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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/>.
*
*/
/**
* @file
* Sound decoder used in engines:
* - agos
* - chewy (subclass)
* - kyra
* - saga
* - scumm
* - touche
*/
#ifndef AUDIO_VOC_H
#define AUDIO_VOC_H
#include "audio/audiostream.h"
#include "common/list.h"
#include "common/scummsys.h"
#include "common/types.h"
namespace Common {
class ReadStream;
class SeekableReadStream;
}
namespace Audio {
class AudioStream;
class SeekableAudioStream;
#include "common/pack-start.h" // START STRUCT PACKING
struct VocFileHeader {
uint8 desc[20];
uint16 datablock_offset;
uint16 version;
uint16 id;
} PACKED_STRUCT;
struct VocBlockHeader {
uint8 blocktype;
uint8 size[3];
uint8 sr;
uint8 pack;
} PACKED_STRUCT;
#include "common/pack-end.h" // END STRUCT PACKING
class VocStream : public SeekableAudioStream {
public:
VocStream(Common::SeekableReadStream *stream, bool isUnsigned, DisposeAfterUse::Flag disposeAfterUse);
virtual ~VocStream();
int readBuffer(int16 *buffer, const int numSamples) override;
bool isStereo() const override { return false; }
int getRate() const override { return _rate; }
bool endOfData() const override { return (_curBlock == _blocks.end()) && (_blockLeft == 0); }
bool seek(const Timestamp &where) override;
Timestamp getLength() const override { return _length; }
protected:
void preProcess();
Common::SeekableReadStream *const _stream;
const DisposeAfterUse::Flag _disposeAfterUse;
const bool _isUnsigned;
int _rate;
Timestamp _length;
struct Block {
uint8 code;
uint32 length;
union {
struct {
uint32 offset;
int rate;
int samples;
} sampleBlock;
struct {
int count;
} loopBlock;
};
};
typedef Common::List<Block> BlockList;
BlockList _blocks;
BlockList::const_iterator _curBlock;
uint32 _blockLeft;
/**
* Advance one block in the stream in case
* the current one is empty.
*/
void updateBlockIfNeeded();
// Do some internal buffering for systems with really slow slow disk i/o
enum {
/**
* How many samples we can buffer at once.
*
* TODO: Check whether this size suffices
* for systems with slow disk I/O.
*/
kSampleBufferLength = 2048
};
byte _buffer[kSampleBufferLength];
/**
* Fill the temporary sample buffer used in readBuffer.
*
* @param maxSamples Maximum samples to read.
* @return actual count of samples read.
*/
int fillBuffer(int maxSamples);
};
/**
* Take a sample rate parameter as it occurs in a VOC sound header, and
* return the corresponding sample frequency.
*
* This method has special cases for the standard rates of 11025 and 22050 kHz,
* which due to limitations of the format, cannot be encoded exactly in a VOC
* file. As a consequence, many game files have sound data sampled with those
* rates, but the VOC marks them incorrectly as 11111 or 22222 kHz. This code
* works around that and "unrounds" the sampling rates.
*/
extern int getSampleRateFromVOCRate(int vocSR);
/**
* Try to load a VOC from the given seekable stream and create an AudioStream
* from that data. Currently this function only supports uncompressed raw PCM
* data.
*
* This does not use any of the looping features of VOC files!
*/
SeekableAudioStream *makeVOCStream(Common::SeekableReadStream *stream, byte flags, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::NO);
} // End of namespace Audio
#endif
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