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daisylibao.c

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/***************************************************************************
 *   Copyright (C) 2006 by André Lindhjem <belgarat@sdf.lonestar.org>,     *
 *                         Kjetil Holien <kjetil.holien@gmail.com>,        *
 *                         Terje Risa <terje.risa@gmail.com> &             *
 *                         Øyvind Nerbråten <oyvind@nerbraten.com>         *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************
 *
 * \file daisylibao.c
 * \author André Lindhjem, Kjetil Holien, Terje Risa & Øyvind Nerbråten
 * \date 15.02.2006
 *
 * An interface against libao. Audio decoders should use this instead of using libao directly.
 */

#include <ao/ao.h>
#include <stdio.h>
#include <stdbool.h>
#include <errno.h>
#include <assert.h>

#include "daisylibao.h"
#include "common.h"
#include "audio.h"
#include "report.h"
#include "snprintf/snprintf.h"



/* ************************************************** *
 *          Static function declarations              *
 * ************************************************** */

static
void ao_open_live_error (void);



/* ************************************************** *
 *          Static function definitions               *
 * ************************************************** */

static
void ao_open_live_error (void)
{
    switch (errno)
    {
        case AO_ENODRIVER:
            report ("No driver corresponts to driver ID.", REP_ERROR);
            break;
        case AO_ENOTLIVE:
            report ("This driver is not a live output device.", REP_ERROR);
            break;
        case AO_EBADOPTION:
            report ("A valid option key has an invalid value.", REP_ERROR);
            break;
        case AO_EOPENDEVICE:
            report ("Cannot open the device.", REP_ERROR);
            break;
        case AO_EFAIL:
            report ("Unknown reason.", REP_ERROR);
            break;
        default:
            report ("ao_open_live_error called with unknown error", REP_ERROR);
            break;
    }
}



/* ************************************************** *
 *          Global function definitions               *
 * ************************************************** */

ao_device * libao_initiate (int byte_format, int channels, int samplerate)
{
    ao_device *device = NULL;
    
    ao_sample_format format;
    int libao_driver_id = -1;

    ao_initialize ();
    libao_driver_id =  ao_default_driver_id ();
    if (libao_driver_id == -1) {
        report("Could not get a valid driver ID", REP_ERROR);
        return false;
    }
    format.bits = 16; /* Do decoder always give us 16bits? */
/*  format.byte_format = AO_FMT_LITTLE; */
    format.byte_format = byte_format;
    format.channels = channels;
    format.rate = samplerate;

    device = ao_open_live (libao_driver_id, &format, NULL);
    if (device == NULL)
    {
        ao_open_live_error();
        return NULL;
    }
    else if (DEBUG_LIBAO)
    {
        char msg[STRLEN];
        report ("libao initialized", REP_DEBUG);
        snprintf (msg, STRLEN, "libao info:\n\tbyte_format: %d\n\tchannels: %d\n\tsamplerate: %d", byte_format, channels, samplerate);
        report (msg, REP_DEBUG);
    }
    return device;
}

int libao_play (ao_device *device, void *output_samples, int num_bytes)
{
    return ao_play(device, output_samples, num_bytes);
}

void libao_terminate (ao_device *device)
{
    ao_close (device);
    ao_shutdown ();
    if (DEBUG_LIBAO) report ("libao closed", REP_DEBUG);
}

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