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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 "output/MultipleOutputs.hxx"
#include "MixerControl.hxx"
#include "MixerInternal.hxx"
#include "MixerList.hxx"
#include "lib/fmt/ExceptionFormatter.hxx"
#include "pcm/Volume.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <cassert>
static constexpr Domain mixer_domain("mixer");
gcc_pure
static int
output_mixer_get_volume(const AudioOutputControl &ao) noexcept
{
auto *mixer = ao.GetMixer();
if (mixer == nullptr)
return -1;
/* software mixers are always considered, even if they are
disabled */
if (!ao.IsEnabled() && !mixer->IsPlugin(software_mixer_plugin))
return -1;
try {
return mixer_get_volume(mixer);
} catch (...) {
FmtError(mixer_domain,
"Failed to read mixer for '{}': {}",
ao.GetName(), std::current_exception());
return -1;
}
}
int
MultipleOutputs::GetVolume() const noexcept
{
unsigned ok = 0;
int total = 0;
for (const auto &ao : outputs) {
int volume = output_mixer_get_volume(*ao);
if (volume >= 0) {
total += volume;
++ok;
}
}
if (ok == 0)
return -1;
return total / ok;
}
enum class SetVolumeResult {
NO_MIXER,
DISABLED,
ERROR,
OK,
};
static SetVolumeResult
output_mixer_set_volume(AudioOutputControl &ao, unsigned volume)
{
assert(volume <= 100);
auto *mixer = ao.GetMixer();
if (mixer == nullptr)
return SetVolumeResult::NO_MIXER;
/* software mixers are always updated, even if they are
disabled */
if (!mixer->IsPlugin(software_mixer_plugin) &&
/* "global" mixers can be used even if the output hasn't
been used yet */
!(mixer->IsGlobal() ? ao.IsEnabled() : ao.IsReallyEnabled()))
return SetVolumeResult::DISABLED;
try {
mixer_set_volume(mixer, volume);
return SetVolumeResult::OK;
} catch (...) {
FmtError(mixer_domain,
"Failed to set mixer for '{}': {}",
ao.GetName(), std::current_exception());
std::throw_with_nested(std::runtime_error(fmt::format("Failed to set mixer for '{}'",
ao.GetName())));
}
}
void
MultipleOutputs::SetVolume(unsigned volume)
{
assert(volume <= 100);
SetVolumeResult result = SetVolumeResult::NO_MIXER;
std::exception_ptr error;
for (const auto &ao : outputs) {
try {
auto r = output_mixer_set_volume(*ao, volume);
if (r > result)
result = r;
} catch (...) {
/* remember the first error */
if (!error) {
error = std::current_exception();
result = SetVolumeResult::ERROR;
}
}
}
switch (result) {
case SetVolumeResult::NO_MIXER:
throw std::runtime_error{"No mixer"};
case SetVolumeResult::DISABLED:
throw std::runtime_error{"All outputs are disabled"};
case SetVolumeResult::ERROR:
std::rethrow_exception(error);
case SetVolumeResult::OK:
break;
}
}
static int
output_mixer_get_software_volume(const AudioOutputControl &ao) noexcept
{
if (!ao.IsEnabled())
return -1;
auto *mixer = ao.GetMixer();
if (mixer == nullptr || !mixer->IsPlugin(software_mixer_plugin))
return -1;
return mixer_get_volume(mixer);
}
int
MultipleOutputs::GetSoftwareVolume() const noexcept
{
unsigned ok = 0;
int total = 0;
for (const auto &ao : outputs) {
int volume = output_mixer_get_software_volume(*ao);
if (volume >= 0) {
total += volume;
++ok;
}
}
if (ok == 0)
return -1;
return total / ok;
}
void
MultipleOutputs::SetSoftwareVolume(unsigned volume) noexcept
{
assert(volume <= PCM_VOLUME_1);
for (const auto &ao : outputs) {
auto *mixer = ao->GetMixer();
if (mixer != nullptr &&
(mixer->IsPlugin(software_mixer_plugin) ||
mixer->IsPlugin(null_mixer_plugin)))
mixer_set_volume(mixer, volume);
}
}