Initial commit

engines/icb/sound/sound_common.cpp

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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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1999-2000 Revolution Software Ltd.
+ * This code is based on source code created by Revolution Software,
+ * used with permission.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "engines/icb/p4.h"
+#include "engines/icb/sound/direct_sound.h"
+#include "engines/icb/sound/sound_common.h"
+
+#include "common/textconsole.h"
+#include "common/stream.h"
+
+namespace ICB {
+
+// Common code between the three sound-managers
+bool8 openWav(Common::SeekableReadStream *stream, _wavHeader &header, uint32 &length, uint32 &byteOffsetInCluster, int32 &lengthInCycles) {
+
+	int32 pos = stream->pos();
+	int32 bytesRead;
+	char buff[1024];
+	bool bMore = true;
+
+	// Read the wave header
+	if (stream->read(&header, sizeof(_wavHeader)) != sizeof(_wavHeader))
+		return FALSE8;
+
+	if (FROM_LE_16(header.formatTag) != 1) {
+		warning("Only supports PCM uncompressed wav files");
+		return FALSE8;
+	}
+
+	// Find the start of the data
+	do {
+		int32 i = 0;
+		bytesRead = stream->read(buff, 256);
+		for (i = 0; i < (bytesRead - 3) && bMore; i++)
+			bMore = READ_LE_U32(buff + i) != MKTAG('a', 't', 'a', 'd');
+
+		if (bMore)
+			stream->seek(-3, SEEK_CUR);
+		else
+			stream->seek(i - bytesRead + 3, SEEK_CUR);
+
+	} while (bMore && bytesRead == 256);
+
+	if (bMore) // Can't find 'data' !
+		return FALSE8;
+
+	// Find length of data
+	length = stream->readUint32LE();
+	if (stream->err())
+		return FALSE8;
+
+	// Adjust this byte counter to represent the first data byte of the wav
+	byteOffsetInCluster = (uint32)stream->pos();
+
+	// Expected number of cycles this sample reguires to completely playback
+	lengthInCycles = (int32)ceil(((double)length / (double)FROM_LE_32(header.avgBytesPerSec)) * 12.0f * 1.215f);
+
+	stream->seek(pos);
+
+	return TRUE8;
+}
+
+} // End of namespace ICB