Doc: Added missing images and made some language edits

Change-Id: I9544121601c2c4099927e0e23550c3ab32bbfda9
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

examples/audioinput/doc/src/audioinput.qdoc

@@ -30,7 +30,14 @@
     \title Audio Input Example
     \ingroup audio_examples
     \brief The Audio Input Example shows the use of the QAudioInput class.
+    The example demonstrates the basic use cases of the QAudioInput class.
 
+    \image audioinput-example.png
+
+    Qt provides the QAudioInput class to enable audio functionality within
+    a standard application user interface.
+
+    This example calculates the maximum linear value of the input audio from the microphone and displays the output.
 */
 
 

examples/audiooutput/doc/src/audiooutput.qdoc

@@ -31,8 +31,13 @@
     \ingroup audio_examples
     \brief The Audio Output Example show the use of the QAudioOutput API.
 
+    The example demonstrates the basic use cases of the QAudioOutput class.
 
+    \image audiooutput-example.png
 
+    This example provides a tone generator to supply continuous audio playback.
+    The first button allows pause and resume of the playback, and the second
+    button allows toggling between push and pull modes of operation.
 */
 
 

examples/spectrum/doc/src/spectrum.qdoc

@@ -31,6 +31,34 @@
     \ingroup audio_examples
     \brief The Spectrum Example uses a combination multimedia APIs to process microphone input.
 
+    The Spectrum Analyzer example shows how the \l{QtMultimedia Module} can be
+    used to record and then play back an audio stream.
+
+    \image spectrum-demo.png
+
+    Because QtMultimedia allows the application to access the raw audio
+    stream, the data can either be inspected or modified by the application.
+    The Spectrum Analyzer example displays three pieces of information while
+    audio is being either captured or played back:
+
+    \list
+    \li Information about the raw audio stream, shown in the uppermost widget:
+    \list
+        \li The amount of data currently in the buffer, shown in blue
+        \li The segment of data which was most recently analysed to compute
+        the frequency spectrum, shown in green
+        \li The raw audio waveform, shown in white and scrolling from right to
+        left
+    \endlist
+    \li A representation of the frequency spectrum, shown at the lower left
+    \li The current RMS level of the audio stream, and the recent 'high
+    watermark' level, shown at the lower right
+    \endlist
+
+    Spectrum analysis is performed by calculating the Fast Fourier Transform
+    (FFT) of a segment of audio data.  An open-source library,
+    \l{http://ldesoras.free.fr/prod.html}{FFTReal}, against which the
+    application is dynamically linked, is used to compute the transform.
 */
 
 

examples/videographicsitem/doc/src/videographicsitem.qdoc

@@ -29,8 +29,12 @@
 \example videographicsitem
 \title Video Graphics Item Example
 \ingroup video_examples
+\brief This example demonstrates how to stream video on a graphics scene.
 
-\brief This example demonstrates how to make a simple video player using the QMediaPlayer
-and QVideoGraphicsItem classes in the Graphics View framework.
+    The Video Graphics Item example shows how to implement a QGraphicsItem that displays video on a
+    graphics scene using QtMultimedia's QAbstractVideoSurface.
 
+    \image video-videographicsitem.png
+
+    \sa {Video Widget Example}
 */

examples/videowidget/doc/src/videowidget.qdoc

@@ -26,11 +26,13 @@
 ****************************************************************************/
 
 /*!
-\example videowidget
-\title Video Widget Example
-\ingroup video_examples
+    \example videowidget
+    \title Video Widget Example
+    \ingroup video_examples
+    \brief This example is a simple video player
 
-\brief This example demonstrates how to make a simple video player using the QMediaPlayer
-and QVideoWidget classes
+    The Video Widget example denonstrates how to implement a video widget using
+    QtMultimedia's QAbstractVideoSurface.
 
+    \image video-videowidget.png
 */

src/multimedia/doc/qtmultimedia.qdocconf

@@ -29,8 +29,7 @@ qhp.qtmultimedia.subprojects.qmltypes.indexTitle = Qt Multimedia QML Types
 qhp.qtmultimedia.subprojects.qmltypes.selectors = class fake:headerfile
 qhp.qtmultimedia.subprojects.qmltypes.sortPages = true
 
-exampledirs += .. \
-               ../../../examples
+exampledirs += ../../../examples \
 
 headerdirs += ../..