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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.
*
* $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/engines/draci/barchive.cpp $
* $Id: barchive.cpp 44493 2009-09-30 16:04:21Z fingolfin $
*
*/
#include "common/debug.h"
#include "common/file.h"
#include "common/str.h"
#include "common/stream.h"
#include "draci/sound.h"
#include "draci/draci.h"
namespace Draci {
void SoundArchive::openArchive(const Common::String &path) {
// Close previously opened archive (if any)
closeArchive();
debugCN(2, kDraciArchiverDebugLevel, "Loading samples %s: ", path.c_str());
_f = new Common::File();
_f->open(path);
if (_f->isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Success");
} else {
debugC(2, kDraciArchiverDebugLevel, "Error");
return;
}
// Save path for reading in files later on
_path = path;
// Read archive header
debugC(2, kDraciArchiverDebugLevel, "Loading header");
uint totalLength = _f->readUint32LE();
const uint kMaxSamples = 4095; // The no-sound file is exactly 16K bytes long, so don't fail on short reads
uint sampleStarts[kMaxSamples];
for (uint i = 0; i < kMaxSamples; ++i) {
sampleStarts[i] = _f->readUint32LE();
}
// Fill the sample table
for (_sampleCount = 0; _sampleCount < kMaxSamples - 1; ++_sampleCount) {
int length = sampleStarts[_sampleCount + 1] - sampleStarts[_sampleCount];
if (length <= 0 && sampleStarts[_sampleCount] >= totalLength) // heuristics to detect the last sample
break;
}
if (_sampleCount > 0) {
debugC(2, kDraciArchiverDebugLevel, "Archive info: %d samples, %d total length",
_sampleCount, totalLength);
_samples = new SoundSample[_sampleCount];
for (uint i = 0; i < _sampleCount; ++i) {
_samples[i]._offset = sampleStarts[i];
_samples[i]._length = sampleStarts[i+1] - sampleStarts[i];
_samples[i]._frequency = 0; // set in getSample()
_samples[i]._data = NULL;
}
if (_samples[_sampleCount-1]._offset + _samples[_sampleCount-1]._length != totalLength &&
_samples[_sampleCount-1]._offset + _samples[_sampleCount-1]._length - _samples[0]._offset != totalLength) {
// WORKAROUND: the stored length is stored with the header for sounds and without the hader for dubbing. Crazy.
debugC(2, kDraciArchiverDebugLevel, "Broken sound archive: %d != %d",
_samples[_sampleCount-1]._offset + _samples[_sampleCount-1]._length,
totalLength);
closeArchive();
return;
}
} else {
debugC(2, kDraciArchiverDebugLevel, "Archive info: empty");
}
// Indicate that the archive has been successfully opened
_opened = true;
}
/**
* @brief SoundArchive close method
*
* Closes the currently opened archive. It can be called explicitly to
* free up memory.
*/
void SoundArchive::closeArchive() {
clearCache();
delete _f;
_f = NULL;
delete[] _samples;
_samples = NULL;
_sampleCount = 0;
_path = "";
_opened = false;
}
/**
* Clears the cache of the open files inside the archive without closing it.
* If the files are subsequently accessed, they are read from the disk.
*/
void SoundArchive::clearCache() {
// Delete all cached data
for (uint i = 0; i < _sampleCount; ++i) {
_samples[i].close();
}
}
/**
* @brief On-demand sound sample loader
* @param i Index of file inside an archive
* @return Pointer to a SoundSample coresponding to the opened file or NULL (on failure)
*
* Loads individual samples from an archive to memory on demand.
*/
const SoundSample *SoundArchive::getSample(uint i, uint freq) {
// Check whether requested file exists
if (i >= _sampleCount) {
return NULL;
}
debugCN(2, kDraciArchiverDebugLevel, "Accessing sample %d from archive %s... ",
i, _path.c_str());
// Check if file has already been opened and return that
if (_samples[i]._data) {
debugC(2, kDraciArchiverDebugLevel, "Success");
} else {
// Read in the file (without the file header)
_f->seek(_samples[i]._offset);
_samples[i]._data = new byte[_samples[i]._length];
_f->read(_samples[i]._data, _samples[i]._length);
debugC(3, kDraciArchiverDebugLevel, "Cached sample %d from archive %s",
i, _path.c_str());
}
_samples[i]._frequency = freq;
return _samples + i;
}
} // End of namespace Draci
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