libvlc: add f_zoom in libvlc_video_viewpoint_t

include/vlc/libvlc_media_player.h

@@ -1177,6 +1177,7 @@ typedef struct libvlc_video_viewpoint_t
     float f_pitch;         /**< view point pitch in degrees */
     float f_roll;          /**< view point roll in degrees */
     float f_field_of_view; /**< field of view in degrees (default 80.0f) */
+    float f_zoom;          /**< zoom factor, [-1.f, 1.f] range, default to 0.f */
 } libvlc_video_viewpoint_t;
 
 /**

lib/video.c

@@ -287,7 +287,8 @@ libvlc_video_viewpoint_t *libvlc_video_new_viewpoint(void)
     libvlc_video_viewpoint_t *p_vp = malloc(sizeof *p_vp);
     if (unlikely(p_vp == NULL))
         return NULL;
-    p_vp->f_yaw = p_vp->f_pitch = p_vp->f_roll = p_vp->f_field_of_view = 0.0f;
+    p_vp->f_yaw = p_vp->f_pitch = p_vp->f_roll = p_vp->f_field_of_view =
+    p_vp->f_zoom = 0.0f;
     return p_vp;
 }
 
@@ -300,7 +301,7 @@ int libvlc_video_update_viewpoint( libvlc_media_player_t *p_mi,
         .pitch = p_viewpoint->f_pitch,
         .roll  = p_viewpoint->f_roll,
         .fov   = p_viewpoint->f_field_of_view,
-        .zoom  = 0.0f,
+        .zoom  = p_viewpoint->f_zoom,
     };
 
     input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi );
@@ -322,6 +323,7 @@ int libvlc_video_update_viewpoint( libvlc_media_player_t *p_mi,
         p_mi->viewpoint.pitch += p_mi->viewpoint.pitch;
         p_mi->viewpoint.roll += p_mi->viewpoint.roll;
         p_mi->viewpoint.fov += p_mi->viewpoint.fov;
+        p_mi->viewpoint.zoom += p_mi->viewpoint.zoom;
     }
     else
         p_mi->viewpoint = update;