mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-28 04:34:50 +00:00
390 lines
8.9 KiB
C++
390 lines
8.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "kyra/sound.h"
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#include "sound/audiostream.h"
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namespace Kyra {
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// Thanks to Torbjorn Andersson (eriktorbjorn) for his aud player on which
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// this code is based on
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// TODO: cleanup of whole AUDStream
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class AUDStream : public Audio::AudioStream {
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public:
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AUDStream(Common::File *file, bool loop = false);
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~AUDStream();
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int readBuffer(int16 *buffer, const int numSamples);
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bool isStereo() const { return false; }
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bool endOfData() const { return _endOfData; }
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int getRate() const { return _rate; }
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void beginFadeIn();
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void beginFadeOut();
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private:
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Common::File *_file;
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bool _loop;
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uint32 _loopStart;
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bool _endOfData;
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int _rate;
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uint _processedSize;
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uint _totalSize;
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int _bytesLeft;
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byte *_outBuffer;
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int _outBufferOffset;
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uint _outBufferSize;
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byte *_inBuffer;
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uint _inBufferSize;
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int32 _fadeSamples;
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int32 _fadeCount;
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int _fading;
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int readChunk(int16 *buffer, const int maxSamples);
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static const int8 WSTable2Bit[];
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static const int8 WSTable4Bit[];
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};
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const int8 AUDStream::WSTable2Bit[] = { -2, -1, 0, 1 };
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const int8 AUDStream::WSTable4Bit[] = {
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-9, -8, -6, -5, -4, -3, -2, -1,
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0, 1, 2, 3, 4, 5, 6, 8
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};
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AUDStream::AUDStream(Common::File *file, bool loop) : _file(file), _endOfData(true), _rate(0),
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_processedSize(0), _totalSize(0), _bytesLeft(0), _outBuffer(0),
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_outBufferOffset(0), _outBufferSize(0), _inBuffer(0), _inBufferSize(0) {
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_rate = _file->readUint16LE();
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_totalSize = _file->readUint32LE();
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_loop = loop;
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// TODO: Find the correct number of samples for a fade-in/out. Should
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// probably take the same amount of time as a palette fade.
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_fadeSamples = 2 * getRate();
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_fading = 0;
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// TODO?: add checks
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int flags = _file->readByte(); // flags
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int type = _file->readByte(); // type
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_loopStart = file->pos();
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if (type == 1 && !flags) {
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_endOfData = false;
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} else
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warning("No AUD file (rate: %d, size: %d, flags: 0x%X, type: %d)", _rate, _totalSize, flags, type);
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}
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AUDStream::~AUDStream() {
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delete [] _outBuffer;
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delete [] _inBuffer;
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delete _file;
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}
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void AUDStream::beginFadeIn() {
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if (_fading == 0)
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_fadeCount = 0;
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_fading = 1;
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}
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void AUDStream::beginFadeOut() {
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if (_fading == 0)
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_fadeCount = _fadeSamples;
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_fading = -1;
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}
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int AUDStream::readBuffer(int16 *buffer, const int numSamples) {
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int samplesRead = 0, samplesLeft = numSamples;
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while (samplesLeft > 0 && !_endOfData) {
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int samples = readChunk(buffer, samplesLeft);
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samplesRead += samples;
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samplesLeft -= samples;
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buffer += samples;
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}
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return samplesRead;
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}
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inline int16 clip8BitSample(int16 sample) {
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if (sample > 255)
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return 255;
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if (sample < 0)
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return 0;
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return sample;
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}
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int AUDStream::readChunk(int16 *buffer, const int maxSamples) {
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int samplesProcessed = 0;
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// if no bytes of the old chunk are left, read the next one
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if (_bytesLeft <= 0) {
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if (_processedSize >= _totalSize) {
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if (_loop) {
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_file->seek(_loopStart);
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_processedSize = 0;
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} else {
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_endOfData = true;
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return 0;
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}
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}
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uint16 size = _file->readUint16LE();
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uint16 outSize = _file->readUint16LE();
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uint32 id = _file->readUint32LE();
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assert(id == 0x0000DEAF);
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_processedSize += 8 + size;
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_outBufferOffset = 0;
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if (size == outSize) {
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if (outSize > _outBufferSize) {
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_outBufferSize = outSize;
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delete [] _outBuffer;
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_outBuffer = new uint8[_outBufferSize];
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assert(_outBuffer);
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}
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_bytesLeft = size;
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_file->read(_outBuffer, _bytesLeft);
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} else {
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_bytesLeft = outSize;
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if (outSize > _outBufferSize) {
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_outBufferSize = outSize;
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delete [] _outBuffer;
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_outBuffer = new uint8[_outBufferSize];
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assert(_outBuffer);
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}
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if (size > _inBufferSize) {
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_inBufferSize = size;
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delete [] _inBuffer;
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_inBuffer = new uint8[_inBufferSize];
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assert(_inBuffer);
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}
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if (_file->read(_inBuffer, size) != size) {
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_endOfData = true;
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return 0;
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}
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int16 curSample = 0x80;
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byte code = 0;
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int8 count = 0;
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uint16 input = 0;
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int j = 0;
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int i = 0;
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while (outSize > 0) {
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input = _inBuffer[i++] << 2;
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code = (input >> 8) & 0xff;
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count = (input & 0xff) >> 2;
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switch (code) {
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case 2:
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if (count & 0x20) {
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/* NOTE: count is signed! */
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count <<= 3;
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curSample += (count >> 3);
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_outBuffer[j++] = curSample & 0xFF;
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outSize--;
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} else {
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for (; count >= 0; count--) {
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_outBuffer[j++] = _inBuffer[i++];
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outSize--;
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}
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curSample = _inBuffer[i - 1];
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}
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break;
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case 1:
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for (; count >= 0; count--) {
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code = _inBuffer[i++];
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curSample += WSTable4Bit[code & 0x0f];
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curSample = clip8BitSample(curSample);
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_outBuffer[j++] = curSample;
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curSample += WSTable4Bit[code >> 4];
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curSample = clip8BitSample(curSample);
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_outBuffer[j++] = curSample;
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outSize -= 2;
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}
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break;
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case 0:
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for (; count >= 0; count--) {
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code = (uint8)_inBuffer[i++];
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curSample += WSTable2Bit[code & 0x03];
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curSample = clip8BitSample(curSample);
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_outBuffer[j++] = curSample & 0xFF;
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curSample += WSTable2Bit[(code >> 2) & 0x03];
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curSample = clip8BitSample(curSample);
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_outBuffer[j++] = curSample & 0xFF;
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curSample += WSTable2Bit[(code >> 4) & 0x03];
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curSample = clip8BitSample(curSample);
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_outBuffer[j++] = curSample & 0xFF;
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curSample += WSTable2Bit[(code >> 6) & 0x03];
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curSample = clip8BitSample(curSample);
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_outBuffer[j++] = curSample & 0xFF;
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outSize -= 4;
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}
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break;
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default:
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for (; count >= 0; count--) {
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_outBuffer[j++] = curSample & 0xFF;
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outSize--;
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}
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}
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}
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}
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}
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// copies the chunk data to the output buffer
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if (_bytesLeft > 0) {
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int samples = MIN(_bytesLeft, maxSamples);
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samplesProcessed += samples;
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_bytesLeft -= samples;
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// To help avoid overflows for long fade times, we divide both
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// _fadeSamples and _fadeCount when calculating the new sample.
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int32 div = _fadeSamples / 256;
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while (samples--) {
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int16 sample = (_outBuffer[_outBufferOffset++] << 8) ^ 0x8000;
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if (_fading) {
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sample = (sample * (_fadeCount / 256)) / div;
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_fadeCount += _fading;
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if (_fadeCount < 0) {
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_fadeCount = 0;
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_endOfData = true;
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} else if (_fadeCount > _fadeSamples) {
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_fadeCount = _fadeSamples;
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_fading = 0;
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}
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}
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*buffer++ = sample;
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}
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}
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if (_fading < 0 && _fadeCount == 0)
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_fading = false;
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return samplesProcessed;
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}
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#pragma mark -
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SoundDigital::SoundDigital(KyraEngine *vm, Audio::Mixer *mixer) : _vm(vm), _mixer(mixer), _sounds() {
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memset(_sounds, 0, sizeof(_sounds));
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}
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SoundDigital::~SoundDigital() {
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for (int i = 0; i < SOUND_STREAMS; ++i)
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stopSound(i);
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}
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int SoundDigital::playSound(Common::File *fileHandle, bool loop, bool fadeIn, int channel) {
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Sound *use = 0;
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if (channel != -1 && channel < SOUND_STREAMS) {
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stopSound(channel);
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use = &_sounds[channel];
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} else {
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for (channel = 0; channel < SOUND_STREAMS; ++channel) {
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if (!_sounds[channel].stream) {
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use = &_sounds[channel];
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break;
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}
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}
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if (!use) {
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warning("no free sound channel");
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delete fileHandle;
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return -1;
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}
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}
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use->stream = new AUDStream(fileHandle, loop);
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if (use->stream->endOfData()) {
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delete use->stream;
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use->stream = 0;
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return -1;
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}
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if (fadeIn)
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use->stream->beginFadeIn();
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// TODO: set correct sound type from channel id
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_mixer->playInputStream(Audio::Mixer::kPlainSoundType, &use->handle, use->stream);
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return use - _sounds;
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}
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bool SoundDigital::isPlaying(int channel) {
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if (channel == -1)
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return false;
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assert(channel >= 0 && channel < SOUND_STREAMS);
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return _mixer->isSoundHandleActive(_sounds[channel].handle);
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}
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void SoundDigital::stopSound(int channel) {
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assert(channel >= 0 && channel < SOUND_STREAMS);
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_mixer->stopHandle(_sounds[channel].handle);
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_sounds[channel].stream = 0;
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}
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void SoundDigital::beginFadeOut(int channel) {
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if (isPlaying(channel))
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_sounds[channel].stream->beginFadeOut();
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}
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} // end of namespace Kyra
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