sampleloop.h

/* 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