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engines/tinsel/adpcm.h

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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/>.
+ *
+ */
+
+#ifndef TINSEL_ADPCM_H
+#define TINSEL_ADPCM_H
+
+#include "audio/decoders/adpcm_intern.h"
+
+namespace Tinsel {
+
+class Tinsel_ADPCMStream : public Audio::ADPCMStream {
+protected:
+	struct {
+		// Tinsel
+		double predictor;
+		double K0, K1;
+		double d0, d1;
+	} _status;
+
+	void reset() override {
+		ADPCMStream::reset();
+		memset(&_status, 0, sizeof(_status));
+	}
+
+	int16 decodeTinsel(int16, double);
+	void readBufferTinselHeader();
+
+public:
+	Tinsel_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
+		: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
+
+		if (blockAlign == 0)
+			error("Tinsel_ADPCMStream(): blockAlign isn't specified");
+
+		if (channels != 1)
+			error("Tinsel_ADPCMStream(): Tinsel ADPCM only supports mono");
+
+		memset(&_status, 0, sizeof(_status));
+	}
+
+};
+
+class Tinsel4_ADPCMStream : public Tinsel_ADPCMStream {
+public:
+	Tinsel4_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
+		: Tinsel_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}
+
+	int readBuffer(int16 *buffer, const int numSamples) override;
+};
+
+class Tinsel6_ADPCMStream : public Tinsel_ADPCMStream {
+protected:
+	uint8 _chunkPos;
+	uint16 _chunkData;
+
+	void reset() override {
+		ADPCMStream::reset();
+		_chunkPos = 0;
+		_chunkData = 0;
+	}
+
+public:
+	Tinsel6_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
+		: Tinsel_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
+		_chunkPos = 0;
+		_chunkData = 0;
+	}
+
+	int readBuffer(int16 *buffer, const int numSamples) override;
+};
+
+class Tinsel8_ADPCMStream : public Tinsel_ADPCMStream {
+public:
+	Tinsel8_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
+		: Tinsel_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}
+
+	int readBuffer(int16 *buffer, const int numSamples) override;
+};
+
+
+} // End of namespace Tinsel
+
+#endif