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Diffstat (limited to 'engines/sci/sound/decoders/sol.cpp')
| -rw-r--r-- | engines/sci/sound/decoders/sol.cpp | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/engines/sci/sound/decoders/sol.cpp b/engines/sci/sound/decoders/sol.cpp new file mode 100644 index 0000000000..e445403120 --- /dev/null +++ b/engines/sci/sound/decoders/sol.cpp @@ -0,0 +1,273 @@ +/* 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 "audio/audiostream.h" +#include "audio/decoders/raw.h" +#include "common/substream.h" +#include "common/util.h" +#include "engines/sci/sci.h" +#include "engines/sci/sound/decoders/sol.h" + +namespace Sci { + +// Note that the 16-bit version is also used in coktelvideo.cpp +static const uint16 tableDPCM16[128] = { + 0x0000, 0x0008, 0x0010, 0x0020, 0x0030, 0x0040, 0x0050, 0x0060, 0x0070, 0x0080, + 0x0090, 0x00A0, 0x00B0, 0x00C0, 0x00D0, 0x00E0, 0x00F0, 0x0100, 0x0110, 0x0120, + 0x0130, 0x0140, 0x0150, 0x0160, 0x0170, 0x0180, 0x0190, 0x01A0, 0x01B0, 0x01C0, + 0x01D0, 0x01E0, 0x01F0, 0x0200, 0x0208, 0x0210, 0x0218, 0x0220, 0x0228, 0x0230, + 0x0238, 0x0240, 0x0248, 0x0250, 0x0258, 0x0260, 0x0268, 0x0270, 0x0278, 0x0280, + 0x0288, 0x0290, 0x0298, 0x02A0, 0x02A8, 0x02B0, 0x02B8, 0x02C0, 0x02C8, 0x02D0, + 0x02D8, 0x02E0, 0x02E8, 0x02F0, 0x02F8, 0x0300, 0x0308, 0x0310, 0x0318, 0x0320, + 0x0328, 0x0330, 0x0338, 0x0340, 0x0348, 0x0350, 0x0358, 0x0360, 0x0368, 0x0370, + 0x0378, 0x0380, 0x0388, 0x0390, 0x0398, 0x03A0, 0x03A8, 0x03B0, 0x03B8, 0x03C0, + 0x03C8, 0x03D0, 0x03D8, 0x03E0, 0x03E8, 0x03F0, 0x03F8, 0x0400, 0x0440, 0x0480, + 0x04C0, 0x0500, 0x0540, 0x0580, 0x05C0, 0x0600, 0x0640, 0x0680, 0x06C0, 0x0700, + 0x0740, 0x0780, 0x07C0, 0x0800, 0x0900, 0x0A00, 0x0B00, 0x0C00, 0x0D00, 0x0E00, + 0x0F00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000 +}; + +static const byte tableDPCM8[8] = { 0, 1, 2, 3, 6, 10, 15, 21 }; + +/** + * Decompresses 16-bit DPCM compressed audio. Each byte read + * outputs one sample into the decompression buffer. + */ +static void deDPCM16(int16 *out, Common::ReadStream &audioStream, uint32 numBytes, int16 &sample) { + for (uint32 i = 0; i < numBytes; ++i) { + const uint8 delta = audioStream.readByte(); + if (delta & 0x80) { + sample -= tableDPCM16[delta & 0x7f]; + } else { + sample += tableDPCM16[delta]; + } + sample = CLIP<int16>(sample, -32768, 32767); + *out++ = TO_LE_16(sample); + } +} + +/** + * Decompresses one half of an 8-bit DPCM compressed audio + * byte. + */ +static void deDPCM8Nibble(int16 *out, uint8 &sample, uint8 delta) { + const uint8 lastSample = sample; + if (delta & 8) { + sample -= tableDPCM8[delta & 7]; + } else { + sample += tableDPCM8[delta & 7]; + } + sample = CLIP<byte>(sample, 0, 255); + *out = ((lastSample + sample) << 7) ^ 0x8000; +} + +/** + * Decompresses 8-bit DPCM compressed audio. Each byte read + * outputs two samples into the decompression buffer. + */ +static void deDPCM8(int16 *out, Common::ReadStream &audioStream, uint32 numBytes, uint8 &sample) { + for (uint32 i = 0; i < numBytes; ++i) { + const uint8 delta = audioStream.readByte(); + deDPCM8Nibble(out++, sample, delta >> 4); + deDPCM8Nibble(out++, sample, delta & 0xf); + } +} + +# pragma mark - + +template<bool STEREO, bool S16BIT> +SOLStream<STEREO, S16BIT>::SOLStream(Common::SeekableReadStream *stream, const DisposeAfterUse::Flag disposeAfterUse, const int32 dataOffset, const uint16 sampleRate, const int32 rawDataSize) : + _stream(stream, disposeAfterUse), + _dataOffset(dataOffset), + _sampleRate(sampleRate), + // SSCI aligns the size of SOL data to 32 bits + _rawDataSize(rawDataSize & ~3) { + // TODO: This is not valid for stereo SOL files, which + // have interleaved L/R compression so need to store the + // carried values for each channel separately. See + // 60900.aud from Lighthouse for an example stereo file + if (S16BIT) { + _dpcmCarry16 = 0; + } else { + _dpcmCarry8 = 0x80; + } + + const uint8 compressionRatio = 2; + const uint8 numChannels = STEREO ? 2 : 1; + const uint8 bytesPerSample = S16BIT ? 2 : 1; + _length = Audio::Timestamp((_rawDataSize * compressionRatio * 1000) / (_sampleRate * numChannels * bytesPerSample), 60); + } + +template <bool STEREO, bool S16BIT> +bool SOLStream<STEREO, S16BIT>::seek(const Audio::Timestamp &where) { + if (where != 0) { + // In order to seek in compressed SOL files, all + // previous bytes must be known since it uses + // differential compression. Therefore, only seeking + // to the beginning is supported now (SSCI does not + // offer seeking anyway) + return false; + } + + if (S16BIT) { + _dpcmCarry16 = 0; + } else { + _dpcmCarry8 = 0x80; + } + + return _stream->seek(_dataOffset, SEEK_SET); +} + +template <bool STEREO, bool S16BIT> +Audio::Timestamp SOLStream<STEREO, S16BIT>::getLength() const { + return _length; +} + +template <bool STEREO, bool S16BIT> +int SOLStream<STEREO, S16BIT>::readBuffer(int16 *buffer, const int numSamples) { + // Reading an odd number of 8-bit samples will result in a loss of samples + // since one byte represents two samples and we do not store the second + // nibble in this case; it should never happen in reality + assert(S16BIT || (numSamples % 2) == 0); + + const int samplesPerByte = S16BIT ? 1 : 2; + + int32 bytesToRead = numSamples / samplesPerByte; + if (_stream->pos() + bytesToRead > _rawDataSize) { + bytesToRead = _rawDataSize - _stream->pos(); + } + + if (S16BIT) { + deDPCM16(buffer, *_stream, bytesToRead, _dpcmCarry16); + } else { + deDPCM8(buffer, *_stream, bytesToRead, _dpcmCarry8); + } + + const int samplesRead = bytesToRead * samplesPerByte; + return samplesRead; +} + +template <bool STEREO, bool S16BIT> +bool SOLStream<STEREO, S16BIT>::isStereo() const { + return STEREO; +} + +template <bool STEREO, bool S16BIT> +int SOLStream<STEREO, S16BIT>::getRate() const { + return _sampleRate; +} + +template <bool STEREO, bool S16BIT> +bool SOLStream<STEREO, S16BIT>::endOfData() const { + return _stream->eos() || _stream->pos() >= _dataOffset + _rawDataSize; +} + +template <bool STEREO, bool S16BIT> +bool SOLStream<STEREO, S16BIT>::rewind() { + return seek(0); +} + +Audio::SeekableAudioStream *makeSOLStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse) { + + // TODO: Might not be necessary? Makes seeking work, but + // not sure if audio is ever actually seeked in SSCI. + const int32 initialPosition = stream->pos(); + + byte header[6]; + if (stream->read(header, sizeof(header)) != sizeof(header)) { + return nullptr; + } + + if (header[0] != 0x8d || READ_BE_UINT32(header + 2) != MKTAG('S', 'O', 'L', 0)) { + return nullptr; + } + + const uint8 headerSize = header[1]; + const uint16 sampleRate = stream->readUint16LE(); + const byte flags = stream->readByte(); + const uint32 dataSize = stream->readUint32LE(); + + if (flags & kCompressed) { + if (flags & kStereo && flags & k16Bit) { + return new SOLStream<true, true>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), disposeAfterUse, headerSize, sampleRate, dataSize); + } else if (flags & kStereo) { + return new SOLStream<true, false>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), disposeAfterUse, headerSize, sampleRate, dataSize); + } else if (flags & k16Bit) { + return new SOLStream<false, true>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), disposeAfterUse, headerSize, sampleRate, dataSize); + } else { + return new SOLStream<false, false>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), disposeAfterUse, headerSize, sampleRate, dataSize); + } + } + + byte rawFlags = Audio::FLAG_LITTLE_ENDIAN; + if (flags & k16Bit) { + rawFlags |= Audio::FLAG_16BITS; + } else { + rawFlags |= Audio::FLAG_UNSIGNED; + } + + if (flags & kStereo) { + rawFlags |= Audio::FLAG_STEREO; + } + + return Audio::makeRawStream(new Common::SeekableSubReadStream(stream, initialPosition + headerSize, initialPosition + headerSize + dataSize, disposeAfterUse), sampleRate, rawFlags, disposeAfterUse); +} + +// TODO: This needs to be removed when resource manager is fixed +// to not split audio into two parts +Audio::SeekableAudioStream *makeSOLStream(Common::SeekableReadStream *headerStream, Common::SeekableReadStream *dataStream, DisposeAfterUse::Flag disposeAfterUse) { + + if (headerStream->readUint32BE() != MKTAG('S', 'O', 'L', 0)) { + return nullptr; + } + + const uint16 sampleRate = headerStream->readUint16LE(); + const byte flags = headerStream->readByte(); + const int32 dataSize = headerStream->readSint32LE(); + + if (flags & kCompressed) { + if (flags & kStereo && flags & k16Bit) { + return new SOLStream<true, true>(dataStream, disposeAfterUse, 0, sampleRate, dataSize); + } else if (flags & kStereo) { + return new SOLStream<true, false>(dataStream, disposeAfterUse, 0, sampleRate, dataSize); + } else if (flags & k16Bit) { + return new SOLStream<false, true>(dataStream, disposeAfterUse, 0, sampleRate, dataSize); + } else { + return new SOLStream<false, false>(dataStream, disposeAfterUse, 0, sampleRate, dataSize); + } + } + + byte rawFlags = Audio::FLAG_LITTLE_ENDIAN; + if (flags & k16Bit) { + rawFlags |= Audio::FLAG_16BITS; + } else { + rawFlags |= Audio::FLAG_UNSIGNED; + } + + if (flags & kStereo) { + rawFlags |= Audio::FLAG_STEREO; + } + + return Audio::makeRawStream(dataStream, sampleRate, rawFlags, disposeAfterUse); +} + +} |