8 files changed, 1189 insertions, 0 deletions

diff --git a/src/mixer/plugins/AlsaMixerPlugin.cxx b/src/mixer/plugins/AlsaMixerPlugin.cxx
new file mode 100644
index 000000000..cd787182a
--- /dev/null
+++ b/src/mixer/plugins/AlsaMixerPlugin.cxx
@@ -0,0 +1,357 @@
+/*
+ * Copyright (C) 2003-2014 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 "mixer/Listener.hxx"
+#include "output/OutputAPI.hxx"
+#include "event/MultiSocketMonitor.hxx"
+#include "event/DeferredMonitor.hxx"
+#include "event/Loop.hxx"
+#include "util/ASCII.hxx"
+#include "util/ReusableArray.hxx"
+#include "util/Clamp.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <algorithm>
+
+#include <alsa/asoundlib.h>
+
+#define VOLUME_MIXER_ALSA_DEFAULT		"default"
+#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT	"PCM"
+static constexpr unsigned VOLUME_MIXER_ALSA_INDEX_DEFAULT = 0;
+
+class AlsaMixerMonitor final : MultiSocketMonitor, DeferredMonitor {
+	snd_mixer_t *mixer;
+
+	ReusableArray<pollfd> pfd_buffer;
+
+public:
+	AlsaMixerMonitor(EventLoop &_loop, snd_mixer_t *_mixer)
+		:MultiSocketMonitor(_loop), DeferredMonitor(_loop),
+		 mixer(_mixer) {
+		DeferredMonitor::Schedule();
+	}
+
+private:
+	virtual void RunDeferred() override {
+		InvalidateSockets();
+	}
+
+	virtual int PrepareSockets() override;
+	virtual void DispatchSockets() override;
+};
+
+class AlsaMixer final : public Mixer {
+	EventLoop &event_loop;
+
+	const char *device;
+	const char *control;
+	unsigned int index;
+
+	snd_mixer_t *handle;
+	snd_mixer_elem_t *elem;
+	long volume_min;
+	long volume_max;
+	int volume_set;
+
+	AlsaMixerMonitor *monitor;
+
+public:
+	AlsaMixer(EventLoop &_event_loop, MixerListener &_listener)
+		:Mixer(alsa_mixer_plugin, _listener),
+		 event_loop(_event_loop) {}
+
+	virtual ~AlsaMixer();
+
+	void Configure(const config_param &param);
+	bool Setup(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 alsa_mixer_domain("alsa_mixer");
+
+int
+AlsaMixerMonitor::PrepareSockets()
+{
+	if (mixer == nullptr) {
+		ClearSocketList();
+		return -1;
+	}
+
+	int count = snd_mixer_poll_descriptors_count(mixer);
+	if (count < 0)
+		count = 0;
+
+	struct pollfd *pfds = pfd_buffer.Get(count);
+
+	count = snd_mixer_poll_descriptors(mixer, pfds, count);
+	if (count < 0)
+		count = 0;
+
+	ReplaceSocketList(pfds, count);
+	return -1;
+}
+
+void
+AlsaMixerMonitor::DispatchSockets()
+{
+	assert(mixer != nullptr);
+
+	int err = snd_mixer_handle_events(mixer);
+	if (err < 0) {
+		FormatError(alsa_mixer_domain,
+			    "snd_mixer_handle_events() failed: %s",
+			    snd_strerror(err));
+
+		if (err == -ENODEV) {
+			/* the sound device was unplugged; disable
+			   this GSource */
+			mixer = nullptr;
+			InvalidateSockets();
+			return;
+		}
+	}
+}
+
+/*
+ * libasound callbacks
+ *
+ */
+
+static int
+alsa_mixer_elem_callback(snd_mixer_elem_t *elem, unsigned mask)
+{
+	AlsaMixer &mixer = *(AlsaMixer *)
+		snd_mixer_elem_get_callback_private(elem);
+
+	if (mask & SND_CTL_EVENT_MASK_VALUE) {
+		int volume = mixer.GetVolume(IgnoreError());
+		mixer.listener.OnMixerVolumeChanged(mixer, volume);
+	}
+
+	return 0;
+}
+
+/*
+ * mixer_plugin methods
+ *
+ */
+
+inline void
+AlsaMixer::Configure(const config_param &param)
+{
+	device = param.GetBlockValue("mixer_device",
+				     VOLUME_MIXER_ALSA_DEFAULT);
+	control = param.GetBlockValue("mixer_control",
+				      VOLUME_MIXER_ALSA_CONTROL_DEFAULT);
+	index = param.GetBlockValue("mixer_index",
+				    VOLUME_MIXER_ALSA_INDEX_DEFAULT);
+}
+
+static Mixer *
+alsa_mixer_init(EventLoop &event_loop, gcc_unused AudioOutput &ao,
+		MixerListener &listener,
+		const config_param &param,
+		gcc_unused Error &error)
+{
+	AlsaMixer *am = new AlsaMixer(event_loop, listener);
+	am->Configure(param);
+
+	return am;
+}
+
+AlsaMixer::~AlsaMixer()
+{
+	/* free libasound's config cache */
+	snd_config_update_free_global();
+}
+
+gcc_pure
+static snd_mixer_elem_t *
+alsa_mixer_lookup_elem(snd_mixer_t *handle, const char *name, unsigned idx)
+{
+	for (snd_mixer_elem_t *elem = snd_mixer_first_elem(handle);
+	     elem != nullptr; elem = snd_mixer_elem_next(elem)) {
+		if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE &&
+		    StringEqualsCaseASCII(snd_mixer_selem_get_name(elem),
+					  name) &&
+		    snd_mixer_selem_get_index(elem) == idx)
+			return elem;
+	}
+
+	return nullptr;
+}
+
+inline bool
+AlsaMixer::Setup(Error &error)
+{
+	int err;
+
+	if ((err = snd_mixer_attach(handle, device)) < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "failed to attach to %s: %s",
+			     device, snd_strerror(err));
+		return false;
+	}
+
+	if ((err = snd_mixer_selem_register(handle, nullptr,
+		    nullptr)) < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "snd_mixer_selem_register() failed: %s",
+			     snd_strerror(err));
+		return false;
+	}
+
+	if ((err = snd_mixer_load(handle)) < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "snd_mixer_load() failed: %s\n",
+			     snd_strerror(err));
+		return false;
+	}
+
+	elem = alsa_mixer_lookup_elem(handle, control, index);
+	if (elem == nullptr) {
+		error.Format(alsa_mixer_domain, 0,
+			    "no such mixer control: %s", control);
+		return false;
+	}
+
+	snd_mixer_selem_get_playback_volume_range(elem, &volume_min,
+						  &volume_max);
+
+	snd_mixer_elem_set_callback_private(elem, this);
+	snd_mixer_elem_set_callback(elem, alsa_mixer_elem_callback);
+
+	monitor = new AlsaMixerMonitor(event_loop, handle);
+
+	return true;
+}
+
+inline bool
+AlsaMixer::Open(Error &error)
+{
+	int err;
+
+	volume_set = -1;
+
+	err = snd_mixer_open(&handle, 0);
+	if (err < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "snd_mixer_open() failed: %s", snd_strerror(err));
+		return false;
+	}
+
+	if (!Setup(error)) {
+		snd_mixer_close(handle);
+		return false;
+	}
+
+	return true;
+}
+
+inline void
+AlsaMixer::Close()
+{
+	assert(handle != nullptr);
+
+	delete monitor;
+
+	snd_mixer_elem_set_callback(elem, nullptr);
+	snd_mixer_close(handle);
+}
+
+inline int
+AlsaMixer::GetVolume(Error &error)
+{
+	int err;
+	int ret;
+	long level;
+
+	assert(handle != nullptr);
+
+	err = snd_mixer_handle_events(handle);
+	if (err < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "snd_mixer_handle_events() failed: %s",
+			     snd_strerror(err));
+		return false;
+	}
+
+	err = snd_mixer_selem_get_playback_volume(elem,
+						  SND_MIXER_SCHN_FRONT_LEFT,
+						  &level);
+	if (err < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "failed to read ALSA volume: %s",
+			     snd_strerror(err));
+		return false;
+	}
+
+	ret = ((volume_set / 100.0) * (volume_max - volume_min)
+	       + volume_min) + 0.5;
+	if (volume_set > 0 && ret == level) {
+		ret = volume_set;
+	} else {
+		ret = (int)(100 * (((float)(level - volume_min)) /
+				   (volume_max - volume_min)) + 0.5);
+	}
+
+	return ret;
+}
+
+inline bool
+AlsaMixer::SetVolume(unsigned volume, Error &error)
+{
+	float vol;
+	long level;
+	int err;
+
+	assert(handle != nullptr);
+
+	vol = volume;
+
+	volume_set = vol + 0.5;
+
+	level = (long)(((vol / 100.0) * (volume_max - volume_min) +
+			volume_min) + 0.5);
+	level = Clamp(level, volume_min, volume_max);
+
+	err = snd_mixer_selem_set_playback_volume_all(elem, level);
+	if (err < 0) {
+		error.Format(alsa_mixer_domain, err,
+			     "failed to set ALSA volume: %s",
+			     snd_strerror(err));
+		return false;
+	}
+
+	return true;
+}
+
+const MixerPlugin alsa_mixer_plugin = {
+	alsa_mixer_init,
+	true,
+};
diff --git a/src/mixer/plugins/OssMixerPlugin.cxx b/src/mixer/plugins/OssMixerPlugin.cxx
new file mode 100644
index 000000000..6615c7022
--- /dev/null
+++ b/src/mixer/plugins/OssMixerPlugin.cxx
@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2003-2014 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/ConfigData.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 config_param &param, 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 config_param &param, Error &error)
+{
+	device = param.GetBlockValue("mixer_device", VOLUME_MIXER_OSS_DEFAULT);
+	control = param.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 config_param &param,
+	       Error &error)
+{
+	OssMixer *om = new OssMixer(listener);
+
+	if (!om->Configure(param, 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,
+};
diff --git a/src/mixer/plugins/PulseMixerPlugin.cxx b/src/mixer/plugins/PulseMixerPlugin.cxx
new file mode 100644
index 000000000..c5f20723b
--- /dev/null
+++ b/src/mixer/plugins/PulseMixerPlugin.cxx
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2003-2014 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 "PulseMixerPlugin.hxx"
+#include "mixer/MixerInternal.hxx"
+#include "mixer/Listener.hxx"
+#include "output/plugins/PulseOutputPlugin.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <pulse/context.h>
+#include <pulse/introspect.h>
+#include <pulse/stream.h>
+#include <pulse/subscribe.h>
+#include <pulse/error.h>
+
+#include <assert.h>
+
+class PulseMixer final : public Mixer {
+	PulseOutput &output;
+
+	bool online;
+	struct pa_cvolume volume;
+
+public:
+	PulseMixer(PulseOutput &_output, MixerListener &_listener)
+		:Mixer(pulse_mixer_plugin, _listener),
+		 output(_output), online(false)
+	{
+	}
+
+	virtual ~PulseMixer();
+
+	void Offline();
+	void VolumeCallback(const pa_sink_input_info *i, int eol);
+	void Update(pa_context *context, pa_stream *stream);
+	int GetVolumeInternal(Error &error);
+
+	/* virtual methods from class Mixer */
+	virtual bool Open(gcc_unused Error &error) override {
+		return true;
+	}
+
+	virtual void Close() override {
+	}
+
+	virtual int GetVolume(Error &error) override;
+	virtual bool SetVolume(unsigned volume, Error &error) override;
+};
+
+static constexpr Domain pulse_mixer_domain("pulse_mixer");
+
+void
+PulseMixer::Offline()
+{
+	if (!online)
+		return;
+
+	online = false;
+
+	listener.OnMixerVolumeChanged(*this, -1);
+}
+
+inline void
+PulseMixer::VolumeCallback(const pa_sink_input_info *i, int eol)
+{
+	if (eol)
+		return;
+
+	if (i == nullptr) {
+		Offline();
+		return;
+	}
+
+	online = true;
+	volume = i->volume;
+
+	listener.OnMixerVolumeChanged(*this, GetVolumeInternal(IgnoreError()));
+}
+
+/**
+ * Callback invoked by pulse_mixer_update().  Receives the new mixer
+ * value.
+ */
+static void
+pulse_mixer_volume_cb(gcc_unused pa_context *context, const pa_sink_input_info *i,
+		      int eol, void *userdata)
+{
+	PulseMixer *pm = (PulseMixer *)userdata;
+	pm->VolumeCallback(i, eol);
+}
+
+inline void
+PulseMixer::Update(pa_context *context, pa_stream *stream)
+{
+	assert(context != nullptr);
+	assert(stream != nullptr);
+	assert(pa_stream_get_state(stream) == PA_STREAM_READY);
+
+	pa_operation *o =
+		pa_context_get_sink_input_info(context,
+					       pa_stream_get_index(stream),
+					       pulse_mixer_volume_cb, this);
+	if (o == nullptr) {
+		FormatError(pulse_mixer_domain,
+			    "pa_context_get_sink_input_info() failed: %s",
+			    pa_strerror(pa_context_errno(context)));
+		Offline();
+		return;
+	}
+
+	pa_operation_unref(o);
+}
+
+void
+pulse_mixer_on_connect(gcc_unused PulseMixer &pm,
+		       struct pa_context *context)
+{
+	pa_operation *o;
+
+	assert(context != nullptr);
+
+	o = pa_context_subscribe(context,
+				 (pa_subscription_mask_t)PA_SUBSCRIPTION_MASK_SINK_INPUT,
+				 nullptr, nullptr);
+	if (o == nullptr) {
+		FormatError(pulse_mixer_domain,
+			    "pa_context_subscribe() failed: %s",
+			    pa_strerror(pa_context_errno(context)));
+		return;
+	}
+
+	pa_operation_unref(o);
+}
+
+void
+pulse_mixer_on_disconnect(PulseMixer &pm)
+{
+	pm.Offline();
+}
+
+void
+pulse_mixer_on_change(PulseMixer &pm,
+		      struct pa_context *context, struct pa_stream *stream)
+{
+	pm.Update(context, stream);
+}
+
+static Mixer *
+pulse_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
+		 MixerListener &listener,
+		 gcc_unused const config_param &param,
+		 gcc_unused Error &error)
+{
+	PulseOutput &po = (PulseOutput &)ao;
+	PulseMixer *pm = new PulseMixer(po, listener);
+
+	pulse_output_set_mixer(po, *pm);
+
+	return pm;
+}
+
+PulseMixer::~PulseMixer()
+{
+	pulse_output_clear_mixer(output, *this);
+}
+
+int
+PulseMixer::GetVolume(gcc_unused Error &error)
+{
+	pulse_output_lock(output);
+
+	int result = GetVolumeInternal(error);
+	pulse_output_unlock(output);
+
+	return result;
+}
+
+/**
+ * Pulse mainloop lock must be held by caller
+ */
+int
+PulseMixer::GetVolumeInternal(gcc_unused Error &error)
+{
+	return online ?
+		(int)((100 * (pa_cvolume_avg(&volume) + 1)) / PA_VOLUME_NORM)
+		: -1;
+}
+
+bool
+PulseMixer::SetVolume(unsigned new_volume, Error &error)
+{
+	pulse_output_lock(output);
+
+	if (!online) {
+		pulse_output_unlock(output);
+		error.Set(pulse_mixer_domain, "disconnected");
+		return false;
+	}
+
+	struct pa_cvolume cvolume;
+	pa_cvolume_set(&cvolume, volume.channels,
+		       (pa_volume_t)new_volume * PA_VOLUME_NORM / 100 + 0.5);
+	bool success = pulse_output_set_volume(output, &cvolume, error);
+	if (success)
+		volume = cvolume;
+
+	pulse_output_unlock(output);
+	return success;
+}
+
+const MixerPlugin pulse_mixer_plugin = {
+	pulse_mixer_init,
+	false,
+};
diff --git a/src/mixer/plugins/PulseMixerPlugin.hxx b/src/mixer/plugins/PulseMixerPlugin.hxx
new file mode 100644
index 000000000..9b3a6daf1
--- /dev/null
+++ b/src/mixer/plugins/PulseMixerPlugin.hxx
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+#ifndef MPD_PULSE_MIXER_PLUGIN_HXX
+#define MPD_PULSE_MIXER_PLUGIN_HXX
+
+class PulseMixer;
+struct pa_context;
+struct pa_stream;
+
+void
+pulse_mixer_on_connect(PulseMixer &pm, pa_context *context);
+
+void
+pulse_mixer_on_disconnect(PulseMixer &pm);
+
+void
+pulse_mixer_on_change(PulseMixer &pm, pa_context *context, pa_stream *stream);
+
+#endif
diff --git a/src/mixer/plugins/RoarMixerPlugin.cxx b/src/mixer/plugins/RoarMixerPlugin.cxx
new file mode 100644
index 000000000..8e198478d
--- /dev/null
+++ b/src/mixer/plugins/RoarMixerPlugin.cxx
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright (C) 2010-2011 Philipp 'ph3-der-loewe' Schafft
+ * Copyright (C) 2010-2011 Hans-Kristian 'maister' Arntzen
+ *
+ * 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 "output/plugins/RoarOutputPlugin.hxx"
+#include "Compiler.h"
+
+class RoarMixer final : public Mixer {
+	/** the base mixer class */
+	RoarOutput &self;
+
+public:
+	RoarMixer(RoarOutput &_output, MixerListener &_listener)
+		:Mixer(roar_mixer_plugin, _listener),
+		 self(_output) {}
+
+	/* virtual methods from class Mixer */
+	virtual bool Open(gcc_unused Error &error) override {
+		return true;
+	}
+
+	virtual void Close() override {
+	}
+
+	virtual int GetVolume(Error &error) override;
+	virtual bool SetVolume(unsigned volume, Error &error) override;
+};
+
+static Mixer *
+roar_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
+		MixerListener &listener,
+		gcc_unused const config_param &param,
+		gcc_unused Error &error)
+{
+	return new RoarMixer((RoarOutput &)ao, listener);
+}
+
+int
+RoarMixer::GetVolume(gcc_unused Error &error)
+{
+	return roar_output_get_volume(self);
+}
+
+bool
+RoarMixer::SetVolume(unsigned volume, gcc_unused Error &error)
+{
+	return roar_output_set_volume(self, volume);
+}
+
+const MixerPlugin roar_mixer_plugin = {
+	roar_mixer_init,
+	false,
+};
diff --git a/src/mixer/plugins/SoftwareMixerPlugin.cxx b/src/mixer/plugins/SoftwareMixerPlugin.cxx
new file mode 100644
index 000000000..f14766002
--- /dev/null
+++ b/src/mixer/plugins/SoftwareMixerPlugin.cxx
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2003-2014 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 "SoftwareMixerPlugin.hxx"
+#include "mixer/MixerInternal.hxx"
+#include "filter/FilterPlugin.hxx"
+#include "filter/FilterRegistry.hxx"
+#include "filter/FilterInternal.hxx"
+#include "filter/plugins/VolumeFilterPlugin.hxx"
+#include "pcm/Volume.hxx"
+#include "config/ConfigData.hxx"
+#include "util/Error.hxx"
+
+#include <assert.h>
+#include <math.h>
+
+static Filter *
+CreateVolumeFilter()
+{
+	return filter_new(&volume_filter_plugin, config_param(),
+			  IgnoreError());
+}
+
+class SoftwareMixer final : public Mixer {
+	Filter *filter;
+
+	/**
+	 * If this is true, then this object "owns" the #Filter
+	 * instance (see above).  It will be set to false by
+	 * software_mixer_get_filter(); after that, the caller will be
+	 * responsible for the #Filter.
+	 */
+	bool owns_filter;
+
+	/**
+	 * The current volume in percent (0..100).
+	 */
+	unsigned volume;
+
+public:
+	SoftwareMixer(MixerListener &_listener)
+		:Mixer(software_mixer_plugin, _listener),
+		 filter(CreateVolumeFilter()),
+		 owns_filter(true),
+		 volume(100)
+	{
+		assert(filter != nullptr);
+	}
+
+	virtual ~SoftwareMixer() {
+		if (owns_filter)
+			delete filter;
+	}
+
+	Filter *GetFilter();
+
+	/* virtual methods from class Mixer */
+	virtual bool Open(gcc_unused Error &error) override {
+		return true;
+	}
+
+	virtual void Close() override {
+	}
+
+	virtual int GetVolume(gcc_unused Error &error) override {
+		return volume;
+	}
+
+	virtual bool SetVolume(unsigned volume, Error &error) override;
+};
+
+static Mixer *
+software_mixer_init(gcc_unused EventLoop &event_loop,
+		    gcc_unused AudioOutput &ao,
+		    MixerListener &listener,
+		    gcc_unused const config_param &param,
+		    gcc_unused Error &error)
+{
+	return new SoftwareMixer(listener);
+}
+
+gcc_const
+static unsigned
+PercentVolumeToSoftwareVolume(unsigned volume)
+{
+	assert(volume <= 100);
+
+	if (volume >= 100)
+		return PCM_VOLUME_1;
+	else if (volume > 0)
+		return pcm_float_to_volume((exp(volume / 25.0) - 1) /
+					   (54.5981500331F - 1));
+	else
+		return 0;
+}
+
+bool
+SoftwareMixer::SetVolume(unsigned new_volume, gcc_unused Error &error)
+{
+	assert(new_volume <= 100);
+
+	volume = new_volume;
+	volume_filter_set(filter, PercentVolumeToSoftwareVolume(new_volume));
+	return true;
+}
+
+const MixerPlugin software_mixer_plugin = {
+	software_mixer_init,
+	true,
+};
+
+inline Filter *
+SoftwareMixer::GetFilter()
+{
+	assert(owns_filter);
+
+	owns_filter = false;
+	return filter;
+}
+
+Filter *
+software_mixer_get_filter(Mixer *mixer)
+{
+	SoftwareMixer *sm = (SoftwareMixer *)mixer;
+	assert(sm->IsPlugin(software_mixer_plugin));
+	return sm->GetFilter();
+}
diff --git a/src/mixer/plugins/SoftwareMixerPlugin.hxx b/src/mixer/plugins/SoftwareMixerPlugin.hxx
new file mode 100644
index 000000000..581d2ac17
--- /dev/null
+++ b/src/mixer/plugins/SoftwareMixerPlugin.hxx
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+#ifndef MPD_SOFTWARE_MIXER_PLUGIN_HXX
+#define MPD_SOFTWARE_MIXER_PLUGIN_HXX
+
+class Mixer;
+class Filter;
+
+/**
+ * Returns the (volume) filter associated with this mixer.  All users
+ * of this mixer plugin should install this filter.
+ */
+Filter *
+software_mixer_get_filter(Mixer *mixer);
+
+#endif
diff --git a/src/mixer/plugins/WinmmMixerPlugin.cxx b/src/mixer/plugins/WinmmMixerPlugin.cxx
new file mode 100644
index 000000000..e0436011a
--- /dev/null
+++ b/src/mixer/plugins/WinmmMixerPlugin.cxx
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2003-2014 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 "output/OutputAPI.hxx"
+#include "output/plugins/WinmmOutputPlugin.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <mmsystem.h>
+
+#include <assert.h>
+#include <math.h>
+#include <windows.h>
+
+class WinmmMixer final : public Mixer {
+	WinmmOutput &output;
+
+public:
+	WinmmMixer(WinmmOutput &_output, MixerListener &_listener)
+		:Mixer(winmm_mixer_plugin, _listener),
+		output(_output) {
+	}
+
+	/* virtual methods from class Mixer */
+	virtual bool Open(gcc_unused Error &error) override {
+		return true;
+	}
+
+	virtual void Close() override {
+	}
+
+	virtual int GetVolume(Error &error) override;
+	virtual bool SetVolume(unsigned volume, Error &error) override;
+};
+
+static constexpr Domain winmm_mixer_domain("winmm_mixer");
+
+static inline int
+winmm_volume_decode(DWORD volume)
+{
+	return lround((volume & 0xFFFF) / 655.35);
+}
+
+static inline DWORD
+winmm_volume_encode(int volume)
+{
+	int value = lround(volume * 655.35);
+	return MAKELONG(value, value);
+}
+
+static Mixer *
+winmm_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
+		 MixerListener &listener,
+		 gcc_unused const config_param &param,
+		 gcc_unused Error &error)
+{
+	return new WinmmMixer((WinmmOutput &)ao, listener);
+}
+
+int
+WinmmMixer::GetVolume(Error &error)
+{
+	DWORD volume;
+	HWAVEOUT handle = winmm_output_get_handle(output);
+	MMRESULT result = waveOutGetVolume(handle, &volume);
+
+	if (result != MMSYSERR_NOERROR) {
+		error.Set(winmm_mixer_domain, "Failed to get winmm volume");
+		return -1;
+	}
+
+	return winmm_volume_decode(volume);
+}
+
+bool
+WinmmMixer::SetVolume(unsigned volume, Error &error)
+{
+	DWORD value = winmm_volume_encode(volume);
+	HWAVEOUT handle = winmm_output_get_handle(output);
+	MMRESULT result = waveOutSetVolume(handle, value);
+
+	if (result != MMSYSERR_NOERROR) {
+		error.Set(winmm_mixer_domain, "Failed to set winmm volume");
+		return false;
+	}
+
+	return true;
+}
+
+const MixerPlugin winmm_mixer_plugin = {
+	winmm_mixer_init,
+	false,
+};