text: /**********************************************************************************************/
  /* The MIT License                                                                            */
  /*                                                                                            */
  /* Copyright 2016-2017 Twitch Interactive, Inc. or its affiliates. All Rights Reserved.       */
  /*                                                                                            */
  /* Permission is hereby granted, free of charge, to any person obtaining a copy               */
  /* of this software and associated documentation files (the "Software"), to deal              */
  /* in the Software without restriction, including without limitation the rights               */
  /* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell                  */
  /* copies of the Software, and to permit persons to whom the Software is                      */
  /* furnished to do so, subject to the following conditions:                                   */
  /*                                                                                            */
  /* The above copyright notice and this permission notice shall be included in                 */
  /* all copies or substantial portions of the Software.                                        */
  /*                                                                                            */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR                 */
  /* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,                   */
  /* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE                */
  /* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER                     */
  /* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,              */
  /* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN                  */
  /* THE SOFTWARE.                                                                              */
  /**********************************************************************************************/
  // http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/CC_XDS.HTML#PR
  #include "xds.h"
  #include "caption.h"
  #include <string.h>
  
  void xds_init(xds_t* xds)
  {
      memset(xds, 0, sizeof(xds_t));
  }
  
  int xds_decode(xds_t* xds, uint16_t cc)
  {
      switch (xds->state) {
      default:
      case 0:
          xds_init(xds);
          xds->class_code = (cc & 0x0F00) >> 8;
          xds->type = (cc & 0x000F);
          xds->state = 1;
          return LIBCAPTION_OK;
  
      case 1:
          if (0x8F00 == (cc & 0xFF00)) {
              xds->checksum = (cc & 0x007F);
              xds->state = 0;
              return LIBCAPTION_READY;
          }
  
          if (xds->size < 32) {
              xds->content[xds->size + 0] = (cc & 0x7F00) >> 8;
              xds->content[xds->size + 1] = (cc & 0x007F);
              xds->size += 2;
              return LIBCAPTION_OK;
          }
      }
  
      xds->state = 0;
      return LIBCAPTION_ERROR;
  }
  