text: /**********************************************************************************************/
  /* The MIT License                                                                            */
  /*                                                                                            */
  /* Copyright 2016-2016 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.                                                                              */
  /**********************************************************************************************/
  #include <stdlib.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <linux/input.h>
  #include <string.h>
  #include <stdio.h>
  #include "caption.h"
  #include "flv.h"
  
  char charcode[] = {
      0,   0, '1', '2', '3', '4', '5', '6',  '7', '8', '9',  '0', '-', '=',   0,   0,
      'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',  'O', 'P', '[',  ']','\n',   0, 'A', 'S',
      'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', '\'', '`',   0, '\\', 'Z', 'X', 'C', 'V',
      'B', 'N', 'M', ',', '.', '/',   0, '*',    0, ' ',   0,    0,   0,   0,   0,   0,
  };
  
  int data_ready (int fd)
  {
      fd_set set;
      struct timeval timeout = {0,0};
      FD_ZERO (&set);
      FD_SET (fd,&set);
      int cnt = select (fd+1, &set, 0, 0, &timeout);
      FD_ZERO (&set);
      return (0 < cnt);
  }
  
  #define MAX_CAP_LENGTH (SCREEN_ROWS*SCREEN_COLS)
  int main (int argc, char** argv)
  {
      int fd;
      ssize_t n;
      flvtag_t tag;
      struct input_event ev;
      int has_audio, has_video;
      const char* dev = argv[1];
      char text[MAX_CAP_LENGTH+1];
      memset (text,0,MAX_CAP_LENGTH+1);
  
      FILE* flv = flv_open_read ("-");
      FILE* out = flv_open_write ("-");
      fd = open (dev, O_RDONLY);
  
      if (fd == -1) {
          fprintf (stderr, "Cannot open %s: %s.\n", dev, strerror (errno));
          return EXIT_FAILURE;
      }
  
      if (!flv_read_header (flv,&has_audio,&has_video)) {
          fprintf (stderr,"%s is not an flv file\n", argv[1]);
          return EXIT_FAILURE;
      }
  
      if (!flv_write_header (out,has_audio,has_video)) {
          return EXIT_FAILURE;
      }
  
      flvtag_init (&tag);
  
      while (flv_read_tag (flv,&tag)) {
          if (flvtag_avcpackettype_nalu == flvtag_avcpackettype (&tag)) {
              if (data_ready (fd)) {
                  n = read (fd, &ev, sizeof ev);
  
                  if (n == (ssize_t)-1) {
                      if (errno == EINTR) {
                          continue;
                      } else {
                          break;
                      }
                  } else if (n != sizeof ev) {
                      errno = EIO;
                      break;
                  }
  
                  int len = strlen (text);
                  char c = (EV_KEY == ev.type && 1 == ev.value && ev.code < 64) ? charcode[ev.code] : 0;
  
                  if (0 < len && '\n' == c) {
                      fprintf (stderr,"='%s'\n", text);
                      flvtag_addcaption (&tag, text);
                      memset (text,0,MAX_CAP_LENGTH+1);
                  } else if (0 != c && len < MAX_CAP_LENGTH) {
                      text[len] = c;
                  }
              }
          }
  
          flv_write_tag (out,&tag);
      }
  
      return EXIT_SUCCESS;
  }
  