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117 lines
3.5 KiB
C++
117 lines
3.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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/*
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* The code in this file is based on information found at
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* http://developer.apple.com/legacy/mac/library/documentation/mac/Sound/Sound-60.html#HEADING60-15
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*
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* We implement both type 1 and type 2 snd resources, but only those that are sampled
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*/
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#include "common/util.h"
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#include "common/stream.h"
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#include "audio/decoders/mac_snd.h"
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#include "audio/audiostream.h"
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#include "audio/decoders/raw.h"
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namespace Audio {
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SeekableAudioStream *makeMacSndStream(Common::SeekableReadStream *stream,
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DisposeAfterUse::Flag disposeAfterUse) {
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uint16 sndType = stream->readUint16BE();
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if (sndType == 1) {
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// "normal" snd resources
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if (stream->readUint16BE() != 1) {
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warning("makeMacSndStream(): Unsupported data type count");
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return 0;
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}
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if (stream->readUint16BE() != 5) {
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// 5 == sampled
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warning("makeMacSndStream(): Unsupported data type");
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return 0;
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}
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stream->readUint32BE(); // initialization option
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} else if (sndType == 2) {
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// old HyperCard snd resources
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stream->readUint16BE(); // reference count (unused)
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} else {
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warning("makeMacSndStream(): Unknown format type %d", sndType);
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return 0;
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}
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// We really should never get this as long as we have sampled data only
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if (stream->readUint16BE() != 1) {
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warning("makeMacSndStream(): Unsupported command count");
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return 0;
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}
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uint16 command = stream->readUint16BE();
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// 0x8050 - soundCmd (with dataOffsetFlag set): install a sampled sound as a voice
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// 0x8051 - bufferCmd (with dataOffsetFlag set): play a sample sound
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if (command != 0x8050 && command != 0x8051) {
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warning("makeMacSndStream(): Unsupported command %04x", command);
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return 0;
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}
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stream->readUint16BE(); // 0
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uint32 soundHeaderOffset = stream->readUint32BE();
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stream->seek(soundHeaderOffset);
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uint32 soundDataOffset = stream->readUint32BE();
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uint32 size = stream->readUint32BE();
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uint16 rate = stream->readUint32BE() >> 16; // Really fixed point, but we only support integer rates
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stream->readUint32BE(); // loop start
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stream->readUint32BE(); // loop end
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byte encoding = stream->readByte();
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stream->readByte(); // base frequency
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if (encoding != 0) {
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// 0 == PCM
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warning("makeMacSndStream(): Unsupported compression %d", encoding);
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return 0;
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}
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stream->skip(soundDataOffset);
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byte *data = (byte *)malloc(size);
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assert(data);
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stream->read(data, size);
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if (disposeAfterUse == DisposeAfterUse::YES)
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delete stream;
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// Since we allocated our own buffer for the data, we must specify DisposeAfterUse::YES.
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return makeRawStream(data, size, rate, Audio::FLAG_UNSIGNED);
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}
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} // End of namespace Audio
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