static void
compute_fwdflat_sen_active(ngram_search_t *ngs, int frame_idx)
{
int32 i, w;
int32 *awl;
root_chan_t *rhmm;
chan_t *hmm;
acmod_clear_active(ps_search_acmod(ngs));
i = ngs->n_active_word[frame_idx & 0x1];
awl = ngs->active_word_list[frame_idx & 0x1];
for (w = *(awl++); i > 0; --i, w = *(awl++)) {
rhmm = (root_chan_t *)ngs->word_chan[w];
if (hmm_frame(&rhmm->hmm) == frame_idx) {
acmod_activate_hmm(ps_search_acmod(ngs), &rhmm->hmm);
}
for (hmm = rhmm->next; hmm; hmm = hmm->next) {
if (hmm_frame(&hmm->hmm) == frame_idx) {
acmod_activate_hmm(ps_search_acmod(ngs), &hmm->hmm);
}
}
}
}
static int
phone_loop_search_step(ps_search_t *search, int frame_idx)
{
phone_loop_search_t *pls = (phone_loop_search_t *)search;
acmod_t *acmod = ps_search_acmod(search);
int16 const *senscr;
int i;
/* All CI senones are active all the time. */
if (!ps_search_acmod(pls)->compallsen)
for (i = 0; i < pls->n_phones; ++i)
acmod_activate_hmm(acmod, (hmm_t *)&pls->phones[i]);
/* Calculate senone scores for current frame. */
senscr = acmod_score(acmod, &frame_idx);
/* Renormalize, if necessary. */
if (pls->best_score + (2 * pls->beam) WORSE_THAN WORST_SCORE) {
E_INFO("Renormalizing Scores at frame %d, best score %d\n",
frame_idx, pls->best_score);
renormalize_hmms(pls, frame_idx, pls->best_score);
}
/* Evaluate phone HMMs for current frame. */
pls->best_score = evaluate_hmms(pls, senscr, frame_idx);
/* Prune phone HMMs. */
prune_hmms(pls, frame_idx);
/* Do phone transitions. */
phone_transition(pls, frame_idx);
return 0;
}
static int
state_align_search_step(ps_search_t *search, int frame_idx)
{
state_align_search_t *sas = (state_align_search_t *)search;
acmod_t *acmod = ps_search_acmod(search);
int16 const *senscr;
int i;
/* Calculate senone scores. */
for (i = 0; i < sas->n_phones; ++i)
acmod_activate_hmm(acmod, sas->hmms + i);
senscr = acmod_score(acmod, &frame_idx);
/* Renormalize here if needed. */
/* FIXME: Make sure to (unit-)test this!!! */
if ((sas->best_score - 0x300000) WORSE_THAN WORST_SCORE) {
E_INFO("Renormalizing Scores at frame %d, best score %d\n",
frame_idx, sas->best_score);
renormalize_hmms(sas, frame_idx, sas->best_score);
}
/* Viterbi step. */
sas->best_score = evaluate_hmms(sas, senscr, frame_idx);
prune_hmms(sas, frame_idx);
/* Transition out of non-emitting states. */
phone_transition(sas, frame_idx);
/* Generate new tokens from best path results. */
record_transitions(sas, frame_idx);
/* Update frame counter */
sas->frame = frame_idx;
return 0;
}