mirror of
https://github.com/libretro/scummvm.git
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369 lines
9.8 KiB
C++
369 lines
9.8 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2002-2003 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "channel.h"
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#include "chunk.h"
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#include "chunk_type.h"
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ImuseChannel::ImuseChannel(int32 track, int32 freq) :
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_track(track),
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_tbuffer(0),
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_tbufferSize(0),
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_sbuffer(0),
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_sbufferSize(0),
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_frequency(freq),
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_dataSize(-1),
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_inData(false) {
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}
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ImuseChannel::~ImuseChannel() {
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if(_tbuffer) {
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delete []_tbuffer;
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}
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if(_sbuffer) {
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warning("_sbuffer should be 0 !!!");
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delete []_sbuffer;
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}
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}
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bool ImuseChannel::isTerminated() const {
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return (_dataSize <= 0 && _sbuffer == 0);
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}
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bool ImuseChannel::setParameters(int32 nb, int32 size, int32 flags, int32 unk1) {
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// flags: 0 - 8 bits
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// values:
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// 1 - Voice
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// 2 - Background music
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// 0, 3-511 - SFX and volume
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// FIXME: this should be better
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if ((flags != 1) && (flags != 2) && ((flags >> 2) != 0)) {
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_volume = 300 - ((flags >> 3) << 2);
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}
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else {
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_volume = 127;
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}
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return true;
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}
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bool ImuseChannel::checkParameters(int32 index, int32 nbframes, int32 size, int32 track_flags, int32 unk1) {
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return true;
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}
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bool ImuseChannel::appendData(Chunk &b, int32 size) {
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if(_dataSize == -1) {
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assert(size > 8);
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Chunk::type imus_type = b.getDword(); imus_type = SWAP_BYTES(imus_type);
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uint32 imus_size = b.getDword(); imus_size = SWAP_BYTES(imus_size);
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if(imus_type != TYPE_iMUS)
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error("Invalid Chunk for imuse_channel");
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size -= 8;
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_tbufferSize = size;
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assert(_tbufferSize);
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_tbuffer = new byte[_tbufferSize];
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if(!_tbuffer)
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error("imuse_channel failed to allocate memory");
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b.read(_tbuffer, size);
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_dataSize = -2;
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} else {
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if(_tbuffer) {
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byte *old = _tbuffer;
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int32 new_size = size + _tbufferSize;
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_tbuffer = new byte[new_size];
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if(!_tbuffer)
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error("imuse_channel failed to allocate memory");
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memcpy(_tbuffer, old, _tbufferSize);
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delete []old;
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b.read(_tbuffer + _tbufferSize, size);
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_tbufferSize += size;
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} else {
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_tbufferSize = size;
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_tbuffer = new byte[_tbufferSize];
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if(!_tbuffer)
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error("imuse_channel failed to allocate memory");
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b.read(_tbuffer, size);
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}
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}
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return processBuffer();
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}
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bool ImuseChannel::handleFormat(Chunk &src) {
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if(src.getSize() != 20) error("invalid size for FRMT Chunk");
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uint32 imuse_start = src.getDword();
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imuse_start = SWAP_BYTES(imuse_start);
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src.seek(4);
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_bitsize = src.getDword();
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_bitsize = SWAP_BYTES(_bitsize);
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_rate = src.getDword();
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_rate = SWAP_BYTES(_rate);
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_channels = src.getDword();
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_channels = SWAP_BYTES(_channels);
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assert(_channels == 1 || _channels == 2);
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return true;
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}
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bool ImuseChannel::handleText(Chunk &src) {
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return true;
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}
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bool ImuseChannel::handleRegion(Chunk &src) {
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if(src.getSize() != 8)
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error("invalid size for REGN Chunk");
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return true;
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}
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bool ImuseChannel::handleStop(Chunk &src) {
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if(src.getSize() != 4)
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error("invalid size for STOP Chunk");
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return true;
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}
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bool ImuseChannel::handleMap(Chunk &map) {
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while(!map.eof()) {
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Chunk *sub = map.subBlock();
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switch(sub->getType()) {
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case TYPE_FRMT:
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handleFormat(*sub);
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break;
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case TYPE_TEXT:
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handleText(*sub);
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break;
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case TYPE_REGN:
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handleRegion(*sub);
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break;
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case TYPE_STOP:
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handleStop(*sub);
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break;
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default:
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error("Unknown iMUS subChunk found : %s, %d", Chunk::ChunkString(sub->getType()), sub->getSize());
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}
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delete sub;
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}
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return true;
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}
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void ImuseChannel::decode() {
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int remaining_size = _sbufferSize % 3;
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if(remaining_size) {
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_srbufferSize -= remaining_size;
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assert(_inData);
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if(_tbuffer == 0) {
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_tbuffer = new byte[remaining_size];
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memcpy(_tbuffer, _sbuffer + _sbufferSize - remaining_size, remaining_size);
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_tbufferSize = remaining_size;
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_sbufferSize -= remaining_size;
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} else {
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debug(2, "impossible ! : %p, %d, %d, %p(%d), %p(%d, %d)",
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this, _dataSize, _inData, _tbuffer, _tbufferSize, _sbuffer, _sbufferSize, _srbufferSize);
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byte *old = _tbuffer;
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int new_size = remaining_size + _tbufferSize;
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_tbuffer = new byte[new_size];
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if(!_tbuffer) error("imuse_channel failed to allocate memory");
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memcpy(_tbuffer, old, _tbufferSize);
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delete []old;
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memcpy(_tbuffer + _tbufferSize, _sbuffer + _sbufferSize - remaining_size, remaining_size);
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_tbufferSize += remaining_size;
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}
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}
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int loop_size = _sbufferSize / 3;
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int new_size = loop_size * 2;
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byte *keep, *decoded;
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uint32 value;
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keep = decoded = new byte[new_size * 2];
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assert(keep);
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unsigned char * source = _sbuffer;
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while(loop_size--) {
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byte v1 = *source++;
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byte v2 = *source++;
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byte v3 = *source++;
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value = ((((v2 & 0x0f) << 8) | v1) << 4) - 0x8000;
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*decoded++ = (byte)((value >> 8) & 0xff);
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*decoded++ = (byte)(value & 0xff);
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value = ((((v2 & 0xf0) << 4) | v3) << 4) - 0x8000;
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*decoded++ = (byte)((value >> 8) & 0xff);
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*decoded++ = (byte)(value & 0xff);
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}
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delete []_sbuffer;
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_sbuffer = (byte *)keep;
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_sbufferSize = new_size * sizeof(int16);
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}
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bool ImuseChannel::handleSubTags(int32 &offset) {
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if(_tbufferSize - offset >= 8) {
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Chunk::type type = READ_BE_UINT32(_tbuffer + offset);
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uint32 size = READ_BE_UINT32(_tbuffer + offset + 4);
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uint32 available_size = _tbufferSize - offset;
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switch(type) {
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case TYPE_MAP_:
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_inData = false;
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if(available_size >= (size + 8)) {
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ContChunk c((byte *)_tbuffer + offset);
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handleMap(c);
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}
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break;
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case TYPE_DATA:
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_inData = true;
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_dataSize = size;
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offset += 8;
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{
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int reqsize = 1;
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if(_channels == 2)
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reqsize *= 2;
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if(_bitsize == 16)
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reqsize *= 2;
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else if(_bitsize == 12) {
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if(reqsize > 1)
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reqsize = reqsize * 3 / 2;
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else reqsize = 3;
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}
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if((size % reqsize) != 0) {
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debug(2, "Invalid iMUS sound data size : (%d %% %d) != 0, correcting...", size, reqsize);
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size += 3 - (size % reqsize);
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}
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}
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return false;
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default:
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error("unknown Chunk in iMUS track : %s ", Chunk::ChunkString(type));
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}
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offset += size + 8;
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return true;
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}
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return false;
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}
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bool ImuseChannel::processBuffer() {
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assert(_tbuffer != 0);
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assert(_tbufferSize != 0);
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assert(_sbuffer == 0);
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assert(_sbufferSize == 0);
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if(_inData) {
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if(_dataSize < _tbufferSize) {
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int32 offset= _dataSize;
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while(handleSubTags(offset));
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_sbufferSize = _dataSize;
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_sbuffer = _tbuffer;
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if(offset < _tbufferSize) {
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int32 new_size = _tbufferSize - offset;
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_tbuffer = new byte[new_size];
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if(!_tbuffer) error("imuse_channel failed to allocate memory");
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memcpy(_tbuffer, _sbuffer + offset, new_size);
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_tbufferSize = new_size;
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} else {
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_tbuffer = 0;
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_tbufferSize = 0;
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}
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if(_sbufferSize == 0) {
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delete []_sbuffer;
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_sbuffer = 0;
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}
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} else {
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_sbufferSize = _tbufferSize;
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_sbuffer = _tbuffer;
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_tbufferSize = 0;
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_tbuffer = 0;
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}
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} else {
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int32 offset = 0;
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while(handleSubTags(offset));
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if(_inData) {
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_sbufferSize = _tbufferSize - offset;
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assert(_sbufferSize);
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_sbuffer = new byte[_sbufferSize];
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if(!_sbuffer) error("imuse_channel failed to allocate memory");
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memcpy(_sbuffer, _tbuffer + offset, _sbufferSize);
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delete []_tbuffer;
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_tbuffer = 0;
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_tbufferSize = 0;
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} else {
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if(offset) {
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byte * old = _tbuffer;
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int32 new_size = _tbufferSize - offset;
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_tbuffer = new byte[new_size];
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if(!_tbuffer) error("imuse_channel failed to allocate memory");
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memcpy(_tbuffer, old + offset, new_size);
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_tbufferSize = new_size;
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delete []old;
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}
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}
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}
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_srbufferSize = _sbufferSize;
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if(_sbuffer && _bitsize == 12) decode();
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return true;
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}
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int32 ImuseChannel::availableSoundData(void) const {
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int32 ret = _sbufferSize;
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if(_channels == 2) ret /= 2;
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if(_bitsize > 8) ret /= 2;
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return ret;
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}
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void ImuseChannel::getSoundData(int16 *snd, int32 size) {
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if(_dataSize <= 0 || _bitsize <= 8) error("invalid call to imuse_channel::read_sound_data()");
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if(_channels == 2) size *= 2;
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byte * buf = (byte*)snd;
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if(_rate == 11025) {
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for(int32 i = 0; i < size; i++) {
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byte sample1 = *(_sbuffer + i * 2);
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byte sample2 = *(_sbuffer + i * 2 + 1);
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uint16 sample = (uint16)(((int16)((sample1 << 8) | sample2) * _volume) >> 8);
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buf[i * 4 + 0] = (byte)(sample >> 8);
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buf[i * 4 + 1] = (byte)(sample & 0xff);
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buf[i * 4 + 2] = buf[i * 4 + 0];
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buf[i * 4 + 3] = buf[i * 4 + 1];
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}
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} else {
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for(int32 i = 0; i < size; i++){
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byte sample1 = *(_sbuffer + i * 2);
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byte sample2 = *(_sbuffer + i * 2 + 1);
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uint16 sample = (uint16)(((int16)((sample1 << 8) | sample2) * _volume) >> 8);
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buf[i * 2 + 0] = (byte)(sample >> 8);
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buf[i * 2 + 1] = (byte)(sample & 0xff);
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}
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}
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delete []_sbuffer;
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assert(_sbufferSize == 2 * size);
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_sbuffer = 0;
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_sbufferSize = 0;
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_dataSize -= _srbufferSize;
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}
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void ImuseChannel::getSoundData(int8 *snd, int32 size) {
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if(_dataSize <= 0 || _bitsize > 8) error("invalid call to imuse_channel::read_sound_data()");
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if(_channels == 2) size *= 2;
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if(_rate == 11025) {
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for(int32 i = 0; i < size; i++) {
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snd[i * 2] = (int8)(((int8)(_sbuffer[i] ^ 0x80) * _volume) >> 8) ^ 0x80;
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snd[i * 2 + 1] = snd[i * 2];
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}
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} else {
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for(int32 i = 0; i < size; i++){
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snd[i] = (int8)(((int8)(_sbuffer[i] ^ 0x80) * _volume) >> 8) ^ 0x80;
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}
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}
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delete []_sbuffer;
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_sbuffer = 0;
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_sbufferSize = 0;
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_dataSize -= _srbufferSize;
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}
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