LibWeb: Play audio tracks alongside video tracks with the video element

The underlying media element class already parses out the audio tracks,
regardless of the media type. Let's play them with videos!

Libraries/LibWeb/HTML/AudioTrack.cpp

@@ -60,12 +60,12 @@ void AudioTrack::initialize(JS::Realm& realm)
     m_id = String::number(id);
 }
 
-void AudioTrack::play(Badge<HTMLAudioElement>)
+void AudioTrack::play()
 {
     m_audio_plugin->resume_playback();
 }
 
-void AudioTrack::pause(Badge<HTMLAudioElement>)
+void AudioTrack::pause()
 {
     m_audio_plugin->pause_playback();
 }

Libraries/LibWeb/HTML/AudioTrack.h

@@ -22,8 +22,8 @@ public:
 
     void set_audio_track_list(Badge<AudioTrackList>, GC::Ptr<AudioTrackList> audio_track_list) { m_audio_track_list = audio_track_list; }
 
-    void play(Badge<HTMLAudioElement>);
+    void play();
-    void pause(Badge<HTMLAudioElement>);
+    void pause();
 
     AK::Duration duration();
     void seek(double, MediaSeekMode);

Libraries/LibWeb/HTML/HTMLAudioElement.cpp

@@ -55,14 +55,14 @@ Layout::AudioBox const* HTMLAudioElement::layout_node() const
 void HTMLAudioElement::on_playing()
 {
     audio_tracks()->for_each_enabled_track([](auto& audio_track) {
-        audio_track.play({});
+        audio_track.play();
     });
 }
 
 void HTMLAudioElement::on_paused()
 {
     audio_tracks()->for_each_enabled_track([](auto& audio_track) {
-        audio_track.pause({});
+        audio_track.pause();
     });
 }
 

Libraries/LibWeb/HTML/HTMLVideoElement.cpp

@@ -16,6 +16,7 @@
 #include <LibWeb/Fetch/Infrastructure/FetchController.h>
 #include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
 #include <LibWeb/Fetch/Infrastructure/HTTP/Responses.h>
+#include <LibWeb/HTML/AudioTrackList.h>
 #include <LibWeb/HTML/HTMLVideoElement.h>
 #include <LibWeb/HTML/VideoTrack.h>
 #include <LibWeb/HTML/VideoTrackList.h>
@@ -130,18 +131,37 @@ void HTMLVideoElement::on_playing()
 {
     if (m_video_track)
         m_video_track->play_video({});
+
+    audio_tracks()->for_each_enabled_track([](auto& audio_track) {
+        audio_track.play();
+    });
 }
 
 void HTMLVideoElement::on_paused()
 {
     if (m_video_track)
         m_video_track->pause_video({});
+
+    audio_tracks()->for_each_enabled_track([](auto& audio_track) {
+        audio_track.pause();
+    });
 }
 
 void HTMLVideoElement::on_seek(double position, MediaSeekMode seek_mode)
 {
     if (m_video_track)
         m_video_track->seek(AK::Duration::from_milliseconds(position * 1000.0), seek_mode);
+
+    audio_tracks()->for_each_enabled_track([&](auto& audio_track) {
+        audio_track.seek(position, seek_mode);
+    });
+}
+
+void HTMLVideoElement::on_volume_change()
+{
+    audio_tracks()->for_each_enabled_track([&](auto& audio_track) {
+        audio_track.update_volume();
+    });
 }
 
 // https://html.spec.whatwg.org/multipage/media.html#attr-video-poster

Libraries/LibWeb/HTML/HTMLVideoElement.h

@@ -66,6 +66,7 @@ private:
     virtual void on_playing() override;
     virtual void on_paused() override;
     virtual void on_seek(double, MediaSeekMode) override;
+    virtual void on_volume_change() override;
 
     WebIDL::ExceptionOr<void> determine_element_poster_frame(Optional<String> const& poster);