Commit 42d6c16c authored by Sébastien Toque's avatar Sébastien Toque

Store covers in a cache on the sdcard for faster loading

parent 2f7ab538
package org.videolan.vlc;
/** Murmur hash 2.0.
*
* The murmur hash is a relative fast hash function from
* http://murmurhash.googlepages.com/ for platforms with efficient
* multiplication.
*
* This is a re-implementation of the original C code plus some
* additional features.
*
* Public domain.
*
* @author Viliam Holub
* @version 1.0.2
*
*/
public final class MurmurHash {
/** Generates 32 bit hash from byte array of the given length and
* seed.
*
* @param data byte array to hash
* @param length length of the array to hash
* @param seed initial seed value
* @return 32 bit hash of the given array
*/
public static int hash32(final byte[] data, int length, int seed) {
// 'm' and 'r' are mixing constants generated offline.
// They're not really 'magic', they just happen to work well.
final int m = 0x5bd1e995;
final int r = 24;
// Initialize the hash to a random value
int h = seed ^ length;
int length4 = length / 4;
for (int i = 0; i < length4; i++) {
final int i4 = i * 4;
int k = (data[i4 + 0] & 0xff) + ((data[i4 + 1] & 0xff) << 8)
+ ((data[i4 + 2] & 0xff) << 16) + ((data[i4 + 3] & 0xff) << 24);
k *= m;
k ^= k >>> r;
k *= m;
h *= m;
h ^= k;
}
// Handle the last few bytes of the input array
switch (length % 4) {
case 3:
h ^= (data[(length & ~3) + 2] & 0xff) << 16;
case 2:
h ^= (data[(length & ~3) + 1] & 0xff) << 8;
case 1:
h ^= (data[length & ~3] & 0xff);
h *= m;
}
h ^= h >>> 13;
h *= m;
h ^= h >>> 15;
return h;
}
/** Generates 32 bit hash from byte array with default seed value.
*
* @param data byte array to hash
* @param length length of the array to hash
* @return 32 bit hash of the given array
*/
public static int hash32(final byte[] data, int length) {
return hash32(data, length, 0x9747b28c);
}
/** Generates 32 bit hash from a string.
*
* @param text string to hash
* @return 32 bit hash of the given string
*/
public static int hash32(final String text) {
final byte[] bytes = text.getBytes();
return hash32(bytes, bytes.length);
}
/** Generates 32 bit hash from a substring.
*
* @param text string to hash
* @param from starting index
* @param length length of the substring to hash
* @return 32 bit hash of the given string
*/
public static int hash32(final String text, int from, int length) {
return hash32(text.substring(from, from + length));
}
/** Generates 64 bit hash from byte array of the given length and seed.
*
* @param data byte array to hash
* @param length length of the array to hash
* @param seed initial seed value
* @return 64 bit hash of the given array
*/
public static long hash64(final byte[] data, int length, int seed) {
final long m = 0xc6a4a7935bd1e995L;
final int r = 47;
long h = (seed & 0xffffffffl) ^ (length * m);
int length8 = length / 8;
for (int i = 0; i < length8; i++) {
final int i8 = i * 8;
long k = ((long) data[i8 + 0] & 0xff) + (((long) data[i8 + 1] & 0xff) << 8)
+ (((long) data[i8 + 2] & 0xff) << 16) + (((long) data[i8 + 3] & 0xff) << 24)
+ (((long) data[i8 + 4] & 0xff) << 32) + (((long) data[i8 + 5] & 0xff) << 40)
+ (((long) data[i8 + 6] & 0xff) << 48) + (((long) data[i8 + 7] & 0xff) << 56);
k *= m;
k ^= k >>> r;
k *= m;
h ^= k;
h *= m;
}
switch (length % 8) {
case 7:
h ^= (long) (data[(length & ~7) + 6] & 0xff) << 48;
case 6:
h ^= (long) (data[(length & ~7) + 5] & 0xff) << 40;
case 5:
h ^= (long) (data[(length & ~7) + 4] & 0xff) << 32;
case 4:
h ^= (long) (data[(length & ~7) + 3] & 0xff) << 24;
case 3:
h ^= (long) (data[(length & ~7) + 2] & 0xff) << 16;
case 2:
h ^= (long) (data[(length & ~7) + 1] & 0xff) << 8;
case 1:
h ^= (long) (data[length & ~7] & 0xff);
h *= m;
}
;
h ^= h >>> r;
h *= m;
h ^= h >>> r;
return h;
}
/** Generates 64 bit hash from byte array with default seed value.
*
* @param data byte array to hash
* @param length length of the array to hash
* @return 64 bit hash of the given string
*/
public static long hash64(final byte[] data, int length) {
return hash64(data, length, 0xe17a1465);
}
/** Generates 64 bit hash from a string.
*
* @param text string to hash
* @return 64 bit hash of the given string
*/
public static long hash64(final String text) {
final byte[] bytes = text.getBytes();
return hash64(bytes, bytes.length);
}
/** Generates 64 bit hash from a substring.
*
* @param text string to hash
* @param from starting index
* @param length length of the substring to hash
* @return 64 bit hash of the given array
*/
public static long hash64(final String text, int from, int length) {
return hash64(text.substring(from, from + length));
}
}
......@@ -19,13 +19,18 @@
*****************************************************************************/
package org.videolan.vlc.gui.audio;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.videolan.vlc.Media;
import org.videolan.vlc.MurmurHash;
import org.videolan.vlc.R;
import org.videolan.vlc.Util;
import org.videolan.vlc.VLCApplication;
......@@ -37,13 +42,17 @@ import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.media.RingtoneManager;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Log;
public class AudioUtil {
public final static String TAG = "VLC/AudioUtil";
public static void setRingtone( Media song, Activity activity){
File newringtone = Util.URItoFile(song.getLocation());
ContentValues values = new ContentValues();
......@@ -138,9 +147,20 @@ public class AudioUtil {
return null;
}
public static Bitmap getCover(Context context, Media media, int width) {
@SuppressLint("SdCardPath")
public synchronized static Bitmap getCover(Context context, Media media, int width) {
Bitmap cover = null;
String cachePath = null;
try {
// try to load from cache
int hash = MurmurHash.hash32(media.getArtist()+media.getAlbum());
cachePath = "/sdcard/Android/data/org.videolan.vlc/cache/covers/" +
(hash >= 0 ? "" + hash : "m" + (-hash)) + "_" + width;
cover = readBitmap(cachePath);
if (cover != null)
return cover;
// try to get the cover from android MediaStore
cover = getCoverFromMediaStore(context, media);
......@@ -155,8 +175,35 @@ public class AudioUtil {
//scale down if requested
if (cover != null && width > 0)
cover = Util.scaleDownBitmap(context, cover, width);
//store cover into cache
if (cover != null)
writeBitmap(cover, cachePath);
} catch (Exception e) {
e.printStackTrace();
}
return cover;
}
private static void writeBitmap(Bitmap bitmap, String path) throws IOException {
OutputStream out = null;
try {
File file = new File(path);
out = new BufferedOutputStream(new FileOutputStream(file), 4096);
bitmap.compress(CompressFormat.JPEG, 90, out);
} catch (Exception e) {
Log.e(TAG, "writeBitmap failed : "+ e.getMessage());
} finally {
if (out != null) {
out.close();
}
}
}
private static Bitmap readBitmap(String path) {
File file = new File(path);
if (file == null || !file.exists()) return null;
return BitmapFactory.decodeFile(path);
}
}
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