Android Open Source - unmp Media Information

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Back to project page unmp.

License

The source code is released under:

MIT License

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Java Source Code

package com.parnswir.unmp.media;
//  w w  w .  j  a  v  a2s. c  o  m
import java.math.BigInteger;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.jaudiotagger.audio.mp3.MP3File;
import org.jaudiotagger.tag.FieldKey;
import org.jaudiotagger.tag.Tag;
import org.jaudiotagger.tag.images.Artwork;

import com.parnswir.unmp.core.C;
import com.parnswir.unmp.core.DatabaseUtils;

import android.content.ContentValues;

public class MediaInformation {
  
  private HashMap<String, Object> extractedTags;
  private static Pattern genrePattern = Pattern.compile("(\\d+)");
  
  public MediaInformation(MP3File f) {
    Tag tag = f.getTag();
    extractedTags = new HashMap<String, Object>();
    
    extractBasicInfo(tag);    
    extractArtwork(tag);
    extractFileInfo(f);
  }

  private void extractBasicInfo(Tag tag) {
    for (int i = 0; i < C.FIELDS.length; i++) { 
      String name = C.FIELDNAMES[i];
      FieldKey key = C.FIELDS[i];
      
      String extractedValue = tag.getFirst(key);
      extractedTags.put(name, extractedValue);
    }
    if (extractedTags.containsKey(C.COL_GENRE))
      correctGenre();
    if (extractedTags.containsKey(C.COL_RATING))
      correctRating();
  }

  private void extractArtwork(Tag tag) {
    Artwork artwork = tag.getFirstArtwork();
    String artType = C.ALBUM_ART_FOLDER;
    if (artwork != null) {
      artType = C.ALBUM_ART_BLOB;
      extractedTags.put(C.COL_IMAGE_BLOB, artwork.getBinaryData());
      extractedTags.put(C.COL_IMAGE_HASH, Integer.toString(new BigInteger(artwork.getBinaryData()).hashCode()));
    }
    extractedTags.put(C.COL_IMAGE_TYPE, artType);
  }
  
  private void extractFileInfo(MP3File f) {
    extractedTags.put(C.COL_LENGTH, Integer.toString(f.getAudioHeader().getTrackLength()));
    extractedTags.put(C.COL_BIT_RATE, f.getAudioHeader().getBitRate());
    extractedTags.put(C.COL_FILE, DatabaseUtils.normalize(f.getFile().getAbsolutePath()));
  }
  
  private void correctGenre() {
    Matcher m = genrePattern.matcher((String) extractedTags.get(C.COL_GENRE));
    if (m.find()) {
      extractedTags.put(C.COL_GENRE, C.GENRE_IDS.get(m.group(1)));
    }
  }
  
  private void correctRating() {
    int rating = 0;
    try {
      rating = Integer.decode((String) extractedTags.get(C.COL_RATING));
      if (rating > 0)
        rating = (rating + 1) / 32 + 2; // 255 = 5 stars, 192 = 4 stars, ...
      
    } catch (NumberFormatException e) {
    } finally {
      extractedTags.put(C.COL_RATING, Integer.toString(rating));
    }
  }

  public ContentValues toContentValuesForTable(String tableName) {
    ContentValues result = new ContentValues();
    String[] columnNames = C.COLUMNS.get(tableName);
    for (int i = 0; i < columnNames.length; i++) {
      String name = columnNames[i];
      Object tag = extractedTags.get(name);
      if (name.equals(C.COL_IMAGE_BLOB)) {
        result.put(name, (byte[]) tag);
      } else {
        result.put(name, (String) tag);
      }
    }
    return result;
  }

}

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