Android Open Source - vanilindy Flac File

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 Adrian Ulrich <adrian@blinkenlights.ch>
 */*from   w w  w.j a  v a 2s . co  m*/
 * 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 ch.blinkenlights.bastp;

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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