sound.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 MOHAWK_SOUND_H
#define MOHAWK_SOUND_H
 
#include "common/array.h"
#include "common/scummsys.h"
#include "common/str.h"
#include "common/stream.h"
 
#include "audio/mixer.h"
 
class MidiDriver;
class MidiParser;
 
namespace Audio {
class SeekableAudioStream;
}
 
namespace Mohawk {
 
#define MAX_CHANNELS 2         // Can there be more than 2?
 
enum SndHandleType {
    kFreeHandle,
    kUsedHandle
};
 
struct SndHandle {
    Audio::SoundHandle handle;
    SndHandleType type;
    uint samplesPerSecond;
    uint16 id;
};
 
struct ADPCMStatus {
    uint32 size;
    uint16 itemCount;
    uint16 channels;
 
    struct StatusItem {
        uint32 sampleFrame;
        struct {
            int16 last;
            uint16 stepIndex;
        } channelStatus[MAX_CHANNELS];
    } *statusItems; 
};
 
struct CueListPoint {
    uint32 sampleFrame;
    Common::String name;
};
 
struct CueList {
    uint32 size;
    uint16 pointCount;
    Common::Array<CueListPoint> points;
};
 
enum {
    kCodecRaw = 0,
    kCodecADPCM = 1,
    kCodecMPEG2 = 2
};
 
struct DataChunk {
    uint16 sampleRate;
    uint32 sampleCount;
    byte bitsPerSample;
    byte channels;
    uint16 encoding;
    uint16 loopCount;
    uint32 loopStart;
    uint32 loopEnd;
    Common::SeekableReadStream *audioData;
};
 
struct MohawkWaveLoopInfo {
    uint32 start = 0;
    uint32 end = 0;
 
    bool isValid() const { return start < end; }
};
 
Audio::SeekableAudioStream *makeMohawkWaveStream(Common::SeekableReadStream *stream, CueList *cueList = nullptr, MohawkWaveLoopInfo *loopInfo = nullptr);
 
class MohawkEngine;
 
class Sound {
public:
    explicit Sound(MohawkEngine *vm);
    ~Sound();
 
    // Generic sound functions
    Audio::SoundHandle *playSound(uint16 id, byte volume = Audio::Mixer::kMaxChannelVolume, bool loop = false, CueList *cueList = NULL);
    void stopSound();
    void stopSound(uint16 id);
    bool isPlaying(uint16 id);
    bool isPlaying();
    uint getNumSamplesPlayed(uint16 id);
 
private:
    MohawkEngine *_vm;
 
    static Audio::SeekableAudioStream *makeLivingBooksWaveStream_v1(Common::SeekableReadStream *stream);
 
    Common::Array<SndHandle> _handles;
    SndHandle *getHandle();
    Audio::SeekableAudioStream *makeAudioStream(uint16 id, CueList *cueList = nullptr,
            MohawkWaveLoopInfo *loopInfo = nullptr);
};
 
} // End of namespace Mohawk
 
#endif