Add m-esr52 at 52.6.0

1 files changed, 1377 insertions, 0 deletions

diff --git a/media/pocketsphinx/src/acmod.c b/media/pocketsphinx/src/acmod.c
new file mode 100644
index 000000000..ba039f70e
--- /dev/null
+++ b/media/pocketsphinx/src/acmod.c
@@ -0,0 +1,1377 @@
+/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* ====================================================================
+ * Copyright (c) 2008 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 work was supported in part by funding from the Defense Advanced
+ * Research Projects Agency and the National Science Foundation of the
+ * United States of America, and the CMU Sphinx Speech Consortium.
+ *
+ * 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.
+ *
+ * ====================================================================
+ *
+ */
+
+
+/**
+ * @file acmod.c Acoustic model structures for PocketSphinx.
+ * @author David Huggins-Daines <dhuggins@cs.cmu.edu>
+ */
+
+/* System headers. */
+#include <assert.h>
+#include <string.h>
+#include <math.h>
+
+/* SphinxBase headers. */
+#include <sphinxbase/prim_type.h>
+#include <sphinxbase/err.h>
+#include <sphinxbase/cmd_ln.h>
+#include <sphinxbase/strfuncs.h>
+#include <sphinxbase/byteorder.h>
+#include <sphinxbase/feat.h>
+#include <sphinxbase/bio.h>
+
+/* Local headers. */
+#include "cmdln_macro.h"
+#include "acmod.h"
+#include "s2_semi_mgau.h"
+#include "ptm_mgau.h"
+#include "ms_mgau.h"
+
+/* Feature and front-end parameters that may be in feat.params */
+static const arg_t feat_defn[] = {
+    waveform_to_cepstral_command_line_macro(),
+    cepstral_to_feature_command_line_macro(),
+    CMDLN_EMPTY_OPTION
+};
+
+#ifndef WORDS_BIGENDIAN
+#define WORDS_BIGENDIAN 1
+#endif
+
+static int32 acmod_process_mfcbuf(acmod_t *acmod);
+
+static int
+acmod_init_am(acmod_t *acmod)
+{
+    char const *mdeffn, *tmatfn, *mllrfn, *hmmdir;
+
+    /* Read model definition. */
+    if ((mdeffn = cmd_ln_str_r(acmod->config, "-mdef")) == NULL) {
+        if ((hmmdir = cmd_ln_str_r(acmod->config, "-hmm")) == NULL)
+            E_ERROR("Acoustic model definition is not specified either "
+                    "with -mdef option or with -hmm\n");
+        else
+            E_ERROR("Folder '%s' does not contain acoustic model "
+                    "definition 'mdef'\n", hmmdir);
+
+        return -1;
+    }
+
+    if ((acmod->mdef = bin_mdef_read(acmod->config, mdeffn)) == NULL) {
+        E_ERROR("Failed to read acoustic model definition from %s\n", mdeffn);
+        return -1;
+    }
+
+    /* Read transition matrices. */
+    if ((tmatfn = cmd_ln_str_r(acmod->config, "-tmat")) == NULL) {
+        E_ERROR("No tmat file specified\n");
+        return -1;
+    }
+    acmod->tmat = tmat_init(tmatfn, acmod->lmath,
+                            cmd_ln_float32_r(acmod->config, "-tmatfloor"),
+                            TRUE);
+
+    /* Read the acoustic models. */
+    if ((cmd_ln_str_r(acmod->config, "-mean") == NULL)
+        || (cmd_ln_str_r(acmod->config, "-var") == NULL)
+        || (cmd_ln_str_r(acmod->config, "-tmat") == NULL)) {
+        E_ERROR("No mean/var/tmat files specified\n");
+        return -1;
+    }
+
+    if (cmd_ln_str_r(acmod->config, "-senmgau")) {
+        E_INFO("Using general multi-stream GMM computation\n");
+        acmod->mgau = ms_mgau_init(acmod, acmod->lmath, acmod->mdef);
+        if (acmod->mgau == NULL)
+            return -1;
+    }
+    else {
+        E_INFO("Attempting to use PTM computation module\n");
+        if ((acmod->mgau = ptm_mgau_init(acmod, acmod->mdef)) == NULL) {
+            E_INFO("Attempting to use semi-continuous computation module\n");
+            if ((acmod->mgau = s2_semi_mgau_init(acmod)) == NULL) {
+                E_INFO("Falling back to general multi-stream GMM computation\n");
+                acmod->mgau = ms_mgau_init(acmod, acmod->lmath, acmod->mdef);
+                if (acmod->mgau == NULL)
+                    return -1;
+            }
+        }
+    }
+
+    /* If there is an MLLR transform, apply it. */
+    if ((mllrfn = cmd_ln_str_r(acmod->config, "-mllr"))) {
+        ps_mllr_t *mllr = ps_mllr_read(mllrfn);
+        if (mllr == NULL)
+            return -1;
+        acmod_update_mllr(acmod, mllr);
+    }
+
+    return 0;
+}
+
+static int
+acmod_init_feat(acmod_t *acmod)
+{
+    acmod->fcb =
+        feat_init(cmd_ln_str_r(acmod->config, "-feat"),
+                  cmn_type_from_str(cmd_ln_str_r(acmod->config,"-cmn")),
+                  cmd_ln_boolean_r(acmod->config, "-varnorm"),
+                  agc_type_from_str(cmd_ln_str_r(acmod->config, "-agc")),
+                  1, cmd_ln_int32_r(acmod->config, "-ceplen"));
+    if (acmod->fcb == NULL)
+        return -1;
+
+    if (cmd_ln_str_r(acmod->config, "-lda")) {
+        E_INFO("Reading linear feature transformation from %s\n",
+               cmd_ln_str_r(acmod->config, "-lda"));
+        if (feat_read_lda(acmod->fcb,
+                          cmd_ln_str_r(acmod->config, "-lda"),
+                          cmd_ln_int32_r(acmod->config, "-ldadim")) < 0)
+            return -1;
+    }
+
+    if (cmd_ln_str_r(acmod->config, "-svspec")) {
+        int32 **subvecs;
+        E_INFO("Using subvector specification %s\n",
+               cmd_ln_str_r(acmod->config, "-svspec"));
+        if ((subvecs = parse_subvecs(cmd_ln_str_r(acmod->config, "-svspec"))) == NULL)
+            return -1;
+        if ((feat_set_subvecs(acmod->fcb, subvecs)) < 0)
+            return -1;
+    }
+
+    if (cmd_ln_exists_r(acmod->config, "-agcthresh")
+        && 0 != strcmp(cmd_ln_str_r(acmod->config, "-agc"), "none")) {
+        agc_set_threshold(acmod->fcb->agc_struct,
+                          cmd_ln_float32_r(acmod->config, "-agcthresh"));
+    }
+
+    if (acmod->fcb->cmn_struct
+        && cmd_ln_exists_r(acmod->config, "-cmninit")) {
+        char *c, *cc, *vallist;
+        int32 nvals;
+
+        vallist = ckd_salloc(cmd_ln_str_r(acmod->config, "-cmninit"));
+        c = vallist;
+        nvals = 0;
+        while (nvals < acmod->fcb->cmn_struct->veclen
+               && (cc = strchr(c, ',')) != NULL) {
+            *cc = '\0';
+            acmod->fcb->cmn_struct->cmn_mean[nvals] = FLOAT2MFCC(atof_c(c));
+            c = cc + 1;
+            ++nvals;
+        }
+        if (nvals < acmod->fcb->cmn_struct->veclen && *c != '\0') {
+            acmod->fcb->cmn_struct->cmn_mean[nvals] = FLOAT2MFCC(atof_c(c));
+        }
+        ckd_free(vallist);
+    }
+    return 0;
+}
+
+int
+acmod_fe_mismatch(acmod_t *acmod, fe_t *fe)
+{
+    /* Output vector dimension needs to be the same. */
+    if (cmd_ln_int32_r(acmod->config, "-ceplen") != fe_get_output_size(fe)) {
+        E_ERROR("Configured feature length %d doesn't match feature "
+                "extraction output size %d\n",
+                cmd_ln_int32_r(acmod->config, "-ceplen"),
+                fe_get_output_size(fe));
+        return TRUE;
+    }
+    /* Feature parameters need to be the same. */
+    /* ... */
+    return FALSE;
+}
+
+int
+acmod_feat_mismatch(acmod_t *acmod, feat_t *fcb)
+{
+    /* Feature type needs to be the same. */
+    if (0 != strcmp(cmd_ln_str_r(acmod->config, "-feat"), feat_name(fcb)))
+        return TRUE;
+    /* Input vector dimension needs to be the same. */
+    if (cmd_ln_int32_r(acmod->config, "-ceplen") != feat_cepsize(fcb))
+        return TRUE;
+    /* FIXME: Need to check LDA and stuff too. */
+    return FALSE;
+}
+
+acmod_t *
+acmod_init(cmd_ln_t *config, logmath_t *lmath, fe_t *fe, feat_t *fcb)
+{
+    acmod_t *acmod;
+    char const *featparams;
+
+    acmod = ckd_calloc(1, sizeof(*acmod));
+    acmod->config = cmd_ln_retain(config);
+    acmod->lmath = lmath;
+    acmod->state = ACMOD_IDLE;
+
+    /* Look for feat.params in acoustic model dir. */
+    if ((featparams = cmd_ln_str_r(acmod->config, "-featparams"))) {
+        if (NULL !=
+            cmd_ln_parse_file_r(acmod->config, feat_defn, featparams, FALSE))
+            E_INFO("Parsed model-specific feature parameters from %s\n",
+                    featparams);
+    }
+
+    /* Initialize feature computation. */
+    if (fe) {
+        if (acmod_fe_mismatch(acmod, fe))
+            goto error_out;
+        fe_retain(fe);
+        acmod->fe = fe;
+    }
+    else {
+        /* Initialize a new front end. */
+        acmod->fe = fe_init_auto_r(config);
+        if (acmod->fe == NULL)
+            goto error_out;
+        if (acmod_fe_mismatch(acmod, acmod->fe))
+            goto error_out;
+    }
+    if (fcb) {
+        if (acmod_feat_mismatch(acmod, fcb))
+            goto error_out;
+        feat_retain(fcb);
+        acmod->fcb = fcb;
+    }
+    else {
+        /* Initialize a new fcb. */
+        if (acmod_init_feat(acmod) < 0)
+            goto error_out;
+    }
+
+    /* Load acoustic model parameters. */
+    if (acmod_init_am(acmod) < 0)
+        goto error_out;
+
+
+    /* The MFCC buffer needs to be at least as large as the dynamic
+     * feature window.  */
+    acmod->n_mfc_alloc = acmod->fcb->window_size * 2 + 1;
+    acmod->mfc_buf = (mfcc_t **)
+        ckd_calloc_2d(acmod->n_mfc_alloc, acmod->fcb->cepsize,
+                      sizeof(**acmod->mfc_buf));
+
+    /* Feature buffer has to be at least as large as MFCC buffer. */
+    acmod->n_feat_alloc = acmod->n_mfc_alloc + cmd_ln_int32_r(config, "-pl_window");
+    acmod->feat_buf = feat_array_alloc(acmod->fcb, acmod->n_feat_alloc);
+    acmod->framepos = ckd_calloc(acmod->n_feat_alloc, sizeof(*acmod->framepos));
+
+    acmod->utt_start_frame = 0;
+
+    /* Senone computation stuff. */
+    acmod->senone_scores = ckd_calloc(bin_mdef_n_sen(acmod->mdef),
+                                                     sizeof(*acmod->senone_scores));
+    acmod->senone_active_vec = bitvec_alloc(bin_mdef_n_sen(acmod->mdef));
+    acmod->senone_active = ckd_calloc(bin_mdef_n_sen(acmod->mdef),
+                                                     sizeof(*acmod->senone_active));
+    acmod->log_zero = logmath_get_zero(acmod->lmath);
+    acmod->compallsen = cmd_ln_boolean_r(config, "-compallsen");
+    return acmod;
+
+error_out:
+    acmod_free(acmod);
+    return NULL;
+}
+
+void
+acmod_free(acmod_t *acmod)
+{
+    if (acmod == NULL)
+        return;
+
+    feat_free(acmod->fcb);
+    fe_free(acmod->fe);
+    cmd_ln_free_r(acmod->config);
+
+    if (acmod->mfc_buf)
+        ckd_free_2d((void **)acmod->mfc_buf);
+    if (acmod->feat_buf)
+        feat_array_free(acmod->feat_buf);
+
+    if (acmod->mfcfh)
+        fclose(acmod->mfcfh);
+    if (acmod->rawfh)
+        fclose(acmod->rawfh);
+    if (acmod->senfh)
+        fclose(acmod->senfh);
+
+    ckd_free(acmod->framepos);
+    ckd_free(acmod->senone_scores);
+    ckd_free(acmod->senone_active_vec);
+    ckd_free(acmod->senone_active);
+    ckd_free(acmod->rawdata);
+
+    if (acmod->mdef)
+        bin_mdef_free(acmod->mdef);
+    if (acmod->tmat)
+        tmat_free(acmod->tmat);
+    if (acmod->mgau)
+        ps_mgau_free(acmod->mgau);
+    if (acmod->mllr)
+        ps_mllr_free(acmod->mllr);
+
+    ckd_free(acmod);
+}
+
+ps_mllr_t *
+acmod_update_mllr(acmod_t *acmod, ps_mllr_t *mllr)
+{
+    if (acmod->mllr)
+        ps_mllr_free(acmod->mllr);
+    acmod->mllr = mllr;
+    ps_mgau_transform(acmod->mgau, mllr);
+
+    return mllr;
+}
+
+int
+acmod_write_senfh_header(acmod_t *acmod, FILE *logfh)
+{
+    char nsenstr[64], logbasestr[64];
+
+    sprintf(nsenstr, "%d", bin_mdef_n_sen(acmod->mdef));
+    sprintf(logbasestr, "%f", logmath_get_base(acmod->lmath));
+    return bio_writehdr(logfh,
+                        "version", "0.1",
+                        "mdef_file", cmd_ln_str_r(acmod->config, "-mdef"),
+                        "n_sen", nsenstr,
+                        "logbase", logbasestr, NULL);
+}
+
+int
+acmod_set_senfh(acmod_t *acmod, FILE *logfh)
+{
+    if (acmod->senfh)
+        fclose(acmod->senfh);
+    acmod->senfh = logfh;
+    if (logfh == NULL)
+        return 0;
+    return acmod_write_senfh_header(acmod, logfh);
+}
+
+int
+acmod_set_mfcfh(acmod_t *acmod, FILE *logfh)
+{
+    int rv = 0;
+
+    if (acmod->mfcfh)
+        fclose(acmod->mfcfh);
+    acmod->mfcfh = logfh;
+    fwrite(&rv, 4, 1, acmod->mfcfh);
+    return rv;
+}
+
+int
+acmod_set_rawfh(acmod_t *acmod, FILE *logfh)
+{
+    if (acmod->rawfh)
+        fclose(acmod->rawfh);
+    acmod->rawfh = logfh;
+    return 0;
+}
+
+void
+acmod_grow_feat_buf(acmod_t *acmod, int nfr)
+{
+    if (nfr > MAX_N_FRAMES)
+        E_FATAL("Decoder can not process more than %d frames at once, "
+                "requested %d\n", MAX_N_FRAMES, nfr);
+
+    acmod->feat_buf = feat_array_realloc(acmod->fcb, acmod->feat_buf,
+                                         acmod->n_feat_alloc, nfr);
+    acmod->framepos = ckd_realloc(acmod->framepos,
+                                  nfr * sizeof(*acmod->framepos));
+    acmod->n_feat_alloc = nfr;
+}
+
+int
+acmod_set_grow(acmod_t *acmod, int grow_feat)
+{
+    int tmp = acmod->grow_feat;
+    acmod->grow_feat = grow_feat;
+
+    /* Expand feat_buf to a reasonable size to start with. */
+    if (grow_feat && acmod->n_feat_alloc < 128)
+        acmod_grow_feat_buf(acmod, 128);
+
+    return tmp;
+}
+
+int
+acmod_start_utt(acmod_t *acmod)
+{
+    fe_start_utt(acmod->fe);
+    acmod->state = ACMOD_STARTED;
+    acmod->n_mfc_frame = 0;
+    acmod->n_feat_frame = 0;
+    acmod->mfc_outidx = 0;
+    acmod->feat_outidx = 0;
+    acmod->output_frame = 0;
+    acmod->senscr_frame = -1;
+    acmod->n_senone_active = 0;
+    acmod->mgau->frame_idx = 0;
+    acmod->rawdata_pos = 0;
+
+    return 0;
+}
+
+int
+acmod_end_utt(acmod_t *acmod)
+{
+    int32 nfr = 0;
+
+    acmod->state = ACMOD_ENDED;
+    if (acmod->n_mfc_frame < acmod->n_mfc_alloc) {
+        int inptr;
+        /* Where to start writing them (circular buffer) */
+        inptr = (acmod->mfc_outidx + acmod->n_mfc_frame) % acmod->n_mfc_alloc;
+        /* nfr is always either zero or one. */
+        fe_end_utt(acmod->fe, acmod->mfc_buf[inptr], &nfr);
+        acmod->n_mfc_frame += nfr;
+        
+        /* Process whatever's left, and any leadout or update stats if needed. */
+        if (nfr)
+            nfr = acmod_process_mfcbuf(acmod);
+        else
+            feat_update_stats(acmod->fcb);
+    }
+    if (acmod->mfcfh) {
+        long outlen;
+        int32 rv;
+        outlen = (ftell(acmod->mfcfh) - 4) / 4;
+        if (!WORDS_BIGENDIAN)
+            SWAP_INT32(&outlen);
+        /* Try to seek and write */
+        if ((rv = fseek(acmod->mfcfh, 0, SEEK_SET)) == 0) {
+            fwrite(&outlen, 4, 1, acmod->mfcfh);
+        }
+        fclose(acmod->mfcfh);
+        acmod->mfcfh = NULL;
+    }
+    if (acmod->rawfh) {
+        fclose(acmod->rawfh);
+        acmod->rawfh = NULL;
+    }
+
+    if (acmod->senfh) {
+        fclose(acmod->senfh);
+        acmod->senfh = NULL;
+    }
+
+    return nfr;
+}
+
+static int
+acmod_log_mfc(acmod_t *acmod,
+              mfcc_t **cep, int n_frames)
+{
+    int i, n;
+    int32 *ptr = (int32 *)cep[0];
+
+    n = n_frames * feat_cepsize(acmod->fcb);
+    /* Swap bytes. */
+    if (!WORDS_BIGENDIAN) {
+        for (i = 0; i < (n * sizeof(mfcc_t)); ++i) {
+            SWAP_INT32(ptr + i);
+        }
+    }
+    /* Write features. */
+    if (fwrite(cep[0], sizeof(mfcc_t), n, acmod->mfcfh) != n) {
+        E_ERROR_SYSTEM("Failed to write %d values to log file", n);
+    }
+
+    /* Swap them back. */
+    if (!WORDS_BIGENDIAN) {
+        for (i = 0; i < (n * sizeof(mfcc_t)); ++i) {
+            SWAP_INT32(ptr + i);
+        }
+    }
+    return 0;
+}
+
+static int
+acmod_process_full_cep(acmod_t *acmod,
+                       mfcc_t ***inout_cep,
+                       int *inout_n_frames)
+{
+    int32 nfr;
+
+    /* Write to log file. */
+    if (acmod->mfcfh)
+        acmod_log_mfc(acmod, *inout_cep, *inout_n_frames);
+
+    /* Resize feat_buf to fit. */
+    if (acmod->n_feat_alloc < *inout_n_frames) {
+
+        if (*inout_n_frames > MAX_N_FRAMES)
+            E_FATAL("Batch processing can not process more than %d frames "
+                    "at once, requested %d\n", MAX_N_FRAMES, *inout_n_frames);
+
+        feat_array_free(acmod->feat_buf);
+        acmod->feat_buf = feat_array_alloc(acmod->fcb, *inout_n_frames);
+        acmod->n_feat_alloc = *inout_n_frames;
+        acmod->n_feat_frame = 0;
+        acmod->feat_outidx = 0;
+    }
+    /* Make dynamic features. */
+    nfr = feat_s2mfc2feat_live(acmod->fcb, *inout_cep, inout_n_frames,
+                               TRUE, TRUE, acmod->feat_buf);
+    acmod->n_feat_frame = nfr;
+    assert(acmod->n_feat_frame <= acmod->n_feat_alloc);
+    *inout_cep += *inout_n_frames;
+    *inout_n_frames = 0;
+
+    return nfr;
+}
+
+static int
+acmod_process_full_raw(acmod_t *acmod,
+                       int16 const **inout_raw,
+                       size_t *inout_n_samps)
+{
+    int32 nfr, ntail;
+    mfcc_t **cepptr;
+
+    /* Write to logging file if any. */
+    if (*inout_n_samps + acmod->rawdata_pos < acmod->rawdata_size) {
+	memcpy(acmod->rawdata + acmod->rawdata_pos, *inout_raw, *inout_n_samps * sizeof(int16));
+	acmod->rawdata_pos += *inout_n_samps;
+    }
+    if (acmod->rawfh)
+        fwrite(*inout_raw, sizeof(int16), *inout_n_samps, acmod->rawfh);
+    /* Resize mfc_buf to fit. */
+    if (fe_process_frames(acmod->fe, NULL, inout_n_samps, NULL, &nfr, NULL) < 0)
+        return -1;
+    if (acmod->n_mfc_alloc < nfr + 1) {
+        ckd_free_2d(acmod->mfc_buf);
+        acmod->mfc_buf = ckd_calloc_2d(nfr + 1, fe_get_output_size(acmod->fe),
+                                       sizeof(**acmod->mfc_buf));
+        acmod->n_mfc_alloc = nfr + 1;
+    }
+    acmod->n_mfc_frame = 0;
+    acmod->mfc_outidx = 0;
+    fe_start_utt(acmod->fe);
+    if (fe_process_frames(acmod->fe, inout_raw, inout_n_samps,
+                          acmod->mfc_buf, &nfr, NULL) < 0)
+        return -1;
+    fe_end_utt(acmod->fe, acmod->mfc_buf[nfr], &ntail);
+    nfr += ntail;
+
+    cepptr = acmod->mfc_buf;
+    nfr = acmod_process_full_cep(acmod, &cepptr, &nfr);
+    acmod->n_mfc_frame = 0;
+    return nfr;
+}
+
+/**
+ * Process MFCCs that are in the internal buffer into features.
+ */
+static int32
+acmod_process_mfcbuf(acmod_t *acmod)
+{
+    mfcc_t **mfcptr;
+    int32 ncep;
+
+    ncep = acmod->n_mfc_frame;
+    /* Also do this in two parts because of the circular mfc_buf. */
+    if (acmod->mfc_outidx + ncep > acmod->n_mfc_alloc) {
+        int32 ncep1 = acmod->n_mfc_alloc - acmod->mfc_outidx;
+        int saved_state = acmod->state;
+
+        /* Make sure we don't end the utterance here. */
+        if (acmod->state == ACMOD_ENDED)
+            acmod->state = ACMOD_PROCESSING;
+        mfcptr = acmod->mfc_buf + acmod->mfc_outidx;
+        ncep1 = acmod_process_cep(acmod, &mfcptr, &ncep1, FALSE);
+        /* It's possible that not all available frames were filled. */
+        ncep -= ncep1;
+        acmod->n_mfc_frame -= ncep1;
+        acmod->mfc_outidx += ncep1;
+        acmod->mfc_outidx %= acmod->n_mfc_alloc;
+        /* Restore original state (could this really be the end) */
+        acmod->state = saved_state;
+    }
+    mfcptr = acmod->mfc_buf + acmod->mfc_outidx;
+    ncep = acmod_process_cep(acmod, &mfcptr, &ncep, FALSE);
+    acmod->n_mfc_frame -= ncep;
+    acmod->mfc_outidx += ncep;
+    acmod->mfc_outidx %= acmod->n_mfc_alloc;
+    return ncep;
+}
+
+int
+acmod_process_raw(acmod_t *acmod,
+                  int16 const **inout_raw,
+                  size_t *inout_n_samps,
+                  int full_utt)
+{
+    int32 ncep;
+    int32 out_frameidx;
+    int16 const *prev_audio_inptr;
+    
+    /* If this is a full utterance, process it all at once. */
+    if (full_utt)
+        return acmod_process_full_raw(acmod, inout_raw, inout_n_samps);
+
+    /* Append MFCCs to the end of any that are previously in there
+     * (in practice, there will probably be none) */
+    if (inout_n_samps && *inout_n_samps) {
+        int inptr;
+        int32 processed_samples;
+
+        prev_audio_inptr = *inout_raw;
+        /* Total number of frames available. */
+        ncep = acmod->n_mfc_alloc - acmod->n_mfc_frame;
+        /* Where to start writing them (circular buffer) */
+        inptr = (acmod->mfc_outidx + acmod->n_mfc_frame) % acmod->n_mfc_alloc;
+
+        /* Write them in two (or more) parts if there is wraparound. */
+        while (inptr + ncep > acmod->n_mfc_alloc) {
+            int32 ncep1 = acmod->n_mfc_alloc - inptr;
+            if (fe_process_frames(acmod->fe, inout_raw, inout_n_samps,
+                                  acmod->mfc_buf + inptr, &ncep1, &out_frameidx) < 0)
+                return -1;
+	    
+	    if (out_frameidx > 0)
+		acmod->utt_start_frame = out_frameidx;
+
+    	    processed_samples = *inout_raw - prev_audio_inptr;
+	    if (processed_samples + acmod->rawdata_pos < acmod->rawdata_size) {
+		memcpy(acmod->rawdata + acmod->rawdata_pos, prev_audio_inptr, processed_samples * sizeof(int16));
+		acmod->rawdata_pos += processed_samples;
+	    }
+            /* Write to logging file if any. */
+            if (acmod->rawfh) {
+                fwrite(prev_audio_inptr, sizeof(int16),
+                       processed_samples,
+                       acmod->rawfh);
+            }
+            prev_audio_inptr = *inout_raw;
+            
+            /* ncep1 now contains the number of frames actually
+             * processed.  This is a good thing, but it means we
+             * actually still might have some room left at the end of
+             * the buffer, hence the while loop.  Unfortunately it
+             * also means that in the case where we are really
+             * actually done, we need to get out totally, hence the
+             * goto. */
+            acmod->n_mfc_frame += ncep1;
+            ncep -= ncep1;
+            inptr += ncep1;
+            inptr %= acmod->n_mfc_alloc;
+            if (ncep1 == 0)
+        	goto alldone;
+        }
+
+        assert(inptr + ncep <= acmod->n_mfc_alloc);        
+        if (fe_process_frames(acmod->fe, inout_raw, inout_n_samps,
+                              acmod->mfc_buf + inptr, &ncep, &out_frameidx) < 0)
+            return -1;
+
+	if (out_frameidx > 0)
+	    acmod->utt_start_frame = out_frameidx;
+
+	
+	processed_samples = *inout_raw - prev_audio_inptr;
+	if (processed_samples + acmod->rawdata_pos < acmod->rawdata_size) {
+	    memcpy(acmod->rawdata + acmod->rawdata_pos, prev_audio_inptr, processed_samples * sizeof(int16));
+	    acmod->rawdata_pos += processed_samples;
+	}
+        if (acmod->rawfh) {
+            fwrite(prev_audio_inptr, sizeof(int16),
+                   processed_samples, acmod->rawfh);
+        }
+        prev_audio_inptr = *inout_raw;
+        acmod->n_mfc_frame += ncep;
+    alldone:
+        ;
+    }
+
+    /* Hand things off to acmod_process_cep. */
+    return acmod_process_mfcbuf(acmod);
+}
+
+int
+acmod_process_cep(acmod_t *acmod,
+                  mfcc_t ***inout_cep,
+                  int *inout_n_frames,
+                  int full_utt)
+{
+    int32 nfeat, ncep, inptr;
+    int orig_n_frames;
+
+    /* If this is a full utterance, process it all at once. */
+    if (full_utt)
+        return acmod_process_full_cep(acmod, inout_cep, inout_n_frames);
+
+    /* Write to log file. */
+    if (acmod->mfcfh)
+        acmod_log_mfc(acmod, *inout_cep, *inout_n_frames);
+
+    /* Maximum number of frames we're going to generate. */
+    orig_n_frames = ncep = nfeat = *inout_n_frames;
+
+    /* FIXME: This behaviour isn't guaranteed... */
+    if (acmod->state == ACMOD_ENDED)
+        nfeat += feat_window_size(acmod->fcb);
+    else if (acmod->state == ACMOD_STARTED)
+        nfeat -= feat_window_size(acmod->fcb);
+
+    /* Clamp number of features to fit available space. */
+    if (nfeat > acmod->n_feat_alloc - acmod->n_feat_frame) {
+        /* Grow it as needed - we have to grow it at the end of an
+         * utterance because we can't return a short read there. */
+        if (acmod->grow_feat || acmod->state == ACMOD_ENDED)
+            acmod_grow_feat_buf(acmod, acmod->n_feat_alloc + nfeat);
+        else
+            ncep -= (nfeat - (acmod->n_feat_alloc - acmod->n_feat_frame));
+    }
+
+    /* Where to start writing in the feature buffer. */
+    if (acmod->grow_feat) {
+        /* Grow to avoid wraparound if grow_feat == TRUE. */
+        inptr = acmod->feat_outidx + acmod->n_feat_frame;
+        while (inptr + nfeat >= acmod->n_feat_alloc)
+            acmod_grow_feat_buf(acmod, acmod->n_feat_alloc * 2);
+    }
+    else {
+        inptr = (acmod->feat_outidx + acmod->n_feat_frame) % acmod->n_feat_alloc;
+    }
+
+
+    /* FIXME: we can't split the last frame drop properly to be on the bounary,
+     *        so just return
+     */
+    if (inptr + nfeat > acmod->n_feat_alloc && acmod->state == ACMOD_ENDED) {
+        *inout_n_frames -= ncep;
+        *inout_cep += ncep;
+        return 0;
+    }
+
+    /* Write them in two parts if there is wraparound. */
+    if (inptr + nfeat > acmod->n_feat_alloc) {
+        int32 ncep1 = acmod->n_feat_alloc - inptr;
+
+        /* Make sure we don't end the utterance here. */
+        nfeat = feat_s2mfc2feat_live(acmod->fcb, *inout_cep,
+                                     &ncep1,
+                                     (acmod->state == ACMOD_STARTED),
+                                     FALSE,
+                                     acmod->feat_buf + inptr);
+        if (nfeat < 0)
+            return -1;
+        /* Move the output feature pointer forward. */
+        acmod->n_feat_frame += nfeat;
+        assert(acmod->n_feat_frame <= acmod->n_feat_alloc);
+        inptr += nfeat;
+        inptr %= acmod->n_feat_alloc;
+        /* Move the input feature pointers forward. */
+        *inout_n_frames -= ncep1;
+        *inout_cep += ncep1;
+        ncep -= ncep1;
+    }
+
+    nfeat = feat_s2mfc2feat_live(acmod->fcb, *inout_cep,
+                                 &ncep,
+                                 (acmod->state == ACMOD_STARTED),
+                                 (acmod->state == ACMOD_ENDED),
+                                 acmod->feat_buf + inptr);
+    if (nfeat < 0)
+        return -1;
+    acmod->n_feat_frame += nfeat;
+    assert(acmod->n_feat_frame <= acmod->n_feat_alloc);
+    /* Move the input feature pointers forward. */
+    *inout_n_frames -= ncep;
+    *inout_cep += ncep;
+    if (acmod->state == ACMOD_STARTED)
+        acmod->state = ACMOD_PROCESSING;
+    
+    return orig_n_frames - *inout_n_frames;
+}
+
+int
+acmod_process_feat(acmod_t *acmod,
+                   mfcc_t **feat)
+{
+    int i, inptr;
+
+    if (acmod->n_feat_frame == acmod->n_feat_alloc) {
+        if (acmod->grow_feat)
+            acmod_grow_feat_buf(acmod, acmod->n_feat_alloc * 2);
+        else
+            return 0;
+    }
+
+    if (acmod->grow_feat) {
+        /* Grow to avoid wraparound if grow_feat == TRUE. */
+        inptr = acmod->feat_outidx + acmod->n_feat_frame;
+        while (inptr + 1 >= acmod->n_feat_alloc)
+            acmod_grow_feat_buf(acmod, acmod->n_feat_alloc * 2);
+    }
+    else {
+        inptr = (acmod->feat_outidx + acmod->n_feat_frame) % acmod->n_feat_alloc;
+    }
+    for (i = 0; i < feat_dimension1(acmod->fcb); ++i)
+        memcpy(acmod->feat_buf[inptr][i],
+               feat[i], feat_dimension2(acmod->fcb, i) * sizeof(**feat));
+    ++acmod->n_feat_frame;
+    assert(acmod->n_feat_frame <= acmod->n_feat_alloc);
+
+    return 1;
+}
+
+static int
+acmod_read_senfh_header(acmod_t *acmod)
+{
+    char **name, **val;
+    int32 swap;
+    int i;
+
+    if (bio_readhdr(acmod->insenfh, &name, &val, &swap) < 0)
+        goto error_out;
+    for (i = 0; name[i] != NULL; ++i) {
+        if (!strcmp(name[i], "n_sen")) {
+            if (atoi(val[i]) != bin_mdef_n_sen(acmod->mdef)) {
+                E_ERROR("Number of senones in senone file (%d) does not "
+                        "match mdef (%d)\n", atoi(val[i]),
+                        bin_mdef_n_sen(acmod->mdef));
+                goto error_out;
+            }
+        }
+
+        if (!strcmp(name[i], "logbase")) {
+            if (fabs(atof_c(val[i]) - logmath_get_base(acmod->lmath)) > 0.001) {
+                E_ERROR("Logbase in senone file (%f) does not match acmod "
+                        "(%f)\n", atof_c(val[i]),
+                        logmath_get_base(acmod->lmath));
+                goto error_out;
+            }
+        }
+    }
+    acmod->insen_swap = swap;
+    bio_hdrarg_free(name, val);
+    return 0;
+error_out:
+    bio_hdrarg_free(name, val);
+    return -1;
+}
+
+int
+acmod_set_insenfh(acmod_t *acmod, FILE *senfh)
+{
+    acmod->insenfh = senfh;
+    if (senfh == NULL) {
+        acmod->n_feat_frame = 0;
+        acmod->compallsen = cmd_ln_boolean_r(acmod->config, "-compallsen");
+        return 0;
+    }
+    acmod->compallsen = TRUE;
+    return acmod_read_senfh_header(acmod);
+}
+
+int
+acmod_rewind(acmod_t *acmod)
+{
+    /* If the feature buffer is circular, this is not possible. */
+    if (acmod->output_frame > acmod->n_feat_alloc) {
+        E_ERROR("Circular feature buffer cannot be rewound (output frame %d, "
+                "alloc %d)\n", acmod->output_frame, acmod->n_feat_alloc);
+        return -1;
+    }
+
+    /* Frames consumed + frames available */
+    acmod->n_feat_frame = acmod->output_frame + acmod->n_feat_frame;
+
+    /* Reset output pointers. */
+    acmod->feat_outidx = 0;
+    acmod->output_frame = 0;
+    acmod->senscr_frame = -1;
+    acmod->mgau->frame_idx = 0;
+
+    return 0;
+}
+
+int
+acmod_advance(acmod_t *acmod)
+{
+    /* Advance the output pointers. */
+    if (++acmod->feat_outidx == acmod->n_feat_alloc)
+        acmod->feat_outidx = 0;
+    --acmod->n_feat_frame;
+    ++acmod->mgau->frame_idx;
+
+    return ++acmod->output_frame;
+}
+
+int
+acmod_write_scores(acmod_t *acmod, int n_active, uint8 const *active,
+                   int16 const *senscr, FILE *senfh)
+{
+    int16 n_active2;
+
+    /* Uncompressed frame format:
+     *
+     * (2 bytes) n_active: Number of active senones
+     * If all senones active:
+     * (n_active * 2 bytes) scores of active senones
+     *
+     * Otherwise:
+     * (2 bytes) n_active: Number of active senones
+     * (n_active bytes) deltas to active senones
+     * (n_active * 2 bytes) scores of active senones
+     */
+    n_active2 = n_active;
+    if (fwrite(&n_active2, 2, 1, senfh) != 1)
+        goto error_out;
+    if (n_active == bin_mdef_n_sen(acmod->mdef)) {
+        if (fwrite(senscr, 2, n_active, senfh) != n_active)
+            goto error_out;
+    }
+    else {
+        int i, n;
+        if (fwrite(active, 1, n_active, senfh) != n_active)
+            goto error_out;
+        for (i = n = 0; i < n_active; ++i) {
+            n += active[i];
+            if (fwrite(senscr + n, 2, 1, senfh) != 1)
+                goto error_out;
+        }
+    }
+    return 0;
+error_out:
+    E_ERROR_SYSTEM("Failed to write frame to senone file");
+    return -1;
+}
+
+/**
+ * Internal version, used for reading previous frames in acmod_score()
+ */
+static int
+acmod_read_scores_internal(acmod_t *acmod)
+{
+    FILE *senfh = acmod->insenfh;
+    int16 n_active;
+    size_t rv;
+
+    if (acmod->n_feat_frame == acmod->n_feat_alloc) {
+        if (acmod->grow_feat)
+            acmod_grow_feat_buf(acmod, acmod->n_feat_alloc * 2);
+        else
+            return 0;
+    }
+
+    if (senfh == NULL)
+        return -1;
+    
+    if ((rv = fread(&n_active, 2, 1, senfh)) != 1)
+        goto error_out;
+
+    acmod->n_senone_active = n_active;
+    if (acmod->n_senone_active == bin_mdef_n_sen(acmod->mdef)) {
+        if ((rv = fread(acmod->senone_scores, 2,
+                        acmod->n_senone_active, senfh)) != acmod->n_senone_active)
+            goto error_out;
+    }
+    else {
+        int i, n;
+        
+        if ((rv = fread(acmod->senone_active, 1,
+                        acmod->n_senone_active, senfh)) != acmod->n_senone_active)
+            goto error_out;
+
+        for (i = 0, n = 0; i < acmod->n_senone_active; ++i) {
+            int j, sen = n + acmod->senone_active[i];
+            for (j = n + 1; j < sen; ++j)
+                acmod->senone_scores[j] = SENSCR_DUMMY;
+            
+            if ((rv = fread(acmod->senone_scores + sen, 2, 1, senfh)) != 1)
+                goto error_out;
+            
+            n = sen;
+        }
+
+        n++;
+        while (n < bin_mdef_n_sen(acmod->mdef))
+            acmod->senone_scores[n++] = SENSCR_DUMMY;
+    }
+    return 1;
+
+error_out:
+    if (ferror(senfh)) {
+        E_ERROR_SYSTEM("Failed to read frame from senone file");
+        return -1;
+    }
+    return 0;
+}
+
+int
+acmod_read_scores(acmod_t *acmod)
+{
+    int inptr, rv;
+
+    if (acmod->grow_feat) {
+        /* Grow to avoid wraparound if grow_feat == TRUE. */
+        inptr = acmod->feat_outidx + acmod->n_feat_frame;
+        /* Has to be +1, otherwise, next time acmod_advance() is
+         * called, this will wrap around. */
+        while (inptr + 1 >= acmod->n_feat_alloc)
+            acmod_grow_feat_buf(acmod, acmod->n_feat_alloc * 2);
+    }
+    else {
+        inptr = (acmod->feat_outidx + acmod->n_feat_frame) %
+                acmod->n_feat_alloc;
+    }
+
+    if ((rv = acmod_read_scores_internal(acmod)) != 1)
+        return rv;
+
+    /* Set acmod->senscr_frame appropriately so that these scores
+       get reused below in acmod_score(). */
+    acmod->senscr_frame = acmod->output_frame + acmod->n_feat_frame;
+
+    E_DEBUG(1,("Frame %d has %d active states\n",
+               acmod->senscr_frame, acmod->n_senone_active));
+
+    /* Increment the "feature frame counter" and record the file
+     * position for the relevant frame in the (possibly circular)
+     * buffer. */
+    ++acmod->n_feat_frame;
+    acmod->framepos[inptr] = ftell(acmod->insenfh);
+
+    return 1;
+}
+
+static int
+calc_frame_idx(acmod_t *acmod, int *inout_frame_idx)
+{
+    int frame_idx;
+
+    /* Calculate the absolute frame index to be scored. */
+    if (inout_frame_idx == NULL)
+        frame_idx = acmod->output_frame;
+    else if (*inout_frame_idx < 0)
+        frame_idx = acmod->output_frame + 1 + *inout_frame_idx;
+    else
+        frame_idx = *inout_frame_idx;
+
+    return frame_idx;
+}
+
+static int
+calc_feat_idx(acmod_t *acmod, int frame_idx)
+{
+    int n_backfr, feat_idx;
+
+    n_backfr = acmod->n_feat_alloc - acmod->n_feat_frame;
+    if (frame_idx < 0 || acmod->output_frame - frame_idx > n_backfr) {
+        E_ERROR("Frame %d outside queue of %d frames, %d alloc (%d > %d), "
+                "cannot score\n", frame_idx, acmod->n_feat_frame,
+                acmod->n_feat_alloc, acmod->output_frame - frame_idx,
+                n_backfr);
+        return -1;
+    }
+
+    /* Get the index in feat_buf/framepos of the frame to be scored. */
+    feat_idx = (acmod->feat_outidx + frame_idx - acmod->output_frame) %
+               acmod->n_feat_alloc;
+    if (feat_idx < 0)
+        feat_idx += acmod->n_feat_alloc;
+
+    return feat_idx;
+}
+
+mfcc_t **
+acmod_get_frame(acmod_t *acmod, int *inout_frame_idx)
+{
+    int frame_idx, feat_idx;
+
+    /* Calculate the absolute frame index requested. */
+    frame_idx = calc_frame_idx(acmod, inout_frame_idx);
+
+    /* Calculate position of requested frame in circular buffer. */
+    if ((feat_idx = calc_feat_idx(acmod, frame_idx)) < 0)
+        return NULL;
+
+    if (inout_frame_idx)
+        *inout_frame_idx = frame_idx;
+
+    return acmod->feat_buf[feat_idx];
+}
+
+int16 const *
+acmod_score(acmod_t *acmod, int *inout_frame_idx)
+{
+    int frame_idx, feat_idx;
+
+    /* Calculate the absolute frame index to be scored. */
+    frame_idx = calc_frame_idx(acmod, inout_frame_idx);
+
+    /* If all senones are being computed, or we are using a senone file,
+       then we can reuse existing scores. */
+    if ((acmod->compallsen || acmod->insenfh)
+        && frame_idx == acmod->senscr_frame) {
+        if (inout_frame_idx)
+            *inout_frame_idx = frame_idx;
+        return acmod->senone_scores;
+    }
+
+    /* Calculate position of requested frame in circular buffer. */
+    if ((feat_idx = calc_feat_idx(acmod, frame_idx)) < 0)
+        return NULL;
+
+    /*
+     * If there is an input senone file locate the appropriate frame and read
+     * it.
+     */
+    if (acmod->insenfh) {
+        fseek(acmod->insenfh, acmod->framepos[feat_idx], SEEK_SET);
+        if (acmod_read_scores_internal(acmod) < 0)
+            return NULL;
+    }
+    else {
+        /* Build active senone list. */
+        acmod_flags2list(acmod);
+
+        /* Generate scores for the next available frame */
+        ps_mgau_frame_eval(acmod->mgau,
+                           acmod->senone_scores,
+                           acmod->senone_active,
+                           acmod->n_senone_active,
+                           acmod->feat_buf[feat_idx],
+                           frame_idx,
+                           acmod->compallsen);
+    }
+
+    if (inout_frame_idx)
+        *inout_frame_idx = frame_idx;
+    acmod->senscr_frame = frame_idx;
+
+    /* Dump scores to the senone dump file if one exists. */
+    if (acmod->senfh) {
+        if (acmod_write_scores(acmod, acmod->n_senone_active,
+                               acmod->senone_active,
+                               acmod->senone_scores,
+                               acmod->senfh) < 0)
+            return NULL;
+        E_DEBUG(1,("Frame %d has %d active states\n", frame_idx,
+                   acmod->n_senone_active));
+    }
+
+    return acmod->senone_scores;
+}
+
+int
+acmod_best_score(acmod_t *acmod, int *out_best_senid)
+{
+    int i, best;
+
+    best = SENSCR_DUMMY;
+    if (acmod->compallsen) {
+        for (i = 0; i < bin_mdef_n_sen(acmod->mdef); ++i) {
+            if (acmod->senone_scores[i] < best) {
+                best = acmod->senone_scores[i];
+                *out_best_senid = i;
+            }
+        }
+    }
+    else {
+        int16 *senscr;
+        senscr = acmod->senone_scores;
+        for (i = 0; i < acmod->n_senone_active; ++i) {
+            senscr += acmod->senone_active[i];
+            if (*senscr < best) {
+                best = *senscr;
+                *out_best_senid = i;
+            }
+        }
+    }
+    return best;
+}
+
+
+void
+acmod_clear_active(acmod_t *acmod)
+{
+    if (acmod->compallsen)
+        return;
+    bitvec_clear_all(acmod->senone_active_vec, bin_mdef_n_sen(acmod->mdef));
+    acmod->n_senone_active = 0;
+}
+
+#define MPX_BITVEC_SET(a,h,i)                                   \
+    if (hmm_mpx_ssid(h,i) != BAD_SSID)                          \
+        bitvec_set((a)->senone_active_vec, hmm_mpx_senid(h,i))
+#define NONMPX_BITVEC_SET(a,h,i)                                        \
+    bitvec_set((a)->senone_active_vec,                                  \
+               hmm_nonmpx_senid(h,i))
+
+void
+acmod_activate_hmm(acmod_t *acmod, hmm_t *hmm)
+{
+    int i;
+
+    if (acmod->compallsen)
+        return;
+    if (hmm_is_mpx(hmm)) {
+        switch (hmm_n_emit_state(hmm)) {
+        case 5:
+            MPX_BITVEC_SET(acmod, hmm, 4);
+            MPX_BITVEC_SET(acmod, hmm, 3);
+        case 3:
+            MPX_BITVEC_SET(acmod, hmm, 2);
+            MPX_BITVEC_SET(acmod, hmm, 1);
+            MPX_BITVEC_SET(acmod, hmm, 0);
+            break;
+        default:
+            for (i = 0; i < hmm_n_emit_state(hmm); ++i) {
+                MPX_BITVEC_SET(acmod, hmm, i);
+            }
+        }
+    }
+    else {
+        switch (hmm_n_emit_state(hmm)) {
+        case 5:
+            NONMPX_BITVEC_SET(acmod, hmm, 4);
+            NONMPX_BITVEC_SET(acmod, hmm, 3);
+        case 3:
+            NONMPX_BITVEC_SET(acmod, hmm, 2);
+            NONMPX_BITVEC_SET(acmod, hmm, 1);
+            NONMPX_BITVEC_SET(acmod, hmm, 0);
+            break;
+        default:
+            for (i = 0; i < hmm_n_emit_state(hmm); ++i) {
+                NONMPX_BITVEC_SET(acmod, hmm, i);
+            }
+        }
+    }
+}
+
+int32
+acmod_flags2list(acmod_t *acmod)
+{
+    int32 w, l, n, b, total_dists, total_words, extra_bits;
+    bitvec_t *flagptr;
+
+    total_dists = bin_mdef_n_sen(acmod->mdef);
+    if (acmod->compallsen) {
+        acmod->n_senone_active = total_dists;
+        return total_dists;
+    }
+    total_words = total_dists / BITVEC_BITS;
+    extra_bits = total_dists % BITVEC_BITS;
+    w = n = l = 0;
+    for (flagptr = acmod->senone_active_vec; w < total_words; ++w, ++flagptr) {
+        if (*flagptr == 0)
+            continue;
+        for (b = 0; b < BITVEC_BITS; ++b) {
+            if (*flagptr & (1UL << b)) {
+                int32 sen = w * BITVEC_BITS + b;
+                int32 delta = sen - l;
+                /* Handle excessive deltas "lossily" by adding a few
+                   extra senones to bridge the gap. */
+                while (delta > 255) {
+                    acmod->senone_active[n++] = 255;
+                    delta -= 255;
+                }
+                acmod->senone_active[n++] = delta;
+                l = sen;
+            }
+        }
+    }
+
+    for (b = 0; b < extra_bits; ++b) {
+        if (*flagptr & (1UL << b)) {
+            int32 sen = w * BITVEC_BITS + b;
+            int32 delta = sen - l;
+            /* Handle excessive deltas "lossily" by adding a few
+               extra senones to bridge the gap. */
+            while (delta > 255) {
+                acmod->senone_active[n++] = 255;
+                delta -= 255;
+            }
+            acmod->senone_active[n++] = delta;
+            l = sen;
+        }
+    }
+
+    acmod->n_senone_active = n;
+    E_DEBUG(1, ("acmod_flags2list: %d active in frame %d\n",
+                acmod->n_senone_active, acmod->output_frame));
+    return n;
+}
+
+int32
+acmod_stream_offset(acmod_t *acmod)
+{
+    return acmod->utt_start_frame;
+}
+
+void
+acmod_start_stream(acmod_t *acmod)
+{
+    fe_start_stream(acmod->fe);
+    acmod->utt_start_frame = 0;
+}
+
+void
+acmod_set_rawdata_size(acmod_t *acmod, int32 size)
+{	
+    assert(size >= 0);
+    acmod->rawdata_size = size;
+    if (acmod->rawdata_size > 0) {
+	ckd_free(acmod->rawdata);
+	acmod->rawdata = ckd_calloc(size, sizeof(int16));
+    }
+}
+
+void
+acmod_get_rawdata(acmod_t *acmod, int16 **buffer, int32 *size)
+{
+    if (buffer) {
+	*buffer = acmod->rawdata;
+    }
+    if (size) {
+	*size = acmod->rawdata_pos;
+    }
+}
+