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
);