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a58b0e9b06
16 bits raw little-endian format used in 4 files in (at least) the GOG version: 1b/00/xarc/00000100.ssn 1b/00/xarc/01000100.ssn 1c/00/xarc/0000000a01.ssn 1c/00/xarc/0100000a01.ssn
144 lines
3.9 KiB
C++
144 lines
3.9 KiB
C++
/* ResidualVM - A 3D game interpreter
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*
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* ResidualVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the AUTHORS
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "engines/stark/formats/iss.h"
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#include "audio/decoders/adpcm_intern.h"
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#include "audio/decoders/raw.h"
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#include "common/substream.h"
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namespace Stark {
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namespace Formats {
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/**
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* ADPCM decoder for the .iss files
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*/
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class ISSADPCMStream : public Audio::Ima_ADPCMStream {
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public:
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ISSADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
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: Ima_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}
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protected:
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int readBuffer(int16 *buffer, const int numSamples) {
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// Similar to MS IMA, but without the four-bytes-per-channel requirement
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int samples;
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assert(numSamples % 2 == 0);
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for (samples = 0; samples < numSamples && !endOfData(); samples += 2) {
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if (_blockPos[0] == _blockAlign) {
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// read block header
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for (byte i = 0; i < _channels; i++) {
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_status.ima_ch[i].last = _stream->readSint16LE();
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_status.ima_ch[i].stepIndex = _stream->readSint16LE();
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}
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_blockPos[0] = 4 * _channels;
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}
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byte data = _stream->readByte();
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buffer[samples + (isStereo() ? 1 : 0)] = decodeIMA(data & 0x0f, isStereo() ? 1 : 0);
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buffer[samples + (isStereo() ? 0 : 1)] = decodeIMA((data >> 4) & 0x0f);
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_blockPos[0]++;
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}
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return samples;
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}
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};
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static Common::String readString(Common::SeekableReadStream *stream) {
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Common::String ret = "";
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byte ch;
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while ((ch = stream->readByte()) != 0x20)
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ret += ch;
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return ret;
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}
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Audio::RewindableAudioStream *makeISSStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse) {
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Common::String codec;
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uint16 blockSize, channels, freq;
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uint32 size;
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byte flags;
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codec = readString(stream);
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if (codec.equals("IMA_ADPCM_Sound")) {
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codec = readString(stream);
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blockSize = (uint16)strtol(codec.c_str(), 0, 10);
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readString(stream);
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// name ?
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readString(stream);
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// ?
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codec = readString(stream);
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channels = (uint16)strtol(codec.c_str(), 0, 10) + 1;
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readString(stream);
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// ?
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codec = readString(stream);
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freq = 44100 / (uint16)strtol(codec.c_str(), 0, 10);
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readString(stream);
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readString(stream);
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codec = readString(stream);
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size = (uint32)strtol(codec.c_str(), 0, 10);
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return new ISSADPCMStream(stream, DisposeAfterUse::YES, size, freq, channels, blockSize);
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} else if (codec.equals("Sound")) {
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readString(stream);
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// name ?
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codec = readString(stream);
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// sample count ?
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codec = readString(stream);
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channels = (uint16)strtol(codec.c_str(), 0, 10) + 1;
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readString(stream);
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// ?
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codec = readString(stream);
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freq = 44100 / (uint16)strtol(codec.c_str(), 0, 10);
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readString(stream);
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readString(stream);
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flags = Audio::FLAG_16BITS | Audio::FLAG_LITTLE_ENDIAN;
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if (channels == 2)
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flags |= Audio::FLAG_STEREO;
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return Audio::makeRawStream(new Common::SeekableSubReadStream(stream, stream->pos(), stream->size(), DisposeAfterUse::YES), freq, flags, DisposeAfterUse::YES);
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} else {
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error("Unknown ISS codec '%s'", codec.c_str());
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}
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}
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} // End of namespace Formats
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} // End of namespace Stark
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