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/*
* Copyright (C) 2013 Adrian Ulrich <adrian@blinkenlights.ch>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
package github.daneren2005.dsub.util.tags;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.HashMap;
import java.util.Enumeration;
public class FlacFile extends Common {
private static final int FLAC_TYPE_COMMENT = 4; // ID of 'VorbisComment's
public FlacFile() {
}
public HashMap getTags(RandomAccessFile s) throws IOException {
int xoff = 4; // skip file magic
int retry = 64;
int r[];
HashMap tags = new HashMap();
for(; retry > 0; retry--) {
r = parse_metadata_block(s, xoff);
if(r[2] == FLAC_TYPE_COMMENT) {
tags = parse_vorbis_comment(s, xoff+r[0], r[1]);
break;
}
if(r[3] != 0)
break; // eof reached
// else: calculate next offset
xoff += r[0] + r[1];
}
return tags;
}
/* Parses the metadata block at 'offset' and returns
** [header_size, payload_size, type, stop_after]
*/
private int[] parse_metadata_block(RandomAccessFile s, long offset) throws IOException {
int[] result = new int[4];
byte[] mb_head = new byte[4];
int stop_after = 0;
int block_type = 0;
int block_size = 0;
s.seek(offset);
if( s.read(mb_head) != 4 )
xdie("failed to read metadata block header");
block_size = b2be32(mb_head,0); // read whole header as 32 big endian
block_type = (block_size >> 24) & 127; // BIT 1-7 are the type
stop_after = (((block_size >> 24) & 128) > 0 ? 1 : 0 ); // BIT 0 indicates the last-block flag
block_size = (block_size & 0x00FFFFFF); // byte 1-7 are the size
// debug("size="+block_size+", type="+block_type+", is_last="+stop_after);
result[0] = 4; // hardcoded - only returned to be consistent with OGG parser
result[1] = block_size;
result[2] = block_type;
result[3] = stop_after;
return result;
}
}
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