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-rw-r--r--engines/kyra/sound/drivers/audstream.cpp320
1 files changed, 320 insertions, 0 deletions
diff --git a/engines/kyra/sound/drivers/audstream.cpp b/engines/kyra/sound/drivers/audstream.cpp
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+++ b/engines/kyra/sound/drivers/audstream.cpp
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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.
+ *
+ */
+
+#include "kyra/resource/resource.h"
+#include "audio/audiostream.h"
+
+#include "common/util.h"
+
+namespace Kyra {
+
+// Thanks to Torbjorn Andersson (eriktorbjorn) for his aud player on which
+// this code is based on
+
+// TODO: cleanup of whole AUDStream
+
+class AUDStream : public Audio::SeekableAudioStream {
+public:
+ AUDStream(Common::SeekableReadStream* stream);
+ ~AUDStream();
+
+ int readBuffer(int16* buffer, const int numSamples);
+
+ bool isStereo() const { return false; }
+ bool endOfData() const { return _endOfData; }
+
+ int getRate() const { return _rate; }
+
+ bool seek(const Audio::Timestamp& where);
+ Audio::Timestamp getLength() const { return _length; }
+private:
+ Common::SeekableReadStream* _stream;
+ uint32 _streamStart;
+ bool _endOfData;
+ int _rate;
+ uint _processedSize;
+ uint _totalSize;
+ Audio::Timestamp _length;
+
+ int _bytesLeft;
+
+ byte* _outBuffer;
+ int _outBufferOffset;
+ uint _outBufferSize;
+
+ byte* _inBuffer;
+ uint _inBufferSize;
+
+ int readChunk(int16* buffer, const int maxSamples);
+
+ static const int8 WSTable2Bit[];
+ static const int8 WSTable4Bit[];
+};
+
+const int8 AUDStream::WSTable2Bit[] = { -2, -1, 0, 1 };
+const int8 AUDStream::WSTable4Bit[] = {
+ -9, -8, -6, -5, -4, -3, -2, -1,
+ 0, 1, 2, 3, 4, 5, 6, 8
+};
+
+AUDStream::AUDStream(Common::SeekableReadStream *stream) : _stream(stream), _endOfData(true), _rate(0),
+ _processedSize(0), _totalSize(0), _length(0, 1), _bytesLeft(0), _outBuffer(0),
+ _outBufferOffset(0), _outBufferSize(0), _inBuffer(0), _inBufferSize(0) {
+
+ _rate = _stream->readUint16LE();
+ _totalSize = _stream->readUint32LE();
+
+ // TODO?: add checks
+ int flags = _stream->readByte(); // flags
+ int type = _stream->readByte(); // type
+
+ _streamStart = stream->pos();
+
+ debugC(5, kDebugLevelSound, "AUD Info: rate: %d, totalSize: %d, flags: %d, type: %d, streamStart: %d", _rate, _totalSize, flags, type, _streamStart);
+
+ _length = Audio::Timestamp(0, _rate);
+ for (uint32 i = 0; i < _totalSize;) {
+ uint16 size = _stream->readUint16LE();
+ uint16 outSize = _stream->readUint16LE();
+
+ _length = _length.addFrames(outSize);
+ stream->seek(size + 4, SEEK_CUR);
+ i += size + 8;
+ }
+
+ stream->seek(_streamStart, SEEK_SET);
+
+ if (type == 1 && !flags)
+ _endOfData = false;
+ else
+ warning("No AUD file (rate: %d, size: %d, flags: 0x%X, type: %d)", _rate, _totalSize, flags, type);
+}
+
+AUDStream::~AUDStream() {
+ delete[] _outBuffer;
+ delete[] _inBuffer;
+ delete _stream;
+}
+
+int AUDStream::readBuffer(int16 *buffer, const int numSamples) {
+ int samplesRead = 0, samplesLeft = numSamples;
+
+ while (samplesLeft > 0 && !_endOfData) {
+ int samples = readChunk(buffer, samplesLeft);
+ samplesRead += samples;
+ samplesLeft -= samples;
+ buffer += samples;
+ }
+
+ return samplesRead;
+}
+
+inline int16 clip8BitSample(int16 sample) {
+ return CLIP<int16>(sample, 0, 255);
+}
+
+int AUDStream::readChunk(int16 *buffer, const int maxSamples) {
+ int samplesProcessed = 0;
+
+ // if no bytes of the old chunk are left, read the next one
+ if (_bytesLeft <= 0) {
+ if (_processedSize >= _totalSize) {
+ _endOfData = true;
+ return 0;
+ }
+
+ uint16 size = _stream->readUint16LE();
+ uint16 outSize = _stream->readUint16LE();
+ uint32 id = _stream->readUint32LE();
+
+ assert(id == 0x0000DEAF);
+
+ _processedSize += 8 + size;
+
+ _outBufferOffset = 0;
+ if (size == outSize) {
+ if (outSize > _outBufferSize) {
+ _outBufferSize = outSize;
+ delete[] _outBuffer;
+ _outBuffer = new uint8[_outBufferSize];
+ assert(_outBuffer);
+ }
+
+ _bytesLeft = size;
+
+ _stream->read(_outBuffer, _bytesLeft);
+ } else {
+ _bytesLeft = outSize;
+
+ if (outSize > _outBufferSize) {
+ _outBufferSize = outSize;
+ delete[] _outBuffer;
+ _outBuffer = new uint8[_outBufferSize];
+ assert(_outBuffer);
+ }
+
+ if (size > _inBufferSize) {
+ _inBufferSize = size;
+ delete[] _inBuffer;
+ _inBuffer = new uint8[_inBufferSize];
+ assert(_inBuffer);
+ }
+
+ if (_stream->read(_inBuffer, size) != size) {
+ _endOfData = true;
+ return 0;
+ }
+
+ int16 curSample = 0x80;
+ byte code = 0;
+ int8 count = 0;
+ uint16 input = 0;
+ int j = 0;
+ int i = 0;
+
+ while (outSize > 0) {
+ input = _inBuffer[i++] << 2;
+ code = (input >> 8) & 0xFF;
+ count = (input & 0xFF) >> 2;
+
+ switch (code) {
+ case 2:
+ if (count & 0x20) {
+ /* NOTE: count is signed! */
+ count <<= 3;
+ curSample += (count >> 3);
+ _outBuffer[j++] = curSample & 0xFF;
+ outSize--;
+ } else {
+ for (; count >= 0; count--) {
+ _outBuffer[j++] = _inBuffer[i++];
+ outSize--;
+ }
+ curSample = _inBuffer[i - 1];
+ }
+ break;
+ case 1:
+ for (; count >= 0; count--) {
+ code = _inBuffer[i++];
+
+ curSample += WSTable4Bit[code & 0x0F];
+ curSample = clip8BitSample(curSample);
+ _outBuffer[j++] = curSample;
+
+ curSample += WSTable4Bit[code >> 4];
+ curSample = clip8BitSample(curSample);
+ _outBuffer[j++] = curSample;
+
+ outSize -= 2;
+ }
+ break;
+ case 0:
+ for (; count >= 0; count--) {
+ code = (uint8)_inBuffer[i++];
+
+ curSample += WSTable2Bit[code & 0x03];
+ curSample = clip8BitSample(curSample);
+ _outBuffer[j++] = curSample & 0xFF;
+
+ curSample += WSTable2Bit[(code >> 2) & 0x03];
+ curSample = clip8BitSample(curSample);
+ _outBuffer[j++] = curSample & 0xFF;
+
+ curSample += WSTable2Bit[(code >> 4) & 0x03];
+ curSample = clip8BitSample(curSample);
+ _outBuffer[j++] = curSample & 0xFF;
+
+ curSample += WSTable2Bit[(code >> 6) & 0x03];
+ curSample = clip8BitSample(curSample);
+ _outBuffer[j++] = curSample & 0xFF;
+
+ outSize -= 4;
+ }
+ break;
+ default:
+ for (; count >= 0; count--) {
+ _outBuffer[j++] = curSample & 0xFF;
+ outSize--;
+ }
+ }
+ }
+ }
+ }
+
+ // copies the chunk data to the output buffer
+ if (_bytesLeft > 0) {
+ int samples = MIN(_bytesLeft, maxSamples);
+ samplesProcessed += samples;
+ _bytesLeft -= samples;
+
+ while (samples--) {
+ int16 sample = (_outBuffer[_outBufferOffset++] << 8) ^ 0x8000;
+
+ *buffer++ = sample;
+ }
+ }
+
+ return samplesProcessed;
+}
+
+bool AUDStream::seek(const Audio::Timestamp &where) {
+ const uint32 seekSample = Audio::convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames();
+
+ _stream->seek(_streamStart);
+ _processedSize = 0;
+ _bytesLeft = 0;
+ _endOfData = false;
+
+ uint32 curSample = 0;
+
+ while (!endOfData()) {
+ uint16 size = _stream->readUint16LE();
+ uint16 outSize = _stream->readUint16LE();
+
+ if (curSample + outSize > seekSample) {
+ _stream->seek(-4, SEEK_CUR);
+
+ uint32 samples = seekSample - curSample;
+ int16 *temp = new int16[samples];
+ assert(temp);
+
+ readChunk(temp, samples);
+ delete[] temp;
+ curSample += samples;
+ break;
+ } else {
+ curSample += outSize;
+ _processedSize += 8 + size;
+ _stream->seek(size + 4, SEEK_CUR);
+ }
+ }
+
+ _endOfData = (_processedSize >= _totalSize);
+
+ return (curSample == seekSample);
+}
+
+Audio::SeekableAudioStream* makeAUDStream(Common::SeekableReadStream* stream, DisposeAfterUse::Flag disposeAfterUse) {
+ return new AUDStream(stream);
+}
+
+} // End of namespace Kyra
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