简介：本文使用cocos2d-x和libvlc两大免费开源的跨平台框架，实现一个视频播放器。开发工具使用Visual Studio 2010，测试运行平台为Windows（其它平台暂时没测试）。cocos2d-x版本2.0.3，VLC版本2.0.5。
目前游戏程序开发者大部分在以下几个平台上开发游戏：Windows、Mac OS X、IOS和Android。开发2D游戏且跨平台，cocos2d-x是个非常不错的选择，而libvlc也提供了各大平台的支持，因此使用这两大框架基本可以做到一次编写，全平台运行的目的。
打开Visual Studio 2010，新建一个Cocos2d-win32 Application项目，我这里叫Cocos2dPlayer，配置好整个项目，直到可以编译通过且能运行（如何配置可以参考网上很多帖子教程，在此就不多说，见谅）。另外还要加上vlc头文件、库文件和动态链接库文件，我是直接下载vlc播放器的安装版本然后在sdk目录中把vlc文件夹拷贝到Visual Studio 2010的VC\include目录下，库文件和动态链接库文件则放在本项目的Debug.win32和Release.win32目录下。
接下来进入正题：
创建文件MoviePlayer.h和MoviePlayer.cpp
MoviePlayer.h
#ifndef __MOVIEPLAYER_H__
#define __MOVIEPLAYER_H__
/****************************************************************************
http://www.cnblogs.com/evan-cai/
Author: Evan-Cai
Date: 2013-01-25
****************************************************************************/
#include <vlc\vlc.h>
#include "sprite_nodes\CCSprite.h"
NS_CC_BEGIN
class MoviePlayer : public CCSprite
{
public:
~MoviePlayer();
static MoviePlayer * instance(void);
bool init(void);
void play(char *path);
void stop(void);
void pause(void);
void draw(void);
protected:
MoviePlayer();
private:
libvlc_instance_t *vlc;
libvlc_media_player_t *vlc_player;
unsigned int width;
unsigned int height;
static MoviePlayer * _instance;
};
NS_CC_END
#endif
MoviePlayer.cpp
#include "MoviePlayer.h"
#include "CCDirector.h"
NS_CC_BEGIN
MoviePlayer * MoviePlayer::_instance = 0;
static char * videobuf = 0;
static void *lock(void *data, void **p_pixels)
{
*p_pixels = videobuf;
return NULL;
}
static void unlock(void *data, void *id, void *const *p_pixels)
{
assert(id == NULL);
}
static void display(void *data, void *id)
{
(void) data;
assert(id == NULL);
}
MoviePlayer::MoviePlayer():
vlc(0), vlc_player(0)
{
init();
}
MoviePlayer::~MoviePlayer()
{
CCSprite::~CCSprite();
free(videobuf);
libvlc_media_player_stop(vlc_player);
libvlc_media_player_release(vlc_player);
libvlc_release(vlc);
}
bool MoviePlayer::init(void)
{
vlc = libvlc_new(0, NULL);
vlc_player = libvlc_media_player_new(vlc);
CCSize size = CCDirector::sharedDirector()->getWinSize();
width = size.width;
height = size.height;
videobuf = (char *)malloc((width * height) << 2);
memset(videobuf, 0, (width * height) << 2);
libvlc_video_set_callbacks(vlc_player, lock, unlock, display, NULL);
libvlc_video_set_format(vlc_player, "RGBA", width, height, width << 2);
CCTexture2D *texture = new CCTexture2D();
texture->initWithData(videobuf, kCCTexture2DPixelFormat_RGBA8888, width, height, size);
return initWithTexture(texture);
}
void MoviePlayer::play(char *path)
{
libvlc_media_t *media = libvlc_media_new_path(vlc, path);
libvlc_media_player_set_media(vlc_player, media);
libvlc_media_release(media);
libvlc_media_player_play(vlc_player);
}
void MoviePlayer::stop(void)
{
libvlc_media_player_stop(vlc_player);
}
void MoviePlayer::pause(void)
{
libvlc_media_player_pause(vlc_player);
}
void MoviePlayer::draw(void)
{
CC_PROFILER_START_CATEGORY(kCCProfilerCategorySprite, "CCSprite - draw");
CCAssert(!m_pobBatchNode, "If CCSprite is being rendered by CCSpriteBatchNode, CCSprite#draw SHOULD NOT be called");
CC_NODE_DRAW_SETUP();
ccGLBlendFunc( m_sBlendFunc.src, m_sBlendFunc.dst );
if (m_pobTexture != NULL)
{
ccGLBindTexture2D( m_pobTexture->getName() );
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,(uint8_t *) videobuf);
}
else
{
ccGLBindTexture2D(0);
}
//
// Attributes
//
ccGLEnableVertexAttribs( kCCVertexAttribFlag_PosColorTex );
#define kQuadSize sizeof(m_sQuad.bl)
long offset = (long)&m_sQuad;
// vertex
int diff = offsetof( ccV3F_C4B_T2F, vertices);
glVertexAttribPointer(kCCVertexAttrib_Position, 3, GL_FLOAT, GL_FALSE, kQuadSize, (void*) (offset + diff));
// texCoods
diff = offsetof( ccV3F_C4B_T2F, texCoords);
glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, kQuadSize, (void*)(offset + diff));
// color
diff = offsetof( ccV3F_C4B_T2F, colors);
glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (void*)(offset + diff));
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
CHECK_GL_ERROR_DEBUG();
CC_INCREMENT_GL_DRAWS(1);
CC_PROFILER_STOP_CATEGORY(kCCProfilerCategorySprite, "CCSprite - draw");
}
MoviePlayer * MoviePlayer::instance()
{
if(_instance == 0)
_instance = new MoviePlayer();
return _instance;
}
NS_CC_END
然后编辑HelloWorldScene.cpp文件的init函数，最后函数如下：
（说明：我把HelloWorld类改成了Cocos2dPlayer类，所以浏览本文章的朋友只要把下面的Cocos2dPlayer::init改成HelloWorld::init就可以编译运行了，另外Can't Wait.mp4是我在网络上下载下来的mp4文件，请朋友你自行更改名称_）
bool Cocos2dPlayer::init()
{
bool bRet = false;
do
{
//////////////////////////////////////////////////////////////////////////
// super init first
//////////////////////////////////////////////////////////////////////////
CC_BREAK_IF(! CCLayer::init());
//////////////////////////////////////////////////////////////////////////
// add your codes below...
//////////////////////////////////////////////////////////////////////////
// 1. Add a menu item with "X" image, which is clicked to quit the program.
// Create a "close" menu item with close icon, it's an auto release object.
CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
"CloseNormal.png",
"CloseSelected.png",
this,
menu_selector(Cocos2dPlayer::menuCloseCallback));
CC_BREAK_IF(! pCloseItem);
// Place the menu item bottom-right conner.
pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20));
// Create a menu with the "close" menu item, it's an auto release object.
CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
pMenu->setPosition(CCPointZero);
CC_BREAK_IF(! pMenu);
// Add the menu to Cocos2dPlayer layer as a child layer.
this->addChild(pMenu, 1);
// 2. Add a label shows "Hello World".
// Create a label and initialize with string "Hello World".
//CCLabelTTF* pLabel = CCLabelTTF::create("Let's PLAY!", "Arial", 24);
//CC_BREAK_IF(! pLabel);
// Get window size and place the label upper.
CCSize size = CCDirector::sharedDirector()->getWinSize();
//pLabel->setPosition(ccp(size.width / 2, size.height - 50));
// Add the label to Cocos2dPlayer layer as a child layer.
//this->addChild(pLabel, 1);
// 3. Add add a splash screen, show the cocos2d splash image.
MoviePlayer* pPlayer = MoviePlayer::instance();
// Place the sprite on the center of the screen
pPlayer->setPosition(ccp(size.width/2, size.height/2));
// Add the sprite to Cocos2dPlayer layer as a child layer.
this->addChild(pPlayer, 0);
pPlayer->play("Can't Wait.mp4");
bRet = true;
} while (0);
return bRet;
}
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