audiostream.h

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#ifndef AUDIO_AUDIOSTREAM_H
#define AUDIO_AUDIOSTREAM_H

#include "common/ptr.h"
#include "common/scummsys.h"
#include "common/str.h"
#include "common/types.h"

#include "audio/timestamp.h"

namespace Common {
class SeekableReadStream;
}

namespace Audio {

class AudioStream {
public:
    virtual ~AudioStream() {}

    virtual int readBuffer(int16 *buffer, const int numSamples) = 0;

    virtual bool isStereo() const = 0;

    virtual int getRate() const = 0;

    virtual bool endOfData() const = 0;

    virtual bool endOfStream() const { return endOfData(); }
};

class RewindableAudioStream : public virtual AudioStream {
public:
    virtual bool rewind() = 0;
};

class LoopingAudioStream : public AudioStream {
public:
    LoopingAudioStream(RewindableAudioStream *stream, uint loops, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES, bool rewind = true);

    int readBuffer(int16 *buffer, const int numSamples);
    bool endOfData() const;
    bool endOfStream() const;

    bool isStereo() const { return _parent->isStereo(); }
    int getRate() const { return _parent->getRate(); }

    uint getCompleteIterations() const { return _completeIterations; }
private:
    Common::DisposablePtr<RewindableAudioStream> _parent;

    uint _loops;
    uint _completeIterations;
};

AudioStream *makeLoopingAudioStream(RewindableAudioStream *stream, uint loops);

class SeekableAudioStream : public virtual RewindableAudioStream {
public:
    static SeekableAudioStream *openStreamFile(const Common::String &basename);

    bool seek(uint32 where) {
        return seek(Timestamp(where, getRate()));
    }

    virtual bool seek(const Timestamp &where) = 0;

    virtual Timestamp getLength() const = 0;

    virtual bool rewind() { return seek(0); }
};

AudioStream *makeLoopingAudioStream(SeekableAudioStream *stream, Timestamp start, Timestamp end, uint loops);

class SubLoopingAudioStream : public AudioStream {
public:
    SubLoopingAudioStream(SeekableAudioStream *stream, uint loops,
                          const Timestamp loopStart,
                          const Timestamp loopEnd,
                          DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);

    int readBuffer(int16 *buffer, const int numSamples);
    bool endOfData() const;
    bool endOfStream() const;

    bool isStereo() const { return _parent->isStereo(); }
    int getRate() const { return _parent->getRate(); }
private:
    Common::DisposablePtr<SeekableAudioStream> _parent;

    uint _loops;
    Timestamp _pos;
    Timestamp _loopStart, _loopEnd;

    bool _done;
};


class SubSeekableAudioStream : public SeekableAudioStream {
public:
    SubSeekableAudioStream(SeekableAudioStream *parent, const Timestamp start, const Timestamp end, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);

    int readBuffer(int16 *buffer, const int numSamples);

    bool isStereo() const { return _parent->isStereo(); }

    int getRate() const { return _parent->getRate(); }

    bool endOfData() const { return (_pos >= _length) || _parent->endOfData(); }
    bool endOfStream() const { return (_pos >= _length) || _parent->endOfStream(); }

    bool seek(const Timestamp &where);

    Timestamp getLength() const { return _length; }
private:
    Common::DisposablePtr<SeekableAudioStream> _parent;

    const Timestamp _start;
    const Timestamp _length;
    Timestamp _pos;
};

class QueuingAudioStream : public Audio::AudioStream {
public:

    virtual void queueAudioStream(Audio::AudioStream *audStream,
                                  DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES) = 0;

    void queueBuffer(byte *data, uint32 size, DisposeAfterUse::Flag disposeAfterUse, byte flags);

    virtual void finish() = 0;

    virtual uint32 numQueuedStreams() const = 0;
};

QueuingAudioStream *makeQueuingAudioStream(int rate, bool stereo);

Timestamp convertTimeToStreamPos(const Timestamp &where, int rate, bool isStereo);

AudioStream *makeLimitingAudioStream(AudioStream *parentStream, const Timestamp &length, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);

class PacketizedAudioStream : public virtual AudioStream {
public:
    virtual ~PacketizedAudioStream() {}

    virtual void queuePacket(Common::SeekableReadStream *data) = 0;

    virtual void finish() = 0;
};

class StatelessPacketizedAudioStream : public PacketizedAudioStream {
public:
    StatelessPacketizedAudioStream(uint rate, uint channels) :
        _rate(rate), _channels(channels), _stream(makeQueuingAudioStream(rate, channels == 2)) {}
    virtual ~StatelessPacketizedAudioStream() {}

    // AudioStream API
    bool isStereo() const { return _channels == 2; }
    int getRate() const { return _rate; }
    int readBuffer(int16 *data, const int numSamples) { return _stream->readBuffer(data, numSamples); }
    bool endOfData() const { return _stream->endOfData(); }
    bool endOfStream() const { return _stream->endOfStream(); }

    // PacketizedAudioStream API
    void queuePacket(Common::SeekableReadStream *data) { _stream->queueAudioStream(makeStream(data)); }
    void finish() { _stream->finish(); }

    uint getChannels() const { return _channels; }

protected:
    virtual AudioStream *makeStream(Common::SeekableReadStream *data) = 0;

private:
    uint _rate;
    uint _channels;
    Common::ScopedPtr<QueuingAudioStream> _stream;
};

AudioStream *makeNullAudioStream();

} // End of namespace Audio

#endif