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/*
* 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);
/* 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, GetVolume(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 ¶m,
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 = online
? (int)((100 * (pa_cvolume_avg(&volume) + 1)) / PA_VOLUME_NORM)
: -1;
pulse_output_unlock(output);
return result;
}
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,
};
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