livetrax/libs/backends/portaudio/portaudio_io.h

/*
 * Copyright (C) 2015 Robin Gareus <robin@gareus.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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __libbackend_portaudio_pcmio_h__
#define __libbackend_portaudio_pcmio_h__

#include <map>
#include <vector>
#include <string>
#include <boost/shared_ptr.hpp>

#include <stdint.h>

#include <portaudio.h>

namespace ARDOUR {

class PortAudioIO {
public:
	PortAudioIO (void);
	~PortAudioIO (void);

	int      state (void) const { return _state; }

	enum StandardDevices {
		DeviceNone = -2,
		DeviceDefault = -1
	};

	bool     initialize_pa ();

	void host_api_list (std::vector<std::string>&);
	bool set_host_api (const std::string& host_api_name);
	std::string get_host_api () const { return _host_api_name; }
	PaHostApiTypeId get_current_host_api_type () const;
	PaHostApiIndex get_host_api_index_from_name (const std::string& name);

	PaDeviceIndex get_default_input_device ();
	PaDeviceIndex get_default_output_device ();

	void     discover();
	void     input_device_list (std::map<int, std::string> &devices) const;
	void     output_device_list (std::map<int, std::string> &devices) const;

	int available_sample_rates (int device_id, std::vector<float>& sample_rates);
	int available_buffer_sizes (int device_id, std::vector<uint32_t>& buffer_sizes);

#ifdef WITH_ASIO
	bool get_asio_buffer_properties (int device_id,
	                                 long& min_size_frames,
	                                 long& max_size_frames,
	                                 long& preferred_size_frames,
	                                 long& granularity);

	bool get_asio_buffer_sizes (int device_id, std::vector<uint32_t>& buffer_size);
#endif

	std::string control_app_name (int device_id) const;
	void launch_control_app (int device_id);

	void     pcm_stop (void);
	int      pcm_start (void);

	int      pcm_setup (
			int device_input,
			int device_output,
			double   sample_rate,
			uint32_t samples_per_period
			);

	uint32_t n_playback_channels (void) const { return _playback_channels; }
	uint32_t n_capture_channels (void) const { return _capture_channels; }

	std::string get_input_channel_name (int device_id, uint32_t channel) const;
	std::string get_output_channel_name (int device_id, uint32_t channel) const;

	double   sample_rate (void) const { return _cur_sample_rate; }
	uint32_t capture_latency (void) const { return _cur_input_latency; }
	uint32_t playback_latency (void) const { return _cur_output_latency; }
	double   stream_time(void) const { if (_stream) return Pa_GetStreamTime (_stream); return 0; }

	int      next_cycle(uint32_t n_samples);
	int      get_capture_channel (uint32_t chn, float *input, uint32_t n_samples);
	int      set_playback_channel (uint32_t chn, const float *input, uint32_t n_samples);

private: // Methods

	void clear_device_lists ();
	void add_none_devices ();
	void add_default_devices ();
	void add_devices ();
	std::string get_host_api_name_from_index (PaHostApiIndex index);

	bool set_sample_rate_and_latency_from_stream ();
	bool allocate_buffers_for_blocking_api (uint32_t samples_per_period);

	static void get_default_sample_rates(std::vector<float>&);
	static void get_default_buffer_sizes(std::vector<uint32_t>&);

private: // Data
	int  _state;
	bool _initialized;

	uint32_t _capture_channels;
	uint32_t _playback_channels;

	PaStream *_stream;

	float *_input_buffer;
	float *_output_buffer;

	double _cur_sample_rate;
	uint32_t _cur_input_latency;
	uint32_t _cur_output_latency;

	struct paDevice {
		std::string name;
		uint32_t n_inputs;
		uint32_t n_outputs;

		paDevice (std::string n, uint32_t i, uint32_t o)
			: name (n)
			, n_inputs (i)
			, n_outputs (o)
		{}
	};

	std::map<int, paDevice *> _input_devices;
	std::map<int, paDevice *> _output_devices;

	PaHostApiIndex _host_api_index;
	std::string _host_api_name;

};

} // namespace

#endif /* __libbackend_portaudio_pcmio_h__ */