mirror of
https://github.com/libretro/scummvm.git
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143 lines
3.7 KiB
C++
143 lines
3.7 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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*
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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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#ifndef ZVISION_ZORK_RAW_H
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#define ZVISION_ZORK_RAW_H
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#include "audio/audiostream.h"
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namespace Common {
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class SeekableReadStream;
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}
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namespace ZVision {
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class ZVision;
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struct SoundParams {
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char identifier;
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uint32 rate;
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bool stereo;
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bool packed;
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bool bits16;
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};
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/**
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* This is a ADPCM stream-reader, this class holds context for multi-chunk reading and no buffers.
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*/
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class RawChunkStream {
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public:
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RawChunkStream(bool stereo);
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~RawChunkStream() {
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}
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private:
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uint _stereo;
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/**
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* Holds the frequency and index from the last sample
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* 0 holds the left channel, 1 holds the right channel
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*/
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struct {
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int32 sample;
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int16 index;
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} _lastSample[2];
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static const int16 _stepAdjustmentTable[8];
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static const int32 _amplitudeLookupTable[89];
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public:
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struct RawChunk {
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int16 *data;
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uint32 size;
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};
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void init();
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//Read next audio portion in new stream (needed for avi), return structure with buffer
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RawChunk readNextChunk(Common::SeekableReadStream *stream);
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//Read numSamples from stream to buffer
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int readBuffer(int16 *buffer, Common::SeekableReadStream *stream, const int numSamples);
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};
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/**
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* This is a stream, which allows for playing raw ADPCM data from a stream.
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*/
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class RawZorkStream : public Audio::RewindableAudioStream {
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public:
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RawZorkStream(uint32 rate, bool stereo, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream);
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~RawZorkStream() {
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}
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public:
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static const SoundParams _zNemSoundParamLookupTable[32];
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static const SoundParams _zgiSoundParamLookupTable[24];
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private:
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const int _rate; // Sample rate of stream
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Audio::Timestamp _playtime; // Calculated total play time
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Common::DisposablePtr<Common::SeekableReadStream> _stream; // Stream to read data from
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bool _endOfData; // Whether the stream end has been reached
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uint _stereo;
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RawChunkStream _streamReader;
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public:
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int readBuffer(int16 *buffer, const int numSamples);
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bool isStereo() const {
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return _stereo;
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}
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bool endOfData() const {
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return _endOfData;
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}
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int getRate() const {
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return _rate;
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}
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Audio::Timestamp getLength() const {
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return _playtime;
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}
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bool rewind();
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};
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/**
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* Creates an audio stream, which plays from the given stream.
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*
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* @param stream Stream object to play from.
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* @param rate Rate of the sound data.
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* @param dispose AfterUse Whether to delete the stream after use.
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* @return The new SeekableAudioStream (or 0 on failure).
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*/
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Audio::RewindableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream,
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int rate,
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bool stereo,
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DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);
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Audio::RewindableAudioStream *makeRawZorkStream(const Common::String &filePath, ZVision *engine);
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} // End of namespace ZVision
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#endif
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