android: fix green line issue when using an YUV surface in SW mode.

The padding lines introduced by avcodec for direct rendering are set
to black since they might be used by Android during rescaling.

modules/video_output/android/surface.c

@@ -329,6 +329,13 @@ static void SetupPictureYV12( SurfaceInfo* p_surfaceInfo, picture_t *p_picture )
         p->p_pixels = o->p_pixels + o->i_lines * o->i_pitch;
         p->i_pitch  = i_c_stride;
         p->i_lines  = p_picture->format.i_height / 2;
+        /*
+          Explicitly set the padding lines of the picture to black (127 for YUV)
+          since they might be used by Android during rescaling.
+        */
+        int visible_lines = p_picture->format.i_visible_height / 2;
+        if (visible_lines < p->i_lines)
+            memset(&p->p_pixels[visible_lines * p->i_pitch], 127, (p->i_lines - visible_lines) * p->i_pitch);
     }
 
     if( vlc_fourcc_AreUVPlanesSwapped( p_picture->format.i_chroma,