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engines/vcruise/sampleloop.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 VCRUISE_SAMPLELOOP_H
+#define VCRUISE_SAMPLELOOP_H
+
+#include "common/ptr.h"
+#include "common/mutex.h"
+
+#include "audio/audiostream.h"
+
+namespace Common {
+
+class ReadStream;
+
+} // End of namespace Common
+
+namespace VCruise {
+
+struct SampleLoop {
+	SampleLoop();
+
+	bool read(Common::ReadStream &stream, uint &availableBytes);
+
+	uint32 identifier;
+	uint32 type;
+	uint32 start;
+	uint32 end;
+	uint32 fraction;
+	uint32 playCount;
+};
+
+struct SampleChunk {
+	SampleChunk();
+
+	bool read(Common::ReadStream &stream, uint &availableBytes);
+
+	uint32 manufacturer;
+	uint32 product;
+	uint32 samplePeriod;
+	uint32 midiUnityNote;
+	uint32 midiPitchFraction;
+	uint32 smpteFormat;
+	uint32 smpteOffset;
+
+	// uint32 numSampleLoops;
+	// uint32 sizeOfSamplerData;
+
+	Common::Array<SampleLoop> loops;
+	Common::Array<byte> samplerData;
+};
+
+struct SoundLoopInfo {
+	SampleChunk _sampleChunk;
+
+	static Common::SharedPtr<SoundLoopInfo> readFromWaveFile(Common::SeekableReadStream &stream);
+};
+
+class SampleLoopAudioStream : public Audio::AudioStream {
+public:
+	SampleLoopAudioStream(Audio::SeekableAudioStream *baseStream, const SoundLoopInfo *loopInfo);
+	virtual ~SampleLoopAudioStream();
+
+	void stopLooping();
+
+	int readBuffer(int16 *buffer, const int numSamples) override;
+	bool isStereo() const override;
+	int getRate() const override;
+	bool endOfData() const override;
+
+private:
+	struct LoopRange {
+		LoopRange();
+
+		Audio::Timestamp _restartTimestamp;
+
+		uint _startSampleInclusive;
+		uint _endSampleExclusive;
+		uint _playCount;
+	};
+
+	Common::Mutex _mutex;
+
+	int _currentSampleOffset;
+	int _currentLoop;
+	uint _currentLoopIteration;
+	int _streamFrames;
+	int _streamSamples;
+	bool _terminated;
+	bool _ignoreLoops;
+
+	Common::Array<LoopRange> _loopRanges;
+
+	Audio::SeekableAudioStream *_baseStream;
+};
+
+} // End of namespace VCruise
+
+#endif