PRIu32
232 ", wave length = %" PRIu32 "\n", tone_length,
233 wave_length);
234 return -1;
235 }
236 if (attack_length + decay_length > (int)tone_length) {
237 fprintf (stderr, "invalid attack/decay\n");
238 return -1;
239 }
241 /* Build the wave table */
242 wave = (sample_t *) malloc (wave_length * sizeof(sample_t));
243 amp = (double *) malloc (tone_length * sizeof(double));
245 for (i = 0; i < attack_length; i++) {
246 amp[i] = max_amp * i / ((double) attack_length);
247 }
248 for (i = attack_length; i < (int)tone_length - decay_length; i++) {
249 amp[i] = max_amp;
250 }
251 for (i = (int)tone_length - decay_length; i < (int)tone_length; i++) {
252 amp[i] = - max_amp * (i - (double) tone_length) / ((double) decay_length);
253 }
254 for (i = 0; i < (int)tone_length; i++) {
255 wave[i] = amp[i] * sin (scale * i);
256 }
257 for (i = tone_length; i < (int)wave_length; i++) {
258 wave[i] = 0;
259 }
261 if (jack_activate (client)) {
262 fprintf (stderr, "cannot activate client");
263 return 1;
264 }
266 while (1) {
267 sleep(1);
268 };
270 }