1 files changed, 109 insertions, 0 deletions
diff --git a/engines/bladerunner/aud_stream.cpp b/engines/bladerunner/aud_stream.cpp
new file mode 100644
index 0000000000..b583531ecd
--- /dev/null
+++ b/engines/bladerunner/aud_stream.cpp
@@ -0,0 +1,109 @@
+/* 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.
+ *
+ */
+
+#include "bladerunner/aud_stream.h"
+
+#include "bladerunner/audio_player.h"
+
+#include "common/util.h"
+
+namespace BladeRunner {
+
+AudStream::AudStream(byte *data) : _cache(nullptr) {
+	init(data);
+}
+
+AudStream::AudStream(AudioCache *cache, int32 hash)
+		: _cache(cache), _hash(hash) {
+	_cache->incRef(_hash);
+
+	init(_cache->findByHash(_hash));
+}
+
+void AudStream::init(byte *data) {
+	_data = data;
+	_end = _data + READ_LE_UINT32(_data + 2) + 12;
+	assert(_end - _data >= 12);
+
+	_compressionType = *(_data + 11);
+
+	_deafBlockRemain = 0;
+	_p = _data + 12;
+}
+
+AudStream::~AudStream() {
+	if (_cache)
+		_cache->decRef(_hash);
+}
+
+int AudStream::readBuffer(int16 *buffer, const int numSamples) {
+	int samplesRead = 0;
+
+	if (_compressionType == 99) {
+		assert(numSamples % 2 == 0);
+
+		while (samplesRead < numSamples) {
+			if (_deafBlockRemain == 0) {
+				if (_end - _p == 0)
+					break;
+
+				assert(_end - _p >= 6);
+
+				uint16 blockSize     = READ_LE_UINT16(_p);
+				uint16 blockOutSize  = READ_LE_UINT16(_p + 2);
+				uint32 sig           = READ_LE_UINT32(_p + 4);
+				_p += 8;
+
+				assert(sig == 0xdeaf);
+				assert(_end - _p >= blockSize);
+				assert(blockOutSize = 4 * blockSize);
+
+				_deafBlockRemain = blockSize;
+			}
+
+			assert(_end - _p >= _deafBlockRemain);
+
+			int bytesConsumed = MIN<int>(_deafBlockRemain, (numSamples - samplesRead) / 2);
+
+			_decoder.decode(_p, bytesConsumed, buffer + samplesRead);
+			_p += bytesConsumed;
+			_deafBlockRemain -= bytesConsumed;
+
+			samplesRead += 2 * bytesConsumed;
+		}
+	} else {
+		samplesRead = MIN(numSamples, (int)(_end - _p) / 2);
+		for (int i = 0; i < samplesRead; i++, _p += 2) {
+			buffer[i] = READ_LE_UINT16(_p);
+		}
+	}
+
+	return samplesRead;
+}
+
+bool AudStream::rewind() {
+	_p = _data + 12;
+	_decoder.setParameters(0, 0);
+	return true;
+}
+
+} // End of namespace BladeRunner