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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 "MixerInternal.hxx"
#include "output/PulseOutputPlugin.hxx"
#include "GlobalEvents.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>
struct PulseMixer final : public Mixer {
PulseOutput *output;
bool online;
struct pa_cvolume volume;
PulseMixer(PulseOutput *_output)
:Mixer(pulse_mixer_plugin),
output(_output), online(false)
{
}
};
static constexpr Domain pulse_mixer_domain("pulse_mixer");
static void
pulse_mixer_offline(PulseMixer *pm)
{
if (!pm->online)
return;
pm->online = false;
GlobalEvents::Emit(GlobalEvents::MIXER);
}
/**
* 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;
if (eol)
return;
if (i == nullptr) {
pulse_mixer_offline(pm);
return;
}
pm->online = true;
pm->volume = i->volume;
GlobalEvents::Emit(GlobalEvents::MIXER);
}
static void
pulse_mixer_update(PulseMixer *pm,
struct pa_context *context, struct pa_stream *stream)
{
pa_operation *o;
assert(context != nullptr);
assert(stream != nullptr);
assert(pa_stream_get_state(stream) == PA_STREAM_READY);
o = pa_context_get_sink_input_info(context,
pa_stream_get_index(stream),
pulse_mixer_volume_cb, pm);
if (o == nullptr) {
FormatError(pulse_mixer_domain,
"pa_context_get_sink_input_info() failed: %s",
pa_strerror(pa_context_errno(context)));
pulse_mixer_offline(pm);
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)
{
pulse_mixer_offline(pm);
}
void
pulse_mixer_on_change(PulseMixer *pm,
struct pa_context *context, struct pa_stream *stream)
{
pulse_mixer_update(pm, context, stream);
}
static Mixer *
pulse_mixer_init(void *ao, gcc_unused const config_param ¶m,
Error &error)
{
PulseOutput *po = (PulseOutput *)ao;
if (ao == nullptr) {
error.Set(pulse_mixer_domain,
"The pulse mixer cannot work without the audio output");
return nullptr;
}
PulseMixer *pm = new PulseMixer(po);
pulse_output_set_mixer(po, pm);
return pm;
}
static void
pulse_mixer_finish(Mixer *data)
{
PulseMixer *pm = (PulseMixer *) data;
pulse_output_clear_mixer(pm->output, pm);
delete pm;
}
static int
pulse_mixer_get_volume(Mixer *mixer, gcc_unused Error &error)
{
PulseMixer *pm = (PulseMixer *) mixer;
int ret;
pulse_output_lock(pm->output);
ret = pm->online
? (int)((100*(pa_cvolume_avg(&pm->volume)+1))/PA_VOLUME_NORM)
: -1;
pulse_output_unlock(pm->output);
return ret;
}
static bool
pulse_mixer_set_volume(Mixer *mixer, unsigned volume, Error &error)
{
PulseMixer *pm = (PulseMixer *) mixer;
struct pa_cvolume cvolume;
bool success;
pulse_output_lock(pm->output);
if (!pm->online) {
pulse_output_unlock(pm->output);
error.Set(pulse_mixer_domain, "disconnected");
return false;
}
pa_cvolume_set(&cvolume, pm->volume.channels,
(pa_volume_t)volume * PA_VOLUME_NORM / 100 + 0.5);
success = pulse_output_set_volume(pm->output, &cvolume, error);
if (success)
pm->volume = cvolume;
pulse_output_unlock(pm->output);
return success;
}
const struct mixer_plugin pulse_mixer_plugin = {
pulse_mixer_init,
pulse_mixer_finish,
nullptr,
nullptr,
pulse_mixer_get_volume,
pulse_mixer_set_volume,
false,
};
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