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// -*- c-basic-offset: 4 -*-
/*
Rosegarden-4
A sequencer and musical notation editor.
This program is Copyright 2000-2005
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
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. See the file
COPYING included with this distribution for more information.
*/
#include "audiopreviewthread.h"
#include "rosedebug.h"
#include "AudioFileManager.h"
#include <qapplication.h>
AudioPreviewThread::AudioPreviewThread(Rosegarden::AudioFileManager *manager) :
m_manager(manager),
m_nextToken(0),
m_exiting(false)
{
}
void
AudioPreviewThread::run()
{
RG_DEBUG << "AudioPreviewThread::run entering" << endl;
while (!m_exiting) {
if (!process()) break;
usleep(300000);
}
RG_DEBUG << "AudioPreviewThread::run exiting" << endl;
}
void
AudioPreviewThread::finish()
{
m_exiting = true;
}
bool
AudioPreviewThread::process()
{
while (!m_queue.empty()) {
int failed = 0;
for (RequestQueue::iterator i = m_queue.begin(); i != m_queue.end(); ++i) {
m_mutex.lock();
// i->first is width, which we use only to provide an ordering to
// ensure we do smaller previews first. We don't use it here.
RequestRec &rec = i->second;
int token = rec.first;
Request req = rec.second;
m_mutex.unlock();
std::vector<float> results;
try {
// Requires thread-safe AudioFileManager::getPreview
results = m_manager->getPreview(req.audioFileId,
req.audioStartTime,
req.audioEndTime,
req.width,
req.showMinima);
} catch (std::string e) {
// RG_DEBUG << "AudioPreviewThread::process: failed to update preview for audio file " << req.audioFileId << ":\n" << e.c_str() << endl;
// OK, we hope this just means we're still recording -- so
// leave this one in the queue
++failed;
continue;
}
m_mutex.lock();
// We need to check that the token is still in the queue
// (i.e. hasn't been cancelled). Otherwise we shouldn't notify
bool found = false;
for (RequestQueue::iterator i = m_queue.begin(); i != m_queue.end(); ++i) {
if (i->second.first == token) {
found = true;
m_queue.erase(i);
break;
}
}
if (found) {
unsigned int channels = m_manager->getAudioFile(req.audioFileId)->getChannels();
m_results[token] = ResultsPair(channels, results);
QObject *notify = req.notify;
QApplication::postEvent
(notify,
new QCustomEvent(QEvent::Type(QEvent::User + 1), (void *)token));
m_mutex.unlock();
break; // start again from start of queue, as iterator
// has been invalidated by erase
}
m_mutex.unlock();
}
if (failed > 0 && failed == m_queue.size()) {
return true; // delay and try again
}
}
return false;
}
int
AudioPreviewThread::requestPreview(const Request &request)
{
m_mutex.lock();
for (RequestQueue::iterator i = m_queue.begin(); i != m_queue.end(); ++i) {
if (i->second.second.notify == request.notify) {
m_queue.erase(i);
break;
}
}
int token = m_nextToken;
m_queue.insert(RequestQueue::value_type(request.width,
RequestRec(token, request)));
++m_nextToken;
m_mutex.unlock();
if (!running()) start();
return token;
}
void
AudioPreviewThread::cancelPreview(int token)
{
m_mutex.lock();
for (RequestQueue::iterator i = m_queue.begin(); i != m_queue.end(); ++i) {
if (i->second.first == token) {
m_queue.erase(i);
break;
}
}
m_mutex.unlock();
}
void
AudioPreviewThread::getPreview(int token, unsigned int &channels,
std::vector<float> &values)
{
m_mutex.lock();
values.clear();
if (m_results.find(token) == m_results.end()) {
channels = 0;
m_mutex.unlock();
return;
}
channels = m_results[token].first;
values = m_results[token].second;
m_results.erase(m_results.find(token));
m_mutex.unlock();
return;
}
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