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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2005 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 "common/stdafx.h"
#include "scumm/smush/channel.h"
#include "scumm/smush/chunk.h"
#include "scumm/smush/chunk_type.h"
namespace Scumm {
void SaudChannel::handleStrk(Chunk &b) {
int32 size = b.getSize();
if (size != 14 && size != 10) {
error("STRK has an invalid size : %d", size);
}
}
void SaudChannel::handleSmrk(Chunk &b) {
_markReached = true;
}
void SaudChannel::handleShdr(Chunk &b) {
int32 size = b.getSize();
if (size != 4)
error("SHDR has an invalid size : %d", size);
}
bool SaudChannel::handleSubTags(int32 &offset) {
if (_tbufferSize - offset >= 8) {
Chunk::type type = READ_BE_UINT32(_tbuffer + offset);
uint32 size = READ_BE_UINT32(_tbuffer + offset + 4);
uint32 available_size = _tbufferSize - offset;
switch(type) {
case TYPE_STRK:
_inData = false;
if (available_size >= (size + 8)) {
MemoryChunk c((byte *)_tbuffer + offset);
handleStrk(c);
} else
return false;
break;
case TYPE_SMRK:
_inData = false;
if (available_size >= (size + 8)) {
MemoryChunk c((byte *)_tbuffer + offset);
handleSmrk(c);
} else
return false;
break;
case TYPE_SHDR:
_inData = false;
if (available_size >= (size + 8)) {
MemoryChunk c((byte *)_tbuffer + offset);
handleShdr(c);
} else
return false;
break;
case TYPE_SDAT:
_inData = true;
_dataSize = size;
offset += 8;
return false;
default:
error("unknown Chunk in SAUD track : %s ", Chunk::ChunkString(type));
}
offset += size + 8;
return true;
}
return false;
}
bool SaudChannel::processBuffer() {
assert(_tbuffer != 0);
assert(_tbufferSize != 0);
assert(_sbuffer == 0);
assert(_sbufferSize == 0);
if (_keepSize) {
_sbufferSize = _tbufferSize;
_sbuffer = _tbuffer;
_tbufferSize = 0;
_tbuffer = 0;
} else if (_inData) {
if (_dataSize < _tbufferSize) {
int32 offset = _dataSize;
while (handleSubTags(offset)) ;
_sbufferSize = _dataSize;
_sbuffer = _tbuffer;
if (offset < _tbufferSize) {
int new_size = _tbufferSize - offset;
_tbuffer = new byte[new_size];
if (!_tbuffer)
error("SaudChannel failed to allocate memory");
memcpy(_tbuffer, _sbuffer + offset, new_size);
_tbufferSize = new_size;
} else {
_tbuffer = 0;
_tbufferSize = 0;
}
if (_sbufferSize == 0) {
delete []_sbuffer;
_sbuffer = 0;
}
} else {
_sbufferSize = _tbufferSize;
_sbuffer = _tbuffer;
_tbufferSize = 0;
_tbuffer = 0;
}
} else {
int32 offset = 0;
while (handleSubTags(offset));
if (_inData) {
_sbufferSize = _tbufferSize - offset;
assert(_sbufferSize);
_sbuffer = new byte[_sbufferSize];
if (!_sbuffer)
error("saud_channel failed to allocate memory");
memcpy(_sbuffer, _tbuffer + offset, _sbufferSize);
delete []_tbuffer;
_tbuffer = 0;
_tbufferSize = 0;
} else {
if (offset) {
byte *old = _tbuffer;
int32 new_size = _tbufferSize - offset;
_tbuffer = new byte[new_size];
if (!_tbuffer)
error("SaudChannel failed to allocate memory");
memcpy(_tbuffer, old + offset, new_size);
_tbufferSize = new_size;
delete []old;
}
}
}
return true;
}
SaudChannel::SaudChannel(int32 track, int32 freq) :
_track(track),
_nbframes(0),
_dataSize(-1),
_frequency(freq),
_inData(false),
_markReached(false),
_index(0),
_tbuffer(0),
_tbufferSize(0),
_sbuffer(0),
_sbufferSize(0),
_keepSize(false) {
}
SaudChannel::~SaudChannel() {
_dataSize = 0;
_tbufferSize = 0;
_sbufferSize = 0;
_markReached = true;
if (_tbuffer)
delete []_tbuffer;
if (_sbuffer) {
// _sbuffer can be not empty here with insane when it seeks in video
delete []_sbuffer;
}
_sbuffer = 0;
}
bool SaudChannel::isTerminated() const {
return (_markReached && _dataSize == 0 && _sbuffer == 0);
}
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(Chunk &b, int32 size) {
if (_dataSize == -1) {
assert(size > 8);
Chunk::type saud_type = b.getDword();
saud_type = SWAP_BYTES_32(saud_type);
uint32 saud_size = b.getDword();
saud_size = SWAP_BYTES_32(saud_size);
if (saud_type != TYPE_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);
}
return processBuffer();
}
int32 SaudChannel::availableSoundData(void) const {
return _sbufferSize;
}
void SaudChannel::getSoundData(int16 *snd, int32 size) {
for (int32 i = 0; i < size; i++) {
snd[2 * i] = TO_LE_16(_sbuffer[i] ^ 0x80);
snd[2 * i + 1] = TO_LE_16(_sbuffer[i] ^ 0x80);
}
if (!_keepSize)
_dataSize -= size;
delete []_sbuffer;
_sbuffer = 0;
_sbufferSize = 0;
}
} // End of namespace Scumm
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