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106 lines
2.8 KiB
106 lines
2.8 KiB
15 years ago
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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Rosegarden
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A MIDI and audio sequencer and musical notation editor.
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This program is Copyright 2000-2008
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Guillaume Laurent <glaurent@telegraph-road.org>,
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Chris Cannam <cannam@all-day-breakfast.com>,
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Richard Bown <richard.bown@ferventsoftware.com>
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The moral rights of Guillaume Laurent, Chris Cannam, and Richard
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Bown to claim authorship of this work have been asserted.
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Other copyrights also apply to some parts of this work. Please
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see the AUTHORS file and individual file headers for details.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#include "SequencerMapper.h"
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#include "misc/Debug.h"
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#include "base/Exception.h"
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#include "base/MidiProgram.h"
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#include "base/RealTime.h"
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#include "base/Track.h"
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#include "sound/MappedComposition.h"
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#include "sound/MappedEvent.h"
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#include "sound/SequencerDataBlock.h"
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#include <qfileinfo.h>
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#include <qstring.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <errno.h>
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namespace Rosegarden
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{
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SequencerMapper::SequencerMapper(const QString filename)
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: m_fd( -1),
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m_mmappedSize(0),
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m_mmappedBuffer((void *)0),
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m_filename(filename)
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{
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RG_DEBUG << "SequencerMapper::SequencerMapper - mmapping " << filename << endl;
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map();
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}
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SequencerMapper::~SequencerMapper()
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{
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unmap();
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}
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void
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SequencerMapper::map()
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{
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QFileInfo fInfo(m_filename);
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if (!fInfo.exists()) {
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RG_DEBUG << "SequencerMapper::map() : file " << m_filename << " doesn't exist\n";
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throw Exception("file not found");
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}
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m_fd = ::open(m_filename.latin1(), O_RDWR);
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if (m_fd < 0) {
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RG_DEBUG << "SequencerMapper::map() : Couldn't open " << m_filename
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<< endl;
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throw Exception("Couldn't open " + std::string(m_filename.data()));
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}
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m_mmappedSize = sizeof(SequencerDataBlock);
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m_mmappedBuffer = (long*)::mmap(0, m_mmappedSize, PROT_READ, MAP_SHARED, m_fd, 0);
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if (m_mmappedBuffer == (void*) - 1) {
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RG_DEBUG << QString("mmap failed : (%1) %2\n").
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arg(errno).arg(strerror(errno));
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throw Exception("mmap failed");
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}
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RG_DEBUG << "SequencerMapper::map() : "
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<< (void*)m_mmappedBuffer << "," << m_mmappedSize << endl;
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m_sequencerDataBlock = new (m_mmappedBuffer)
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SequencerDataBlock(false);
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}
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void
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SequencerMapper::unmap()
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{
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::munmap(m_mmappedBuffer, m_mmappedSize);
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::close(m_fd);
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}
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}
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