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alsa-backend: drop midi during freewheel processing.

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This commit is contained in:
Robin Gareus 2014-12-02 17:03:29 +01:00
parent db3d42d551
commit 7aab4be5e4
1 changed files with 29 additions and 5 deletions
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34
libs/backends/alsa/alsa_audiobackend.cc
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@ -1432,7 +1432,7 @@ AlsaAudioBackend::main_process_thread ()
} }
_pcmi->capt_done (_samples_per_period); _pcmi->capt_done (_samples_per_period);
/* de-queue midi*/ /* de-queue incoming midi*/
i = 0; i = 0;
for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) { for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
assert (_rmidi_in.size() > i); assert (_rmidi_in.size() > i);
@ -1459,12 +1459,11 @@ AlsaAudioBackend::main_process_thread ()
return 0; return 0;
} }
i = 0; for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
static_cast<AlsaMidiPort*>(*it)->next_period(); static_cast<AlsaMidiPort*>(*it)->next_period();
} }
/* queue midi */ /* queue outgoing midi */
i = 0; i = 0;
for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) { for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
assert (_rmidi_out.size() > i); assert (_rmidi_out.size() > i);
@ -1504,17 +1503,42 @@ AlsaAudioBackend::main_process_thread ()
} }
} else { } else {
// Freewheelin' // Freewheelin'
// zero audio input buffers
for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) { 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)); 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 (); 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);
} }
if (engine.process_callback (_samples_per_period)) { if (engine.process_callback (_samples_per_period)) {
_pcmi->pcm_stop (); _pcmi->pcm_stop ();
_active = false;
return 0; 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; _dsp_load = 1.0;
Glib::usleep (100); // don't hog cpu Glib::usleep (100); // don't hog cpu
} }