Add docs for wavpack elements (#352476).

Original commit message from CVS:
Patch by: Sebastian Dröge <slomo at circular-chaos.org>
* docs/plugins/Makefile.am:
* docs/plugins/gst-plugins-bad-plugins-docs.sgml:
* docs/plugins/gst-plugins-bad-plugins-sections.txt:
* docs/plugins/gst-plugins-bad-plugins.hierarchy:
* docs/plugins/inspect/plugin-wavpack.xml:
* ext/wavpack/gstwavpackdec.c:
* ext/wavpack/gstwavpackdec.h:
* ext/wavpack/gstwavpackenc.c:
* ext/wavpack/gstwavpackenc.h:
* ext/wavpack/gstwavpackparse.c:
* ext/wavpack/gstwavpackparse.h:
Add docs for wavpack elements (#352476).

ext/wavpack/gstwavpackdec.c

@@ -21,6 +21,25 @@
  * Boston, MA 02111-1307, USA.
  */
 
+/**
+ * SECTION:element-wavpackdec
+ *
+ * <refsect2>
+ * wavpackdec decodes framed (for example by the wavpackparse element)
+ * Wavpack streams and decodes them to raw audio.
+ * <ulink url="http://www.wavpack.com/">Wavpack</ulink> is an open-source
+ * audio codec that features both lossless and lossy encoding.
+ * <title>Example launch line</title>
+ * <para>
+ * <programlisting>
+ * gst-launch filesrc location=test.wv ! wavpackparse ! wavpackdec ! audioconvert ! audioresample ! autoaudiosink
+ * </programlisting>
+ * This pipeline decodes the Wavpack file test.wv into raw audio buffers and
+ * tries to play it back using an automatically found audio sink.
+ * </para>
+ * </refsect2>
+ */
+
 #include <gst/gst.h>
 #include <gst/audio/audio.h>
 

ext/wavpack/gstwavpackdec.h

@@ -30,7 +30,7 @@
 #include "gstwavpackstreamreader.h"
 
 G_BEGIN_DECLS
-/* #define's don't like whitespacey bits */
+
 #define GST_TYPE_WAVPACK_DEC \
   (gst_wavpack_dec_get_type())
 #define GST_WAVPACK_DEC(obj) \
@@ -48,6 +48,7 @@ struct _GstWavpackDec
 {
   GstElement element;
 
+  /*< private >*/
   GstPad              *sinkpad;
   GstPad              *srcpad;
 

ext/wavpack/gstwavpackenc.c

@@ -19,6 +19,37 @@
  * Boston, MA 02111-1307, USA.
  */
 
+/**
+ * SECTION:element-wavpackenc
+ *
+ * <refsect2>
+ * Wavpackenc encodes raw audio into a framed Wavpack stream.
+ * <ulink url="http://www.wavpack.com/">Wavpack</ulink> is an open-source
+ * audio codec that features both lossless and lossy encoding.
+ * <title>Example launch line</title>
+ * <para>
+ * <programlisting>
+ * gst-launch audiotestsrc num-buffers=500 ! wavpackenc ! filesink location=sinewave.wv
+ * </programlisting>
+ * This pipeline encodes audio from audiotestsrc into a Wavpack file.
+ * </para>
+ * <para>
+ * <programlisting>
+ * gst-launch cdda://1 ! wavpackenc ! filesink location=track1.wv
+ * </programlisting>
+ * This pipeline encodes audio from an audio CD into a Wavpack file using
+ * lossless encoding (the file output will be fairly large).
+ * </para>
+ * <para>
+ * <programlisting>
+ * gst-launch cdda://1 ! wavpackenc bitrate=128000 ! filesink location=track1.wv
+ * </programlisting>
+ * This pipeline encodes audio from an audio CD into a Wavpack file using
+ * lossy encoding at a certain bitrate (the file will be fairly small).
+ * </para>
+ * </refsect2>
+ */
+
 /*
  * TODO: - add multichannel handling. channel_mask is:
  *                  front left

ext/wavpack/gstwavpackenc.h

@@ -29,7 +29,6 @@
 
 G_BEGIN_DECLS
 
-/* defines don't like whitespacey bits */
 #define GST_TYPE_WAVPACK_ENC \
   (gst_wavpack_enc_get_type())
 #define GST_WAVPACK_ENC(obj) \
@@ -55,6 +54,7 @@ struct _GstWavpackEnc
 {
   GstElement element;
 
+  /*< private >*/
   GstPad *sinkpad, *srcpad;
   GstPad *wvcsrcpad;
 

ext/wavpack/gstwavpackparse.c

@@ -21,6 +21,23 @@
  * Boston, MA 02111-1307, USA.
  */
 
+/**
+ * SECTION:element-wavpackparse
+ *
+ * <refsect2>
+ * Wavpackparse takes raw, unframed Wavpack streams and splits them into
+ * single Wavpack chunks with information like bit depth and the position
+ * in the stream.
+ * <title>Example launch line</title>
+ * <para>
+ * <programlisting>
+ * gst-launch filesrc location=test.wv ! wavpackparse ! wavpackdec ! fakesink
+ * </programlisting>
+ * This pipeline decodes the Wavpack file test.wv into raw audio buffers.
+ * </para>
+ * </refsect2>
+ */
+
 #include <gst/gst.h>
 
 #include <math.h>

ext/wavpack/gstwavpackparse.h

@@ -27,7 +27,6 @@
 
 G_BEGIN_DECLS
 
-/* #define's don't like whitespacey bits */
 #define GST_TYPE_WAVPACK_PARSE \
   (gst_wavpack_parse_get_type())
 #define GST_WAVPACK_PARSE(obj) \
@@ -53,6 +52,7 @@ struct _GstWavpackParse
 {
   GstElement     element;
 
+  /*< private >*/
   GstPad        *sinkpad;
   GstPad        *srcpad;