/*
    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 <dcp/warnings.h>
LIBDCP_DISABLE_WARNINGS
#include <RtAudio.h>
LIBDCP_ENABLE_WARNINGS
#include <wx/wx.h>
#include <boost/optional.hpp>
#include <boost/thread/mutex.hpp>



class AudioBackend
{
public:
	AudioBackend();

	AudioBackend(AudioBackend const&) = delete;
	AudioBackend& operator=(AudioBackend const&) = delete;

	std::vector<std::string> device_names();
	boost::optional<std::string> default_device_name();
	boost::optional<int> device_channels(std::string name);

	bool open_stream(RtAudioCallback callback, void* context, int* channels, unsigned int* block_size, boost::optional<std::string> output);
	boost::optional<std::string> start_stream();
	void abort_stream_if_running();
	void close_stream();

	bool stream_open() const;
	bool stream_running() const;
	double stream_time() const;
	int64_t stream_latency() const;

	void set_stream_time(double time);

	wxString current_api_name() const;

#if (RTAUDIO_VERSION_MAJOR >= 6)
	std::string last_error() const;
#endif

	static AudioBackend* instance();

private:
	static AudioBackend* _instance;

	RtAudio _rtaudio;

#if (RTAUDIO_VERSION_MAJOR >= 6)
	void rtaudio_error_callback(std::string const& error);
	mutable boost::mutex _last_error_mutex;
	std::string _last_error;
#endif
};