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adpcm.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00035 #ifndef AUDIO_ADPCM_H
00036 #define AUDIO_ADPCM_H
00037 
00038 #include "common/scummsys.h"
00039 #include "common/types.h"
00040 
00041 namespace Common {
00042 class SeekableReadStream;
00043 }
00044 
00045 
00046 namespace Audio {
00047 
00048 class PacketizedAudioStream;
00049 class SeekableAudioStream;
00050 
00051 // There are several types of ADPCM encoding, only some are supported here
00052 // For all the different encodings, refer to:
00053 // http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
00054 // Usually, if the audio stream we're trying to play has the FourCC header
00055 // string intact, it's easy to discern which encoding is used
00056 enum ADPCMType {
00057     kADPCMOki,                 // Dialogic/Oki ADPCM (aka VOX)
00058     kADPCMMSIma,               // Microsoft IMA ADPCM
00059     kADPCMMS,                  // Microsoft ADPCM
00060     kADPCMDVI,                 // Intel DVI IMA ADPCM
00061     kADPCMApple,               // Apple QuickTime IMA ADPCM
00062     kADPCMDK3                  // Duck DK3 IMA ADPCM
00063 };
00064 
00078 SeekableAudioStream *makeADPCMStream(
00079     Common::SeekableReadStream *stream,
00080     DisposeAfterUse::Flag disposeAfterUse,
00081     uint32 size, ADPCMType type,
00082     int rate,
00083     int channels,
00084     uint32 blockAlign = 0);
00085 
00100 PacketizedAudioStream *makePacketizedADPCMStream(
00101     ADPCMType type,
00102     int rate,
00103     int channels,
00104     uint32 blockAlign = 0);
00105 
00106 } // End of namespace Audio
00107 
00108 #endif


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