新增视频流播放

vlcdemo/vlc/vlc3/include/plugins/vlc_viewpoint.h

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+/*****************************************************************************
+ * vlc_viewpoint.h: viewpoint struct and helpers
+ *****************************************************************************
+ * Copyright (C) 2017 VLC authors and VideoLAN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef VLC_VIEWPOINT_H_
+#define VLC_VIEWPOINT_H_ 1
+
+#include <vlc_common.h>
+
+#include <math.h>
+
+/**
+ * \defgroup output Output
+ * \ingroup output
+ *
+ * @{
+ * \file
+ * Video and audio viewpoint struct and helpers
+ */
+
+#define FIELD_OF_VIEW_DEGREES_DEFAULT  80.f
+#define FIELD_OF_VIEW_DEGREES_MAX 150.f
+#define FIELD_OF_VIEW_DEGREES_MIN 20.f
+
+/**
+ * Viewpoints
+ */
+struct vlc_viewpoint_t {
+    float yaw;   /* yaw in degrees */
+    float pitch; /* pitch in degrees */
+    float roll;  /* roll in degrees */
+    float fov;   /* field of view in degrees */
+};
+
+static inline void vlc_viewpoint_init( vlc_viewpoint_t *p_vp )
+{
+    p_vp->yaw = p_vp->pitch = p_vp->roll = 0.0f;
+    p_vp->fov = FIELD_OF_VIEW_DEGREES_DEFAULT;
+}
+
+static inline void vlc_viewpoint_clip( vlc_viewpoint_t *p_vp )
+{
+    p_vp->yaw = fmodf( p_vp->yaw, 360.f );
+    p_vp->pitch = fmodf( p_vp->pitch, 360.f );
+    p_vp->roll = fmodf( p_vp->roll, 360.f );
+    p_vp->fov = VLC_CLIP( p_vp->fov, FIELD_OF_VIEW_DEGREES_MIN,
+                          FIELD_OF_VIEW_DEGREES_MAX );
+}
+
+/**@}*/
+
+#endif /* VLC_VIEWPOINT_H_ */