endptr.c

CMU大名鼎鼎的SPHINX－3大词汇量连续语音识别系统

 /* ====================================================================
 * Copyright (c) 2004 Carnegie Mellon University.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 *
 */

/*************************************************
 * CMU CALO Speech Project
 *
 * Copyright (c) 2004 Carnegie Mellon University.
 * ALL RIGHTS RESERVED.
 * **********************************************
 *
 * 11-Jul-2004  Ziad Al Bawab ([e-mail]) at Carnegie Mellon University
 * Created
 */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h> 

#include "endptr.h"

endpointer_t * endpointer_initialize(fe_t *FE)
{

        endpointer_t *ENDPTR = (endpointer_t *) calloc(1,sizeof(endpointer_t));

        /* set the fixed specifications */

        ENDPTR->PAD_F_BEFORE = (int)(PAD_T_BEFORE * FE->SAMPLING_RATE / FE->FRAME_SHIFT + 0.5);
        ENDPTR->PAD_F_AFTER  = (int)(PAD_T_AFTER * FE->SAMPLING_RATE / FE->FRAME_SHIFT + 0.5);
        ENDPTR->UTT_F_START  = (int)(UTT_T_START * FE->SAMPLING_RATE / FE->FRAME_SHIFT + 0.5);
        ENDPTR->UTT_F_END    = (int)(UTT_T_END * FE->SAMPLING_RATE / FE->FRAME_SHIFT + 0.5);
        ENDPTR->UTT_F_CANCEL = (int)(UTT_T_CANCEL * FE->SAMPLING_RATE / FE->FRAME_SHIFT + 0.5);

	/* set the rest specifications */

        ENDPTR->status = STAT_OTHER;
        ENDPTR->leader = ENDPTR->spbegin = ENDPTR->spend = ENDPTR->trailer = 0;

	ENDPTR->utt_counter = 0;	

        return (ENDPTR);
}

void endpointer_free(endpointer_t *ENDPTR)
{
  if(ENDPTR)
    ckd_free(ENDPTR);
}

void endpointer_update_stat (endpointer_t *ENDPTR, fe_t *FE, class_t *CLASSW, int class)
{
  
	switch (ENDPTR->status)
       	{
		case STAT_OTHER:
				// we are in the non-speech region and we received a speech frame
				if (class == CLASS_O)
				{
					ENDPTR->status = STAT_BEGIN;
					ENDPTR->spbegin = FE->FRAME_COUNTER - CLASSW->classlatency;
					ENDPTR->leader = ENDPTR->spbegin - ENDPTR->PAD_F_BEFORE;
					ENDPTR->utt_counter++;

					printf("Utt_Start#%d, Leader: %6.5f,  Begin: %6.5f\n", ENDPTR->utt_counter,endptr_frame2secs_beg( FE,ENDPTR->leader), endptr_frame2secs_beg(FE, ENDPTR->spbegin) ); 
				}
                        	break;

                case STAT_BEGIN:
				// we are in the speech region but still not enough frames to annouce
				// start of utterance	
				if ((class == CLASS_O) && ((FE->FRAME_COUNTER - ENDPTR->spbegin) < 
										ENDPTR->UTT_F_START))
                                {
					// do nothing for now	
				}

				// we are ready to start the utterance
				else if (class == CLASS_O)
				{
					ENDPTR->status = STAT_SPEECH;
				}

				// we were beginning to get speech and suddenly we get a non-speech frame
				else
				{
					ENDPTR->status = STAT_CANCEL;
					ENDPTR->spend = FE->FRAME_COUNTER - 1 - CLASSW->classlatency;
				}
                        	break;

                case STAT_SPEECH:
				if (class != CLASS_O)
				{
					ENDPTR->status = STAT_END; 
                                        ENDPTR->spend = FE->FRAME_COUNTER - 1 - CLASSW->classlatency;
					ENDPTR->trailer = ENDPTR->spend + ENDPTR->PAD_F_AFTER;

				}
                        	break;
                case STAT_END:
				// we thought we are ending the utterance and we get a speech frame
				if (class == CLASS_O)
				{
					ENDPTR->status = STAT_SPEECH;	
				}

				// still not enough non-speech frames to end the utterance	
				else if ((FE->FRAME_COUNTER - ENDPTR->spend) < ENDPTR->UTT_F_END)
				{			
					// do nothing for now
				}

				// enough non-speech frames to end utterance
				else
				{
					ENDPTR->status = STAT_OTHER;
					printf("Utt_End#%d, End: %6.5f,  Trailer: %6.5f\n", ENDPTR->utt_counter,endptr_frame2secs_end(FE, ENDPTR->spend), endptr_frame2secs_end(FE, ENDPTR->trailer));
				//	printf("Utt_End End: %d,  Trailer: %d\n",ENDPTR->spend, ENDPTR->trailer);
				}
                        	break;

                case STAT_CANCEL:
				// we wanted to cancel and boom we get another speech frame!	
				if (class == CLASS_O)
                                {
                                        ENDPTR->status = STAT_BEGIN;    
                                }

				// still not enough non-speech frames to cancel the utterance
                                else if ((FE->FRAME_COUNTER - ENDPTR->spend) < ENDPTR->UTT_F_CANCEL)
                                {                        
                                        // do nothing for now 
                                }

                                // enough non-speech frames to end utterance
                                else
                                {
                                        ENDPTR->status = STAT_OTHER;
					printf("Utt_Cancel#%d End: %6.5f\n", ENDPTR->utt_counter,endptr_frame2secs_end(FE, ENDPTR->spend));
				//	printf("Utt_Cancel End: %d\n",ENDPTR->spend);
						
					ENDPTR->utt_counter--;
                                }
                                break;

       }

}

float endptr_frame2secs_beg (fe_t *FE, int frame)
{
	return ( (float)(frame - 1) * FE->FRAME_SHIFT / FE->SAMPLING_RATE);

}

float endptr_frame2secs_end (fe_t *FE, int frame)
{
        return ( (float)((frame - 1) * FE->FRAME_SHIFT + FE->FRAME_SIZE) / FE->SAMPLING_RATE);

}