mixer.c revision 6448
1/* 2 * This is an example of a mixer program for Linux 3 * 4 * updated 1/1/93 to add stereo, level query, broken 5 * devmask kludge - cmetz@thor.tjhsst.edu 6 * 7 * (C) Craig Metz and Hannu Savolainen 1993. 8 * 9 * You may do anything you wish with this program. 10 */ 11 12#include <stdio.h> 13#include <fcntl.h> 14#include <string.h> 15#ifdef __FreeBSD__ 16#include <machine/soundcard.h> 17#else 18#include <sys/soundcard.h> 19#endif 20 21char *names[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES; 22 23int devmask = 0, recmask = 0, recsrc = 0; 24 25void usage(void) 26{ 27 int i, n = 0; 28 printf("Usage: mixer { "); 29 30 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 31 if ((1 << i) & devmask) { 32 if (n) 33 putchar('|'); 34 printf(names[i]); 35 n = 1; 36 } 37 printf(" } <value>\n or mixer { +rec|-rec } <devicename>\n"); 38 exit(1); 39} 40 41void print_recsrc(void) 42{ 43 int i, n = 0; 44 fprintf(stderr, "Recording source: "); 45 46 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 47 if ((1 << i) & recsrc) { 48 if (n) 49 fprintf(stderr, ", "); 50 fprintf(stderr, names[i]); 51 n = 1; 52 } 53 fprintf(stderr, "\n"); 54} 55 56int 57main(int argc, char *argv[]) 58{ 59 int foo, bar, baz, dev; 60 61 char name[30] = "/dev/mixer"; 62 63 if (!strcmp(argv[0], "mixer2")) 64 strcpy(name, "/dev/mixer1"); 65 else 66 if (!strcmp(argv[0], "mixer3")) 67 strcpy(name, "/dev/mixer2"); 68 69 if ((baz = open(name, O_RDWR)) < 0) { 70 perror(name); 71 exit(1); 72 } 73 if (ioctl(baz, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) { 74 perror("SOUND_MIXER_READ_DEVMASK"); 75 exit(-1); 76 } 77 if (ioctl(baz, SOUND_MIXER_READ_RECMASK, &recmask) == -1) { 78 perror("SOUND_MIXER_READ_RECMASK"); 79 exit(-1); 80 } 81 if (ioctl(baz, SOUND_MIXER_READ_RECSRC, &recsrc) == -1) { 82 perror("SOUND_MIXER_READ_RECSRC"); 83 exit(-1); 84 } 85 86 switch (argc) { 87 case 3: 88 bar = 1; 89 break; 90 case 2: 91 bar = 0; 92 break; 93 default: 94 usage(); 95 } 96 97 for (foo = 0; foo < SOUND_MIXER_NRDEVICES && strcmp(names[foo], argv[1]); foo++); 98 99 if (foo >= SOUND_MIXER_NRDEVICES) { 100 101 if (!strcmp("+rec", argv[1]) || !strcmp("-rec", argv[1])) { 102 for (dev = 0; dev < SOUND_MIXER_NRDEVICES && strcmp(names[dev], argv[2]); dev++); 103 if (dev >= SOUND_MIXER_NRDEVICES) 104 usage(); 105 106 if (!((1 << dev) & recmask)) { 107 fprintf(stderr, "Invalid recording source %s\n", argv[2]); 108 exit(-1); 109 } 110 if (argv[1][0] == '+') 111 recsrc |= (1 << dev); 112 else 113 recsrc &= ~(1 << dev); 114 115 if (ioctl(baz, SOUND_MIXER_WRITE_RECSRC, &recsrc) == -1) { 116 perror("SOUND_MIXER_WRITE_RECSRC"); 117 exit(-1); 118 } 119 print_recsrc(); 120 121 } else 122 usage(); 123 } else { 124 if (bar) { 125 if (strchr(argv[2], ':') == NULL) { 126 sscanf(argv[2], "%d", &bar); 127 dev = bar; 128 } else 129 sscanf(argv[2], "%d:%d", &bar, &dev); 130 131 if (bar < 0) 132 bar = 0; 133 if (dev < 0) 134 dev = 0; 135 if (bar > 100) 136 bar = 100; 137 if (dev > 100) 138 dev = 100; 139 140 printf("Setting the mixer %s to %d:%d.\n", names[foo], bar, dev); 141 142 bar |= dev << 8; 143 if (ioctl(baz, MIXER_WRITE(foo), &bar) == -1) 144 perror("WRITE_MIXER"); 145 return (0); 146 } else { 147 if (ioctl(baz, MIXER_READ(foo),&bar)== -1) 148 perror("MIXER_READ"); 149 printf("The mixer %s is currently set to %d:%d.\n", names[foo], bar & 0x7f, (bar >> 8) & 0x7f); 150 } 151 } 152 153 close(baz); 154} 155