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annotate metro.c @ 0:047192fef940

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copy metro.c from jack example-clients
author paulo@localhost
date Sat, 16 May 2009 23:03:46 -0700
parents
children 46d4c88917a2
rev   line source
paulo@0 1 /*
paulo@0 2 Copyright (C) 2002 Anthony Van Groningen
paulo@0 3
paulo@0 4 This program is free software; you can redistribute it and/or modify
paulo@0 5 it under the terms of the GNU General Public License as published by
paulo@0 6 the Free Software Foundation; either version 2 of the License, or
paulo@0 7 (at your option) any later version.
paulo@0 8
paulo@0 9 This program is distributed in the hope that it will be useful,
paulo@0 10 but WITHOUT ANY WARRANTY; without even the implied warranty of
paulo@0 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
paulo@0 12 GNU General Public License for more details.
paulo@0 13
paulo@0 14 You should have received a copy of the GNU General Public License
paulo@0 15 along with this program; if not, write to the Free Software
paulo@0 16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
paulo@0 17 */
paulo@0 18
paulo@0 19 // 20090516 PBA: started modifying metro.c for lsonify
paulo@0 20
paulo@0 21 #include <stdlib.h>
paulo@0 22 #include <stdio.h>
paulo@0 23 #include <errno.h>
paulo@0 24 #include <unistd.h>
paulo@0 25 #include <math.h>
paulo@0 26 #include <getopt.h>
paulo@0 27 #include <string.h>
paulo@0 28
paulo@0 29 #include <jack/jack.h>
paulo@0 30 #include <jack/transport.h>
paulo@0 31
paulo@0 32 typedef jack_default_audio_sample_t sample_t;
paulo@0 33
paulo@0 34 const double PI = 3.14;
paulo@0 35
paulo@0 36 jack_client_t *client;
paulo@0 37 jack_port_t *output_port;
paulo@0 38 unsigned long sr;
paulo@0 39 int freq = 880;
paulo@0 40 int bpm;
paulo@0 41 jack_nframes_t tone_length, wave_length;
paulo@0 42 sample_t *wave;
paulo@0 43 long offset = 0;
paulo@0 44 int transport_aware = 0;
paulo@0 45 jack_transport_state_t transport_state;
paulo@0 46
paulo@0 47 void
paulo@0 48 usage ()
paulo@0 49
paulo@0 50 {
paulo@0 51 fprintf (stderr, "\n"
paulo@0 52 "usage: jack_metro \n"
paulo@0 53 " [ --frequency OR -f frequency (in Hz) ]\n"
paulo@0 54 " [ --amplitude OR -A maximum amplitude (between 0 and 1) ]\n"
paulo@0 55 " [ --duration OR -D duration (in ms) ]\n"
paulo@0 56 " [ --attack OR -a attack (in percent of duration) ]\n"
paulo@0 57 " [ --decay OR -d decay (in percent of duration) ]\n"
paulo@0 58 " [ --name OR -n jack name for metronome client ]\n"
paulo@0 59 " [ --transport OR -t transport aware ]\n"
paulo@0 60 " --bpm OR -b beats per minute\n"
paulo@0 61 );
paulo@0 62 }
paulo@0 63
paulo@0 64 void
paulo@0 65 process_silence (jack_nframes_t nframes)
paulo@0 66 {
paulo@0 67 sample_t *buffer = (sample_t *) jack_port_get_buffer (output_port, nframes);
paulo@0 68 memset (buffer, 0, sizeof (jack_default_audio_sample_t) * nframes);
paulo@0 69 }
paulo@0 70
paulo@0 71 void
paulo@0 72 process_audio (jack_nframes_t nframes)
paulo@0 73 {
paulo@0 74
paulo@0 75 sample_t *buffer = (sample_t *) jack_port_get_buffer (output_port, nframes);
paulo@0 76 jack_nframes_t frames_left = nframes;
paulo@0 77
paulo@0 78 while (wave_length - offset < frames_left) {
paulo@0 79 memcpy (buffer + (nframes - frames_left), wave + offset, sizeof (sample_t) * (wave_length - offset));
paulo@0 80 frames_left -= wave_length - offset;
paulo@0 81 offset = 0;
paulo@0 82 }
paulo@0 83 if (frames_left > 0) {
paulo@0 84 memcpy (buffer + (nframes - frames_left), wave + offset, sizeof (sample_t) * frames_left);
paulo@0 85 offset += frames_left;
paulo@0 86 }
paulo@0 87 }
paulo@0 88
paulo@0 89 int
paulo@0 90 process (jack_nframes_t nframes, void *arg)
paulo@0 91 {
paulo@0 92 if (transport_aware) {
paulo@0 93 jack_position_t pos;
paulo@0 94
paulo@0 95 if (jack_transport_query (client, &pos)
paulo@0 96 != JackTransportRolling) {
paulo@0 97
paulo@0 98 process_silence (nframes);
paulo@0 99 return 0;
paulo@0 100 }
paulo@0 101 offset = pos.frame % wave_length;
paulo@0 102 }
paulo@0 103 process_audio (nframes);
paulo@0 104 return 0;
paulo@0 105 }
paulo@0 106
paulo@0 107 int
paulo@0 108 sample_rate_change () {
paulo@0 109 printf("Sample rate has changed! Exiting...\n");
paulo@0 110 exit(-1);
paulo@0 111 }
paulo@0 112
paulo@0 113 int
paulo@0 114 main (int argc, char *argv[])
paulo@0 115 {
paulo@0 116
paulo@0 117 sample_t scale;
paulo@0 118 int i, attack_length, decay_length;
paulo@0 119 double *amp;
paulo@0 120 double max_amp = 0.5;
paulo@0 121 int option_index;
paulo@0 122 int opt;
paulo@0 123 int got_bpm = 0;
paulo@0 124 int attack_percent = 1, decay_percent = 10, dur_arg = 100;
paulo@0 125 char *client_name = 0;
paulo@0 126 char *bpm_string = "bpm";
paulo@0 127 int verbose = 0;
paulo@0 128 jack_status_t status;
paulo@0 129
paulo@0 130 const char *options = "f:A:D:a:d:b:n:thv";
paulo@0 131 struct option long_options[] =
paulo@0 132 {
paulo@0 133 {"frequency", 1, 0, 'f'},
paulo@0 134 {"amplitude", 1, 0, 'A'},
paulo@0 135 {"duration", 1, 0, 'D'},
paulo@0 136 {"attack", 1, 0, 'a'},
paulo@0 137 {"decay", 1, 0, 'd'},
paulo@0 138 {"bpm", 1, 0, 'b'},
paulo@0 139 {"name", 1, 0, 'n'},
paulo@0 140 {"transport", 0, 0, 't'},
paulo@0 141 {"help", 0, 0, 'h'},
paulo@0 142 {"verbose", 0, 0, 'v'},
paulo@0 143 {0, 0, 0, 0}
paulo@0 144 };
paulo@0 145
paulo@0 146 while ((opt = getopt_long (argc, argv, options, long_options, &option_index)) != EOF) {
paulo@0 147 switch (opt) {
paulo@0 148 case 'f':
paulo@0 149 if ((freq = atoi (optarg)) <= 0) {
paulo@0 150 fprintf (stderr, "invalid frequency\n");
paulo@0 151 return -1;
paulo@0 152 }
paulo@0 153 break;
paulo@0 154 case 'A':
paulo@0 155 if (((max_amp = atof (optarg)) <= 0)|| (max_amp > 1)) {
paulo@0 156 fprintf (stderr, "invalid amplitude\n");
paulo@0 157 return -1;
paulo@0 158 }
paulo@0 159 break;
paulo@0 160 case 'D':
paulo@0 161 dur_arg = atoi (optarg);
paulo@0 162 fprintf (stderr, "durarg = %u\n", dur_arg);
paulo@0 163 break;
paulo@0 164 case 'a':
paulo@0 165 if (((attack_percent = atoi (optarg)) < 0) || (attack_percent > 100)) {
paulo@0 166 fprintf (stderr, "invalid attack percent\n");
paulo@0 167 return -1;
paulo@0 168 }
paulo@0 169 break;
paulo@0 170 case 'd':
paulo@0 171 if (((decay_percent = atoi (optarg)) < 0) || (decay_percent > 100)) {
paulo@0 172 fprintf (stderr, "invalid decay percent\n");
paulo@0 173 return -1;
paulo@0 174 }
paulo@0 175 break;
paulo@0 176 case 'b':
paulo@0 177 got_bpm = 1;
paulo@0 178 if ((bpm = atoi (optarg)) < 0) {
paulo@0 179 fprintf (stderr, "invalid bpm\n");
paulo@0 180 return -1;
paulo@0 181 }
paulo@0 182 bpm_string = (char *) malloc ((strlen (optarg) + 4) * sizeof (char));
paulo@0 183 strcpy (bpm_string, optarg);
paulo@0 184 strcat (bpm_string, "_bpm");
paulo@0 185 break;
paulo@0 186 case 'n':
paulo@0 187 client_name = (char *) malloc (strlen (optarg) * sizeof (char));
paulo@0 188 strcpy (client_name, optarg);
paulo@0 189 break;
paulo@0 190 case 'v':
paulo@0 191 verbose = 1;
paulo@0 192 break;
paulo@0 193 case 't':
paulo@0 194 transport_aware = 1;
paulo@0 195 break;
paulo@0 196 default:
paulo@0 197 fprintf (stderr, "unknown option %c\n", opt);
paulo@0 198 case 'h':
paulo@0 199 usage ();
paulo@0 200 return -1;
paulo@0 201 }
paulo@0 202 }
paulo@0 203 if (!got_bpm) {
paulo@0 204 fprintf (stderr, "bpm not specified\n");
paulo@0 205 usage ();
paulo@0 206 return -1;
paulo@0 207 }
paulo@0 208
paulo@0 209 /* Initial Jack setup, get sample rate */
paulo@0 210 if (!client_name) {
paulo@0 211 client_name = (char *) malloc (9 * sizeof (char));
paulo@0 212 strcpy (client_name, "metro");
paulo@0 213 }
paulo@0 214 if ((client = jack_client_open (client_name, JackNoStartServer, &status)) == 0) {
paulo@0 215 fprintf (stderr, "jack server not running?\n");
paulo@0 216 return 1;
paulo@0 217 }
paulo@0 218 jack_set_process_callback (client, process, 0);
paulo@0 219 output_port = jack_port_register (client, bpm_string, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
paulo@0 220
paulo@0 221 sr = jack_get_sample_rate (client);
paulo@0 222
paulo@0 223 /* setup wave table parameters */
paulo@0 224 wave_length = 60 * sr / bpm;
paulo@0 225 tone_length = sr * dur_arg / 1000;
paulo@0 226 attack_length = tone_length * attack_percent / 100;
paulo@0 227 decay_length = tone_length * decay_percent / 100;
paulo@0 228 scale = 2 * PI * freq / sr;
paulo@0 229
paulo@0 230 if (tone_length >= wave_length) {
paulo@0 231 fprintf (stderr, "invalid duration (tone length = %" PRIu32
paulo@0 232 ", wave length = %" PRIu32 "\n", tone_length,
paulo@0 233 wave_length);
paulo@0 234 return -1;
paulo@0 235 }
paulo@0 236 if (attack_length + decay_length > (int)tone_length) {
paulo@0 237 fprintf (stderr, "invalid attack/decay\n");
paulo@0 238 return -1;
paulo@0 239 }
paulo@0 240
paulo@0 241 /* Build the wave table */
paulo@0 242 wave = (sample_t *) malloc (wave_length * sizeof(sample_t));
paulo@0 243 amp = (double *) malloc (tone_length * sizeof(double));
paulo@0 244
paulo@0 245 for (i = 0; i < attack_length; i++) {
paulo@0 246 amp[i] = max_amp * i / ((double) attack_length);
paulo@0 247 }
paulo@0 248 for (i = attack_length; i < (int)tone_length - decay_length; i++) {
paulo@0 249 amp[i] = max_amp;
paulo@0 250 }
paulo@0 251 for (i = (int)tone_length - decay_length; i < (int)tone_length; i++) {
paulo@0 252 amp[i] = - max_amp * (i - (double) tone_length) / ((double) decay_length);
paulo@0 253 }
paulo@0 254 for (i = 0; i < (int)tone_length; i++) {
paulo@0 255 wave[i] = amp[i] * sin (scale * i);
paulo@0 256 }
paulo@0 257 for (i = tone_length; i < (int)wave_length; i++) {
paulo@0 258 wave[i] = 0;
paulo@0 259 }
paulo@0 260
paulo@0 261 if (jack_activate (client)) {
paulo@0 262 fprintf (stderr, "cannot activate client");
paulo@0 263 return 1;
paulo@0 264 }
paulo@0 265
paulo@0 266 while (1) {
paulo@0 267 sleep(1);
paulo@0 268 };
paulo@0 269
paulo@0 270 }