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/*
Copyright (C) 2024 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "audio_backend.h"
#include <boost/bind/bind.hpp>
using std::string;
using std::vector;
using boost::optional;
#if BOOST_VERSION >= 106100
using namespace boost::placeholders;
#endif
AudioBackend* AudioBackend::_instance = nullptr;
#ifdef DCPOMATIC_LINUX
auto constexpr api = RtAudio::LINUX_PULSE;
#endif
#ifdef DCPOMATIC_WINDOWS
auto constexpr api = RtAudio::UNSPECIFIED;
#endif
#ifdef DCPOMATIC_OSX
auto constexpr api = RtAudio::MACOSX_CORE;
#endif
AudioBackend::AudioBackend()
#if (RTAUDIO_VERSION_MAJOR >= 6)
: _rtaudio(api, boost::bind(&AudioBackend::rtaudio_error_callback, this, _2))
#else
: _rtaudio(api)
#endif
{
}
#if (RTAUDIO_VERSION_MAJOR >= 6)
void
AudioBackend::rtaudio_error_callback(string const& error)
{
boost::mutex::scoped_lock lm(_last_error_mutex);
_last_error = error;
}
string
AudioBackend::last_error() const
{
boost::mutex::scoped_lock lm(_last_error_mutex);
return _last_error;
}
#endif
AudioBackend*
AudioBackend::instance()
{
if (!_instance) {
_instance = new AudioBackend();
}
return _instance;
}
vector<string>
AudioBackend::device_names()
{
vector<string> names;
#if (RTAUDIO_VERSION_MAJOR >= 6)
for (auto device_id: _rtaudio.getDeviceIds()) {
auto dev = _rtaudio.getDeviceInfo(device_id);
if (dev.outputChannels > 0) {
names.push_back(dev.name);
}
}
#else
for (unsigned int i = 0; i < _rtaudio.getDeviceCount(); ++i) {
try {
auto dev = _rtaudio.getDeviceInfo(i);
if (dev.probed && dev.outputChannels > 0) {
names.push_back(dev.name);
}
} catch (RtAudioError&) {
/* Something went wrong so let's just ignore that device */
}
}
#endif
return names;
}
optional<string>
AudioBackend::default_device_name()
{
#if (RTAUDIO_VERSION_MAJOR >= 6)
return _rtaudio.getDeviceInfo(_rtaudio.getDefaultOutputDevice()).name;
#else
try {
return _rtaudio.getDeviceInfo(_rtaudio.getDefaultOutputDevice()).name;
} catch (RtAudioError&) {
/* Never mind */
}
#endif
return {};
}
optional<int>
AudioBackend::device_channels(string name)
{
#if (RTAUDIO_VERSION_MAJOR >= 6)
for (auto device_id: _rtaudio.getDeviceIds()) {
auto info = _rtaudio.getDeviceInfo(device_id);
if (info.name == name) {
return info.outputChannels;
}
}
#else
for (unsigned int i = 0; i < _rtaudio.getDeviceCount(); ++i) {
try {
auto info = _rtaudio.getDeviceInfo(i);
if (info.name == name) {
return info.outputChannels;
}
} catch (RtAudioError&) {
/* Never mind */
}
}
#endif
return {};
}
void
AudioBackend::abort_stream_if_running()
{
if (_rtaudio.isStreamRunning()) {
_rtaudio.abortStream();
}
}
optional<string>
AudioBackend::start_stream()
{
#if (RTAUDIO_VERSION_MAJOR >= 6)
if (_rtaudio.startStream() != RTAUDIO_NO_ERROR) {
return last_error();
}
#else
try {
_rtaudio.startStream();
} catch (RtAudioError& e) {
return string(e.what());
}
#endif
return {};
}
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