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/*
Copyright (C) 2006-2008 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 "ardour/midi_ring_buffer.h"
#include "ardour/midi_buffer.h"
#include "ardour/event_type_map.h"
using namespace std;
namespace ARDOUR {
/** Read a block of MIDI events from buffer.
*
* Timestamps of events returned are relative to start (i.e. event with stamp 0
* occurred at start), with offset added.
*/
template<typename T>
size_t
MidiRingBuffer<T>::read(MidiBuffer& dst, nframes_t start, nframes_t end, nframes_t offset)
{
if (this->read_space() == 0) {
return 0;
}
T ev_time;
Evoral::EventType ev_type;
uint32_t ev_size;
size_t count = 0;
//cerr << "MRB read " << start << " .. " << end << " + " << offset << endl;
while (this->read_space() >= sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
this->full_peek(sizeof(T), (uint8_t*)&ev_time);
if (ev_time > end) {
//cerr << "MRB: PAST END (" << ev_time << " : " << end << ")" << endl;
break;
} else if (ev_time < start) {
//cerr << "MRB (start " << start << ") - Skipping event at (too early) time " << ev_time << endl;
break;
}
bool success = read_prefix(&ev_time, &ev_type, &ev_size);
if (!success) {
cerr << "WARNING: error reading event prefix from MIDI ring" << endl;
continue;
}
// This event marks a loop happening. this means that
// the next events timestamp will be non-monotonic.
if (ev_type == LoopEventType) {
ev_time -= start;
ev_time += offset;
Evoral::MIDIEvent<T> loopevent(LoopEventType, ev_time);
dst.push_back(loopevent);
// We can safely return, without reading the data, because
// a LoopEvent does not have data.
return count + 1;
}
uint8_t status;
success = this->full_peek(sizeof(uint8_t), &status);
assert(success); // If this failed, buffer is corrupt, all hope is lost
// Ignore event if it doesn't match channel filter
if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
const uint8_t channel = status & 0x0F;
if ( !(get_channel_mask() & (1L << channel)) ) {
//cerr << "MRB skipping event due to channel mask" << endl;
this->skip(ev_size); // Advance read pointer to next event
continue;
}
}
//cerr << "MRB " << this << " - Reading event, time = "
// << ev_time << " - " << start << " => " << ev_time - start
// << ", size = " << ev_size << endl;
assert(ev_time >= start);
ev_time -= start;
ev_time += offset;
uint8_t* write_loc = dst.reserve(ev_time, ev_size);
if (write_loc == NULL) {
cerr << "MRB: Unable to reserve space in buffer, event skipped";
continue;
}
success = Evoral::EventRingBuffer<T>::full_read(ev_size, write_loc);
if (success) {
if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
}
++count;
//cerr << "MRB - read event at time " << ev_time << endl;
} else {
cerr << "WARNING: error reading event contents from MIDI ring" << endl;
}
}
//cerr << "MTB read space: " << read_space() << endl;
return count;
}
template class MidiRingBuffer<double>;
} // namespace ARDOUR
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