Chris@87: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@87: 
Chris@87: /*
Chris@87:     Sonic Visualiser
Chris@87:     An audio file viewer and annotation editor.
Chris@87:     Centre for Digital Music, Queen Mary, University of London.
Chris@87:     This file copyright 2006 Chris Cannam.
Chris@87:     
Chris@87:     This program is free software; you can redistribute it and/or
Chris@87:     modify it under the terms of the GNU General Public License as
Chris@87:     published by the Free Software Foundation; either version 2 of the
Chris@87:     License, or (at your option) any later version.  See the file
Chris@87:     COPYING included with this distribution for more information.
Chris@87: */
Chris@87: 
Chris@87: #include "MatrixFileCache.h"
Chris@87: #include "base/TempDirectory.h"
Chris@90: #include "base/System.h"
Chris@87: 
Chris@87: #include <sys/types.h>
Chris@87: #include <sys/stat.h>
Chris@87: #include <fcntl.h>
Chris@87: #include <unistd.h>
Chris@87: 
Chris@87: #include <iostream>
Chris@87: 
Chris@87: #include <cstdio>
Chris@87: 
Chris@87: #include <QFileInfo>
Chris@87: #include <QDir>
Chris@87: 
Chris@91: std::map<QString, int> MatrixFileCache::m_refcount;
Chris@91: QMutex MatrixFileCache::m_refcountMutex;
Chris@91: 
Chris@87: MatrixFileCache::MatrixFileCache(QString fileBase, Mode mode) :
Chris@87:     m_fd(-1),
Chris@87:     m_mode(mode),
Chris@87:     m_width(0),
Chris@87:     m_height(0),
Chris@90:     m_headerSize(2 * sizeof(size_t)),
Chris@95:     m_defaultCacheWidth(2048),
Chris@95:     m_prevX(0),
Chris@95:     m_requestToken(-1)
Chris@87: {
Chris@95:     m_cache.data = 0;
Chris@90: 
Chris@87:     QDir tempDir(TempDirectory::instance()->getPath());
Chris@87:     QString fileName(tempDir.filePath(QString("%1.mfc").arg(fileBase)));
Chris@87:     bool newFile = !QFileInfo(fileName).exists();
Chris@87: 
Chris@87:     if (newFile && mode == ReadOnly) {
Chris@87:         std::cerr << "ERROR: MatrixFileCache::MatrixFileCache: Read-only mode "
Chris@87:                   << "specified, but cache file does not exist" << std::endl;
Chris@87:         return;
Chris@87:     }
Chris@87: 
Chris@87:     int flags = 0;
Chris@87:     mode_t fmode = S_IRUSR | S_IWUSR;
Chris@87: 
Chris@87:     if (mode == ReadWrite) {
Chris@87:         flags = O_RDWR | O_CREAT;
Chris@87:     } else {
Chris@87:         flags = O_RDONLY;
Chris@87:     }
Chris@87: 
Chris@90:     if ((m_fd = ::open(fileName.toLocal8Bit(), flags, fmode)) < 0) {
Chris@87:         ::perror("Open failed");
Chris@87:         std::cerr << "ERROR: MatrixFileCache::MatrixFileCache: "
Chris@87:                   << "Failed to open cache file \""
Chris@87:                   << fileName.toStdString() << "\"";
Chris@87:         if (mode == ReadWrite) std::cerr << " for writing";
Chris@87:         std::cerr << std::endl;
Chris@91:         return;
Chris@87:     }
Chris@87: 
Chris@87:     if (newFile) {
Chris@87:         resize(0, 0); // write header
Chris@87:     } else {
Chris@87:         size_t header[2];
Chris@90:         if (::read(m_fd, header, 2 * sizeof(size_t)) < 0) {
Chris@87:             perror("Read failed");
Chris@87:             std::cerr << "ERROR: MatrixFileCache::MatrixFileCache: "
Chris@90:                       << "Failed to read header (fd " << m_fd << ", file \""
Chris@90:                       << fileName.toStdString() << "\")" << std::endl;
Chris@87:             return;
Chris@87:         }
Chris@87:         m_width = header[0];
Chris@87:         m_height = header[1];
Chris@87:         seekTo(0, 0);
Chris@87:     }
Chris@87: 
Chris@91:     m_fileName = fileName;
Chris@95:     
Chris@95:     //!!! why isn't this signal being delivered?
Chris@95:     connect(&m_readThread, SIGNAL(cancelled(int)), 
Chris@95:             this, SLOT(requestCancelled(int)));
Chris@95: 
Chris@95:     m_readThread.start();
Chris@95: 
Chris@91:     QMutexLocker locker(&m_refcountMutex);
Chris@91:     ++m_refcount[fileName];
Chris@91: 
Chris@90:     std::cerr << "MatrixFileCache::MatrixFileCache: Done, size is " << "(" << m_width << ", " << m_height << ")" << std::endl;
Chris@87: 
Chris@87: }
Chris@87: 
Chris@87: MatrixFileCache::~MatrixFileCache()
Chris@87: {
Chris@95:     float *requestData = 0;
Chris@95: 
Chris@95:     if (m_requestToken >= 0) {
Chris@95:         FileReadThread::Request request;
Chris@95:         if (m_readThread.getRequest(m_requestToken, request)) {
Chris@95:             requestData = (float *)request.data;
Chris@95:         }
Chris@90:     }
Chris@90: 
Chris@95:     m_readThread.finish();
Chris@95:     m_readThread.wait();
Chris@95: 
Chris@95:     if (requestData) delete[] requestData;
Chris@95:     if (m_cache.data) delete[] m_cache.data;
Chris@95: 
Chris@87:     if (m_fd >= 0) {
Chris@87:         if (::close(m_fd) < 0) {
Chris@87:             ::perror("MatrixFileCache::~MatrixFileCache: close failed");
Chris@87:         }
Chris@87:     }
Chris@90: 
Chris@91:     if (m_fileName != "") {
Chris@91:         QMutexLocker locker(&m_refcountMutex);
Chris@91:         if (--m_refcount[m_fileName] == 0) {
Chris@95:             if (::unlink(m_fileName.toLocal8Bit())) {
Chris@95:                 ::perror("Unlink failed");
Chris@91:                 std::cerr << "WARNING: MatrixFileCache::~MatrixFileCache: reference count reached 0, but failed to unlink file \"" << m_fileName.toStdString() << "\"" << std::endl;
Chris@91:             } else {
Chris@91:                 std::cerr << "deleted " << m_fileName.toStdString() << std::endl;
Chris@91:             }
Chris@91:         }
Chris@91:     }
Chris@87: }
Chris@87: 
Chris@87: size_t 
Chris@87: MatrixFileCache::getWidth() const
Chris@87: {
Chris@87:     return m_width;
Chris@87: }
Chris@87: 
Chris@87: size_t
Chris@87: MatrixFileCache::getHeight() const
Chris@87: {
Chris@87:     return m_height;
Chris@87: }
Chris@87: 
Chris@87: void
Chris@87: MatrixFileCache::resize(size_t w, size_t h)
Chris@87: {
Chris@87:     if (m_mode != ReadWrite) {
Chris@87:         std::cerr << "ERROR: MatrixFileCache::resize called on read-only cache"
Chris@87:                   << std::endl;
Chris@87:         return;
Chris@87:     }
Chris@87: 
Chris@95:     QMutexLocker locker(&m_fdMutex);
Chris@95:     
Chris@87:     off_t off = m_headerSize + (w * h * sizeof(float));
Chris@87: 
Chris@87:     if (w * h > m_width * m_height) {
Chris@87: 
Chris@95:         if (::lseek(m_fd, off - sizeof(float), SEEK_SET) == (off_t)-1) {
Chris@95:             ::perror("Seek failed");
Chris@95:             std::cerr << "ERROR: MatrixFileCache::resize(" << w << ", "
Chris@95:                       << h << "): seek failed, cannot resize" << std::endl;
Chris@95:             return;
Chris@95:         }
Chris@95:             
Chris@95:         // guess this requires efficient support for sparse files
Chris@90:         
Chris@95:         float f(0);
Chris@95:         if (::write(m_fd, &f, sizeof(float)) != sizeof(float)) {
Chris@95:             ::perror("WARNING: MatrixFileCache::resize: write failed");
Chris@87:         }
Chris@95: 
Chris@87:     } else {
Chris@87:         
Chris@87:         if (::ftruncate(m_fd, off) < 0) {
Chris@90:             ::perror("WARNING: MatrixFileCache::resize: ftruncate failed");
Chris@87:         }
Chris@87:     }
Chris@87: 
Chris@87:     m_width = 0;
Chris@87:     m_height = 0;
Chris@87: 
Chris@87:     if (::lseek(m_fd, 0, SEEK_SET) == (off_t)-1) {
Chris@87:         ::perror("ERROR: MatrixFileCache::resize: Seek to write header failed");
Chris@87:         return;
Chris@87:     }
Chris@87: 
Chris@87:     size_t header[2];
Chris@87:     header[0] = w;
Chris@87:     header[1] = h;
Chris@87:     if (::write(m_fd, header, 2 * sizeof(size_t)) != 2 * sizeof(size_t)) {
Chris@87:         ::perror("ERROR: MatrixFileCache::resize: Failed to write header");
Chris@87:         return;
Chris@87:     }
Chris@87: 
Chris@87:     m_width = w;
Chris@87:     m_height = h;
Chris@87: 
Chris@87:     seekTo(0, 0);
Chris@87: }
Chris@87: 
Chris@87: void
Chris@87: MatrixFileCache::reset()
Chris@87: {
Chris@87:     if (m_mode != ReadWrite) {
Chris@87:         std::cerr << "ERROR: MatrixFileCache::reset called on read-only cache"
Chris@87:                   << std::endl;
Chris@87:         return;
Chris@87:     }
Chris@87:     
Chris@95:     QMutexLocker locker(&m_fdMutex);
Chris@95: 
Chris@90:     float *emptyCol = new float[m_height];
Chris@90:     for (size_t y = 0; y < m_height; ++y) emptyCol[y] = 0.f;
Chris@90: 
Chris@90:     seekTo(0, 0);
Chris@90:     for (size_t x = 0; x < m_width; ++x) setColumnAt(x, emptyCol);
Chris@90:     
Chris@90:     delete[] emptyCol;
Chris@87: }
Chris@87: 
Chris@95: float
Chris@95: MatrixFileCache::getValueAt(size_t x, size_t y)
Chris@87: {
Chris@95:     float value = 0.f;
Chris@95:     if (getValuesFromCache(x, y, 1, &value)) return value;
Chris@90: 
Chris@95:     ssize_t r = 0;
Chris@87: 
Chris@95: //    std::cout << "MatrixFileCache::getValueAt(" << x << ", " << y << ")"
Chris@95: //              << ": reading the slow way" << std::endl;
Chris@95: 
Chris@95:     m_fdMutex.lock();
Chris@95: 
Chris@95:     if (seekTo(x, y)) {
Chris@95:         r = ::read(m_fd, &value, sizeof(float));
Chris@87:     }
Chris@87: 
Chris@95:     m_fdMutex.unlock();
Chris@95: 
Chris@91:     if (r < 0) {
Chris@91:         ::perror("MatrixFileCache::getValueAt: Read failed");
Chris@91:     }
Chris@90:     if (r != sizeof(float)) {
Chris@90:         value = 0.f;
Chris@87:     }
Chris@95: 
Chris@87:     return value;
Chris@87: }
Chris@87: 
Chris@87: void
Chris@95: MatrixFileCache::getColumnAt(size_t x, float *values)
Chris@87: {
Chris@95:     if (getValuesFromCache(x, 0, m_height, values)) return;
Chris@95: 
Chris@95:     ssize_t r = 0;
Chris@95: 
Chris@95:     std::cout << "MatrixFileCache::getColumnAt(" << x << ")"
Chris@95:               << ": reading the slow way" << std::endl;
Chris@95: 
Chris@95:     m_fdMutex.lock();
Chris@95: 
Chris@95:     if (seekTo(x, 0)) {
Chris@95:         r = ::read(m_fd, values, m_height * sizeof(float));
Chris@87:     }
Chris@87: 
Chris@95:     m_fdMutex.unlock();
Chris@95:     
Chris@91:     if (r < 0) {
Chris@87:         ::perror("MatrixFileCache::getColumnAt: read failed");
Chris@87:     }
Chris@95: }
Chris@95: 
Chris@95: bool
Chris@95: MatrixFileCache::getValuesFromCache(size_t x, size_t ystart, size_t ycount,
Chris@95:                                     float *values)
Chris@95: {
Chris@95:     m_cacheMutex.lock();
Chris@95: 
Chris@95:     if (!m_cache.data || x < m_cache.x || x >= m_cache.x + m_cache.width) {
Chris@95:         bool left = (m_cache.data && x < m_cache.x);
Chris@95:         m_cacheMutex.unlock();
Chris@95:         primeCache(x, left); // this doesn't take effect until a later callback
Chris@95:         m_prevX = x;
Chris@95:         return false;
Chris@95:     }
Chris@95: 
Chris@95:     for (size_t y = ystart; y < ystart + ycount; ++y) {
Chris@95:         values[y - ystart] = m_cache.data[(x - m_cache.x) * m_height + y];
Chris@95:     }
Chris@95:     m_cacheMutex.unlock();
Chris@95: 
Chris@95:     if (m_cache.x > 0 && x < m_prevX && x < m_cache.x + m_cache.width/4) {
Chris@95:         primeCache(x, true);
Chris@95:     }
Chris@95: 
Chris@95:     if (m_cache.x + m_cache.width < m_width &&
Chris@95:         x > m_prevX &&
Chris@95:         x > m_cache.x + (m_cache.width * 3) / 4) {
Chris@95:         primeCache(x, false);
Chris@95:     }
Chris@95: 
Chris@95:     m_prevX = x;
Chris@95:     return true;
Chris@87: }
Chris@87: 
Chris@87: void
Chris@87: MatrixFileCache::setValueAt(size_t x, size_t y, float value)
Chris@87: {
Chris@87:     if (m_mode != ReadWrite) {
Chris@87:         std::cerr << "ERROR: MatrixFileCache::setValueAt called on read-only cache"
Chris@87:                   << std::endl;
Chris@87:         return;
Chris@87:     }
Chris@87: 
Chris@95:     ssize_t w = 0;
Chris@95:     bool seekFailed = false;
Chris@95: 
Chris@95:     m_fdMutex.lock();
Chris@95: 
Chris@95:     if (seekTo(x, y)) {
Chris@95:         w = ::write(m_fd, &value, sizeof(float));
Chris@95:     } else {
Chris@95:         seekFailed = true;
Chris@95:     }
Chris@95: 
Chris@95:     m_fdMutex.unlock();
Chris@95: 
Chris@95:     if (!seekFailed && w != sizeof(float)) {
Chris@87:         ::perror("WARNING: MatrixFileCache::setValueAt: write failed");
Chris@87:     }
Chris@87: 
Chris@95:     //... update cache as appropriate
Chris@87: }
Chris@87: 
Chris@87: void
Chris@87: MatrixFileCache::setColumnAt(size_t x, float *values)
Chris@87: {
Chris@87:     if (m_mode != ReadWrite) {
Chris@87:         std::cerr << "ERROR: MatrixFileCache::setColumnAt called on read-only cache"
Chris@87:                   << std::endl;
Chris@87:         return;
Chris@87:     }
Chris@87: 
Chris@95:     ssize_t w = 0;
Chris@95:     bool seekFailed = false;
Chris@95: 
Chris@95:     m_fdMutex.lock();
Chris@95: 
Chris@95:     if (seekTo(x, 0)) {
Chris@95:         w = ::write(m_fd, values, m_height * sizeof(float));
Chris@95:     } else {
Chris@95:         seekFailed = true;
Chris@95:     }
Chris@95: 
Chris@95:     m_fdMutex.unlock();
Chris@95: 
Chris@95:     if (!seekFailed && w != ssize_t(m_height * sizeof(float))) {
Chris@87:         ::perror("WARNING: MatrixFileCache::setColumnAt: write failed");
Chris@87:     }
Chris@87: 
Chris@95:     //... update cache as appropriate
Chris@90: }
Chris@90: 
Chris@95: void
Chris@95: MatrixFileCache::primeCache(size_t x, bool goingLeft)
Chris@90: {
Chris@95: //    std::cerr << "MatrixFileCache::primeCache(" << x << ", " << goingLeft << ")" << std::endl;
Chris@90: 
Chris@95:     size_t rx = x;
Chris@95:     size_t rw = m_defaultCacheWidth;
Chris@90: 
Chris@95:     size_t left = rw / 3;
Chris@95:     if (goingLeft) left = (rw * 2) / 3;
Chris@95: 
Chris@95:     if (rx > left) rx -= left;
Chris@95:     else rx = 0;
Chris@95: 
Chris@95:     if (rx + rw > m_width) rw = m_width - rx;
Chris@95: 
Chris@95:     QMutexLocker locker(&m_cacheMutex);
Chris@95: 
Chris@95:     if (m_requestToken >= 0) {
Chris@95: 
Chris@95:         if (x >= m_requestingX &&
Chris@95:             x <  m_requestingX + m_requestingWidth) {
Chris@95: 
Chris@95:             if (m_readThread.isReady(m_requestToken)) {
Chris@95: 
Chris@95:                 std::cerr << "last request is ready! (" << m_requestingX << ", "<< m_requestingWidth << ")"  << std::endl;
Chris@95: 
Chris@95:                 FileReadThread::Request request;
Chris@95:                 if (m_readThread.getRequest(m_requestToken, request)) {
Chris@95: 
Chris@95:                     m_cache.x = (request.start - m_headerSize) / (m_height * sizeof(float));
Chris@95:                     m_cache.width = request.size / (m_height * sizeof(float));
Chris@95:                     
Chris@95:                     std::cerr << "actual: " << m_cache.x << ", " << m_cache.width << std::endl;
Chris@95: 
Chris@95:                     if (m_cache.data) delete[] m_cache.data;
Chris@95:                     m_cache.data = (float *)request.data;
Chris@95:                 }
Chris@95:                 
Chris@95:                 m_readThread.done(m_requestToken);
Chris@95:                 m_requestToken = -1;
Chris@95:             }
Chris@95: 
Chris@95:             return;
Chris@95:         }
Chris@95: 
Chris@95:         std::cerr << "cancelling last request" << std::endl;
Chris@95:         m_readThread.cancel(m_requestToken);
Chris@95: //!!!
Chris@95:         m_requestToken = -1;
Chris@95:     }
Chris@95: 
Chris@95:     FileReadThread::Request request;
Chris@95:     request.fd = m_fd;
Chris@95:     request.mutex = &m_fdMutex;
Chris@95:     request.start = m_headerSize + rx * m_height * sizeof(float);
Chris@95:     request.size = rw * m_height * sizeof(float);
Chris@95:     request.data = (char *)(new float[rw * m_height]);
Chris@95: 
Chris@95:     m_requestingX = rx;
Chris@95:     m_requestingWidth = rw;
Chris@95: 
Chris@95:     int token = m_readThread.request(request);
Chris@95:     std::cerr << "MatrixFileCache::primeCache: request token is "
Chris@95:               << token << std::endl;
Chris@95: 
Chris@95:     m_requestToken = token;
Chris@95: }
Chris@95: 
Chris@95: void
Chris@95: MatrixFileCache::requestCancelled(int token)
Chris@95: {
Chris@95:     std::cerr << "MatrixFileCache::requestCancelled(" << token << ")" << std::endl;
Chris@95: 
Chris@95:     FileReadThread::Request request;
Chris@95:     if (m_readThread.getRequest(token, request)) {
Chris@95:         delete[] ((float *)request.data);
Chris@95:         m_readThread.done(token);
Chris@95:     }
Chris@90: }
Chris@90: 
Chris@90: bool
Chris@95: MatrixFileCache::seekTo(size_t x, size_t y)
Chris@87: {
Chris@87:     off_t off = m_headerSize + (x * m_height + y) * sizeof(float);
Chris@90: 
Chris@87:     if (::lseek(m_fd, off, SEEK_SET) == (off_t)-1) {
Chris@87:         ::perror("Seek failed");
Chris@87:         std::cerr << "ERROR: MatrixFileCache::seekTo(" << x << ", " << y
Chris@87:                   << ") failed" << std::endl;
Chris@87:         return false;
Chris@87:     }
Chris@87: 
Chris@87:     return true;
Chris@87: }
Chris@87: