mirror of
https://github.com/libretro/scummvm.git
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173 lines
4.1 KiB
C++
173 lines
4.1 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* @file
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* Sound decoder used in engines:
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* - agos
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* - chewy (subclass)
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* - kyra
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* - saga
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* - scumm
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* - touche
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*/
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#ifndef AUDIO_VOC_H
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#define AUDIO_VOC_H
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#include "audio/audiostream.h"
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#include "common/list.h"
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#include "common/scummsys.h"
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#include "common/types.h"
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namespace Common {
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class ReadStream;
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class SeekableReadStream;
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}
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namespace Audio {
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class AudioStream;
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class SeekableAudioStream;
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#include "common/pack-start.h" // START STRUCT PACKING
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struct VocFileHeader {
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uint8 desc[20];
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uint16 datablock_offset;
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uint16 version;
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uint16 id;
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} PACKED_STRUCT;
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struct VocBlockHeader {
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uint8 blocktype;
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uint8 size[3];
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uint8 sr;
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uint8 pack;
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} PACKED_STRUCT;
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#include "common/pack-end.h" // END STRUCT PACKING
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class VocStream : public SeekableAudioStream {
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public:
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VocStream(Common::SeekableReadStream *stream, bool isUnsigned, DisposeAfterUse::Flag disposeAfterUse);
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virtual ~VocStream();
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int readBuffer(int16 *buffer, const int numSamples) override;
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bool isStereo() const override { return false; }
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int getRate() const override { return _rate; }
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bool endOfData() const override { return (_curBlock == _blocks.end()) && (_blockLeft == 0); }
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bool seek(const Timestamp &where) override;
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Timestamp getLength() const override { return _length; }
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protected:
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void preProcess();
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Common::SeekableReadStream *const _stream;
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const DisposeAfterUse::Flag _disposeAfterUse;
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const bool _isUnsigned;
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int _rate;
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Timestamp _length;
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struct Block {
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uint8 code;
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uint32 length;
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union {
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struct {
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uint32 offset;
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int rate;
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int samples;
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} sampleBlock;
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struct {
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int count;
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} loopBlock;
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};
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};
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typedef Common::List<Block> BlockList;
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BlockList _blocks;
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BlockList::const_iterator _curBlock;
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uint32 _blockLeft;
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/**
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* Advance one block in the stream in case
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* the current one is empty.
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*/
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void updateBlockIfNeeded();
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// Do some internal buffering for systems with really slow slow disk i/o
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enum {
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/**
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* How many samples we can buffer at once.
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*
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* TODO: Check whether this size suffices
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* for systems with slow disk I/O.
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*/
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kSampleBufferLength = 2048
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};
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byte _buffer[kSampleBufferLength];
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/**
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* Fill the temporary sample buffer used in readBuffer.
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*
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* @param maxSamples Maximum samples to read.
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* @return actual count of samples read.
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*/
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int fillBuffer(int maxSamples);
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};
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/**
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* Take a sample rate parameter as it occurs in a VOC sound header, and
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* return the corresponding sample frequency.
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*
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* This method has special cases for the standard rates of 11025 and 22050 kHz,
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* which due to limitations of the format, cannot be encoded exactly in a VOC
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* file. As a consequence, many game files have sound data sampled with those
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* rates, but the VOC marks them incorrectly as 11111 or 22222 kHz. This code
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* works around that and "unrounds" the sampling rates.
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*/
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extern int getSampleRateFromVOCRate(int vocSR);
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/**
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* Try to load a VOC from the given seekable stream and create an AudioStream
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* from that data. Currently this function only supports uncompressed raw PCM
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* data.
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*
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* This does not use any of the looping features of VOC files!
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*/
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SeekableAudioStream *makeVOCStream(Common::SeekableReadStream *stream, byte flags, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::NO);
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} // End of namespace Audio
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#endif
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