SCUMM: Unified some more SMUSH audio channel code

svn-id: r24538

1 files changed, 109 insertions, 0 deletions

diff --git a/engines/scumm/smush/channel.cpp b/engines/scumm/smush/channel.cpp
new file mode 100644
index 0000000000..81019ab41d
--- /dev/null
+++ b/engines/scumm/smush/channel.cpp
@@ -0,0 +1,109 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2002-2006 The ScummVM project
+ *
+ * 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/stdafx.h"
+#include "scumm/smush/channel.h"
+
+namespace Scumm {
+
+SmushChannel::SmushChannel(int32 track) :
+	_track(track),
+	_tbuffer(0),
+	_tbufferSize(0),
+	_sbuffer(0),
+	_sbufferSize(0),
+	_dataSize(-1),
+	_inData(false),
+	_volume(0),
+	_pan(0) {
+}
+
+SmushChannel::~SmushChannel() {
+	delete[] _tbuffer;
+	delete[] _sbuffer;
+}
+
+void SmushChannel::processBuffer() {
+	assert(_tbuffer != 0);
+	assert(_tbufferSize != 0);
+	assert(_sbuffer == 0);
+	assert(_sbufferSize == 0);
+
+	if (_inData) {
+		if (_dataSize < _tbufferSize) {
+			int32 offset = _dataSize;
+			while (handleSubTags(offset))
+				;
+			_sbufferSize = _dataSize;
+			_sbuffer = _tbuffer;
+			if (offset < _tbufferSize) {
+				int new_size = _tbufferSize - offset;
+				_tbuffer = new byte[new_size];
+				if (!_tbuffer)
+					error("smush channel failed to allocate memory");
+				memcpy(_tbuffer, _sbuffer + offset, new_size);
+				_tbufferSize = new_size;
+			} else {
+				_tbuffer = 0;
+				_tbufferSize = 0;
+			}
+			if (_sbufferSize == 0) {
+				delete []_sbuffer;
+				_sbuffer = 0;
+			}
+		} else {
+			_sbufferSize = _tbufferSize;
+			_sbuffer = _tbuffer;
+			_tbufferSize = 0;
+			_tbuffer = 0;
+		}
+	} else {
+		int32 offset = 0;
+		while (handleSubTags(offset))
+			;
+		if (_inData) {
+			_sbufferSize = _tbufferSize - offset;
+			assert(_sbufferSize);
+			_sbuffer = new byte[_sbufferSize];
+			if (!_sbuffer)
+				error("smush channel failed to allocate memory");
+			memcpy(_sbuffer, _tbuffer + offset, _sbufferSize);
+			delete []_tbuffer;
+			_tbuffer = 0;
+			_tbufferSize = 0;
+		} else {
+			if (offset) {
+				byte *old = _tbuffer;
+				int32 new_size = _tbufferSize - offset;
+				_tbuffer = new byte[new_size];
+				if (!_tbuffer)
+					error("smush channel failed to allocate memory");
+				memcpy(_tbuffer, old + offset, new_size);
+				_tbufferSize = new_size;
+				delete []old;
+			}
+		}
+	}
+}
+
+
+} // End of namespace Scumm