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windows使用libvlc进行网络串流遇到的一些问题及解决方法

2024-07-11 03:59:18   223人阅读

先贴代码，

#define WIFI_W 640
#define WIFI_H  480

struct ctx{    uchar* frame;};class CConnectWIFI{public:    CConnectWIFI(void);    void Init(HWND hWnd);        libvlc_instance_t*        m_vlcInst;    libvlc_media_player_t*    m_vlcMplay;    libvlc_media_t*            m_vlcMedia;    struct ctx context;        ~CConnectWIFI(void);};CConnectWIFI::CConnectWIFI(void){    m_vlcInst = NULL;    m_vlcMplay = NULL;    m_vlcMedia = NULL;            context.frame = new uchar[WIFI_W * WIFI_H * 3];    memset(context.frame, 0, WIFI_W*WIFI_H*3);    m_vlcInst = libvlc_new(0, NULL);    }CConnectWIFI::~CConnectWIFI(void){    if(m_vlcMplay)    {        libvlc_media_player_release(m_vlcMplay);        m_vlcMplay = NULL;    }    if(m_vlcInst)    {        libvlc_release(m_vlcInst);        m_vlcInst = NULL;    }    if (context.frame)    {        delete []context.frame;        context.frame = NULL;    }}void* lock(void* data, void** p_pixels){    struct ctx* ctx = (struct ctx*)data;    *p_pixels = ctx->frame;    return NULL;}void unlock(void* data, void* id, void* const* p_pixels){    uchar* pixels = (uchar*)*p_pixels;            ImageProcessCallBack(pixels, WIFI_W, WIFI_H);}void display(void *data, void *id){    //(void) data;    //ASSERT(id == NULL);}void CConnectWIFI::Init(HWND hWnd){    m_vlcMedia = libvlc_media_new_location(m_vlcInst, "http://10.10.1.1:8196");    libvlc_media_add_option(m_vlcMedia, ":network-caching=10");    m_vlcMplay = libvlc_media_player_new_from_media(m_vlcMedia);        libvlc_media_player_set_hwnd(m_vlcMplay, hWnd);    libvlc_media_release(m_vlcMedia);            libvlc_video_set_callbacks(m_vlcMplay, lock, unlock, display, &context);    libvlc_video_set_format(m_vlcMplay, "RV24", WIFI_W, WIFI_H, WIFI_W * 3);    int res = libvlc_media_player_play(m_vlcMplay);}
以上代码是访问wifi图像设备的一段代码，也是第一次接触vlc，很多地方不是很清楚。
其中libvlc_media_add_option(m_vlcMedia, ":network-caching=10");是为了解决缓冲时间过长导致延迟的问题，如果太大了则延迟严重，太小了则很卡，根据情况设定。另外还有个问题不理解，连接正常之后，突然中断网络，竟然还能调用回调函数ImageProcessCallBack，且一只调用，只不过都是同一帧数据。难道是所谓的“拉”（pull）模式？这个问题怎么解决，有做过的麻烦请在下方留言，感谢！






























        

            
                
                  
                
                

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