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mac_snd.cpp

/* 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/textconsole.h"
#include "common/stream.h"

#include "audio/decoders/mac_snd.h"
#include "audio/decoders/raw.h"

namespace Audio {

00041 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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