saud_stream.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 SCUMM_SMUSH_SAUD_STREAM_H
#define SCUMM_SMUSH_SAUD_STREAM_H
 
#include "audio/audiostream.h"
#include "common/array.h"
#include "common/mutex.h"
#include "scumm/smush/saud.h"
 
namespace Audio {
class RateConverter;
}
 
namespace Scumm {
 
class SaudStreamState {
public:
    SaudStreamState();
    void reset();
    byte variable(byte id) const;
 
private:
    friend class SaudStream;
    Common::Mutex _mutex;
    byte _variables[256];
    int _masterVolume;
};
 
// Plays an in-memory SAUD through the same STRK interpreter as RebelAudio.
// The caller keeps samples, script and shared state alive until playback stops.
class SaudStream : public Audio::AudioStream {
public:
    enum { kRate = 22050 };
    SaudStream(const Common::Array<byte> &samples, const Common::Array<byte> &script,
        uint rate, SaudStreamState &state, byte volume, int8 pan);
    ~SaudStream() override;
 
    int readBuffer(int16 *buffer, int numSamples) override;
    bool isStereo() const override { return true; }
    int getRate() const override { return kRate; }
    bool endOfData() const override { return _ended; }
    // Advance the script and audio together before handing the stream to the mixer.
    void skip(uint64 frames);
 
private:
    bool startSpan(const SaudSpan &span);
 
    const Common::Array<byte> &_samples;
    SaudStreamState &_state;
    SaudScript _script;
    Audio::AudioStream *_raw;
    Audio::RateConverter *_converter;
    byte _volume, _pan;
    bool _ended;
};
 
} // End of namespace Scumm
 
#endif