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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.
*
*/
#include "common/scummsys.h"
#include "common/file.h"
#include "common/str.h"
#include "common/stream.h"
#include "common/memstream.h"
#include "common/bufferedstream.h"
#include "common/util.h"
#include "audio/audiostream.h"
#include "audio/decoders/raw.h"
#include "zvision/zork_raw.h"
#include "zvision/zvision.h"
#include "zvision/detection.h"
#include "zvision/utility.h"
namespace ZVision {
const int16 RawZorkStream::_stepAdjustmentTable[8] = {-1, -1, -1, 1, 4, 7, 10, 12};
const int32 RawZorkStream::_amplitudeLookupTable[89] = {0x0007, 0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E,
0x0010, 0x0011, 0x0013, 0x0015, 0x0017, 0x0019, 0x001C, 0x001F,
0x0022, 0x0025, 0x0029, 0x002D, 0x0032, 0x0037, 0x003C, 0x0042,
0x0049, 0x0050, 0x0058, 0x0061, 0x006B, 0x0076, 0x0082, 0x008F,
0x009D, 0x00AD, 0x00BE, 0x00D1, 0x00E6, 0x00FD, 0x0117, 0x0133,
0x0151, 0x0173, 0x0198, 0x01C1, 0x01EE, 0x0220, 0x0256, 0x0292,
0x02D4, 0x031C, 0x036C, 0x03C3, 0x0424, 0x048E, 0x0502, 0x0583,
0x0610, 0x06AB, 0x0756, 0x0812, 0x08E0, 0x09C3, 0x0ABD, 0x0BD0,
0x0CFF, 0x0E4C, 0x0FBA, 0x114C, 0x1307, 0x14EE, 0x1706, 0x1954,
0x1BDC, 0x1EA5, 0x21B6, 0x2515, 0x28CA, 0x2CDF, 0x315B, 0x364B,
0x3BB9, 0x41B2, 0x4844, 0x4F7E, 0x5771, 0x602F, 0x69CE, 0x7462, 0x7FFF};
RawZorkStream::RawZorkStream(uint32 rate, bool stereo, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream)
: _rate(rate),
_stereo(0),
_stream(stream, disposeStream),
_endOfData(false) {
if (stereo)
_stereo = 1;
_lastSample[0].index = 0;
_lastSample[0].sample = 0;
_lastSample[1].index = 0;
_lastSample[1].sample = 0;
// Calculate the total playtime of the stream
if (stereo)
_playtime = Audio::Timestamp(0, _stream->size() / 2, rate);
else
_playtime = Audio::Timestamp(0, _stream->size(), rate);
}
int RawZorkStream::readBuffer(int16 *buffer, const int numSamples) {
int bytesRead = 0;
// 0: Left, 1: Right
uint channel = 0;
while (bytesRead < numSamples) {
byte encodedSample = _stream->readByte();
if (_stream->eos()) {
_endOfData = true;
return bytesRead;
}
bytesRead++;
int16 index = _lastSample[channel].index;
uint32 lookUpSample = _amplitudeLookupTable[index];
int32 sample = 0;
if (encodedSample & 0x40)
sample += lookUpSample;
if (encodedSample & 0x20)
sample += lookUpSample >> 1;
if (encodedSample & 0x10)
sample += lookUpSample >> 2;
if (encodedSample & 8)
sample += lookUpSample >> 3;
if (encodedSample & 4)
sample += lookUpSample >> 4;
if (encodedSample & 2)
sample += lookUpSample >> 5;
if (encodedSample & 1)
sample += lookUpSample >> 6;
if (encodedSample & 0x80)
sample = -sample;
sample += _lastSample[channel].sample;
sample = CLIP(sample, -32768, 32767);
buffer[bytesRead - 1] = (int16)sample;
index += _stepAdjustmentTable[(encodedSample >> 4) & 7];
index = CLIP<int16>(index, 0, 88);
_lastSample[channel].sample = sample;
_lastSample[channel].index = index;
// Increment and wrap the channel
channel = (channel + 1) & _stereo;
}
return bytesRead;
}
bool RawZorkStream::rewind() {
_stream->seek(0, 0);
_stream->clearErr();
_endOfData = false;
_lastSample[0].index = 0;
_lastSample[0].sample = 0;
_lastSample[1].index = 0;
_lastSample[1].sample = 0;
return true;
}
Audio::RewindableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream,
int rate,
bool stereo,
DisposeAfterUse::Flag disposeAfterUse) {
if (stereo)
assert(stream->size() % 2 == 0);
return new RawZorkStream(rate, stereo, disposeAfterUse, stream);
}
Audio::RewindableAudioStream *makeRawZorkStream(const byte *buffer, uint32 size,
int rate,
bool stereo,
DisposeAfterUse::Flag disposeAfterUse) {
return makeRawZorkStream(new Common::MemoryReadStream(buffer, size, disposeAfterUse), rate, stereo, DisposeAfterUse::YES);
}
Audio::RewindableAudioStream *makeRawZorkStream(const Common::String &filePath, ZVision *engine) {
Common::File *file = new Common::File();
assert(file->open(filePath));
Common::String fileName = getFileName(filePath);
fileName.toLowercase();
SoundParams soundParams;
if (engine->getGameId() == ZorkNemesis) {
for (int i = 0; i < 6; i++) {
if (zNemSoundParamLookupTable[i].identifier == (fileName[6]))
soundParams = zNemSoundParamLookupTable[i];
}
}
else if (engine->getGameId() == ZorkGrandInquisitor) {
for (int i = 0; i < 6; i++) {
if (zgiSoundParamLookupTable[i].identifier == (fileName[7]))
soundParams = zgiSoundParamLookupTable[i];
}
}
if (soundParams.packed) {
return makeRawZorkStream(wrapBufferedSeekableReadStream(file, 2048, DisposeAfterUse::YES), soundParams.rate, soundParams.stereo, DisposeAfterUse::YES);
} else {
byte flags = 0;
if (soundParams.stereo)
flags |= Audio::FLAG_STEREO;
return Audio::makeRawStream(file, soundParams.rate, flags, DisposeAfterUse::YES);
}
}
} // End of namespace ZVision
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