diff options
Diffstat (limited to 'engines/zvision/zork_raw.cpp')
-rw-r--r-- | engines/zvision/zork_raw.cpp | 376 |
1 files changed, 188 insertions, 188 deletions
diff --git a/engines/zvision/zork_raw.cpp b/engines/zvision/zork_raw.cpp index e008741e16..d920550bc7 100644 --- a/engines/zvision/zork_raw.cpp +++ b/engines/zvision/zork_raw.cpp @@ -1,188 +1,188 @@ -/* 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 "common/scummsys.h"
-
-#include "common/endian.h"
-#include "common/memstream.h"
-#include "common/textconsole.h"
-#include "common/util.h"
-
-#include "audio/audiostream.h"
-
-#include "engines/zvision/zork_raw.h"
-
-namespace ZVision {
-
-#pragma mark -
-#pragma mark --- RawZorkStream ---
-#pragma mark -
-
-/**
- * This is a stream, which allows for playing raw PCM data from a stream.
- */
-class RawZorkStream : public Audio::SeekableAudioStream {
-public:
- RawZorkStream(int rate, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream)
- : _rate(rate), _playtime(0, rate), _stream(stream, disposeStream), _endOfData(false), _buffer(0) {
- // Setup our buffer for readBuffer
- _buffer = new byte[kSampleBufferLength];
- assert(_buffer);
-
- // Calculate the total playtime of the stream
- _playtime = Audio::Timestamp(0, _stream->size() / 2 / 1, rate);
- }
-
- ~RawZorkStream() {
- delete[] _buffer;
- }
-
- int readBuffer(int16 *buffer, const int numSamples);
-
- bool isStereo() const { return true; }
- bool endOfData() const { return _endOfData; }
-
- int getRate() const { return _rate; }
- Audio::Timestamp getLength() const { return _playtime; }
-
- bool seek(const Audio::Timestamp &where);
-private:
- const int _rate; ///< Sample rate of stream
- Audio::Timestamp _playtime; ///< Calculated total play time
- Common::DisposablePtr<Common::SeekableReadStream> _stream; ///< Stream to read data from
- bool _endOfData; ///< Whether the stream end has been reached
-
- byte *_buffer; ///< Buffer used in readBuffer
- enum {
- /**
- * How many samples we can buffer at once.
- *
- * TODO: Check whether this size suffices
- * for systems with slow disk I/O.
- */
- kSampleBufferLength = 2048
- };
-
- /**
- * Fill the temporary sample buffer used in readBuffer.
- *
- * @param maxSamples Maximum samples to read.
- * @return actual count of samples read.
- */
- int fillBuffer(int maxSamples);
-};
-
-int RawZorkStream::readBuffer(int16 *buffer, const int numSamples) {
- int samplesLeft = numSamples;
-
- while (samplesLeft > 0) {
- // Try to read up to "samplesLeft" samples.
- int len = fillBuffer(samplesLeft);
-
- // In case we were not able to read any samples
- // we will stop reading here.
- if (!len)
- break;
-
- // Adjust the samples left to read.
- samplesLeft -= len;
-
- // Copy the data to the caller's buffer.
- const byte *src = _buffer;
- while (len-- > 0) {
- if (*src < 128)
- *buffer++ = ((128 - *src) << 8) ^ 0x8000;
- else
- *buffer++ = (*src << 8) ^ 0x8000;
- src++;
- }
- }
-
- return numSamples - samplesLeft;
-}
-
-int RawZorkStream::fillBuffer(int maxSamples) {
- int bufferedSamples = 0;
- byte *dst = _buffer;
-
- // We can only read up to "kSampleBufferLength" samples
- // so we take this into consideration, when trying to
- // read up to maxSamples.
- maxSamples = MIN<int>(kSampleBufferLength, maxSamples);
-
- // We will only read up to maxSamples
- while (maxSamples > 0 && !endOfData()) {
- // Try to read all the sample data and update the
- // destination pointer.
- const int bytesRead = _stream->read(dst, maxSamples);
- dst += bytesRead;
-
- // Calculate how many samples we actually read.
- const int samplesRead = bytesRead;
-
- // Update all status variables
- bufferedSamples += samplesRead;
- maxSamples -= samplesRead;
-
- // We stop stream playback, when we reached the end of the data stream.
- // We also stop playback when an error occures.
- if (_stream->pos() == _stream->size() || _stream->err() || _stream->eos())
- _endOfData = true;
- }
-
- return bufferedSamples;
-}
-
-bool RawZorkStream::seek(const Audio::Timestamp &where) {
- _endOfData = true;
-
- if (where > _playtime)
- return false;
-
- const uint32 seekSample = convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames();
- _stream->seek(seekSample, SEEK_SET);
-
- // In case of an error we will not continue stream playback.
- if (!_stream->err() && !_stream->eos() && _stream->pos() != _stream->size())
- _endOfData = false;
-
- return true;
-}
-
-#pragma mark -
-#pragma mark --- Raw stream factories ---
-#pragma mark -
-
-Audio::SeekableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream,
- int rate,
- DisposeAfterUse::Flag disposeAfterUse) {
- assert(stream->size() % 2 == 0);
- return new RawZorkStream(rate, disposeAfterUse, stream);
-}
-
-Audio::SeekableAudioStream *makeRawZorkStream(const byte *buffer, uint32 size,
- int rate,
- DisposeAfterUse::Flag disposeAfterUse) {
- return makeRawZorkStream(new Common::MemoryReadStream(buffer, size, disposeAfterUse), rate, DisposeAfterUse::YES);
-}
-
-} // End of namespace ZVision
+/* 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 "common/scummsys.h" + +#include "common/endian.h" +#include "common/memstream.h" +#include "common/textconsole.h" +#include "common/util.h" + +#include "audio/audiostream.h" + +#include "engines/zvision/zork_raw.h" + +namespace ZVision { + +#pragma mark - +#pragma mark --- RawZorkStream --- +#pragma mark - + +/** + * This is a stream, which allows for playing raw PCM data from a stream. + */ +class RawZorkStream : public Audio::SeekableAudioStream { +public: + RawZorkStream(int rate, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream) + : _rate(rate), _playtime(0, rate), _stream(stream, disposeStream), _endOfData(false), _buffer(0) { + // Setup our buffer for readBuffer + _buffer = new byte[kSampleBufferLength]; + assert(_buffer); + + // Calculate the total playtime of the stream + _playtime = Audio::Timestamp(0, _stream->size() / 2 / 1, rate); + } + + ~RawZorkStream() { + delete[] _buffer; + } + + int readBuffer(int16 *buffer, const int numSamples); + + bool isStereo() const { return true; } + bool endOfData() const { return _endOfData; } + + int getRate() const { return _rate; } + Audio::Timestamp getLength() const { return _playtime; } + + bool seek(const Audio::Timestamp &where); +private: + const int _rate; ///< Sample rate of stream + Audio::Timestamp _playtime; ///< Calculated total play time + Common::DisposablePtr<Common::SeekableReadStream> _stream; ///< Stream to read data from + bool _endOfData; ///< Whether the stream end has been reached + + byte *_buffer; ///< Buffer used in readBuffer + enum { + /** + * How many samples we can buffer at once. + * + * TODO: Check whether this size suffices + * for systems with slow disk I/O. + */ + kSampleBufferLength = 2048 + }; + + /** + * Fill the temporary sample buffer used in readBuffer. + * + * @param maxSamples Maximum samples to read. + * @return actual count of samples read. + */ + int fillBuffer(int maxSamples); +}; + +int RawZorkStream::readBuffer(int16 *buffer, const int numSamples) { + int samplesLeft = numSamples; + + while (samplesLeft > 0) { + // Try to read up to "samplesLeft" samples. + int len = fillBuffer(samplesLeft); + + // In case we were not able to read any samples + // we will stop reading here. + if (!len) + break; + + // Adjust the samples left to read. + samplesLeft -= len; + + // Copy the data to the caller's buffer. + const byte *src = _buffer; + while (len-- > 0) { + if (*src < 128) + *buffer++ = ((128 - *src) << 8) ^ 0x8000; + else + *buffer++ = (*src << 8) ^ 0x8000; + src++; + } + } + + return numSamples - samplesLeft; +} + +int RawZorkStream::fillBuffer(int maxSamples) { + int bufferedSamples = 0; + byte *dst = _buffer; + + // We can only read up to "kSampleBufferLength" samples + // so we take this into consideration, when trying to + // read up to maxSamples. + maxSamples = MIN<int>(kSampleBufferLength, maxSamples); + + // We will only read up to maxSamples + while (maxSamples > 0 && !endOfData()) { + // Try to read all the sample data and update the + // destination pointer. + const int bytesRead = _stream->read(dst, maxSamples); + dst += bytesRead; + + // Calculate how many samples we actually read. + const int samplesRead = bytesRead; + + // Update all status variables + bufferedSamples += samplesRead; + maxSamples -= samplesRead; + + // We stop stream playback, when we reached the end of the data stream. + // We also stop playback when an error occures. + if (_stream->pos() == _stream->size() || _stream->err() || _stream->eos()) + _endOfData = true; + } + + return bufferedSamples; +} + +bool RawZorkStream::seek(const Audio::Timestamp &where) { + _endOfData = true; + + if (where > _playtime) + return false; + + const uint32 seekSample = convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames(); + _stream->seek(seekSample, SEEK_SET); + + // In case of an error we will not continue stream playback. + if (!_stream->err() && !_stream->eos() && _stream->pos() != _stream->size()) + _endOfData = false; + + return true; +} + +#pragma mark - +#pragma mark --- Raw stream factories --- +#pragma mark - + +Audio::SeekableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream, + int rate, + DisposeAfterUse::Flag disposeAfterUse) { + assert(stream->size() % 2 == 0); + return new RawZorkStream(rate, disposeAfterUse, stream); +} + +Audio::SeekableAudioStream *makeRawZorkStream(const byte *buffer, uint32 size, + int rate, + DisposeAfterUse::Flag disposeAfterUse) { + return makeRawZorkStream(new Common::MemoryReadStream(buffer, size, disposeAfterUse), rate, DisposeAfterUse::YES); +} + +} // End of namespace ZVision |