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prepare midi buffer API for midi-delaylines

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This commit is contained in:
Robin Gareus 2014-06-11 12:59:08 +02:00
parent 0400fa64da
commit 33db3c854d
2 changed files with 57 additions and 0 deletions
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51
libs/ardour/midi_buffer.cc
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@ -199,6 +199,57 @@ MidiBuffer::push_back(TimeType time, size_t size, const uint8_t* data)
return true;
}
bool
MidiBuffer::insert_event(const Evoral::MIDIEvent<TimeType>& ev)
{
if (size() == 0) {
return push_back(ev);
}
const size_t stamp_size = sizeof(TimeType);
const size_t bytes_to_merge = stamp_size + ev.size();
if (_size + bytes_to_merge >= _capacity) {
cerr << "MidiBuffer::push_back failed (buffer is full)" << endl;
PBD::stacktrace (cerr, 20);
return false;
}
TimeType t = ev.time();
ssize_t insert_offset = -1;
for (MidiBuffer::iterator m = begin(); m != end(); ++m) {
if ((*m).time() < t) {
continue;
}
if ((*m).time() == t) {
const uint8_t our_midi_status_byte = *(_data + m.offset + sizeof (TimeType));
if (second_simultaneous_midi_byte_is_first (ev.type(), our_midi_status_byte)) {
continue;
}
}
insert_offset = m.offset;
break;
}
if (insert_offset == -1) {
return push_back(ev);
}
// don't use memmove - it may use malloc(!)
// memmove (_data + insert_offset + bytes_to_merge, _data + insert_offset, _size - insert_offset);
for (ssize_t a = _size + bytes_to_merge - 1, b = _size - 1; b >= insert_offset; --b, --a) {
_data[a] = _data[b];
}
uint8_t* const write_loc = _data + insert_offset;
*((TimeType*)write_loc) = t;
memcpy(write_loc + stamp_size, ev.buffer(), ev.size());
_size += bytes_to_merge;
return true;
}
/** Reserve space for a new event in the buffer.
*
* This call is for copying MIDI directly into the buffer, the data location