src/libsphinxad/ad_irix.c

/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 1999-2001 Carnegie Mellon University.  All rights
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *
 * 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 
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/*
 * ad.c -- Wraps a "sphinx-II standard" audio interface around the basic audio
 *              utilities.
 * 
 * HISTORY
 * 
 * 11-Jun-96    M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University.
 *              Modified to conform to new A/D API.
 * 
 * 12-May-96    M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University.
 *              Dummy template created.
 */

#include <stdio.h>
#include <string.h>
#include <dmedia/audio.h>
#include <config.h>

#include "prim_type.h"
#include "ad.h"

#define QUIT(x)         {fprintf x; exit(-1);}

ad_rec_t *
ad_open_sps(int32 samples_per_sec)
{
    // fprintf(stderr, "A/D library not implemented\n");
    ad_rec_t *handle;
    ALpv pv;
    int device = AL_DEFAULT_INPUT;
    ALconfig portconfig = alNewConfig();
    ALport port;
    int32 sampleRate;
    long long gainValue = alDoubleToFixed(8.5);

    pv.param = AL_GAIN;
    pv.sizeIn = 1;
    pv.value.ptr = &gainValue;

    if (alSetParams(device, &pv, 1) < 0) {
        fprintf(stderr, "setparams failed: %s\n",
                alGetErrorString(oserror()));
        return NULL;
    }


    pv.param = AL_RATE;
    pv.value.ll = alDoubleToFixed(samples_per_sec);

    if (alSetParams(device, &pv, 1) < 0) {
        fprintf(stderr, "setparams failed: %s\n",
                alGetErrorString(oserror()));
        return NULL;
    }

    if (pv.sizeOut < 0) {
        /*
         * Not all devices will allow setting of AL_RATE (for example, digital 
         * inputs run only at the frequency of the external device).  Check
         * to see if the rate was accepted.
         */
        fprintf(stderr,
                "AL_RATE was not accepted on the given resource\n");
        return NULL;
    }

    if (alGetParams(device, &pv, 1) < 0) {
        fprintf(stderr, "getparams failed: %s\n",
                alGetErrorString(oserror()));
    }

    sampleRate = (int32) alFixedToDouble(pv.value.ll);
#if 0
    printf("sample rate is set to %d\n", sampleRate);
#endif

    if (alSetChannels(portconfig, 1) < 0) {
        fprintf(stderr, "alSetChannels failed: %s\n",
                alGetErrorString(oserror()));
        return NULL;
    }

    port = alOpenPort(" Sphinx-II input port", "r", portconfig);

    if (!port) {
        fprintf(stderr, "alOpenPort failed: %s\n",
                alGetErrorString(oserror()));
        return NULL;
    }
    if ((handle = (ad_rec_t *) calloc(1, sizeof(ad_rec_t))) == NULL) {
        fprintf(stderr, "calloc(%d) failed\n", sizeof(ad_rec_t));
        abort();
    }

    handle->audio = port;
    handle->recording = 0;
    handle->sps = sampleRate;
    handle->bps = sizeof(int16);

    alFreeConfig(portconfig);

    return handle;
}

ad_rec_t *
ad_open(void)
{
    return ad_open_sps(DEFAULT_SAMPLES_PER_SEC);
}

int32
ad_start_rec(ad_rec_t * r)
{
    return 0;
}

int32
ad_stop_rec(ad_rec_t * r)
{
    /* how do we start/stop recording on an sgi? */
    return 0;
}

int32
ad_read(ad_rec_t * r, int16 * buf, int32 max)
{
    int32 length = alGetFilled(r->audio);

    if (length > max) {
        alReadFrames(r->audio, buf, max);
        return max;
    }
    else {
        alReadFrames(r->audio, buf, length);
        return length;
    }
}

int32
ad_close(ad_rec_t * r)
{
    if (r->audio)
        alClosePort(r->audio);
    free(r);
    return 0;
}

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