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ALSA Backend: align midi output buffer with n_periods (currently 2)

This commit is contained in:
Robin Gareus 2014-06-08 15:53:15 +02:00
parent eb289a76af
commit b3a44ea32b
2 changed files with 23 additions and 11 deletions
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27
libs/backends/alsa/alsa_audiobackend.cc
View File

@ -470,6 +470,8 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
if (for_latency_measurement) {
_systemic_audio_input_latency = 0;
_systemic_audio_output_latency = 0;
_systemic_midi_input_latency = 0;
_systemic_midi_output_latency = 0;
}
register_system_midi_ports();
@ -528,7 +530,7 @@ int
AlsaAudioBackend::stop ()
{
void *status;
if (!_active) {
if (!_run) {
return 0;
}
@ -1351,14 +1353,19 @@ AlsaAudioBackend::main_process_thread ()
return 0;
}
i = 0;
for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
static_cast<AlsaMidiPort*>(*it)->next_period();
}
/* queue 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();
AlsaRawMidiOut *rm = static_cast<AlsaRawMidiOut*>(_rmidi_out.at(i));
const AlsaMidiBuffer *src = static_cast<const AlsaMidiBuffer*>((*it)->get_buffer(0));
rm->sync_time (clock1); // ?? use clock pre DSP load?
for (AlsaMidiBuffer::const_iterator mit = src->begin (); mit != src->end (); ++mit) {
rm->sync_time (clock1);
for (AlsaMidiBuffer::const_iterator mit = src.begin (); mit != src.end (); ++mit) {
rm->send_event ((*mit)->timestamp(), (*mit)->data(), (*mit)->size());
}
}
@ -1656,8 +1663,10 @@ void* AlsaAudioPort::get_buffer (pframes_t n_samples)
AlsaMidiPort::AlsaMidiPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
: AlsaPort (b, name, flags)
, _bufperiod (0)
{
_buffer.clear ();
_buffer[0].clear ();
_buffer[1].clear ();
}
AlsaMidiPort::~AlsaMidiPort () { }
@ -1671,18 +1680,18 @@ struct MidiEventSorter {
void* AlsaMidiPort::get_buffer (pframes_t /* nframes */)
{
if (is_input ()) {
_buffer.clear ();
(_buffer[_bufperiod]).clear ();
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) {
_buffer.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (**it)));
(_buffer[_bufperiod]).push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (**it)));
}
}
std::sort (_buffer.begin (), _buffer.end (), MidiEventSorter());
std::sort ((_buffer[_bufperiod]).begin (), (_buffer[_bufperiod]).end (), MidiEventSorter());
}
return &_buffer;
return &(_buffer[_bufperiod]);
}
AlsaMidiEvent::AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size)

7
libs/backends/alsa/alsa_audiobackend.h
View File

@ -141,10 +141,13 @@ class AlsaMidiPort : public AlsaPort {
DataType type () const { return DataType::MIDI; };
void* get_buffer (pframes_t nframes);
const AlsaMidiBuffer const_buffer () const { return _buffer; }
const AlsaMidiBuffer const_buffer () const { return _buffer[_bufperiod]; }
void next_period() { get_buffer(0); _bufperiod = (_bufperiod + 1) % 2; }
private:
AlsaMidiBuffer _buffer;
AlsaMidiBuffer _buffer[2];
int _bufperiod;
}; // class AlsaMidiPort
class AlsaAudioBackend : public AudioBackend {