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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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef ZVISION_ZORK_RAW_H
#define ZVISION_ZORK_RAW_H
#include "common/types.h"
#include "audio/audiostream.h"
namespace Common {
class SeekableReadStream;
}
namespace ZVision {
/**
* This is a stream, which allows for playing raw ADPCM data from a stream.
*/
class RawZorkStream : public Audio::RewindableAudioStream {
public:
RawZorkStream(uint32 rate, bool stereo, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream);
~RawZorkStream() {
}
private:
const int _rate; // Sample rate of stream
Audio::Timestamp _playtime; // Calculated total play time
Common::DisposablePtr<Common::SeekableReadStream> _stream; // Stream to read data from
bool _endOfData; // Whether the stream end has been reached
bool _stereo;
/**
* Holds the frequency and index from the last sample
* 0 holds the left channel, 1 holds the right channel
*/
struct {
int32 sample;
int16 index;
} _lastSample[2];
static const int16 stepAdjustmentTable[8];
static const int32 amplitudeLookupTable[89];
public:
int readBuffer(int16 *buffer, const int numSamples);
bool isStereo() const { return true; }
bool endOfData() const { return _endOfData; }
int getRate() const { return _rate; }
Audio::Timestamp getLength() const { return _playtime; }
bool rewind();
private:
/**
* Fill the temporary sample buffer used in readBuffer.
*
* @param maxSamples Maximum samples to read.
* @return actual count of samples read.
*/
int fillBuffer(int maxSamples);
uint32 processBlock();
};
/**
* Creates an audio stream, which plays from the given buffer.
*
* @param buffer Buffer to play from.
* @param size Size of the buffer in bytes.
* @param rate Rate of the sound data.
* @param disposeAfterUse Whether to free the buffer after use (with free!).
* @return The new SeekableAudioStream (or 0 on failure).
*/
Audio::RewindableAudioStream *makeRawZorkStream(const byte *buffer, uint32 size,
int rate,
bool stereo,
DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);
/**
* Creates an audio stream, which plays from the given stream.
*
* @param stream Stream object to play from.
* @param rate Rate of the sound data.
* @param disposeAfterUse Whether to delete the stream after use.
* @return The new SeekableAudioStream (or 0 on failure).
*/
Audio::RewindableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream,
int rate,
bool stereo,
DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);
} // End of namespace ZVision
#endif
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