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/*
* Copyright (C) 2019 Paul Davis <paul@linuxaudiosystems.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <iostream>
#include "pbd/malign.h"
#include "pbd/compose.h"
#include "pbd/error.h"
#include "pbd/debug.h"
#include "pbd/stacktrace.h"
#include "ardour/debug.h"
#include "ardour/midi_buffer.h"
#include "ardour/midi_state_tracker.h"
#include "ardour/rt_midibuffer.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
RTMidiBuffer::RTMidiBuffer (size_t capacity)
: _size (0)
, _capacity (0)
, _data (0)
{
if (capacity) {
resize (capacity);
}
}
RTMidiBuffer::~RTMidiBuffer()
{
cache_aligned_free (_data);
}
void
RTMidiBuffer::resize (size_t size)
{
if (_data && size < _capacity) {
if (_size < size) {
/* truncate */
_size = size;
}
return;
}
uint8_t* old_data = _data;
cache_aligned_malloc ((void**) &_data, size);
if (_size) {
memcpy (_data, old_data, _size);
}
cache_aligned_free (old_data);
_capacity = size;
assert(_data);
}
void
RTMidiBuffer::dump (uint32_t cnt)
{
for (Map::iterator iter = _map.begin(); iter != _map.end() && cnt; ++iter, --cnt) {
uint8_t* addr = &_data[iter->second];
TimeType evtime = iter->first;
uint32_t size = *(reinterpret_cast<Evoral::EventType*>(addr));
addr += sizeof (size);
cerr << "@ " << evtime << " sz=" << size << '\t';
cerr << hex;
for (size_t i =0 ; i < size; ++i) {
cerr << "0x" << hex << (int)addr[i] << dec << '/' << (int)addr[i] << ' ';
}
cerr << dec << endl;
}
}
uint32_t
RTMidiBuffer::write (TimeType time, Evoral::EventType /*type*/, uint32_t size, const uint8_t* buf)
{
/* This buffer stores only MIDI, we don't care about the value of "type" */
const size_t bytes_to_merge = sizeof (size) + size;
if (_size + bytes_to_merge > _capacity) {
resize (_capacity + 8192); // XXX 8192 is completely arbitrary
}
_map.insert (make_pair (time, _size));
uint8_t* addr = &_data[_size];
*(reinterpret_cast<uint32_t*>(addr)) = size;
addr += sizeof (size);
memcpy (addr, buf, size);
_size += bytes_to_merge;
return size;
}
uint32_t
RTMidiBuffer::read (MidiBuffer& dst, samplepos_t start, samplepos_t end, MidiStateTracker& tracker, samplecnt_t offset)
{
Map::iterator iter = _map.lower_bound (start);
uint32_t count = 0;
#ifndef NDEBUG
TimeType unadjusted_time;
#endif
DEBUG_TRACE (DEBUG::MidiRingBuffer, string_compose ("read from %1 .. %2\n", start, end));
while ((iter != _map.end()) && (iter->first < end)) {
/* the event consists of a size followed by bytes of MIDI
* data. It begins at _data[iter->second], which was stored in
* our map when we wrote the event into the data structure.
*/
uint8_t* addr = &_data[iter->second];
TimeType evtime = iter->first;
#ifndef NDEBUG
unadjusted_time = evtime;
#endif
uint32_t size = *(reinterpret_cast<Evoral::EventType*>(addr));
addr += sizeof (size);
/* Adjust event times to be relative to 'start', taking
* 'offset' into account.
*/
evtime -= start;
evtime += offset;
uint8_t* write_loc = dst.reserve (evtime, size);
if (write_loc == 0) {
DEBUG_TRACE (DEBUG::MidiRingBuffer, string_compose ("MidiRingBuffer: overflow in destination MIDI buffer, stopped after %1 events, dst size = %2\n", count, dst.size()));
break;
}
DEBUG_TRACE (DEBUG::MidiRingBuffer, string_compose ("read event sz %1 @ %2\n", size, unadjusted_time));
memcpy (write_loc, addr, size);
tracker.track (addr);
++iter;
++count;
}
DEBUG_TRACE (DEBUG::MidiRingBuffer, string_compose ("total events found for %1 .. %2 = %3\n", start, end, count));
return count;
}
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