vo_corevideo: move to C from Objective-C

This file was alredy written in C. The only remaining part was the file
exension and `#import`s.

Makefile

@@ -76,7 +76,7 @@ SOURCES-$(SDL2)                 += video/out/vo_sdl.c
 SOURCES-$(COREAUDIO)            += audio/out/ao_coreaudio.c \
                                    audio/out/ao_coreaudio_utils.c \
                                    audio/out/ao_coreaudio_properties.c
-SOURCES-$(COREVIDEO)            += video/out/vo_corevideo.m
+SOURCES-$(COREVIDEO)            += video/out/vo_corevideo.c
 SOURCES-$(DIRECT3D)             += video/out/vo_direct3d.c \
                                    video/out/w32_common.c
 SOURCES-$(DSOUND)               += audio/out/ao_dsound.c

video/out/vo_corevideo.c

@@ -19,23 +19,21 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <QuartzCore/QuartzCore.h>
 #include <assert.h>
 
-#import "vo_corevideo.h"
+#include "talloc.h"
+#include "video/out/vo.h"
+#include "sub/sub.h"
+#include "core/m_option.h"
 
-// mplayer includes
-#import "talloc.h"
-#import "vo.h"
-#import "sub/sub.h"
-#import "core/m_option.h"
+#include "video/csputils.h"
+#include "video/vfcap.h"
+#include "video/mp_image.h"
 
-#import "video/csputils.h"
-#import "video/vfcap.h"
-#import "video/mp_image.h"
-
-#import "gl_common.h"
-#import "gl_osd.h"
-#import "cocoa_common.h"
+#include "gl_common.h"
+#include "gl_osd.h"
+#include "cocoa_common.h"
 
 struct quad {
     GLfloat lowerLeft[2];

video/out/vo_corevideo.h

@@ -1,28 +0,0 @@
-/*
- * CoreVideo video output driver
- *
- * Copyright (c) 2005 Nicolas Plourde <nicolasplourde@gmail.com>
- *
- * This file is part of MPlayer.
- *
- * MPlayer is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * MPlayer 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with MPlayer; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef MPLAYER_VO_COREVIDEO_H
-#define MPLAYER_VO_COREVIDEO_H
-
-#import <QuartzCore/QuartzCore.h>
-
-#endif /* MPLAYER_VO_COREVIDEO_H */