Update documentation.

Rewrite the module overview, add video and audio overviews,
and update the camera overview. Tweak the radiooverview
slightly.

Still missing some links for examples and some fleshing out
but hopefully a lot better.

Change-Id: Id6486e20ba4a09c36d7739e327d4f9910ad083a5
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>

doc/src/snippets/multimedia-snippets/media.cpp

@@ -169,6 +169,25 @@ void MediaExample::MediaPlayer()
     player->play();
     //! [Player]
 
+    //! [Local playback]
+    player = new QMediaPlayer;
+    // ...
+    player->setMedia(QUrl::fromLocalFile("/Users/me/Music/coolsong.mp3"));
+    player->setVolume(50);
+    player->play();
+    //! [Local playback]
+
+    //! [Audio playlist]
+    player = new QMediaPlayer;
+
+    playlist = new QMediaPlaylist(player);
+    playlist->addMedia(QUrl("http://example.com/myfile1.mp3"));
+    playlist->addMedia(QUrl("http://example.com/myfile2.mp3"));
+    // ...
+    playlist->setCurrentIndex(1);
+    player->play();
+    //! [Audio playlist]
+
     //! [Movie playlist]
     playlist = new QMediaPlaylist;
     playlist->addMedia(QUrl("http://example.com/movie1.mp4"));
@@ -194,7 +213,7 @@ void MediaExample::MediaRecorder()
     recorder = new QMediaRecorder(camera);
 
     QAudioEncoderSettings audioSettings;
-    audioSettings.setCodec("audio/vorbis");
+    audioSettings.setCodec("audio/amr");
     audioSettings.setQuality(QtMultimedia::HighQuality);
 
     recorder->setEncodingSettings(audioSettings);
@@ -202,6 +221,21 @@ void MediaExample::MediaRecorder()
     recorder->setOutputLocation(QUrl::fromLocalFile(fileName));
     recorder->record();
     //! [Media recorder]
+
+#if 0
+    //! [Audio recorder]
+    audioRecorder = new QAudioRecorder;
+
+    QAudioEncoderSettings audioSettings;
+    audioSettings.setCodec("audio/amr");
+    audioSettings.setQuality(QtMultimedia::HighQuality);
+
+    audioRecorder->setEncodingSettings(audioSettings);
+
+    audioRecorder->setOutputLocation(QUrl::fromLocalFile("test.amr"));
+    audioRecorder->record();
+    //! [Audio recorder]
+#endif
 }
 
 void MediaExample::RadioTuna()