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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 "common/stream.h"
#include "scumm/util.h"
#include "scumm/smush/channel.h"
namespace Scumm {
SaudChannel::SaudChannel(int32 track) : SmushChannel(track),
_nbframes(0),
_markReached(false),
_index(0),
_keepSize(false) {
}
bool SaudChannel::isTerminated() const {
return (_markReached && _dataSize == 0 && _sbuffer == 0);
}
bool SaudChannel::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('STRK'):
_inData = false;
if (available_size >= (size + 8)) {
int32 subSize = READ_BE_UINT32((byte *)_tbuffer + offset + 4);
if (subSize != 14 && subSize != 10) {
error("STRK has an invalid size : %d", subSize);
}
} else
return false;
break;
case MKID_BE('SMRK'):
_inData = false;
if (available_size >= (size + 8))
_markReached = true;
else
return false;
break;
case MKID_BE('SHDR'):
_inData = false;
if (available_size >= (size + 8)) {
int32 subSize = READ_BE_UINT32((byte *)_tbuffer + offset + 4);
if (subSize != 4)
error("SHDR has an invalid size : %d", subSize);
} else
return false;
break;
case MKID_BE('SDAT'):
_inData = true;
_dataSize = size;
offset += 8;
return false;
default:
error("unknown Chunk in SAUD track : %s ", tag2str(type));
}
offset += size + 8;
return true;
}
return false;
}
bool SaudChannel::setParameters(int32 nb, int32 flags, int32 volume, int32 pan, int32 index) {
_nbframes = nb;
_flags = flags; // bit 7 == IS_VOICE, bit 6 == IS_BACKGROUND_MUSIC, other ??
_volume = volume;
_pan = pan;
_index = index;
if (index != 0) {
_dataSize = -2;
_keepSize = true;
_inData = true;
}
return true;
}
bool SaudChannel::checkParameters(int32 index, int32 nb, int32 flags, int32 volume, int32 pan) {
if (++_index != index)
error("invalid index in SaudChannel::checkParameters()");
if (_nbframes != nb)
error("invalid duration in SaudChannel::checkParameters()");
if (_flags != flags)
error("invalid flags in SaudChannel::checkParameters()");
if (_volume != volume || _pan != pan) {
_volume = volume;
_pan = pan;
}
return true;
}
bool SaudChannel::appendData(Common::SeekableReadStream &b, int32 size) {
if (_dataSize == -1) {
assert(size > 8);
uint32 saud_type = b.readUint32BE();
/*uint32 saud_size =*/ b.readUint32BE();
if (saud_type != MKID_BE('SAUD'))
error("Invalid Chunk for SaudChannel : %X", saud_type);
size -= 8;
_dataSize = -2;
}
if (_tbuffer) {
byte *old = _tbuffer;
_tbuffer = new byte[_tbufferSize + size];
if (!_tbuffer)
error("saud_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("saud_channel failed to allocate memory");
b.read(_tbuffer, _tbufferSize);
}
if (_keepSize) {
_sbufferSize = _tbufferSize;
_sbuffer = _tbuffer;
_tbufferSize = 0;
_tbuffer = 0;
} else {
processBuffer();
}
return true;
}
byte *SaudChannel::getSoundData() {
byte *tmp = _sbuffer;
if (!_keepSize) {
assert(_dataSize > 0);
_dataSize -= _sbufferSize;
}
_sbuffer = 0;
_sbufferSize = 0;
return tmp;
}
} // End of namespace Scumm
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