On Saturday 05 July 2014 20:32:18 bifferos wrote:
> Here's a mixer applet (OSS). It gets the list of mixer devices, gets and
> sets individual device values.
>
>
>
> / # mixer --help
> BusyBox v1.22.1 (2014-06-23 15:19:41 BST) multi-call binary.
>
> Usage: mixer [-d DEVICE] [MIXER [LEVEL]]
>
> Sets the mixer volume at a specific level (0-100)
>
> -d DEVICE use given mixer device (default /dev/mixer)
>
> / # mixer
> Mixer: speaker mic phout
>
> / # mixer speaker
> Level (L/R): 99/99
>
> / # mixer speaker 20
> Level (L/R): 20/20
>
> It adds about about 2.6k to Busybox and I don't really understand why. Even
> with the list of mixers it should only be ~500 bytes.
> If anyone has any suggestions I can try to fix that.
>
>
> regards,
> Biff.
Hi,
just for fun some size reduction.
Tested it a little bit and it seems to work.
Ciao,
Tito
scripts/bloat-o-meter busybox_old busybox_unstripped
function old new delta
pr_level_exit 27 - -27
mixer_main 385 335 -50
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-77) Total: -77 bytes
int mixer_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mixer_main(int argc, char **argv)
{
int fd_mixer;
char* device = (char*)"/dev/mixer";
uint32_t level;
int devmask, n_dev;
const char *m_names[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES ;
/* option handling */
opt_complementary = "?2"; /* must have no more than 2 */
getopt32(argv, "d:", &device);
argc -= optind;
argv += optind;
fd_mixer = xopen(device, O_RDWR);
ioctl_or_perror_and_die(fd_mixer, SOUND_MIXER_READ_DEVMASK, &devmask,
"DEVMASK");
switch (argc) {
case 2:
level = xatoi_range(argv[1], 1, 100);
break;
case 0:
printf("Mixer:");
}
/* mixer device enumeration */
for (n_dev = 0; n_dev < SOUND_MIXER_NRDEVICES; ++n_dev) {
if ((1 << n_dev) & devmask) {
if (*argv) {
if (strcmp(m_names[n_dev], *argv) == 0)
break;
} else {
printf(" %s", m_names[n_dev]);
}
}
}
if (!*argv) {
putchar('\n');
} else {
if (argc == 2) {
/* mixer device setting */
level = (level << 8) + level;
ioctl_or_perror_and_die(fd_mixer, MIXER_WRITE(n_dev),
&level, "MIXER_WRITE");
} else {
/* mixer device reading */
ioctl_or_perror_and_die(fd_mixer, MIXER_READ(n_dev),
&level, "MIXER_READ");
}
printf("Level (l/r): %d/%d\n", level & 0xff, ((level & 0xff00)
>> 8));
}
return 0;
}
/* vi: set sw=4 ts=4: */
/*
* Audio mixer for busybox (OSS emulation only)
*
* Copyright (c) Bifferos (sa...@bifferos.com)
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Setting L/R stereo channels independently is unsupported in order to keep this applet small.
*
*
*/
#include <linux/soundcard.h>
#include "libbb.h"
//usage:#define mixer_trivial_usage
//usage: "[-d DEVICE] [MIXER [LEVEL]]"
//usage:#define mixer_full_usage "\n\n"
//usage: "Sets the mixer volume at a specific level (0-100)\n"
//usage: "\n -d DEVICE use given mixer device (default /dev/mixer)"
//usage:#define mixer_example_usage
//usage: "# mixer vol 50\n"
int mixer_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mixer_main(int argc, char **argv)
{
int fd_mixer;
char* device = (char*)"/dev/mixer";
uint32_t level;
int devmask, n_dev;
const char *m_names[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES ;
/* option handling */
opt_complementary = "?2"; /* must have no more than 2 */
getopt32(argv, "d:", &device);
argc -= optind;
argv += optind;
fd_mixer = xopen(device, O_RDWR);
ioctl_or_perror_and_die(fd_mixer, SOUND_MIXER_READ_DEVMASK, &devmask, "DEVMASK");
switch (argc) {
case 2:
level = xatoi_range(argv[1], 1, 100);
break;
case 0:
printf("Mixer:");
}
/* mixer device enumeration */
for (n_dev = 0; n_dev < SOUND_MIXER_NRDEVICES; ++n_dev) {
if ((1 << n_dev) & devmask) {
if (*argv) {
if (strcmp(m_names[n_dev], *argv) == 0)
break;
} else {
printf(" %s", m_names[n_dev]);
}
}
}
if (!*argv) {
putchar('\n');
} else {
if (argc == 2) {
/* mixer device setting */
level = (level << 8) + level;
ioctl_or_perror_and_die(fd_mixer, MIXER_WRITE(n_dev), &level, "MIXER_WRITE");
} else {
/* mixer device reading */
ioctl_or_perror_and_die(fd_mixer, MIXER_READ(n_dev), &level, "MIXER_READ");
}
printf("Level (l/r): %d/%d\n", level & 0xff, ((level & 0xff00) >> 8));
}
return 0;
}_______________________________________________
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