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livetrax/libs/backends/pulseaudio/pulseaudio_backend.h

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/*
* Copyright (C) 2019 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __libbackend_pulse_audiobackend_h__
#define __libbackend_pulse_audiobackend_h__
#include <cstdint>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include <pthread.h>
#include <pulse/pulseaudio.h>
#include "pbd/natsort.h"
#include "ardour/audio_backend.h"
#include "ardour/dsp_load_calculator.h"
#include "ardour/port_engine_shared.h"
#define MaxPulseMidiEventSize (256)
namespace ARDOUR {
class PulseAudioBackend;
class PulseMidiEvent : public BackendMIDIEvent
{
public:
PulseMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
PulseMidiEvent (const PulseMidiEvent& other);
size_t size () const { return _size; };
pframes_t timestamp () const { return _timestamp; };
const uint8_t* data () const { return _data; };
const uint8_t* const_data () const { return _data; };
private:
size_t _size;
pframes_t _timestamp;
uint8_t _data[MaxPulseMidiEventSize];
};
typedef std::vector<std::shared_ptr<PulseMidiEvent> > PulseMidiBuffer;
class PulseAudioPort : public BackendPort
{
public:
PulseAudioPort (PulseAudioBackend& b, const std::string&, PortFlags);
~PulseAudioPort ();
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 PulseAudioPort
class PulseMidiPort : public BackendPort
{
public:
PulseMidiPort (PulseAudioBackend& b, const std::string&, PortFlags);
~PulseMidiPort ();
DataType type () const { return DataType::MIDI; };
void* get_buffer (pframes_t nframes);
const PulseMidiBuffer* const_buffer () const { return &_buffer; }
private:
PulseMidiBuffer _buffer;
}; // class PulseMidiPort
class PulseAudioBackend : public AudioBackend, public PortEngineSharedImpl
{
public:
PulseAudioBackend (AudioEngine& e, AudioBackendInfo& info);
~PulseAudioBackend ();
/* AUDIOBACKEND API */
std::string name () const;
bool is_realtime () const;
std::vector<DeviceStatus> enumerate_devices () const;
std::vector<float> available_sample_rates (const std::string& device) const;
std::vector<uint32_t> available_buffer_sizes (const std::string& device) 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_measure_systemic_latency () const { return false; }
int set_device_name (const std::string&);
int set_sample_rate (float);
int set_buffer_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) { return 0; }
int set_systemic_midi_output_latency (std::string const, uint32_t) { return 0; }
int reset_device () { return 0; };
/* Retrieving parameters */
std::string device_name () const;
float sample_rate () const;
uint32_t buffer_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 { return 0; }
uint32_t systemic_midi_output_latency (std::string const) const { return 0; }
/* External control app */
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std::string control_app_name () const;
void launch_control_app ();
/* MIDI */
std::vector<std::string> enumerate_midi_options () const;
std::vector<DeviceStatus> enumerate_midi_devices () const;
int set_midi_option (const std::string&);
std::string midi_option () const;
int set_midi_device_enabled (std::string const, bool) { return 0; }
bool midi_device_enabled (std::string const) const { return true; }
bool can_set_systemic_midi_latencies () const { return false; }
/* 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;
/* pulse */
struct pa_stream* p_stream;
struct pa_context* p_context;
struct pa_threaded_mainloop* p_mainloop;
int init_pulse ();
void close_pulse (bool unlock = false);
int sync_pulse (pa_operation*);
bool cork_pulse (bool);
static void context_state_cb (pa_context*, void*);
static void stream_state_cb (pa_stream*, void*);
static void stream_request_cb (pa_stream*, size_t, void*);
static void stream_latency_update_cb (pa_stream*, void*);
static void stream_xrun_cb (pa_stream*, void*);
static void stream_operation_cb (pa_stream*, int, void*);
bool _operation_succeeded;
bool _run; /* keep going or stop, ardour thread */
bool _active; /* is running, process thread */
bool _freewheel;
bool _freewheeling;
uint64_t _last_process_start;
/* audio settings */
float _samplerate;
size_t _samples_per_period;
uint32_t _systemic_audio_output_latency;
static const size_t _max_buffer_size;
/* processing */
float _dsp_load;
ARDOUR::DSPLoadCalculator _dsp_load_calc;
samplecnt_t _processed_samples;
pthread_t _main_thread;
/* process threads */
static void* pulse_process_thread (void*);
std::vector<pthread_t> _threads;
struct ThreadData {
PulseAudioBackend* engine;
boost::function<void()> f;
size_t stacksize;
ThreadData (PulseAudioBackend* 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_ports ();
}; // class PulseAudioBackend
} // namespace
#endif /* __libbackend_pulse_audiobackend_h__ */