source: trunk/third/audiofile/libaudiofile/aes.c @ 17099

/*
        Audio File Library
        Copyright (C) 1998-1999, Michael Pruett <michael@68k.org>
        Copyright (C) 2000, Silicon Graphics, Inc.

        This library is free software; you can redistribute it and/or
        modify it under the terms of the GNU Library General Public
        License as published by the Free Software Foundation; either
        version 2 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
        Library General Public License for more details.

        You should have received a copy of the GNU Library 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.
*/

/*
        aes.c

        This file contains routines for dealing with AES recording data.
*/

#include <string.h>
#include <assert.h>

#include "audiofile.h"
#include "afinternal.h"
#include "util.h"

void afInitAESChannelData (AFfilesetup setup, int trackid)
{
        _TrackSetup     *track;

        if (!_af_filesetup_ok(setup))
                return;

        if ((track = _af_filesetup_get_tracksetup(setup, trackid)) == NULL)
                return;

        track->aesDataSet = AF_TRUE;
}

void afInitAESChannelDataTo (AFfilesetup setup, int trackid, int willBeData)
{
        _TrackSetup     *track;

        if (!_af_filesetup_ok(setup))
                return;

        if ((track = _af_filesetup_get_tracksetup(setup, trackid)) == NULL)
                return;

        track->aesDataSet = willBeData;
}

/*
        What is with these return values?
*/
int afGetAESChannelData (AFfilehandle file, int trackid, unsigned char buf[24])
{
        _Track *track;

        if ((track = _af_filehandle_get_track(file, trackid)) == NULL)
                return -1;

        if (track->hasAESData == AF_FALSE)
        {
                if (buf)
                        memset(buf, 0, 24);
                return 0;
        }

        if (buf)
                memcpy(buf, track->aesData, 24);

        return 1;
}

void afSetAESChannelData (AFfilehandle file, int trackid, unsigned char buf[24])
{
        _Track  *track;

        if ((track = _af_filehandle_get_track(file, trackid)) == NULL)
                return;

        if (!_af_filehandle_can_write(file))
                return;

        if (track->hasAESData)
        {
                memcpy(track->aesData, buf, 24);
        }
        else
        {
                _af_error(AF_BAD_NOAESDATA,
                        "unable to store AES channel status data for track %d",
                        trackid);
        }
}