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【核心代码】 public interface CameraSource {  static final String LOG_TAG = "camera";  /**  * Open the camera source for subsequent use via calls to capture().  *   * @return true if the camera source was successfully opened.  */  boolean open();  /**  * Close the camera source. Calling close on a closed CameraSource is  * permitted but has no effect. The camera source may be reopened after  * being closed.  */  void close();  /**  * The width of the captured image.  *   * @return the width of the capture in pixels  */  int getWidth();  /**  * The height of the captured image.  *   * @return the height of the capture in pixels  */  int getHeight();  /**  * Attempts to render the current camera view onto the supplied canvas.  * The capture will be rendered into the rectangle (0,0,width,height).  * Outstanding transformations on the canvas may alter this.  *   * @param canvas the canvas to which the captured pixel data will be written  * @return true iff a frame was successfully written to the canvas  */  boolean capture(Canvas canvas);  boolean saveImage(String savePath, String fileName); }

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    android平台下海康接口并不好找，本人也是费了好大力气才找到，接口使用文档更是少之又少，本工程实现视频监控的同时，并成功应用OSD功能添加字幕显示，现将本工程开源出来供大家研究。

# 1、简介离线命令词识别，是基于语法规则，将与语法一致的自然语言音频转换为文本输出的技术。语法识别的结果值域只在语法文件所列出的规则里，故有很好的匹配率，另外，语法识别结果携带了结果的置信度，应用可以根据置信分数，决定这个结果是否有效。