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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.
*
*/
// Based on the Xentax Wiki documentation:
// http://wiki.xentax.com/index.php/The_Last_Express_SND
#include "lastexpress/data/snd.h"
#include "lastexpress/debug.h"
#include "audio/decoders/adpcm_intern.h"
#include "audio/audiostream.h"
#include "common/debug.h"
#include "common/memstream.h"
#include "common/system.h"
#include "common/textconsole.h"
namespace LastExpress {
// Last Express ADPCM is similar to MS IMA mono, but inverts its nibbles
// and does not have the 4 byte per channel requirement
class LastExpress_ADPCMStream : public Audio::Ima_ADPCMStream {
public:
LastExpress_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, uint32 blockSize) :
Audio::Ima_ADPCMStream(stream, disposeAfterUse, size, 44100, 1, blockSize) {}
int readBuffer(int16 *buffer, const int numSamples) {
int samples = 0;
assert(numSamples % 2 == 0);
while (samples < numSamples && !_stream->eos() && _stream->pos() < _endpos) {
if (_blockPos[0] == _blockAlign) {
// read block header
_status.ima_ch[0].last = _stream->readSint16LE();
_status.ima_ch[0].stepIndex = _stream->readSint16LE();
_blockPos[0] = 4;
}
for (; samples < numSamples && _blockPos[0] < _blockAlign && !_stream->eos() && _stream->pos() < _endpos; samples += 2) {
byte data = _stream->readByte();
_blockPos[0]++;
buffer[samples] = decodeIMA((data >> 4) & 0x0f);
buffer[samples + 1] = decodeIMA(data & 0x0f);
}
}
return samples;
}
};
//////////////////////////////////////////////////////////////////////////
// Sound
//////////////////////////////////////////////////////////////////////////
SimpleSound::SimpleSound() : _size(0), _blocks(0), _blockSize(0) {}
SimpleSound::~SimpleSound() {
stop();
}
// Stop the sound
void SimpleSound::stop() const {
g_system->getMixer()->stopHandle(_handle);
}
void SimpleSound::loadHeader(Common::SeekableReadStream *in) {
_size = in->readUint32LE();
_blocks = in->readUint16LE();
debugC(5, kLastExpressDebugSound, " sound header data: size=\"%d\", %d blocks", _size, _blocks);
assert (_size % _blocks == 0);
_blockSize = _size / _blocks;
}
Audio::AudioStream *SimpleSound::makeDecoder(Common::SeekableReadStream *in, uint32 size) const {
return new LastExpress_ADPCMStream(in, DisposeAfterUse::YES, size, _blockSize);
}
void SimpleSound::play(Audio::AudioStream *as) {
g_system->getMixer()->playStream(Audio::Mixer::kPlainSoundType, &_handle, as);
}
//////////////////////////////////////////////////////////////////////////
// StreamedSound
//////////////////////////////////////////////////////////////////////////
StreamedSound::StreamedSound() {}
StreamedSound::~StreamedSound() {}
bool StreamedSound::load(Common::SeekableReadStream *stream) {
if (!stream)
return false;
g_system->getMixer()->stopHandle(_handle);
loadHeader(stream);
// Start decoding the input stream
Audio::AudioStream *as = makeDecoder(stream, _size);
// Start playing the decoded audio stream
play(as);
return true;
}
//////////////////////////////////////////////////////////////////////////
// StreamedSound
//////////////////////////////////////////////////////////////////////////
AppendableSound::AppendableSound() : SimpleSound() {
// Create an audio stream where the decoded chunks will be appended
_as = Audio::makeQueuingAudioStream(44100, false);
_finished = false;
// Start playing the decoded audio stream
play(_as);
// Initialize the block size
// TODO: get it as an argument?
_blockSize = 739;
}
AppendableSound::~AppendableSound() {
finish();
_as = NULL;
}
void AppendableSound::queueBuffer(const byte *data, uint32 size) {
Common::MemoryReadStream *buffer = new Common::MemoryReadStream(data, size);
queueBuffer(buffer);
}
void AppendableSound::queueBuffer(Common::SeekableReadStream *bufferIn) {
if (!_as)
error("AppendableSound::queueBuffer - internal error: the audio stream is invalid!");
// Setup the ADPCM decoder
uint32 sizeIn = (uint32)bufferIn->size();
Audio::AudioStream *adpcm = makeDecoder(bufferIn, sizeIn);
// Queue the stream
_as->queueAudioStream(adpcm);
}
void AppendableSound::finish() {
if (!_as)
error("AppendableSound::queueBuffer - internal error: the audio stream is invalid!");
if (!_finished)
_as->finish();
_finished = true;
}
} // End of namespace LastExpress
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