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livetrax/libs/backends/alsa/alsa_audiobackend.h
Paul Davis b9cb306e8b use shared_ptr to manage backend port lifetimes (Pulse,ALSA,Dummy,JACK) 
JACK is not yet finished.

Changes also include minor reformatting and a spelling correction (latecies to latencies)
2020-04-07 13:23:49 -06:00

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/*
* Copyright (C) 2014-2019 Robin Gareus <robin@gareus.org>
* Copyright (C) 2015-2018 Paul Davis <paul@linuxaudiosystems.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 "pbd/natsort.h"
#include "pbd/rcu.h"
#include "ardour/audio_backend.h"
#include "ardour/dsp_load_calculator.h"
#include "ardour/port_engine_shared.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"
#include "alsa_slave.h"
namespace ARDOUR {
class AlsaAudioBackend;
class AlsaMidiEvent {
public:
AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
AlsaMidiEvent (const AlsaMidiEvent& other);
size_t size () const { return _size; };
pframes_t timestamp () const { return _timestamp; };
const uint8_t* data () const { return _data; };
bool operator< (const AlsaMidiEvent &other) const { return timestamp () < other.timestamp (); };
private:
size_t _size;
pframes_t _timestamp;
uint8_t _data[MaxAlsaMidiEventSize];
};
typedef std::vector<AlsaMidiEvent> AlsaMidiBuffer;
class AlsaAudioPort : public BackendPort {
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 BackendPort {
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 AlsaDeviceReservation
{
public:
AlsaDeviceReservation ();
AlsaDeviceReservation (const char* device_name);
~AlsaDeviceReservation ();
bool acquire_device (const char* device_name);
void release_device ();
private:
ARDOUR::SystemExec* _device_reservation;
PBD::ScopedConnectionList _reservation_connection;
void reservation_stdout (std::string, size_t);
bool _reservation_succeeded;
};
class AlsaAudioBackend : public AudioBackend, public PortEngineSharedImpl
{
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 match_input_output_devices_or_none () 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 */
samplepos_t sample_time ();
samplepos_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;
/* PortEngine API - forwarded to PortEngineSharedImpl */
bool port_is_physical (PortEngine::PortHandle ph) const { return PortEngineSharedImpl::port_is_physical (ph); }
void get_physical_outputs (DataType type, std::vector<std::string>& results) { PortEngineSharedImpl::get_physical_outputs (type, results); }
void get_physical_inputs (DataType type, std::vector<std::string>& results) { PortEngineSharedImpl::get_physical_inputs (type, results); }
ChanCount n_physical_outputs () const { return PortEngineSharedImpl::n_physical_outputs (); }
ChanCount n_physical_inputs () const { return PortEngineSharedImpl::n_physical_inputs (); }
uint32_t port_name_size () const { return PortEngineSharedImpl::port_name_size(); }
int set_port_name (PortEngine::PortHandle ph, const std::string& name) { return PortEngineSharedImpl::set_port_name (ph, name); }
std::string get_port_name (PortEngine::PortHandle ph) const { return PortEngineSharedImpl::get_port_name (ph); }
PortFlags get_port_flags (PortEngine::PortHandle ph) const { return PortEngineSharedImpl::get_port_flags (ph); }
PortEngine::PortPtr get_port_by_name (std::string const & name) const { return PortEngineSharedImpl::get_port_by_name (name); }
int get_port_property (PortEngine::PortHandle ph, const std::string& key, std::string& value, std::string& type) const { return PortEngineSharedImpl::get_port_property (ph, key, value, type); }
int set_port_property (PortEngine::PortHandle ph, const std::string& key, const std::string& value, const std::string& type) { return PortEngineSharedImpl::set_port_property (ph, key, value, type); }
int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>& results) const { return PortEngineSharedImpl::get_ports (port_name_pattern, type, flags, results); }
DataType port_data_type (PortEngine::PortHandle ph) const { return PortEngineSharedImpl::port_data_type (ph); }
PortEngine::PortPtr register_port (const std::string& shortname, ARDOUR::DataType type, ARDOUR::PortFlags flags) { return PortEngineSharedImpl::register_port (shortname, type, flags); }
void unregister_port (PortHandle ph) { if (!_run) return; PortEngineSharedImpl::unregister_port (ph); }
int connect (const std::string& src, const std::string& dst) { return PortEngineSharedImpl::connect (src, dst); }
int disconnect (const std::string& src, const std::string& dst) { return PortEngineSharedImpl::disconnect (src, dst); }
int connect (PortEngine::PortHandle ph, const std::string& other) { return PortEngineSharedImpl::connect (ph, other); }
int disconnect (PortEngine::PortHandle ph, const std::string& other) { return PortEngineSharedImpl::disconnect (ph, other); }
int disconnect_all (PortEngine::PortHandle ph) { return PortEngineSharedImpl::disconnect_all (ph); }
bool connected (PortEngine::PortHandle ph, bool process_callback_safe) { return PortEngineSharedImpl::connected (ph, process_callback_safe); }
bool connected_to (PortEngine::PortHandle ph, const std::string& other, bool process_callback_safe) { return PortEngineSharedImpl::connected_to (ph, other, process_callback_safe); }
bool physically_connected (PortEngine::PortHandle ph, bool process_callback_safe) { return PortEngineSharedImpl::physically_connected (ph, process_callback_safe); }
int get_connections (PortEngine::PortHandle ph, std::vector<std::string>& results, bool process_callback_safe) { return PortEngineSharedImpl::get_connections (ph, results, process_callback_safe); }
/* MIDI */
int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t const** 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);
/* 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 */
AlsaDeviceReservation _device_reservation;
/* 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 (bool en = true)
: enabled (en)
, 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;
/* midi device changes */
void auto_update_midi_devices();
bool listen_for_midi_device_changes ();
void stop_listen_for_midi_device_changes ();
void midi_device_thread ();
static void* _midi_device_thread (void *arg);
pthread_t _midi_device_thread_id;
bool _midi_device_thread_active;
pthread_mutex_t _device_port_mutex;
/* processing */
float _dsp_load;
ARDOUR::DSPLoadCalculator _dsp_load_calc;
samplecnt_t _processed_samples;
pthread_t _main_thread;
/* DLL, track main process callback timing */
double _t0, _t1;
/* 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 */
BackendPort* port_factory (std::string const & name, ARDOUR::DataType dt, ARDOUR::PortFlags flags);
int register_system_audio_ports ();
int register_system_midi_ports (const std::string device = "");
void update_system_port_latencies ();
std::vector<AlsaMidiOut *> _rmidi_out;
std::vector<AlsaMidiIn *> _rmidi_in;
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);
}
void update_systemic_audio_latencies ();
void update_systemic_midi_latencies ();
/* additional re-sampled I/O */
bool add_slave (const char* slave_device,
unsigned int slave_rate,
unsigned int slave_spp,
unsigned int duplex = 3);
class AudioSlave : public AlsaDeviceReservation, public AlsaAudioSlave {
public:
AudioSlave (
const char* device,
unsigned int duplex,
unsigned int master_rate,
unsigned int master_samples_per_period,
unsigned int slave_rate,
unsigned int slave_samples_per_period,
unsigned int periods_per_cycle);
~AudioSlave ();
bool active; // set in sync with process-cb
bool halt;
bool dead;
std::vector<BackendPortPtr> inputs;
std::vector<BackendPortPtr> outputs;
PBD::Signal0<void> UpdateLatency;
PBD::ScopedConnection latency_connection;
protected:
void update_latencies (uint32_t, uint32_t);
private:
PBD::ScopedConnection _halted_connection;
void halted ();
};
typedef std::vector<AudioSlave*> AudioSlaves;
AudioSlaves _slaves;
}; // class AlsaAudioBackend
} // namespace
#endif /* __libbackend_alsa_audiobackend_h__ */
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