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/*
* Copyright (C) 2003-2015 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "mixer/MixerInternal.hxx"
#include "config/Block.hxx"
#include "system/fd_util.h"
#include "util/ASCII.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <assert.h>
#include <string.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#if defined(__OpenBSD__) || defined(__NetBSD__)
# include <soundcard.h>
#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
# include <sys/soundcard.h>
#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
class OssMixer final : public Mixer {
const char *device;
const char *control;
int device_fd;
int volume_control;
public:
OssMixer(MixerListener &_listener)
:Mixer(oss_mixer_plugin, _listener) {}
bool Configure(const ConfigBlock &block, Error &error);
/* virtual methods from class Mixer */
virtual bool Open(Error &error) override;
virtual void Close() override;
virtual int GetVolume(Error &error) override;
virtual bool SetVolume(unsigned volume, Error &error) override;
};
static constexpr Domain oss_mixer_domain("oss_mixer");
static int
oss_find_mixer(const char *name)
{
const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
size_t name_length = strlen(name);
for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (StringEqualsCaseASCII(name, labels[i], name_length) &&
(labels[i][name_length] == 0 ||
labels[i][name_length] == ' '))
return i;
}
return -1;
}
inline bool
OssMixer::Configure(const ConfigBlock &block, Error &error)
{
device = block.GetBlockValue("mixer_device", VOLUME_MIXER_OSS_DEFAULT);
control = block.GetBlockValue("mixer_control");
if (control != NULL) {
volume_control = oss_find_mixer(control);
if (volume_control < 0) {
error.Format(oss_mixer_domain, 0,
"no such mixer control: %s", control);
return false;
}
} else
volume_control = SOUND_MIXER_PCM;
return true;
}
static Mixer *
oss_mixer_init(gcc_unused EventLoop &event_loop, gcc_unused AudioOutput &ao,
MixerListener &listener,
const ConfigBlock &block,
Error &error)
{
OssMixer *om = new OssMixer(listener);
if (!om->Configure(block, error)) {
delete om;
return nullptr;
}
return om;
}
void
OssMixer::Close()
{
assert(device_fd >= 0);
close(device_fd);
}
bool
OssMixer::Open(Error &error)
{
device_fd = open_cloexec(device, O_RDONLY, 0);
if (device_fd < 0) {
error.FormatErrno("failed to open %s", device);
return false;
}
if (control) {
int devmask = 0;
if (ioctl(device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
error.SetErrno("READ_DEVMASK failed");
Close();
return false;
}
if (((1 << volume_control) & devmask) == 0) {
error.Format(oss_mixer_domain, 0,
"mixer control \"%s\" not usable",
control);
Close();
return false;
}
}
return true;
}
int
OssMixer::GetVolume(Error &error)
{
int left, right, level;
int ret;
assert(device_fd >= 0);
ret = ioctl(device_fd, MIXER_READ(volume_control), &level);
if (ret < 0) {
error.SetErrno("failed to read OSS volume");
return false;
}
left = level & 0xff;
right = (level & 0xff00) >> 8;
if (left != right) {
FormatWarning(oss_mixer_domain,
"volume for left and right is not the same, \"%i\" and "
"\"%i\"\n", left, right);
}
return left;
}
bool
OssMixer::SetVolume(unsigned volume, Error &error)
{
int level;
int ret;
assert(device_fd >= 0);
assert(volume <= 100);
level = (volume << 8) + volume;
ret = ioctl(device_fd, MIXER_WRITE(volume_control), &level);
if (ret < 0) {
error.SetErrno("failed to set OSS volume");
return false;
}
return true;
}
const MixerPlugin oss_mixer_plugin = {
oss_mixer_init,
true,
};
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