392 lines
12 KiB
C++
392 lines
12 KiB
C++
/*
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* Copyright (C) 2014 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2013 Paul Davis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __libbackend_alsa_audiobackend_h__
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#define __libbackend_alsa_audiobackend_h__
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#include <string>
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#include <vector>
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#include <map>
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#include <set>
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#include <stdint.h>
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#include <pthread.h>
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#include <boost/shared_ptr.hpp>
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#include "ardour/audio_backend.h"
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#include "ardour/system_exec.h"
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#include "ardour/types.h"
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#include "zita-alsa-pcmi.h"
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#include "alsa_rawmidi.h"
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namespace ARDOUR {
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class AlsaAudioBackend;
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class AlsaMidiEvent {
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public:
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AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
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AlsaMidiEvent (const AlsaMidiEvent& other);
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~AlsaMidiEvent ();
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size_t size () const { return _size; };
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pframes_t timestamp () const { return _timestamp; };
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const unsigned char* const_data () const { return _data; };
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unsigned char* data () { return _data; };
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bool operator< (const AlsaMidiEvent &other) const { return timestamp () < other.timestamp (); };
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private:
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size_t _size;
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pframes_t _timestamp;
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uint8_t *_data;
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};
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typedef std::vector<boost::shared_ptr<AlsaMidiEvent> > AlsaMidiBuffer;
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class AlsaPort {
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protected:
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AlsaPort (AlsaAudioBackend &b, const std::string&, PortFlags);
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public:
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virtual ~AlsaPort ();
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const std::string& name () const { return _name; }
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PortFlags flags () const { return _flags; }
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int set_name (const std::string &name) { _name = name; return 0; }
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virtual DataType type () const = 0;
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bool is_input () const { return flags () & IsInput; }
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bool is_output () const { return flags () & IsOutput; }
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bool is_physical () const { return flags () & IsPhysical; }
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bool is_terminal () const { return flags () & IsTerminal; }
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bool is_connected () const { return _connections.size () != 0; }
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bool is_connected (const AlsaPort *port) const;
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bool is_physically_connected () const;
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const std::vector<AlsaPort *>& get_connections () const { return _connections; }
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int connect (AlsaPort *port);
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int disconnect (AlsaPort *port);
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void disconnect_all ();
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virtual void* get_buffer (pframes_t nframes) = 0;
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const LatencyRange& latency_range (bool for_playback) const
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{
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return for_playback ? _playback_latency_range : _capture_latency_range;
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}
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void set_latency_range (const LatencyRange &latency_range, bool for_playback)
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{
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if (for_playback)
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{
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_playback_latency_range = latency_range;
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}
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else
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{
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_capture_latency_range = latency_range;
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}
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}
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private:
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AlsaAudioBackend &_alsa_backend;
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std::string _name;
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const PortFlags _flags;
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LatencyRange _capture_latency_range;
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LatencyRange _playback_latency_range;
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std::vector<AlsaPort*> _connections;
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void _connect (AlsaPort* , bool);
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void _disconnect (AlsaPort* , bool);
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}; // class AlsaPort
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class AlsaAudioPort : public AlsaPort {
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public:
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AlsaAudioPort (AlsaAudioBackend &b, const std::string&, PortFlags);
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~AlsaAudioPort ();
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DataType type () const { return DataType::AUDIO; };
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Sample* buffer () { return _buffer; }
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const Sample* const_buffer () const { return _buffer; }
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void* get_buffer (pframes_t nframes);
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private:
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Sample _buffer[8192];
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}; // class AlsaAudioPort
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class AlsaMidiPort : public AlsaPort {
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public:
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AlsaMidiPort (AlsaAudioBackend &b, const std::string&, PortFlags);
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~AlsaMidiPort ();
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DataType type () const { return DataType::MIDI; };
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void* get_buffer (pframes_t nframes);
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const AlsaMidiBuffer const_buffer () const { return _buffer[_bufperiod]; }
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void next_period() { get_buffer(0); _bufperiod = (_bufperiod + 1) % 2; }
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private:
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AlsaMidiBuffer _buffer[2];
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int _bufperiod;
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}; // class AlsaMidiPort
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class AlsaAudioBackend : public AudioBackend {
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friend class AlsaPort;
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public:
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AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info);
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~AlsaAudioBackend ();
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/* AUDIOBACKEND API */
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std::string name () const;
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bool is_realtime () const;
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std::vector<DeviceStatus> enumerate_devices () const;
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std::vector<float> available_sample_rates (const std::string& device) const;
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std::vector<uint32_t> available_buffer_sizes (const std::string& device) const;
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uint32_t available_input_channel_count (const std::string& device) const;
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uint32_t available_output_channel_count (const std::string& device) const;
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bool can_change_sample_rate_when_running () const;
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bool can_change_buffer_size_when_running () const;
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int set_device_name (const std::string&);
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int set_sample_rate (float);
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int set_buffer_size (uint32_t);
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int set_interleaved (bool yn);
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int set_input_channels (uint32_t);
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int set_output_channels (uint32_t);
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int set_systemic_input_latency (uint32_t);
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int set_systemic_output_latency (uint32_t);
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/* Retrieving parameters */
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std::string device_name () const;
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float sample_rate () const;
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uint32_t buffer_size () const;
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bool interleaved () const;
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uint32_t input_channels () const;
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uint32_t output_channels () const;
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uint32_t systemic_input_latency () const;
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uint32_t systemic_output_latency () const;
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/* External control app */
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std::string control_app_name () const { return std::string (); }
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void launch_control_app () {}
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/* MIDI */
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std::vector<std::string> enumerate_midi_options () const;
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int set_midi_option (const std::string&);
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std::string midi_option () const;
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/* State Control */
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protected:
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int _start (bool for_latency_measurement);
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public:
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int stop ();
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int freewheel (bool);
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float dsp_load () const;
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size_t raw_buffer_size (DataType t);
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/* Process time */
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pframes_t sample_time ();
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pframes_t sample_time_at_cycle_start ();
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pframes_t samples_since_cycle_start ();
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int create_process_thread (boost::function<void()> func);
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int join_process_threads ();
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bool in_process_thread ();
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uint32_t process_thread_count ();
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void update_latencies ();
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/* PORTENGINE API */
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void* private_handle () const;
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const std::string& my_name () const;
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bool available () const;
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uint32_t port_name_size () const;
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int set_port_name (PortHandle, const std::string&);
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std::string get_port_name (PortHandle) const;
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PortHandle get_port_by_name (const std::string&) const;
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int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>&) const;
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DataType port_data_type (PortHandle) const;
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PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
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void unregister_port (PortHandle);
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int connect (const std::string& src, const std::string& dst);
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int disconnect (const std::string& src, const std::string& dst);
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int connect (PortHandle, const std::string&);
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int disconnect (PortHandle, const std::string&);
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int disconnect_all (PortHandle);
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bool connected (PortHandle, bool process_callback_safe);
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bool connected_to (PortHandle, const std::string&, bool process_callback_safe);
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bool physically_connected (PortHandle, bool process_callback_safe);
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int get_connections (PortHandle, std::vector<std::string>&, bool process_callback_safe);
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/* MIDI */
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int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
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int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
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uint32_t get_midi_event_count (void* port_buffer);
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void midi_clear (void* port_buffer);
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/* Monitoring */
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bool can_monitor_input () const;
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int request_input_monitoring (PortHandle, bool);
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int ensure_input_monitoring (PortHandle, bool);
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bool monitoring_input (PortHandle);
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/* Latency management */
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void set_latency_range (PortHandle, bool for_playback, LatencyRange);
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LatencyRange get_latency_range (PortHandle, bool for_playback);
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/* Discovering physical ports */
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bool port_is_physical (PortHandle) const;
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void get_physical_outputs (DataType type, std::vector<std::string>&);
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void get_physical_inputs (DataType type, std::vector<std::string>&);
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ChanCount n_physical_outputs () const;
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ChanCount n_physical_inputs () const;
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/* Getting access to the data buffer for a port */
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void* get_buffer (PortHandle, pframes_t);
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void* main_process_thread ();
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private:
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std::string _instance_name;
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Alsa_pcmi *_pcmi;
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bool _run; /* keep going or stop, ardour thread */
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bool _active; /* is running, process thread */
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bool _freewheeling;
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void enumerate_midi_devices (std::vector<std::string> &) const;
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std::string _audio_device;
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std::string _midi_device;
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/* audio device reservation */
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ARDOUR::SystemExec *_device_reservation;
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PBD::ScopedConnectionList _reservation_connection;
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void reservation_stdout (std::string, size_t);
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bool acquire_device(const char* device_name);
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void release_device();
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bool _reservation_succeeded;
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float _samplerate;
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size_t _samples_per_period;
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size_t _periods_per_cycle;
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float _dsp_load;
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static size_t _max_buffer_size;
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uint32_t _n_inputs;
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uint32_t _n_outputs;
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uint32_t _systemic_audio_input_latency;
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uint32_t _systemic_audio_output_latency;
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uint32_t _systemic_midi_input_latency;
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uint32_t _systemic_midi_output_latency;
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uint64_t _processed_samples;
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pthread_t _main_thread;
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/* process threads */
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static void* alsa_process_thread (void *);
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std::vector<pthread_t> _threads;
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struct ThreadData {
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AlsaAudioBackend* engine;
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boost::function<void ()> f;
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size_t stacksize;
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ThreadData (AlsaAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
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: engine (e) , f (fp) , stacksize (stacksz) {}
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};
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/* port engine */
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PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
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int register_system_audio_ports ();
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int register_system_midi_ports ();
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void unregister_system_ports ();
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std::vector<AlsaPort *> _ports;
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std::vector<AlsaPort *> _system_inputs;
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std::vector<AlsaPort *> _system_outputs;
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std::vector<AlsaPort *> _system_midi_in;
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std::vector<AlsaPort *> _system_midi_out;
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std::vector<AlsaRawMidiOut *> _rmidi_out;
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std::vector<AlsaRawMidiIn *> _rmidi_in;
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struct PortConnectData {
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std::string a;
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std::string b;
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bool c;
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PortConnectData (const std::string& a, const std::string& b, bool c)
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: a (a) , b (b) , c (c) {}
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};
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std::vector<PortConnectData *> _port_connection_queue;
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pthread_mutex_t _port_callback_mutex;
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bool _port_change_flag;
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void port_connect_callback (const std::string& a, const std::string& b, bool conn) {
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pthread_mutex_lock (&_port_callback_mutex);
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_port_connection_queue.push_back(new PortConnectData(a, b, conn));
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pthread_mutex_unlock (&_port_callback_mutex);
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}
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void port_connect_add_remove_callback () {
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pthread_mutex_lock (&_port_callback_mutex);
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_port_change_flag = true;
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pthread_mutex_unlock (&_port_callback_mutex);
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}
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bool valid_port (PortHandle port) const {
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return std::find (_ports.begin (), _ports.end (), (AlsaPort*)port) != _ports.end ();
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}
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AlsaPort * find_port (const std::string& port_name) const {
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for (std::vector<AlsaPort*>::const_iterator it = _ports.begin (); it != _ports.end (); ++it) {
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if ((*it)->name () == port_name) {
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return *it;
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}
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}
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return NULL;
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}
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}; // class AlsaAudioBackend
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} // namespace
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#endif /* __libbackend_alsa_audiobackend_h__ */
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