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144 lines
3.7 KiB
144 lines
3.7 KiB
/*
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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 <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 <unistd.h>
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#include <errno.h>
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#include <kstddirs.h>
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#include <tqfile.h>
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#include "SequencerMmapper.h"
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#include "misc/Debug.h"
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#include "base/RealTime.h"
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#include "base/Exception.h"
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#include "sound/MappedEvent.h"
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#include "sound/MappedComposition.h"
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namespace Rosegarden
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{
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// Seems not to be properly defined under some gcc 2.95 setups
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#ifndef MREMAP_MAYMOVE
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#define MREMAP_MAYMOVE 1
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#endif
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SequencerMmapper::SequencerMmapper():
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m_fileName(createFileName()),
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m_fd( -1),
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m_mmappedBuffer(0),
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m_mmappedSize(sizeof(SequencerDataBlock))
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{
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// just in case
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TQFile::remove
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(m_fileName);
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m_fd = ::open(m_fileName.latin1(),
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O_RDWR | O_CREAT | O_TRUNC,
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S_IRUSR | S_IWUSR);
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if (m_fd < 0) {
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SEQUENCER_DEBUG << "SequencerMmapper : Couldn't open " << m_fileName
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<< endl;
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throw Exception("Couldn't open " + std::string(m_fileName.ascii()));
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}
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setFileSize(m_mmappedSize);
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//
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// mmap() file for writing
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//
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m_mmappedBuffer = ::mmap(0, m_mmappedSize,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, m_fd, 0);
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if (m_mmappedBuffer == (void*) - 1) {
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SEQUENCER_DEBUG <<
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TQString("mmap failed : (%1) %2\n").arg(errno).arg(strerror(errno));
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throw Exception("mmap failed");
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}
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SEQUENCER_DEBUG << "SequencerMmapper : mmap size : " << m_mmappedSize
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<< " at " << (void*)m_mmappedBuffer << endl;
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// initialise
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init();
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}
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SequencerMmapper::~SequencerMmapper()
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{
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::munmap(m_mmappedBuffer, m_mmappedSize);
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::close(m_fd);
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TQFile::remove
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(m_fileName);
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}
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void
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SequencerMmapper::init()
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{
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SEQUENCER_DEBUG << "SequencerMmapper::init()\n";
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m_sequencerDataBlock = new (m_mmappedBuffer)
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SequencerDataBlock(true);
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::msync(m_mmappedBuffer, m_mmappedSize, MS_ASYNC);
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}
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void
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SequencerMmapper::setFileSize(size_t size)
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{
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SEQUENCER_DEBUG << "SequencerMmapper : setting size of "
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<< m_fileName << " to " << size << endl;
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// rewind
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::lseek(m_fd, 0, SEEK_SET);
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// enlarge the file
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// (seek() to wanted size, then write a byte)
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//
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if (::lseek(m_fd, size - 1, SEEK_SET) == -1) {
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std::cerr << "WARNING: SequencerMmapper : Couldn't lseek in " << m_fileName.ascii()
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<< " to " << size << std::endl;
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throw Exception("lseek failed");
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}
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if (::write(m_fd, "\0", 1) != 1) {
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std::cerr << "WARNING: SequencerMmapper : Couldn't write byte in "
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<< m_fileName.ascii() << std::endl;
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throw Exception("write failed");
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}
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}
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TQString
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SequencerMmapper::createFileName()
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{
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return TDEGlobal::dirs()->resourceDirs("tmp").last() +
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"/rosegarden_sequencer_timing_block";
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}
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}
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