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/*
* Copyright 2003-2021 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 "mixer/MixerInternal.hxx"
#include "config/Block.hxx"
#include "io/FileDescriptor.hxx"
#include "system/Error.hxx"
#include "util/ASCII.hxx"
#include "util/Domain.hxx"
#include "util/RuntimeError.hxx"
#include "Log.hxx"
#include <cassert>
#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;
FileDescriptor device_fd;
int volume_control;
public:
OssMixer(MixerListener &_listener, const ConfigBlock &block)
:Mixer(oss_mixer_plugin, _listener) {
Configure(block);
}
void Configure(const ConfigBlock &block);
/* virtual methods from class Mixer */
void Open() override;
void Close() noexcept override;
int GetVolume() override;
void SetVolume(unsigned volume) 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 void
OssMixer::Configure(const ConfigBlock &block)
{
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)
throw FormatRuntimeError("no such mixer control: %s",
control);
} else
volume_control = SOUND_MIXER_PCM;
}
static Mixer *
oss_mixer_init([[maybe_unused]] EventLoop &event_loop,
[[maybe_unused]] AudioOutput &ao,
MixerListener &listener,
const ConfigBlock &block)
{
return new OssMixer(listener, block);
}
void
OssMixer::Close() noexcept
{
assert(device_fd.IsDefined());
device_fd.Close();
}
void
OssMixer::Open()
{
device_fd.OpenReadOnly(device);
if (!device_fd.IsDefined())
throw FormatErrno("failed to open %s", device);
try {
if (control) {
int devmask = 0;
if (ioctl(device_fd.Get(), SOUND_MIXER_READ_DEVMASK, &devmask) < 0)
throw MakeErrno("READ_DEVMASK failed");
if (((1 << volume_control) & devmask) == 0)
throw FormatErrno("mixer control \"%s\" not usable",
control);
}
} catch (...) {
Close();
throw;
}
}
int
OssMixer::GetVolume()
{
int left, right, level;
int ret;
assert(device_fd.IsDefined());
ret = ioctl(device_fd.Get(), MIXER_READ(volume_control), &level);
if (ret < 0)
throw MakeErrno("failed to read OSS volume");
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;
}
void
OssMixer::SetVolume(unsigned volume)
{
int level;
assert(device_fd.IsDefined());
assert(volume <= 100);
level = (volume << 8) + volume;
if (ioctl(device_fd.Get(), MIXER_WRITE(volume_control), &level) < 0)
throw MakeErrno("failed to set OSS volume");
}
constexpr MixerPlugin oss_mixer_plugin = {
oss_mixer_init,
true,
};
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