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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 SCI_SOUND_DECODERS_SOL_H
#define SCI_SOUND_DECODERS_SOL_H
#include "audio/audiostream.h"
#include "common/stream.h"
namespace Sci {
enum SOLFlags {
kCompressed = 1,
k16Bit = 4,
kStereo = 16
};
template <bool STEREO, bool S16BIT, bool OLDDPCM8>
class SOLStream : public Audio::SeekableAudioStream {
private:
/**
* Read stream containing possibly-compressed SOL audio.
*/
Common::DisposablePtr<Common::SeekableReadStream> _stream;
/**
* Sample rate of audio data.
*/
uint16 _sampleRate;
/**
* The raw (possibly-compressed) size of audio data in the stream.
*/
int32 _rawDataSize;
/**
* DPCM8 pop (overflow) fix working data:
* - Whether or not the fix is enabled, set once on construction.
* - The current state of the repair (0 = inactive, 1 = positive, 2 = negative).
* - The sample state without repair, to detect where repairing should stop.
*/
struct PopFixData {
const bool enabled;
uint8 state;
uint8 preRepairSample;
PopFixData(const bool e):
enabled(e), state(0), preRepairSample(0) {}
} _popfixDPCM8;
/**
* The last sample from the previous DPCM decode.
*/
union {
struct { int16 l; int16 r; } _dpcmCarry16;
struct { uint8 l; uint8 r; } _dpcmCarry8;
};
/**
* The calculated length of the stream.
*/
Audio::Timestamp _length;
bool seek(const Audio::Timestamp &where) override;
Audio::Timestamp getLength() const override;
int readBuffer(int16 *buffer, const int numSamples) override;
bool isStereo() const override;
int getRate() const override;
bool endOfData() const override;
bool rewind() override;
public:
SOLStream(Common::SeekableReadStream *stream, const DisposeAfterUse::Flag disposeAfterUse, const uint16 sampleRate, const int32 rawDataSize);
};
Audio::SeekableAudioStream *makeSOLStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse);
} // End of namespace Sci
#endif // SCI_SOUND_DECODERS_SOL_H
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