Clementine-audio-player-Mac.../ext/libclementine-tagreader/cloudstream.cpp

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/* This file is part of Clementine.
Copyright 2012, David Sansome <me@davidsansome.com>
Clementine 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 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include "cloudstream.h"
#include <QEventLoop>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <taglib/id3v2framefactory.h>
#include <taglib/mpegfile.h>
#include "core/logging.h"
namespace {
static const int kTaglibPrefixCacheBytes = 64 * 1024; // Should be enough.
static const int kTaglibSuffixCacheBytes = 8 * 1024;
}
CloudStream::CloudStream(const QUrl& url, const QString& filename,
const long length, const QString& auth,
QNetworkAccessManager* network)
: url_(url),
filename_(filename),
encoded_filename_(filename_.toUtf8()),
length_(length),
auth_(auth),
cursor_(0),
network_(network),
cache_(length),
num_requests_(0) {}
TagLib::FileName CloudStream::name() const { return encoded_filename_.data(); }
bool CloudStream::CheckCache(int start, int end) {
for (int i = start; i <= end; ++i) {
if (!cache_.test(i)) {
return false;
}
}
return true;
}
void CloudStream::FillCache(int start, TagLib::ByteVector data) {
for (int i = 0; i < data.size(); ++i) {
cache_.set(start + i, data[i]);
}
}
TagLib::ByteVector CloudStream::GetCached(int start, int end) {
const uint size = end - start + 1;
TagLib::ByteVector ret(size);
for (int i = 0; i < size; ++i) {
ret[i] = cache_.get(start + i);
}
return ret;
}
void CloudStream::Precache() {
// For reading the tags of an MP3, TagLib tends to request:
// 1. The first 1024 bytes
// 2. Somewhere between the first 2KB and first 60KB
// 3. The last KB or two.
// 4. Somewhere in the first 64KB again
//
// OGG Vorbis may read the last 4KB.
//
// So, if we precache the first 64KB and the last 8KB we should be sorted :-)
// Ideally, we would use bytes=0-655364,-8096 but Google Drive does not seem
// to support multipart byte ranges yet so we have to make do with two
// requests.
seek(0, TagLib::IOStream::Beginning);
readBlock(kTaglibPrefixCacheBytes);
seek(kTaglibSuffixCacheBytes, TagLib::IOStream::End);
readBlock(kTaglibSuffixCacheBytes);
clear();
}
TagLib::ByteVector CloudStream::readBlock(ulong length) {
const uint start = cursor_;
const uint end = qMin(cursor_ + length - 1, length_ - 1);
if (end < start) {
return TagLib::ByteVector();
}
if (CheckCache(start, end)) {
TagLib::ByteVector cached = GetCached(start, end);
cursor_ += cached.size();
return cached;
}
QNetworkRequest request = QNetworkRequest(url_);
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if (!auth_.isEmpty()) {
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request.setRawHeader("Authorization", auth_.toUtf8());
}
request.setRawHeader("Range",
QString("bytes=%1-%2").arg(start).arg(end).toUtf8());
request.setAttribute(QNetworkRequest::CacheLoadControlAttribute,
QNetworkRequest::AlwaysNetwork);
// The Ubuntu One server applies the byte range to the gzipped data, rather
// than the raw data so we must disable compression.
if (url_.host() == "files.one.ubuntu.com") {
request.setRawHeader("Accept-Encoding", "identity");
}
QNetworkReply* reply = network_->get(request);
connect(reply, SIGNAL(sslErrors(QList<QSslError>)),
SLOT(SSLErrors(QList<QSslError>)));
++num_requests_;
QEventLoop loop;
QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
loop.exec();
reply->deleteLater();
int code = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
if (code >= 400) {
qLog(Debug) << "Error retrieving url to tag:" << url_;
return TagLib::ByteVector();
}
QByteArray data = reply->readAll();
TagLib::ByteVector bytes(data.data(), data.size());
cursor_ += data.size();
FillCache(start, bytes);
return bytes;
}
void CloudStream::writeBlock(const TagLib::ByteVector&) {
qLog(Debug) << Q_FUNC_INFO << "not implemented";
}
void CloudStream::insert(const TagLib::ByteVector&, ulong, ulong) {
qLog(Debug) << Q_FUNC_INFO << "not implemented";
}
void CloudStream::removeBlock(ulong, ulong) {
qLog(Debug) << Q_FUNC_INFO << "not implemented";
}
bool CloudStream::readOnly() const {
qLog(Debug) << Q_FUNC_INFO;
return true;
}
bool CloudStream::isOpen() const { return true; }
void CloudStream::seek(long offset, TagLib::IOStream::Position p) {
switch (p) {
case TagLib::IOStream::Beginning:
cursor_ = offset;
break;
case TagLib::IOStream::Current:
cursor_ = qMin(ulong(cursor_ + offset), length_);
break;
case TagLib::IOStream::End:
// This should really not have qAbs(), but OGG reading needs it.
cursor_ = qMax(0UL, length_ - qAbs(offset));
break;
}
}
void CloudStream::clear() { cursor_ = 0; }
long CloudStream::tell() const { return cursor_; }
long CloudStream::length() { return length_; }
void CloudStream::truncate(long) {
qLog(Debug) << Q_FUNC_INFO << "not implemented";
}
void CloudStream::SSLErrors(const QList<QSslError>& errors) {
for (const QSslError& error : errors) {
qLog(Debug) << error.error() << error.errorString();
qLog(Debug) << error.certificate();
}
}