mirror of
https://github.com/libretro/scummvm.git
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247 lines
7.0 KiB
C++
247 lines
7.0 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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*/
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/**
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* Internal interfaces to the ADPCM decoders.
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*
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* These can be used to make custom ADPCM decoder subclasses,
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* or to at least share some common data tables between various
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* ADPCM decoder implementations.
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*/
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#ifndef AUDIO_ADPCM_INTERN_H
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#define AUDIO_ADPCM_INTERN_H
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#include "audio/audiostream.h"
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#include "common/endian.h"
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#include "common/ptr.h"
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#include "common/stream.h"
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#include "common/textconsole.h"
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namespace Audio {
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class ADPCMStream : public RewindableAudioStream {
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protected:
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Common::DisposablePtr<Common::SeekableReadStream> _stream;
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int32 _startpos;
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const int32 _endpos;
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const int _channels;
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const uint32 _blockAlign;
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uint32 _blockPos[2];
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const int _rate;
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struct ADPCMStatus {
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// OKI/IMA
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struct {
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int32 last;
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int32 stepIndex;
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} ima_ch[2];
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} _status;
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virtual void reset();
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public:
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ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign);
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virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos); }
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virtual bool isStereo() const { return _channels == 2; }
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virtual int getRate() const { return _rate; }
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virtual bool rewind();
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/**
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* This table is used by some ADPCM variants (IMA and OKI) to adjust the
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* step for use on the next sample.
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* The first 8 entries are identical to the second 8 entries. Hence, we
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* could half the table in size. But since the lookup index is always a
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* 4-bit nibble, it is more efficient to just keep it as it is.
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*/
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static const int16 _stepAdjustTable[16];
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};
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class Oki_ADPCMStream : public ADPCMStream {
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public:
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Oki_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
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: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) { _decodedSampleCount = 0; }
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virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos) && (_decodedSampleCount == 0); }
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virtual int readBuffer(int16 *buffer, const int numSamples);
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protected:
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int16 decodeOKI(byte);
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private:
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uint8 _decodedSampleCount;
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int16 _decodedSamples[2];
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};
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class Ima_ADPCMStream : public ADPCMStream {
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protected:
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int16 decodeIMA(byte code, int channel = 0); // Default to using the left channel/using one channel
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public:
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Ima_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
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: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}
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/**
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* This table is used by decodeIMA.
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*/
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static const int16 _imaTable[89];
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};
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class DVI_ADPCMStream : public Ima_ADPCMStream {
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public:
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DVI_ADPCMStream(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) { _decodedSampleCount = 0; }
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virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos) && (_decodedSampleCount == 0); }
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virtual int readBuffer(int16 *buffer, const int numSamples);
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private:
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uint8 _decodedSampleCount;
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int16 _decodedSamples[2];
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};
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class Apple_ADPCMStream : public Ima_ADPCMStream {
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protected:
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// Apple QuickTime IMA ADPCM
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int32 _streamPos[2];
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int16 _buffer[2][2];
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uint8 _chunkPos[2];
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void reset() {
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Ima_ADPCMStream::reset();
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_chunkPos[0] = 0;
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_chunkPos[1] = 0;
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_streamPos[0] = 0;
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_streamPos[1] = _blockAlign;
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}
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public:
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Apple_ADPCMStream(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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_chunkPos[0] = 0;
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_chunkPos[1] = 0;
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_streamPos[0] = 0;
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_streamPos[1] = _blockAlign;
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}
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virtual int readBuffer(int16 *buffer, const int numSamples);
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};
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class MSIma_ADPCMStream : public Ima_ADPCMStream {
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public:
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MSIma_ADPCMStream(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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if (blockAlign == 0)
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error("MSIma_ADPCMStream(): blockAlign isn't specified");
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if (blockAlign % (_channels * 4))
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error("MSIma_ADPCMStream(): invalid blockAlign");
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_samplesLeft[0] = 0;
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_samplesLeft[1] = 0;
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}
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virtual int readBuffer(int16 *buffer, const int numSamples);
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void reset() {
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Ima_ADPCMStream::reset();
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_samplesLeft[0] = 0;
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_samplesLeft[1] = 0;
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}
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private:
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int16 _buffer[2][8];
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int _samplesLeft[2];
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};
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class MS_ADPCMStream : public ADPCMStream {
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protected:
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struct ADPCMChannelStatus {
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byte predictor;
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int16 delta;
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int16 coeff1;
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int16 coeff2;
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int16 sample1;
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int16 sample2;
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};
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struct {
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// MS ADPCM
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ADPCMChannelStatus ch[2];
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} _status;
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void reset() {
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ADPCMStream::reset();
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memset(&_status, 0, sizeof(_status));
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}
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public:
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MS_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
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: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
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if (blockAlign == 0)
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error("MS_ADPCMStream(): blockAlign isn't specified for MS ADPCM");
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memset(&_status, 0, sizeof(_status));
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}
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virtual int readBuffer(int16 *buffer, const int numSamples);
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protected:
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int16 decodeMS(ADPCMChannelStatus *c, byte);
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};
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// Duck DK3 IMA ADPCM Decoder
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// Based on FFmpeg's decoder and http://wiki.multimedia.cx/index.php?title=Duck_DK3_IMA_ADPCM
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class DK3_ADPCMStream : public Ima_ADPCMStream {
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protected:
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void reset() {
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Ima_ADPCMStream::reset();
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_topNibble = false;
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}
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public:
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DK3_ADPCMStream(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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// DK3 only works as a stereo stream
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assert(channels == 2);
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_topNibble = false;
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}
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virtual int readBuffer(int16 *buffer, const int numSamples);
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private:
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byte _nibble, _lastByte;
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bool _topNibble;
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};
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} // End of namespace Audio
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#endif
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