Unity环境下实现Camera高帧率RTMP推送

/*
* FrameTexture构建
* WebSite: https://github.com/daniulive/SmarterStreaming
*/
public class FrameTexture {
  public FrameTexture(Texture2D texture, int is_vertical_flip, int is_horizontal_flip, int scale_width, int scale_height) {
    texture_ = texture;
    is_vertical_flip_ = is_vertical_flip;
    is_horizontal_flip_ = is_horizontal_flip;
    scale_width_ = scale_width;
    scale_height_ = scale_height;
  }

  public Texture2D texture_ ;
  public int is_vertical_flip_ ;
  public int is_horizontal_flip_;
  public int scale_width_;
  public int scale_height_;
}

/**
   * 投递层RGBA8888图像,如果不需要Aplpha通道的话, 请使用RGBX8888接口, 效率高
   *
   * @param index: 层索引, 必须大于等于0, 注意:如果index是0的话，将忽略Alpha通道
   *
   * @param left: 层叠加的左上角坐标, 对于第0层的话传0
   *
   * @param top: 层叠加的左上角坐标, 对于第0层的话传0
   *
   * @param rgba_plane: rgba 图像数据
   *
   * @param offset: 图像偏移, 这个主要目的是用来做clip的, 一般传0
   *
   * @param row_stride: stride information
   *
   * @param width: width, 必须大于1, 如果是奇数, 将减1
   *
   * @param height: height, 必须大于1, 如果是奇数, 将减1
   *
   * @param  is_vertical_flip: 是否垂直翻转, 0不翻转, 1翻转
   *
   * @param  is_horizontal_flip：是否水平翻转, 0不翻转, 1翻转
   *
   * @param  scale_width: 缩放宽，必须是偶数, 0或负数不缩放
   *
   * @param  scale_height: 缩放高, 必须是偶数, 0或负数不缩放
   *
   * @param  scale_filter_mode: 缩放质量, 传0使用默认速度,可选等级范围是:[1,3],值越大缩放质量越好, 但速度越慢
   *
   * @param  rotation_degree: 顺时针旋转, 必须是0, 90, 180, 270, 注意:旋转是在缩放, 垂直/水品反转之后再做, 请留意顺序
   *
   * @return {0} if successful
   */
  public native int PostLayerImageRGBA8888ByteBuffer(long handle, int index, int left, int top,
                       ByteBuffer rgba_plane, int offset, int row_stride, int width, int height,
                       int is_vertical_flip,  int is_horizontal_flip,
                       int scale_width,  int scale_height, int scale_filter_mode,
                       int rotation_degree);


  /**
   * 投递层RGBA8888图像, 详细说明请参考PostLayerImageRGBA8888ByteBuffer
   *
   * @return {0} if successful
   */
  public native int PostLayerImageRGBA8888ByteArray(long handle, int index, int left, int top,
                            byte[] rgba_plane, int offset, int row_stride, int width, int height,
                            int is_vertical_flip,  int is_horizontal_flip,
                            int scale_width,  int scale_height, int scale_filter_mode,
                            int rotation_degree);

NT_PB_ExternalVideoFrameLayerConfig external_layer_c1 = new NT_PB_ExternalVideoFrameLayerConfig();

external_layer_c1.base_.type_ = (Int32)NTSmartPublisherDefine.NT_PB_E_LAYER_TYPE.NT_PB_E_LAYER_TYPE_EXTERNAL_VIDEO_FRAME;
external_layer_c1.base_.index_ = 0;
external_layer_c1.base_.enable_ = 1;
external_layer_c1.base_.region_.x_ = 0;
external_layer_c1.base_.region_.y_ = 0;
external_layer_c1.base_.region_.width_ = video_width_;
external_layer_c1.base_.region_.height_ = video_height_;

external_layer_c1.base_.offset_ = Marshal.OffsetOf(external_layer_c1.GetType(), "base_").ToInt32();
external_layer_c1.base_.cb_size_ = (uint)Marshal.SizeOf(external_layer_c1);

IntPtr external_layer_conf = Marshal.AllocHGlobal(Marshal.SizeOf(external_layer_c1));

Marshal.StructureToPtr(external_layer_c1, external_layer_conf, true);

UInt32 external_r = NTSmartPublisherSDK.NT_PB_AddLayerConfig(publisher_handle_, 0,
                                                             external_layer_conf, (int)NTSmartPublisherDefine.NT_PB_E_LAYER_TYPE.NT_PB_E_LAYER_TYPE_EXTERNAL_VIDEO_FRAME,
                                                             0, IntPtr.Zero);

Marshal.FreeHGlobal(external_layer_conf);

/*
         * 给index层投递Image数据，目前主要是用来把rgb和yuv视频数据传给相关层
         * reserve: 保留字段，请传0
         * index: 层索引
         * image: 图像
         * flag: 请传0
         * pReserve: 保留字段，请传0
         * 
         * 成功返回 NT_ERC_OK
     */
[DllImport("SmartPublisherSDK", EntryPoint = "NT_PB_PostLayerImage", CallingConvention = CallingConvention.StdCall)]
        public static extern UInt32 NT_PB_PostLayerImage(IntPtr handle, Int32 reserve,
                                                         Int32 index, IntPtr image,
                                                         UInt32 flag, IntPtr pReserve);