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livetrax/libs/backends/dummy/dummy_audiobackend.cc
Paul Davis 66559cd795 Add AudioBackend::info() method to retrieve AudioBackendInfo object
Goal is to be able to call AudioBackendInfo::already_configured() from the right place.
2014-05-01 09:14:25 -04:00

1277 lines
28 KiB
C++

/*
* 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.
*/
#include <sys/time.h>
#include <regex.h>
#include "dummy_audiobackend.h"
#include "pbd/error.h"
#include "i18n.h"
using namespace ARDOUR;
static std::string s_instance_name;
size_t DummyAudioBackend::_max_buffer_size = 8192;
DummyAudioBackend::DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info)
: AudioBackend (e, info)
, _running (false)
, _freewheeling (false)
, _samplerate (48000)
, _samples_per_period (1024)
, _dsp_load (0)
, _n_inputs (0)
, _n_outputs (0)
, _systemic_input_latency (0)
, _systemic_output_latency (0)
, _processed_samples (0)
{
_instance_name = s_instance_name;
}
DummyAudioBackend::~DummyAudioBackend ()
{
}
/* AUDIOBACKEND API */
std::string
DummyAudioBackend::name () const
{
return X_("Dummy");
}
bool
DummyAudioBackend::is_realtime () const
{
return false;
}
std::vector<AudioBackend::DeviceStatus>
DummyAudioBackend::enumerate_devices () const
{
std::vector<AudioBackend::DeviceStatus> s;
s.push_back (DeviceStatus (_("Dummy"), true));
return s;
}
std::vector<float>
DummyAudioBackend::available_sample_rates (const std::string&) const
{
std::vector<float> sr;
sr.push_back (8000.0);
sr.push_back (22050.0);
sr.push_back (24000.0);
sr.push_back (44100.0);
sr.push_back (48000.0);
sr.push_back (88200.0);
sr.push_back (96000.0);
sr.push_back (176400.0);
sr.push_back (192000.0);
return sr;
}
std::vector<uint32_t>
DummyAudioBackend::available_buffer_sizes (const std::string&) const
{
std::vector<uint32_t> bs;
bs.push_back (4);
bs.push_back (8);
bs.push_back (16);
bs.push_back (32);
bs.push_back (64);
bs.push_back (128);
bs.push_back (256);
bs.push_back (512);
bs.push_back (1024);
bs.push_back (2048);
bs.push_back (4096);
bs.push_back (8192);
return bs;
}
uint32_t
DummyAudioBackend::available_input_channel_count (const std::string&) const
{
return 128;
}
uint32_t
DummyAudioBackend::available_output_channel_count (const std::string&) const
{
return 128;
}
bool
DummyAudioBackend::can_change_sample_rate_when_running () const
{
return true;
}
bool
DummyAudioBackend::can_change_buffer_size_when_running () const
{
return true;
}
int
DummyAudioBackend::set_device_name (const std::string&)
{
return 0;
}
int
DummyAudioBackend::set_sample_rate (float sr)
{
if (sr <= 0) { return -1; }
_samplerate = sr;
engine.sample_rate_change (sr);
return 0;
}
int
DummyAudioBackend::set_buffer_size (uint32_t bs)
{
if (bs <= 0 || bs >= _max_buffer_size) {
return -1;
}
_samples_per_period = bs;
engine.buffer_size_change (bs);
return 0;
}
int
DummyAudioBackend::set_interleaved (bool yn)
{
if (!yn) { return 0; }
return -1;
}
int
DummyAudioBackend::set_input_channels (uint32_t cc)
{
_n_inputs = cc;
return 0;
}
int
DummyAudioBackend::set_output_channels (uint32_t cc)
{
_n_outputs = cc;
return 0;
}
int
DummyAudioBackend::set_systemic_input_latency (uint32_t sl)
{
_systemic_input_latency = sl;
return 0;
}
int
DummyAudioBackend::set_systemic_output_latency (uint32_t sl)
{
_systemic_output_latency = sl;
return 0;
}
/* Retrieving parameters */
std::string
DummyAudioBackend::device_name () const
{
return _("Dummy Device");
}
float
DummyAudioBackend::sample_rate () const
{
return _samplerate;
}
uint32_t
DummyAudioBackend::buffer_size () const
{
return _samples_per_period;
}
bool
DummyAudioBackend::interleaved () const
{
return false;
}
uint32_t
DummyAudioBackend::input_channels () const
{
return _n_inputs;
}
uint32_t
DummyAudioBackend::output_channels () const
{
return _n_outputs;
}
uint32_t
DummyAudioBackend::systemic_input_latency () const
{
return _systemic_input_latency;
}
uint32_t
DummyAudioBackend::systemic_output_latency () const
{
return _systemic_output_latency;
}
/* MIDI */
std::vector<std::string>
DummyAudioBackend::enumerate_midi_options () const
{
std::vector<std::string> m;
m.push_back (_("None"));
return m;
}
int
DummyAudioBackend::set_midi_option (const std::string&)
{
return -1;
}
std::string
DummyAudioBackend::midi_option () const
{
return "";
}
/* State Control */
static void * pthread_process (void *arg)
{
DummyAudioBackend *d = static_cast<DummyAudioBackend *>(arg);
d->main_process_thread ();
pthread_exit (0);
return 0;
}
int
DummyAudioBackend::_start (bool /*for_latency_measurement*/)
{
if (_running) {
PBD::error << _("DummyAudioBackend: already active.") << endmsg;
return -1;
}
if (_ports.size()) {
PBD::warning << _("DummyAudioBackend: recovering from unclean shutdown, port registry is not empty.") << endmsg;
_ports.clear();
}
if (register_system_ports()) {
PBD::error << _("DummyAudioBackend: failed to register system ports.") << endmsg;
return -1;
}
if (engine.reestablish_ports ()) {
PBD::error << _("DummyAudioBackend: Could not re-establish ports.") << endmsg;
stop ();
return -1;
}
engine.reconnect_ports ();
if (pthread_create (&_main_thread, NULL, pthread_process, this)) {
PBD::error << _("DummyAudioBackend: cannot start.") << endmsg;
}
int timeout = 5000;
while (!_running && --timeout > 0) { usleep (1000); }
if (timeout == 0 || !_running) {
PBD::error << _("DummyAudioBackend: failed to start process thread.") << endmsg;
return -1;
}
return 0;
}
int
DummyAudioBackend::stop ()
{
void *status;
if (!_running) {
return -1;
}
_running = false;
if (pthread_join (_main_thread, &status)) {
PBD::error << _("DummyAudioBackend: failed to terminate.") << endmsg;
return -1;
}
unregister_system_ports();
return 0;
}
int
DummyAudioBackend::freewheel (bool onoff)
{
if (onoff == _freewheeling) {
return 0;
}
_freewheeling = onoff;
engine.freewheel_callback (onoff);
return 0;
}
float
DummyAudioBackend::dsp_load () const
{
return 100.f * _dsp_load;
}
size_t
DummyAudioBackend::raw_buffer_size (DataType t)
{
switch (t) {
case DataType::AUDIO:
return _max_buffer_size * sizeof(Sample);
case DataType::MIDI:
return _max_buffer_size; // XXX not really limited
}
return 0;
}
/* Process time */
pframes_t
DummyAudioBackend::sample_time ()
{
return _processed_samples;
}
pframes_t
DummyAudioBackend::sample_time_at_cycle_start ()
{
return _processed_samples;
}
pframes_t
DummyAudioBackend::samples_since_cycle_start ()
{
return 0;
}
void *
DummyAudioBackend::dummy_process_thread (void *arg)
{
ThreadData* td = reinterpret_cast<ThreadData*> (arg);
boost::function<void ()> f = td->f;
delete td;
f ();
return 0;
}
int
DummyAudioBackend::create_process_thread (boost::function<void()> func)
{
pthread_t thread_id;
pthread_attr_t attr;
size_t stacksize = 100000;
pthread_attr_init (&attr);
pthread_attr_setstacksize (&attr, stacksize);
ThreadData* td = new ThreadData (this, func, stacksize);
if (pthread_create (&thread_id, &attr, dummy_process_thread, td)) {
PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
return -1;
}
_threads.push_back (thread_id);
return 0;
}
int
DummyAudioBackend::join_process_threads ()
{
int rv = 0;
for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
{
void *status;
if (pthread_join (*i, &status)) {
PBD::error << _("AudioEngine: cannot terminate process thread.") << endmsg;
rv -= 1;
}
}
_threads.clear ();
return rv;
}
bool
DummyAudioBackend::in_process_thread ()
{
for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
{
#ifdef COMPILER_MINGW
if (*i == GetCurrentThread ()) {
return true;
}
#else // pthreads
if (pthread_equal (*i, pthread_self ()) != 0) {
return true;
}
#endif
}
return false;
}
uint32_t
DummyAudioBackend::process_thread_count ()
{
return _threads.size ();
}
void
DummyAudioBackend::update_latencies ()
{
}
/* PORTENGINE API */
void*
DummyAudioBackend::private_handle () const
{
return NULL;
}
const std::string&
DummyAudioBackend::my_name () const
{
return _instance_name;
}
bool
DummyAudioBackend::available () const
{
return true;
}
uint32_t
DummyAudioBackend::port_name_size () const
{
return 256;
}
int
DummyAudioBackend::set_port_name (PortEngine::PortHandle port, const std::string& name)
{
if (!valid_port (port)) {
PBD::error << _("DummyBackend::set_port_name: Invalid Port(s)") << endmsg;
return -1;
}
return static_cast<DummyPort*>(port)->set_name (_instance_name + ":" + name);
}
std::string
DummyAudioBackend::get_port_name (PortEngine::PortHandle port) const
{
if (!valid_port (port)) {
PBD::error << _("DummyBackend::get_port_name: Invalid Port(s)") << endmsg;
return std::string ();
}
return static_cast<DummyPort*>(port)->name ();
}
PortEngine::PortHandle
DummyAudioBackend::get_port_by_name (const std::string& name) const
{
PortHandle port = (PortHandle) find_port (name);
return port;
}
int
DummyAudioBackend::get_ports (
const std::string& port_name_pattern,
DataType type, PortFlags flags,
std::vector<std::string>& port_names) const
{
int rv = 0;
regex_t port_regex;
bool use_regexp = false;
if (port_name_pattern.size () > 0) {
if (!regcomp (&port_regex, port_name_pattern.c_str (), REG_EXTENDED|REG_NOSUB)) {
use_regexp = true;
}
}
for (size_t i = 0; i < _ports.size (); ++i) {
DummyPort* port = _ports[i];
if ((port->type () == type) && (port->flags () & flags)) {
if (!use_regexp || !regexec (&port_regex, port->name ().c_str (), 0, NULL, 0)) {
port_names.push_back (port->name ());
++rv;
}
}
}
if (use_regexp) {
regfree (&port_regex);
}
return rv;
}
DataType
DummyAudioBackend::port_data_type (PortEngine::PortHandle port) const
{
if (!valid_port (port)) {
return DataType::NIL;
}
return static_cast<DummyPort*>(port)->type ();
}
PortEngine::PortHandle
DummyAudioBackend::register_port (
const std::string& name,
ARDOUR::DataType type,
ARDOUR::PortFlags flags)
{
if (name.size () == 0) { return 0; }
if (flags & IsPhysical) { return 0; }
return add_port (_instance_name + ":" + name, type, flags);
}
PortEngine::PortHandle
DummyAudioBackend::add_port (
const std::string& name,
ARDOUR::DataType type,
ARDOUR::PortFlags flags)
{
assert(name.size ());
if (find_port (name)) {
PBD::error << _("DummyBackend::register_port: Port already exists:")
<< " (" << name << ")" << endmsg;
return 0;
}
DummyPort* port = NULL;
switch (type) {
case DataType::AUDIO:
port = new DummyAudioPort (name, flags);
break;
case DataType::MIDI:
port = new DummyMidiPort (name, flags);
break;
default:
PBD::error << _("DummyBackend::register_port: Invalid Data Type.") << endmsg;
return 0;
}
_ports.push_back (port);
return port;
}
void
DummyAudioBackend::unregister_port (PortEngine::PortHandle port_handle)
{
if (!valid_port (port_handle)) {
PBD::error << _("DummyBackend::unregister_port: Invalid Port.") << endmsg;
}
DummyPort* port = static_cast<DummyPort*>(port_handle);
std::vector<DummyPort*>::iterator i = std::find (_ports.begin (), _ports.end (), static_cast<DummyPort*>(port_handle));
if (i == _ports.end ()) {
PBD::error << _("DummyBackend::unregister_port: Failed to find port") << endmsg;
return;
}
disconnect_all(port_handle);
_ports.erase (i);
delete port;
}
int
DummyAudioBackend::register_system_ports()
{
LatencyRange lr;
const int a_ins = _n_inputs > 0 ? _n_inputs : 8;
const int a_out = _n_outputs > 0 ? _n_outputs : 8;
const int m_ins = 2; // TODO
const int m_out = 2;
/* audio ports */
lr.min = lr.max = _samples_per_period + _systemic_input_latency;
for (int i = 1; i <= a_ins; ++i) {
char tmp[64];
snprintf(tmp, sizeof(tmp), "system:capture_%d", i);
PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
if (!p) return -1;
set_latency_range (p, false, lr);
}
lr.min = lr.max = _samples_per_period + _systemic_output_latency;
for (int i = 1; i <= a_out; ++i) {
char tmp[64];
snprintf(tmp, sizeof(tmp), "system:playback_%d", i);
PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
if (!p) return -1;
set_latency_range (p, false, lr);
}
/* midi ports */
lr.min = lr.max = _samples_per_period + _systemic_input_latency;
for (int i = 1; i <= m_ins; ++i) {
char tmp[64];
snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", i);
PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
if (!p) return -1;
set_latency_range (p, false, lr);
}
lr.min = lr.max = _samples_per_period + _systemic_output_latency;
for (int i = 1; i <= m_out; ++i) {
char tmp[64];
snprintf(tmp, sizeof(tmp), "system:midi_playback_%d", i);
PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
if (!p) return -1;
set_latency_range (p, false, lr);
}
return 0;
}
void
DummyAudioBackend::unregister_system_ports()
{
size_t i = 0;
while (i < _ports.size ()) {
DummyPort* port = _ports[i];
if (port->is_physical () && port->is_terminal ()) {
port->disconnect_all ();
_ports.erase (_ports.begin() + i);
} else {
++i;
}
}
}
int
DummyAudioBackend::connect (const std::string& src, const std::string& dst)
{
DummyPort* src_port = find_port (src);
DummyPort* dst_port = find_port (dst);
if (!src_port) {
PBD::error << _("DummyBackend::connect: Invalid Source port:")
<< " (" << src <<")" << endmsg;
return -1;
}
if (!dst_port) {
PBD::error << _("DummyBackend::connect: Invalid Destination port:")
<< " (" << dst <<")" << endmsg;
return -1;
}
return src_port->connect (dst_port);
}
int
DummyAudioBackend::disconnect (const std::string& src, const std::string& dst)
{
DummyPort* src_port = find_port (src);
DummyPort* dst_port = find_port (dst);
if (!src_port || !dst_port) {
PBD::error << _("DummyBackend::disconnect: Invalid Port(s)") << endmsg;
return -1;
}
return src_port->disconnect (dst_port);
}
int
DummyAudioBackend::connect (PortEngine::PortHandle src, const std::string& dst)
{
DummyPort* dst_port = find_port (dst);
if (!valid_port (src)) {
PBD::error << _("DummyBackend::connect: Invalid Source Port Handle") << endmsg;
return -1;
}
if (!dst_port) {
PBD::error << _("DummyBackend::connect: Invalid Destination Port")
<< " (" << dst << ")" << endmsg;
return -1;
}
return static_cast<DummyPort*>(src)->connect (dst_port);
}
int
DummyAudioBackend::disconnect (PortEngine::PortHandle src, const std::string& dst)
{
DummyPort* dst_port = find_port (dst);
if (!valid_port (src) || !dst_port) {
PBD::error << _("DummyBackend::disconnect: Invalid Port(s)") << endmsg;
return -1;
}
return static_cast<DummyPort*>(src)->disconnect (dst_port);
}
int
DummyAudioBackend::disconnect_all (PortEngine::PortHandle port)
{
if (!valid_port (port)) {
PBD::error << _("DummyBackend::disconnect_all: Invalid Port") << endmsg;
return -1;
}
static_cast<DummyPort*>(port)->disconnect_all ();
return 0;
}
bool
DummyAudioBackend::connected (PortEngine::PortHandle port, bool /* process_callback_safe*/)
{
if (!valid_port (port)) {
PBD::error << _("DummyBackend::disconnect_all: Invalid Port") << endmsg;
return false;
}
return static_cast<DummyPort*>(port)->is_connected ();
}
bool
DummyAudioBackend::connected_to (PortEngine::PortHandle src, const std::string& dst, bool /*process_callback_safe*/)
{
DummyPort* dst_port = find_port (dst);
if (!valid_port (src) || !dst_port) {
PBD::error << _("DummyBackend::connected_to: Invalid Port") << endmsg;
return false;
}
return static_cast<DummyPort*>(src)->is_connected (dst_port);
}
bool
DummyAudioBackend::physically_connected (PortEngine::PortHandle port, bool /*process_callback_safe*/)
{
if (!valid_port (port)) {
PBD::error << _("DummyBackend::physically_connected: Invalid Port") << endmsg;
return false;
}
return static_cast<DummyPort*>(port)->is_physically_connected ();
}
int
DummyAudioBackend::get_connections (PortEngine::PortHandle port, std::vector<std::string>& names, bool /*process_callback_safe*/)
{
if (!valid_port (port)) {
PBD::error << _("DummyBackend::get_connections: Invalid Port") << endmsg;
return -1;
}
assert (0 == names.size ());
const std::vector<DummyPort*>& connected_ports = static_cast<DummyPort*>(port)->get_connections ();
for (std::vector<DummyPort*>::const_iterator i = connected_ports.begin (); i != connected_ports.end (); ++i) {
names.push_back ((*i)->name ());
}
return (int)names.size ();
}
/* MIDI */
int
DummyAudioBackend::midi_event_get (
pframes_t& timestamp,
size_t& size, uint8_t** buf, void* port_buffer,
uint32_t event_index)
{
assert (buf && port_buffer);
DummyMidiBuffer& source = * static_cast<DummyMidiBuffer*>(port_buffer);
if (event_index >= source.size ()) {
return -1;
}
DummyMidiEvent * const event = source[event_index].get ();
timestamp = event->timestamp ();
size = event->size ();
*buf = event->data ();
return 0;
}
int
DummyAudioBackend::midi_event_put (
void* port_buffer,
pframes_t timestamp,
const uint8_t* buffer, size_t size)
{
assert (buffer && port_buffer);
DummyMidiBuffer& dst = * static_cast<DummyMidiBuffer*>(port_buffer);
if (dst.size () && (pframes_t)dst.back ()->timestamp () > timestamp) {
fprintf (stderr, "DummyMidiBuffer: it's too late for this event.\n");
return -1;
}
dst.push_back (boost::shared_ptr<DummyMidiEvent>(new DummyMidiEvent (timestamp, buffer, size)));
return 0;
}
uint32_t
DummyAudioBackend::get_midi_event_count (void* port_buffer)
{
assert (port_buffer && _running);
return static_cast<DummyMidiBuffer*>(port_buffer)->size ();
}
void
DummyAudioBackend::midi_clear (void* port_buffer)
{
assert (port_buffer && _running);
DummyMidiBuffer * buf = static_cast<DummyMidiBuffer*>(port_buffer);
assert (buf);
buf->clear ();
}
/* Monitoring */
bool
DummyAudioBackend::can_monitor_input () const
{
return false;
}
int
DummyAudioBackend::request_input_monitoring (PortEngine::PortHandle, bool)
{
return -1;
}
int
DummyAudioBackend::ensure_input_monitoring (PortEngine::PortHandle, bool)
{
return -1;
}
bool
DummyAudioBackend::monitoring_input (PortEngine::PortHandle)
{
return false;
}
/* Latency management */
void
DummyAudioBackend::set_latency_range (PortEngine::PortHandle port, bool for_playback, LatencyRange latency_range)
{
if (!valid_port (port)) {
PBD::error << _("DummyPort::set_latency_range (): invalid port.") << endmsg;
}
static_cast<DummyPort*>(port)->set_latency_range (latency_range, for_playback);
}
LatencyRange
DummyAudioBackend::get_latency_range (PortEngine::PortHandle port, bool for_playback)
{
if (!valid_port (port)) {
PBD::error << _("DummyPort::get_latency_range (): invalid port.") << endmsg;
LatencyRange r;
r.min = 0;
r.max = 0;
return r;
}
return static_cast<DummyPort*>(port)->latency_range (for_playback);
}
/* Discovering physical ports */
bool
DummyAudioBackend::port_is_physical (PortEngine::PortHandle port) const
{
if (!valid_port (port)) {
PBD::error << _("DummyPort::port_is_physical (): invalid port.") << endmsg;
return false;
}
return static_cast<DummyPort*>(port)->is_physical ();
}
void
DummyAudioBackend::get_physical_outputs (DataType type, std::vector<std::string>& port_names)
{
for (size_t i = 0; i < _ports.size (); ++i) {
DummyPort* port = _ports[i];
if ((port->type () == type) && port->is_output () && port->is_physical ()) {
port_names.push_back (port->name ());
}
}
}
void
DummyAudioBackend::get_physical_inputs (DataType type, std::vector<std::string>& port_names)
{
for (size_t i = 0; i < _ports.size (); ++i) {
DummyPort* port = _ports[i];
if ((port->type () == type) && port->is_input () && port->is_physical ()) {
port_names.push_back (port->name ());
}
}
}
ChanCount
DummyAudioBackend::n_physical_outputs () const
{
int n_midi = 0;
int n_audio = 0;
for (size_t i = 0; i < _ports.size (); ++i) {
DummyPort* port = _ports[i];
if (port->is_output () && port->is_physical ()) {
switch (port->type ()) {
case DataType::AUDIO: ++n_audio; break;
case DataType::MIDI: ++n_midi; break;
default: break;
}
}
}
ChanCount cc;
cc.set (DataType::AUDIO, n_audio);
cc.set (DataType::MIDI, n_midi);
return cc;
}
ChanCount
DummyAudioBackend::n_physical_inputs () const
{
int n_midi = 0;
int n_audio = 0;
for (size_t i = 0; i < _ports.size (); ++i) {
DummyPort* port = _ports[i];
if (port->is_input () && port->is_physical ()) {
switch (port->type ()) {
case DataType::AUDIO: ++n_audio; break;
case DataType::MIDI: ++n_midi; break;
default: break;
}
}
}
ChanCount cc;
cc.set (DataType::AUDIO, n_audio);
cc.set (DataType::MIDI, n_midi);
return cc;
}
/* Getting access to the data buffer for a port */
void*
DummyAudioBackend::get_buffer (PortEngine::PortHandle port, pframes_t nframes)
{
assert (port && _running);
assert (valid_port (port));
return static_cast<DummyPort*>(port)->get_buffer (nframes);
}
/* Engine Process */
void *
DummyAudioBackend::main_process_thread ()
{
AudioEngine::thread_init_callback (this);
_running = true;
_processed_samples = 0;
struct timeval clock1, clock2;
::gettimeofday (&clock1, NULL);
while (_running) {
if (engine.process_callback (_samples_per_period)) {
return 0;
}
_processed_samples += _samples_per_period;
if (!_freewheeling) {
::gettimeofday (&clock2, NULL);
const int elapsed_time = (clock2.tv_sec - clock1.tv_sec) * 1000000 + (clock2.tv_usec - clock1.tv_usec);
const int nomial_time = 1000000 * _samples_per_period / _samplerate;
_dsp_load = elapsed_time / (float) nomial_time;
if (elapsed_time < nomial_time) {
::usleep (nomial_time - elapsed_time);
} else {
::usleep (100); // don't hog cpu
}
} else {
_dsp_load = 1.0;
::usleep (100); // don't hog cpu
}
::gettimeofday (&clock1, NULL);
}
_running = false;
return 0;
}
/******************************************************************************/
static boost::shared_ptr<DummyAudioBackend> _instance;
static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
static int instantiate (const std::string& arg1, const std::string& /* arg2 */);
static int deinstantiate ();
static bool already_configured ();
static ARDOUR::AudioBackendInfo _descriptor = {
"Dummy",
instantiate,
deinstantiate,
backend_factory,
already_configured,
};
static boost::shared_ptr<AudioBackend>
backend_factory (AudioEngine& e)
{
if (!_instance) {
_instance.reset (new DummyAudioBackend (e, _descriptor));
}
return _instance;
}
static int
instantiate (const std::string& arg1, const std::string& /* arg2 */)
{
s_instance_name = arg1;
return 0;
}
static int
deinstantiate ()
{
_instance.reset ();
return 0;
}
static bool
already_configured ()
{
return false;
}
extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
{
return &_descriptor;
}
/******************************************************************************/
DummyPort::DummyPort (const std::string& name, PortFlags flags)
: _name (name)
, _flags (flags)
{
_capture_latency_range.min = 0;
_capture_latency_range.max = 0;
_playback_latency_range.min = 0;
_playback_latency_range.max = 0;
}
DummyPort::~DummyPort () {
disconnect_all ();
}
int DummyPort::connect (DummyPort *port)
{
if (!port) {
PBD::error << _("DummyPort::connect (): invalid (null) port") << endmsg;
return -1;
}
if (type () != port->type ()) {
PBD::error << _("DummyPort::connect (): wrong port-type") << endmsg;
return -1;
}
if (is_output () && port->is_output ()) {
PBD::error << _("DummyPort::connect (): cannot inter-connect output ports.") << endmsg;
return -1;
}
if (is_input () && port->is_input ()) {
PBD::error << _("DummyPort::connect (): cannot inter-connect input ports.") << endmsg;
return -1;
}
if (this == port) {
PBD::error << _("DummyPort::connect (): cannot self-connect ports.") << endmsg;
return -1;
}
if (is_connected (port)) {
#if 0 // don't bother to warn about this for now. just ignore it
PBD::error << _("DummyPort::connect (): ports are already connected:")
<< " (" << name () << ") -> (" << port->name () << ")"
<< endmsg;
#endif
return -1;
}
_connect (port, true);
return 0;
}
void DummyPort::_connect (DummyPort *port, bool callback)
{
_connections.push_back (port);
if (callback) {
port->_connect (this, false);
}
}
int DummyPort::disconnect (DummyPort *port)
{
if (!port) {
PBD::error << _("DummyPort::disconnect (): invalid (null) port") << endmsg;
return -1;
}
if (!is_connected (port)) {
PBD::error << _("DummyPort::disconnect (): ports are not connected:")
<< " (" << name () << ") -> (" << port->name () << ")"
<< endmsg;
return -1;
}
_disconnect (port, true);
return 0;
}
void DummyPort::_disconnect (DummyPort *port, bool callback)
{
std::vector<DummyPort*>::iterator it = std::find (_connections.begin (), _connections.end (), port);
assert (it != _connections.end ());
_connections.erase (it);
if (callback) {
port->_disconnect (this, false);
}
}
void DummyPort::disconnect_all ()
{
while (!_connections.empty ()) {
_connections.back ()->_disconnect (this, false);
_connections.pop_back ();
}
}
bool
DummyPort::is_connected (const DummyPort *port) const
{
return std::find (_connections.begin (), _connections.end (), port) != _connections.end ();
}
bool DummyPort::is_physically_connected () const
{
for (std::vector<DummyPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
if ((*it)->is_physical ()) {
return true;
}
}
return false;
}
/******************************************************************************/
DummyAudioPort::DummyAudioPort (const std::string& name, PortFlags flags)
: DummyPort (name, flags)
{
memset (_buffer, 0, sizeof (_buffer));
}
DummyAudioPort::~DummyAudioPort () { }
void* DummyAudioPort::get_buffer (pframes_t n_samples)
{
if (is_input ()) {
std::vector<DummyPort*>::const_iterator it = get_connections ().begin ();
if (it == get_connections ().end ()) {
memset (_buffer, 0, n_samples * sizeof (Sample));
} else {
DummyAudioPort const * source = static_cast<const DummyAudioPort*>(*it);
assert (source && source->is_output ());
memcpy (_buffer, source->const_buffer (), n_samples * sizeof (Sample));
while (++it != get_connections ().end ()) {
source = static_cast<const DummyAudioPort*>(*it);
assert (source && source->is_output ());
Sample* dst = buffer ();
const Sample* src = source->const_buffer ();
for (uint32_t s = 0; s < n_samples; ++s, ++dst, ++src) {
*dst += *src;
}
}
}
} else if (is_output () && is_physical () && is_terminal()) {
memset (_buffer, 0, n_samples * sizeof (Sample));
}
return _buffer;
}
DummyMidiPort::DummyMidiPort (const std::string& name, PortFlags flags)
: DummyPort (name, flags)
{
_buffer.clear ();
}
DummyMidiPort::~DummyMidiPort () { }
void* DummyMidiPort::get_buffer (pframes_t /* nframes */)
{
if (is_input ()) {
_buffer.clear ();
for (std::vector<DummyPort*>::const_iterator i = get_connections ().begin ();
i != get_connections ().end ();
++i) {
const DummyMidiBuffer src = static_cast<const DummyMidiPort*>(*i)->const_buffer ();
for (DummyMidiBuffer::const_iterator it = src.begin (); it != src.end (); ++it) {
_buffer.push_back (boost::shared_ptr<DummyMidiEvent>(new DummyMidiEvent (**it)));
}
}
std::sort (_buffer.begin (), _buffer.end ());
} else if (is_output () && is_physical () && is_terminal()) {
_buffer.clear ();
}
return &_buffer;
}
DummyMidiEvent::DummyMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size)
: _size (size)
, _timestamp (timestamp)
, _data (0)
{
if (size > 0) {
_data = (uint8_t*) malloc (size);
memcpy (_data, data, size);
}
}
DummyMidiEvent::DummyMidiEvent (const DummyMidiEvent& other)
: _size (other.size ())
, _timestamp (other.timestamp ())
, _data (0)
{
if (other.size () && other.const_data ()) {
_data = (uint8_t*) malloc (other.size ());
memcpy (_data, other.const_data (), other.size ());
}
};
DummyMidiEvent::~DummyMidiEvent () {
free (_data);
};