/* 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, 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

	/** 
	 * 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,
                                   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,
                                   DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);

} // End of namespace ZVision

#endif