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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/*
* The code in this file is based on information found at
* http://developer.apple.com/legacy/mac/library/documentation/mac/Sound/Sound-60.html#HEADING60-15
*
* We implement both type 1 and type 2 snd resources, but only those that are sampled
*/
#include "common/util.h"
#include "common/stream.h"
#include "audio/decoders/mac_snd.h"
#include "audio/audiostream.h"
#include "audio/decoders/raw.h"
namespace Audio {
SeekableAudioStream *makeMacSndStream(Common::SeekableReadStream *stream,
DisposeAfterUse::Flag disposeAfterUse) {
uint16 sndType = stream->readUint16BE();
if (sndType == 1) {
// "normal" snd resources
if (stream->readUint16BE() != 1) {
warning("makeMacSndStream(): Unsupported data type count");
return 0;
}
if (stream->readUint16BE() != 5) {
// 5 == sampled
warning("makeMacSndStream(): Unsupported data type");
return 0;
}
stream->readUint32BE(); // initialization option
} else if (sndType == 2) {
// old HyperCard snd resources
stream->readUint16BE(); // reference count (unused)
} else {
warning("makeMacSndStream(): Unknown format type %d", sndType);
return 0;
}
// We really should never get this as long as we have sampled data only
if (stream->readUint16BE() != 1) {
warning("makeMacSndStream(): Unsupported command count");
return 0;
}
uint16 command = stream->readUint16BE();
// 0x8050 - soundCmd (with dataOffsetFlag set): install a sampled sound as a voice
// 0x8051 - bufferCmd (with dataOffsetFlag set): play a sample sound
if (command != 0x8050 && command != 0x8051) {
warning("makeMacSndStream(): Unsupported command %04x", command);
return 0;
}
stream->readUint16BE(); // 0
uint32 soundHeaderOffset = stream->readUint32BE();
stream->seek(soundHeaderOffset);
uint32 soundDataOffset = stream->readUint32BE();
uint32 size = stream->readUint32BE();
uint16 rate = stream->readUint32BE() >> 16; // Really fixed point, but we only support integer rates
stream->readUint32BE(); // loop start
stream->readUint32BE(); // loop end
byte encoding = stream->readByte();
stream->readByte(); // base frequency
if (encoding != 0) {
// 0 == PCM
warning("makeMacSndStream(): Unsupported compression %d", encoding);
return 0;
}
stream->skip(soundDataOffset);
byte *data = (byte *)malloc(size);
assert(data);
stream->read(data, size);
if (disposeAfterUse == DisposeAfterUse::YES)
delete stream;
// Since we allocated our own buffer for the data, we must specify DisposeAfterUse::YES.
return makeRawStream(data, size, rate, Audio::FLAG_UNSIGNED);
}
} // End of namespace Audio
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