, _pcmi (0)
, _run (false)
, _active (false)
+ , _freewheel (false)
, _freewheeling (false)
, _measure_latency (false)
+ , _last_process_start (0)
+ , _process_speed_samples_per_ms (0)
, _audio_device("")
, _midi_driver_option(_("None"))
, _device_reservation(0)
std::map<std::string, std::string> devices;
get_alsa_audio_device_names(devices);
for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
+ if (_audio_device == "") _audio_device = i->first;
_audio_device_status.push_back (DeviceStatus (i->first, true));
}
return _audio_device_status;
bool
AlsaAudioBackend::can_change_buffer_size_when_running () const
{
- return false;
+ return false; // why not? :)
}
int
if (bs <= 0 || bs >= _max_buffer_size) {
return -1;
}
+ if (_run) {
+ return -1;
+ }
_samples_per_period = bs;
engine.buffer_size_change (bs);
return 0;
AlsaAudioBackend::enumerate_midi_options () const
{
if (_midi_options.empty()) {
- _midi_options.push_back (_("None"));
_midi_options.push_back (_("ALSA raw devices"));
_midi_options.push_back (_("ALSA sequencer"));
+ _midi_options.push_back (_("None"));
}
return _midi_options;
}
_ports.clear();
}
+ /* reset internal state */
+ _dsp_load = 0;
+ _freewheeling = false;
+ _freewheel = false;
+ _last_process_start = 0;
+ _process_speed_samples_per_ms = 0;
+
release_device();
assert(_rmidi_in.size() == 0);
int
AlsaAudioBackend::freewheel (bool onoff)
{
- if (onoff == _freewheeling) {
- return 0;
- }
_freewheeling = onoff;
- engine.freewheel_callback (onoff);
return 0;
}
}
/* Process time */
-pframes_t
+framepos_t
AlsaAudioBackend::sample_time ()
{
return _processed_samples;
}
-pframes_t
+framepos_t
AlsaAudioBackend::sample_time_at_cycle_start ()
{
return _processed_samples;
pframes_t
AlsaAudioBackend::samples_since_cycle_start ()
{
- return 0;
+ if (!_active || !_run || _freewheeling || _freewheel) {
+ return 0;
+ }
+ if (_last_process_start == 0 || _process_speed_samples_per_ms) {
+ return 0;
+ }
+
+ const int64_t elapsed_time_us = _last_process_start - g_get_monotonic_time();
+
+ assert(elapsed_time_us >=0);
+
+ /* linear extrapolation, using [low pass] filtered process-speed. */
+ const pframes_t processed_samples = elapsed_time_us * _process_speed_samples_per_ms * 1e-3;
+
+ if (processed_samples >= _samples_per_period) {
+ return _samples_per_period;
+ }
+ return processed_samples;
}
bool
AlsaAudioBackend::in_process_thread ()
{
+ if (pthread_equal (_main_thread, pthread_self()) != 0) {
+ return true;
+ }
+
for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
{
if (pthread_equal (*i, pthread_self ()) != 0) {
const int a_out = _n_outputs > 0 ? _n_outputs : 2;
/* audio ports */
- lr.min = lr.max = _samples_per_period + (_measure_latency ? 0 : _systemic_audio_input_latency);
+ lr.min = lr.max = (_measure_latency ? 0 : _systemic_audio_input_latency);
for (int i = 1; i <= a_ins; ++i) {
char tmp[64];
snprintf(tmp, sizeof(tmp), "system:capture_%d", i);
_system_inputs.push_back(static_cast<AlsaPort*>(p));
}
- lr.min = lr.max = _samples_per_period + (_measure_latency ? 0 : _systemic_audio_output_latency);
+ lr.min = lr.max = (_measure_latency ? 0 : _systemic_audio_output_latency);
for (int i = 1; i <= a_out; ++i) {
char tmp[64];
snprintf(tmp, sizeof(tmp), "system:playback_%d", i);
delete mout;
}
LatencyRange lr;
- lr.min = lr.max = _samples_per_period + (_measure_latency ? 0 : nfo->systemic_output_latency);
+ lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_output_latency);
set_latency_range (p, false, lr);
static_cast<AlsaMidiPort*>(p)->set_n_periods(2);
_system_midi_out.push_back(static_cast<AlsaPort*>(p));
continue;
}
LatencyRange lr;
- lr.min = lr.max = _samples_per_period + (_measure_latency ? 0 : nfo->systemic_input_latency);
+ lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_input_latency);
set_latency_range (p, false, lr);
_system_midi_in.push_back(static_cast<AlsaPort*>(p));
_rmidi_in.push_back (midin);
assert (buffer && port_buffer);
AlsaMidiBuffer& dst = * static_cast<AlsaMidiBuffer*>(port_buffer);
if (dst.size () && (pframes_t)dst.back ()->timestamp () > timestamp) {
+#ifndef NDEBUG
+ // nevermind, ::get_buffer() sorts events
fprintf (stderr, "AlsaMidiBuffer: it's too late for this event. %d > %d\n",
(pframes_t)dst.back ()->timestamp (), timestamp);
- return -1;
+#endif
}
dst.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (timestamp, buffer, size)));
return 0;
LatencyRange
AlsaAudioBackend::get_latency_range (PortEngine::PortHandle port, bool for_playback)
{
+ LatencyRange r;
if (!valid_port (port)) {
PBD::error << _("AlsaPort::get_latency_range (): invalid port.") << endmsg;
- LatencyRange r;
r.min = 0;
r.max = 0;
return r;
}
- return static_cast<AlsaPort*>(port)->latency_range (for_playback);
+ AlsaPort *p = static_cast<AlsaPort*>(port);
+ assert(p);
+
+ r = p->latency_range (for_playback);
+ if (p->is_physical() && p->is_terminal()) {
+ if (p->is_input() && for_playback) {
+ r.min += _samples_per_period;
+ r.max += _samples_per_period;
+ }
+ if (p->is_output() && !for_playback) {
+ r.min += _samples_per_period;
+ r.max += _samples_per_period;
+ }
+ }
+ return r;
}
/* Discovering physical ports */
_processed_samples = 0;
uint64_t clock1, clock2;
- clock1 = g_get_monotonic_time();
_pcmi->pcm_start ();
int no_proc_errors = 0;
const int bailout = 2 * _samplerate / _samples_per_period;
while (_run) {
long nr;
bool xrun = false;
- if (!_freewheeling) {
+
+ if (_freewheeling != _freewheel) {
+ _freewheel = _freewheeling;
+ engine.freewheel_callback (_freewheel);
+ }
+
+ if (!_freewheel) {
nr = _pcmi->pcm_wait ();
if (_pcmi->state () > 0) {
++no_proc_errors;
xrun = true;
}
- if (_pcmi->state () < 0 || no_proc_errors > bailout) {
+ if (_pcmi->state () < 0) {
PBD::error << _("AlsaAudioBackend: I/O error. Audio Process Terminated.") << endmsg;
break;
}
- while (nr >= (long)_samples_per_period) {
+ if (no_proc_errors > bailout) {
+ PBD::error
+ << string_compose (
+ _("AlsaAudioBackend: Audio Process Terminated after %1 consecutive x-runs."),
+ no_proc_errors)
+ << endmsg;
+ break;
+ }
+
+ while (nr >= (long)_samples_per_period && _freewheeling == _freewheel) {
uint32_t i = 0;
clock1 = g_get_monotonic_time();
no_proc_errors = 0;
}
_pcmi->capt_done (_samples_per_period);
- /* de-queue midi*/
+ /* de-queue incoming midi*/
i = 0;
for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
assert (_rmidi_in.size() > i);
memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
}
+ /* call engine process callback */
+ _last_process_start = g_get_monotonic_time();
if (engine.process_callback (_samples_per_period)) {
_pcmi->pcm_stop ();
_active = false;
return 0;
}
- i = 0;
- for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
+ for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
static_cast<AlsaMidiPort*>(*it)->next_period();
}
- /* queue midi */
+ /* queue outgoing midi */
i = 0;
for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
assert (_rmidi_out.size() > i);
- const AlsaMidiBuffer src = static_cast<const AlsaMidiPort*>(*it)->const_buffer();
+ const AlsaMidiBuffer * src = static_cast<const AlsaMidiPort*>(*it)->const_buffer();
AlsaMidiOut *rm = _rmidi_out.at(i);
rm->sync_time (clock1);
- for (AlsaMidiBuffer::const_iterator mit = src.begin (); mit != src.end (); ++mit) {
+ for (AlsaMidiBuffer::const_iterator mit = src->begin (); mit != src->end (); ++mit) {
rm->send_event ((*mit)->timestamp(), (*mit)->data(), (*mit)->size());
}
}
clock2 = g_get_monotonic_time();
const int64_t elapsed_time = clock2 - clock1;
_dsp_load = elapsed_time / (float) nomial_time;
+
+ const double ps = 1e3 * _samples_per_period / elapsed_time;
+ // low pass filter, The time-constant should really be
+ // 1.0 - e^(-2.0 * π * v / SR);
+ // with v = _samples_per_period / N, and SR = _samples_per_period;
+ _process_speed_samples_per_ms = _process_speed_samples_per_ms + .05 * (ps - _process_speed_samples_per_ms) + 1e-12;
}
if (xrun && (_pcmi->capt_xrun() > 0 || _pcmi->play_xrun() > 0)) {
engine.Xrun ();
#if 0
- fprintf(stderr, "ALSA x-run read: %.1f ms, write: %.1f ms\n",
+ fprintf(stderr, "ALSA x-run read: %.2f ms, write: %.2f ms\n",
_pcmi->capt_xrun() * 1000.0, _pcmi->play_xrun() * 1000.0);
#endif
}
} else {
// Freewheelin'
+
+ // zero audio input buffers
for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
}
- for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it) {
+
+ clock1 = g_get_monotonic_time();
+ uint32_t i = 0;
+ for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
static_cast<AlsaMidiBuffer*>((*it)->get_buffer(0))->clear ();
+ AlsaMidiIn *rm = _rmidi_in.at(i);
+ void *bptr = (*it)->get_buffer(0);
+ midi_clear(bptr); // zero midi buffer
+
+ // TODO add an API call for this.
+ pframes_t time;
+ uint8_t data[64]; // match MaxAlsaEventSize in alsa_rawmidi.cc
+ size_t size = sizeof(data);
+ while (rm->recv_event (time, data, size)) {
+ ; // discard midi-data from HW.
+ }
+ rm->sync_time (clock1);
}
+ _last_process_start = 0;
if (engine.process_callback (_samples_per_period)) {
_pcmi->pcm_stop ();
+ _active = false;
return 0;
}
+
+ // drop all outgoing MIDI messages
+ for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
+ void *bptr = (*it)->get_buffer(0);
+ midi_clear(bptr);
+ }
+
_dsp_load = 1.0;
Glib::usleep (100); // don't hog cpu
}
static int instantiate (const std::string& arg1, const std::string& /* arg2 */);
static int deinstantiate ();
static bool already_configured ();
+static bool available ();
static ARDOUR::AudioBackendInfo _descriptor = {
"ALSA",
deinstantiate,
backend_factory,
already_configured,
+ available
};
static boost::shared_ptr<AudioBackend>
return false;
}
+static bool
+available ()
+{
+ return true;
+}
+
extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
{
return &_descriptor;
for (std::vector<AlsaPort*>::const_iterator i = get_connections ().begin ();
i != get_connections ().end ();
++i) {
- const AlsaMidiBuffer src = static_cast<const AlsaMidiPort*>(*i)->const_buffer ();
- for (AlsaMidiBuffer::const_iterator it = src.begin (); it != src.end (); ++it) {
+ const AlsaMidiBuffer * src = static_cast<const AlsaMidiPort*>(*i)->const_buffer ();
+ for (AlsaMidiBuffer::const_iterator it = src->begin (); it != src->end (); ++it) {
(_buffer[_bufperiod]).push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (**it)));
}
}
projects / ardour.git / blobdiff