jack_mix_box.c

   1 /*****************************************************************************
   2  *
   3  *   This file is part of jack_mixer
   4  *
   5  *   Copyright (C) 2006 Nedko Arnaudov <nedko@arnaudov.name>
   6  *   Copyright (C) 2009-2011 Frederic Peters <fpeters@0d.be>
   7  *
   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
  11  *
  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.
  16  *
  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.
  20  *
  21  *****************************************************************************/
  22
  23 /*
  24  * jack_mix_box is a most minimalistic jack mixer, a set of mono input
  25  * channels, mixed to a single output channel, with the volume of the
  26  * input channels controlled by MIDI control change (CC) codes.
  27  *
  28  * Usage:
  29  *   jack_mix_box [ -n JACK_CLI_NAME ] MIDI_CC_1 MIDI_CC_2 ....
  30  */
  31
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <stdbool.h>
  36 #include <getopt.h>
  37 #include "jack_mixer.h"
  38
  39 int
  40 main(int argc, char *argv[])
  41 {
  42         jack_mixer_scale_t scale;
  43         jack_mixer_t mixer;
  44         jack_mixer_channel_t main_mix_channel;
  45         char *jack_cli_name = NULL;
  46         int channel_index;
  47
  48         while (1) {
  49                 int c;
  50                 static struct option long_options[] =
  51                 {
  52                         {"name",  required_argument, 0, 'n'},
  53                         {0, 0, 0, 0}
  54                 };
  55                 int option_index = 0;
  56
  57                 c = getopt_long (argc, argv, "n:", long_options, &option_index);
  58                 if (c == -1)
  59                         break;
  60
  61                 switch (c) {
  62                         case 'n':
  63                                 jack_cli_name = strdup(optarg);
  64                                 break;
  65                         default:
  66                                 fprintf(stderr, "Unknown argument, aborting.\n");
  67                                 exit(1);
  68                 }
  69         }
  70
  71         if (optind == argc) {
  72                 fprintf(stderr, "You must specify at least one input channel\n");
  73                 exit(1);
  74         }
  75
  76         scale = scale_create();
  77         scale_add_threshold(scale, -70.0, 0.0);
  78         scale_add_threshold(scale, 0.0, 1.0);
  79         scale_calculate_coefficients(scale);
  80
  81         if (jack_cli_name == NULL) {
  82                 jack_cli_name = strdup("jack_mix_box");
  83         }
  84
  85         mixer = create(jack_cli_name, false);
  86         main_mix_channel = get_main_mix_channel(mixer);
  87         channel_set_midi_scale(main_mix_channel, scale);
  88         channel_volume_write(main_mix_channel, 0);
  89         channel_set_volume_midi_cc(main_mix_channel, 0);
  90
  91         channel_index = 0;
  92         while (optind < argc) {
  93                 char *channel_name;
  94                 jack_mixer_channel_t channel;
  95
  96                 channel_index += 1;
  97                 channel_name = malloc(15);
  98                 if (snprintf(channel_name, 15, "Channel %d", channel_index) >= 15) {
  99                         abort();
 100                 }
 101                 channel = add_channel(mixer, channel_name, false);
 102                 if (channel == NULL) {
 103                         fprintf(stderr, "Failed to add channel %d, aborting\n", channel_index);
 104                         exit(1);
 105                 }
 106                 channel_set_volume_midi_cc(channel, atoi(argv[optind++]));
 107                 channel_set_midi_scale(channel, scale);
 108                 channel_volume_write(channel, 0);
 109         }
 110
 111         while (true) {
 112                 sleep(1);
 113         }
 114
 115         return 0;
 116 }