/*
 * SDL_sound -- An abstract sound format decoding API.
 * Copyright (C) 2001  Ryan C. Gordon.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * FMT decoder for SDL_sound.
 *
 * This driver handles FMT audio data. Blahblahblah... The author should
 *  have done a search and replace on "fmt" and "FMT" and changed this
 *  comment. This is the default comment in the skeleton decoder file...
 *
 * Please see the file LICENSE in the source's root directory.
 *
 *  This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "SDL_sound.h"

#define __SDL_SOUND_INTERNAL__
#include "SDL_sound_internal.h"

#if (!defined SOUND_SUPPORTS_FMT)
#error SOUND_SUPPORTS_FMT must be defined.
#endif


static int FMT_open(Sound_Sample *sample, const char *ext);
static void FMT_close(Sound_Sample *sample);
static Uint32 FMT_read(Sound_Sample *sample);

const Sound_DecoderFunctions __Sound_DecoderFunctions_FMT =
{
    {
        "FMT",
        "FMT audio format description",
        "Ryan C. Gordon <icculus@clutteredmind.org>",
        "http://www.icculus.org/SDL_sound/"
    },

    FMT_open,       /* open() method       */
    FMT_close,      /* close() method       */
    FMT_read        /* read() method       */
};


static int FMT_open(Sound_Sample *sample, const char *ext)
{
    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
    SDL_RWops *rw = internal->rw;

    if (can NOT accept the data)
    {
        Sound_SetError("FMT: expected X, got Y.");
        return(0);
    } /* if */

    _D(("FMT: Accepting data stream.\n"));
    set up sample->actual;
    sample->flags = SOUND_SAMPLEFLAG_NONE;
    return(1); /* we'll handle this data. */
} /* FMT_open */


static void FMT_close(Sound_Sample *sample)
{
    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
    clean up anything you put into internal->decoder_private;
} /* FMT_close */


static Uint32 FMT_read(Sound_Sample *sample)
{
    Uint32 retval;
    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;

        /*
         * We don't actually do any decoding, so we read the fmt data
         *  directly into the internal buffer...
         */
    retval = SDL_RWread(internal->rw, internal->buffer,
                        1, internal->buffer_size);

    (or whatever. Do some decoding here...)

        /* Make sure the read went smoothly... */
    if (retval == 0)
        sample->flags |= SOUND_SAMPLEFLAG_EOF;

    else if (retval == -1)
        sample->flags |= SOUND_SAMPLEFLAG_ERROR;

        /* (next call this EAGAIN may turn into an EOF or error.) */
    else if (retval < internal->buffer_size)
        sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;

    (or whatever. retval == number of bytes you put in internal->buffer).

    return(retval);
} /* FMT_read */


/* end of fmt.c ... */