GStreamer: improve QGstCodecsInfo

- The class now works with GStreamer < 0.10.31.
- New codecElement() function that returns the GStreamer encoder name
  for a given codec.
- New codecOptions() function that returns the list of available
  GStreamer properties for a given codec.
- Don't return duplicate codecs (when several GStreamer plugins are
  available for a given codec). We now only use the highest ranked
  one.

Change-Id: I4a79099d4469907c73046d7e78df737fe4ed036c
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

1 files changed, 13 insertions, 7 deletions

diff --git a/src/multimedia/gsttools_headers/qgstcodecsinfo_p.h b/src/multimedia/gsttools_headers/qgstcodecsinfo_p.h
index 64e9ac21f..af1a4486f 100644
--- a/src/multimedia/gsttools_headers/qgstcodecsinfo_p.h
+++ b/src/multimedia/gsttools_headers/qgstcodecsinfo_p.h
@@ -63,22 +63,28 @@ class QGstCodecsInfo
 public:
     enum ElementType { AudioEncoder, VideoEncoder, Muxer };
 
+    struct CodecInfo {
+        QString description;
+        QByteArray elementName;
+        GstRank rank;
+    };
+
     QGstCodecsInfo(ElementType elementType);
 
     QStringList supportedCodecs() const;
     QString codecDescription(const QString &codec) const;
-
-#if GST_CHECK_VERSION(0,10,31)
-    static GstCaps* supportedElementCaps(GstElementFactoryListType elementType,
-                                         GstRank minimumRank = GST_RANK_MARGINAL,
-                                         GstPadDirection padDirection = GST_PAD_SRC);
-#endif
+    QByteArray codecElement(const QString &codec) const;
+    QStringList codecOptions(const QString &codec) const;
 
 private:
+    void updateCodecs(ElementType elementType);
+    GList *elementFactories(ElementType elementType) const;
+
     QStringList m_codecs;
-    QMap<QString,QString> m_codecDescriptions;
+    QMap<QString, CodecInfo> m_codecInfo;
 };
 
+Q_DECLARE_TYPEINFO(QGstCodecsInfo::CodecInfo, Q_MOVABLE_TYPE);
 
 QT_END_NAMESPACE