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87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001-2006 The ScummVM project
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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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#ifndef SOUND_VOC_H
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#define SOUND_VOC_H
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#include "common/stdafx.h"
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#include "common/scummsys.h"
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namespace Common { class ReadStream; }
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namespace Audio {
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class AudioStream;
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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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};
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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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};
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#include "common/pack-end.h" // END STRUCT PACKING
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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. Returns a pointer to memory
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* containing the PCM sample data (allocated with malloc). It is the callers
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* responsibility to dellocate that data again later on! Currently this
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* function only supports uncompressed raw PCM data.
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*/
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extern byte *loadVOCFromStream(Common::ReadStream &stream, int &size, int &rate);
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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. Looping is not supported.
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*
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* This function uses loadVOCFromStream() internally.
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*/
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AudioStream *makeVOCStream(Common::ReadStream &stream);
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} // End of namespace Audio
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#endif
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