LASTEXPRESS: Merge in the engine.

svn-id: r53579

1 files changed, 141 insertions, 0 deletions

diff --git a/engines/lastexpress/data/snd.cpp b/engines/lastexpress/data/snd.cpp
new file mode 100644
index 0000000000..496bd58772
--- /dev/null
+++ b/engines/lastexpress/data/snd.cpp
@@ -0,0 +1,141 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+// Based on the Xentax Wiki documentation:
+// http://wiki.xentax.com/index.php/The_Last_Express_SND
+
+#include "lastexpress/data/snd.h"
+
+#include "lastexpress/debug.h"
+
+#include "sound/decoders/adpcm.h"
+#include "sound/audiostream.h"
+
+namespace LastExpress {
+
+//////////////////////////////////////////////////////////////////////////
+// Sound
+//////////////////////////////////////////////////////////////////////////
+SimpleSound::SimpleSound() : _size(0), _blocks(0), _blockSize(0) {}
+
+SimpleSound::~SimpleSound() {
+	stop();
+}
+
+// Stop the sound
+void SimpleSound::stop() const {
+	g_system->getMixer()->stopHandle(_handle);
+}
+
+void SimpleSound::loadHeader(Common::SeekableReadStream *in) {
+	_size = in->readUint32LE();
+	_blocks = in->readUint16LE();
+	debugC(5, kLastExpressDebugSound, "    sound header data: size=\"%d\", %d blocks", _size, _blocks);
+
+	assert (_size % _blocks == 0);
+	_blockSize = _size / _blocks;
+}
+
+Audio::AudioStream *SimpleSound::makeDecoder(Common::SeekableReadStream *in, uint32 size) const {
+	return Audio::makeADPCMStream(in, DisposeAfterUse::YES, size, Audio::kADPCMMSImaLastExpress, 44100, 1, _blockSize);
+}
+
+void SimpleSound::play(Audio::AudioStream *as) {
+	g_system->getMixer()->playStream(Audio::Mixer::kPlainSoundType, &_handle, as);
+}
+
+//////////////////////////////////////////////////////////////////////////
+// StreamedSound
+//////////////////////////////////////////////////////////////////////////
+StreamedSound::StreamedSound() {}
+StreamedSound::~StreamedSound() {}
+
+bool StreamedSound::load(Common::SeekableReadStream *stream) {
+	if (!stream)
+		return false;
+
+	g_system->getMixer()->stopHandle(_handle);
+
+	loadHeader(stream);
+
+	// Start decoding the input stream
+	Audio::AudioStream *as = makeDecoder(stream, _size);
+
+	// Start playing the decoded audio stream
+	play(as);
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+// StreamedSound
+//////////////////////////////////////////////////////////////////////////
+AppendableSound::AppendableSound() : SimpleSound() {
+	// Create an audio stream where the decoded chunks will be appended
+	_as = Audio::makeQueuingAudioStream(44100, false);
+	_finished = false;
+
+	// Start playing the decoded audio stream
+	play(_as);
+
+	// Initialize the block size
+	// TODO: get it as an argument?
+	_blockSize = 739;
+}
+
+AppendableSound::~AppendableSound() {
+	finish();
+
+	_as = NULL;
+}
+
+void AppendableSound::queueBuffer(const byte *data, uint32 size) {
+	Common::MemoryReadStream *buffer = new Common::MemoryReadStream(data, size);
+	queueBuffer(buffer);
+}
+
+void AppendableSound::queueBuffer(Common::SeekableReadStream *bufferIn) {
+	if (!_as)
+		error("AppendableSound::queueBuffer - internal error: the audio stream is invalid!");
+
+	// Setup the ADPCM decoder
+	uint32 sizeIn = (uint32)bufferIn->size();
+	Audio::AudioStream *adpcm = makeDecoder(bufferIn, sizeIn);
+
+	// Queue the stream
+	_as->queueAudioStream(adpcm);
+}
+
+void AppendableSound::finish() {
+	if (!_as)
+		error("AppendableSound::queueBuffer - internal error: the audio stream is invalid!");
+
+	if (!_finished)
+		_as->finish();
+
+	_finished = true;
+}
+
+} // End of namespace LastExpress