SOUND: Move the Mac snd decoder from SCI to /sound

For use with Kyra1 Mac instrument samples. T7G Mac and Loom Mac also use this format for their custom instrument samples.

svn-id: r51327

engines/sci/sound/audio.cpp

@@ -36,6 +36,7 @@
 #include "sound/audiostream.h"
 #include "sound/decoders/aiff.h"
 #include "sound/decoders/flac.h"
+#include "sound/decoders/mac_snd.h"
 #include "sound/decoders/mp3.h"
 #include "sound/decoders/raw.h"
 #include "sound/decoders/vorbis.h"
@@ -338,19 +339,9 @@ Audio::RewindableAudioStream *AudioPlayer::getAudioStream(uint32 number, uint32
 		} else if (audioRes->size > 14 && READ_BE_UINT16(audioRes->data) == 1 && READ_BE_UINT16(audioRes->data + 2) == 1
 				&& READ_BE_UINT16(audioRes->data + 4) == 5 && READ_BE_UINT32(audioRes->data + 10) == 0x00018051) {
 			// Mac snd detected
-			// See http://developer.apple.com/legacy/mac/library/documentation/mac/Sound/Sound-60.html#HEADING60-15 for more details
+			Common::MemoryReadStream *sndStream = new Common::MemoryReadStream(audioRes->data, audioRes->size, DisposeAfterUse::NO);
 
-			uint32 soundHeaderOffset = READ_BE_UINT32(audioRes->data + 16);
-			assert(READ_BE_UINT32(audioRes->data + soundHeaderOffset) == 0);
-			size = READ_BE_UINT32(audioRes->data + soundHeaderOffset + 4);
-			_audioRate = READ_BE_UINT16(audioRes->data + soundHeaderOffset + 8); // Really floating point, but we're just truncating
-
-			if (*(audioRes->data + soundHeaderOffset + 20) != 0)
-				error("Unhandled Mac snd extended/compressed header");
-
-			data = (byte *)malloc(size);
-			memcpy(data, audioRes->data + soundHeaderOffset + 22, size);
-			flags = Audio::FLAG_UNSIGNED;
+			audioSeekStream = Audio::makeMacSndStream(sndStream, DisposeAfterUse::YES);
 		} else {
 			// SCI1 raw audio
 			size = audioRes->size;

sound/decoders/mac_snd.cpp

@@ -0,0 +1,116 @@
+/* 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 "sound/decoders/mac_snd.h"
+#include "sound/audiostream.h"
+#include "sound/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 floating 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

sound/decoders/mac_snd.h

@@ -0,0 +1,58 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+/**
+ * @file
+ * Sound decoder used in engines:
+ *  - sci
+ */
+
+#ifndef SOUND_MAC_SND_H
+#define SOUND_MAC_SND_H
+
+#include "common/scummsys.h"
+#include "common/types.h"
+
+namespace Common { class SeekableReadStream; }
+
+namespace Audio {
+
+class SeekableAudioStream;
+
+/**
+ * Try to load a Mac snd resource from the given seekable stream and create a SeekableAudioStream
+ * from that data.
+ *
+ * @param stream			the SeekableReadStream from which to read the snd data
+ * @param disposeAfterUse	whether to delete the stream after use
+ * @return	a new SeekableAudioStream, or NULL, if an error occurred
+ */
+SeekableAudioStream *makeMacSndStream(
+	Common::SeekableReadStream *stream,
+	DisposeAfterUse::Flag disposeAfterUse);
+
+} // End of namespace Audio
+
+#endif

sound/module.mk

@@ -17,6 +17,7 @@ MODULE_OBJS := \
 	decoders/aiff.o \
 	decoders/flac.o \
 	decoders/iff_sound.o \
+	decoders/mac_snd.o \
 	decoders/mp3.o \
 	decoders/raw.o \
 	decoders/vag.o \