1/* mix.c - A very basic mixer. 2 * 3 * Copyright 2014 Brad Conroy, dedicated to the Public Domain. 4 * 5 6USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN)) 7 8config 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 26GLOBALS( 27 long r, l; 28 char *d, *c; 29) 30 31void mix_main(void) 32{ 33 const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES; 34 int mask, channel = -1, level, fd; 35 36 if (!TT.d) TT.d = "/dev/mixer"; 37 fd = xopen(TT.d, O_RDWR|O_NONBLOCK); 38 xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask); 39 40 for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) { 41 if ((1<<channel) & mask) { 42 if (TT.c) { 43 if (!strcmp(channels[channel], TT.c)) break; 44 } else if (toys.optflags & FLAG_l) break; 45 else printf("%s\n", channels[channel]); 46 } 47 } 48 49 if (!(toys.optflags & (FLAG_c|FLAG_l))) return; 50 else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.c); 51 52 if (!(toys.optflags & FLAG_l)) { 53 xioctl(fd, MIXER_READ(channel), &level); 54 if (level > 0xFF) 55 xprintf("%s:%s = left:%d\t right:%d\n", 56 TT.d, channels[channel], level>>8, level & 0xFF); 57 else xprintf("%s:%s = %d\n", TT.d, channels[channel], level); 58 } else { 59 level = TT.l; 60 if (!(toys.optflags & FLAG_r)) level = TT.r | (level<<8); 61 62 xioctl(fd, MIXER_WRITE(channel), &level); 63 } 64 65 if (CFG_TOYBOX_FREE) close(fd); 66} 67