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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/endian.h"
#include "scumm/scumm.h" // For DEBUG_SMUSH
#include "scumm/util.h"
#include "scumm/smush/channel.h"
namespace Scumm {
ImuseChannel::ImuseChannel(int32 track) : SmushChannel(track) {
}
bool ImuseChannel::isTerminated() const {
return (_dataSize <= 0 && _sbuffer == 0);
}
bool ImuseChannel::setParameters(int32 nb, int32 size, int32 flags, int32 unk1, int32) {
if ((flags == 1) || (flags == 2) || (flags == 3)) {
_volume = 127;
} else if ((flags >= 100) && (flags <= 163)) {
_volume = flags * 2 - 200;
} else if ((flags >= 200) && (flags <= 263)) {
_volume = flags * 2 - 400;
} else if ((flags >= 300) && (flags <= 363)) {
_volume = flags * 2 - 600;
} else {
error("ImuseChannel::setParameters(): bad flags: %d", flags);
}
_pan = 0;
return true;
}
bool ImuseChannel::checkParameters(int32 index, int32 nbframes, int32 size, int32 track_flags, int32 unk1) {
return true;
}
bool ImuseChannel::appendData(Common::SeekableReadStream &b, int32 size) {
if (_dataSize == -1) {
assert(size > 8);
uint32 imus_type = b.readUint32BE();
/*uint32 imus_size =*/ b.readUint32BE();
if (imus_type != MKID_BE('iMUS'))
error("Invalid Chunk for imuse_channel");
size -= 8;
_tbufferSize = size;
assert(_tbufferSize);
_tbuffer = new byte[_tbufferSize];
if (!_tbuffer)
error("imuse_channel failed to allocate memory");
b.read(_tbuffer, size);
_dataSize = -2;
} else {
if (_tbuffer) {
byte *old = _tbuffer;
int32 new_size = size + _tbufferSize;
_tbuffer = new byte[new_size];
if (!_tbuffer)
error("imuse_channel failed to allocate memory");
memcpy(_tbuffer, old, _tbufferSize);
delete[] old;
b.read(_tbuffer + _tbufferSize, size);
_tbufferSize += size;
} else {
_tbufferSize = size;
_tbuffer = new byte[_tbufferSize];
if (!_tbuffer)
error("imuse_channel failed to allocate memory");
b.read(_tbuffer, size);
}
}
processBuffer();
_srbufferSize = _sbufferSize;
if (_sbuffer && _bitsize == 12)
decode();
return true;
}
bool ImuseChannel::handleMap(byte *data) {
// Read the chunk size & skip over the chunk header
int32 size = READ_BE_UINT32(data + 4);
data += 8;
while (size > 0) {
uint32 subType = READ_BE_UINT32(data);
int32 subSize = READ_BE_UINT32(data + 4);
data += 8;
size -= 8;
switch (subType) {
case MKID_BE('FRMT'):
if (subSize != 20)
error("invalid size for FRMT Chunk");
//uint32 imuse_start = READ_BE_UINT32(data);
//uint32 unk = READ_BE_UINT32(data+4);
_bitsize = READ_BE_UINT32(data+8);
_rate = READ_BE_UINT32(data+12);
_channels = READ_BE_UINT32(data+16);
assert(_channels == 1 || _channels == 2);
break;
case MKID_BE('TEXT'):
// Ignore this
break;
case MKID_BE('REGN'):
if (subSize != 8)
error("invalid size for REGN Chunk");
break;
case MKID_BE('STOP'):
if (subSize != 4)
error("invalid size for STOP Chunk");
break;
default:
error("Unknown iMUS subChunk found : %s, %d", tag2str(subType), subSize);
}
data += subSize;
size -= subSize;
}
return true;
}
void ImuseChannel::decode() {
int remaining_size = _sbufferSize % 3;
if (remaining_size) {
_srbufferSize -= remaining_size;
assert(_inData);
if (_tbuffer == 0) {
_tbuffer = new byte[remaining_size];
memcpy(_tbuffer, _sbuffer + _sbufferSize - remaining_size, remaining_size);
_tbufferSize = remaining_size;
_sbufferSize -= remaining_size;
} else {
debugC(DEBUG_SMUSH, "impossible ! : %p, %d, %d, %p(%d), %p(%d, %d)",
(const void *)this, _dataSize, _inData, _tbuffer, _tbufferSize, _sbuffer, _sbufferSize, _srbufferSize);
byte *old = _tbuffer;
int new_size = remaining_size + _tbufferSize;
_tbuffer = new byte[new_size];
if (!_tbuffer)
error("imuse_channel failed to allocate memory");
memcpy(_tbuffer, old, _tbufferSize);
delete[] old;
memcpy(_tbuffer + _tbufferSize, _sbuffer + _sbufferSize - remaining_size, remaining_size);
_tbufferSize += remaining_size;
}
}
// FIXME: Code duplication! See decode12BitsSample() in imuse_digi/dimuse_codecs.cpp
int loop_size = _sbufferSize / 3;
int new_size = loop_size * 4;
byte *keep, *decoded;
uint32 value;
keep = decoded = new byte[new_size];
assert(keep);
unsigned char * source = _sbuffer;
while (loop_size--) {
byte v1 = *source++;
byte v2 = *source++;
byte v3 = *source++;
value = ((((v2 & 0x0f) << 8) | v1) << 4) - 0x8000;
WRITE_BE_UINT16(decoded, value); decoded += 2;
value = ((((v2 & 0xf0) << 4) | v3) << 4) - 0x8000;
WRITE_BE_UINT16(decoded, value); decoded += 2;
}
delete[] _sbuffer;
_sbuffer = (byte *)keep;
_sbufferSize = new_size;
}
bool ImuseChannel::handleSubTags(int32 &offset) {
if (_tbufferSize - offset >= 8) {
uint32 type = READ_BE_UINT32(_tbuffer + offset);
uint32 size = READ_BE_UINT32(_tbuffer + offset + 4);
uint32 available_size = _tbufferSize - offset;
switch (type) {
case MKID_BE('MAP '):
_inData = false;
if (available_size >= (size + 8)) {
handleMap((byte *)_tbuffer + offset);
}
break;
case MKID_BE('DATA'):
_inData = true;
_dataSize = size;
offset += 8;
{
int reqsize = 1;
if (_channels == 2)
reqsize *= 2;
if (_bitsize == 16)
reqsize *= 2;
else if (_bitsize == 12) {
if (reqsize > 1)
reqsize = reqsize * 3 / 2;
else reqsize = 3;
}
if ((size % reqsize) != 0) {
debugC(DEBUG_SMUSH, "Invalid iMUS sound data size : (%d %% %d) != 0, correcting...", size, reqsize);
size += 3 - (size % reqsize);
}
}
return false;
default:
error("unknown Chunk in iMUS track : %s ", tag2str(type));
}
offset += size + 8;
return true;
}
return false;
}
byte *ImuseChannel::getSoundData() {
byte *tmp = _sbuffer;
assert(_dataSize > 0);
_dataSize -= _srbufferSize;
_sbuffer = 0;
_sbufferSize = 0;
return tmp;
}
} // End of namespace Scumm
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