Windows平台RTMP推送|轻量级RTSP服务如何实现摄像头叠加到屏幕输出

/* SmartPublisherDemoDlg.cs
 * Author: daniusdk.com
 */
//摄像头overlay到桌面
int left = Int32.Parse(edit_clip_left_.Text);
int top = Int32.Parse(edit_clip_top_.Text);
int w = Int32.Parse(edit_clip_width_.Text);
int h = Int32.Parse(edit_clip_height_.Text);
// 有一个是0， 就使用全屏
if ( w == 0 || h == 0 )
{
    left = 0;
    top = 0;
    GetScreenSize(ref w, ref h);
}
else
{
    // 保证4字节对齐
    w = NT_ByteAlign(w, 4);
    h = NT_ByteAlign(h, 4);
}
NTSmartPublisherSDK.NT_PB_ClearLayersConfig(publisher_handle_, 0, 0, IntPtr.Zero);
//第一层：屏幕
NT_PB_ScreenLayerConfig screen_layer_c0 = new NT_PB_ScreenLayerConfig();
type = (Int32)NTSmartPublisherDefine.NT_PB_E_LAYER_TYPE.NT_PB_E_LAYER_TYPE_SCREEN;
fill_layer_base(screen_layer_c0, out screen_layer_c0.base_, type, index, true, left, top, w, h);
screen_layer_index_ = screen_layer_c0.base_.index_;
screen_layer_c0.clip_region_.x_ = left;
screen_layer_c0.clip_region_.y_ = top;
screen_layer_c0.clip_region_.width_ = w;
screen_layer_c0.clip_region_.height_ = h;
screen_layer_c0.reserve_ = IntPtr.Zero;
if (add_layer_config(screen_layer_c0, type))
    index++;
//第二层：摄像头
if (-1 != cur_sel_camera_index_)
{
    int c_l = Int32.Parse(edit_camera_overlay_left_.Text);
    int c_t = Int32.Parse(edit_camera_overlay_top_.Text);
    int c_w = Int32.Parse(edit_camera_overlay_width_.Text);
    int c_h = Int32.Parse(edit_camera_overlay_height_.Text);
    if (c_w == 0)
    {
        c_w = w / 2;
    }
    if (c_h == 0)
    {
        c_h = h / 2;
    }
    ctos_camera_layer_c1_ = new NT_PB_CameraLayerConfigV2();
    CameraInfo camera = cameras_[cur_sel_camera_index_];
    NT_PB_VideoCaptureCapability cap = camera.capabilities_[cur_sel_camera_resolutions_index_];
    ctos_camera_layer_c1_.device_unique_id_utf8_ = camera.id_;
    type = (Int32)NTSmartPublisherDefine.NT_PB_E_LAYER_TYPE.NT_PB_E_LAYER_TYPE_CAMERA;
    fill_layer_base(ctos_camera_layer_c1_, out ctos_camera_layer_c1_.base_, type, index, true, c_l, c_t, c_w, c_h);
    camera_layer_index_ = ctos_camera_layer_c1_.base_.index_;
    if (btn_check_flip_horizontal_camera_.Checked)
    {
        ctos_camera_layer_c1_.is_flip_horizontal_ = 1;
    }
    else
    {
        ctos_camera_layer_c1_.is_flip_horizontal_ = 0;
    }
    if (btn_check_flip_vertical_camera_.Checked)
    {
        ctos_camera_layer_c1_.is_flip_vertical_ = 1;
    }
    else
    {
        ctos_camera_layer_c1_.is_flip_vertical_ = 0;
    }
    ctos_camera_layer_c1_.rotate_degress_ = GetCameraRotateDegress();
    if (add_layer_config(ctos_camera_layer_c1_, type))
        index++;
}
NTSmartPublisherSDK.NT_PB_SetFrameRate(publisher_handle_, UInt32.Parse(edit_frame_rate_.Text));

private void btn_disable_camera_overlay__Click(object sender, EventArgs e)
{
    if (btn_camera_overlay_to_desktop.Checked)
    {
        if (publisher_handle_ != IntPtr.Zero)
        {
            String str_btn_text = btn_disable_camera_overlay_.Text;
            String strStopOverlayCmr = "停止叠加摄像头";
            if (str_btn_text.Equals(strStopOverlayCmr))
            {
                if (NTBaseCodeDefine.NT_ERC_OK == NTSmartPublisherSDK.NT_PB_EnableLayer(publisher_handle_, 0,
                    camera_layer_index_, 0))
                {
                    btn_disable_camera_overlay_.Text = "叠加摄像头";
                }
            }
            else
            {
                if (NTBaseCodeDefine.NT_ERC_OK == NTSmartPublisherSDK.NT_PB_EnableLayer(publisher_handle_, 0,
                    camera_layer_index_, 1))
                {
                    btn_disable_camera_overlay_.Text = "停止叠加摄像头";
                }
            }
        }
    }
}