Snippet from pocketsphinx/src/programs/continuous.c that handles continuous recognition from microphone (be it from Pulse, ALSA, or Jack).

recognize_from_mic.c

/*
 * Main utterance processing loop:
 *     for (;;) {
 *      wait for start of next utterance;
 * 	   decode utterance until silence of at least 1 sec observed;
 * 	   print utterance result;
 *     }
 */
static void
recognize_from_microphone()
{
    ad_rec_t *ad;
    int16 adbuf[4096];
    int32 k, ts, rem;
    char const *hyp;
    char const *uttid;
    cont_ad_t *cont;
    char word[256];

    if ((ad = ad_open_dev(cmd_ln_str_r(config, "-adcdev"),
                          (int)cmd_ln_float32_r(config, "-samprate"))) == NULL)
        E_FATAL("Failed to open audio device\n");

    /* Initialize continuous listening module */
    if ((cont = cont_ad_init(ad, ad_read)) == NULL)
        E_FATAL("Failed to initialize voice activity detection\n");
    if (ad_start_rec(ad) < 0)
        E_FATAL("Failed to start recording\n");
    if (cont_ad_calib(cont) < 0)
        E_FATAL("Failed to calibrate voice activity detection\n");

    for (;;) {
        /* Indicate listening for next utterance */
        printf("READY....\n");
        fflush(stdout);
        fflush(stderr);

        /* Wait data for next utterance */
        while ((k = cont_ad_read(cont, adbuf, 4096)) == 0)
            sleep_msec(100);

        if (k < 0)
            E_FATAL("Failed to read audio\n");

        /*
         * Non-zero amount of data received; start recognition of new utterance.
         * NULL argument to uttproc_begin_utt => automatic generation of utterance-id.
         */
        if (ps_start_utt(ps, NULL) < 0)
            E_FATAL("Failed to start utterance\n");
        ps_process_raw(ps, adbuf, k, FALSE, FALSE);
        printf("Listening...\n");
        fflush(stdout);

        /* Note timestamp for this first block of data */
        ts = cont->read_ts;

        /* Decode utterance until end (marked by a "long" silence, >1sec) */
        for (;;) {
            /* Read non-silence audio data, if any, from continuous listening module */
            if ((k = cont_ad_read(cont, adbuf, 4096)) < 0)
                E_FATAL("Failed to read audio\n");
            if (k == 0) {
                /*
                 * No speech data available; check current timestamp with most recent
                 * speech to see if more than 1 sec elapsed.  If so, end of utterance.
                 */
                if ((cont->read_ts - ts) > DEFAULT_SAMPLES_PER_SEC)
                    break;
            }
            else {
                /* New speech data received; note current timestamp */
                ts = cont->read_ts;
            }

            /*
             * Decode whatever data was read above.
             */
            rem = ps_process_raw(ps, adbuf, k, FALSE, FALSE);

            /* If no work to be done, sleep a bit */
            if ((rem == 0) && (k == 0))
                sleep_msec(20);
        }

        /*
         * Utterance ended; flush any accumulated, unprocessed A/D data and stop
         * listening until current utterance completely decoded
         */
        ad_stop_rec(ad);
        while (ad_read(ad, adbuf, 4096) >= 0);
        cont_ad_reset(cont);

        printf("Stopped listening, please wait...\n");
        fflush(stdout);
        /* Finish decoding, obtain and print result */
        ps_end_utt(ps);
        hyp = ps_get_hyp(ps, NULL, &uttid);
        printf("%s: %s\n", uttid, hyp);
        fflush(stdout);

        /* Exit if the first word spoken was GOODBYE */
        if (hyp) {
            sscanf(hyp, "%s", word);
            if (strcmp(word, "goodbye") == 0)
                break;
        }

        /* Resume A/D recording for next utterance */
        if (ad_start_rec(ad) < 0)
            E_FATAL("Failed to start recording\n");
    }

    cont_ad_close(cont);
    ad_close(ad);
}

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