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ardour/libs/backends/alsa/alsa_audiobackend.h

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/*
* Copyright (C) 2014 Robin Gareus <robin@gareus.org>
* Copyright (C) 2013 Paul Davis
*
* 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_alsa_audiobackend_h__
#define __libbackend_alsa_audiobackend_h__
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdint.h>
#include <pthread.h>
#include <boost/shared_ptr.hpp>
#include "ardour/audio_backend.h"
#include "ardour/dsp_load_calculator.h"
#include "ardour/system_exec.h"
#include "ardour/types.h"
#include "ardouralsautil/deviceinfo.h"
#include "zita-alsa-pcmi.h"
#include "alsa_rawmidi.h"
#include "alsa_sequencer.h"
namespace ARDOUR {
class AlsaAudioBackend;
class AlsaMidiEvent {
public:
AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
AlsaMidiEvent (const AlsaMidiEvent& other);
~AlsaMidiEvent ();
size_t size () const { return _size; };
pframes_t timestamp () const { return _timestamp; };
const unsigned char* const_data () const { return _data; };
unsigned char* data () { return _data; };
bool operator< (const AlsaMidiEvent &other) const { return timestamp () < other.timestamp (); };
private:
size_t _size;
pframes_t _timestamp;
uint8_t *_data;
};
typedef std::vector<boost::shared_ptr<AlsaMidiEvent> > AlsaMidiBuffer;
class AlsaPort {
protected:
AlsaPort (AlsaAudioBackend &b, const std::string&, PortFlags);
public:
virtual ~AlsaPort ();
const std::string& name () const { return _name; }
const std::string& pretty_name () const { return _pretty_name; }
PortFlags flags () const { return _flags; }
int set_name (const std::string &name) { _name = name; return 0; }
int set_pretty_name (const std::string &name) { _pretty_name = name; return 0; }
virtual DataType type () const = 0;
bool is_input () const { return flags () & IsInput; }
bool is_output () const { return flags () & IsOutput; }
bool is_physical () const { return flags () & IsPhysical; }
bool is_terminal () const { return flags () & IsTerminal; }
bool is_connected () const { return _connections.size () != 0; }
bool is_connected (const AlsaPort *port) const;
bool is_physically_connected () const;
const std::vector<AlsaPort *>& get_connections () const { return _connections; }
int connect (AlsaPort *port);
int disconnect (AlsaPort *port);
void disconnect_all ();
virtual void* get_buffer (pframes_t nframes) = 0;
const LatencyRange latency_range (bool for_playback) const
{
return for_playback ? _playback_latency_range : _capture_latency_range;
}
void set_latency_range (const LatencyRange &latency_range, bool for_playback)
{
if (for_playback)
{
_playback_latency_range = latency_range;
}
else
{
_capture_latency_range = latency_range;
}
}
private:
AlsaAudioBackend &_alsa_backend;
std::string _name;
std::string _pretty_name;
const PortFlags _flags;
LatencyRange _capture_latency_range;
LatencyRange _playback_latency_range;
std::vector<AlsaPort*> _connections;
void _connect (AlsaPort* , bool);
void _disconnect (AlsaPort* , bool);
}; // class AlsaPort
class AlsaAudioPort : public AlsaPort {
public:
AlsaAudioPort (AlsaAudioBackend &b, const std::string&, PortFlags);
~AlsaAudioPort ();
DataType type () const { return DataType::AUDIO; };
Sample* buffer () { return _buffer; }
const Sample* const_buffer () const { return _buffer; }
void* get_buffer (pframes_t nframes);
private:
Sample _buffer[8192];
}; // class AlsaAudioPort
class AlsaMidiPort : public AlsaPort {
public:
AlsaMidiPort (AlsaAudioBackend &b, const std::string&, PortFlags);
~AlsaMidiPort ();
DataType type () const { return DataType::MIDI; };
void* get_buffer (pframes_t nframes);
const AlsaMidiBuffer * const_buffer () const { return & _buffer[_bufperiod]; }
void next_period() { if (_n_periods > 1) { get_buffer(0); _bufperiod = (_bufperiod + 1) % _n_periods; } }
void set_n_periods(int n) { if (n > 0 && n < 4) { _n_periods = n; } }
private:
AlsaMidiBuffer _buffer[3];
int _n_periods;
int _bufperiod;
}; // class AlsaMidiPort
class AlsaAudioBackend : public AudioBackend {
friend class AlsaPort;
public:
AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info);
~AlsaAudioBackend ();
/* AUDIOBACKEND API */
std::string name () const;
bool is_realtime () const;
bool use_separate_input_and_output_devices () const { return true; }
bool can_set_period_size () const { return true; }
std::vector<DeviceStatus> enumerate_devices () const;
std::vector<DeviceStatus> enumerate_input_devices () const;
std::vector<DeviceStatus> enumerate_output_devices () const;
std::vector<float> available_sample_rates (const std::string& device) const;
std::vector<float> available_sample_rates2 (const std::string&, const std::string&) const;
std::vector<uint32_t> available_buffer_sizes (const std::string& device) const;
std::vector<uint32_t> available_buffer_sizes2 (const std::string&, const std::string&) const;
std::vector<uint32_t> available_period_sizes (const std::string& driver) const;
uint32_t available_input_channel_count (const std::string& device) const;
uint32_t available_output_channel_count (const std::string& device) const;
bool can_change_sample_rate_when_running () const;
bool can_change_buffer_size_when_running () const;
bool can_change_systemic_latency_when_running () const { return true; }
int set_device_name (const std::string&);
int set_input_device_name (const std::string&);
int set_output_device_name (const std::string&);
int set_sample_rate (float);
int set_buffer_size (uint32_t);
int set_peridod_size (uint32_t);
int set_interleaved (bool yn);
int set_input_channels (uint32_t);
int set_output_channels (uint32_t);
int set_systemic_input_latency (uint32_t);
int set_systemic_output_latency (uint32_t);
int set_systemic_midi_input_latency (std::string const, uint32_t);
int set_systemic_midi_output_latency (std::string const, uint32_t);
int reset_device () { return 0; };
/* Retrieving parameters */
std::string device_name () const;
std::string input_device_name () const;
std::string output_device_name () const;
float sample_rate () const;
uint32_t buffer_size () const;
uint32_t period_size () const;
bool interleaved () const;
uint32_t input_channels () const;
uint32_t output_channels () const;
uint32_t systemic_input_latency () const;
uint32_t systemic_output_latency () const;
uint32_t systemic_midi_input_latency (std::string const) const;
uint32_t systemic_midi_output_latency (std::string const) const;
bool can_set_systemic_midi_latencies () const { return true; }
/* External control app */
std::string control_app_name () const { return std::string (); }
void launch_control_app () {}
/* MIDI */
std::vector<std::string> enumerate_midi_options () const;
int set_midi_option (const std::string&);
std::string midi_option () const;
std::vector<DeviceStatus> enumerate_midi_devices () const;
int set_midi_device_enabled (std::string const, bool);
bool midi_device_enabled (std::string const) const;
/* State Control */
protected:
int _start (bool for_latency_measurement);
public:
int stop ();
int freewheel (bool);
float dsp_load () const;
size_t raw_buffer_size (DataType t);
/* Process time */
framepos_t sample_time ();
framepos_t sample_time_at_cycle_start ();
pframes_t samples_since_cycle_start ();
int create_process_thread (boost::function<void()> func);
int join_process_threads ();
bool in_process_thread ();
uint32_t process_thread_count ();
void update_latencies ();
/* PORTENGINE API */
void* private_handle () const;
const std::string& my_name () const;
bool available () const;
uint32_t port_name_size () const;
int set_port_name (PortHandle, const std::string&);
std::string get_port_name (PortHandle) const;
PortHandle get_port_by_name (const std::string&) const;
int get_port_property (PortHandle, const std::string& key, std::string& value, std::string& type) const;
int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>&) const;
DataType port_data_type (PortHandle) const;
PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
void unregister_port (PortHandle);
int connect (const std::string& src, const std::string& dst);
int disconnect (const std::string& src, const std::string& dst);
int connect (PortHandle, const std::string&);
int disconnect (PortHandle, const std::string&);
int disconnect_all (PortHandle);
bool connected (PortHandle, bool process_callback_safe);
bool connected_to (PortHandle, const std::string&, bool process_callback_safe);
bool physically_connected (PortHandle, bool process_callback_safe);
int get_connections (PortHandle, std::vector<std::string>&, bool process_callback_safe);
/* MIDI */
int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
uint32_t get_midi_event_count (void* port_buffer);
void midi_clear (void* port_buffer);
/* Monitoring */
bool can_monitor_input () const;
int request_input_monitoring (PortHandle, bool);
int ensure_input_monitoring (PortHandle, bool);
bool monitoring_input (PortHandle);
/* Latency management */
void set_latency_range (PortHandle, bool for_playback, LatencyRange);
LatencyRange get_latency_range (PortHandle, bool for_playback);
/* Discovering physical ports */
bool port_is_physical (PortHandle) const;
void get_physical_outputs (DataType type, std::vector<std::string>&);
void get_physical_inputs (DataType type, std::vector<std::string>&);
ChanCount n_physical_outputs () const;
ChanCount n_physical_inputs () const;
/* Getting access to the data buffer for a port */
void* get_buffer (PortHandle, pframes_t);
void* main_process_thread ();
private:
std::string _instance_name;
Alsa_pcmi *_pcmi;
bool _run; /* keep going or stop, ardour thread */
bool _active; /* is running, process thread */
bool _freewheel;
bool _freewheeling;
bool _measure_latency;
uint64_t _last_process_start;
static std::vector<std::string> _midi_options;
static std::vector<AudioBackend::DeviceStatus> _input_audio_device_status;
static std::vector<AudioBackend::DeviceStatus> _output_audio_device_status;
static std::vector<AudioBackend::DeviceStatus> _duplex_audio_device_status;
static std::vector<AudioBackend::DeviceStatus> _midi_device_status;
static ARDOUR::ALSADeviceInfo _input_audio_device_info;
static ARDOUR::ALSADeviceInfo _output_audio_device_info;
mutable std::string _input_audio_device;
mutable std::string _output_audio_device;
std::string _midi_driver_option;
/* audio device reservation */
ARDOUR::SystemExec *_device_reservation;
PBD::ScopedConnectionList _reservation_connection;
void reservation_stdout (std::string, size_t);
bool acquire_device(const char* device_name);
void release_device();
bool _reservation_succeeded;
/* audio settings */
float _samplerate;
size_t _samples_per_period;
size_t _periods_per_cycle;
static size_t _max_buffer_size;
uint32_t _n_inputs;
uint32_t _n_outputs;
uint32_t _systemic_audio_input_latency;
uint32_t _systemic_audio_output_latency;
/* midi settings */
struct AlsaMidiDeviceInfo {
bool enabled;
uint32_t systemic_input_latency;
uint32_t systemic_output_latency;
AlsaMidiDeviceInfo()
: enabled (true)
, systemic_input_latency (0)
, systemic_output_latency (0)
{}
};
mutable std::map<std::string, struct AlsaMidiDeviceInfo *> _midi_devices;
struct AlsaMidiDeviceInfo * midi_device_info(std::string const) const;
/* processing */
float _dsp_load;
ARDOUR::DSPLoadCalculator _dsp_load_calc;
framecnt_t _processed_samples;
pthread_t _main_thread;
/* process threads */
static void* alsa_process_thread (void *);
std::vector<pthread_t> _threads;
struct ThreadData {
AlsaAudioBackend* engine;
boost::function<void ()> f;
size_t stacksize;
ThreadData (AlsaAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
: engine (e) , f (fp) , stacksize (stacksz) {}
};
/* port engine */
PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
int register_system_audio_ports ();
int register_system_midi_ports (const std::string device = "");
void unregister_ports (bool system_only = false);
std::vector<AlsaPort *> _ports;
std::vector<AlsaPort *> _system_inputs;
std::vector<AlsaPort *> _system_outputs;
std::vector<AlsaPort *> _system_midi_in;
std::vector<AlsaPort *> _system_midi_out;
std::vector<AlsaMidiOut *> _rmidi_out;
std::vector<AlsaMidiIn *> _rmidi_in;
unsigned _midi_ins;
unsigned _midi_outs;
struct PortConnectData {
std::string a;
std::string b;
bool c;
PortConnectData (const std::string& a, const std::string& b, bool c)
: a (a) , b (b) , c (c) {}
};
std::vector<PortConnectData *> _port_connection_queue;
pthread_mutex_t _port_callback_mutex;
bool _port_change_flag;
void port_connect_callback (const std::string& a, const std::string& b, bool conn) {
pthread_mutex_lock (&_port_callback_mutex);
_port_connection_queue.push_back(new PortConnectData(a, b, conn));
pthread_mutex_unlock (&_port_callback_mutex);
}
void port_connect_add_remove_callback () {
pthread_mutex_lock (&_port_callback_mutex);
_port_change_flag = true;
pthread_mutex_unlock (&_port_callback_mutex);
}
bool valid_port (PortHandle port) const {
return std::find (_ports.begin (), _ports.end (), (AlsaPort*)port) != _ports.end ();
}
AlsaPort * find_port (const std::string& port_name) const {
for (std::vector<AlsaPort*>::const_iterator it = _ports.begin (); it != _ports.end (); ++it) {
if ((*it)->name () == port_name) {
return *it;
}
}
return NULL;
}
void update_systemic_audio_latencies ();
void update_systemic_midi_latencies ();
}; // class AlsaAudioBackend
} // namespace
#endif /* __libbackend_alsa_audiobackend_h__ */
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