/
audioengine.cc
1524 lines (1222 loc) · 32.2 KB
/
audioengine.cc
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/*
Copyright (C) 2002 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.
*/
#include <unistd.h>
#include <cerrno>
#include <vector>
#include <exception>
#include <stdexcept>
#include <sstream>
#include <cmath>
#include <glibmm/timer.h>
#include <glibmm/pattern.h>
#include <glibmm/module.h>
#include "pbd/epa.h"
#include "pbd/file_utils.h"
#include "pbd/pthread_utils.h"
#include "pbd/stacktrace.h"
#include "pbd/unknown_type.h"
#include "midi++/port.h"
#include "midi++/mmc.h"
#include "ardour/async_midi_port.h"
#include "ardour/audio_port.h"
#include "ardour/audio_backend.h"
#include "ardour/audioengine.h"
#include "ardour/search_paths.h"
#include "ardour/buffer.h"
#include "ardour/cycle_timer.h"
#include "ardour/internal_send.h"
#include "ardour/meter.h"
#include "ardour/midi_port.h"
#include "ardour/midiport_manager.h"
#include "ardour/mididm.h"
#include "ardour/mtdm.h"
#include "ardour/port.h"
#include "ardour/process_thread.h"
#include "ardour/rc_configuration.h"
#include "ardour/session.h"
#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
AudioEngine* AudioEngine::_instance = 0;
static gint audioengine_thread_cnt = 1;
#ifdef SILENCE_AFTER
#define SILENCE_AFTER_SECONDS 600
#endif
AudioEngine::AudioEngine ()
: session_remove_pending (false)
, session_removal_countdown (-1)
, _running (false)
, _freewheeling (false)
, monitor_check_interval (INT32_MAX)
, last_monitor_check (0)
, _processed_samples (0)
, m_meter_thread (0)
, _main_thread (0)
, _mtdm (0)
, _mididm (0)
, _measuring_latency (MeasureNone)
, _latency_input_port (0)
, _latency_output_port (0)
, _latency_flush_samples (0)
, _latency_signal_latency (0)
, _stopped_for_latency (false)
, _started_for_latency (false)
, _in_destructor (false)
, _last_backend_error_string(AudioBackend::get_error_string((AudioBackend::ErrorCode)-1))
, _hw_reset_event_thread(0)
, _hw_reset_request_count(0)
, _stop_hw_reset_processing(0)
, _hw_devicelist_update_thread(0)
, _hw_devicelist_update_count(0)
, _stop_hw_devicelist_processing(0)
#ifdef SILENCE_AFTER_SECONDS
, _silence_countdown (0)
, _silence_hit_cnt (0)
#endif
{
reset_silence_countdown ();
start_hw_event_processing();
discover_backends ();
}
AudioEngine::~AudioEngine ()
{
_in_destructor = true;
stop_hw_event_processing();
drop_backend ();
for (BackendMap::const_iterator i = _backends.begin(); i != _backends.end(); ++i) {
i->second->deinstantiate();
}
delete _main_thread;
}
AudioEngine*
AudioEngine::create ()
{
if (_instance) {
return _instance;
}
_instance = new AudioEngine ();
return _instance;
}
void
AudioEngine::split_cycle (pframes_t offset)
{
/* caller must hold process lock */
Port::increment_global_port_buffer_offset (offset);
/* tell all Ports that we're going to start a new (split) cycle */
boost::shared_ptr<Ports> p = ports.reader();
for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
i->second->cycle_split ();
}
}
int
AudioEngine::sample_rate_change (pframes_t nframes)
{
/* check for monitor input change every 1/10th of second */
monitor_check_interval = nframes / 10;
last_monitor_check = 0;
if (_session) {
_session->set_sample_rate (nframes);
}
SampleRateChanged (nframes); /* EMIT SIGNAL */
#ifdef SILENCE_AFTER_SECONDS
_silence_countdown = nframes * SILENCE_AFTER_SECONDS;
#endif
return 0;
}
int
AudioEngine::buffer_size_change (pframes_t bufsiz)
{
if (_session) {
_session->set_block_size (bufsiz);
last_monitor_check = 0;
}
BufferSizeChanged (bufsiz); /* EMIT SIGNAL */
return 0;
}
/** Method called by our ::process_thread when there is work to be done.
* @param nframes Number of samples to process.
*/
#ifdef __clang__
__attribute__((annotate("realtime")))
#endif
int
AudioEngine::process_callback (pframes_t nframes)
{
Glib::Threads::Mutex::Lock tm (_process_lock, Glib::Threads::TRY_LOCK);
PT_TIMING_REF;
PT_TIMING_CHECK (1);
/// The number of samples that will have been processed when we've finished
pframes_t next_processed_samples;
/* handle wrap around of total samples counter */
if (max_samplepos - _processed_samples < nframes) {
next_processed_samples = nframes - (max_samplepos - _processed_samples);
} else {
next_processed_samples = _processed_samples + nframes;
}
if (!tm.locked()) {
/* return having done nothing */
if (_session) {
Xrun();
}
/* really only JACK requires this
* (other backends clear the output buffers
* before the process_callback. it may even be
* jack/alsa only). but better safe than sorry.
*/
PortManager::silence_outputs (nframes);
return 0;
}
/* The coreaudio-backend calls thread_init_callback() if
* the hardware changes or pthread_self() changes.
*
* However there are cases when neither holds true, yet
* the thread-pool changes: e.g. connect a headphone to
* a shared mic/headphone jack.
* It's probably related to, or caused by clocksource changes.
*
* For reasons yet unknown Glib::Threads::Private() can
* use a different thread-private in the same pthread
* (coreaudio render callback).
*
* Coreaudio must set something which influences
* pthread_key_t uniqness or reset the key using
* pthread_getspecific().
*/
if (! SessionEvent::has_per_thread_pool ()) {
thread_init_callback (NULL);
}
bool return_after_remove_check = false;
if (_measuring_latency == MeasureAudio && _mtdm) {
/* run a normal cycle from the perspective of the PortManager
so that we get silence on all registered ports.
we overwrite the silence on the two ports used for latency
measurement.
*/
PortManager::cycle_start (nframes);
PortManager::silence (nframes);
if (_latency_input_port && _latency_output_port) {
PortEngine& pe (port_engine());
Sample* in = (Sample*) pe.get_buffer (_latency_input_port, nframes);
Sample* out = (Sample*) pe.get_buffer (_latency_output_port, nframes);
_mtdm->process (nframes, in, out);
}
PortManager::cycle_end (nframes);
return_after_remove_check = true;
} else if (_measuring_latency == MeasureMIDI && _mididm) {
/* run a normal cycle from the perspective of the PortManager
so that we get silence on all registered ports.
we overwrite the silence on the two ports used for latency
measurement.
*/
PortManager::cycle_start (nframes);
PortManager::silence (nframes);
if (_latency_input_port && _latency_output_port) {
PortEngine& pe (port_engine());
_mididm->process (nframes, pe,
pe.get_buffer (_latency_input_port, nframes),
pe.get_buffer (_latency_output_port, nframes));
}
PortManager::cycle_end (nframes);
return_after_remove_check = true;
} else if (_latency_flush_samples) {
/* wait for the appropriate duration for the MTDM signal to
* drain from the ports before we revert to normal behaviour.
*/
PortManager::cycle_start (nframes);
PortManager::silence (nframes);
PortManager::cycle_end (nframes);
if (_latency_flush_samples > nframes) {
_latency_flush_samples -= nframes;
} else {
_latency_flush_samples = 0;
}
return_after_remove_check = true;
}
if (session_remove_pending) {
/* perform the actual session removal */
if (session_removal_countdown < 0) {
/* fade out over 1 second */
session_removal_countdown = sample_rate()/2;
session_removal_gain = GAIN_COEFF_UNITY;
session_removal_gain_step = 1.0/session_removal_countdown;
} else if (session_removal_countdown > 0) {
/* we'll be fading audio out.
if this is the last time we do this as part
of session removal, do a MIDI panic now
to get MIDI stopped. This relies on the fact
that "immediate data" (aka "out of band data") from
MIDI tracks is *appended* after any other data,
so that it emerges after any outbound note ons, etc.
*/
if (session_removal_countdown <= nframes) {
_session->midi_panic ();
}
} else {
/* fade out done */
_session = 0;
session_removal_countdown = -1; // reset to "not in progress"
session_remove_pending = false;
session_removed.signal(); // wakes up thread that initiated session removal
}
}
if (return_after_remove_check) {
return 0;
}
if (_session == 0) {
if (!_freewheeling) {
PortManager::cycle_start (nframes);
PortManager::cycle_end (nframes);
}
_processed_samples = next_processed_samples;
return 0;
}
/* tell all relevant objects that we're starting a new cycle */
InternalSend::CycleStart (nframes);
/* tell all Ports that we're starting a new cycle */
PortManager::cycle_start (nframes);
/* test if we are freewheeling and there are freewheel signals connected.
* ardour should act normally even when freewheeling unless /it/ is
* exporting (which is what Freewheel.empty() tests for).
*/
if (_freewheeling && !Freewheel.empty()) {
Freewheel (nframes);
} else {
_session->process (nframes);
}
if (_freewheeling) {
PortManager::cycle_end (nframes);
return 0;
}
if (!_running) {
_processed_samples = next_processed_samples;
return 0;
}
if (last_monitor_check + monitor_check_interval < next_processed_samples) {
PortManager::check_monitoring ();
last_monitor_check = next_processed_samples;
}
#ifdef SILENCE_AFTER_SECONDS
bool was_silent = (_silence_countdown == 0);
if (_silence_countdown >= nframes) {
_silence_countdown -= nframes;
} else {
_silence_countdown = 0;
}
if (!was_silent && _silence_countdown == 0) {
_silence_hit_cnt++;
BecameSilent (); /* EMIT SIGNAL */
}
if (_silence_countdown == 0 || _session->silent()) {
PortManager::silence (nframes);
}
#else
if (_session->silent()) {
PortManager::silence (nframes, _session);
}
#endif
if (session_remove_pending && session_removal_countdown) {
PortManager::fade_out (session_removal_gain, session_removal_gain_step, nframes);
if (session_removal_countdown > nframes) {
session_removal_countdown -= nframes;
} else {
session_removal_countdown = 0;
}
session_removal_gain -= (nframes * session_removal_gain_step);
}
PortManager::cycle_end (nframes);
_processed_samples = next_processed_samples;
PT_TIMING_CHECK (2);
return 0;
}
void
AudioEngine::reset_silence_countdown ()
{
#ifdef SILENCE_AFTER_SECONDS
double sr = 48000; /* default in case there is no backend */
sr = sample_rate();
_silence_countdown = max (60 * sr, /* 60 seconds */
sr * (SILENCE_AFTER_SECONDS / ::pow (2.0, (double) _silence_hit_cnt)));
#endif
}
void
AudioEngine::launch_device_control_app()
{
if (_state_lock.trylock () ) {
_backend->launch_control_app ();
_state_lock.unlock ();
}
}
void
AudioEngine::request_backend_reset()
{
Glib::Threads::Mutex::Lock guard (_reset_request_lock);
g_atomic_int_inc (&_hw_reset_request_count);
_hw_reset_condition.signal ();
}
int
AudioEngine::backend_reset_requested()
{
return g_atomic_int_get (&_hw_reset_request_count);
}
void
AudioEngine::do_reset_backend()
{
SessionEvent::create_per_thread_pool (X_("Backend reset processing thread"), 1024);
Glib::Threads::Mutex::Lock guard (_reset_request_lock);
while (!_stop_hw_reset_processing) {
if (g_atomic_int_get (&_hw_reset_request_count) != 0 && _backend) {
_reset_request_lock.unlock();
Glib::Threads::RecMutex::Lock pl (_state_lock);
g_atomic_int_dec_and_test (&_hw_reset_request_count);
std::cout << "AudioEngine::RESET::Reset request processing. Requests left: " << _hw_reset_request_count << std::endl;
DeviceResetStarted(); // notify about device reset to be started
// backup the device name
std::string name = _backend->device_name ();
std::cout << "AudioEngine::RESET::Reseting device..." << std::endl;
if ( ( 0 == stop () ) &&
( 0 == _backend->reset_device () ) &&
( 0 == start () ) ) {
std::cout << "AudioEngine::RESET::Engine started..." << std::endl;
// inform about possible changes
BufferSizeChanged (_backend->buffer_size() );
DeviceResetFinished(); // notify about device reset finish
} else {
DeviceResetFinished(); // notify about device reset finish
// we've got an error
DeviceError();
}
std::cout << "AudioEngine::RESET::Done." << std::endl;
_reset_request_lock.lock();
} else {
_hw_reset_condition.wait (_reset_request_lock);
}
}
}
void
AudioEngine::request_device_list_update()
{
Glib::Threads::Mutex::Lock guard (_devicelist_update_lock);
g_atomic_int_inc (&_hw_devicelist_update_count);
_hw_devicelist_update_condition.signal ();
}
void
AudioEngine::do_devicelist_update()
{
SessionEvent::create_per_thread_pool (X_("Device list update processing thread"), 512);
Glib::Threads::Mutex::Lock guard (_devicelist_update_lock);
while (!_stop_hw_devicelist_processing) {
if (_hw_devicelist_update_count) {
_devicelist_update_lock.unlock();
Glib::Threads::RecMutex::Lock pl (_state_lock);
g_atomic_int_dec_and_test (&_hw_devicelist_update_count);
DeviceListChanged (); /* EMIT SIGNAL */
_devicelist_update_lock.lock();
} else {
_hw_devicelist_update_condition.wait (_devicelist_update_lock);
}
}
}
void
AudioEngine::start_hw_event_processing()
{
if (_hw_reset_event_thread == 0) {
g_atomic_int_set(&_hw_reset_request_count, 0);
g_atomic_int_set(&_stop_hw_reset_processing, 0);
_hw_reset_event_thread = Glib::Threads::Thread::create (boost::bind (&AudioEngine::do_reset_backend, this));
}
if (_hw_devicelist_update_thread == 0) {
g_atomic_int_set(&_hw_devicelist_update_count, 0);
g_atomic_int_set(&_stop_hw_devicelist_processing, 0);
_hw_devicelist_update_thread = Glib::Threads::Thread::create (boost::bind (&AudioEngine::do_devicelist_update, this));
}
}
void
AudioEngine::stop_hw_event_processing()
{
if (_hw_reset_event_thread) {
g_atomic_int_set(&_stop_hw_reset_processing, 1);
g_atomic_int_set(&_hw_reset_request_count, 0);
_hw_reset_condition.signal ();
_hw_reset_event_thread->join ();
_hw_reset_event_thread = 0;
}
if (_hw_devicelist_update_thread) {
g_atomic_int_set(&_stop_hw_devicelist_processing, 1);
g_atomic_int_set(&_hw_devicelist_update_count, 0);
_hw_devicelist_update_condition.signal ();
_hw_devicelist_update_thread->join ();
_hw_devicelist_update_thread = 0;
}
}
void
AudioEngine::set_session (Session *s)
{
Glib::Threads::Mutex::Lock pl (_process_lock);
SessionHandlePtr::set_session (s);
if (_session) {
pframes_t blocksize = samples_per_cycle ();
PortManager::cycle_start (blocksize);
_session->process (blocksize);
_session->process (blocksize);
_session->process (blocksize);
_session->process (blocksize);
_session->process (blocksize);
_session->process (blocksize);
_session->process (blocksize);
_session->process (blocksize);
PortManager::cycle_end (blocksize);
}
}
void
AudioEngine::remove_session ()
{
Glib::Threads::Mutex::Lock lm (_process_lock);
if (_running) {
if (_session) {
session_remove_pending = true;
/* signal the start of the fade out countdown */
session_removal_countdown = -1;
session_removed.wait(_process_lock);
}
} else {
SessionHandlePtr::set_session (0);
}
remove_all_ports ();
}
void
AudioEngine::reconnect_session_routes (bool reconnect_inputs, bool reconnect_outputs)
{
#ifdef USE_TRACKS_CODE_FEATURES
if (_session) {
_session->reconnect_existing_routes(true, true, reconnect_inputs, reconnect_outputs);
}
#endif
}
void
AudioEngine::died ()
{
/* called from a signal handler for SIGPIPE */
_running = false;
}
int
AudioEngine::reset_timebase ()
{
if (_session) {
if (_session->config.get_jack_time_master()) {
_backend->set_time_master (true);
} else {
_backend->set_time_master (false);
}
}
return 0;
}
void
AudioEngine::destroy ()
{
delete _instance;
_instance = 0;
}
int
AudioEngine::discover_backends ()
{
vector<std::string> backend_modules;
_backends.clear ();
Glib::PatternSpec so_extension_pattern("*backend.so");
Glib::PatternSpec dylib_extension_pattern("*backend.dylib");
#if defined(PLATFORM_WINDOWS) && defined(DEBUGGABLE_BACKENDS)
#if defined(DEBUG) || defined(_DEBUG)
Glib::PatternSpec dll_extension_pattern("*backendD.dll");
#else
Glib::PatternSpec dll_extension_pattern("*backendRDC.dll");
#endif
#else
Glib::PatternSpec dll_extension_pattern("*backend.dll");
#endif
find_files_matching_pattern (backend_modules, backend_search_path (),
so_extension_pattern);
find_files_matching_pattern (backend_modules, backend_search_path (),
dylib_extension_pattern);
find_files_matching_pattern (backend_modules, backend_search_path (),
dll_extension_pattern);
DEBUG_TRACE (DEBUG::AudioEngine, string_compose ("looking for backends in %1\n", backend_search_path().to_string()));
for (vector<std::string>::iterator i = backend_modules.begin(); i != backend_modules.end(); ++i) {
AudioBackendInfo* info;
DEBUG_TRACE (DEBUG::AudioEngine, string_compose ("Checking possible backend in %1\n", *i));
if ((info = backend_discover (*i)) != 0) {
_backends.insert (make_pair (info->name, info));
}
}
DEBUG_TRACE (DEBUG::AudioEngine, string_compose ("Found %1 backends\n", _backends.size()));
return _backends.size();
}
AudioBackendInfo*
AudioEngine::backend_discover (const string& path)
{
#ifdef PLATFORM_WINDOWS
// do not show popup dialog (e.g. missing libjack.dll)
// win7+ should use SetThreadErrorMode()
SetErrorMode(SEM_FAILCRITICALERRORS);
#endif
Glib::Module module (path);
#ifdef PLATFORM_WINDOWS
SetErrorMode(0); // reset to system default
#endif
AudioBackendInfo* info;
AudioBackendInfo* (*dfunc)(void);
void* func = 0;
if (!module) {
error << string_compose(_("AudioEngine: cannot load module \"%1\" (%2)"), path,
Glib::Module::get_last_error()) << endmsg;
return 0;
}
if (!module.get_symbol ("descriptor", func)) {
error << string_compose(_("AudioEngine: backend at \"%1\" has no descriptor function."), path) << endmsg;
error << Glib::Module::get_last_error() << endmsg;
return 0;
}
dfunc = (AudioBackendInfo* (*)(void))func;
info = dfunc();
if (!info->available()) {
return 0;
}
module.make_resident ();
return info;
}
#ifdef NDEBUG
static bool running_from_source_tree ()
{
// dup ARDOUR_UI_UTILS::running_from_source_tree ()
gchar const *x = g_getenv ("ARDOUR_THEMES_PATH");
return x && (string (x).find ("gtk2_ardour") != string::npos);
}
#endif
vector<const AudioBackendInfo*>
AudioEngine::available_backends() const
{
vector<const AudioBackendInfo*> r;
for (BackendMap::const_iterator i = _backends.begin(); i != _backends.end(); ++i) {
#ifdef NDEBUG
if (i->first == "None (Dummy)" && !running_from_source_tree () && Config->get_hide_dummy_backend ()) {
continue;
}
#endif
r.push_back (i->second);
}
return r;
}
string
AudioEngine::current_backend_name() const
{
if (_backend) {
return _backend->name();
}
return string();
}
void
AudioEngine::drop_backend ()
{
if (_backend) {
_backend->stop ();
// Stopped is needed for Graph to explicitly terminate threads
Stopped (); /* EMIT SIGNAL */
_backend->drop_device ();
_backend.reset ();
_running = false;
}
}
boost::shared_ptr<AudioBackend>
AudioEngine::set_default_backend ()
{
if (_backends.empty()) {
return boost::shared_ptr<AudioBackend>();
}
return set_backend (_backends.begin()->first, "", "");
}
boost::shared_ptr<AudioBackend>
AudioEngine::set_backend (const std::string& name, const std::string& arg1, const std::string& arg2)
{
BackendMap::iterator b = _backends.find (name);
if (b == _backends.end()) {
return boost::shared_ptr<AudioBackend>();
}
drop_backend ();
try {
if (b->second->instantiate (arg1, arg2)) {
throw failed_constructor ();
}
_backend = b->second->factory (*this);
} catch (exception& e) {
error << string_compose (_("Could not create backend for %1: %2"), name, e.what()) << endmsg;
return boost::shared_ptr<AudioBackend>();
}
return _backend;
}
/* BACKEND PROXY WRAPPERS */
int
AudioEngine::start (bool for_latency)
{
if (!_backend) {
return -1;
}
if (_running) {
return 0;
}
_processed_samples = 0;
last_monitor_check = 0;
int error_code = _backend->start (for_latency);
if (error_code != 0) {
_last_backend_error_string = AudioBackend::get_error_string((AudioBackend::ErrorCode) error_code);
return -1;
}
_running = true;
if (_session) {
_session->set_sample_rate (_backend->sample_rate());
if (_session->config.get_jack_time_master()) {
_backend->set_time_master (true);
}
}
/* XXX MIDI ports may not actually be available here yet .. */
PortManager::fill_midi_port_info ();
if (!for_latency) {
Running(); /* EMIT SIGNAL */
}
return 0;
}
int
AudioEngine::stop (bool for_latency)
{
bool stop_engine = true;
if (!_backend) {
return 0;
}
Glib::Threads::Mutex::Lock pl (_process_lock, Glib::Threads::NOT_LOCK);
if (running()) {
pl.acquire ();
}
if (for_latency && _backend->can_change_systemic_latency_when_running()) {
stop_engine = false;
if (_running) {
_backend->start (false); // keep running, reload latencies
}
} else {
if (_backend->stop ()) {
if (pl.locked ()) {
pl.release ();
}
return -1;
}
}
if (pl.locked ()) {
pl.release ();
}
if (_session && _running && stop_engine &&
(_session->state_of_the_state() & Session::Loading) == 0 &&
(_session->state_of_the_state() & Session::Deletion) == 0) {
// it's not a halt, but should be handled the same way:
// disable record, stop transport and I/O processign but save the data.
_session->engine_halted ();
}
if (stop_engine && _running) {
_running = false;
if (!for_latency) {
_started_for_latency = false;
} else if (!_started_for_latency) {
_stopped_for_latency = true;
}
}
_processed_samples = 0;
_measuring_latency = MeasureNone;
_latency_output_port = 0;
_latency_input_port = 0;
if (stop_engine) {
Port::PortDrop ();
}
if (stop_engine) {
Stopped (); /* EMIT SIGNAL */
}
return 0;
}
int
AudioEngine::freewheel (bool start_stop)
{
if (!_backend) {
return -1;
}
/* _freewheeling will be set when first Freewheel signal occurs */
return _backend->freewheel (start_stop);
}
float
AudioEngine::get_dsp_load() const
{
if (!_backend || !_running) {
return 0.0;
}
return _backend->dsp_load ();
}
bool
AudioEngine::is_realtime() const
{
if (!_backend) {
return false;
}
return _backend->is_realtime();
}