windows使用libvlc進行網絡串流遇到的一些問題及解決方法

先貼代碼，

#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);
}

以上代碼是訪問wifi圖像設備的一段代碼，也是第一次接觸vlc，很多地方不是很清楚。

其中libvlc_media_add_option(m_vlcMedia, ":network-caching=10");是為了解決緩沖時間過長導致延遲的問題，如果太大了則延遲嚴重，太小了則很卡，根據情況設定。另外還有個問題不理解，連接正常之后，突然中斷網絡，竟然還能調用回調函數ImageProcessCallBack，且一只調用，只不過都是同一幀數據。難道是所謂的“拉”（pull）模式？這個問題怎么解決，有做過的麻煩請在下方留言，感謝！