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Diffstat (limited to 'engines/zvision/zork_raw.cpp')
| -rw-r--r-- | engines/zvision/zork_raw.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/engines/zvision/zork_raw.cpp b/engines/zvision/zork_raw.cpp new file mode 100644 index 0000000000..92f659203b --- /dev/null +++ b/engines/zvision/zork_raw.cpp @@ -0,0 +1,191 @@ +/* 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 |