module.c

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/*
 * Copyright (c) 1991-2006 Kawahara Lab., Kyoto University
 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 * Copyright (c) 2005-2006 Julius project team, Nagoya Institute of Technology, Nagoya Institute of Technology
 * All rights reserved
 */

#include <julius.h>
#include <stdarg.h>

#define MAXBUFLEN 4096 
static int listen_sd = -1;      
static char mbuf[MAXBUFLEN];    


static boolean process_active = TRUE;

static boolean process_want_terminate = FALSE;

static boolean process_want_reload = FALSE;

#ifdef USE_DFA

enum{SM_TERMINATE, SM_PAUSE, SM_WAIT};
static short gram_switch_input_method = SM_PAUSE;
#endif

void
main_module_loop()
{
#if !defined(_WIN32) || defined(__CYGWIN32__)
  pid_t cid;
#endif
  
  /* prepare socket to listen */
  if ((listen_sd = ready_as_server(module_port)) < 0) {
    j_error("Error: failed to bind socket\n");
  }

  j_printf  ("
  j_printf  ("
  j_printf  ("
  j_printf  ("
  j_printf  ("

#if defined(_WIN32) && !defined(__CYGWIN32__)
  
  /* Win32: no fork, just wait for one connection and proceed */
  if ((module_sd = accept_from(listen_sd)) < 0) {
    j_error("Error: failed to accept connection\n");
  }
  /* call main recognition loop here */
  main_recognition_loop();
 
#else

  /* server loop */
  for(;;) {
    /* accept connection from a client */
    if ((module_sd = accept_from(listen_sd)) < 0) {
      j_error("Error: failed to accept connection\n");
    }
    /* fork this process */
    if ((cid = fork()) != 0) {
      /* parent process */
      j_printf("
      close_socket(module_sd); /* parent not need socket to the client */
      continue;
    }
    /* child not need listen socket */
    close_socket(listen_sd);
    /* call main recognition loop here */
    main_recognition_loop();
  }

#endif
}

boolean
module_disconnect()
{
  if (close_socket(module_sd) < 0) return FALSE;
  module_sd = -1;
  return TRUE;
}

boolean
module_is_connected()
{
  if (module_sd < 0) return FALSE;
  return TRUE;
}


/*
  MSOCK_COMMAND_DIE ,    exit program 
  MSOCK_COMMAND_PAUSE ,  stop recog. keeping the current input 
  MSOCK_COMMAND_TERMINATE , stop recog. dropping the current input 
  MSOCK_COMMAND_RESUME};         resume the stopped process 
*/

#ifdef USE_DFA
static boolean
msock_read_grammar(DFA_INFO **ret_dfa, WORD_INFO **ret_winfo)
{
  DFA_INFO *dfa;
  WORD_INFO *winfo;

  /* load grammar: dfa and dict in turn */
  dfa = dfa_info_new();
  if (!
#ifdef WINSOCK
      rddfa_sd(module_sd, dfa)
#else
      rddfa_fd(module_sd, dfa)
#endif
      ) {
    return FALSE;
  }
  winfo = word_info_new();
  /* ignore MONOTREE */
  if (!
#ifdef WINSOCK
      voca_load_htkdict_sd(module_sd, winfo, hmminfo, FALSE)
#else
      voca_load_htkdict_fd(module_sd, winfo, hmminfo, FALSE)
#endif
      ) {
    dfa_info_free(dfa);
    return FALSE;
  }
  *ret_dfa = dfa;
  *ret_winfo = winfo;
  return TRUE;
}

static void
set_grammar_switch_timing_flag()
{
  if (process_active) {
    /* if recognition is currently running, tell engine how/when to
       re-construct global lexicon. */
    switch(gram_switch_input_method) {
    case SM_TERMINATE:  /* discard input now and change (immediate) */
      process_want_terminate = TRUE;
      process_want_reload = TRUE;
      break;
    case SM_PAUSE:              /* segment input now, recognize it, and then change */
      process_want_terminate = FALSE;
      process_want_reload = TRUE;
      break;
    case SM_WAIT:               /* wait until the current input end and recognition completed */
      process_want_terminate = FALSE;
      process_want_reload = FALSE;
      break;
    }
    /* After the update, recognition will restart without sleeping. */
  } else {
    /* If recognition is currently not running, the received
       grammars are merely stored in memory here.  The re-construction of
       global lexicon will be delayed: it will be re-built just before
       the recognition process starts next time. */
  }
}
#endif

void
msock_exec_command(char *command)
{
#ifdef USE_DFA
  DFA_INFO *new_dfa;
  WORD_INFO *new_winfo;
  static char *buf = NULL, *p, *q;
  int gid;
  char namebuf[MAXGRAMNAMELEN];

  if (buf == NULL) buf = mymalloc(MAXBUFLEN);
#endif

  /* prompt the received command string */
  j_printf("[[%s]]\n",command);

  if (strmatch(command, "STATUS")) {
    /* return status */
    if (process_active) {
      module_send(module_sd, "<SYSINFO PROCESS=\"ACTIVE\"/>\n.\n");
    } else {
      module_send(module_sd, "<SYSINFO PROCESS=\"SLEEP\"/>\n.\n");
    }
  } else if (strmatch(command, "DIE")) {
#if defined(_WIN32) && !defined(__CYGWIN32__)
    /* Win32: this is single process and has not forked, so
       we just disconnect the connection here.  */
    module_disconnect();
#else
    /* Unix: this is a forked process, so exit here. */
    module_disconnect();
    j_exit();
#endif
  } else if (strmatch(command, "VERSION")) {
    /* return version */
    module_send(module_sd, "<ENGINEINFO TYPE=\"%s\" VERSION=\"%s\" CONF=\"%s\"/>\n.\n",
                PRODUCTNAME, VERSION, SETUP);
  } else if (strmatch(command, "PAUSE")) {
    /* pause recognition: will stop when the current input ends */
    if (process_active) {
      process_want_terminate = FALSE;
      process_want_reload = TRUE;
      process_active = FALSE;
    }
    if (speech_input == SP_ADINNET) {
      /* when taking speech from adinnet client,
         always tell the client to stop recording */
      adin_tcpip_send_pause();
    }
  } else if (strmatch(command, "TERMINATE")) {
    /* terminate recognition: input will terminate immidiately */
    /* set flags to stop adin to terminate immediately, and
       stop process */
    if (process_active) {
      process_want_terminate = TRUE;
      process_want_reload = TRUE;
      process_active = FALSE;
    }
    if (speech_input == SP_ADINNET) {
      /* when taking speech input from adinnet client,
         always tell the client to stop recording immediately */
      adin_tcpip_send_terminate();
    }
  } else if (strmatch(command, "RESUME")) {
    /* restart the paused/terminated recognition process */
    if (process_active == FALSE) {
      process_want_terminate = FALSE;
      process_active = TRUE;
    }
    if (speech_input == SP_ADINNET) {
      /* when taking speech from adinnet client,
         tell the client to restart recording */
      adin_tcpip_send_resume();
    }
#ifdef USE_DFA
  } else if (strmatch(command, "INPUTONCHANGE")) {
    /* change grammar switching timing policy */
    if (
#ifdef WINSOCK
        getl_sd(buf, MAXBUFLEN, module_sd)
#else   
        getl_fd(buf, MAXBUFLEN, module_sd)
#endif
        == NULL) {
      j_error("Error: msock(INPUTONCHANGE): no argument\n");
    }
    if (strmatch(buf, "TERMINATE")) {
      gram_switch_input_method = SM_TERMINATE;
    } else if (strmatch(buf, "PAUSE")) {
      gram_switch_input_method = SM_PAUSE;
    } else if (strmatch(buf, "WAIT")) {
      gram_switch_input_method = SM_WAIT;
    } else {
      j_error("Error: msock(INPUTONCHANGE): unknown method [%s]\n", buf);
    }
  } else if (strnmatch(command, "CHANGEGRAM", strlen("CHANGEGRAM"))) {
    /* receive grammar (DFA + DICT) from the socket, and swap the whole grammar  */
    /* read grammar name if any */
    p = &(command[strlen("CHANGEGRAM")]);
    while (*p == ' ' && *p != '\r' && *p != '\n' && *p != '\0') p++;
    if (*p != '\r' && *p != '\n' && *p != '\0') {
      q = buf;
      while (*p != ' ' && *p != '\r' && *p != '\n' && *p != '\0') *q++ = *p++;
      *q = '\0';
      p = buf;
    } else {
      p = NULL;
    }
    /* read a new grammar via socket */
    if (msock_read_grammar(&new_dfa, &new_winfo) == FALSE) {
      module_send(module_sd, "<GRAMMAR STATUS=\"ERROR\" REASON=\"WRONG DATA\"/>\n.\n");
    } else {
      /* delete all existing grammars */
      multigram_delete_all();
      /* register the new grammar to multi-gram tree */
      multigram_add(new_dfa, new_winfo, p);
      /* need to rebuild the global lexicon */
      /* set engine flag to tell how to switch the grammar when active */
      set_grammar_switch_timing_flag();
      module_send(module_sd, "<GRAMMAR STATUS=\"RECEIVED\"/>\n.\n");
    }
  } else if (strnmatch(command, "ADDGRAM", strlen("ADDGRAM"))) {
    /* receive grammar and add it to the current grammars */
    /* read grammar name if any */
    p = &(command[strlen("ADDGRAM")]);
    while (*p == ' ' && *p != '\r' && *p != '\n' && *p != '\0') p++;
    if (*p != '\r' && *p != '\n' && *p != '\0') {
      q = buf;
      while (*p != ' ' && *p != '\r' && *p != '\n' && *p != '\0') *q++ = *p++;
      *q = '\0';
      p = buf;
    } else {
      p = NULL;
    }
    /* read a new grammar via socket */
    if (msock_read_grammar(&new_dfa, &new_winfo) == FALSE) {
      module_send(module_sd, "<GRAMMAR STATUS=\"ERROR\" REASON=\"WRONG DATA\"/>\n.\n");
    } else {
      /* add it to multi-gram tree */
      multigram_add(new_dfa, new_winfo, p);
      /* need to rebuild the global lexicon */
      /* set engine flag to tell how to switch the grammar when active */
      set_grammar_switch_timing_flag();
      module_send(module_sd, "<GRAMMAR STATUS=\"RECEIVED\"/>\n.\n");
    }
  } else if (strmatch(command, "DELGRAM")) {
    /* remove the grammar specified by ID */
    /* read a list of grammar IDs to be deleted */
    if (
#ifdef WINSOCK
        getl_sd(buf, MAXBUFLEN, module_sd)
#else
        getl_fd(buf, MAXBUFLEN, module_sd)
#endif
        == NULL) {
      j_error("Error: msock(DELGRAM): no argument\n");
    }
    /* extract IDs and mark them as delete
       (actual deletion will be performed on the next 
    */
    for(p=strtok(buf," ");p;p=strtok(NULL," ")) {
      gid = atoi(p);
      if (multigram_delete(gid) == FALSE) { /* deletion marking failed */
        j_printerr("Warning: msock(DELGRAM): gram #%d failed to delete, ignored\n", gid);
      }
    }
    /* need to rebuild the global lexicon */
    /* set engine flag to tell how to switch the grammar when active */
    set_grammar_switch_timing_flag();
  } else if (strmatch(command, "ACTIVATEGRAM")) {
    /* activate grammar in this engine */
    /* read a list of grammar IDs to be activated */
    if (
#ifdef WINSOCK
        getl_sd(buf, MAXBUFLEN, module_sd)
#else
        getl_fd(buf, MAXBUFLEN, module_sd)
#endif
        == NULL) {
      j_error("Error: msock(ACTIVATEGRAM): no argument\n");
    }
    /* mark them as active */
    for(p=strtok(buf," ");p;p=strtok(NULL," ")) {
      gid = atoi(p);
      multigram_activate(gid);
    }
    /* tell engine when to change active status */
    set_grammar_switch_timing_flag();
  } else if (strmatch(command, "DEACTIVATEGRAM")) {
    /* deactivate grammar in this engine */
    /* read a list of grammar IDs to be de-activated */
    if (
#ifdef WINSOCK
        getl_sd(buf, MAXBUFLEN, module_sd)
#else
        getl_fd(buf, MAXBUFLEN, module_sd)
#endif
        == NULL) {
      j_error("Error: msock(DEACTIVATEGRAM): no argument\n");
    }
    /* mark them as not active */
    for(p=strtok(buf," ");p;p=strtok(NULL," ")) {
      gid = atoi(p);
      multigram_deactivate(gid);
    }
    /* tell engine when to change active status */
    set_grammar_switch_timing_flag();
  } else if (strmatch(command, "SYNCGRAM")) {
    /* update grammar if necessary */
    multigram_exec();
    module_send(module_sd, "<GRAMMAR STATUS=\"READY\"/>\n.\n");
#endif
  }
}


boolean
module_is_active()
{
  return process_active;
}

boolean
module_wants_terminate()
{
  return process_want_terminate;
}

void
module_reset_reload()
{
  process_want_reload = FALSE;
}

void
msock_process_command()
{
  if (
#ifdef WINSOCK
      getl_sd(mbuf, MAXBUFLEN, module_sd)
#else
      getl_fd(mbuf, MAXBUFLEN, module_sd)
#endif
      != NULL) {
    msock_exec_command(mbuf);
  }
}

void
msock_check_and_process_command()
{
  fd_set rfds;
  int ret;
  struct timeval tv;

  /* check if some commands are waiting in queue */
  FD_ZERO(&rfds);
  FD_SET(module_sd, &rfds);
  tv.tv_sec = 0;
  tv.tv_usec = 0;             /* 0 msec timeout: return immediately */
  ret = select(module_sd+1, &rfds, NULL, NULL, &tv);
  if (ret < 0) {
    perror("msock_check_and_process_command: cannot poll\n");
  }
  if (ret > 0) {
    /* there is data to read */
    /* process command and change status if necessaty */
    while(select(module_sd+1, &rfds, NULL, NULL, &tv) > 0 &&
#ifdef WINSOCK
          getl_sd(mbuf, MAXBUFLEN, module_sd)
#else
          getl_fd(mbuf, MAXBUFLEN, module_sd)
#endif
          != NULL) {
      msock_exec_command(mbuf);
    }
  }
}

int
msock_check_in_adin()
{
  if (module_is_connected()) {
    /* module: check command and terminate recording when requested */
    msock_check_and_process_command();
    /* With audio input via adinnet, TERMINATE command will issue terminate
       command to the adinnet client.  The client then stops recording
       immediately and return end-of-segment ack.  Then it will cause this
       process to stop recognition as normal.  So we need not to
       perform immediate termination at this callback, but just ignore the
       results in the main.c.  */
    if (module_wants_terminate() /* TERMINATE ... force termination */
        && speech_input != SP_ADINNET) {
      return(-2);
    }
    if (process_want_reload) {
      return(-1);
    }
  }
  return(0);
}

---