mdef.c

WinCE平台上的语音识别程序

    ciphone_add(m, word, p);
    ci = (s3cipid_t) p;

    /* Read and skip "-" for lc, rc, wpos */
    for (n = 0; n < 3; n++) {
        if ((sscanf(lp, "%s%n", word, &wlen) != 1)
            || (strcmp(word, "-") != 0))
            E_FATAL("Bad context info for base phone: %s\n", line);
        lp += wlen;
    }

    /* Read filler attribute, if present */
    if (sscanf(lp, "%s%n", word, &wlen) != 1)
        E_FATAL("Missing filler atribute field: %s\n", line);
    lp += wlen;
    if (strcmp(word, "filler") == 0)
        m->ciphone[(int) ci].filler = 1;
    else if (strcmp(word, "n/a") == 0)
        m->ciphone[(int) ci].filler = 0;
    else
        E_FATAL("Bad filler attribute field: %s\n", line);

    triphone_add(m, ci, BAD_S3CIPID, BAD_S3CIPID, WORD_POSN_UNDEFINED, p);

    /* Parse remainder of line: transition matrix and state->senone mappings */
    parse_tmat_senmap(m, line, lp - line, p);
}


static void
parse_tri_line(mdef_t * m, char *line, s3pid_t p)
{
    int32 wlen;
    char word[1024], *lp;
    s3cipid_t ci, lc, rc;
    word_posn_t wpos = WORD_POSN_BEGIN;

    lp = line;

    /* Read base phone name */
    if (sscanf(lp, "%s%n", word, &wlen) != 1)
        E_FATAL("Missing base phone name: %s\n", line);
    lp += wlen;

    ci = mdef_ciphone_id(m, word);
    if (NOT_S3CIPID(ci))
        E_FATAL("Unknown base phone: %s\n", line);

    /* Read lc */
    if (sscanf(lp, "%s%n", word, &wlen) != 1)
        E_FATAL("Missing left context: %s\n", line);
    lp += wlen;
    lc = mdef_ciphone_id(m, word);
    if (NOT_S3CIPID(lc))
        E_FATAL("Unknown left context: %s\n", line);

    /* Read rc */
    if (sscanf(lp, "%s%n", word, &wlen) != 1)
        E_FATAL("Missing right context: %s\n", line);
    lp += wlen;
    rc = mdef_ciphone_id(m, word);
    if (NOT_S3CIPID(rc))
        E_FATAL("Unknown right  context: %s\n", line);

    /* Read tripone word-position within word */
    if ((sscanf(lp, "%s%n", word, &wlen) != 1) || (word[1] != '\0'))
        E_FATAL("Missing or bad word-position spec: %s\n", line);
    lp += wlen;
    switch (word[0]) {
    case 'b':
        wpos = WORD_POSN_BEGIN;
        break;
    case 'e':
        wpos = WORD_POSN_END;
        break;
    case 's':
        wpos = WORD_POSN_SINGLE;
        break;
    case 'i':
        wpos = WORD_POSN_INTERNAL;
        break;
    default:
        E_FATAL("Bad word-position spec: %s\n", line);
    }

    /* Read filler attribute, if present.  Must match base phone attribute */
    if (sscanf(lp, "%s%n", word, &wlen) != 1)
        E_FATAL("Missing filler attribute field: %s\n", line);
    lp += wlen;
    if (((strcmp(word, "filler") == 0) && (m->ciphone[(int) ci].filler)) ||
        ((strcmp(word, "n/a") == 0) && (!m->ciphone[(int) ci].filler))) {
        /* Everything is fine */
    }
    else
        E_FATAL("Bad filler attribute field: %s\n", line);

    triphone_add(m, ci, lc, rc, wpos, p);

    /* Parse remainder of line: transition matrix and state->senone mappings */
    parse_tmat_senmap(m, line, lp - line, p);
}


static void
sseq_compress(mdef_t * m)
{
    hash_table_t *h;
    s3senid_t **sseq;
    int32 n_sseq;
    int32 p, j, k;
    glist_t g;
    gnode_t *gn;
    hash_entry_t *he;

    k = m->n_emit_state * sizeof(s3senid_t);

    h = hash_table_new(m->n_phone, HASH_CASE_YES);
    n_sseq = 0;

    /* Identify unique senone-sequence IDs.  BUG: tmat-id not being considered!! */
    for (p = 0; p < m->n_phone; p++) {
        /* Add senone sequence to hash table */
	if ((j = (int32)
             hash_table_enter_bkey(h, (char *) (m->sseq[p]), k,
				   (void *)n_sseq)) == n_sseq)
            n_sseq++;

        m->phone[p].ssid = j;
    }

    /* Generate compacted sseq table */
    sseq = (s3senid_t **) ckd_calloc_2d(n_sseq, m->n_emit_state, sizeof(s3senid_t));    /* freed in mdef_free() */

    g = hash_table_tolist(h, &j);
    assert(j == n_sseq);

    for (gn = g; gn; gn = gnode_next(gn)) {
        he = (hash_entry_t *) gnode_ptr(gn);
        j = (int32)hash_entry_val(he);
        memcpy(sseq[j], hash_entry_key(he), k);
    }
    glist_free(g);

    /* Free the old, temporary senone sequence table, replace with compacted one */
    ckd_free_2d((void **) m->sseq);
    m->sseq = sseq;
    m->n_sseq = n_sseq;

    hash_table_free(h);
}


static int32
noncomment_line(char *line, int32 size, FILE * fp)
{
    while (fgets(line, size, fp) != NULL) {
        if (line[0] != '#')
            return 0;
    }
    return -1;
}


/*
 * Initialize phones (ci and triphones) and state->senone mappings from .mdef file.
 */
mdef_t *
mdef_init(char *mdeffile, int32 breport)
{
    FILE *fp;
    int32 n_ci, n_tri, n_map, n;
    char tag[1024], buf[1024];
    s3senid_t **senmap;
    s3pid_t p;
    int32 s, ci, cd;
    mdef_t *m;

    if (!mdeffile)
        E_FATAL("No mdef-file\n");

    if (breport)
        E_INFO("Reading model definition: %s\n", mdeffile);

    m = (mdef_t *) ckd_calloc(1, sizeof(mdef_t));       /* freed in mdef_free */

    if ((fp = fopen(mdeffile, "r")) == NULL)
        E_FATAL_SYSTEM("fopen(%s,r) failed\n", mdeffile);

    if (noncomment_line(buf, sizeof(buf), fp) < 0)
        E_FATAL("Empty file: %s\n", mdeffile);

    if (strncmp(buf, "BMDF", 4) == 0 || strncmp(buf, "FDMB", 4) == 0) {
        E_INFO
            ("Found byte-order mark %.4s, assuming this is a binary mdef file\n",
             buf);
        fclose(fp);
        ckd_free(m);
        return NULL;
    }
    if (strncmp(buf, MODEL_DEF_VERSION, strlen(MODEL_DEF_VERSION)) != 0)
        E_FATAL("Version error: Expecing %s, but read %s\n",
                MODEL_DEF_VERSION, buf);

    /* Read #base phones, #triphones, #senone mappings defined in header */
    n_ci = -1;
    n_tri = -1;
    n_map = -1;
    m->n_ci_sen = -1;
    m->n_sen = -1;
    m->n_tmat = -1;
    do {
        if (noncomment_line(buf, sizeof(buf), fp) < 0)
            E_FATAL("Incomplete header\n");

        if ((sscanf(buf, "%d %s", &n, tag) != 2) || (n < 0))
            E_FATAL("Error in header: %s\n", buf);

        if (strcmp(tag, "n_base") == 0)
            n_ci = n;
        else if (strcmp(tag, "n_tri") == 0)
            n_tri = n;
        else if (strcmp(tag, "n_state_map") == 0)
            n_map = n;
        else if (strcmp(tag, "n_tied_ci_state") == 0)
            m->n_ci_sen = n;
        else if (strcmp(tag, "n_tied_state") == 0)
            m->n_sen = n;
        else if (strcmp(tag, "n_tied_tmat") == 0)
            m->n_tmat = n;
        else
            E_FATAL("Unknown header line: %s\n", buf);
    } while ((n_ci < 0) || (n_tri < 0) || (n_map < 0) ||
             (m->n_ci_sen < 0) || (m->n_sen < 0) || (m->n_tmat < 0));

    if ((n_ci == 0) || (m->n_ci_sen == 0) || (m->n_tmat == 0)
        || (m->n_ci_sen > m->n_sen))
        E_FATAL("%s: Error in header\n", mdeffile);

    /* Check typesize limits */
    if (n_ci >= MAX_S3CIPID)
        E_FATAL("%s: #CI phones (%d) exceeds limit (%d)\n", mdeffile, n_ci,
                MAX_S3CIPID);
    if (n_ci + n_tri >= MAX_S3PID)
        E_FATAL("%s: #Phones (%d) exceeds limit (%d)\n", mdeffile,
                n_ci + n_tri, MAX_S3PID);
    if (m->n_sen >= MAX_S3SENID)
        E_FATAL("%s: #senones (%d) exceeds limit (%d)\n", mdeffile,
                m->n_sen, MAX_S3SENID);
    if (m->n_tmat >= MAX_S3TMATID)
        E_FATAL("%s: #tmats (%d) exceeds limit (%d)\n", mdeffile,
                m->n_tmat, MAX_S3TMATID);

    m->n_emit_state = (n_map / (n_ci + n_tri)) - 1;
    if ((m->n_emit_state + 1) * (n_ci + n_tri) != n_map)
        E_FATAL
            ("Header error: n_state_map not a multiple of n_ci*n_tri\n");

    /* Initialize ciphone info */
    m->n_ciphone = n_ci;
    m->ciphone_ht = hash_table_new(n_ci, 1);  /* With case-insensitive string names *//* freed in mdef_free */
    m->ciphone = (ciphone_t *) ckd_calloc(n_ci, sizeof(ciphone_t));     /* freed in mdef_free */

    /* Initialize phones info (ciphones + triphones) */
    m->n_phone = n_ci + n_tri;
    m->phone = (phone_t *) ckd_calloc(m->n_phone, sizeof(phone_t));     /* freed in mdef_free */

    /* Allocate space for state->senone map for each phone */
    senmap = (s3senid_t **) ckd_calloc_2d(m->n_phone, m->n_emit_state, sizeof(s3senid_t));      /* freed in mdef_free */
    m->sseq = senmap;           /* TEMPORARY; until it is compressed into just the unique ones */


    /**CODE DUPLICATION!*****************************************************************************************************/
    /* Flat decoder-specific */
    /* Allocate space for state->senone map for each phone */

    /* ARCHAN 20040820, this sacrifice readability and may cause pointer
       problems in future. However, this is a less evil than
       duplication of code.  This is trick point all the state mapping
       to the global mapping and avoid duplicated memory.  
     */

    /* S3 xwdpid_compress will compress the below list phone list. 
     */

    /* ARCHAN, this part should not be used when one of the recognizer is used. */
    m->st2senmap =
        (s3senid_t *) ckd_calloc(m->n_phone * m->n_emit_state,
                                 sizeof(s3senid_t));
    for (p = 0; p < m->n_phone; p++)
        m->phone[p].state = m->st2senmap + (p * m->n_emit_state);
    /******************************************************************************************************/


    /* Allocate initial space for <ci,lc,rc,wpos> -> pid mapping */
    m->wpos_ci_lclist = (ph_lc_t ***) ckd_calloc_2d(N_WORD_POSN, m->n_ciphone, sizeof(ph_lc_t *));      /* freed in mdef_free */

    /*
     * Read base phones and triphones.  They'll simply be assigned a running sequence
     * number as their "phone-id".  If the phone-id < n_ci, it's a ciphone.
     */

    /* Read base phones */
    for (p = 0; p < n_ci; p++) {
        if (noncomment_line(buf, sizeof(buf), fp) < 0)
            E_FATAL("Premature EOF reading CIphone %d\n", p);
        parse_base_line(m, buf, p);
    }
    m->sil = mdef_ciphone_id(m, S3_SILENCE_CIPHONE);

    /* Read triphones, if any */
    for (; p < m->n_phone; p++) {
        if (noncomment_line(buf, sizeof(buf), fp) < 0)
            E_FATAL("Premature EOF reading phone %d\n", p);
        parse_tri_line(m, buf, p);
    }

    if (noncomment_line(buf, sizeof(buf), fp) >= 0)
        E_ERROR("Non-empty file beyond expected #phones (%d)\n",
                m->n_phone);

    /* Build CD senones to CI senones map */
    if (m->n_ciphone * m->n_emit_state != m->n_ci_sen)
        E_FATAL
            ("#CI-senones(%d) != #CI-phone(%d) x #emitting-states(%d)\n",
             m->n_ci_sen, m->n_ciphone, m->n_emit_state);
    m->cd2cisen = (s3senid_t *) ckd_calloc(m->n_sen, sizeof(s3senid_t));        /* freed in mdef_free */

    m->sen2cimap = (s3cipid_t *) ckd_calloc(m->n_sen, sizeof(s3cipid_t));       /* freed in mdef_free */

    for (s = 0; s < m->n_sen; s++)
        m->sen2cimap[s] = BAD_S3CIPID;
    for (s = 0; s < m->n_ci_sen; s++) { /* CI senones */
        m->cd2cisen[s] = (s3senid_t) s;
        m->sen2cimap[s] = s / m->n_emit_state;
    }
    for (p = n_ci; p < m->n_phone; p++) {       /* CD senones */
        for (s = 0; s < m->n_emit_state; s++) {
            cd = m->sseq[p][s];
            ci = m->sseq[(int) m->phone[p].ci][s];
            m->cd2cisen[cd] = (s3senid_t) ci;
            m->sen2cimap[cd] = m->phone[p].ci;
        }
    }

    sseq_compress(m);
    fclose(fp);

    return m;
}

void
mdef_report(mdef_t * m)
{
    E_INFO_NOFN("Initialization of mdef_t, report:\n");
    E_INFO_NOFN
        ("%d CI-phone, %d CD-phone, %d emitstate/phone, %d CI-sen, %d Sen, %d Sen-Seq\n",
         m->n_ciphone, m->n_phone - m->n_ciphone, m->n_emit_state,
         m->n_ci_sen, m->n_sen, m->n_sseq);
    E_INFO_NOFN("\n");

}

void
mdef_sseq2sen_active(mdef_t * mdef, int32 * sseq, int32 * sen)
{
    int32 ss, i;
    s3senid_t *sp;

    for (ss = 0; ss < mdef_n_sseq(mdef); ss++) {
        if (sseq[ss]) {
            sp = mdef->sseq[ss];
            for (i = 0; i < mdef_n_emit_state(mdef); i++)
                sen[sp[i]] = 1;
        }
    }
}

/* RAH 4.23.01, Need to step down the ->next list to see if there are
   any more things to free
 */



/* RAH 4.19.01, Attempt to free memory that was allocated within this module
   I have not verified that all the memory has been freed. I've taken only a 
   reasonable effort for now.
   RAH 4.24.01 - verified that all memory is released.
 */
void
mdef_free_recursive_lc(ph_lc_t * lc)
{
    if (lc == NULL)
        return;

    if (lc->rclist)
        mdef_free_recursive_rc(lc->rclist);

    if (lc->next)
        mdef_free_recursive_lc(lc->next);

    ckd_free((void *) lc);
}

void
mdef_free_recursive_rc(ph_rc_t * rc)
{
    if (rc == NULL)
        return;

    if (rc->next)
        mdef_free_recursive_rc(rc->next);

    ckd_free((void *) rc);
}


/* RAH, Free memory that was allocated in mdef_init 
   Rational purify shows that no leaks exist
 */

void
mdef_free(mdef_t * m)
{
    int i, j;

    if (m) {
        if (m->sen2cimap)
            ckd_free((void *) m->sen2cimap);
        if (m->cd2cisen)
            ckd_free((void *) m->cd2cisen);

        /* RAH, go down the ->next list and delete all the pieces */
        for (i = 0; i < N_WORD_POSN; i++)
            for (j = 0; j < m->n_ciphone; j++)
                if (m->wpos_ci_lclist[i][j]) {
                    mdef_free_recursive_lc(m->wpos_ci_lclist[i][j]->next);
                    mdef_free_recursive_rc(m->wpos_ci_lclist[i][j]->
                                           rclist);
                }

        for (i = 0; i < N_WORD_POSN; i++)
            for (j = 0; j < m->n_ciphone; j++)
                if (m->wpos_ci_lclist[i][j])
                    ckd_free((void *) m->wpos_ci_lclist[i][j]);


        if (m->wpos_ci_lclist)
            ckd_free_2d((void *) m->wpos_ci_lclist);
        if (m->sseq)
            ckd_free_2d((void *) m->sseq);
        /* Free phone context */
        if (m->phone)
            ckd_free((void *) m->phone);
        if (m->ciphone_ht)
            hash_table_free(m->ciphone_ht);

        for (i = 0; i < m->n_ciphone; i++) {
            if (m->ciphone[i].name)
                ckd_free((void *) m->ciphone[i].name);
        }


        if (m->ciphone)
            ckd_free((void *) m->ciphone);

        if (m->st2senmap)
            ckd_free((void *) m->st2senmap);

        ckd_free((void *) m);
    }
}