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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2004 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "stdafx.h"
#include "common/util.h"
#include "common/stream.h"
#include "sound/audiostream.h"
#include "sound/mixer.h"
#include "sound/voc.h"
int getSampleRateFromVOCRate(int vocSR) {
if (vocSR == 0xa5 || vocSR == 0xa6) {
return 11025;
} else if (vocSR == 0xd2 || vocSR == 0xd3) {
return 22050;
} else {
int sr = 1000000L / (256L - vocSR);
// inexact sampling rates occur e.g. in the kitchen in Monkey Island,
// very easy to reach right from the start of the game.
//warning("inexact sample rate used: %i (0x%x)", sr, vocSR);
return sr;
}
}
byte *loadVOCFromStream(Common::ReadStream *stream, int &size, int &rate) {
int loops, begin_loop, end_loop;
return loadVOCFromStream(stream, size, rate, loops, begin_loop, end_loop);
}
byte *loadVOCFromStream(Common::ReadStream *stream, int &size, int &rate, int &loops, int &begin_loop, int &end_loop) {
VocFileHeader fileHeader;
if (stream->read(&fileHeader, 8) != 8)
goto invalid;
if (!memcmp(&fileHeader, "VTLK", 4)) {
if (stream->read(&fileHeader, sizeof(VocFileHeader)) != sizeof(VocFileHeader))
goto invalid;
} else if (!memcmp(&fileHeader, "Creative", 8)) {
if (stream->read(((byte *)&fileHeader) + 8, sizeof(VocFileHeader) - 8) != sizeof(VocFileHeader) - 8)
goto invalid;
} else {
invalid:;
warning("loadVOCFromStream: Invalid header");
return NULL;
}
if (memcmp(fileHeader.desc, "Creative Voice File", 19) != 0)
error("loadVOCFromStream: Invalid header");
if (fileHeader.desc[19] != 0x1A)
debug(3, "loadVOCFromStream: Partially invalid header");
int32 offset = FROM_LE_16(fileHeader.datablock_offset);
int16 version = FROM_LE_16(fileHeader.version);
int16 code = FROM_LE_16(fileHeader.id);
assert(offset == sizeof(VocFileHeader));
assert(version == 0x010A || version == 0x0114 || version == 0x0100);
assert(code == ~version + 0x1234);
int len;
byte *ret_sound = 0;
size = 0;
begin_loop = 0;
end_loop = 0;
while ((code = stream->readByte())) {
len = stream->readByte();
len |= stream->readByte() << 8;
len |= stream->readByte() << 16;
switch(code) {
case 1: {
int time_constant = stream->readByte();
int packing = stream->readByte();
len -= 2;
rate = getSampleRateFromVOCRate(time_constant);
debug(9, "VOC Data Block: %d, %d, %d", rate, packing, len);
if (packing == 0) {
if (size) {
ret_sound = (byte *)realloc(ret_sound, size + len);
} else {
ret_sound = (byte *)malloc(len);
}
stream->read(ret_sound + size, len);
size += len;
begin_loop = size;
end_loop = size;
} else {
warning("VOC file packing %d unsupported", packing);
}
} break;
case 6: // begin of loop
assert(len == 2);
loops = stream->readUint16LE();
break;
case 7: // end of loop
assert(len == 0);
break;
default:
warning("Invalid code in VOC file : %d", code);
return ret_sound;
}
}
debug(4, "VOC Data Size : %d", size);
return ret_sound;
}
AudioStream *makeVOCStream(Common::ReadStream *stream) {
int size, rate;
byte *data = loadVOCFromStream(stream, size, rate);
if (!data)
return 0;
return makeLinearInputStream(rate, SoundMixer::FLAG_AUTOFREE | SoundMixer::FLAG_UNSIGNED, data, size, 0, 0);
}
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