Initial commit

audio/decoders/iff_sound.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 "audio/decoders/iff_sound.h"
+#include "audio/audiostream.h"
+#include "audio/decoders/raw.h"
+#include "common/formats/iff_container.h"
+#include "common/func.h"
+
+namespace Audio {
+
+struct Voice8Header {
+	uint32	oneShotHiSamples;
+	uint32	repeatHiSamples;
+	uint32	samplesPerHiCycle;
+	uint16	samplesPerSec;
+	byte	octaves;
+	byte	compression;
+	uint32	volume;
+
+	Voice8Header() {
+		memset(this, 0, sizeof(Voice8Header));
+	}
+
+	void load(Common::ReadStream &stream);
+};
+
+void Voice8Header::load(Common::ReadStream &stream) {
+	oneShotHiSamples = stream.readUint32BE();
+	repeatHiSamples = stream.readUint32BE();
+	samplesPerHiCycle = stream.readUint32BE();
+	samplesPerSec = stream.readUint16BE();
+	octaves = stream.readByte();
+	compression = stream.readByte();
+	volume = stream.readUint32BE();
+}
+
+
+
+struct A8SVXLoader {
+	Voice8Header _header;
+	int8 *_data;
+	uint32 _dataSize;
+
+	void load(Common::ReadStream &input) {
+		Common::IFFParser parser(&input);
+		Common::Functor1Mem< Common::IFFChunk&, bool, A8SVXLoader > c(this, &A8SVXLoader::callback);
+		parser.parse(c);
+	}
+
+	bool callback(Common::IFFChunk &chunk) {
+		switch (chunk._type) {
+		case ID_VHDR:
+			_header.load(*chunk._stream);
+			break;
+
+		case ID_BODY:
+			_dataSize = chunk._size;
+			_data = (int8 *)malloc(_dataSize);
+			assert(_data);
+			loadData(chunk._stream);
+			return true;
+
+		default:
+			break;
+		}
+
+		return false;
+	}
+
+	void loadData(Common::ReadStream *stream) {
+		switch (_header.compression) {
+		case 0:
+			stream->read(_data, _dataSize);
+			break;
+
+		case 1:
+			// implement other formats here
+			error("compressed IFF audio is not supported");
+			break;
+
+		default:
+			break;
+		}
+
+	}
+};
+
+
+AudioStream *make8SVXStream(Common::ReadStream &input, bool loop) {
+	A8SVXLoader loader;
+	loader.load(input);
+
+	SeekableAudioStream *stream = Audio::makeRawStream((byte *)loader._data, loader._dataSize, loader._header.samplesPerSec, 0);
+
+	uint32 loopStart = 0, loopEnd = 0;
+	if (loop) {
+		// the standard way to loop 8SVX audio implies use of the oneShotHiSamples and
+		// repeatHiSamples fields
+		loopStart = 0;
+		loopEnd = loader._header.oneShotHiSamples + loader._header.repeatHiSamples;
+
+		if (loopStart != loopEnd) {
+			return new SubLoopingAudioStream(stream, 0,
+					Timestamp(0, loopStart, loader._header.samplesPerSec),
+					Timestamp(0, loopEnd, loader._header.samplesPerSec));
+		}
+	}
+
+	return stream;
+}
+
+}