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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/file.h"
#include "sound/audiostream.h"
#include "sound/mixer.h"
#include "sound/voc.h"
int getSampleRateFromVOCRate(int vocSR) {
if (vocSR == 0xa5 || vocSR == 0xa6 || vocSR == 0x83) {
return 11025;
} else if (vocSR == 0xd2 || vocSR == 0xd3) {
return 22050;
} else {
int sr = 1000000L / (256L - vocSR);
warning("inexact sample rate used: %i (0x%x)", sr, vocSR);
return sr;
}
}
byte *readVOCFromMemory(byte *ptr, int &size, int &rate, int &loops, int &begin_loop, int &end_loop) {
assert(memcmp(ptr, "Creative Voice File\x1A", 20) == 0);
int32 offset = READ_LE_UINT16(ptr + 20);
int16 version = READ_LE_UINT16(ptr + 22);
int16 code = READ_LE_UINT16(ptr + 24);
assert(version == 0x010A || version == 0x0114);
assert(code == ~version + 0x1234);
bool quit = false;
byte *ret_sound = 0;
size = 0;
begin_loop = 0;
end_loop = 0;
while (!quit) {
int len = READ_LE_UINT32(ptr + offset);
offset += 4;
code = len & 0xFF;
len >>= 8;
switch(code) {
case 0:
quit = true;
break;
case 1: {
int time_constant = ptr[offset++];
int packing = ptr[offset++];
len -= 2;
rate = getSampleRateFromVOCRate(time_constant);
debug(9, "VOC Data Bloc : %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);
}
memcpy(ret_sound + size, ptr + offset, len);
begin_loop = size;
size += len;
end_loop = size;
} else {
warning("VOC file packing %d unsupported", packing);
}
} break;
case 6: // begin of loop
loops = (uint16)READ_LE_UINT16(ptr + offset);
break;
case 7: // end of loop
break;
default:
warning("Invalid code in VOC file : %d", code);
quit = true;
break;
}
// FIXME some FT samples (ex. 362) has bad length, 2 bytes too short
offset += len;
}
debug(9, "VOC Data Size : %d", size);
return ret_sound;
}
enum {
SOUND_HEADER_SIZE = 26
};
// FIXME/TODO: loadVOCFile() essentially duplicates all the code from
// readCreativeVoc(). Obviously this is bad, it should rather use that function
// (after some tweaks to readCreativeVoc, to deal with the alternate VTLK
// header).
byte *loadVOCFile(File *file, int &size, int &rate) {
char ident[8];
if (file->read(ident, 8) != 8)
goto invalid;
if (!memcmp(ident, "VTLK", 4)) {
file->seek(SOUND_HEADER_SIZE, SEEK_CUR);
} else if (!memcmp(ident, "Creative", 8)) {
file->seek(SOUND_HEADER_SIZE - 8, SEEK_CUR);
} else {
invalid:;
warning("loadVOCFile: invalid header");
return NULL;
}
VocBlockHeader voc_block_hdr;
file->read(&voc_block_hdr, sizeof(voc_block_hdr));
if (voc_block_hdr.blocktype != 1) {
warning("loadVOCFile: Expecting block_type == 1, got %d", voc_block_hdr.blocktype);
return NULL;
}
size = voc_block_hdr.size[0] + (voc_block_hdr.size[1] << 8) + (voc_block_hdr.size[2] << 16) - 2;
rate = getSampleRateFromVOCRate(voc_block_hdr.sr);
int comp = voc_block_hdr.pack;
if (comp != 0) {
warning("loadVOCFile: Unsupported compression type %d", comp);
return NULL;
}
byte *data = (byte *)malloc(size);
if (data == NULL) {
error("loadVOCFile: out of memory");
}
if ((int)file->read(data, size) != size) {
/* no need to free the memory since error will shut down */
error("loadVOCFile: cannot read %d bytes", size);
}
return data;
}
AudioStream *makeVOCStream(byte *ptr) {
int size, rate, loops, begin_loop, end_loop;
byte *data = readVOCFromMemory(ptr, size, rate, loops, begin_loop, end_loop);
if (!data)
return 0;
return makeLinearInputStream(rate, SoundMixer::FLAG_AUTOFREE | SoundMixer::FLAG_UNSIGNED, data, size, 0, 0);
}
AudioStream *makeVOCStream(File *file) {
int size, rate;
byte *data = loadVOCFile(file, size, rate);
if (!data)
return 0;
return makeLinearInputStream(rate, SoundMixer::FLAG_AUTOFREE | SoundMixer::FLAG_UNSIGNED, data, size, 0, 0);
}
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