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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qsamplecache_p.h"
#include <QtConcurrent/qtconcurrentrun.h>
#include <QtCore/qcoreapplication.h>
#include <QtCore/qdebug.h>
#include <QtCore/qeventloop.h>
#include <QtCore/qfile.h>
#include <QtCore/qfuturewatcher.h>
#include <QtCore/qloggingcategory.h>
#if QT_CONFIG(network)
# include <QtNetwork/qnetworkaccessmanager.h>
# include <QtNetwork/qnetworkreply.h>
# include <QtNetwork/qnetworkrequest.h>
#endif
#include "dr_wav.h"
#include <utility>
Q_STATIC_LOGGING_CATEGORY(qLcSampleCache, "qt.multimedia.samplecache")
QT_BEGIN_NAMESPACE
QSampleCache::QSampleCache(QObject *parent)
: QObject(parent)
{
#if QT_CONFIG(thread)
// we limit the number of loader threads to avoid thread explosion
static constexpr int loaderThreadLimit = 8;
m_threadPool.setMaxThreadCount(loaderThreadLimit);
m_threadPool.setExpiryTimeout(15);
m_threadPool.setThreadPriority(QThread::LowPriority);
m_threadPool.setServiceLevel(QThread::QualityOfService::Eco);
if (!thread()->isMainThread()) {
this->moveToThread(qApp->thread());
m_threadPool.moveToThread(qApp->thread());
}
#endif
}
QSampleCache::~QSampleCache()
{
m_threadPool.clear();
m_threadPool.waitForDone();
for (auto &entry : m_loadedSamples) {
auto samplePtr = entry.second.lock();
if (samplePtr)
samplePtr->clearParent();
}
for (auto &entry : m_pendingSamples) {
auto samplePtr = entry.second.first;
if (samplePtr)
samplePtr->clearParent();
}
}
QSampleCache::SampleLoadResult QSampleCache::loadSample(QByteArray data)
{
using namespace QtPrivate;
drwav wavParser;
bool success = drwav_init_memory(&wavParser, data.constData(), data.size(), nullptr);
if (!success)
return std::nullopt;
// using float as internal format. one could argue to use int16 and save half the ram at the
// cost of potential run-time conversions
QAudioFormat audioFormat;
audioFormat.setChannelCount(wavParser.channels);
audioFormat.setSampleFormat(QAudioFormat::Float);
audioFormat.setSampleRate(wavParser.sampleRate);
audioFormat.setChannelConfig(
QAudioFormat::defaultChannelConfigForChannelCount(wavParser.channels));
QByteArray sampleData;
sampleData.resizeForOverwrite(sizeof(float) * wavParser.channels
* wavParser.totalPCMFrameCount);
uint64_t framesRead = drwav_read_pcm_frames_f32(&wavParser, wavParser.totalPCMFrameCount,
reinterpret_cast<float *>(sampleData.data()));
if (framesRead != wavParser.totalPCMFrameCount)
return std::nullopt;
return std::pair{
std::move(sampleData),
audioFormat,
};
}
#if QT_CONFIG(thread)
QSampleCache::SampleLoadResult
QSampleCache::loadSample(const QUrl &url, std::optional<SampleSourceType> forceSourceType)
{
using namespace Qt::Literals;
bool errorOccurred = false;
if (url.scheme().isEmpty())
// exit early, to avoid QNetworkAccessManager trying to construct a default ssl
// configuration, which tends to cause timeouts on CI on macos.
// catch this case and exit early.
return std::nullopt;
std::unique_ptr<QIODevice> decoderInput;
SampleSourceType realSourceType =
forceSourceType.value_or(url.scheme() == u"qrc"_s || url.scheme() == u"file"_s
? SampleSourceType::File
: SampleSourceType::NetworkManager);
if (realSourceType == SampleSourceType::File) {
QString locationString =
url.isLocalFile() ? url.toLocalFile() : u":" + url.toString(QUrl::RemoveScheme);
auto *file = new QFile(locationString);
bool opened = file->open(QFile::ReadOnly);
if (!opened)
errorOccurred = true;
decoderInput.reset(file);
} else {
#if QT_CONFIG(network)
thread_local static QNetworkAccessManager networkAccessManager;
QNetworkReply *reply = networkAccessManager.get(QNetworkRequest(url));
if (reply->error() != QNetworkReply::NoError)
errorOccurred = true;
connect(reply, &QNetworkReply::errorOccurred, reply,
[&]([[maybe_unused]] QNetworkReply::NetworkError errorCode) {
errorOccurred = true;
});
decoderInput.reset(reply);
#else
return std::nullopt;
#endif
}
if (!decoderInput->isOpen())
return std::nullopt;
QByteArray data = decoderInput->readAll();
if (data.isEmpty() || errorOccurred)
return std::nullopt;
return loadSample(std::move(data));
}
#endif
bool QSampleCache::isCached(const QUrl &url) const
{
std::lock_guard guard(m_mutex);
return m_loadedSamples.find(url) != m_loadedSamples.end()
|| m_pendingSamples.find(url) != m_pendingSamples.end();
}
QFuture<SharedSamplePtr> QSampleCache::requestSampleFuture(const QUrl &url)
{
std::lock_guard guard(m_mutex);
auto promise = std::make_shared<QPromise<SharedSamplePtr>>();
auto future = promise->future();
// found and ready
auto found = m_loadedSamples.find(url);
if (found != m_loadedSamples.end()) {
SharedSamplePtr foundSample = found->second.lock();
Q_ASSERT(foundSample);
Q_ASSERT(foundSample->state() == QSample::Ready);
promise->start();
promise->addResult(std::move(foundSample));
promise->finish();
return future;
}
// already in the process of being loaded
auto pending = m_pendingSamples.find(url);
if (pending != m_pendingSamples.end()) {
pending->second.second.append(promise);
return future;
}
// we need to start a new load process
SharedSamplePtr sample = std::make_shared<QSample>(url, this);
m_pendingSamples.emplace(url, std::pair{ sample, QList<SharedSamplePromise>{ promise } });
#if QT_CONFIG(thread)
QFuture<SampleLoadResult> futureResult =
QtConcurrent::run(&m_threadPool, [url, type = m_sampleSourceType] {
return loadSample(url, type);
});
#else
// TODO: for now we require threads
QPromise<SampleLoadResult> brokenPromise;
brokenPromise.start();
brokenPromise.addResult(std::nullopt);
brokenPromise.finish();
QFuture<SampleLoadResult> futureResult = brokenPromise.future();
#endif
futureResult.then(this,
[this, url, sample = std::move(sample)](SampleLoadResult loadResult) mutable {
if (loadResult)
sample->setData(loadResult->first, loadResult->second);
else
sample->setError();
std::lock_guard guard(m_mutex);
auto pending = m_pendingSamples.find(url);
if (pending != m_pendingSamples.end()) {
for (auto &promise : pending->second.second) {
promise->start();
promise->addResult(loadResult ? sample : nullptr);
promise->finish();
}
}
if (loadResult)
m_loadedSamples.emplace(url, sample);
if (pending != m_pendingSamples.end())
m_pendingSamples.erase(pending);
sample = {};
});
return future;
}
QSample::~QSample()
{
// Remove ourselves from our parent
if (m_parent)
m_parent->removeUnreferencedSample(m_url);
qCDebug(qLcSampleCache) << "~QSample" << this << ": deleted [" << m_url << "]" << QThread::currentThread();
}
void QSampleCache::removeUnreferencedSample(const QUrl &url)
{
std::lock_guard guard(m_mutex);
m_loadedSamples.erase(url);
}
void QSample::setError()
{
m_state = State::Error;
}
void QSample::setData(QByteArray data, QAudioFormat format)
{
m_state = State::Ready;
m_soundData = std::move(data);
m_audioFormat = format;
}
QSample::State QSample::state() const
{
return m_state;
}
QSample::QSample(QUrl url, QSampleCache *parent) : m_parent(parent), m_url(std::move(url)) { }
void QSample::clearParent()
{
m_parent = nullptr;
}
QT_END_NAMESPACE
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