1 files changed, 67 insertions, 0 deletions
diff --git a/toys/other/mix.c b/toys/other/mix.c
new file mode 100644
index 00000000..2b8165e3
--- /dev/null
+++ b/toys/other/mix.c
@@ -0,0 +1,67 @@
+/* mix.c - A very basic mixer.
+ *
+ * Copyright 2014 Brad Conroy, dedicated to the Public Domain.
+ *
+
+USE_MIX(NEWTOY(mix, "c:d:l#r#", TOYFLAG_USR|TOYFLAG_BIN))
+
+config MIX
+  bool "mix"
+  default y
+  help
+   usage: mix [-m DEV] [-d CHANNEL] [-l VOL] [-r RIGHT]
+
+   List OSS sound channels (module snd-mixer-oss), or set volume(s).
+
+   -d DEV		Device node (default /dev/mixer)
+   -l VOL		Volume level
+   -c CHANNEL	Set/show volume of CHANNEL (default first channel found)
+   -r RIGHT	Volume of right stereo channel (with -r, -l sets left volume)
+*/
+
+#define FOR_mix
+#include "toys.h"
+#include <linux/soundcard.h>
+
+GLOBALS(
+   long right;
+   long level;
+   char *dev;
+   char *chan;
+)
+
+void mix_main(void)
+{
+  const char *channels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
+  int mask, channel = -1, level, fd;
+
+  if (!TT.dev) TT.dev = "/dev/mixer";
+  fd = xopen(TT.dev, O_RDWR|O_NONBLOCK);
+  xioctl(fd, SOUND_MIXER_READ_DEVMASK, &mask);
+
+  for (channel = 0; channel < SOUND_MIXER_NRDEVICES; channel++) {
+    if ((1<<channel) & mask) {
+      if (TT.chan && !strcmp(channels[channel], TT.chan)) break;
+      else if (toys.optflags & FLAG_l) break;
+      else printf("%s\n", channels[channel]);
+    }
+  }
+
+  if (!(toys.optflags & (FLAG_c|FLAG_l))) return;
+  else if (channel == SOUND_MIXER_NRDEVICES) error_exit("bad -c '%s'", TT.chan);
+
+  if (!(toys.optflags & FLAG_l)) {
+    xioctl(fd, MIXER_READ(channel), &level);
+    if (level > 0xFF)
+      xprintf("%s:%s = left:%d\t right:%d\n",
+              TT.dev, channels[channel], level>>8, level & 0xFF);
+    else xprintf("%s:%s = %d\n", TT.dev, channels[channel], level);
+  } else {
+    level = TT.level;
+    if (!(toys.optflags & FLAG_r)) level = TT.right | (level<<8);
+
+    xioctl(fd, MIXER_WRITE(channel), &level);
+  }
+
+  if (CFG_TOYBOX_FREE) close(fd);
+}