mirror of
https://github.com/libretro/scummvm.git
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131 lines
3.2 KiB
C++
131 lines
3.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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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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* 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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* 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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* $URL$
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* $Id$
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*
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*/
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#include "sound/decoders/iff_sound.h"
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#include "sound/audiostream.h"
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#include "sound/mixer.h"
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#include "sound/decoders/raw.h"
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#include "common/iff_container.h"
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#include "common/func.h"
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namespace Audio {
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struct Voice8Header {
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uint32 oneShotHiSamples;
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uint32 repeatHiSamples;
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uint32 samplesPerHiCycle;
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uint16 samplesPerSec;
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byte octaves;
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byte compression;
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uint32 volume;
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Voice8Header() {
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memset(this, 0, sizeof(Voice8Header));
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}
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void load(Common::ReadStream &stream);
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};
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void Voice8Header::load(Common::ReadStream &stream) {
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oneShotHiSamples = stream.readUint32BE();
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repeatHiSamples = stream.readUint32BE();
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samplesPerHiCycle = stream.readUint32BE();
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samplesPerSec = stream.readUint16BE();
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octaves = stream.readByte();
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compression = stream.readByte();
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volume = stream.readUint32BE();
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}
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struct A8SVXLoader {
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Voice8Header _header;
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int8 *_data;
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uint32 _dataSize;
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void load(Common::ReadStream &input) {
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Common::IFFParser parser(&input);
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Common::Functor1Mem< Common::IFFChunk&, bool, A8SVXLoader > c(this, &A8SVXLoader::callback);
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parser.parse(c);
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}
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bool callback(Common::IFFChunk &chunk) {
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switch (chunk._type) {
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case ID_VHDR:
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_header.load(*chunk._stream);
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break;
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case ID_BODY:
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_dataSize = chunk._size;
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_data = (int8*)malloc(_dataSize);
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assert(_data);
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loadData(chunk._stream);
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return true;
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}
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return false;
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}
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void loadData(Common::ReadStream *stream) {
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switch (_header.compression) {
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case 0:
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stream->read(_data, _dataSize);
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break;
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case 1:
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// implement other formats here
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error("compressed IFF audio is not supported");
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break;
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}
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}
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};
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AudioStream *make8SVXStream(Common::ReadStream &input, bool loop) {
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A8SVXLoader loader;
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loader.load(input);
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SeekableAudioStream *stream = Audio::makeRawStream((byte *)loader._data, loader._dataSize, loader._header.samplesPerSec, 0);
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uint32 loopStart = 0, loopEnd = 0;
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if (loop) {
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// the standard way to loop 8SVX audio implies use of the oneShotHiSamples and
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// repeatHiSamples fields
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loopStart = 0;
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loopEnd = loader._header.oneShotHiSamples + loader._header.repeatHiSamples;
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if (loopStart != loopEnd) {
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return new SubLoopingAudioStream(stream, 0,
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Timestamp(0, loopStart, loader._header.samplesPerSec),
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Timestamp(0, loopEnd, loader._header.samplesPerSec));
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}
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}
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return stream;
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}
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}
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