Initial commit.

src/engine/enginebase.cpp

@@ -0,0 +1,105 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Amarok / Clementine.
+ * Copyright 2003 Mark Kretschmann
+ * Copyright 2004, 2005 Max Howell, <max.howell@methylblue.com>
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ *
+ * Strawberry 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.
+ *
+ * Strawberry 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 "config.h"
+
+#include <cmath>
+#include <QSettings>
+
+#include "enginebase.h"
+#include "enginedevice.h"
+#include "core/timeconstants.h"
+
+#include "settings/playbacksettingspage.h"
+
+Engine::Base::Base()
+    : volume_(50),
+      beginning_nanosec_(0),
+      end_nanosec_(0),
+      scope_(kScopeSize),
+      fadeout_enabled_(true),
+      fadeout_duration_nanosec_(2 * kNsecPerSec),  // 2s
+      crossfade_enabled_(true),
+      autocrossfade_enabled_(false),
+      crossfade_same_album_(false),
+      next_background_stream_id_(0),
+      about_to_end_emitted_(false) {}
+
+Engine::Base::~Base() {}
+
+bool Engine::Base::Load(const QUrl &url, TrackChangeFlags, bool force_stop_at_end, quint64 beginning_nanosec, qint64 end_nanosec) {
+
+  Q_UNUSED(force_stop_at_end);
+
+  url_ = url;
+  beginning_nanosec_ = beginning_nanosec;
+  end_nanosec_ = end_nanosec;
+
+  about_to_end_emitted_ = false;
+  return true;
+
+}
+
+void Engine::Base::SetVolume(uint value) {
+
+  volume_ = value;
+
+  SetVolumeSW(MakeVolumeLogarithmic(value));
+
+}
+
+uint Engine::Base::MakeVolumeLogarithmic(uint volume) {
+  // We're using a logarithmic function to make the volume ramp more natural.
+  return static_cast<uint>( 100 - 100.0 * std::log10( ( 100 - volume ) * 0.09 + 1.0 ) );
+}
+
+void Engine::Base::ReloadSettings() {
+
+  QSettings s;
+  s.beginGroup(PlaybackSettingsPage::kSettingsGroup);
+
+  fadeout_enabled_ = s.value("FadeoutEnabled", false).toBool();
+  fadeout_duration_nanosec_ = s.value("FadeoutDuration", 2000).toLongLong() * kNsecPerMsec;
+  crossfade_enabled_ = s.value("CrossfadeEnabled", false).toBool();
+  autocrossfade_enabled_ = s.value("AutoCrossfadeEnabled", false).toBool();
+  crossfade_same_album_ = !s.value("NoCrossfadeSameAlbum", true).toBool();
+  fadeout_pause_enabled_ = s.value("FadeoutPauseEnabled", false).toBool();
+  fadeout_pause_duration_nanosec_ = s.value("FadeoutPauseDuration", 250).toLongLong() * kNsecPerMsec;
+
+}
+
+void Engine::Base::EmitAboutToEnd() {
+
+  if (about_to_end_emitted_)
+    return;
+
+  about_to_end_emitted_ = true;
+  emit TrackAboutToEnd();
+}
+
+bool Engine::Base::Play(const QUrl &u, TrackChangeFlags c, bool force_stop_at_end, quint64 beginning_nanosec, qint64 end_nanosec) {
+
+  if (!Load(u, c, force_stop_at_end, beginning_nanosec, end_nanosec))
+    return false;
+
+  return Play(0);
+}