+/***************************************************************************
+ copyright : (C) 2003 by Allan Sandfeld Jensen
+ email : kde@carewolf.org
+ ***************************************************************************/
+
+/***************************************************************************
+ * This library is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU Lesser General Public License version *
+ * 2.1 as published by the Free Software Foundation. *
+ * *
+ * This library 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 *
+ * Lesser General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU Lesser General Public *
+ * License along with this library; if not, write to the Free Software *
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
+ * USA *
+ * *
+ * Alternatively, this file is available under the Mozilla Public *
+ * License Version 1.1. You may obtain a copy of the License at *
+ * http://www.mozilla.org/MPL/ *
+ ***************************************************************************/
+
+#include <tstring.h>
+#include <tdebug.h>
+
+#include "flacproperties.h"
+#include "flacfile.h"
+
+using namespace TagLib;
+
+class FLAC::Properties::PropertiesPrivate
+{
+public:
+ PropertiesPrivate(ByteVector d, long st, ReadStyle s) :
+ data(d),
+ streamLength(st),
+ style(s),
+ length(0),
+ bitrate(0),
+ sampleRate(0),
+ sampleWidth(0),
+ channels(0) {}
+
+ ByteVector data;
+ long streamLength;
+ ReadStyle style;
+ int length;
+ int bitrate;
+ int sampleRate;
+ int sampleWidth;
+ int channels;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// public members
+////////////////////////////////////////////////////////////////////////////////
+
+FLAC::Properties::Properties(ByteVector data, long streamLength, ReadStyle style) : AudioProperties(style)
+{
+ d = new PropertiesPrivate(data, streamLength, style);
+ read();
+}
+
+FLAC::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
+{
+ d = new PropertiesPrivate(file->streamInfoData(), file->streamLength(), style);
+ read();
+}
+
+FLAC::Properties::~Properties()
+{
+ delete d;
+}
+
+int FLAC::Properties::length() const
+{
+ return d->length;
+}
+
+int FLAC::Properties::bitrate() const
+{
+ return d->bitrate;
+}
+
+int FLAC::Properties::sampleRate() const
+{
+ return d->sampleRate;
+}
+
+int FLAC::Properties::sampleWidth() const
+{
+ return d->sampleWidth;
+}
+
+int FLAC::Properties::channels() const
+{
+ return d->channels;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// private members
+////////////////////////////////////////////////////////////////////////////////
+
+void FLAC::Properties::read()
+{
+ if(d->data.size() < 18) {
+ debug("FLAC::Properties::read() - FLAC properties must contain at least 18 bytes.");
+ return;
+ }
+
+ int pos = 0;
+
+ // Minimum block size (in samples)
+ pos += 2;
+
+ // Maximum block size (in samples)
+ pos += 2;
+
+ // Minimum frame size (in bytes)
+ pos += 3;
+
+ // Maximum frame size (in bytes)
+ pos += 3;
+
+ uint flags = d->data.mid(pos, 4).toUInt(true);
+ d->sampleRate = flags >> 12;
+ d->channels = ((flags >> 9) & 7) + 1;
+ d->sampleWidth = ((flags >> 4) & 31) + 1;
+
+ // The last 4 bits are the most significant 4 bits for the 36 bit
+ // stream length in samples. (Audio files measured in days)
+
+ uint highLength =d->sampleRate > 0 ? (((flags & 0xf) << 28) / d->sampleRate) << 4 : 0;
+ pos += 4;
+
+ d->length = d->sampleRate > 0 ?
+ (d->data.mid(pos, 4).toUInt(true)) / d->sampleRate + highLength : 0;
+ pos += 4;
+
+ // Uncompressed bitrate:
+
+ //d->bitrate = ((d->sampleRate * d->channels) / 1000) * d->sampleWidth;
+
+ // Real bitrate:
+
+ d->bitrate = d->length > 0 ? ((d->streamLength * 8UL) / d->length) / 1000 : 0;
+}