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annotate toys/other/mix.c @ 1776:7bf68329eb3b draft default tip

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Repository switched to git at https://github.com/landley/toybox
author Rob Landley <rob@landley.net>
date Thu, 09 Apr 2015 02:28:32 -0500
parents 93c5e6163f9b
children
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b513c9c64c71 mix.c - A very basic mixer.
Bradley Conroy <bradley.conroy@gmail.com>
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1 /* mix.c - A very basic mixer.
b513c9c64c71 mix.c - A very basic mixer.
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2 *
b513c9c64c71 mix.c - A very basic mixer.
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3 * Copyright 2014 Brad Conroy, dedicated to the Public Domain.
b513c9c64c71 mix.c - A very basic mixer.
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4 *
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5
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6 USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN))
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7
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8 config MIX
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9 bool "mix"
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10 default y
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11 help
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12 usage: mix [-d DEV] [-c CHANNEL] [-l VOL] [-r RIGHT]
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13
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14 List OSS sound channels (module snd-mixer-oss), or set volume(s).
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15
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16 -c CHANNEL Set/show volume of CHANNEL (default first channel found)
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17 -d DEV Device node (default /dev/mixer)
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18 -l VOL Volume level
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19 -r RIGHT Volume of right stereo channel (with -r, -l sets left volume)
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20 */
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21
b513c9c64c71 mix.c - A very basic mixer.
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22 #define FOR_mix
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23 #include "toys.h"
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24 #include <linux/soundcard.h>
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25
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26 GLOBALS(
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27 long right;
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28 long level;
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29 char *dev;
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30 char *chan;
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31 )
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32
b513c9c64c71 mix.c - A very basic mixer.
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33 void mix_main(void)
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34 {
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35 const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
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36 int mask, channel = -1, level, fd;
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37
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38 if (!TT.dev) TT.dev = "/dev/mixer";
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39 fd = xopen(TT.dev, O_RDWR|O_NONBLOCK);
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40 xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask);
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41
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42 for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) {
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43 if ((1<<channel) & mask) {
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44 if (TT.chan) {
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45 if (!strcmp(channels[channel], TT.chan)) break;
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46 } else if (toys.optflags & FLAG_l) break;
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47 else printf("%s\n", channels[channel]);
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48 }
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49 }
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50
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51 if (!(toys.optflags & (FLAG_c|FLAG_l))) return;
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52 else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.chan);
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53
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54 if (!(toys.optflags & FLAG_l)) {
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55 xioctl(fd, MIXER_READ(channel), &level);
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56 if (level > 0xFF)
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57 xprintf("%s:%s = left:%d\t right:%d\n",
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58 TT.dev, channels[channel], level>>8, level & 0xFF);
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59 else xprintf("%s:%s = %d\n", TT.dev, channels[channel], level);
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60 } else {
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61 level = TT.level;
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62 if (!(toys.optflags & FLAG_r)) level = TT.right | (level<<8);
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63
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64 xioctl(fd, MIXER_WRITE(channel), &level);
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65 }
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66
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67 if (CFG_TOYBOX_FREE) close(fd);
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68 }