71 lines
2.3 KiB
Java
71 lines
2.3 KiB
Java
/*
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* Copyright (C) 2013 Adrian Ulrich <adrian@blinkenlights.ch>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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package net.nullsum.audinaut.util.tags;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.charset.StandardCharsets;
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import java.util.HashMap;
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class LameHeader extends Common {
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public LameHeader() {
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}
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public HashMap getTags(RandomAccessFile s) throws IOException {
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return parseLameHeader(s, 0);
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}
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public HashMap parseLameHeader(RandomAccessFile s, long offset) throws IOException {
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HashMap tags = new HashMap();
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byte[] chunk = new byte[4];
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s.seek(offset + 0x24);
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s.read(chunk);
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String lameMark = new String(chunk, 0, chunk.length, StandardCharsets.ISO_8859_1);
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if (lameMark.equals("Info") || lameMark.equals("Xing")) {
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s.seek(offset + 0xAB);
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s.read(chunk);
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int raw = b2be32(chunk, 0);
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int gtrk_raw = raw >> 16; /* first 16 bits are the raw track gain value */
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int galb_raw = raw & 0xFFFF; /* the rest is for the album gain value */
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float gtrk_val = (float) (gtrk_raw & 0x01FF) / 10;
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float galb_val = (float) (galb_raw & 0x01FF) / 10;
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gtrk_val = ((gtrk_raw & 0x0200) != 0 ? -1 * gtrk_val : gtrk_val);
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galb_val = ((galb_raw & 0x0200) != 0 ? -1 * galb_val : galb_val);
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if ((gtrk_raw & 0xE000) == 0x2000) {
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addTagEntry(tags, "REPLAYGAIN_TRACK_GAIN", gtrk_val + " dB");
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}
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if ((gtrk_raw & 0xE000) == 0x4000) {
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addTagEntry(tags, "REPLAYGAIN_ALBUM_GAIN", galb_val + " dB");
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}
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}
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return tags;
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}
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}
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