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engines/zvision/sound/zork_raw.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 ZVISION_ZORK_RAW_H
+#define ZVISION_ZORK_RAW_H
+
+#include "audio/audiostream.h"
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace ZVision {
+
+class ZVision;
+
+struct SoundParams {
+	char identifier;
+	uint32 rate;
+	bool stereo;
+	bool packed;
+	bool bits16;
+};
+
+/**
+ * This is a ADPCM stream-reader, this class holds context for multi-chunk reading and no buffers.
+ */
+class RawChunkStream {
+public:
+	RawChunkStream(bool stereo);
+
+	~RawChunkStream() {
+	}
+private:
+	uint _stereo;
+
+	/**
+	 * Holds the frequency and index from the last sample
+	 * 0 holds the left channel, 1 holds the right channel
+	 */
+	struct {
+		int32 sample;
+		int16 index;
+	} _lastSample[2];
+
+	static const int16 _stepAdjustmentTable[8];
+	static const int32 _amplitudeLookupTable[89];
+
+public:
+
+	struct RawChunk {
+		int16 *data;
+		uint32 size;
+	};
+
+	void init();
+	//Read next audio portion in new stream (needed for avi), return structure with buffer
+	RawChunk readNextChunk(Common::SeekableReadStream *stream);
+	//Read numSamples from stream to buffer
+	int readBuffer(int16 *buffer, Common::SeekableReadStream *stream, const int numSamples);
+};
+
+/**
+ * This is a stream, which allows for playing raw ADPCM data from a stream.
+ */
+class RawZorkStream : public Audio::RewindableAudioStream {
+public:
+	RawZorkStream(uint32 rate, bool stereo, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream);
+
+	~RawZorkStream() override {
+	}
+
+public:
+	static const SoundParams _zNemSoundParamLookupTable[32];
+	static const SoundParams _zgiSoundParamLookupTable[24];
+
+private:
+	const int _rate;                                           // Sample rate of stream
+	Audio::Timestamp _playtime;                                // Calculated total play time
+	Common::DisposablePtr<Common::SeekableReadStream> _stream; // Stream to read data from
+	bool _endOfData;                                           // Whether the stream end has been reached
+	uint _stereo;
+
+	RawChunkStream _streamReader;
+
+public:
+	int readBuffer(int16 *buffer, const int numSamples) override;
+
+	bool isStereo() const override {
+		return _stereo;
+	}
+	bool endOfData() const override {
+		return _endOfData;
+	}
+
+	int getRate() const override {
+		return _rate;
+	}
+	Audio::Timestamp getLength() const {
+		return _playtime;
+	}
+
+	bool rewind() override;
+};
+
+/**
+ * Creates an audio stream, which plays from the given stream.
+ *
+ * @param stream     Stream object to play from.
+ * @param rate       Rate of the sound data.
+ * @param dispose    AfterUse Whether to delete the stream after use.
+ * @return           The new SeekableAudioStream (or 0 on failure).
+ */
+Audio::RewindableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream,
+		int rate,
+		bool stereo,
+		DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);
+
+Audio::RewindableAudioStream *makeRawZorkStream(const Common::Path &filePath, ZVision *engine);
+
+} // End of namespace ZVision
+
+#endif