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/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.
  27  *
  28  */
  29
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdbool.h>
  34 #include <getopt.h>
  35 #include <signal.h>
  36 #include "jack_mixer.h"
  37
  38 jack_mixer_t mixer;
  39
  40 void
  41 usage()
  42 {
  43
  44         printf("Usage:\n");
  45         printf("\tjack_mix_box [ -n|--name <jack client name> ] [ -s|--stereo ] [ -v|--volume <initial vol> ] MIDI_CC_1 MIDI_CC_2 ...\n");
  46         printf("\tsend SIGUSR1 to the process to have the current columes reported per input channel\n\n");
  47 }
  48
  49 void
  50 reportVolume(int sig)
  51 {
  52         (void)sig;
  53         channels_volumes_read(mixer);
  54 }
  55
  56 int
  57 main(int argc, char *argv[])
  58 {
  59         jack_mixer_scale_t scale;
  60         jack_mixer_channel_t main_mix_channel;
  61         char *jack_cli_name = NULL;
  62         int channel_index;
  63         bool bStereo = false;
  64         double initialVolume = 0.0f; //in dbFS
  65
  66         while (1) {
  67                 int c;
  68                 static struct option long_options[] =
  69                 {
  70                         {"name",  required_argument, 0, 'n'},
  71                         {"help",  required_argument, 0, 'h'},
  72                         {"stereo",  required_argument, 0, 's'},
  73                         {"volume",  required_argument, 0, 'v'},
  74                         {0, 0, 0, 0}
  75                 };
  76                 int option_index = 0;
  77
  78                 c = getopt_long (argc, argv, "shn:v:", long_options, &option_index);
  79                 if (c == -1)
  80                         break;
  81
  82                 switch (c) {
  83                         case 'n':
  84                                 jack_cli_name = strdup(optarg);
  85                                 break;
  86                         case 's':
  87                                 bStereo = true;
  88                                 break;
  89                         case 'v':
  90                                 initialVolume = strtod(optarg, NULL);
  91                                 break;
  92                         case 'h':
  93                                 usage();
  94                                 exit(0);
  95                                 break;
  96                         default:
  97                                 fprintf(stderr, "Unknown argument, aborting.\n");
  98                                 exit(1);
  99                 }
 100         }
 101
 102         if (optind == argc) {
 103                 fprintf(stderr, "You must specify at least one input channel\n");
 104                 exit(1);
 105         }
 106
 107         scale = scale_create();
 108         scale_add_threshold(scale, -70.0, 0.0);
 109         scale_add_threshold(scale, 0.0, 1.0);
 110         scale_calculate_coefficients(scale);
 111
 112         if (jack_cli_name == NULL) {
 113                 jack_cli_name = strdup("jack_mix_box");
 114         }
 115
 116         mixer = create(jack_cli_name, false);
 117         main_mix_channel = add_output_channel(mixer, "MAIN", true, false);
 118         channel_set_midi_scale(main_mix_channel, scale);
 119         channel_volume_write(main_mix_channel, 0.0);
 120
 121         channel_index = 0;
 122         while (optind < argc) {
 123                 char *channel_name;
 124                 jack_mixer_channel_t channel;
 125
 126                 channel_index += 1;
 127                 channel_name = malloc(15);
 128                 if (snprintf(channel_name, 15, "Channel %d", channel_index) >= 15) {
 129                         abort();
 130                 }
 131                 channel = add_channel(mixer, channel_name, bStereo);
 132                 if (channel == NULL) {
 133                         fprintf(stderr, "Failed to add channel %d, aborting\n", channel_index);
 134                         exit(1);
 135                 }
 136                 channel_set_volume_midi_cc(channel, atoi(argv[optind++]));
 137                 channel_set_midi_scale(channel, scale);
 138                 channel_volume_write(channel, initialVolume);
 139         }
 140
 141         signal(SIGUSR1, reportVolume);
 142
 143         while (true) {
 144                 sleep(1);
 145         }
 146
 147         return 0;
 148 }