1 /*****************************************************************************
3 * This file is part of jack_mixer
5 * Copyright (C) 2006 Nedko Arnaudov <nedko@arnaudov.name>
6 * Copyright (C) 2009-2011 Frederic Peters <fpeters@0d.be>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *****************************************************************************/
24 * jack_mix_box is a most minimalistic jack mixer, a set of mono/sterero input
25 * channels, mixed to a single output channel, with the volume of the
26 * input channels controlled by MIDI control change (CC) codes.
37 #include "jack_mixer.h"
40 bool keepRunning = true;
47 printf("\tjack_mix_box [ -n|--name <jack client name> ] [ -s|--stereo ] [ -v|--volume <initial vol> ] MIDI_CC_1 MIDI_CC_2 ...\n");
48 printf("\tsend SIGUSR1 to the process to have the current columes reported per input channel\n\n");
55 channels_volumes_read(mixer);
59 triggerShutDown(int sig)
66 main(int argc, char *argv[])
68 jack_mixer_scale_t scale;
69 jack_mixer_channel_t main_mix_channel;
70 char *jack_cli_name = NULL;
73 double initialVolume = 0.0f; //in dbFS
77 static struct option long_options[] =
79 {"name", required_argument, 0, 'n'},
80 {"help", required_argument, 0, 'h'},
81 {"stereo", required_argument, 0, 's'},
82 {"volume", required_argument, 0, 'v'},
87 c = getopt_long (argc, argv, "shn:v:", long_options, &option_index);
93 jack_cli_name = strdup(optarg);
99 initialVolume = strtod(optarg, NULL);
106 fprintf(stderr, "Unknown argument, aborting.\n");
111 if (optind == argc) {
112 fprintf(stderr, "You must specify at least one input channel\n");
116 scale = scale_create();
117 scale_add_threshold(scale, -70.0, 0.0);
118 scale_add_threshold(scale, 0.0, 1.0);
119 scale_calculate_coefficients(scale);
121 if (jack_cli_name == NULL) {
122 jack_cli_name = strdup("jack_mix_box");
125 mixer = create(jack_cli_name, false);
126 main_mix_channel = add_output_channel(mixer, "MAIN", true, false);
127 channel_set_midi_scale(main_mix_channel, scale);
128 channel_volume_write(main_mix_channel, 0.0);
131 while (optind < argc) {
133 jack_mixer_channel_t channel;
136 channel_name = malloc(15);
137 if (snprintf(channel_name, 15, "Channel %d", channel_index) >= 15) {
141 channel = add_channel(mixer, channel_name, bStereo);
142 if (channel == NULL) {
143 fprintf(stderr, "Failed to add channel %d, aborting\n", channel_index);
146 channel_set_volume_midi_cc(channel, atoi(argv[optind++]));
147 channel_set_midi_scale(channel, scale);
148 channel_volume_write(channel, initialVolume);
152 signal(SIGUSR1, reportVolume);
153 signal(SIGTERM, triggerShutDown);
154 signal(SIGHUP, triggerShutDown);
155 signal(SIGINT, triggerShutDown);
157 while (keepRunning) {
158 usleep(500u * 1000u); //500msec
161 remove_channels(mixer);
162 remove_output_channel(main_mix_channel);
164 scale_destroy(scale);