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Diffstat (limited to 'audio/decoders/iff_sound.cpp')
-rw-r--r-- | audio/decoders/iff_sound.cpp | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/audio/decoders/iff_sound.cpp b/audio/decoders/iff_sound.cpp new file mode 100644 index 0000000000..2ec189c586 --- /dev/null +++ b/audio/decoders/iff_sound.cpp @@ -0,0 +1,130 @@ +/* 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. + * + * $URL$ + * $Id$ + * + */ + +#include "audio/decoders/iff_sound.h" +#include "audio/audiostream.h" +#include "audio/mixer.h" +#include "audio/decoders/raw.h" +#include "common/iff_container.h" +#include "common/func.h" + +namespace Audio { + +struct Voice8Header { + uint32 oneShotHiSamples; + uint32 repeatHiSamples; + uint32 samplesPerHiCycle; + uint16 samplesPerSec; + byte octaves; + byte compression; + uint32 volume; + + Voice8Header() { + memset(this, 0, sizeof(Voice8Header)); + } + + void load(Common::ReadStream &stream); +}; + +void Voice8Header::load(Common::ReadStream &stream) { + oneShotHiSamples = stream.readUint32BE(); + repeatHiSamples = stream.readUint32BE(); + samplesPerHiCycle = stream.readUint32BE(); + samplesPerSec = stream.readUint16BE(); + octaves = stream.readByte(); + compression = stream.readByte(); + volume = stream.readUint32BE(); +} + + + +struct A8SVXLoader { + Voice8Header _header; + int8 *_data; + uint32 _dataSize; + + void load(Common::ReadStream &input) { + Common::IFFParser parser(&input); + Common::Functor1Mem< Common::IFFChunk&, bool, A8SVXLoader > c(this, &A8SVXLoader::callback); + parser.parse(c); + } + + bool callback(Common::IFFChunk &chunk) { + switch (chunk._type) { + case ID_VHDR: + _header.load(*chunk._stream); + break; + + case ID_BODY: + _dataSize = chunk._size; + _data = (int8*)malloc(_dataSize); + assert(_data); + loadData(chunk._stream); + return true; + } + + return false; + } + + void loadData(Common::ReadStream *stream) { + switch (_header.compression) { + case 0: + stream->read(_data, _dataSize); + break; + + case 1: + // implement other formats here + error("compressed IFF audio is not supported"); + break; + } + + } +}; + + +AudioStream *make8SVXStream(Common::ReadStream &input, bool loop) { + A8SVXLoader loader; + loader.load(input); + + SeekableAudioStream *stream = Audio::makeRawStream((byte *)loader._data, loader._dataSize, loader._header.samplesPerSec, 0); + + uint32 loopStart = 0, loopEnd = 0; + if (loop) { + // the standard way to loop 8SVX audio implies use of the oneShotHiSamples and + // repeatHiSamples fields + loopStart = 0; + loopEnd = loader._header.oneShotHiSamples + loader._header.repeatHiSamples; + + if (loopStart != loopEnd) { + return new SubLoopingAudioStream(stream, 0, + Timestamp(0, loopStart, loader._header.samplesPerSec), + Timestamp(0, loopEnd, loader._header.samplesPerSec)); + } + } + + return stream; +} + +} |