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;
46 printf("jack_mix_box [-n <name>] [-p] [-s] [-v <dB>] MIDI_CC...\n");
48 printf("-h|--help\tprint this help message\n");
49 printf("-n|--name\tset JACK client name\n");
50 printf("-p|--pickup\tenable MIDI pickup mode (default: jump-to-value)\n");
51 printf("-s|--stereo\tmake all input channels stereo with left+right input\n");
52 printf("-v|--volume\tinitial volume gain in dB, default is 0.0 (i.e. unity gain)\n");
54 printf("Each positional argument is interpreted as a MIDI Control Change number and adds\n");
55 printf("a mixer channel with one (mono) or left+right (stereo) inputs, whose volume can\n");
56 printf("be controlled via the given MIDI Control Change.\n");
58 printf("Send SIGUSR1 to the process to have the current volumes reported per input channel.\n\n");
65 channels_volumes_read(mixer
);
69 triggerShutDown(int sig
)
76 main(int argc
, char *argv
[])
78 jack_mixer_scale_t scale
;
79 jack_mixer_channel_t main_mix_channel
;
80 char *jack_cli_name
= NULL
;
83 enum midi_behavior_mode ePickup
= Jump_To_Value
;
84 double initialVolume
= 0.0f
; //in dbFS
88 static struct option long_options
[] =
90 {"name", required_argument
, 0, 'n'},
91 {"help", no_argument
, 0, 'h'},
92 {"pickup", no_argument
, 0, 'p'},
93 {"stereo", no_argument
, 0, 's'},
94 {"volume", required_argument
, 0, 'v'},
99 c
= getopt_long (argc
, argv
, "sphn:v:", long_options
, &option_index
);
105 jack_cli_name
= strdup(optarg
);
111 initialVolume
= strtod(optarg
, NULL
);
121 fprintf(stderr
, "Unknown argument, aborting.\n");
126 if (optind
== argc
) {
127 fprintf(stderr
, "You must specify at least one input channel\n");
131 scale
= scale_create();
132 scale_add_threshold(scale
, -70.0, 0.0);
133 scale_add_threshold(scale
, 0.0, 1.0);
134 scale_calculate_coefficients(scale
);
136 if (jack_cli_name
== NULL
) {
137 jack_cli_name
= strdup("jack_mix_box");
140 mixer
= create(jack_cli_name
, false);
141 main_mix_channel
= add_output_channel(mixer
, "MAIN", true, false);
142 channel_set_midi_scale(main_mix_channel
, scale
);
143 channel_volume_write(main_mix_channel
, 0.0);
144 set_midi_behavior_mode(mixer
, ePickup
);
147 while (optind
< argc
) {
149 jack_mixer_channel_t channel
;
152 channel_name
= malloc(15);
153 if (snprintf(channel_name
, 15, "Channel %d", channel_index
) >= 15) {
157 channel
= add_channel(mixer
, channel_name
, bStereo
);
158 if (channel
== NULL
) {
159 fprintf(stderr
, "Failed to add channel %d, aborting\n", channel_index
);
162 channel_set_volume_midi_cc(channel
, atoi(argv
[optind
++]));
163 channel_set_midi_scale(channel
, scale
);
164 channel_volume_write(channel
, initialVolume
);
168 signal(SIGUSR1
, reportVolume
);
169 signal(SIGTERM
, triggerShutDown
);
170 signal(SIGHUP
, triggerShutDown
);
171 signal(SIGINT
, triggerShutDown
);
173 while (keepRunning
) {
174 usleep(500u * 1000u); //500msec
177 remove_channels(mixer
);
178 remove_output_channel(main_mix_channel
);
180 scale_destroy(scale
);