compression.c
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/*
Audio File Library
Copyright (C) 1999-2000, 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.
*/
/*
compression.c
This file contains routines for configuring compressed audio.
*/
#include <assert.h>
#include "audiofile.h"
#include "afinternal.h"
#include "aupvlist.h"
#include "units.h"
#include "util.h"
extern _CompressionUnit _af_compression[];
int _af_compression_index_from_id (int compressionid)
{
int i;
for (i=0; i<_AF_NUM_COMPRESSION; i++)
{
if (_af_compression[i].compressionID == compressionid)
return i;
}
_af_error(AF_BAD_COMPTYPE, "compression type %d not available", compressionid);
return -1;
}
static _CompressionUnit *findCompression (int compressionid)
{
int compressionno;
compressionno = _af_compression_index_from_id(compressionid);
if (compressionno != -1)
return &_af_compression[compressionno];
return NULL;
}
int afGetCompression (AFfilehandle file, int trackid)
{
_Track *track;
if (!_af_filehandle_ok(file))
return -1;
if ((track = _af_filehandle_get_track(file, trackid)) == NULL)
return -1;
return track->f.compressionType;
}
void afInitCompression (AFfilesetup setup, int trackid, int compression)
{
_TrackSetup *track;
if (!_af_filesetup_ok(setup))
return;
if ((track = _af_filesetup_get_tracksetup(setup, trackid)) == NULL)
return;
if (findCompression(compression) == NULL)
return;
track->f.compressionType = compression;
}
#if 0
int afGetCompressionParams (AFfilehandle file, int trackid,
int *compression, AUpvlist pvlist, int numitems)
{
assert(file);
assert(trackid == AF_DEFAULT_TRACK);
}
void afInitCompressionParams (AFfilesetup setup, int trackid,
int compression, AUpvlist pvlist, int numitems)
{
assert(setup);
assert(trackid == AF_DEFAULT_TRACK);
}
#endif