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engines/chewy/audio/chewy_voc.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.
+ *
+ * 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 "chewy/audio/chewy_voc.h"
+
+#include "common/stream.h"
+
+namespace Chewy {
+
+ChewyVocStream::ChewyVocStream(Common::SeekableReadStream* stream, DisposeAfterUse::Flag disposeAfterUse) :
+		VocStream(stream, true, disposeAfterUse) {
+	removeHeaders();
+}
+
+void ChewyVocStream::removeHeaders() {
+	// Check the sample blocks for non-standard headers.
+	for (auto &block : _blocks) {
+		if (block.code == 1 && block.sampleBlock.samples > 80) {
+			// Found a sample block. Check for the headers.
+			int headerSize = 0;
+			if (_stream->readUint32BE() == FOURCC_RIFF) {
+				// Found a RIFF header. 
+				headerSize = 44;
+			} else {
+				_stream->seek(block.sampleBlock.offset + 76);
+				if (_stream->readUint32BE() == FOURCC_SCRS) {
+					// Found an SCRS (?) header.
+					headerSize = 80;
+				}
+			}
+
+			if (headerSize > 0) {
+				// Move the offset past the header and adjust the length.
+				block.sampleBlock.offset += headerSize;
+				block.sampleBlock.samples -= headerSize;
+				_length = _length.addFrames(-headerSize);
+			}
+		}
+	}
+
+	// Reset the stream.
+	rewind();
+}
+
+} // End of namespace Chewy