DeckAttributes: Add TrackAttributes for calculating the transition time between tracks

Author: cr7pt0gr4ph7

CMakeLists.txt

@@ -1389,6 +1389,7 @@ add_library(
   src/library/autodj/dlgautodj.cpp
   src/library/autodj/dlgautodj.ui
   src/library/autodj/track/deckattributes.cpp
+  src/library/autodj/track/trackattributes.cpp
   src/library/autodj/track/trackordeckattributes.cpp
   src/library/banshee/bansheedbconnection.cpp
   src/library/banshee/bansheefeature.cpp

src/library/autodj/autodjprocessor.h

@@ -10,6 +10,7 @@
 #include "control/controlpushbutton.h"
 #include "control/pollingcontrolproxy.h"
 #include "library/autodj/track/deckattributes.h"
+#include "library/autodj/track/trackattributes.h"
 #include "library/autodj/track/trackordeckattributes.h"
 #include "library/playlisttablemodel.h"
 #include "preferences/usersettings.h"

src/library/autodj/track/trackattributes.cpp

@@ -0,0 +1,64 @@
+#include "library/autodj/track/trackattributes.h"
+
+#include "moc_trackattributes.cpp"
+#include "track/track.h"
+
+TrackAttributes::TrackAttributes(TrackPointer pTrack)
+        : m_pTrack(pTrack) {
+}
+
+mixxx::audio::FramePos TrackAttributes::introStartPosition() const {
+    auto pIntro = m_pTrack->findCueByType(mixxx::CueType::Intro);
+    if (pIntro) {
+        return pIntro->getPosition();
+    }
+    return mixxx::audio::FramePos();
+}
+
+mixxx::audio::FramePos TrackAttributes::introEndPosition() const {
+    auto pIntro = m_pTrack->findCueByType(mixxx::CueType::Intro);
+    if (pIntro) {
+        return pIntro->getEndPosition();
+    }
+    return mixxx::audio::FramePos();
+}
+
+mixxx::audio::FramePos TrackAttributes::outroStartPosition() const {
+    auto pOutro = m_pTrack->findCueByType(mixxx::CueType::Outro);
+    if (pOutro) {
+        return pOutro->getPosition();
+    }
+    return mixxx::audio::FramePos();
+}
+
+mixxx::audio::FramePos TrackAttributes::outroEndPosition() const {
+    auto pOutro = m_pTrack->findCueByType(mixxx::CueType::Outro);
+    if (pOutro) {
+        return pOutro->getEndPosition();
+    }
+    return mixxx::audio::FramePos();
+}
+
+mixxx::audio::SampleRate TrackAttributes::sampleRate() const {
+    return m_pTrack->getSampleRate();
+}
+
+double TrackAttributes::playPosition() const {
+    return 0.0;
+}
+
+double TrackAttributes::rateRatio() const {
+    return 1.0;
+}
+
+mixxx::audio::FramePos TrackAttributes::trackEndPosition() const {
+    // Instead of actually loading the file, we simply infer
+    // the number of frames from duration and sample rate stored
+    // in the database. This isn't entirely accurate due to
+    // rounding errors, but more than accurate enough for
+    // estimating the remaining play time of the AutoDJ queue.
+    double approxNumSamples =
+            m_pTrack->getSampleRate() * m_pTrack->getDuration();
+
+    return mixxx::audio::FramePos(approxNumSamples);
+}

src/library/autodj/track/trackattributes.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "library/autodj/track/trackordeckattributes.h"
+
+/// Exposes the attributes of a track from the Auto DJ queue.
+class TrackAttributes : public TrackOrDeckAttributes {
+    Q_OBJECT
+  public:
+    TrackAttributes(TrackPointer pTrack);
+
+    virtual mixxx::audio::FramePos introStartPosition() const override;
+    virtual mixxx::audio::FramePos introEndPosition() const override;
+    virtual mixxx::audio::FramePos outroStartPosition() const override;
+    virtual mixxx::audio::FramePos outroEndPosition() const override;
+    virtual mixxx::audio::SampleRate sampleRate() const override;
+    virtual mixxx::audio::FramePos trackEndPosition() const override;
+    virtual double playPosition() const override;
+    virtual double rateRatio() const override;
+
+    TrackPointer getLoadedTrack() const override {
+        return m_pTrack;
+    }
+
+  private:
+    TrackPointer m_pTrack;
+};