allowed querying of playback rate support

Author: axjxwright

src/AX-MediaPlayer.cxx

@@ -80,16 +80,21 @@ namespace AX
             _impl->TogglePlayback ( );
         }
 
-        void MediaPlayer::SetPlaybackRate ( float rate )
+        bool MediaPlayer::SetPlaybackRate ( float rate )
         {
-            _impl->SetPlaybackRate ( rate );
+            return _impl->SetPlaybackRate ( rate );
         }
 
         float MediaPlayer::GetPlaybackRate ( ) const
         {
             return _impl->GetPlaybackRate ( );
         }
 
+        bool MediaPlayer::IsPlaybackRateSupported ( float rate ) const
+        {
+            return _impl->IsPlaybackRateSupported ( rate );
+        }
+
         void MediaPlayer::SetMuted ( bool mute )
         {
             _impl->SetMuted ( mute );

src/AX-MediaPlayer.h

@@ -67,8 +67,9 @@ namespace AX::Video
         void    Pause ( );
         void    TogglePlayback ( );
 
-        void    SetPlaybackRate ( float rate );
+        bool    SetPlaybackRate ( float rate );
         float   GetPlaybackRate ( ) const;
+        bool    IsPlaybackRateSupported ( float rate ) const;
 
         void    SetMuted ( bool mute );
         bool    IsMuted  ( ) const;

src/Win32/AX-MediaPlayerWin32Impl.cxx

@@ -456,12 +456,17 @@ namespace AX::Video
         }
     }
 
-    void MediaPlayer::Impl::SetPlaybackRate ( float rate )
+    bool MediaPlayer::Impl::SetPlaybackRate ( float rate )
     {
         if ( _mediaEngine )
         {
-            _mediaEngine->SetPlaybackRate ( rate );
+            if ( IsPlaybackRateSupported ( rate ) )
+            {
+                return SUCCEEDED ( _mediaEngine->SetPlaybackRate ( static_cast<double> ( rate ) ) );
+            }
         }
+
+        return false;
     }
 
     float MediaPlayer::Impl::GetPlaybackRate ( ) const
@@ -474,6 +479,16 @@ namespace AX::Video
         return 1.0f;
     }
 
+    bool MediaPlayer::Impl::IsPlaybackRateSupported ( float rate ) const
+    {
+        if ( _mediaEngineEx )
+        {
+            return _mediaEngineEx->IsPlaybackRateSupported ( static_cast<double> ( rate ) );
+        }
+
+        return false;
+    }
+
     void MediaPlayer::Impl::SetMuted ( bool mute )
     {
         if ( _mediaEngine )

src/Win32/AX-MediaPlayerWin32Impl.h

@@ -89,8 +89,9 @@ namespace AX::Video
         void    Pause ( );
         void    TogglePlayback ( );
 
-        void    SetPlaybackRate ( float rate );
+        bool    SetPlaybackRate ( float rate );
         float   GetPlaybackRate ( ) const;
+        bool    IsPlaybackRateSupported ( float rate ) const;
 
         void    SetMuted ( bool mute );
         bool    IsMuted ( ) const;