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/* This file is part of Evoral.
* Copyright (C) 2008 Dave Robillard <http://drobilla.net>
* Copyright (C) 2000-2008 Paul Davis
* Author: Hans Baier
*
* Evoral 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.
*
* Evoral 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cassert>
#include <iostream>
#include "evoral/Event.hpp"
#include "evoral/SMF.hpp"
#include "libsmf/smf.h"
using namespace std;
namespace Evoral {
template<typename Time>
SMF<Time>::~SMF()
{
if (_smf) {
smf_delete(_smf);
_smf = 0;
_smf_track = 0;
}
}
/** Attempt to open the SMF file for reading and writing.
*
* Currently SMF is always read/write.
*
* \return 0 on success
* -1 if the file can not be opened or created
* -2 if the file exists but specified track does not
*/
template<typename Time>
int
SMF<Time>::open(const std::string& path, bool create, int track) THROW_FILE_ERROR
{
if (_smf) {
smf_delete(_smf);
}
_path = path;
_smf = smf_load(_path.c_str());
if (!_smf) {
if (!create) {
return -1;
}
_smf = smf_new();
if (smf_set_ppqn(_smf, _ppqn) != 0) {
throw FileError();
}
if (_smf == NULL) {
return -1;
}
for (int i = 0; i < track; ++i) {
_smf_track = smf_track_new();
assert(_smf_track);
smf_add_track(_smf, _smf_track);
}
}
_smf_track = smf_get_track_by_number(_smf, track);
if (!_smf_track)
return -2;
cerr << "Track " << track << " # events: " << _smf_track->number_of_events << endl;
_empty = !(_smf_track->number_of_events > 0);
return 0;
}
template<typename Time>
void
SMF<Time>::close() THROW_FILE_ERROR
{
if (_smf) {
if (smf_save(_smf, _path.c_str()) != 0) {
throw FileError();
}
smf_delete(_smf);
_smf = 0;
_smf_track = 0;
}
}
template<typename Time>
void
SMF<Time>::seek_to_start() const
{
smf_rewind(_smf);
}
/** Read an event from the current position in file.
*
* File position MUST be at the beginning of a delta time, or this will die very messily.
* ev.buffer must be of size ev.size, and large enough for the event. The returned event
* will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
* rate given by ppqn() (it is the caller's responsibility to calculate a real time).
*
* \a size should be the capacity of \a buf. If it is not large enough, \a buf will
* be freed and a new buffer allocated in its place, the size of which will be placed
* in size.
*
* Returns event length (including status byte) on success, 0 if event was
* skipped (eg a meta event), or -1 on EOF (or end of track).
*/
template<typename Time>
int
SMF<Time>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
{
smf_event_t *event;
assert(delta_t);
assert(size);
assert(buf);
if ((event = smf_get_next_event(_smf)) != NULL) {
if (smf_event_is_metadata(event)) {
return 0;
}
*delta_t = event->delta_time_pulses;
int event_size = event->midi_buffer_length;
assert(event_size > 0);
// Make sure we have enough scratch buffer
if (*size < (unsigned)event_size) {
*buf = (uint8_t*)realloc(*buf, event_size);
}
memcpy(*buf, event->midi_buffer, size_t(event_size));
*size = event_size;
return event_size;
} else {
return -1;
}
}
template<typename Time>
void
SMF<Time>::append_event_delta(uint32_t delta_t, const Event<Time>& ev)
{
assert(ev.size() > 0);
smf_event_t *event;
event = smf_event_new_from_pointer((void *) ev.buffer(), int(ev.size()));
assert(event != NULL);
memcpy(event->midi_buffer, ev.buffer(), ev.size());
assert(_smf_track);
smf_track_add_event_delta_pulses (_smf_track, event, int(delta_t));
_last_ev_time = ev.time();
if (ev.size() > 0) {
_empty = false;
}
}
template<typename Time>
void
SMF<Time>::begin_write()
{
assert(_smf_track);
smf_track_delete(_smf_track);
_smf_track = smf_track_new();
assert(_smf_track);
smf_add_track(_smf, _smf_track);
assert(_smf->number_of_tracks == 1);
_last_ev_time = 0;
}
template<typename Time>
void
SMF<Time>::end_write() THROW_FILE_ERROR
{
if (smf_save(_smf, _path.c_str()) != 0)
throw FileError();
}
template class SMF<double>;
} // namespace Evoral
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