osx/framework: added convenience methods for jumps within a stream

projects/macosx/framework/Headers/Public/VLCMediaPlayer.h

@@ -190,6 +190,58 @@ extern NSString * VLCMediaPlayerStateToString(VLCMediaPlayerState state);
  */
 - (void)rewindAtRate:(float)rate;
 
+/**
+ * Jumps shortly backward in current stream if seeking is supported.
+ * \param interval to skip, in sec.
+ */
+- (void)jumpBackward:(NSInteger)interval;
+
+/**
+ * Jumps shortly forward in current stream if seeking is supported.
+ * \param interval to skip, in sec.
+ */
+- (void)jumpForward:(NSInteger)interval;
+
+/**
+ * Jumps shortly backward in current stream if seeking is supported.
+ */
+- (void)extraShortJumpBackward;
+
+/**
+ * Jumps shortly forward in current stream if seeking is supported.
+ */
+- (void)extraShortJumpForward;
+
+/**
+ * Jumps shortly backward in current stream if seeking is supported.
+ */
+- (void)shortJumpBackward;
+
+/**
+ * Jumps shortly forward in current stream if seeking is supported.
+ */
+- (void)shortJumpForward;
+
+/**
+ * Jumps shortly backward in current stream if seeking is supported.
+ */
+- (void)mediumJumpBackward;
+
+/**
+ * Jumps shortly forward in current stream if seeking is supported.
+ */
+- (void)mediumJumpForward;
+
+/**
+ * Jumps shortly backward in current stream if seeking is supported.
+ */
+- (void)longJumpBackward;
+
+/**
+ * Jumps shortly forward in current stream if seeking is supported.
+ */
+- (void)longJumpForward;
+
 /* Playback Information */
 /**
  * Playback state flag identifying that the stream is currently playing.

projects/macosx/framework/Sources/VLCMediaPlayer.m

@@ -516,6 +516,64 @@ static void HandleMediaInstanceStateChanged(const libvlc_event_t * event, void *
     [self setRate: -rate];
 }
 
+- (void)jumpBackward:(NSInteger)interval
+{
+    if( [self isSeekable] )
+    {
+        interval = interval * 1000000;
+        [self setTime: [VLCTime timeWithInt: ([[self time] intValue] - interval)]];
+    }
+}
+
+- (void)jumpForward:(NSInteger)interval
+{
+    if( [self isSeekable] )
+    {
+        interval = interval * 1000000;
+        [self setTime: [VLCTime timeWithInt: ([[self time] intValue] + interval)]];
+    }
+}
+
+- (void)extraShortJumpBackward
+{
+    [self jumpBackward:3];
+}
+
+- (void)extraShortJumpForward
+{
+    [self jumpForward:3];
+}
+
+- (void)shortJumpBackward
+{
+    [self jumpBackward:10];
+}
+
+- (void)shortJumpForward
+{
+    [self jumpForward:10];
+}
+
+- (void)mediumJumpBackward
+{
+    [self jumpBackward:60];
+}
+
+- (void)mediumJumpForward
+{
+    [self jumpForward:60];
+}
+
+- (void)longJumpBackward
+{
+    [self jumpBackward:300];
+}
+
+- (void)longJumpForward
+{
+    [self jumpForward:300];
+}
+
 + (NSSet *)keyPathsForValuesAffectingIsPlaying
 {
     return [NSSet setWithObjects:@"state", nil];