1 /* mix.c - A very basic mixer. 2 * 3 * Copyright 2014 Brad Conroy, dedicated to the Public Domain. 4 * 5 6 USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN)) 7 8 config MIX 9 bool "mix" 10 default y 11 help 12 usage: mix [-d DEV] [-c CHANNEL] [-l VOL] [-r RIGHT] 13 14 List OSS sound channels (module snd-mixer-oss), or set volume(s). 15 16 -c CHANNEL Set/show volume of CHANNEL (default first channel found) 17 -d DEV Device node (default /dev/mixer) 18 -l VOL Volume level 19 -r RIGHT Volume of right stereo channel (with -r, -l sets left volume) 20 */ 21 22 #define FOR_mix 23 #include "toys.h" 24 #include <linux/soundcard.h> 25 26 GLOBALS( 27 long right; 28 long level; 29 char *dev; 30 char *chan; 31 ) 32 33 void mix_main(void) 34 { 35 const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES; 36 int mask, channel = -1, level, fd; 37 38 if (!TT.dev) TT.dev = "/dev/mixer"; 39 fd = xopen(TT.dev, O_RDWR|O_NONBLOCK); 40 xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask); 41 42 for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) { 43 if ((1<<channel) & mask) { 44 if (TT.chan) { 45 if (!strcmp(channels[channel], TT.chan)) break; 46 } else if (toys.optflags & FLAG_l) break; 47 else printf("%s\n", channels[channel]); 48 } 49 } 50 51 if (!(toys.optflags & (FLAG_c|FLAG_l))) return; 52 else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.chan); 53 54 if (!(toys.optflags & FLAG_l)) { 55 xioctl(fd, MIXER_READ(channel), &level); 56 if (level > 0xFF) 57 xprintf("%s:%s = left:%d\t right:%d\n", 58 TT.dev, channels[channel], level>>8, level & 0xFF); 59 else xprintf("%s:%s = %d\n", TT.dev, channels[channel], level); 60 } else { 61 level = TT.level; 62 if (!(toys.optflags & FLAG_r)) level = TT.right | (level<<8); 63 64 xioctl(fd, MIXER_WRITE(channel), &level); 65 } 66 67 if (CFG_TOYBOX_FREE) close(fd); 68 } 69
